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Owing to the special geometry and system deviations of missile-borne spotlight SAR with manoeuvring motion, the sequence designed with traditional methods used in airborne and space-borne SAR systems perform low precision. An unequal azimuth and pitch beamwidths will make the beam footprint turn into an irregular ellipse, which consequently renders it difficult to gain the accurate echo bandwidth...
A space-surface bistatic SAR-GMTI algorithm is proposed here and the clutter characters are also discussed. Then a reference signal is adopted for range compression, which can make the range cell migration and Doppler centroid decreased largely. Furthermore, the clutter Doppler and phase are analysed as well as the phase difference characteristics, a phase compensation function is constructed for...
It is a key step to study and design the missile-borne SAR (Synthetic Aperture Radar) by the computer simulation. In this paper, we present a simulation and assessment software of the missile-borne SAR imaging system, which calculates the flight path of the missile, generates the echo data of the target, outputs the imaging result and its quality assessment. After dividing functional modules, we exhibit...
A new optimal reconstruction method based on compressed sensing (CS) for sparse synthetic aperture radar (SAR)/ inverse SAR (ISAR), which can be used in widely sparse aperture, is proposed in this letter. Unlike other parametric estimation method as all-pole algorithm, CS can obtain near-optimal estimation and global-minimal error of gapped signal representation with structured dictionaries and random...
This paper investigates the restrictions of Synthetic Aperture Radar (SAR) ground fast moving target indication based on the conventional clutter suppression method in image domain which ignores the problems of range cell migration (RCM) and azimuth defocus. A technique for fast moving target indication and motion parameter estimation is proposed based on Doppler ambiguity resolving. In range frequency...
This paper focuses on the narrow band radar imaging for high-speed spinning targets. Based on the time-frequency characteristic of the echoed signal, a novel coherent spectrogram redistribution method, coherent single range Doppler interferometry (CSRDI), is proposed, which is of high resolution and robust even in the case of the low signal-to-noise ratio. The spinning rate error is also taken into...
Fully PolSAR data provided by the NASA/JPL laboratory are widely used to classify PolSAR image. In this paper, an unsupervised Cameron/ML approach is proposed to classify airborne fully polarimetric data collected by a research institute in China. Cameron's method is used to initially classify the PolSAR image firstly. Secondly the initial classification map defines training sets for the maximum likelihood...
This paper establishes the model of high squint FMCW SAR received signal, analyzes its characteristics, and posts the Doppler frequency shift effect induced by the continuous motion in range direction while radar transmitting and receiving signal. Meanwhile, this paper proposes a modified RD algorithm (RDA) aimed at high squint FMCW SAR dechirp-on-receive data, which compensates for range walk in...
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