摘要
讨论了各种GPS信号捕获算法,针对采用圆周相关法进行GPS信号捕获中FFT点数为非2的整数次幂的问题,分析了传统补零法和内插法的缺陷,并提出了一种新的基2-FFT捕获算法,该算法通过将采样数据和本地参考码均补零到大于自身长度两倍后做基2-FFT进行圆周相关,理论分析和仿真表明,该算法可以得到与非2的整数次幂点数的圆周相关一样的结果。
Several GPS acquisition algorithms are discussed,in order to solve the problem of the point of FFT is not the power of 2,the limitation of zero padded method and interpolation method are analysed,and a new acquisition algorithm based on radix-2 FFT is presented,circular correlation is accomplished using radix-2 FFT by padding zero to both sampled data and local reference code,and the new length is larger than the double of original length,from theoretical analysis and simulation,it is shown that the result of this new algorithm is equal to the result of circular correlation where the point is not the power of 2.
出处
《微计算机信息》
2010年第7期6-7,25,共3页
Control & Automation
