Abstract
Retransmission deception jamming seriously degrades the Synthetic Aperture Radar (SAR) detection efficiency and can mislead SAR image interpretation by forming false targets. In order to suppress retransmission deception jamming, this paper proposes a novel multiple input and multiple output (MIMO) SAR structure range direction MIMO SAR, whose multiple channel antennas are vertical to the azimuth. First, based on the multiple channels of range direction MIMO SAR, the orthogonal frequency division multiplexing (OFDM) linear frequency modulation (LFM) signal was adopted as the transmission signal of each channel, which is defined as a sub-band signal. This sub-band signal corresponds to the transmission channel. Then, all of the sub-band signals are modulated with random initial phases and concurrently transmitted. The signal form is more complex and difficult to intercept. Next, the echoes of the sub-band signal are utilized to synthesize a wide band signal after preprocessing. The proposed method will increase the signal to interference ratio and peak amplitude ratio of the signal to resist retransmission deception jamming. Finally, well-focused SAR imagery is obtained using a conventional imaging method where the retransmission deception jamming strength is degraded and defocused. Simulations demonstrated the effectiveness of the proposed method.
Highlights
Synthetic aperture radar (SAR) has been widely used in civil exploration and military surveillance due to its all-weather, long-time and large-range detection capabilities [1]
The antenna is staggered in a direction that is vertical with the azimuth direction, which is called called the range direction
Range Direction multiple input and multiple output (MIMO) SAR Anti-Deception Jamming Efficiency Analysis efficiency of the range MIMO SAR is analyzed after signal pre-processing and imaging
Summary
Synthetic aperture radar (SAR) has been widely used in civil exploration and military surveillance due to its all-weather, long-time and large-range detection capabilities [1]. As for a classical non-parametric method, it is arduous to design an appropriate filter for the echo signal, which is blurred by NBI and interfered with by wide band jamming. 123 proposed methods, the jammer signal could not get the signal processing gain of and will defocus in the SAR image because of the mismatch with the target echo. Sub-bandthe signal synthesis will increase theMIMO target paper is organized follows: Section the 2 presents principle of range direction signal processing gain and the to interference ratioofwill. Section proposes the pre-processing method of the concurrently transmitted sub-band signals of retransmission deception jamming suppression.
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