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https://github.com/gnss-sdr/gnss-sdr
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SBAS-telemetry decoder matlab file+code organization
This commit is contained in:
juanalfarom
parent
15caa7fd89
commit
7adcd86c99
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@ -196,7 +196,7 @@ dll_pll_veml_tracking::dll_pll_veml_tracking(const Dll_Pll_Conf &conf_)
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// set the bit transition pattern in secondary code to obtain bit synchronization
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// set the bit transition pattern in secondary code to obtain bit synchronization
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d_secondary_code_length = static_cast<uint32_t>(GPS_CA_PREAMBLE_LENGTH_SYMBOLS);
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d_secondary_code_length = static_cast<uint32_t>(GPS_CA_PREAMBLE_LENGTH_SYMBOLS);
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d_secondary_code_string = GPS_CA_PREAMBLE_SYMBOLS_STR;
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d_secondary_code_string = GPS_CA_PREAMBLE_SYMBOLS_STR;
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d_symbols_per_bit = 1;//GPS_CA_TELEMETRY_SYMBOLS_PER_BIT;
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d_symbols_per_bit = GPS_CA_TELEMETRY_SYMBOLS_PER_BIT;
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}
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}
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else if (d_signal_type == "2S")
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else if (d_signal_type == "2S")
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{
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{
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@ -1932,11 +1932,6 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
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d_state = 4;
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d_state = 4;
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}
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}
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}
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}
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// SBAS addons
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current_synchro_data = *d_acquisition_gnss_synchro;
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current_synchro_data.Prompt_I = d_Prompt->real();
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current_synchro_data.Prompt_Q = d_Prompt->imag();
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current_synchro_data.Flag_valid_symbol_output = true;
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}
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}
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break;
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break;
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}
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}
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506
src/utils/matlab/SBAS_decoder.m
Normal file
506
src/utils/matlab/SBAS_decoder.m
Normal file
@ -0,0 +1,506 @@
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clear; clc;
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% This program decodes the navigation bits obtained from the telemetry
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% block for SBAS. The only input required is the filename of the .mat with
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% the telemetry output.
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%
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% The message types available for decoding are: 0, 17, 18, 26 and 27.
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%
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% Written by Juan Alfaro
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filename = ''; % Path to the telemetry .mat output file.
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load(filename)
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% SBAS preamble types
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preamble1 = '01010011';
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preamble2 = '10011010';
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preamble3 = '11000110';
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% Prepare the incoming bit data for the program
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bitLog = nav_symbol == 1;
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preLog1 = preamble1 == '1';
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preLog2 = preamble2 == '1';
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preLog3 = preamble3 == '1';
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preLen = length(preamble1);
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preStart = 0;
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counter = 0;
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% Main Loop
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for i=1:(length(nav_symbol) - preLen + 1)
