一种基于短合成孔径的双星干涉精确定位方法

孙光才; 王裕旗; 高昭昭; 江帆; 邢孟道; 保铮

doi:10.11999/JEIT180940

一种基于短合成孔径的双星干涉精确定位方法

doi: 10.11999/JEIT180940

1.
西安电子科技大学雷达信号处理国家重点实验室西安 710071
2.
电子信息控制重点实验室成都 610036

基金项目: 电子信息控制重点实验室基金(20170105)

详细信息

作者简介:
孙光才：男，1984年生，博士，副教授，研究方向为合成孔径雷达成像和动目标检测

王裕旗：男，1994年生，博士生，研究方向为合成孔径雷达成像

高昭昭：男，1982年生，博士，高级工程师，研究方向为雷达信号处理和毫米波无源成像探测

江帆：女，1988年生，博士，高级工程师，研究方向为阵列信号处理与微波光子

邢孟道：男，1975年生，博士，教授，研究方向为雷达成像和目标检测与识别

保铮：男，1927年生，中国科学院院士，研究方向为雷达系统与雷达信号处理、动目标检测、阵列信号处理、空时自适应信号处理等

通讯作者:
孙光才　rsandsgc@126.com

中图分类号: TN958
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出版历程
- 收稿日期: 2018-10-09
- 修回日期: 2019-07-18
- 网络出版日期: 2019-09-17
- 刊出日期: 2020-02-19

A Dual Satellite Interferometric Precise Localization Method Based on Short Synthetic Aperture

1.
National Laboratary of Radar Signal Processing, Xidian University, Xi’an 710071, China
2.
Science and Technology on Electronic Information Control Laboratory, Chengdu 610036, China

Funds: The Foundation of Science and Technology on Electronic Information Control Laboratory (20170105)

摘要

摘要:
双星TDOA/FDOA联合定位通过时差曲面和频差曲面进行定位，定位的精度受时差/频差测量精度的影响。针对精确测量时差/频差的需求，该文提出一种基于短合成孔径的双星干涉测量时差/频差的方法，利用一定长度的合成孔径提高测量精度。对于窄带信号，该方法有估计单星多普勒频率的能力，通过两颗卫星单独估计的结果得到频差；对于宽带信号，通过双星数据干涉可以获得频差的高精度估计。对于短期稳定的雷达信号，STK仿真数据的处理结果证实了该方法在大范围内可以实现1 km的定位精度。
- 双星定位 /
- 短合成孔径 /
- 双星干涉 /
- 到达时差 /
- 到达频差
Abstract:
Dual satellite TDOA/FDOA localization is achieved by the TDOA hyperboloid and FDOA hyperboloid. The accuracy of localization is affected by TDOA/FDOA accuracy. In order to measure accurately the TDOA/FDOA, a method of TDOA/FDOA measurement based on short synthetic aperture is presented. This method improves the measurement accuracy by using a certain length of synthetic aperture. For narrowband signals, the method has the ability to estimate a single satellite Doppler frequency, and the frequency difference can be obtained from the results estimated by the two satellites. For wideband signals, high-precision estimates of frequency differences can be obtained by dual satellite data interference. For short-term stable radar signals, the processing results of STK simulation data confirm the effectiveness of the proposed method.
- Dual-satellite localization /
- Short synthetic aperture /
- Dual-satellite interferometry /
- TDOA /
- FDOA

HTML全文

图 1 双星信号模型

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图 2 频差测量算法流程

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图 3 双星定位模型

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图 4 有噪声的情况下干涉的相位图

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图 5 某个脉冲距离向剖面图

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图 6 LFM信号频差均方误差值随信噪比变化

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图 7 单频信号频差均方误差值随信噪比变化

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图 8 时差均值随信噪比的变化

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图 9 双星时差频差定位的GDOP (km)

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表 1 STK仿真数据处理结果

载频(GHz)	脉宽(μs)	脉冲重复周期(μs)	带宽(MHz)	基频测量结果(Hz)	基频测量误差(Hz)	相对误差(Hz)
1.59	10	100	10	–4781.5	33.9742	2.16
1.59	10	100	10	1710.5	31.8189	2.16
1.78	10	100	10	–1120.3	40.6852	4.20
1.78	10	100	10	2486.2	36.4891	4.20

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表 2 时差频差定位结果

载频(GHz)	脉宽(μs)	脉冲重复周期(μs)	带宽(MHz)	目标真实位置(m)	目标测量位置(m)	相对误差(m)
1.59	10	100	10	(6303534, –92215, 968286)	(6303532, –92876, 968234)	662
1.59	10	100	10	(6348796, –27959, 610439)	(6348797, –27448, 610446)	510
1.78	10	100	10	(6339522, –16218, 700588)	(6339520, –16829, 700590)	611
1.78	10	100	10	(6374947, 30978, 199294)	(6374945, 30530, 199409)	462

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表 3 常规方法定位结果

目标真实位置(m)	目标测量位置(m)	相对误差(m)
(6303534, –92215, 968286)	(6303808, –91936, 970069)	1825
(6348796, –27959, 610439)	(6348976, –28173, 612353)	1935
(6339522, –16218, 700588)	(6339615, –16496, 701470)	930
(6374947, 30978, 199294)	(6374905, 30788, 198028)	1280

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