基于DOA和TDOI的主瓣掃描輻射源定位方法

張翼飛; 張敏; 郭福成

doi:10.11999/JEIT170141

基于DOA和TDOI的主瓣掃描輻射源定位方法

doi: 10.11999/JEIT170141

2.
(國防科學(xué)技術(shù)大學(xué)電子科學(xué)與工程學(xué)院長沙 410073)

基金項目:

上海航天科技創(chuàng)新基金項目(SAST2015028)

計量
- 文章訪問數(shù): 1082
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-02-21
- 修回日期: 2017-09-18
- 刊出日期: 2017-12-19

Scanning Emitter Localization Using DOA and TDOI Measurements

2.
(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)

Funds:

Shanghai Aerospace Science and Technology Innovation Fund (SAST2015028)

摘要

摘要: 針對具有已知掃描周期特性的輻射源無源定位問題，該文提出一種基于主瓣到達角(DOA)和掃描截獲時間差(TDOI)的聯(lián)合定位體制。通過對其定位誤差的克拉美-羅下限(CRLB)推導(dǎo)，給出了聯(lián)合定位體制的性能與DOA和信號截獲時間(TOI)觀測量的等效測角噪聲功率比的關(guān)系。為了利用非線性聯(lián)合觀測量確定掃描輻射源的位置，通過將TDOI觀測量轉(zhuǎn)換成等效DOA觀測量，給出一種加權(quán)偽線性最小二乘(WPLS)定位方法；為消除觀測矩陣相關(guān)噪聲導(dǎo)致的WPLS估計偏差，提出了一種加權(quán)輔助變量(WIV)定位方法，算法復(fù)雜度約為WPLS算法的2倍。仿真結(jié)果表明，WIV方法的定位誤差在輻射源單個掃描周期內(nèi)即可達到CRLB，定位性能與極大似然(ML)定位方法相當(dāng)；隨著觀測次數(shù)的增多，WIV方法可以漸近達到無偏估計。
- 無源定位 /
- 機械掃描 /
- 到達角 /
- 截獲時間差 /
- 最小二乘
Abstract: The determination of the scanning emitter position with known scan rate using Direction Of Arrival (DOA) and Time Difference Of Interception (TDOI) is investigated. The Cramr-Rao Lower Bound (CRLB) of the DOA and TDOI based localization regime is firstly derived. It demonstrates that the equivalent DOA measurements noise power ratio of the individual regime is closely related to the improvement of the combination regime. To exclusively determine the position of the scanning emitter, the TOI measurements are transformed to the corresponding DOA measurements and then a Weighted Pseudo-linear Least Square (WPLS) estimator is proposed. However, the WPLS is biased due to the noise correlation between the regressor and regressand of the pseudo-linear equation. The Instrumental Variable (IV) method is resorted to eliminate the bias caused by the WPLS, and a Weighted IV (WIV) estimator, at the cost of two times computational complexity of the WPLS, is proposed. Simulations show that the WIV performs approximately to the Maximum Likelihood (ML) estimator. It can reach the CRLB in one scan cycle, and is asymptotic unbiased within multiple cycles.
- Passive localization /
- Mechanical scanning /
- Direction Of Arrival (DOA) /
- Time Difference Of Interception (TDOI) /
- Least Squares (LS)

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