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if all(bitLog(i:i + preLen -1) == preLog1) || all(bitLog(i:i + preLen -1) == preLog2) || all(bitLog(i:i + preLen -1) == preLog3)
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if (i+249 <= length(nav_symbol))
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preStart = i;
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binMsg = strcat(strjoin(cellstr(char(nav_symbol(preStart:preStart+249) + '0')'),''),'000000');
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check = paritycheck(binMsg);
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if check == 1
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counter = counter +1;
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hex = convert2hex(binMsg)
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data{counter} = hex;
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preamble = dec2hex(bin2dec(binMsg(1:8))); % Preamble bits 0-7
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msgType = bin2dec(binMsg(9:14)); % Message type bits 8-13
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if msgType == 0
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disp('Message type 0: don`t use for safety applications (for WAAS testing)'); NavData = MT0(binMsg,preamble);
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elseif msgType == 17
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disp('Message type 17: satellite almanacs'); NavData = MT17(binMsg,preamble);
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elseif msgType == 18
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disp('Message type 18: Ionospheric grid point mask'); NavData = MT18(binMsg,preamble);
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elseif msgType == 26
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disp('Message type 26: Ionospheric delay corrections'); NavData = MT26(binMsg,preamble);
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elseif msgType == 27
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disp('Message type 27: WAAS Service Message'); NavData = MT27(binMsg,preamble);
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else
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fprintf('Message type %d not supported! \n', msgType);
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end
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end
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end
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end
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end
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fprintf('There were found a total of %d messages in %d bits of data. \n', counter, length(nav_symbol))
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% Functions
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function check = paritycheck(binMsg)
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if strcmp(crc24q(binMsg),'000000000000000000000000') && strcmp(binMsg(251:256),'000000')% Check CRC-24 of message (parity)
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disp('CRC-24 parity valid!');
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check = 1;
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else
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disp('CRC-24 parity not valid, error!');
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check = 0;
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end
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end
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function NavData = MT0(binMsg,preamble)
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NavData.dataID(1) = bin2dec(binMsg(15:16)); % Data ID bits 14-15 (satellite 1)
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NavData.dataID(2) = bin2dec(binMsg(82:83)); % Data ID bits 81-82 (satellite 2)
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NavData.dataID(3) = bin2dec(binMsg(149:150)); % Data ID bits 148-149 (satellite 3)
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%NavData.parity = bin2dec(binMsg(1:250));
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fprintf('Preamble: %s \n',preamble)
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fprintf('Parity: %d \n',0)
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fprintf('Data ID sat. 1: %d \n', NavData.dataID(1));
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fprintf('Data ID sat. 2: %d \n', NavData.dataID(2));
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fprintf('Data ID sat. 3: %d \n', NavData.dataID(3));
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end
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function NavData = MT17(binMsg,preamble)
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NavData.dataID(1) = bin2dec(binMsg(15:16)); % Data ID bits 14-15 (satellite 1)
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NavData.dataID(2) = bin2dec(binMsg(82:83)); % Data ID bits 81-82 (satellite 2)
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NavData.dataID(3) = bin2dec(binMsg(149:150)); % Data ID bits 148-149 (satellite 3)
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NavData.PRN(1) = bin2dec(binMsg(17:24)); % PRN bits 16-23 (satellite 1)
