Abstract
Traditional deceptive jamming methods effectively generate false targets against three-channel synthetic aperture radar ground moving target indication (SAR GMTI). However, effectiveness of traditional methods is limited to azimuth distance between two jammers. When the distance requirement is not satisfied, the jamming amplitude coefficients will be too high to be used by jammers. To overcome this disadvantage, a novel multiple-jammer deceptive jamming method is proposed. The intercepted radar signal is retransmitted and performed by amplitude and time-delay modulation. Then, jamming signal is first modeled as a polynomial function where the polynomial order is equal to the number of jammers. The interferometric phase difference between a moving target and a false target is utilized as an objective function, the azimuth relocated position difference between a moving target and a false target is utilized as the constraint to reduce computational burden, and the optimal jamming amplitude coefficients are estimated by solving the optimization problem based on the particle swarm optimization (PSO). Hereby, the optimal jamming amplitude coefficients and gain calculated with the proposed method will be lower than those calculated with traditional methods when the distance requirement is not satisfied. By utilizing the optimal coefficients and jamming amplitude gain, a false target generated with the proposed method will be detected by displaced phase center antenna (DPCA) technique and be relocated in the desired position by along-track interferometry (ATI) technique. Experimental results verify the effectiveness of the proposed method.
Highlights
Synthetic aperture radar ground moving target indication (SAR GMTI) has been widely utilized in both civil and military applications ranged from a city traffic monitoring to an airport surface surveillance and a battleground surveillance [1,2,3,4,5]
To prevent moving targets from being detected and relocated by displaced phase center antenna (DPCA) technique and along-track interferometry (ATI) technique, research on jamming methods against synthetic aperture radar (SAR) GMTI has been an important subject in electronic countermeasure (ECM)
A multiple-jammer deceptive jamming method based on particle swarm optimization (PSO) is proposed against three-channel SAR GMTI
Summary
Synthetic aperture radar ground moving target indication (SAR GMTI) has been widely utilized in both civil and military applications ranged from a city traffic monitoring to an airport surface surveillance and a battleground surveillance [1,2,3,4,5]. An important problem faced by jammers are that the limitation of the azimuth distance between jammers should be removed, which will lead to reduce the jamming amplitude coefficients To overcome this disadvantage, a multiple-jammer deceptive jamming method based on particle swarm optimization (PSO) is proposed against three-channel SAR GMTI. The nth jammer is denoted by the point J n and its coordinate is ( xn , yn , hn ), where n is an integer and it serves as the index for each jammer They modulate the intercepted signal to generate a verisimilar false moving target F, which is similar to the moving target M in the detection result with DPCA technique and ATI technique
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