一種基于短合成孔徑的雙星干涉精確定位方法
doi: 10.11999/JEIT180940
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1.
西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室 西安 710071
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2.
電子信息控制重點(diǎn)實(shí)驗(yàn)室 成都 610036
A Dual Satellite Interferometric Precise Localization Method Based on Short Synthetic Aperture
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1.
National Laboratary of Radar Signal Processing, Xidian University, Xi’an 710071, China
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2.
Science and Technology on Electronic Information Control Laboratory, Chengdu 610036, China
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摘要:
雙星TDOA/FDOA聯(lián)合定位通過時(shí)差曲面和頻差曲面進(jìn)行定位,定位的精度受時(shí)差/頻差測(cè)量精度的影響。針對(duì)精確測(cè)量時(shí)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(cè)量時(shí)差/頻差的方法,利用一定長(zhǎng)度的合成孔徑提高測(cè)量精度。對(duì)于窄帶信號(hào),該方法有估計(jì)單星多普勒頻率的能力,通過兩顆衛(wèi)星單獨(dú)估計(jì)的結(jié)果得到頻差;對(duì)于寬帶信號(hào),通過雙星數(shù)據(jù)干涉可以獲得頻差的高精度估計(jì)。對(duì)于短期穩(wěn)定的雷達(dá)信號(hào),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。
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關(guān)鍵詞:
- 雙星定位 /
- 短合成孔徑 /
- 雙星干涉 /
- 到達(dá)時(shí)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.
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Key words:
- Dual-satellite localization /
- Short synthetic aperture /
- Dual-satellite interferometry /
- TDOA /
- FDOA
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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(cè)量結(jié)果(Hz) 基頻測(cè)量誤差(Hz) 相對(duì)誤差(Hz) 1.59 10 100 10 –4781.5 33.9742 2.16 1.59 10 100 10 1710.5 31.8189 1.78 10 100 10 –1120.3 40.6852 4.20 1.78 10 100 10 2486.2 36.4891 下載: 導(dǎo)出CSV
表 2 時(shí)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(cè)量位置(m) 相對(duì)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 下載: 導(dǎo)出CSV
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(cè)量位置(m) 相對(duì)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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