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NavData.PRN(2) = bin2dec(binMsg(84:91)); % PRN bits 83-90 (satellite 2)
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NavData.PRN(3) = bin2dec(binMsg(151:158)); % PRN bits 150-157 (satellite 3)
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NavData.ranging(1) = bin2dec(binMsg(32:32)); % Ranging bits 31-31 (satellite 1)
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NavData.ranging(2) = bin2dec(binMsg(99:99)); % Ranging bits 98-98 (satellite 2)
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NavData.ranging(3) = bin2dec(binMsg(166:166)); % Ranging bits 165-165 (satellite 3)
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NavData.corrections(1) = bin2dec(binMsg(31:31)); % Corrections bits 30-30 (satellite 1)
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NavData.corrections(2) = bin2dec(binMsg(98:98)); % Corrections bits 97-97 (satellite 2)
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NavData.corrections(3) = bin2dec(binMsg(165:165)); % Corrections bits 164-164 (satellite 3)
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NavData.broadInteg(1) = bin2dec(binMsg(30:30)); % Broadcast integrity bits 29-29 (satellite 1)
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NavData.broadInteg(2) = bin2dec(binMsg(97:97)); % Broadcast integrity bits 96-96 (satellite 2)
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NavData.broadInteg(3) = bin2dec(binMsg(164:164)); % Broadcast integrity bits 163-163 (satellite 3)
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NavData.ServProvID(1) = bin2dec(binMsg(25:28)); % Service provider ID bits 24-27 (satellite 1)
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NavData.ServProvID(2) = bin2dec(binMsg(92:95)); % Service provider ID bits 91-94 (satellite 2)
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NavData.ServProvID(3) = bin2dec(binMsg(159:162)); % Service provider ID bits 158-161 (satellite 3)
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if binMsg(33) == '0'
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NavData.Xg(1) = bin2dec(binMsg(33:47))*2600; % Xg ECEF (m) bits 32-46 (satellite 1)
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else
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NavData.Xg(1) = (bin2dec(binMsg(33:47))-2^15)*2600;
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end
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if binMsg(100) == '0'
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NavData.Xg(2) = bin2dec(binMsg(100:114))*2600; % Xg ECEF (m) bits 99-113 (satellite 2)
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else
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NavData.Xg(2) = (bin2dec(binMsg(100:114))-2^15)*2600;
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end
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if binMsg(167) == '0'
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NavData.Xg(3) = bin2dec(binMsg(167:181))*2600; % Xg ECEF (m) bits 166-180 (satellite 3)
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else
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NavData.Xg(3) = (bin2dec(binMsg(167:181))-2^15)*2600;
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end
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if binMsg(48) == '0'
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NavData.Yg(1) = bin2dec(binMsg(48:62))*2600; % Yg ECEF (m) bits 47-61 (satellite 1)
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else
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NavData.Yg(1) = (bin2dec(binMsg(48:62))-2^15)*2600;
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end
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if binMsg(115) == '0'
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NavData.Yg(2) = bin2dec(binMsg(115:129))*2600; % Yg ECEF (m) bits 114-128 (satellite 2)
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else
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NavData.Yg(2) = (bin2dec(binMsg(115:129))-2^15)*2600;
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end
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if binMsg(182) == '0'
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NavData.Yg(3) = bin2dec(binMsg(182:196))*2600; % Yg ECEF (m) bits 181-197 (satellite 3)
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else
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NavData.Yg(3) = (bin2dec(binMsg(182:196))-2^15)*2600;
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end
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if binMsg(63) == '0'
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NavData.Zg(1) = bin2dec(binMsg(63:71))*26000; % Zg ECEF (m) bits 62-70 (satellite 1)
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else
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NavData.Zg(1) = (bin2dec(binMsg(63:71))-2^9)*26000;
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end
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if binMsg(130) == '0'
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NavData.Zg(2) = bin2dec(binMsg(130:138))*26000; % Zg ECEF (m) bits 129-137 (satellite 2)
