在相控陣?yán)走_(dá)跟蹤低仰角目標(biāo)時(shí)，采用頻率捷變技術(shù)可以有效地減小雷達(dá)回波中直射信號(hào)和反射信號(hào)的相關(guān)性，抑制多徑效應(yīng)對(duì)目標(biāo)到達(dá)方向估計(jì)造成的影響，提高角度估計(jì)的精度和性能。再用修正的AR模型算法，不僅可以在此基礎(chǔ)上進(jìn)一步去掉這兩種信號(hào)的相關(guān)性，而且能正確估計(jì)出目標(biāo)和鏡像的仰角。計(jì)算機(jī)仿真實(shí)驗(yàn)結(jié)果驗(yàn)證了頻率捷變和修正AR模型算法理論的正確性，以及在與其他方法比較的情況下，兩者結(jié)合在去相關(guān)性能上的優(yōu)越性和工程實(shí)用性。

It is very effective that applying frequency agility to reduce the coherence of the direct and the reflect signal in phased array radar, which are contained in the echo of radar. This method can restrain the influence caused by multipath effect when estimating the target’s direction of arrival (DOA), and improve the precision and ability of angle’s estimation. Then the application of the modified AR model can not only reduce the coherence of the two signals further, but separate the elevations of the target and its image. The simulation results verify the validity of the theory of frequency agility and modified AR model, as well as the advantage and practicability with the combination of two methods when comparing with other methods.