机载多载频频控阵非均匀距离模糊杂波抑制方法

doi:10.12305/j.issn.1001-506X.2024.02.10

Abstract

Abstract:

The looking-down mode of the airborne radar faces serious low-sea clutter, and the Doppler frequency of clutter spreads seriously due to the movement of radar platform, which will completely submerge the weak target. Space-time adaptive processing (STAP) technology can effectively suppress clutter and realize moving target detection by combining the received signals of multi-antenna pulses. For non-side-looking array high-speed platform radar, clutter range dependence and range ambiguity seriously restrict the performance of target detection. In this paper, based on the multi-carrier frequency control array, by transmitting a group of orthogonal signals with different carrier frequencies, a new degree of freedom of the transmit dimension is obtained in the clutter echo, and the range-ambiguous regions are separated according to the difference of distinct ambiguities in the transmit dimension. In addition, by further compensating the short-range clutter after separation, a reduced-dimensional STAP is used to mitigate the clutter. Simulation results verify the effectiveness of the proposed method.

Key words: space-time adaptive processing (STAP), range ambiguity, multi-carrier frequency control array, inhomogeneous clutter

CLC Number:

TN958.5

Cheng LIU, Huake WANG, Yinghui QUAN, Guisheng LIAO. Non-uniform distance ambiguity clutter suppression method for airborne multi-carrier frequency control array[J]. Systems Engineering and Electronics, 2024, 46(2): 459-469.

Figures/Tables 11

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参数名	数值	参数名	数值
载频f₀/GHz	5	相干脉冲数K	20
训练样本数L	300	脉冲持续时间T_p/μs	10
接收阵元间d_R/m	0.03	距离模糊数P	4
平台运动速度v_p/(m/s)	150	距离分辨率ΔR/m	20
平台高度H/km	6	频率增量Δf/kHz	2.5
脉冲重复频率f_r/kHz	10	目标距离R₀/km	12
发射波形数M	8	目标水平角θ₀/(°)	90
接收阵元数N	16	目标俯仰角φ₀/(°)	30.06

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Non-uniform distance ambiguity clutter suppression method for airborne multi-carrier frequency control array

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