基于复合伪码的多卫星信号联合捕获算法

针对冷启动时二进制偏移载波（binary offset carrier，BOC）调制信号首次定位时间较长的问题，本文提出了一种基于复合伪码的多卫星信号联合捕获算法，可以实现对多颗卫星信号的同时捕获.该方法将不同卫星信号所对应的伪码相加生成复合伪码，将接收信号与复合伪码进行圆周相关运算获得最大相关值，将最大相关值通过Teager-Kaiser处理来降低噪声的影响.该方法具有降低捕获时间的同时减小计算量的优点，且通过仿真结果可知，在同虚警的情况下，该算法所应用的TK算法提高了检测概率，最高比直接相关法的检测概率提高了约5 dB. 

Multisatellite Signal Joint Acquisition Algorithm Based on Composite Pseudocode

In order to reduce the first positioning time of Binary Offset Carrier (BOC) modulation signals during cold start, a multi-satellite signal joint acquisition algorithm was proposed based on composite pseudocode to realize the simultaneous acquisition of multiple satellite signals. Firstly, the pseudo-codes corresponding to different satellite signals were added together to generate the composite pseudo-codes. And then the received signals and the composite pseudo-codes were processed with the circle correlation to obtain the maximum correlation value. Finally the maximum correlation value was processed based on Teager-Kaiser to reduce the impact of noise. The simulation results show the advantages of this method, including the reduction of the acquisition time and the calculation amount. Under the same false alarm condition, the TK algorithm applied in this algorithm can improve the detection probability. Compared with the detection probability of direct correlation method, the maximum detection probability of this method can increase about 5 dB.