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中文摘要：
卫星信号在复杂环境中功率存在衰减,导致其低于接收机正常捕获范围,给信号捕获带来较大困难。在分析北斗B1频点信号体制及研究码并行捕获算法基础上,提出了针对北斗B1 QPSK调制信号的双通道并行搜索捕获算法,设计了优化的相干、非相干码并行捕获算法,解决了信噪比较低环境中北斗卫星信号捕获困难的问题。利用卫星信号模拟器产生的仿真信号对双通道并行捕获算法和相干、非相干累加捕获算法进行验证与分析,结果表明,前者性能明显优于单通道捕获,后者较普通捕获算法具有更理想的捕获灵敏度。
英文摘要：
The rapidly attenuation of GNSS（Global Navigation Satellite System） signal intensity in complex environments will bring difficulties to signal acquisition because of the weakness of the signal.After analysis of BeiDou B1 signal structure and basis characteristics,and studies of code-parallel acquisition method,dual-channel parallel acquisition algorithm for QPSK-modulate BeiDou B1 signal is performed.Based on which,optimized coherent and incoherent code-parallel algorithm for high-sensitivity acquisition is produced,which solve the problem of acquiring weak signal of BeiDou navigation system.The final experiments are tested by simulated signals generated by satellite simulator.The test results demonstrate that the performance of dual-channel parallel acquisition algorithm is better than single-channel algorithm,and the coherent and incoherent code-parallel acquisition algorithm can perform higher sensitivity than normal code-parallel acquisition algorithm.
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