發(fā)布時間：2018-06-28 16:22

  本文選題：無源定位 + 機械掃描��； 參考：《電子與信息學報》2017年12期

【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,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觀測量轉換成等效DOA觀測量,給出一種加權偽線性最小二乘(WPLS)定位方法;為消除觀測矩陣相關噪聲導致的WPLS估計偏差,提出了一種加權輔助變量(WIV)定位方法,算法復雜度約為WPLS算法的2倍。仿真結果表明,WIV方法的定位誤差在輻射源單個掃描周期內即可達到CRLB,定位性能與極大似然(ML)定位方法相當;隨著觀測次數(shù)的增多,WIV方法可以漸近達到無偏估計。
[Abstract]:To solve the problem of passive location of emitter with known scanning period, a joint location scheme based on the principal lobe arrival angle (DOA) and scanning intercept time difference (TDOI) is proposed in this paper. The relationship between the performance of the joint positioning system and the equivalent angle-noise power ratio of DOA and TOI observations is given through the derivation of the Cramey-Row lower bound (CRLB) of the positioning error. A weighted pseudolinear least squares (WPLS) localization method is proposed by converting TDOI observations into equivalent DOA observations to determine the location of scanning emitter using nonlinear joint observations. In order to eliminate the WPLS estimation bias caused by the correlated noise of the observation matrix, a weighted auxiliary variable (WIV) localization method is proposed. The complexity of the algorithm is about twice that of the WPLS algorithm. The simulation results show that the location error of the WIV method can reach CRLBwithin a single scanning period of the emitter, and the localization performance is equivalent to that of the maximum likelihood (ML) method, and the WIV method can achieve asymptotic unbiased estimation with the increase of the number of observations.
【作者單位】： 火箭軍工程大學信息工程系;國防科學技術大學電子科學與工程學院;
【基金】：上海航天科技創(chuàng)新基金項目(SAST2015028)~~
【分類號】：TN95

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本文編號：2078609