發(fā)布時(shí)間：2018-05-21 06:08

  本文選題：徑向加速度 + 非平穩(wěn)信號(hào)�。� 參考：《北京航空航天大學(xué)學(xué)報(bào)》2015年01期

【摘要】：加速度會(huì)使目標(biāo)回波信號(hào)的頻譜展寬甚至偏移,使傳統(tǒng)脈沖雷達(dá)測(cè)速方法不能準(zhǔn)確估計(jì)信號(hào)的多普勒頻率.為了克服目標(biāo)的加速度對(duì)脈沖雷達(dá)測(cè)速的影響,提出了一種基于經(jīng)驗(yàn)小波變換(EWT)的徑向加速度估計(jì)算法.對(duì)回波信號(hào)進(jìn)行EWT變換和能量型頻率主成分提取方法得到回波信號(hào)瞬時(shí)頻率,并利用抗差最小二乘擬合得到相位高階系數(shù),進(jìn)而估計(jì)目標(biāo)徑向加速度.利用估計(jì)的加速度對(duì)信號(hào)頻譜進(jìn)行補(bǔ)償就能準(zhǔn)確估計(jì)信號(hào)的多普勒頻率.仿真表明EWT方法是一種高精度快速算法,且估計(jì)誤差最接近待估參數(shù)的C-R下界.實(shí)測(cè)高速飛行器脈沖雷達(dá)I/Q數(shù)據(jù)驗(yàn)證表明,EWT算法估計(jì)的加速度精度優(yōu)于0.4 m/s2.該算法可應(yīng)用于脈沖雷達(dá)實(shí)時(shí)加速度估計(jì).
[Abstract]:Acceleration will widen or even offset the frequency spectrum of the target echo signal, so the traditional pulse radar velocimetry method can not accurately estimate the Doppler frequency of the signal. In order to overcome the effect of target acceleration on pulse radar velocimetry, a radial acceleration estimation algorithm based on empirical wavelet transform (EWT) is proposed. The instantaneous frequency of echo signal is obtained by EWT transform and principal component extraction of energy type frequency, and the phase higher order coefficient is obtained by robust least square fitting, and the radial acceleration of target is estimated. The Doppler frequency of the signal can be accurately estimated by compensating the signal spectrum with the estimated acceleration. Simulation results show that the EWT method is a fast algorithm with high accuracy and the estimation error is the closest to the C-R lower bound of the parameters to be estimated. The I / Q data of the measured high-speed aircraft pulse radar show that the acceleration accuracy of the EWT algorithm is better than that of 0.4 m / s ~ (2). This algorithm can be applied to real-time acceleration estimation of pulse radar.
【作者單位】： 北京跟蹤與通信技術(shù)研究所;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61101070) 總裝備部預(yù)先研究資助項(xiàng)目
【分類號(hào)】：TN957.51

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本文編號(hào)：1918057