A multi-stage GNSS signal and data simulator
This is a GNSS signal and data simulator and generator to help the development of GNSS receiver. This program support multiple stage of simulation output:
- Reference trajectory of receiver (as standard reference result)
- Observation (help to debug and test PVT program)
- Baseband correlation result (combine with local channel configuration parameters help to debug baseband tracking and control program)
- Digital IF result (help to debug baseband process algorithm)
- A realtime GNSS signal simulator (with hardware signal interpolation and up convertor)
Change list as below:
7/1/2021
An optimized initial version re-published on github
7/5/2021
Add XML format trajectory output
Add support to load BDS ionosphere parameter in RINEX header
Add support to load GPS/BDS/Galileo UTC parameters in RINEX header
Add support to load BDS/Galileo ephemeris in RINEX file
Optimize XML file content interpreter
8/4/2021
Add class NavBit and LNavBit to generate GPS LNAV data stream
8/13/2021
Change format of GNSS_TIME to improve accuracy
Add GetTransmitTime() method
Remove obsolete file
8/30/2021
Fix bug of TOW add extra 1 when put into LNAV data stream
Fix bug of not put in week number in LNAV data stream
Use complete GNSS time to get LNAV data stream
9/30/2021
Add satellite signal power control support in XML
Add RINEX output functions
11/25/2021
Restore CN0 field in SATELLITE_PARAM structure as stored CN0
12/8/2021
Add support for B1C and E1C
12/14/2021
Fix bug of CN0 assign incorrect value during satellite add/remove
Add support for system select
1/5/2022
Add support for B-CNAV2 data stream generation
2/12/2022
Bug fix on B-CNAV1 stream generation
Option to use Vel/Acc to calculated satellite position
1/23/2023
Add some variables and functions for future multi-frequency support
Minor bug fix on satellite acc calculation for GEO satellite
7/28/2023
Modifications to comply with stricter syntax checking
Add SignalSim.h to include all necessary header files for package users
8/9/2023
Add a new class CSatelliteSignal to get data/pilot modulation
Add a new NavBit derived class D1D2NavBit to generate BDS2 data stream
Call to GetFrameData() in NavBit class will be obsolete in the future
8/15/2023
Add pilot bit generation function
Remove pilot bit generation in NavBit and CSatelliteSignal class
GetFrameData() method in NavBit (and derived classes) no longer support pilot bit generation
8/24/2023
Add Galileo I/NAV data stream generation class
Add inter-signal correction (delay between different frequencies) support in XML format
8/30/2023
Add GLONASS satellite parameter and raw measurement calculation
Add GLONASS slot/freq output to RINEX file
Add GLONASS GNAV data stream composition
Leap second correction in CSatelliteSignal
Update the PDF file for design description
9/19/2023
Add complex_number class
Add E5 support
Add dummy F/NAV data stream generation
Satellite signal generation allows NULL pointer for data bit to generate all 0 modulation data
10/28/2023
Replace UnscaleDouble and roundi/roundu with UnscaleInt/UnscaleUint
Add UnscaleLong/UnscaleULong to better support data fields longer than 32bit (C-NAV and BC-NAV)
11/13/2023
Add support to RINEX 4 format navigation file
Modify Rinex.cpp to support RINEX 4 format data set
Expand and modify GPS_EPHEMERIS structure to support ephemeris from different navigation data format
Calculate clock/delay for different frequency with corresponding parameters
11/27/2023
Change BCNavBit to virtual class and derive three classes for B-CNAV1/2/3 data stream
Combine iode2/iode3 to iode in ephemeris structure
Add B-CNAV2 and B-CNAV3 support in CSatelliteSignal
Modify GetTravelTime() and GetCarrierPhase() to use correct group delay
1/6/2024
Add GPS L1C CNAV2 navigation stream generation class
Fix bugs in BDS D1/D2 navigation stream generation
Add L1C/L5/E6 support into CSatelliteSignal class
Observation support multi-frequency in structure and RINEX output
2/29/2024
Made following changes to enable almanac read and data stream generation containing almanac subframe/string
Change function parameter of SetAlmanac() in NavBit and all derived classes
Add functions to read almanac file in Almanac.cpp
Add array to store almanacs in CNavData class
Add functions to read almanac files and convert ephemeris to almanac in CNavData class
Ephemeris to almanac conversion for GLONASS and BDS GEO satellites will be added in future version
The time parameter of FindEphemeris() and FindGloEphemeris() definition changes to follow corresponding system
Add almanac subframe/string generation for D1/D2, LNAC and GNAV data stream
6/5/2024
Add almanac word (word 710) to Galileo E1 data stream
Add Reed-Solomon encoded ephemeris (word 1720) to Galileo E1 data stream
Bug fixes on E1 ephemeris word and TOW composition