Doppler simulation method for high dynamic satellite navigation signal
A third-order DDS navigation signal simulation algorithm based on phase reset is proposed to address the difficulty of simulating Doppler frequency in high dynamic scenarios for satellite navigation signal simulation sources.This method starts with the physical model of relative motion between satellites and receivers,and establishes a third-order DDS model based on digital circuits,which can effectively simulate the Doppler frequency of navigation signals containing high-order terms in high dynamic scenarios.In addition,phase reset is performed on key parameters in the third-order DDS model to avoid cumulative errors.Simulation was conduct-ed in a computer,and the results showed that in a high dynamic scenario with a speed of 10000 m/s,an acceleration of 1000 m/s2,and a jerk of 1000 m/s3,the algorithm improved the Doppler frequency simulation accuracy by 31 dB compared to traditional algorithms,and did not deteriorate accuracy due to increased jerk.The Doppler frequency simulation accuracy can reach-36 dB or higher.This method can accurately simulate the Doppler frequency of navigation signals in high dynamic scenarios and has a certain degree of robustness.
Doppler frequencyHigh dynamicThird order DDSSimulation accuracy
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