High-precision doppler shift intermediate frequency simulation method of navigation signal based on variable frequency dynamic sampling

A method of high dynamic Doppler shift simulation with time-varying sampling interval on intermediate frequency simulator was presented. Based on satellite movement model, the high dynamic frequency shift characteristic of the signal was researched and a Pseudo-code and carrier Doppler shift simulated method was proposed as well based on variable frequency dynamic samplings. A design scheme of high-precision Doppler simulation was given, it reduces the system hardware complexity by omitting the code numerically controlled oscillator module in conventional methods. With analysis on error accuracy of pseudo-code frequency, the closed-form solution of the main parameters was derived. Simulation shows that the method can effectively improve the accuracy of the Doppler shift simulation, and provide high stability under high dynamic environment, with which, the frequency of the received signal will reach a finite second-order change rate.