基于时差频差的直接定位方法

Direct positioning method based on time difference and frequency difference

Abstract

The invention discloses a direct positioning method based on time difference and frequency difference. In view of a passive dual-satellite time difference and frequency difference positioning problem, the invention discloses a positioning method of firstly determining a target position range based on TDOA (Time Difference Of Arrival) and then based on a FDOA (Frequency Difference Of Arrival) model, the FDOA does not need to be measured, the difficulty of solving the time difference and the frequency difference is avoided, and the positioning precision is higher than that in a method of firstly measuring the FDOA and then performing positioning. Compared with the method of firstly measuring the time difference and the frequency difference and then performing positioning, the method of the invention has the advantages of simple processing and high positioning precision, and particularly in a condition of a low signal to noise ratio, the positioning precision has large advantages. The method does not need to change hardware design of the positioning system only needs to adopt a new positioning algorithm and is applied to engineering application and promotion. The dual-satellite time difference and frequency difference positioning precision can be improved, and a certain reference value is provided for positioning of other platforms and other positioning mechanisms.
本发明公开了一种基于时差频差的直接定位方法,本发明针对无源双星时差频差定位问题,公开了一种先基于TDOA确定目标位置范围,再基于FDOA模型的定位方法,无需测量FDOA,避免了求解时差频差的困难,定位精度优于传统先测FDOA再进行定位的方法;本发明的方法相对先测时差频差再进行定位的方法,具有处理简单,定位精度高的优点,尤其在信噪比低条件下,定位精度优势较大;本方法无需改动定位系统硬件设计,只需要采取新的定位算法,适于工程应用推广;本发明可提高双星时差频差定位精度,同时对其它平台、其它定位体制的定位具有一定的参考价值。

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    Title
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