Adaptive Single-Channel Direct Signal Suppression for Ambient Noise Passive Radar Sounding

AbstractPassive radar (PR) systems need to detect the presence of a target response, which is many orders of magnitude weaker than the clutter (direct signal and multipath). Indeed, the clutter cancellation is a key stage within a PR processing scheme. One of the most effective techniques in this field is using the CLEAN approach. In this paper, the batch-based CLEAN technique based on GMP and FFT has been proposed, which can speed up the computational processing and have better cancellation gain. Furthermore, segmenting operation can be applied to the signal obtained over long time. It is helpful to enhance temporal or spatial efficiency and overcome effect of time-varying clutter. Experiment results with simulated and real passive radar data verify the effectiveness of the proposed algorithm.

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Antenna Array for Passive Radar: Configuration Design and Adaptive Approaches to Disturbance Cancellation

International Journal of Antennas and Propagation ◽

10.1155/2013/920639 ◽

2013 ◽

Vol 2013 ◽

pp. 1-16 ◽

Cited By ~ 9

Author(s):

Michelangelo Villano ◽

Fabiola Colone ◽

Pierfrancesco Lombardo

Keyword(s):

Antenna Array ◽

Passive Radar ◽

Comparative Performance ◽

Direct Signal ◽

Practical Applications ◽

Radar Sensors ◽

Array Configuration ◽

Disturbance Cancellation ◽

Adaptive Cancellation ◽

Stationary Obstacles

We consider the selection of an antenna array configuration, composed of a small number of omnidirectional elements, to be exploited for passive radar sensors. Based on properly identified pattern characteristics and design criteria for practical applications, a suitable planar configuration is selected that allows both angular selectivity and direct signal attenuation. The selected configuration is further optimized in terms of sidelobe level by resorting to appropriate amplitude tapering. Moreover, three different approaches are investigated for antenna-based adaptive disturbance cancellation, and a comparative performance analysis is carried out. Simulation results show that an effective clutter suppression is obtained if the direct signal from the transmitter is attenuated by means of spatial adaptive cancellation, and the multipath echoes from stationary obstacles are removed by means of temporal adaptive cancellation. In particular, the approach based on the Sidelobe Canceller is shown to yield good performance while requiring a limited system complexity.

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First results of air target detection using single channel passive radar utilizing GPS illumination

2019 IEEE Radar Conference (RadarConf) ◽

10.1109/radar.2019.8835655 ◽

2019 ◽

Author(s):

Konrad Gronowski ◽

Piotr Samczynski ◽

Krzysztof Stasiak ◽

Krzysztof Kulpa

Keyword(s):

Target Detection ◽

Single Channel ◽

Passive Radar ◽

First Results

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A Concept of a Passive Radar with Quadrature Microwave Phase Discriminators

Metrology and Measurement Systems ◽

10.2478/v10178-012-0008-9 ◽

2012 ◽

Vol 19 (1) ◽

pp. 95-104

Author(s):

Adam Rutkowski

Keyword(s):

Signal Detection ◽

Reference Signal ◽

Digital Signal ◽

Ambiguity Function ◽

Function Evaluation ◽

Passive Radar ◽

Direct Signal ◽

Signal Processors ◽

Signals Of Opportunity ◽

Cross Ambiguity Function

A Concept of a Passive Radar with Quadrature Microwave Phase Discriminators Passive radar does not have its own emitter. It uses so-called signals of opportunity emitted by non-cooperative illuminators. During the detection of reflected signals, a direct signal from a non-cooperative emitter is used as the reference signal. Detection of electromagnetic echoes is, in present day radars, performed by finding the maximum of the cross ambiguity function. This function is based on the multiplication of the received signal and the reference signal. Detection of echoes by means of a quadrature microwave phase discriminator QMPD was proposed in the work as an alternative solution for ambiguity function evaluation. This discriminator carries out vectorial summing of the received and the reference signals. The summing operations in QMPD are carried out with the aid of microwave elements and without the use of expensive digital signal processors. Definitions of the phase and phase difference of the so-called simple signals and noise signals were described. A proposal of a passive radar equipped with several independent quadrature microwave phase discriminators was presented. Ideas of algorithms of object detection and of the distance-to-object estimation designed for this radar have been also sketched.

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