Study Of Anti-jamming Receiver In The Condition Of Over-Sampling

Satellite navigation and positioning system will inevitably confront a strong jamming environment in the future military application. Therefore, it is very important to improve its anti-jamming ability. Under the background of anti-jamming receiver's research, this dissertation, whose main body is the study of anti-jamming receiver in the condition of over-sampling, includes three parts, faces engineering realization, firstly studies the band-pass filter's optimum bandwidth in the front end of spread spectrum receiver and then analyze the interference suppression in the condition of over-sampling and the design of interpolation filter in the interference suppression algorithm.In the first part, the band-pass filter's optimum relative bandwidth in the front end of spread spectrum receiver is analyzed. It is presented that the receiver band-pass filter's optimum relative bandwidth with the different combination of ideal band-pass filter and several familiar band-pass filters in the receiver and transmitter.In the second part, it brings forward that the interference suppression under the circumstance of over-sampling and confirms the measure of direct interference suppression. The algorithm about over-sampling narrowband interference suppression is given and its engineering realization is considered.The third part lucubrate the design of interpolation filter in the interference suppression algorithm. It compares the advantages and disadvantages of the three basic structures and summarizes the design of half-band filter and CIC (cascaded integrator-comb) filter. Emphases is put on the demonstrating the realization, the order of interpolation and decimation and the multi-stage implement's particularity of fractional ratio interpolation filter.The technique studied in this dissertation can be employed to guide the design of the anti-jamming receiver in bur satellite navigation and positioning system.