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else
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NavData.Zg(2) = (bin2dec(binMsg(130:138))-2^9)*26000;
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end
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if binMsg(197) == '0'
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NavData.Zg(3) = bin2dec(binMsg(197:205))*26000; % Zg ECEF (m) bits 196-204 (satellite 3)
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else
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NavData.Zg(3) = (bin2dec(binMsg(197:205))-2^9)*26000;
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end
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if binMsg(72) == '0'
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NavData.Delta_Xg(1) = bin2dec(binMsg(72:74))*10; % Rate of change Xg (m/s) bits 71-73 (satellite 1)
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else
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NavData.Delta_Xg(1) = (bin2dec(binMsg(72:74))-2^3)*10;
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end
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if binMsg(139) == '0'
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NavData.Delta_Xg(2) = bin2dec(binMsg(139:141))*10; % Rate of change Xg (m/s) bits 138-140 (satellite 2)
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else
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NavData.Delta_Xg(2) = (bin2dec(binMsg(139:141))-2^3)*10;
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end
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if binMsg(206) == '0'
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NavData.Delta_Xg(3) = bin2dec(binMsg(206:208))*10; % Rate of change Xg (m/s) bits 205-207 (satellite 3)
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else
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NavData.Delta_Xg(3) = (bin2dec(binMsg(206:208))-2^3)*10;
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end
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if binMsg(75) == '0'
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NavData.Delta_Yg(1) = bin2dec(binMsg(75:77))*10; % Rate of change Yg (m/s) bits 74-76 (satellite 1)
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else
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NavData.Delta_Yg(1) = (bin2dec(binMsg(75:77))-2^3)*10;
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end
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if binMsg(142) == '0'
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NavData.Delta_Yg(2) = bin2dec(binMsg(142:144))*10; % Rate of change Yg (m/s) bits 141-143 (satellite 2)
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else
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NavData.Delta_Yg(2) = (bin2dec(binMsg(142:144))-2^3)*10;
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end
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if binMsg(209) == '0'
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NavData.Delta_Yg(3) = bin2dec(binMsg(209:211))*10; % Rate of change Yg (m/s) bits 208-210 (satellite 3)
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else
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NavData.Delta_Yg(3) = (bin2dec(binMsg(209:211))-2^3)*10;
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end
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if binMsg(78) == '0'
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NavData.Delta_Zg(1) = bin2dec(binMsg(78:81))*60; % Rate of change Zg (m/s) bits 77-80 (satellite 1)
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else
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NavData.Delta_Zg(1) = (bin2dec(binMsg(78:81))-2^4)*60;
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end
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if binMsg(145) == '0'
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NavData.Delta_Zg(2) = bin2dec(binMsg(145:148))*60; % Rate of change Zg (m/s) bits 144-147 (satellite 2)
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else
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NavData.Delta_Zg(2) = (bin2dec(binMsg(145:148))-2^4)*60;
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end
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if binMsg(212) == '0'
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NavData.Delta_Zg(3) = bin2dec(binMsg(212:215))*60; % Rate of change Zg (m/s) bits 211-214 (satellite 3)
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else
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NavData.Delta_Zg(3) = (bin2dec(binMsg(212:215))-2^4)*60;
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end
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NavData.t0 = bin2dec(binMsg(216:226))*64; % Time of day (s) bits 215-225
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%NavData.parity = bin2dec(binMsg(1:250));
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fprintf('Preamble: %s \n',preamble)
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fprintf('Time of the day: %d s \n',NavData.t0);
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fprintf('Parity: %d \n',0)
