同源多码流直接序列扩频信号性能分析
doi: 10.3724/SP.J.1146.2011.00718
Performance Analysis of Multiple SS-DS Transmitted by Single Radiator
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摘要: 新一代GPS系统加入了二相偏移载波(BOC)调制信号。相对GPS传统PSK-R信号，BOC信号具有更多的高频分量，在抗干扰性能、码跟踪精度、频谱利用和给定带宽条件下的多信号复用诸方面获得改善和提高。该文分析提出，GPS传统C/A码和P(Y)码信号做为整体时具有与BOC信号相似的特性。该文将其推广到一般化同源多码流信号，分析表明，可以将同源多码流信号作为新信号形式联合处理，以在白噪声和人为干扰具主导作用环境提高码跟踪性能。该文得出两种经典信号谱型条件下，以信号参数表示的码跟踪误差改善的表达式并给出了实现3 dB码跟踪性能改善的参数数值。Abstract: The modernization GPS system employes new Binary Offset Carrier (BOC) modulations, which achieve high performance in anti-jamming and code tracking. BOC modulations can be write as a sum of two coding signals. This can be generalized as multiple Spread Spectrum Direct Sequence (SS-DS) modulations transmitted by single radiator. This paper suggest that multiple spread spectrum signals should be processed as a new single signal for achieving high performance in anti-jamming and code tracking. Expression for error of code tracking is given in terms of signal parameters. Values of signal parameters for 3 dB outperform in code tracking are given finally.
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