An Open-Source BDS3 B1C/B2a SDR

Authors

Yafeng Li E-Mail: [email protected] [email protected]

Nagaraj Channarayapatna Shivaramaiah E-Mail: [email protected]

Dennis Akos
E-Mail: [email protected] HP: http://www.colorado.edu/aerospace/dennis-akos

Features

• GNSS signal processing functions written in MATLAB
  • Code generations
  • Signal acquisition / tracking (data + pilot)
  • Decoding navigation messages
  • Pseudo-range mesurement generation
  • Calculation of position
• Support following signals
  • Beidou Phase III B2a
  • Beidou Phase III B1C
• Support RF binary file for post processing
  • All the SDRs have been tested with IF signals collected by the NUT4NT sampler of the Amungo Navigation company

Directory and Files

./Doc Summary PowerPoint documents for each SDR receiver ./Common Common functions between differnt SDR receivers ./IF_Data_Set Folder containing the IF data sets to be processed and corresponding Metadata files ./BDS_B1C Beidou B1/B2 SDR receiver ./include Functions related to NAV data decoding and PVT computation
./init.m Strating function of the receiver
./initSettings.m Parameter configurations of the receiver
./postProcessing.m Top level processing function of the receiver
./acquisition.m Signal acquisition function
./tracking.m Signal tracking function ./postNavigation.m PVT computation ./BDS_B2a Beidou B1/B2 SDR receiver ./include Functions related to NAV data decoding and PVT computation
./init.m Strating function of the receiver
./initSettings.m Parameter configurations of the receiver
./postProcessing.m Top level processing function of the receiver
./acquisition.m Signal acquisition function
./tracking.m Signal tracking function ./postNavigation.m PVT computation

Software Dependencies

• All the SDRs have been tested on MATLAB R2016b and R2013b. Some functions of the MATLAB Communications System Toolbox are needed: -- Create Galois field array: gf() -- BCH decoder: bchdec() -- Detect errors in input data using CRC: comm.CRCDetector() -- Convert convolutional code polynomials to trellis description: poly2trellis() -- Convolutionally decode binary data using Viterbi algorithm: vitdec() -- Detect errors in input data using CRC: step()

How to use

• Step 1: Copy the IF data file into folder "IF_Data_Set";
• Step 2: Configue parameters related to IF data file in function "initSettings.m";
• Step 2: Start processing by runing function "init.m".

Implementation details

See the reference: Li, Y., Shivaramaiah, N.C. & Akos, D.M. Design and implementation of an open-source BDS-3 B1C/B2a SDR receiver. GPS Solut (2019) 23: 60. https://doi.org/10.1007/s10291-019-0853-z

Signals to be downloaded are in the following link

• Beidou_B3I_IF_signal.bin * link: https://pan.baidu.com/s/14X937mHKtB4pxZKPPlDx6A password: p9v9 * dataType: schar * fileType: 8 bit real samples * IF: 8.52e6 Hz * sampling Frequency: 40e6 Hz
• B1C_fs_99.375_if14.58.bin * (link:): https://pan.baidu.com/s/12X4Ov-eSDb7w11CydI6ryg password: srgh * dataType: schar * fileType: 8 bit real samples * IF: 14.58e6 Hz * sampling Frequency: 99.375e6 Hz
• B1I_IF3.902_Fs23.8.bin * (link:): https://pan.baidu.com/s/1sjvP9ONP7fh9vR6a3_bGzg password: z95r * dataType: schar * fileType: 8 bit real samples * IF: 14.58e6 Hz * sampling Frequency: 99.375e6 Hz
• GPS_L2C_IF_signal.bin * (link:): https://pan.baidu.com/s/1TB4NBtFG0Bgx3iOboyHObg password: 7kqe * dataType: schar * fileType: 8 bit real samples * IF: 7.4e6 Hz * sampling Frequency: 53e6 Hz
• GPS_L1_CA_IF_signal.bin * (link:) https://pan.baidu.com/s/1Y78Qlxo2rgIcGXDHiPQ_aw password: 2dr5 * dataType: schar * fileType: 8 bit real samples * IF: 14.58e6 Hz * sampling Frequency: 53e6 Hz
• IF_Data_Set_L5C.bin * (link:): https://pan.baidu.com/s/1L7yyjzLAHsUKkRdLqEIWOQ password: 7r94 * dataType: schar * fileType: 8 bit real samples * IF: 13.55e6 Hz * sampling Frequency: 99.375e6 Hz
• Galileo_E5a_IF_signal.bin * link: https://pan.baidu.com/s/1e0RJsq1c8sfoxQvs6ItO2Q password: 1j33 * dataType: schar * fileType: 8 bit real samples * IF: 13.55e6 Hz * sampling Frequency: 99.375e6 Hz
• BDS_B2a_IF_signal.bin * (link:): https://pan.baidu.com/s/1jqrCt9BcakgqDFUFiKl50Q password: kf4c * also for Galileo E5a * dataType: schar * fileType: 8 bit real samples * IF: 13.55e6 Hz * sampling Frequency: 99.375e6 Hz
• BDS_B2a_IF_signal.bin * (link:): https://pan.baidu.com/s/1z-7jWyRvdNVqHM51-Ac16Q password: 5a7d * also for Galileo E5b * dataType: schar * fileType: 8 bit real samples * IF: 17.14e6 Hz * sampling Frequency: 99.375e6 Hz