基于批处理和Teager-Kaiser算子的BOC信号联合捕获算法

针对较低信噪比条件下二进制偏移载波信号的捕获问题,提出了一种基于批处理和Teager-Kaiser(TK)算子的联合捕获算法。该方法首先对接收信号和组合扩频码进行批处理和平均处理,并将接收信号转换到频域进行多次循环移位;然后,将得到的最佳频偏补偿序列与组合扩频码进行圆周相关运算得到最大相关值;最后,引入相关峰能量最大值与次大值的比值作为门限判决变量,比较了所提TK算子法、差分相干累积算法和批处理算法的检测概率。仿真结果表明,在同一条件下,TK算子法检测概率比差分相干算法提高了约2dB,比批处理算法提高了约6dB,并减少了捕获时间。

BOC signal combined acquisition algorithm based on batch processing and Teager Kaiser operator

Aiming at the problem of binary offset carrier signal acquisition under low signal noise ratio conditions, a combined acquisition algorithm based on batch processing and Teager Kaiser (TK) operator is proposed. Firstly, the technologies of batch processing and averaging processing are applied for the received signals and combined spreading codes, and the technology of frequency domain multiple circular moving is applied for the received signals. Then, the optimal frequency offset compensation sequence and the combined spreading code take circular correlation operation to obtain a maximum correlation value. Finally, the ratio of the largest peak to the second largest peak is adopted as the threshold decision variable, and the detection probabilities based on TK operator method, differential correlation algorithm and original batch processing algorithm are compared. Simulation results show that, under the same conditions, the detection probabilities of the acquisition algorithm based on TK operator are improved, which is about 2 dB higher than those of the differential coherent accumulation algorithm, about 6 dB higher than those of 〖JP2〗the batch processing algorithm, and effectively〖JP〗 shortens the acquisition time.