Geosynchronous synthetic aperture radar (GEO SAR) data focusing is a more challenging and difficult task than the low earth orbit (LEO) SAR due to strong 2-D coupling of echo signal induced by orbital trajectory curvature. The range cell migration (RCM) in GEO configuration space variant both azimuth directions, hence standard RCM correction (RCMC) functions developed for LEO are inadequate GEO. In this letter, curved model proposed, taking into consideration impacts "stop-and-go"...

Sea clutter has a major impact on the detection performance of shipborne high-frequency surface wave radar (HFSWR) system. Due to platform motion HFSWR, Doppler spectrum first-order sea suffers from some broadening so that targets submerged in this can be hardly detected. In letter, an improved oblique projection (IOP) method, combining (OP) algorithm and method suppression domain, is proposed suppress both domain spatial for HFSWR. Compared with OP orthogonal weighting algorithms, IOP shown...

For a synthetic aperture radar (SAR) system mounted on geostationary Earth orbit (GEO) satellite, the track can be curvilinear. Thus, bistatic SAR based up transmitter and "receive-only" onboard airplanes, namely GEO spaceborne-airborne (GEO SA-Bi SAR), is significantly different from traditional SAR. This paper mainly studies resolution characteristic of sliding spotlight system. Firstly, common azimuth coverage coherent accumulated time are theoretically analyzed in detail. Then, gradient...

Shipborne bistatic inverse synthetic aperture radar (ISAR), with a stationary and visible transmitter on land mobile stealthy receiver ship complex 3-D rotations is strategic asset which can provide complementary information to monostatic ISAR. However, it must first overcome the serious problems of defocusing distortion due time-varying angle. In this letter, an improved cubic chirplet decomposition method proposed solve problem. By decomposing ISAR echo into atoms estimating parameters for...

In geosynchronous Earth orbit SAR (GEO SAR), Doppler centroid compensation is a key step for imaging process, which could be performed by the attitude steering of satellite platform. However, this zero-Doppler control method does not work well when look angle radar out an expected range. This paper primarily analyzes properties GEO in rectangular coordinate. Then, according to actual conditions ground observation, effective range presented minimum and maximum possible angles are directly...

In geosynchronous (GEO) synthetic aperture radar (SAR), the satellite track is curvilinear and typical assumption of ‘stop‐and‐go’ breaks down due to increase orbit altitude. Thus, standard imaging algorithms based on conventional hyperbolic range equation (CHRE) become inadequate. A four‐order taking errors into consideration adopted improve accuracy in approximation history for GEO SAR. Then, an accurate two‐dimensional spectrum analytically deduced under curved trajectory model, a...

A 3-D inverse synthetic aperture radar (ISAR) image can provide target's information in the range, azimuth, and height dimensions. Since resolution is related to variant observing angles, existing ISAR imaging methods are highly dependent on radar's hardware complexity (two or more sensors). In this paper, we propose a novel shipborne method, which utilizes maneuvering movement of one single obtain resolution, hence, restriction relaxed. Moreover, cubic chirplet decomposition algorithm based...

Pose normalization is beneficial for improving the accuracy of Synthetic Aperture Radar (SAR) Automatic Target Recognition (ATR). In fact, pose can be achieved by rotating given images according to estimated target interest. However, partial defect targets in SAR caused shadow effect affects estimation. This paper proposes a estimation method based on exploration geometrical information interest images. The proposed evaluated with moving and stationary acquisition recognition (MSTAR) public...

Geosynchronous (GEO) SAR is a radar satellite running in the inclinational geosynchronous orbit (36000km). During long signal propagation delay time, relative motion between and target cannot be ignored. In this paper, two-way slant range analytically obtained from vector derivation. Meanwhile, it found that image formation must consider non-uniform velocity synthetic aperture therefore, based on derived instantaneous of satellite, modified back projection algorithm put forward to overcome...

Sea clutter has a serious influence on the detection performance of shipborne high-frequency surface wave radar (HFSWR) system, especially when target is submerged in spread Doppler spectrum first-order sea clutter. A prediction cancellation (PC) method based radial basis function neural network (RBFNN) put forward to suppress time domain for HFSWR. Using RBFNN trained by averaged data from range cells surrounding cell interest, PC algorithm implemented interested cell. Compared with...

In geosynchronous (GEO) synthetic aperture radar (SAR), the time increases to hundreds of seconds and signal propagation delay reaches up milliseconds, resulting in violation stop-and-go assumption linear trajectory model. The accurate slant range history is created based on consideration error. Then, an extended keystone transform proposed correct more complicated cell migration, a two-dimensional nonuniform Fourier presented achieve well-focused image. simulation results verify correctness...

Geosynchronous SAR (GEO SAR) has significant potential advantages in the fields of continuous earth observation within 24 hours. Due to increase orbit height, synthetic aperture trajectory tends be curved, and thus, conventional integration time calculation resolution analysis methods low (LEO will lose effect GEO cases. In this paper, maximum is analytically obtained from vector derivation. Then spatial for derived detail based on gradient method. Simulation results validate correctness proposed