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针对长周期伪码信号捕获中时频域的不确定问题,在理论模型分析的基础上,提出了一种长周期伪码捕获算法。该算法对接收信号进行时域混频及叠加处理,并转换到频域进行多次圆周移动,从而克服频偏引发的相关峰不确定问题;同时,通过连续积累和批处理手段克服了收发钟差引发的伪码时间不确定问题和信息翻转引发的相关峰不确定问题。理论分析和仿真结果表明:该算法在信噪比大于-25dB的条件下,可以克服时频域的不解定问题;进一步,该算法与传统算法进行了比较,处理精度及处理复杂度都优于传统算法。
Aiming at the uncertainty of time-frequency domain in long-period pseudo-code signal acquisition, a long-period pseudo-code acquisition algorithm is proposed based on theoretical model analysis. The algorithm performs time-domain mixing and superposition on the received signal and transforms to the frequency domain for multiple circular movements to overcome the uncertainty of the correlation peak caused by the frequency offset. At the same time, the algorithm overcomes the problem of sending and receiving clocks by means of continuous accumulation and batch processing Poorly-triggered pseudocode time uncertainty and correlated peak uncertainty caused by information flipping. Theoretical analysis and simulation results show that the proposed algorithm can overcome the problem of indeterminacy in time-frequency domain under the condition that the signal-noise ratio is greater than-25dB. Furthermore, compared with the traditional algorithm, this algorithm is superior in processing accuracy and processing complexity In the traditional algorithm.