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By exploiting the sparsity of the imaging scene, compressed sensing (CS) imaging may provide an effective solution to cope with the tradeoff of high azimuth resolution and wide swath in synthetic aperture sonar imaging. However, existing CS imaging methods are based on narrowband signal model and the scaling effect on the echoes is normally omitted, which may seriously affect the ultimate image reconstruction...
Clutter suppression is a key problem for multi-channel SAR ground moving target indication (GMTI), which is sensitive to the correlation among channels. For real multichannel SAR-GMTI system, there are inevitably slight differences in the frequency response and antenna patterns among channels. Therefore, the correlation of channels will be worsen and channel balancing is a crucial step to obtain a...
In order to solve the contradiction of high azimuth resolution and wide swath in sonar and radar imaging, narrowband compressed sensing (CS) imaging has been studied in depth. This paper studies the wideband sonar imaging method via CS. Wideband CS imaging model is constructed. Scaling and Doppler frequency shift are considered in the model. The effect of wideband signal to traditional narrowband...
Sonar image automatic target recognition (ATR) is urgently needed in large-scale marine investigation. A modelbased Sonar image ATR method based on SIFT features is proposed in this paper. The proposed method can realize ATR for arbitrary shaped target by physically model 3D under water scene, generate simulated template images, extract Scale-invariant feature transform (SIFT) keypoints and matching...
In this paper, the cross-correlation noise is studies among orthogonal coding signals for multiple-input multiple-output synthetic aperture radar (MIMO-SAR). Based on the point spread functions (PSF) of matched and mismatched filtering among multiple orthogonal coding signals, it is shown that the cross-correlation noise cannot be ignored among different transmitting waveforms in MIMO-SAR and should...
For along-track multi-channel squint-looking synthetic aperture radar (SAR), this paper provides a signal model of ground moving target in 2-D frequency domain and complex image domain. Considered the hyperbolic range equation, an analytical frequency spectrum in 2-D frequency domain can be derived via the stationary phase principle (SPP). Interestingly, based on the model given in this paper, the...
The ‘stop-and-go’ approximation in the traditional ISAR processing cannot be satisfied in the LFMCW bistatic ISAR system, especially to the space target with high speed. The high speed can produce a high order polynomial phase in the frequency sweep cycle time, which will defocus the high range resolution profiles (HRRPs). In this paper, the LFMCW bistatic ISAR signal model of the space target is...
In this paper, a novel synthetic aperture imaging method based on compressed sensing (CS) is presented. The method, employing a novel sampling matrix, provides a new sampling scheme to prevent from azimuth ambiguity in wider imaging swath observation. With fewer azimuth observations, the method provides acceptable imaging results and solves the ambiguity problem successfully. The novel method requires...
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