基于信噪比控制的滑动相关捕获法

Sliding Correlation Acquisition Method Based on SNR Control

针对复杂电磁环境下接收信噪比会发生随机变化,提出了一种基于信噪比控制的滑动相关捕获算法。在分析滑动相关法的性能基础上,引入自适应结构,根据接收信噪比设置本地积分时间。研究了积分时间对捕获性能的影响,通过仿真验证该方法的有效性。根据积分时间不同,在SNR>-3 dB时,平均捕获时间最大可以减少50%,满足信噪比变化情况下对捕获性能的设计需求。

As the acquiring SNR is time varing in complex electromagnetism environment, a sliding correlation acquition method based on SNR control is presented. Based on the performance analysis of the sliding correlation method, an adaptive scheme was considered to be constructed which achieved the goal to set the time of integral in SNR control, how did the parameters affect the performance of acquisition was studied as well. Simulations show that the proposed method was effective which could reduce the mean code acquisition time by 50% largest when SNR 〉 -3 dB according to different integration time, the method meet the design requirements of acquisition prop- erties under the SNR change environment.