Awesome

GNSS codes, signals and spectrum generation for Matlab

All the contents were developed for the passive remote sensing group (RSLab) as a part of the Remote Sensing Laboratory, a research line of the CommmSensLab Group at the Signal Theory and Communications Department (TSC) of the Universitat Polit�cnica de Catalunya (UPC).

The first version of this program was uploaded in the IEEE Remote Sensing Code Library (RSCL) with DOI: 10.21982/M8F59K

New versions of this program may be found at GitHub.

Contents

\documentation

• GNSS_signals_v1.0.pdf: A summary of the GNSS codes, signals, spectrum and auto-correlation functions.
• Official ICD documents can be obtained from here.

\prn_codes

• Matlab data container (.mat) files with next unsampled codes:
• GPS: L1CA, L2CM, L2CL, L5I, L5Q. Galileo: E1B, E1C, E5aI, E5aQ, E5bI, E5bQ. BeiDou-2: B1I

\real_data

Real data captures can be used to test the functions. Get them here.

• capture_04.mat

  • fs = 2.5 MSps
  • duration = 1.5 s
  • band: L2 (1.2276 GHz)
  • Known present PRNs: GPS L2C 26
  • data type: Matlab complex int16 (I don't remember the original bit depth, but most probably was 8 bits)

• test_2_cut.dat

  • fs = 20 MSps
  • duration = 5 ms
  • band: L1 (1.57543 GHz)
  • Known present PRNs: GPS L1 C/A 13
  • baseband 16 bits complex (16 bit I + 16 bit Q)
  • data type: signed int16

• test_4_cut.dat

  • band: L5 (1.17645 GHz)
  • Known present PRNs: GPS L5 30
  • baseband 16 bits complex (16 bit I + 16 bit Q)
  • fs = 20 MSps
  • duration = 20 ms
  • data type: signed int16

• test_5_cut.dat

  • band: E5A (1.176450000 GHz)
  • Known present PRNs: Galielo E5A 30
  • baseband 16 bits complex (16 bit I + 16 bit Q)
  • fs = 20 MSps
  • duration = 5 ms
  • data type: signed int8

• test_6_cut.dat

  • band: E5B (1.20714 GHz)
  • Known present PRNs: Galielo E5B 7
  • baseband 16 bits complex (16 bit I + 16 bit Q)
  • fs = 20 MSps
  • duration = 5 ms
  • data type: signed int8

• test_11_cut.dat

  • band: E5 (1.191795 GHz)
  • Known present PRNs: Galielo E5 3
  • baseband 8 bits complex (8 bit I + 8 bit Q)
  • fs = 50 MSps
  • duration = 100 ms
  • data type: signed int8

• test_14_cut.dat

  • band: E1 (1.57543 GHz)
  • Known present PRNs: Galielo E1OS 3
  • baseband 8 bits complex (8 bit I + 8 bit Q)
  • fs = 50 MSps
  • duration = 100 ms
  • data type: signed int8

\source

• GNSScodegen.m: Generates GNSS unsampled codes.

  • GPS: L1CA, L2CM, L2CL, L5I, L5Q.
  • Galileo: E1B, E1C, E5aI, E5aQ, E5bI, E5bQ.
  • BeiDou-2: B1I.

• GNSSsecondarygen.m: Generates GNSS unsampled secondary codes

  • GPS: L5I, L5Q.
  • Galileo: E1C, E5aI, E5aQ, E5bI, E5bQ.

• GNSSsignalgen.m: Generates sampled GNSS signals.

  • L1CA: GPS L1 C/A signal
  • L2C: GPS L2C signal
  • L2CM: GPS L2C data component
  • L2CL: GPS L2C pilot component
  • L5: GPS L5 signal without secondary codes
  • L5+: GPS L5 signal with secondary codes
  • L5I: GPS L5 signal data component without secondary codes
  • L5Q: GPS L5 signal pilot component without secondary codes
  • L5I+: GPS L5 signal data component with secondary codes
  • L5Q+: GPS L5 signal pilot component with secondary codes
  • E1OS: Galileo E1OS signal with secondary codes
  • E1OS+: Galileo E1OS signal without secondary codes
  • E1OS_complex: Galileo E1OS signal without secondary codes with the E1C component in the imaginary part
  • E1OS+_complex: Galileo E1OS signal with secondary codes with the E1C component in the imaginary part
  • E1OS_B: Galileo E1OS data component
  • E1OS_C: Galileo E1OS pilot component
  • E1OS+_C: Galileo E1OS pilot component with secondary codes
  • E5: Galileo E5 signal without secondary codes
  • E5+: Galileo E5 signal with secondary codes
  • E5A: Galileo E5A signal without secondary codes
  • E5B: Galileo E5A signal without secondary codes

• BOCgen.m: Generates the sub-carriers needed for the BOC-based modulations

• GNSSspectrumgen.m: Generate GNSS analytical spectra.

  • GPS L1: L1CA, L1P, L1M, L1C, L1Cd, L1Cp, L1Cp1, L1Cp2, L1, L1_new.
  • GPS L2: L2C, L2P, L2M, L2, L2_new.
  • GPS L5: L5I, L5Q, L5, L5_new
  • Galileo E1: E1PRS/EA, E1OS.
  • Galileo E6: E6PRS/E6OS.
  • Galileo E5: E5, E5A, E5B.
  • BeiDou-2 Current:
    • B1: B11, B12, B1
    • B2: B2I, B2Q, B2
    • B3: B3
  • BeiDou-2 Future:
    • B1: B1Cd, B1Cp, B1C, B1_new
    • B2: B2_new
    • B3: B3_new, B3A, B3composite

\examples

Example files calling the above functions.

Licence

You may find a specific licence files in each directory.

Contact

Daniel Pascual (daniel.pascual at protonmail.com)