Spread spectrum demodulation simulation verification system

Abstract

The invention relates to a spread spectrum demodulation simulation verification system, which comprises a simulation data signal source generation module, a simulation sine and cosine wave generation module, a simulation code offset adaptive adjustment spread spectrum code generation module, a simulation spread spectrum modulation module, a simulation demodulation data receiving module, a simulation working state detection module and a scoreboard module. The method is suitable for ground simulation verification of a spread spectrum baseband processing FPGA in a satellite product, and configuration of a simulation environment can be carried out by changing parameters, so that the working correctness of each module of a spread spectrum demodulation module FPGA can be verified under the condition that Doppler frequency offset of a spread spectrum modulation system is an arbitrary value, especially under the condition of dynamic frequency sweeping. Meanwhile, the intermediate frequency signal input by the FPGA can be adjusted according to the feedback AGC value output by the FPGA, and a closed-loop simulation environment is provided for the baseband processing FPGA.

Description

technical field [0001] The invention relates to the field of spread spectrum transponders in satellite products, in particular to a spread spectrum demodulation simulation verification system. Background technique [0002] Spread spectrum demodulation processors are widely used in satellite engineering as communication equipment. The advantages of using FPGA for spread spectrum demodulation processing design are fast running speed, low power consumption, and low cost. The disadvantage is that the chip is used for design, and the algorithm is very complicated, which leads to the internal signal and its complexity, which is prone to hidden dangers in design. However, the observation signals of the hardware joint test are limited, and it is impossible to observe all the complicated signals and find hidden dangers in the design. [0003] The existing simulation verification methods all use the mathematical modeling software Matlab to simulate the modulation signal to generate t...

AI Technical Summary

Problems solved by technology

However, the computer's cache is limited, so the traditional Matlab analog modulation signal input method can only verify the input of one to several unit signals, often only testing the capture function of the baseband processing FPGA, and there is no way to verify the follow-up tracking and bit synchronization functions

Secondly, even if the computer cache is large enough, using Matlab to generate a frame of data files at a time, it is impossible to test the function of dynamic frequency sweep tracking

Thirdly, the traditional Matlab method of generating data models cannot be conveniently transferred to and from the emulator to achieve AGC feedback and verify the baseband processing FPGA control energy stabilization function. Finally, the traditional Matlab method of generating data models cannot realize remote control data and reception before modulation. The data consistency comparison between the demodulated remote control data cannot complete the closed-loop test, so it is impossible to verify the wrong lock and frame loss of the baseband processing FPGA

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