An Open-Source BDS3 B1C/B2a SDR

Authors

Yafeng Li E-Mail: lyf8118@126.com yali2822@colorado.edu

Nagaraj Channarayapatna Shivaramaiah E-Mail: nagarajcs@colorado.edu

Dennis Akos
E-Mail: dma@colorado.edu 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