一种时差/频率差快速联合估计方法

利用主星和邻近星转发信号的互模糊函数(Cross Ambiguity Function-CAF)进行定位参数的估计是通信卫星干扰源定位的一种重要方法.由于这种参数估计是二维平面上的迭代搜索运算,达到估计精度需要处理很长的数据,计算量巨大,处理速度一直是该方法应用的瓶颈.分析了参数估计精度对时间/带宽的要求,设计了具有不同分辨率的时域双模式搜索流程直接减少信号处理的数据点数,并提出了用卫星星历辅助产生搜索初值的方法,降低了CAF参数估计的运算量.新方法与传统试探方法的运算量比较和对实际信号的处理实验验证了处理方法的有效性.

Fast algorithm for joint estimation of DTO and DFO

Utilizing cross ambiguity function between a main satellite and its neighbor satellite to estimate the parameters of location is an important method for location of interference sources of communication satellite. The 2-D computation needs a long integration time and brings great burden on the digital processing, however, this results in a choke point for application of the method in location system. A fast approach using two-mode time domain searching was introduced in this paper. Furthermore, an algorithm using satellite ephemeris to calculate the initial value of the estimation was also presented. The effectiveness of the proposed approach is proven by comparing with traditional methods and experimental results from actual signals relayed by two satellites.