GNSS Software Defined Radio
Custom signal generation and detailed modeling of tracking loops
Description
This project is developed in context of bachelor's thesis at CTU in Prague, department of Radioelectronics.
Getting Started
Dependencies
Only Matlab is needed to run this program (recommended R2021a).
Installing
- Clone this repository or download it as .zip
- Make sure figures/ folder exists in gnss/
Executing program
- Adjust settings in sdr.m to fit your satellite and signal
- Set up the tracking loops
% filter order
settings.filt_ord.DLL = 1; % [0, 1, 2, 3]
settings.filt_ord.PLL = 0; % [0, 1, 2, 3]
settings.filt_ord.FLL = 2; % [0, 1, 2]
settings.filt_ord.FLL_PLL = 0; % [0, 12, 23] ; FLL-assisted-PLL
% 12 -> 1st ord. FLL, 2nd ord. PLL- Remember to turn the correct feedbacks on
settings.carrier_on = 1; % 0 -> carrier wiped off
settings.code_on = 1; % 0 -> code is locked
settings.DLL_fb = 1; % 0 -> DLL feedback off
settings.PLL_fb = 0; % 0 -> PLL feedback off (set 1 when using FLL_PLL)
settings.FLL_fb = 1; % 0 -> FLL feedback off- Choose which figures interst you
settings.plot.signal = 'off'; % plot generated signal [on / off]
settings.plot.acq = 'off'; % plot results of acquisition [on / off]
settings.plot.DLL = 'on'; % plot DLL output [on / off]
settings.plot.PLL = 'on'; % plot PLL output [on / off]
settings.plot.FLL = 'on'; % plot FLL output [on / off]
settings.plot.cor = 'on'; % plot correlators [on / off]
settings.plot.filt = 'on'; % plot integrators and filter output [on / off]
settings.plot.veloc = 'on'; % plot mutual velocity estimate [on / off]- Run the program from Matlab editor or from Matlab console as
>> sdrAuthors
Anastas Nikolov
nikolana@fel.cvut.cz
Acknowledgments
Borre - A Software-Defined GPS and Galileo Receiver
Kaplan & Hegarty - Understanding GPS GNSS. Principles and Applications (2018, Artech)