一種基于短合成孔徑的雙星干涉精確定位方法

孫光才; 王裕旗; 高昭昭; 江帆; 邢孟道; 保錚

doi:10.11999/JEIT180940

一種基于短合成孔徑的雙星干涉精確定位方法

doi: 10.11999/JEIT180940 cstr: 32379.14.JEIT180940

1.
西安電子科技大學(xué)雷達(dá)信號處理國家重點(diǎn)實(shí)驗室西安 710071
2.
電子信息控制重點(diǎn)實(shí)驗室成都 610036

基金項目: 電子信息控制重點(diǎn)實(shí)驗室基金(20170105)

詳細(xì)信息

作者簡介:
孫光才：男，1984年生，博士，副教授，研究方向為合成孔徑雷達(dá)成像和動目標(biāo)檢測

王裕旗：男，1994年生，博士生，研究方向為合成孔徑雷達(dá)成像

高昭昭：男，1982年生，博士，高級工程師，研究方向為雷達(dá)信號處理和毫米波無源成像探測

江帆：女，1988年生，博士，高級工程師，研究方向為陣列信號處理與微波光子

邢孟道：男，1975年生，博士，教授，研究方向為雷達(dá)成像和目標(biāo)檢測與識別

保錚：男，1927年生，中國科學(xué)院院士，研究方向為雷達(dá)系統(tǒng)與雷達(dá)信號處理、動目標(biāo)檢測、陣列信號處理、空時自適應(yīng)信號處理等

通訊作者:
孫光才　rsandsgc@126.com

中圖分類號: TN958
計量
- 文章訪問數(shù): 2910
- HTML全文瀏覽量: 945
- PDF下載量: 101
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2018-10-09
- 修回日期: 2019-07-18
- 網(wǎng)絡(luò)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:
雙星TDOA/FDOA聯(lián)合定位通過時差曲面和頻差曲面進(jìn)行定位，定位的精度受時差/頻差測量精度的影響。針對精確測量時差/頻差的需求，該文提出一種基于短合成孔徑的雙星干涉測量時差/頻差的方法，利用一定長度的合成孔徑提高測量精度。對于窄帶信號，該方法有估計單星多普勒頻率的能力，通過兩顆衛(wèi)星單獨(dú)估計的結(jié)果得到頻差；對于寬帶信號，通過雙星數(shù)據(jù)干涉可以獲得頻差的高精度估計。對于短期穩(wěn)定的雷達(dá)信號，STK仿真數(shù)據(jù)的處理結(jié)果證實(shí)了該方法在大范圍內(nèi)可以實(shí)現(xiàn)1 km的定位精度。
- 雙星定位 /
- 短合成孔徑 /
- 雙星干涉 /
- 到達(dá)時差 /
- 到達(dá)頻差
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

圖 1 雙星信號模型

下載: 全尺寸圖片幻燈片

圖 2 頻差測量算法流程

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圖 3 雙星定位模型

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圖 4 有噪聲的情況下干涉的相位圖

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圖 5 某個脈沖距離向剖面圖

下載: 全尺寸圖片幻燈片

圖 6 LFM信號頻差均方誤差值隨信噪比變化

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圖 7 單頻信號頻差均方誤差值隨信噪比變化

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圖 8 時差均值隨信噪比的變化

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圖 9 雙星時差頻差定位的GDOP (km)

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表 1 STK仿真數(shù)據(jù)處理結(jié)果

載頻(GHz)	脈寬(μs)	脈沖重復(fù)周期(μs)	帶寬(MHz)	基頻測量結(jié)果(Hz)	基頻測量誤差(Hz)	相對誤差(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 時差頻差定位結(jié)果

載頻(GHz)	脈寬(μs)	脈沖重復(fù)周期(μs)	帶寬(MHz)	目標(biāo)真實(shí)位置(m)	目標(biāo)測量位置(m)	相對誤差(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 常規(guī)方法定位結(jié)果

目標(biāo)真實(shí)位置(m)	目標(biāo)測量位置(m)	相對誤差(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

下載: 導(dǎo)出CSV

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