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Staggered SAR is an innovative 2-D imaging system utilizing the digital beam-forming (DBF) technique and the continuous variation of pulse repetition frequency (PRF). However, due to the PRF variation, the echo data in the azimuth is non-uniformly sampled. To achieve good imaging quality, it is indispensable to interpolate the data of the staggered SAR to be uniform before further imaging processing...
In towed radar active decoy (TRAD) scenario, the target and decoy, locating in same radar half-power beam, make object tracking more challenging in today's electronic warfare. Since the DOAs (direction-of-arrival) of target and decoy are the parameters of the likelihood of the observation data, the categorization of their becomes a sampling problem of machine learning field. Therefore, we, in this...
Focusing bistatic SAR data in frequency domain requires the two dimensional (2D) point target reference spectrum (PTRS). In this paper, a 2D PTRS is derived based on Loffeld's bistatic formula (LBF). The spectrum in this paper combines the influence of the Doppler centroids and frequency modulated rates of the transmitter and receiver on the total Doppler contributions. The essential of this paper...
Synthetic Aperture Radar (SAR) has been applied in civilian and military fields widely. However, because of the inherent characteristic of monostatic SAR, it can not image the forward-looking terrain of the aerocraft [1]. As an emerging SAR technology, bistatic SAR is receiving considerable attention at present. With the choice of proper geometry, it can image in flight direction. We call this case...
In this paper, to overcome the limitation of the real-time state tracking of PLE, an algorithm is presented that recursively computers the maximum likehood (ML) estimates of a flying object position and velocity. By combining a priori ML estimate of the flying object state vector and its error covariance matrix with bearing measurements, updated estimates are obtained, localization and tracking for...
To better understand the fundamental of the spaceborne/airborne hybrid bistatic SAR (SA-BSAR) image formation, the range cell migration (RCM) of the SA-BSAR is studied in the range-Doppler domain, where the RCM in SA-BSAR can be explicitly expressed in close form. Through the analysis of RCM relationship with target's azimuth and range position, we can find that, because of the system platforms' velocity...
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