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disp('-----------------------------------')
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disp('Satellite [ 1 ]')
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fprintf('PRN number: %d \n', NavData.PRN(1));
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fprintf('Data ID: %d \n', NavData.dataID(1));
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fprintf('Ranging: %d \n',NavData.ranging(1))
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fprintf('Corrections: %d \n', NavData.corrections(1));
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fprintf('Broadcast integrity: %d \n', NavData.broadInteg(1));
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fprintf('Service provider ID: %d \n', NavData.ServProvID(1));
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fprintf('Xg (ECEF): %d m \n',NavData.Xg(1));
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fprintf('Yg (ECEF): %d m \n',NavData.Yg(1));
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fprintf('Zg (ECEF): %d m \n',NavData.Zg(1));
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fprintf('Xg rate-of-change: %d m/s \n',NavData.Delta_Xg(1));
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fprintf('Yg rate-of-change: %d m/s \n',NavData.Delta_Yg(1));
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fprintf('Zg rate-of-change: %d m/s \n',NavData.Delta_Zg(1));
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disp('-----------------------------------')
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disp('Satellite [ 2 ]')
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fprintf('PRN number: %d \n', NavData.PRN(2));
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fprintf('Data ID: %d \n', NavData.dataID(2));
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fprintf('Ranging: %d \n',NavData.ranging(2))
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fprintf('Corrections: %d \n', NavData.corrections(2));
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fprintf('Broadcast integrity: %d \n', NavData.broadInteg(2));
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fprintf('Service provider ID: %d \n', NavData.ServProvID(2));
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fprintf('Xg (ECEF): %d m \n',NavData.Xg(2));
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fprintf('Yg (ECEF): %d m \n',NavData.Yg(2));
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fprintf('Zg (ECEF): %d m \n',NavData.Zg(2));
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fprintf('Xg rate-of-change: %d m/s \n',NavData.Delta_Xg(2));
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fprintf('Yg rate-of-change: %d m/s \n',NavData.Delta_Yg(2));
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fprintf('Zg rate-of-change: %d m/s \n',NavData.Delta_Zg(2));
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disp('-----------------------------------')
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disp('Satellite [ 3 ]')
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fprintf('PRN number: %d \n', NavData.PRN(3));
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fprintf('Data ID: %d \n', NavData.dataID(3));
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fprintf('Ranging: %d \n',NavData.ranging(3))
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fprintf('Corrections: %d \n', NavData.corrections(3));
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fprintf('Broadcast integrity: %d \n', NavData.broadInteg(3));
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fprintf('Service provider ID: %d \n', NavData.ServProvID(3));
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||||||
|
fprintf('Xg (ECEF): %d m \n',NavData.Xg(3));
|
||||||
|
fprintf('Yg (ECEF): %d m \n',NavData.Yg(3));
|
||||||
|
fprintf('Zg (ECEF): %d m \n',NavData.Zg(3));
|
||||||
|
|
||||||
|
fprintf('Xg rate-of-change: %d m/s \n',NavData.Delta_Xg(3));
|
||||||
|
fprintf('Yg rate-of-change: %d m/s \n',NavData.Delta_Yg(3));
|
||||||
|
fprintf('Zg rate-of-change: %d m/s \n',NavData.Delta_Zg(3));
|
||||||
|
|
||||||
|
end
|
||||||
|
|
||||||
|
function NavData = MT18(binMsg,preamble)
|
||||||
|
|
||||||
|
NavData.Nbands = bin2dec(binMsg(15:18)); % Number of bands being broadcast bits 14-17
|
||||||
|
NavData.BandNumber = bin2dec(binMsg(19:22)); % Band number bits 18-21
|
||||||
|
NavData.IODI = bin2dec(binMsg(23:24)); % Issue of data - Ionosphere bits 22-23
|
||||||
|
NavData.IgpMask = binMsg(25:255) == '1'; % Igp Mask bits 24-224 (logic)
|
||||||
|
%NavData.parity = bin2dec(binMsg(1:250));
|
||||||
|
|
||||||
|
fprintf('Preamble: %s \n',preamble)
|
||||||
|
fprintf('Parity: %d \n',0)
|
||||||
|
fprintf('Number of bands being broadcast: %d \n', NavData.Nbands);
|
||||||
|
fprintf('Band number: %d \n', NavData.BandNumber);
|
||||||
|
fprintf('Issue of data - Ionosphere: %d \n',NavData.IODI)
|
||||||
|
disp('Igp Mask: LOGIC ARRAY');
|
||||||
|
|
||||||
|
|
||||||
|
end
|
||||||
|
|
||||||
|
function NavData = MT26(binMsg,preamble)
|
||||||
|
|
||||||
|
idxIGP = [23, 31, 36, 44, 49, 57, 62, 70, 75, 83, 88, 96, 101, 109, 114, 122, 127, 135, 140, 148, 153, 161, 166, 174, 179, 187, 192, 200, 205, 213];
