分层Duffing振子检测高动态GPS信号的捕获算法

摘要

高动态下,即当加速度、加加速度很大时,GPS的信号捕获在相干累计时间内会存在较大偏差,使得定位很不准确.因此,必须考虑累积时间与多普勒补偿的均衡.针对这一因素,采用了多普勒估计与补偿技术对GPS信号进行捕获.但若没有INS信息,或者INS出现故障时,由于Duffing混沌振子对噪声有较大抑制作用,同时对周期微弱信号非常敏感的特点,提出一种新的采用Duffing混沌振子进行GPS高动态下的信号检测方案.最后对高动态下GPS信号的捕获进行了仿真,结果表明,该方法可以很好地实现高动态GPS信号的快速精确捕获.%The GPS signal capture within coherent accumulated time there will be a large deviation when the acceleration is great which is called high dynamic,so that the positioning accuracy inaccurate-So it is necessary to consider how to balance the cumulative time and Doppler compensation.However,if there is no INS signal or INS fails .the measure estimated and compensated Doppler GPS signal has been invalided.Then a new Duffing chaotic oscillator for high dynamic GPS signal detection has been proposedFinally, simulated the acquisition of high dynamic GPS signal,and the simulated results showed that this method can acquisition high dynamic GPS signal quickly and accurately.