Design of airborne adaptive recursive MTI filter for detecting targets of slow speed

Abstract

Owing to the narrow distance in Doppler fiequency domain between slow speed targets and ground clutter, it is difficult to suppress effectively clutter without attenuating target signals. A solution is adopting the recursive MTI filter. This paper presents a flexible design method of this kind of filter. It not only adaptively adjusts filter parameters according to real clutter condition, but also can prevent slow speed targets fiom attenuation. A simulation example proves the effectiveness of the design method.

Airborne Radar Staggered PRF Coherent Processing Method for Down-Looking Target Detection

“…1, When s k,n,FC t, fr,n > T 1 0, When s k,n,FC t, fr,n ≤ T 1 (25) Equation ( 24) is hereby revised as follows:…”

“…In addition, to detect low-speed targets on the ground, such as trucks and tanks, the MTI filter must have a wide enough passband and steep transition band. Huang Yong et al [25] proposed a flexible filter design method that can not only adaptively adjust the filter parameters according to the actual clutter conditions, but also prevent the attenuation of slow-moving targets. A new method based on "filter-then-adapt" was proposed in [26] for single-channel airborne radar.…”