I am working with the GPS HDL reference example from MathWorks:
GPS HDL Reference Applications Overview – MATLAB & Simulink
I am implementing this design on ZCU48DR hardware with the following configuration:
RFDC configured for 4 samples per stream and 5× decimation
Input sample rate: 3922.168 MSPS
After additional decimation, the signal enters the acquisition and tracking IP GPS HDL Acquisition and Tracking Using C/A Code – MATLAB & Simulink at 32.768 MHz
The clock provided to the IP is 196.608 MHz
GPS HDL Acquisition and Tracking Using C/A Code – MATLAB & Simulink, and GPS HDL Data Decode and Position Estimation – MATLAB & Simulink are integrated into a single IP, similar to the reference design
I have also verified the 1 kHz navigation data rate on hardware
Issue:
The acquisition stage works correctly (satellites are detected and tracking is stable)
However, in the decoding stage, frame synchronization fails
This suggests that the LNAV data is not valid
To further debug, I generated an 8-second LNAV signal from the acquisition and tracking HDL model in simulation, but the decoder still fails to decode that LNAV signal.
Questions:
Has this GPS HDL reference example been validated on hardware (particularly ZCU48DR or RFSoC platforms)?
What could cause frame synchronization failure even when acquisition and tracking appear correct?
Could there be an issue with bit alignment, timing, or scaling between tracking output and decoder input?
Is there any recommended method to verify LNAV integrity before decoding?
Any guidance on where to debug this issue would be greatly appreciated.I am working with the GPS HDL reference example from MathWorks:
GPS HDL Reference Applications Overview – MATLAB & Simulink
I am implementing this design on ZCU48DR hardware with the following configuration:
RFDC configured for 4 samples per stream and 5× decimation
Input sample rate: 3922.168 MSPS
After additional decimation, the signal enters the acquisition and tracking IP GPS HDL Acquisition and Tracking Using C/A Code – MATLAB & Simulink at 32.768 MHz
The clock provided to the IP is 196.608 MHz
GPS HDL Acquisition and Tracking Using C/A Code – MATLAB & Simulink, and GPS HDL Data Decode and Position Estimation – MATLAB & Simulink are integrated into a single IP, similar to the reference design
I have also verified the 1 kHz navigation data rate on hardware
Issue:
The acquisition stage works correctly (satellites are detected and tracking is stable)
However, in the decoding stage, frame synchronization fails
This suggests that the LNAV data is not valid
To further debug, I generated an 8-second LNAV signal from the acquisition and tracking HDL model in simulation, but the decoder still fails to decode that LNAV signal.
Questions:
Has this GPS HDL reference example been validated on hardware (particularly ZCU48DR or RFSoC platforms)?
What could cause frame synchronization failure even when acquisition and tracking appear correct?
Could there be an issue with bit alignment, timing, or scaling between tracking output and decoder input?
Is there any recommended method to verify LNAV integrity before decoding?
Any guidance on where to debug this issue would be greatly appreciated. I am working with the GPS HDL reference example from MathWorks:
GPS HDL Reference Applications Overview – MATLAB & Simulink
I am implementing this design on ZCU48DR hardware with the following configuration:
RFDC configured for 4 samples per stream and 5× decimation
Input sample rate: 3922.168 MSPS
After additional decimation, the signal enters the acquisition and tracking IP GPS HDL Acquisition and Tracking Using C/A Code – MATLAB & Simulink at 32.768 MHz
The clock provided to the IP is 196.608 MHz
GPS HDL Acquisition and Tracking Using C/A Code – MATLAB & Simulink, and GPS HDL Data Decode and Position Estimation – MATLAB & Simulink are integrated into a single IP, similar to the reference design
I have also verified the 1 kHz navigation data rate on hardware
Issue:
The acquisition stage works correctly (satellites are detected and tracking is stable)
However, in the decoding stage, frame synchronization fails
This suggests that the LNAV data is not valid
To further debug, I generated an 8-second LNAV signal from the acquisition and tracking HDL model in simulation, but the decoder still fails to decode that LNAV signal.
Questions:
Has this GPS HDL reference example been validated on hardware (particularly ZCU48DR or RFSoC platforms)?
What could cause frame synchronization failure even when acquisition and tracking appear correct?
Could there be an issue with bit alignment, timing, or scaling between tracking output and decoder input?
Is there any recommended method to verify LNAV integrity before decoding?
Any guidance on where to debug this issue would be greatly appreciated. rfsoc, simulink, matlab function, hdl coder, navigation toolbox, satellite communication toolbox, fpga, hdl, c/a code, gps, gnss, vivado MATLAB Answers — New Questions

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