Zengping Zengping Chen

An Experimental Study of Passive Bistatic Radar Using Uncooperative Radar as a Transmitter

This letter proposes a signal processing method of passive bistatic radar (PBR) exploiting an uncooperative radar as an illuminator. Compared with other opportunity illuminators, the transmitting signal of a radar usually has a better ambiguity function, which leads to a higher range resolution. Two channels are needed in PBR system. The reference channel is used to estimate radar signal parameters and reconstruct directly propagated signal. The surveillance channel is used to receive scattered wave. An array antenna and a simultaneous multibeam algorithm are necessary in the surveillance channel due to the flexible beam scanning of the uncooperative radar. The procedure of the proposed method is explained in detail, which is then followed by a field experiment. Preliminary results from the field experiment show that the proposed method can be applied to target angle and bistatic range measurement successfully.

Acoustic Radar Weak Target Detection Method Based on Mellin Transform

Acoustic radar has the advantages of low cost, high resolution, and the simplicity for sampling and storage. Recent years, it has been widely studied and applied in fields such as target detection, recognition and imaging. However, the sound signal is usually wideband. The wideband correlation function is often used in active and passive detections. To address the problems of the errors and computational burden introduced by approximation and the interpolation of signal dilation, a Mellin transform based multi-pulse weak target detection method is proposed. The method can reduce the Mellin sampling numbers and the detection result can be updated pulse by pulse.

Analysis of Anisotropic Scattering of Aircraft Engine Blades in Micro-Doppler Signature

Due to the fast rotational motion and skewed geometry of the blades, the Micro-Doppler (m-D) patterns of the aircraft rotating blades in measured data usually do not consistent with the expected m-D pattern via ideal point-scatterer model. In this paper, the backscatter field of the rotating blades is investigated based on the physical optic method, and anisotropic scattering behavior of the aircraft blades which is ignored in ideal point-scatterer model is predicted in the m-D signature. These conclusions in this paper will be useful for the m-D analysis and further high-quality m-D extraction techniques of aircraft rotating blades.