|
||||||
|
idxGIVEI = [32, 35, 45, 48, 58, 61, 71, 74, 84, 87, 97, 100, 110, 113, 123, 126, 136, 139, 149, 152, 162, 165, 175, 178, 188, 191, 201, 204, 214, 217];
|
||||||
|
NavData.BandNumber = bin2dec(binMsg(15:18)); % Band number bits 14-17
|
||||||
|
NavData.BlockID = bin2dec(binMsg(19:22)); % Block ID bits 18-21
|
||||||
|
NavData.IODI = bin2dec(binMsg(218:219)); % Issue of data - Ionosphere bits 217-218
|
||||||
|
%NavData.parity = bin2dec(binMsg(1:250));
|
||||||
|
|
||||||
|
counter = 1;
|
||||||
|
for i = 1:15
|
||||||
|
NavData.GIVEI(i) = bin2dec(binMsg(idxGIVEI(counter):idxGIVEI(counter+1)));
|
||||||
|
NavData.IGP(i) = bin2dec(binMsg(idxIGP(counter):idxIGP(counter+1)))*0.125;
|
||||||
|
counter = counter +2;
|
||||||
|
end
|
||||||
|
|
||||||
|
|
||||||
|
fprintf('Preamble: %s \n',preamble)
|
||||||
|
fprintf('Parity: %d \n',0)
|
||||||
|
fprintf('Band number: %d \n', NavData.BandNumber);
|
||||||
|
fprintf('Block ID: %d \n',NavData.BlockID)
|
||||||
|
fprintf('Issue of data - Ionosphere: %d \n',NavData.IODI);
|
||||||
|
for i = 1:15
|
||||||
|
fprintf('Satellite IGP [ %d ]: ',i+15*NavData.BlockID)
|
||||||
|
fprintf('Grid Ionospheric Vertical Error Index: %d \t',NavData.GIVEI(i))
|
||||||
|
fprintf('IGP Vertical Delay Estimate: %fm \n',NavData.IGP(i));
|
||||||
|
end
|
||||||
|
|
||||||
|
end
|
||||||
|
|
||||||
|
function NavData = MT27(binMsg,preamble)
|
||||||
|
|
||||||
|
idxcoor1lat = [37 44 72 79 107 114 142 149 177 184];
|
||||||
|
idxcoor1lon = [45 53 80 88 115 123 150 158 185 193];
|
||||||
|
idxcoor2lat = [54 61 89 96 124 131 159 166 194 201];
|
||||||
|
idxcoor2lon = [62 70 97 105 132 140 167 175 202 210];
|
||||||
|
idxregshape = [71 106 141 176 211];
|
||||||
|
|
||||||
|
NavData.IODS = bin2dec(binMsg(15:17)); % IODS bits 14-16
|
||||||
|
NavData.NumSerMsg = bin2dec(binMsg(18:20))+1; % Number of service messages bits 17-19
|
||||||
|
NavData.SerMsgNum = bin2dec(binMsg(21:23))+1; % Service message number bits 20-22
|
||||||
|
NavData.NumReg = bin2dec(binMsg(24:26)); % Number of regions bits 23-25
|
||||||
|
NavData.PrioCode = bin2dec(binMsg(27:28)); % Priority Code bits 26-27
|
||||||
|
NavData.dUDREin = bin2dec(binMsg(29:32)); % delta UDRE indicator inside bits 28-31
|
||||||
|
NavData.dUDREout = bin2dec(binMsg(33:36)); % delta UDRE indicator outside bits 32-35
|
||||||
|
%NavData.parity = bin2dec(binMsg(1:250));
|
||||||
|
|
||||||
|
if NavData.NumReg > 0
|
||||||
|
counter = 1;
|
||||||
|
for i = 1:NavData.NumReg
|
||||||
|
NavData.coor1lat(i) = bin2dec(binMsg(idxcoor1lat(counter):idxcoor1lat(counter+1)));
|
||||||
|
NavData.coor1lon(i) = bin2dec(binMsg(idxcoor1lon(counter):idxcoor1lon(counter+1)));
|
||||||
|
NavData.coor2lat(i) = bin2dec(binMsg(idxcoor2lat(counter):idxcoor2lat(counter+1)));
|
||||||
|
NavData.coor2lon(i) = bin2dec(binMsg(idxcoor2lon(counter):idxcoor2lon(counter+1)));
|
||||||
|
NavData.regShape(i) = bin2dec(binMsg(idxregshape(i):idxregshape(i)));
|
||||||
|
counter = counter +2;
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
|
||||||
|
fprintf('Preamble: %s \n',preamble)
|
||||||
|
fprintf('Parity: %d \n',0)
|
||||||
|
fprintf('IODS: %d \n', NavData.IODS);
|
||||||
|
fprintf('Number of service messages: %d \n',NavData.NumSerMsg)
|
||||||
|
fprintf('Service message number: %d \n',NavData.SerMsgNum);
|
||||||
|
fprintf('Number of regions: %d \n',NavData.NumReg)
|
||||||
|
fprintf('Priority Code: %d \n', NavData.PrioCode);
|
||||||
|
fprintf('Delta UDRE indicator inside: %d \n',NavData.dUDREin)
|
||||||
|
fprintf('Delta UDRE indicator outside: %d \n',NavData.dUDREout);
|
||||||
|
% for i = 1:5
|
||||||
|
% fprintf('Satellite IGP [ %d ]: ',i+15*NavData.BlockID)
|
||||||
|
% fprintf('Grid Ionospheric Vertical Error Index: %d \t',NavData.GIVEI(i))
|
||||||
|
% fprintf('IGP Vertical Delay Estimate: %fm \n',NavData.IGP(i));
|
||||||
|
% end
|
||||||
|
|
||||||
|
end
|
||||||
|
|
||||||
|
function [parity] = crc24q(msg)
|
||||||
|
|
||||||
|
% SYNTAX:
|
||||||
|
% [parity] = crc24q(msg);
|
||||||
|
%
|
||||||
|
% INPUT:
|
||||||
|
% msg = binary message
|
||||||
|
%
|
||||||
|
% OUTPUT:
|
||||||
|
% parity = crc parity (24 bits)
|
||||||
|
%
|
||||||
|
% DESCRIPTION:
|
||||||
|
% Applies CRC-24Q QualComm algorithm.
|
||||||
|
|
||||||
|
%----------------------------------------------------------------------------------------------
|
||||||
|
% goGPS v0.4.3
|
||||||
|
%
|
||||||
|
% Copyright (C) 2009-2014 Mirko Reguzzoni, Eugenio Realini
|
||||||
|
%
|
||||||
|
% ('rtcm3torinex.c', by Dirk Stoecker, BKG Ntrip Client (BNC) Version 1.6.1
|
||||||
|
% was used as a reference)
|
||||||
|
%----------------------------------------------------------------------------------------------
|
||||||
|
%
|
||||||
|
% This program is free software: you can redistribute it and/or modify
|
||||||
|
% it under the terms of the GNU General Public License as published by
|
||||||
|
% the Free Software Foundation, either version 3 of the License, or
|
||||||
|
% (at your option) any later version.
|
||||||
|
%
|
||||||
|
% This program is distributed in the hope that it will be useful,
|
||||||
|
% but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
% GNU General Public License for more details.
