The Performance Evaluation And Synchronization Implementation Of BPSK Under The Plasma Sheath

When space aerocraft reentry atmosphere at a hypersonic speed, a layer of plasma sheath will come into being on the surface of space aerocraft because of high temperature、high pressure and friction with atmosphere, the existence of plasma sheath will exert severe influence on communication of space aerocraft。Binary Phase Shift Keying(BPSK) is widely adopted by the low bit rate data channel of Telemetry business。 The performance of communication of BPSK under the plasma sheath is vital to the space aerocraft when it reentries。This paper mainly studies the performance evaluation and synchronization implementation of BPSK under the plasma sheath environment。This paper deeply analyzes characteristics of plasma sheath channel, and it proposes a reasonable channel model, it’s a channel model which composed of plasma sheath attenuation function and commonly used wireless channel。The synchronization of receiver uses the principle of PN code synchronization as basic theory, it adopts matched filter and delay locked tracking loop to implement the acquisition and tracking of signal, and it implements the two-dimensional search of phase-doppler frequency shift and completes the evaluation and compensation of Doppler frequency shift by using the algorithm of doppler frequency shift evaluation based on FFT。And it proves that the synchronization system certainly can completes the task of acquisition and tracking with simulation。The whole communication system is built by MATLAB platform, and analyzes the influence of electron density、transmission coefficient、mean square delay、phase shift on this system, there are some references on practical application。...