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Micro-motion characteristics of the sea corner-reflector jamming and the ship are different. The corresponding time-frequency feature extracted from the time-frequency representation (TFR) of the target echo can be used to discriminate the corner-reflector jamming and the ship. Three parameters, including the micro motion period, the time-frequency spectrum entropy and the maximum of micro-Doppler half-period frequency difference, are applied to describe time-frequency feature of the target. An identification method based on those time-frequency feature parameters is presented to discriminate the corner-reflector jamming and the ship. Experiments with measured data validate the effectiveness of the identification method via time-frequency feature.

The millimeter wave broadband coherent radar has the capabilities of high range resolution and Doppler resolution, which provides a new approach for anti-chaff jamming. Based on the echo model of broadband coherent radar, the range Doppler two-dimensional profile of the target is derived. Then the differences of the range Doppler two-dimensional profile between the echoes of the ship and the chaff jamming are analyzed. A range Doppler two-dimensional extended target detector based on Otsu is applied to detect the target region. Three characteristic parameters based on the range Doppler two-dimensional profile are proposed to discriminate the ship and the chaff jamming. An identification method based on those characteristic parameters is presented to discriminate the chaff jamming and the ship. Experiments with measured data validate the effectiveness of the identification method via range Doppler two-dimensional profile.

As the traditional radar system can't quickly and effectively identify group targets, this paper uses a millimeter-wave radar system to identify, sort and track the sea fleet targets. The radar scans the sea surface firstly to get the DBS image, then the image is processed by the CFAR processor to detect the fleet targets, and finally according to various parameters provided by the INS (inertial navigation system), the positional relationship between the radar and a specific target can be worked out. Then the radar will set the servo system so that the antenna can beam the targets area and then the radar can go to monopulse tracking quickly. The results show that: the system and algorithm proposed by this paper can identify and sort the group targets and track the specific target quickly and steadily. It is suitable for the airborne or missile fields.