基于北斗GEO卫星信号的海面目标非协同探测性能分析

Performance Analysis of Non-cooperative Detection of Sea Surface Target Based on Bei Dou GEO Navigation Satellite Signal

对利用北斗GEO(Geosynchronous Orbit)卫星信号开展海面目标非协同探测的性能进行分析。首先提出了初步系统结构方案,分析了北斗信号并建立了直射和反射信号模型,从最大探测距离和伪随机码模糊性两方面分析了基于北斗卫星信号的海面探测性能。仿真实验结果表明,基于北斗GEO卫星的反射信号在强度和信噪比等指标上都要优于GPS MEO(Medium Earth Orbit)卫星的反射信号,北斗的Kasami码和Gold码在时延和多普勒频移维上都具有很好的时间分辨力,利用北斗GEO卫星信号开展海面目标非协同探测是可行的。

Aiming at the utilization of the BeiDou GEO （Geosynchronous Orbit） Navigation Satellite Signal, thesis con-ducts the argumentation of performance on non-cooperative detection of sea surface target. First, thesis both comes up with the preliminary system structure precept and establishes direct signal and reflection signal model. Besides, the thesis analy-zes the BeiDou GEO Navigation Satellite Signal performance from two aspects ： maximum detection range and ambiguity function of pseudorandom sequence. In addition, the simulation experimental results show that indexes of receiver input power and SNR on BeiDou GEO Satellite reflection signal are better than that on GPS MEO （Medium Earth Orbit） Satel-lite reflection signal. Furthermore, On Delay dimension and Doppler frequency dimension, Kasami code and Gold code of BeiDou have the good resolution. In conclusion, the conduction of Non-cooperative Detection of Sea Surface by utilizing BeiDou GEO satellite signal is feasible.