Guoyu Wang

Signature Extraction From Rotating Targets Based on a Fraction of HRRPs

Motion or structure signatures, extracted from radar echoes, are of great potential in target identification. Traditional techniques for signature extraction rely primarily on the assumption that the time series of the signal contains at least one oscillation or more during the illumination time. However, as many applications involve short duration signals or long duration signals, they are only partially useful in real-world scenarios. The conventional signature extraction algorithms may suffer from degraded precision. This paper presents a three-point model for signature extraction availing the characteristics of the high resolution range profiles (HRRPs) of rotating targets with stepped-frequency signal (SFS). The frequency and the length of rotating targets can be estimated accurately from a fraction of the HRRPs in slow-time-range plane. The accuracy and efficiency of the estimation are demonstrated by simulated and experimental trials.

Equivalent simulation method for pulse radar countermeasure in RFS

Vulse radar signal is widely used in radar countermeasure and detection. When pulse radar signal is adopted in radio frequency simulation (RFS) for radar countermeasure, the target echo will return before the pulse signal is totally transmitted because the size of anechoic chamber is small. The reflected signal and transmitted signal will be coupling and the radar countermeasure cannot be implemented. In this paper, the interrupted transmitting and receiving (ITR) method is adopted to solve the coupling between transmitted and reflected signal. The equivalent simulation method for radar countermeasure and detection is proposed. Then, the processing and detection results of ITR echo and complete pulse radar echo with typical convolution noise jamming are both compared and analyzed. Simulations are conducted to indicate that the detection results of ITR echo are identical with those obtained by the complete pulse echo in the same jammer to signal ratio (JSR). Therefore, the proposed simulation method is effective and applicable.

Multiple false-targets for countering ISAR based on sub-Nyquist sampling

The scatter-wave jamming (SWJ) can form false-target images and the repeater jamming based on sub-Nyquist sampling can produce fake point scatterers in the down-range. In this paper, it will be revealed that sub-Nyquist sampling intrinsically paves a method to generate multiple false-target images combined with SWJ. Radar pulses are under-sampled and retransmitted to the moving target which needs to be protected. It is demonstrated that deceptive false-target images will be induced after the target scatters the jamming signal back to the radar under the principles of bistatic ISAR configuration. A simulated telecommunication satellite model is adopted as the target which needs protection to verify the effectiveness of the jamming idea.