In synthetic aperture radar (SAR) imaging of a ground moving target, long-time coherent integration may effectively improve the quality, whereas performance severely degrade due to range migration and Doppler frequency migration. this paper, novel motion parameter estimation method named second-order Wigner-Ville distribution (SoWVD) transform is proposed, then, new SAR based on SoWVD for target developed. As modified method, can estimate without search procedure, which achieves by Fourier...

Real-time radial velocity estimation is a key challenge for moving target imaging and location in current single-antenna synthetic aperture radar (SAR)-ground indication systems. Since the conventional methods suffer from ambiguity, complexity realization, or heavy computation load fast motion estimation, this paper emphasizes efficiency by simple realization. An efficient Radon transform (RT) proposed to estimate of utilizing geometry information, much more information exploited realize...

This paper addresses the problem of detecting a signal in partially homogeneous and environments. In environments, i.e., both test data training share same noise covariance matrix structure up to an unknown scaling factor, persymmetric adaptive coherence estimator (Per-ACE) detector is proposed. By exploiting matrix, Per-ACE can reduce requirements. Furthermore, expressions for probabilities false alarm detection are derived along with distribution loss factor β. matched filter (Per-AMF) has...

In synthetic aperture radar (SAR), long integration time may induce range migration and Doppler frequency of a received signal, which degrade the SAR imaging performance ground moving targets. Most conventional algorithms deal with problems based on parameter searching. However, exhaustive searching target motion parameters result in heavy computational burden. To avoid this problem, paper proposes new method for targets without estimation. First, Keystone transform is applied to correct...

Efficient motion parameter estimation is a key challenge for moving-target imaging and localization in the synthetic aperture radar ground indication system. However, existing methods suffer from ambiguities, complex realization, or heavy computation load of O(MN). To solve these problems, we propose an efficient Radon transform (RT) fractional Fourier (FRFT) to estimate radial velocity azimuth velocity. By exploiting geometry information, model relationship between parameters two angles RT...

The detection and parameters estimation of linear frequency-modulated (LFM) signal are important for modern radar applications, but they also challenged by the fact that echo is often low signal-to-noise ratio (SNR) due to reasons long imaging distance and/or limited transmitted power, target small size hidden characteristics. To enhance SNR, in our previous work, a novel coherently integrated cubic phase function (CICPF) was recently developed multicomponent LFM signal. In CICPF, auto-terms...

Compressed sensing (CS) has been increasingly used in the synthetic aperture radar ground moving-target indication system, particularly for imaging moving targets, which satisfy sparse precondition of CS method. However, efficient is a key challenge current methods, since redundant basis brings heavy computation load. In this letter, by exploiting geometry information defocused results, we present an fractional Fourier transform (FRFT) to estimate Doppler rate and image targets only two...

Video-SAR combines SAR imaging and video techniques together, enabling continuous surveillance of a specific area, which is new developing microwave detection technology. Several airborne achievements have been published; however, less attention has paid to the moving targets in as well spaceborne platforms. In this paper, observation problem solved by multi-relay-receivers mode geostationary transmitter can cover large scene uninterruptedly. A sketchy describe system performance parameters...

In this letter, a novel method is proposed to estimate the along-track baseline for multichannel synthetic aperture radar (SAR) system, intended ground moving target indication (GMTI) applications. First, an adaptive spectrum filtering technique compensate terrain interferometric phase caused by cross-track and then clutter rejected applying joint-pixel displaced center antenna (JPDPCA). After performing detection, radial velocity estimated according azimuth position offset exploiting...

The radio frequency interference (RFI) and deceptive jamming (DJ), as two major external threats to synthetic aperture radar (SAR) systems, can greatly reduce the readability veracity of obtained SAR images. Current suppression methods have no capability suppress both them. In this article, a subpulse coding (SPC)-based joint RFI DJ method for single-channel systems is proposed. By making full use elaborate scheme transmitting mode, SPC effectively RFIs in Doppler domain. On other hand,...

We propose an total variation (TV) regularization approach for the reconstruction of super-resolution synthetic aperture radar (SAR) image based on gradient profile prior. Then we design a algorithm via split Bregman iteration with known degradation matrix. The evaluation index is tested SAR images objective assessment performance reconstruction. Experimental results show that proposed Bregamn has good effect noise suppression, while able to effectively maintain content. Besides,...

The problem of suppressing mainlobe deceptive jammers, which spoof radar systems by generating multiple false targets, has attracted widespread attention. To tackle this problem, in paper, the multiple-input multiple-output (MIMO) system was utilized applying a quadratic element phase code (QEPC) to transmitted pulses different elements. In receiver, utilizing spatial frequency and Doppler offset generated after decoding, jammers were equivalently distributed sidelobes joint...

The traditional phased array radar is unable to distinguish mainlobe deceptive interference from the true target when they share an identical angle. To address this issue, a method developed suppress in joint transmit–receive–Doppler frequency domain, using secondary compensation and quadratic phase code (QPC) with diversity multiple-input multiple-output (FDA-MIMO) radar. QPC technique employed by encoding transmitted pulses various spatial channels, which extends degrees-of-freedom (DOFs)...

Suffering from ambiguous estimation or heavy computation complexity load, the radial velocity of moving targets becomes bottleneck synthetic aperture radar-ground target indication system. In order to improve efficiency, we have proposed an efficient Radon transform (RT) (ERTE) method by using never exploited geometry information, which performs well in high SNR scenarios but bad for low SNR. Focusing on these, propose least square RT (LSRTE) accuracy utilizing information multiple results....

For SAR-GMTI system, efficient motion parameters estimation is a key challenge for moving targets imaging and localization, especially in low SNR scenarios. By four dimension (4-D) searching, the Radon FRFT can achieve even when low. But 4-D searching operation brings heavy computation load. Focusing on these, we propose an method to estimation. utilizing unexploited geometry information, reduce original into only 2-D promoting efficiency great extent. Compared with conventional method,...

Moving targets localization is an important challenge in current synthetic aperture radar (SAR) — ground moving target indication (GMTI) system. The along track interferometry (ATI) method usually used for GMTI SAR, however, which suffers from ambiguous parameters estimation due to wrapped phase and less robust errors (of system motion of the targets). Focusing on these, we propose a new neural network based improve performance. After analyzing main error source conventional ATI method,...

Skilled at representing the chirp signal, Radon-Wigner distribution (RWD) plays an important role in parameters estimation for moving targets. By searching best time-frequency angle, conventional RWD method suffers from tradeoff between accuracy and computation complexity. In this paper, efficient is proposed by exploiting geometry information domain, extensive replaced only two computation, then complexity effectively reduced O(MN) to O(2N). The applied targets velocity estimation, which...

As the electromagnetic environment increases complexity, signals in same frequency band will interfere with synthetic aperture radar (SAR), causing distortion SAR images. Most notch filters set a fixed threshold and zero to achieve radio interference (RFI) suppression which is not adaptive when energy level of RFI varies. In this letter, an iterative filtering method based on range-frequency domain outlier detection proposed. It uses hybrid indicators distinguish differences range spectrum...

A multi-channel forward-looking missile-borne radar diving model is proposed in this paper with a formulation characterizing the relationship of clutter angle-Doppler response. The difference between horizontal and platform that an additional Doppler frequency induced by velocity. We show leads to spectrum serious varying across range which increases non-homogeneity training data degrades performance space-time adaptive processing (STAP). numerically characterize spatial-temporal array...