P码直捕的搜索策略与参数设计

研究低信噪比和高动态环境下P码直接捕获算法的搜索策略与参数设计.利用非相干积累与峰值位置约束的唐判决算法,增强灵敏度性能;提出了一种改进的搜索策略,将时域不确定范围分段,以适应高动态环境;通过一个实例介绍算法参数设计的方法,优化了单次检测概率、虚警概率、非相干积累次数、唐检参数与时域分段数.仿真结果表明,改进的搜索策略降低了漏检概率达30%;设计的参数可以在接收信号功率为-133 dB(mW量级),运动速度为900 m/s,加速度为20g,时间不确定范围为±1 s的情况下,虚警概率低于10-7,检测概率大于90%,捕获时间低于50 s.

Searching Strategy and Parameters Design of Direct P Code Acquisition Method

The direct acquisition method of P code is researched for the receivers under low SNR and high dynamic environment.The method uses non-coherent integration and Tong multiple trials with the position constraining of peak value to increase the detecting ability for weak signal.An improved searching strategy is put forward for adapting the environment of high dynamic by dividing time domain.Then the method parameters are optimized for one special application,including detecting probability,false alarm probabil...