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Moving target indication

About: Moving target indication is a research topic. Over the lifetime, 2653 publications have been published within this topic receiving 32435 citations.


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Journal ArticleDOI
Baochang Liu1, Tong Wang1, Yongkang Li1, Fengyang Shen1, Zheng Bao1 
TL;DR: Experimental results from SAR-GMTI data validate the effectiveness of the newly proposed baseline estimation method, which is designed to account for the variation of interferometric phase variance over different Doppler bins.
Abstract: For multichannel synthetic aperture radar based ground moving-target indication (SAR-GMTI), the effective baseline usually needs to be estimated in order to obtain an accurate estimate of radial velocity for each moving target. This paper deals with the effects of Doppler aliasing on baseline estimation. We show that Doppler aliasing can introduce an interferometric phase uncertainty as well as an interferometric phase bias. The phase uncertainty will increase the variance of the baseline estimate, whereas the phase bias will bias the baseline estimate. To address the aforementioned effects caused by Doppler aliasing, a new method for estimating the effective baseline is proposed. One of the key steps of this method is to perform an operation called sample censoring aimed at mitigating the problem of estimation bias. The censoring threshold can be approximately determined by introducing a concept referred to as equivalent variance for the interferometric phases of the entire Doppler bins. Moreover, in order to account for the variation of interferometric phase variance over different Doppler bins, a strategy of weighting is adopted. Experimental results from SAR-GMTI data validate the effectiveness of the newly proposed baseline estimation method.

20 citations

Patent
05 Feb 1979
TL;DR: In this paper, a time change or moving target indication system utilizing charge-coupled devices (CCD's) for signal processing in which successive integrated samples from individual detectors are loaded into adjacent CCD storage buckets and then clocked to an output device.
Abstract: A time change or moving target indication system utilizing charge-coupled devices (CCD's) for signal processing in which successive integrated samples from individual detectors are loaded into adjacent CCD storage buckets and then clocked to an output device. The output device is any suitable differencing arrangement which samples the charge stored in adjacent buckets and gives an output proportional to the difference. The system of the invention allows the successive signals from individual detectors to pass through virtually identical elements in the signal processing chain so as to reduce the effects of transfer inefficiency on the accuracy of the MTI subtraction process. Further, the signal spectrum from an individual detector output may be shifted to higher frequencies during the readout process so as to reduce the effects of any 1/f noise that may be present in the output device. The concept, in accordance with the invention, may be implemented off the focal plane as well as on the focal plane and may be implemented for a single row of detectors or for a detector array. In the off-focal plane configuration in accordance with the invention, the detectors are sampled at a rate much higher than the system field time to provide a high signal bandwidth which permits additional signal processing such as noise spike suppression and background subtraction to be performed before subsequently integrating the samples from individual detectors over the desired field time.

20 citations

Journal ArticleDOI
TL;DR: A novel method for traffic monitoring using a spaceborne dual-platform synthetic aperture radar system and the true geographical positions, the velocities, and the moving directions of the detected moving targets can be estimated with high accuracy.
Abstract: In this paper, a novel method for traffic monitoring using a spaceborne dual-platform synthetic aperture radar system is presented. The chosen along-track baseline between both platforms needs to be on the order of ten to several tens of kilometers, resulting in a time lag of several seconds between the target observations. With the proposed method, the true geographical positions, the velocities, and the moving directions of the detected moving targets can be estimated with high accuracy. The method has been verified and evaluated using experimental data acquired with the German TerraSAR-X/TanDEM-X radar satellite formation. The results are compared with ground truth reference data.

20 citations

Proceedings ArticleDOI
07 Aug 2002
TL;DR: Numerical results show that the results from the nonlinear OOSM algorithm are in close agreement with those obtained from the EKF using time-ordered GMTI measurements.
Abstract: Measurements can arrive out-of-sequence at a central tracker due to varying data pre-processing times and communication delays in a multi-sensor target tracking system. A number of single-lag and multiple-lag out-of-sequence measurement (OOSM) filtering algorithms for the linear filtering problem are known in the research literature. In this paper, we present a multiple-lag nonlinear OOSM filtering algorithm based on an extension of the existing multiple-lag linear OOSM filtering algorithm Ground target tracking using multiple airborne ground moving target indicator (GMTI) radar sensors is an important problem in surveillance and precision tracking of ground moving targets. Sensor geometry with two nearly orthogonal GMTI sensors can significantly improve the position measurement accuracy with fast revisit times due to the narrow elliptical nature of the range and cross-range measurement error covariance matrix of a single sensor. We present numerical results for the multiple-lag nonlinear OOSM filtering algorithm using simulated GMTI measurements with nearly constant velocity motion in two dimensions. Our numerical results show that the results from the nonlinear OOSM algorithm are in close agreement with those obtained from the EKF using time-ordered GMTI measurements.

20 citations

Journal ArticleDOI
TL;DR: This paper deals with the problem of coherent radar detection of fast-moving targets in a high-range resolution mode by focusing on the spiky clutter modeled as a compound Gaussian process with rapidly varying power along range.
Abstract: This paper deals with the problem of coherent radar detection of fast-moving targets in a high-range resolution mode. In particular, we are focusing on the spiky clutter modeled as a compound Gaussian process with rapidly varying power along range. Additionally, a fast-moving target of interest has a few range cells migration within the coherent processing interval. Two coherent CFAR detectors are proposed taking into account target migration and highly inhomogeneous clutter. Both detectors involve solution of a transcendental equation, carried out numerically in a few iterations. The performance evaluation is addressed by numerical simulations and it shows a significant improvement in detection of fast-moving targets in inhomogeneous heavy tailed radar clutter.

20 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202327
202272
202131
202052
201966
201859