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This paper considers the localization of an emitter with an unknown linear frequency modulation (LFM) signal in the passive radar systems based on the direct position determination (DPD) method. To improve the localization accuracy, a novel strategy, wherein the position of the emitter and the unknown transmitted signal are jointly estimated, is proposed. As a result, a six-dimensional estimation...
This paper considers an effective signaling scheme to combat the range repeat jammer for radar system. Robustness against jammer is achieved by designing different phase-coded pulses with weighted auto- and cross- correlation in a coherent processing interval (CPI). In this way, the matched filter output forms notches around the true target so that the true target can be indicated clearly. In the...
This paper considers a radar system capable of adaptively adjusting its transmitted waveform, by which the system is able to dynamically mitigate the interference of the clutter, thus improve the detection performance. The key feature of the adaptive mechanism is the optimum waveform design, which is a complex multi-dimension optimizing problem and such a problem in this particular application has...
Coded pulse compression waveforms with matched filtering suffer from range sidelobe interferences. In this paper, we consider the estimating technique with side lobe suppression capability known as the linear minimum mean square error (LMMSE) based reiterated filtering, i.e. the adaptive pulse compression (APC). We derive the theoretical amplitude probability density function (PDF) of the APC estimation...
This paper considers the unit energy phase-modulated (PM) waveform design in communications and radar. For a given scenario, the weighted integrated sidelobe level (WISL) of a waveform is often used as a metric to evaluate the performance of a system. The waveform design with the minimization of the WISL as the criteria is a high dimension search problem and the classical solution for the multi-dimension...
This paper mainly addresses the through-wall life-sign detection with the low signal-to-noise ratio in the Gaussian background. A novel detection approach based on fourth-order cumulant is proposed to extract the weak life-sign such as human breathing. First, MTI is adopted to reduce the zero-frequency clutters including wall echoes. Then, according to the characteristic of suppression for Gaussian...
We deal with the performance prediction of the conventional cell-averaging constant false alarm rate (CA-CFAR) detector in the presence of non-independent identically distributed (non-iid) target backscattered echoes. Accounting for the generalized Swerling-Chi fluctuation target model, we develop the analytical expressions for the target detection probability for CA-CFAR detector. Finally, we assess...
This paper mainly deals with the localization problem of behind-wall stationary human for through-wall-radar. In the case of stepped-frequency continuous-wave and one transmitter and two receivers, the proposed algorithm is performed to achieve human location by life-sign detection and ellipse-cross-localization. First, based on clutter suppression, FFT and threshold detection, life-sign detection...
Heavy sea clutter seriously depresses the detection of distributed target. In this paper, an adaptive PM waveform design method with evaluation factor is proposed to suppress clutter energy and improve the detection performance. Simulations illustrate the effectiveness of this method.
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