CAJ | 학술논문

在米波雷达低仰角测高中，由于直达波和相干多径信号都在天线波束的主瓣之内，导致测高精度低。约束 MUSIC 算法利用已知的信源方向来提高未知信源估计精度，而且不受信源相干的影响。将该算法应用于米波雷达低仰角测高中，将多径信号作为约束来提高直达波的估计精度，提出一种广义约束 MUSIC 算法，并结合雷达测高的特点对其进行改进，计算机仿真结果证实改进算法在保持良好性能的同时能降低运算量。
재미파뢰체저앙각측고중，유우직체파화상간다경신호도재천선파속적주판지내，도치측고정도저。약속 MUSIC 산법이용이지적신원방향래제고미지신원고계정도，이차불수신원상간적영향。장해산법응용우미파뢰체저앙각측고중，장다경신호작위약속래제고직체파적고계정도，제출일충엄의약속 MUSIC 산법，병결합뢰체측고적특점대기진행개진，계산궤방진결과증실개진산법재보지량호성능적동시능강저운산량。
The multi-path signal and the direct signal, lying within a beamwidth of the receiving antenna, are highly correlated, which cause badly effect to the performance of low-angle altitude measurement for very high frequency ( VHF) radar. Constrained MUSIC improves the estimation precision of unknown source directions by incorporating the prior known source directions. A generalized constrained MUSIC was proposed, which was modified in terms of the low-angle environment of VHF radar. It improved the estimation precision of direct signal with multi-path signal as a constraint. According to the characteristic of altitude measurement, some improvement was made on the proposed algorithm. Simulation results demonstrated that the proposed methods could reduce computation complexity and get good performances.