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P码直捕的搜索策略与参数设计

Keywords: 直接捕获,搜索策略,算法参数

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Abstract:

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

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