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Add work on OSNMA Rx

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This commit is contained in:
Carles Fernandez 2023-06-02 13:13:55 +02:00
parent 3d86bde405
commit 3a803e01e4
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GPG Key ID: 4C583C52B0C3877D
2 changed files with 70 additions and 35 deletions
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76
src/core/libs/osnma_msg_receiver.cc
View File

@ -23,6 +23,7 @@
#include <glog/logging.h> // for DLOG
#include <gnuradio/io_signature.h> // for gr::io_signature::make
#include <bitset>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <iostream>
@ -268,46 +269,54 @@ void osnma_msg_receiver::process_dsm_message(const std::vector<uint8_t>& dsm_msg
{
d_osnma_data.d_dsm_kroot_message.p_dk[k] = dsm_msg[13 + bytes_lk + l_ds_bytes + k];
}
// validation of padding
std::vector<uint8_t> M;
M.push_back(nma_header);
for (int i = 1; i < 13; i++)
{
M.push_back(dsm_msg[i]);
}
for (uint16_t i = 0; i < bytes_lk; i++)
{
M.push_back(dsm_msg[13 + i]);
}
for (uint16_t k = 0; k < l_ds_bytes; k++)
{
M.push_back(dsm_msg[13 + bytes_lk + k]);
}
std::vector<uint8_t> hash = computeSHA256(M);
std::vector<uint8_t> p_dk_computed;
for (uint16_t i = 0; i < l_pdk_bytes; i++)
uint16_t check_l_dk = 104 - std::ceil(1 + (((bytes_lk * 8) + l_ds_bits) / (104)));
if (l_dk_bits != check_l_dk)
{
p_dk_computed.push_back(hash[i]);
std::cout << "OSNMA: Failed length reading" << std::endl;
}
if (d_osnma_data.d_dsm_kroot_message.p_dk == p_dk_computed)
else
{
std::cout << "OSNMA: DSM-KROOT message validated" << std::endl;
// validation of padding
std::vector<uint8_t> M;
M.push_back(nma_header);
for (int i = 1; i < 13; i++)
{
M.push_back(dsm_msg[i]);
}
for (uint16_t i = 0; i < bytes_lk; i++)
{
M.push_back(dsm_msg[13 + i]);
}
for (uint16_t k = 0; k < l_ds_bytes; k++)
{
M.push_back(dsm_msg[13 + bytes_lk + k]);
}
std::vector<uint8_t> hash = computeSHA256(M);
std::vector<uint8_t> p_dk_computed;
for (uint16_t i = 0; i < l_pdk_bytes; i++)
{
p_dk_computed.push_back(hash[i]);
}
if (d_osnma_data.d_dsm_kroot_message.p_dk == p_dk_computed)
{
std::cout << "OSNMA: DSM-KROOT message validated" << std::endl;
}
}
}
else if (d_osnma_data.d_dsm_header.dsm_id >= 12 && d_osnma_data.d_dsm_header.dsm_id < 16)
{
LOG(WARNING) << "OSNMA: DSM-PKR message received.";
// DSM-PKR message
d_osnma_data.d_dsm_pkr_message.nb_dp = (dsm_msg[0] & 0b11110000) >> 4;
d_osnma_data.d_dsm_pkr_message.mid = (dsm_msg[0] & 0b00001111);
d_osnma_data.d_dsm_pkr_message.nb_dp = get_number_blocks_index(dsm_msg[0]);
d_osnma_data.d_dsm_pkr_message.mid = get_mid(dsm_msg);
for (int k = 0; k > 128; k++)
{
d_osnma_data.d_dsm_pkr_message.itn[k] = dsm_msg[k + 1];
}
d_osnma_data.d_dsm_pkr_message.npkt = (dsm_msg[129] & 0b11110000) >> 4;
d_osnma_data.d_dsm_pkr_message.npktid = (dsm_msg[129] & 0b00001111);
d_osnma_data.d_dsm_pkr_message.npkt = get_npkt(dsm_msg);
d_osnma_data.d_dsm_pkr_message.npktid = get_npktid(dsm_msg);
uint32_t l_npk = 0;
const auto it = OSNMA_TABLE_5.find(d_osnma_data.d_dsm_pkr_message.npkt);
@ -333,10 +342,19 @@ void osnma_msg_receiver::process_dsm_message(const std::vector<uint8_t>& dsm_msg
}
uint32_t l_dp = dsm_msg.size();
uint32_t l_pd = l_dp - 130 - l_npk;
d_osnma_data.d_dsm_pkr_message.p_dp = std::vector<uint8_t>(l_pd, 0);
for (uint32_t k = 0; k > l_pd; k++)
uint32_t check_l_dp = 104 - std::ceil((1040 + l_npk * 8) / 104);
if (l_dp != check_l_dp)
{
d_osnma_data.d_dsm_pkr_message.p_dp[k] = dsm_msg[l_dp - l_pd + k];
std::cout << "OSNMA: Failed length reading" << std::endl;
}
else
{
d_osnma_data.d_dsm_pkr_message.p_dp = std::vector<uint8_t>(l_pd, 0);
for (uint32_t k = 0; k > l_pd; k++)
{
d_osnma_data.d_dsm_pkr_message.p_dp[k] = dsm_msg[l_dp - l_pd + k];
}
}
}
else

29
src/core/system_parameters/Galileo_OSNMA.h
View File

@ -165,6 +165,9 @@ constexpr std::uint8_t mask_dsm_ks{0xF0};
constexpr std::uint8_t mask_dsm_ts{0x0F};
constexpr std::uint8_t mask_dsm_reserved{0xF0};
constexpr std::uint8_t mask_dsm_wk_k_msbyte{0x0F};
constexpr std::uint8_t mask_dsm_mid{0x0F};
constexpr std::uint8_t mask_dsm_npkt{0xF0};
constexpr std::uint8_t mask_dsm_npktid{0x0F};
#else
constexpr std::uint8_t mask_nmas{0b1100'0000};
constexpr std::uint8_t mask_cid{0b0011'0000};
@ -182,6 +185,9 @@ constexpr std::uint8_t mask_dsm_ks{0b1111'0000};
constexpr std::uint8_t mask_dsm_ts{0b0000'1111};
constexpr std::uint8_t mask_dsm_reserved{0b1111'0000};
constexpr std::uint8_t mask_dsm_wk_k_msbyte{0b0000'1111};
constexpr std::uint8_t mask_dsm_mid{0b0000'1111};
constexpr std::uint8_t mask_dsm_npkt{0b1111'0000};
constexpr std::uint8_t mask_dsm_npktid{0b0000'1111};
#endif
// // hf = (dsm_msg[1] & 0b00001100) >> 2;
@ -328,12 +334,23 @@ std::string get_hash_function(uint8_t hf)
}
return hash_;
}
// std::string hash_function;
// const auto it3 = OSNMA_TABLE_8.find(d_osnma_data.d_dsm_kroot_message.hf);
// if (it3 != OSNMA_TABLE_8.cend())
// {
// hash_function = it3->second;
// }
uint8_t get_mid(const std::vector<uint8_t>& dsm_msg)
{
return (dsm_msg[0] & mask_dsm_mid);
}
uint8_t get_npkt(const std::vector<uint8_t>& dsm_msg)
{
return ((dsm_msg[129] & mask_dsm_npkt) >> 4);
}
uint8_t get_npktid(const std::vector<uint8_t>& dsm_msg)
{
return (dsm_msg[129] & mask_dsm_npktid);
}
/** \} */
/** \} */
#endif // GNSS_SDR_GALILEO_OSNMA_H