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Add work on ISM

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This commit is contained in:
Carles Fernandez 2024-08-28 11:13:54 +02:00
parent 4c8cde1ec7
commit 557a7f7265
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GPG Key ID: 4C583C52B0C3877D
3 changed files with 46 additions and 10 deletions
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34
src/core/system_parameters/galileo_ism.cc
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@ -184,7 +184,7 @@ bool Galileo_ISM::check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) c
boost::to_block_range(frame_bits, std::back_inserter(bytes));
std::reverse(bytes.begin(), bytes.end());
boost::crc_32_type crc32_ism;
boost::crc_optimal<32, 0xC0A0A0D5, 0xFFFFFFFF, 0xFFFFFFFF, true, true> crc32_ism;
crc32_ism.process_bytes(bytes.data(), GALILEO_ISM_CRC_DATA_BYTES);
const uint32_t crc_computed = crc32_ism.checksum();
if (this->ism_crc == crc_computed)
@ -193,4 +193,36 @@ bool Galileo_ISM::check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) c
}
return false;
}
bool Galileo_ISM::ism_apply_to_sat(uint32_t prn) const
{
if (prn == 0 || prn > 63)
{
return false;
}
std::bitset<32> bs(this->ism_mask);
if (this->ism_mask_msb == 0)
{
if (prn <= 32)
{
return bs[prn - 1];
}
else
{
return false;
}
}
else
{
if (prn > 32)
{
return bs[prn - 32];
}
else
{
return false;
}
}
}

19
src/core/system_parameters/galileo_ism.h
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@ -57,16 +57,17 @@ public:
void set_ism_Tvalidity(uint8_t tvalidity);
void set_ism_crc(uint32_t crc);
bool check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) const;
bool check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) const; //!< Requires ism_crc to be already set
bool ism_apply_to_sat(uint32_t prn) const; //!< Returns true if ISM parameters apply to the prn satellite, false otherwise
double get_pconst_value() const;
double get_psat_value() const;
float get_ura_m() const;
float get_ure_m() const;
float get_bnom_m() const;
uint16_t get_WN_ISM() const;
uint16_t get_t0_ISM() const;
uint16_t get_Tvalidity_hours() const;
double get_pconst_value() const; //!< A priori constellation fault probability
double get_psat_value() const; //!< A priori satellite fault probability
float get_ura_m() const; //!< User Range Accuracy, in m, used for integrity
float get_ure_m() const; //!< User Range Error, in m, used for accuracy
float get_bnom_m() const; //!< Maximum nominal bias for a satellite, in m
uint16_t get_WN_ISM() const; //!< ISM Week Number, in weeks
uint16_t get_t0_ISM() const; //!< ISM Time of Week, in seconds
uint16_t get_Tvalidity_hours() const; //!< Validity duration of ISM content, in hours
private:
// ICD 2.1 Table 97

3
src/tests/test_main.cc
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@ -95,6 +95,9 @@ DECLARE_string(log_dir);
#include "unit-tests/system-parameters/glonass_gnav_ephemeris_test.cc"
#include "unit-tests/system-parameters/glonass_gnav_nav_message_test.cc"
#include "unit-tests/system-parameters/has_decoding_test.cc"
#include "unit-tests/system-parameters/galileo_ism_test.cc"
#ifndef EXCLUDE_TESTS_REQUIRING_BINARIES
#include "unit-tests/control-plane/control_thread_test.cc"