|
||||||
|
%
|
||||||
|
% You should have received a copy of the GNU General Public License
|
||||||
|
% along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
%----------------------------------------------------------------------------------------------
|
||||||
|
|
||||||
|
parity = uint32(0);
|
||||||
|
|
||||||
|
%check the length of the input string, in case make it splittable byte-wise
|
||||||
|
remainder = rem(length(msg),8);
|
||||||
|
if (remainder ~= 0)
|
||||||
|
fill = char(ones(1,8-remainder)*48); %fill string of zeroes
|
||||||
|
msg = [fill msg];
|
||||||
|
end
|
||||||
|
|
||||||
|
Nbits = length(msg);
|
||||||
|
|
||||||
|
%pre-allocate to increase speed
|
||||||
|
Nbytes = Nbits / 8;
|
||||||
|
bytes = cell(1,Nbytes);
|
||||||
|
k = 1;
|
||||||
|
for j = 1 : 8 : Nbits
|
||||||
|
bytes{k} = msg(j:j+7);
|
||||||
|
k = k + 1;
|
||||||
|
end
|
||||||
|
%call 'fbin2dec' and 'bitshift' only once (to optimize speed)
|
||||||
|
bytes = bitshift(fbin2dec(bytes), 16);
|
||||||
|
bytes = uint32(bytes);
|
||||||
|
for i = 1 : Nbytes
|
||||||
|
parity = bitxor(parity, bytes(i));
|
||||||
|
for j = 1 : 8
|
||||||
|
parity = bitshift(parity, 1);
|
||||||
|
if bitand(parity, 16777216)
|
||||||
|
parity = bitxor(parity, 25578747);
|
||||||
|
end
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
parity = dec2bin(parity, 24);
|
||||||
|
end
|
||||||
|
|
||||||
|
function x=fbin2dec(s)
|
||||||
|
%FBIN2DEC (fast bin2dec) Convert binary string to decimal integer.
|
||||||
|
% X = FBIN2DEC(B) interprets the binary string B and returns in X the
|
||||||
|
% equivalent decimal number. It is a stripped version of "bin2dec", with
|
||||||
|
% a minimal check on input.
|
||||||
|
%
|
||||||
|
% If B is a character array, or a cell array of strings, each row is
|
||||||
|
% interpreted as a binary string.
|
||||||
|
%
|
||||||
|
% Example
|
||||||
|
% fbin2dec('010111') returns 23
|
||||||
|
|
||||||
|
%----------------------------------------------------------------------------------------------
|
||||||
|
% goGPS v0.4.3
|
||||||
|
%
|
||||||
|
% Copyright (C) 2009-2014 Mirko Reguzzoni, Eugenio Realini
|
||||||
|
%----------------------------------------------------------------------------------------------
|
||||||
|
%
|
||||||
|
% This program is free software: you can redistribute it and/or modify
|
||||||
|
% it under the terms of the GNU General Public License as published by
|
||||||
|
% the Free Software Foundation, either version 3 of the License, or
|
||||||
|
% (at your option) any later version.
|
||||||
|
%
|
||||||
|
% This program is distributed in the hope that it will be useful,
|
||||||
|
% but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
% GNU General Public License for more details.
|
||||||
|
%
|
||||||
|
% You should have received a copy of the GNU General Public License
|
||||||
|
% along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
%----------------------------------------------------------------------------------------------
|
||||||
|
|
||||||
|
% handle input
|
||||||
|
s = char(s);
|
||||||
|
|
||||||
|
[m,n] = size(s);
|
||||||
|
|
||||||
|
% Convert to numbers
|
||||||
|
v = s - '0';
|
||||||
|
twos = pow2(n-1:-1:0);
|
||||||
|
x = sum(v .* twos(ones(m,1),:),2);
|
||||||
|
end
|
||||||
|
|
||||||
|
function hexStr = convert2hex(binMsg)
|
||||||
|
% Convertir la cadena binaria a hexadecimal
|
||||||
|
hexStr = '';
|
||||||
|
for i = 1:4:length(binMsg)
|
||||||
|
% Tomar grupos de 4 bits
|
||||||
|
binSegment = binMsg(i:i+3);
|
||||||
|
% Convertir el segmento binario a decimal
|
||||||
|
decValue = bin2dec(binSegment);
|
||||||
|
% Convertir el valor decimal a hexadecimal y concatenar
|
||||||
|
hexStr = [hexStr, dec2hex(decValue)];
|
||||||
|
end
|
||||||
|
end
|
||||||
Loading…
Reference in New Issue
Block a user