CAJ | 학술논문

现有提取一维距离像尺寸的方法是在宽带去斜后采用FFT，再进行CFAR检测提取散射点并估计尺寸．由于弹道目标的散射点强度相差较大，直接用FFT方法会导致大散射点旁瓣掩盖小散射点，而引起尺寸估计不准；加窗后作FFT再估计散射点和尺寸又有信噪比损失．为此提出采用RELAX算法，逐次估计散射点的位置和幅度，去除了大散射点旁瓣的影响，又没有信噪比损失．基于RCS计算数据的仿真结果表明，该方法对目标尺寸估计精度至少提高了0.3 m，满足一般信噪比条件下识别真假弹头的要求．
현유제취일유거리상척촌적방법시재관대거사후채용FFT，재진행CFAR검측제취산사점병고계척촌．유우탄도목표적산사점강도상차교대，직접용FFT방법회도치대산사점방판엄개소산사점，이인기척촌고계불준；가창후작FFT재고계산사점화척촌우유신조비손실．위차제출채용RELAX산법，축차고계산사점적위치화폭도，거제료대산사점방판적영향，우몰유신조비손실．기우RCS계산수거적방진결과표명，해방법대목표척촌고계정도지소제고료0.3 m，만족일반신조비조건하식별진가탄두적요구．
The existing extraction method for one-dimensional range profile size is to use the FFT after de-sloping in wide band, to perform the CFAR detection for extracting the scattering points and estimate the size. As the scattering pints’intensity of the ballistic targets has bigger difference, using directly the FFT method can give rise to the large scattering points’side-lobe covering up those small scattering points, resulting in inaccuracy of size estimation, while doing FFT after windowing and re-estimating the scattering points and their size cause the SNR loss. This paper proposes to use the RELAX algorithm, estimate sequentially the position and amplitude of scattering points, and wipe out the influences of the big scattering points while having no loss of the SNR. Simulation results based on RCS calculating data indicate that the estimation precision of the target’s size can be increased at least by 0.3 m, which meets the requirements for recognizing the true-false warheads under the circumstance of common SNR.