研究目的
To generate and analyze Pseudo Random Noise (PRN) codes for the Standard Positioning Service (SPS) signal in the Indian Regional Navigational Satellite System (IRNSS), including the derivation of Power Spectral Density for CDMA signals and implementation on FPGA hardware.
研究成果
The paper successfully generated and analyzed SPS PRN codes for IRNSS, with properties such as balance and correlation verified. Simulation and hardware implementation on FPGA yielded results within theoretical limits, demonstrating the feasibility of the approach for navigation systems. Future work could extend to other codes or systems.
研究不足
The study is limited to IRNSS SPS signals and specific polynomials; it may not generalize to other GNSS systems. Hardware implementation was on a specific FPGA kit, which could constrain scalability. Memory issues occurred in SIMULINK for large data bits.
1：Experimental Design and Method Selection:
The experiment involved generating SPS PRN codes using polynomials G1 and G2 similar to GPS C/A codes, as per IRNSS_SPS_ICD_June
2：BPSK modulation was used to generate CDMA signals, and analysis was performed in the time domain to derive Power Spectral Density. Sample Selection and Data Sources:
20 The codes were generated for IRNSS satellites, with specific polynomials and initial states for shift registers.
3：List of Experimental Equipment and Materials:
Xilinx ISE simulator, MATLAB software, Spartan-II FPGA kit (model pq208), and related hardware for implementation.
4：Experimental Procedures and Operational Workflow:
Codes were generated using linear feedback shift registers (LFSRs), modulated with BPSK, and simulated in MATLAB and Xilinx ISE. Hardware implementation was done on FPGA, with verification through LED outputs.
5：Data Analysis Methods:
Analysis included autocorrelation, cross-correlation, balance property checks, and Power Spectral Density calculation using MATLAB and simulation tools.
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