基于LFM信号的分布式空间动平台定位技术

Locating distributed moving space platforms based on LFM signals

提出了一维测距结合二维测向的分布式空间动平台间相对定位方法。根据宽带正负斜率线性调频(linear frequency modulation,LFM)信号的时频特性,结合微波双向技术实现了动平台间的相对距离测量,并提出了测频率解相位模糊的短基线干涉仪高精度测向方法,解决了传统多基线干涉仪测角模型的概率性解模糊问题,同时对平台相对运动引起的多普勒干扰进行有效抑制。最终通过评估系统对该方法的定位精度进行了有效验证。

A method combining distance and direction measurement which could realize relative location between moving space platforms is proposed. With the characteristic of wide-band chirp up and chirp down linear frequency modulation （LFM） signals, the distance is measured using the microwave two-way technology, the phase ambiguity while direction finding is solved through frequency measurement, and solved the ambiguity resolution probabilistic of the traditional multi-baseline interferometer angle measurement model, the Doppler Effect caused by relative movement is efficiently depressed also.The positioning accuracy is validated with the evaluation system.