用于无源雷达的SiriusXM卫星信号中的帧致多普勒自模糊

中文摘要 AI 辅助

卫星数字音频无线电服务（SDARS）信号因其连续的地球静止轨道覆盖和相对较高的有效辐射功率，成为无源雷达的理想机会照射源。然而，这些波形采用的确定性时分复用（TDM）帧结构引入了固有的自模糊，这可能限制相干积分和检测性能。本文分析了XM/SiriusXM（SXM）波形的自模糊函数（SAF），并明确将观察到的多普勒周期性归因于TDM主帧中嵌入的快速同步前导码（FSP）的重复。使用帧精确的XM TDM信号仿真来建立预期的模糊行为，随后利用从SXM-8卫星收集的真实直达路径数据进行了实验验证。结果表明，在XM FSP重复频率的整数倍处存在显著且持续的多普勒复制，形成确定性的多普勒“梳状”（栅瓣结构），其跨越的多普勒范围与基于地球静止轨道（GEO）的无源雷达操作相关，且相干处理间隔长达数秒。

英文摘要

Satellite Digital Audio Radio Service (SDARS) signals are attractive illuminators of opportunity for passive radar due to their continuous geostationary coverage and relatively high effective radiated power. However, the deterministic time-division multiplexed (TDM) framing employed by these waveforms introduces inherent self-ambiguity that can constrain coherent integration and detection performance. This paper analyzes the self-ambiguity function (SAF) of the XM/SiriusXM (SXM) waveform and explicitly links the observed Doppler periodicity to the repetition of the fast synchronization preamble (FSP) embedded in the TDM master frame. A frame-accurate XM TDM signal simulation is used to establish the expected ambiguity behavior, which is then validated experimentally using real direct-path data collected from the SXM-8 satellite. Results demonstrate pronounced and persistent Doppler replicas at integer multiples of the XM FSP repetition frequency, forming a deterministic Doppler ``comb'' (grating-lobe structure) that spans Doppler extents relevant to GEO-based passive radar operation with multi-second coherent processing intervals.

发表机构

• Department of National Defence, Defence Research and Development Canada（国防部，加拿大国防研究与开发局）

机构由 AI 辅助整理，请以论文原文为准。