用于双星时差频差定位体制的宽频接收机设计

针对双星时差频差定位体制要求,提出了一种宽频带接收机设计方法。介绍了整机架构设计方案和模块划分方法。重点阐述了影响双星时频差体制定位精度的关键指标:时延差一致性、频率差一致性、幅度差一致性的工程实现方式及各项技术指标的加速老化试验方式。接收机测试结果表明,接收机时延差一致性优于1.54 ns、频率差一致性优于1 Hz、幅度差一致性优于0.5 dB。并通过老化试验验证接收机指标变化情况满足在轨5年实际工程应用需求。

A Design of Wide-Band Receiver Based on Dual-Satellite Geolocation System Using TDOA and FDOA

The paper proposes the design of a broadband receiver meeting the dual-satellite TDOA (time difference of arrival) and FDOA (frequency difference of arrival) measurement system requirements. It introduces the receiver structure and module division, mainly including the engineering solutions of time delay difference coherence, frequency difference coherence and amplitude difference coherence affecting location accuracy of the dual-satellite geolocation system and a manner of accelerated aging test for the technical specifications. Measurement results show that the receiver can achieve 1.54 ns time delay difference coherence, 1 Hz frequency difference coherence and 0.5 dB amplitude difference coherence. The change of the receiver specifications proved by the accelerated aging test meets the requirement of 5-year on-orbit practical engineering applications.