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We consider an optimization problem of antenna placement of multistatic radar system (MSRS). The goal is to improve the system performance in terms of both detection capability and localization accuracy by optimally placing the antennas of MSRS. To this end, a coverage ratio and an average geometric dilution of precision (GDOP) of surveillance region are proposed as objective functions to evaluate...
In this paper, radar detection of Swerling target of type 3 in GO-distributed clutter via dynamic programming based track-before-detect (DP-TBD) is considered. Conventional DP-TBD suffers from significant performance loss due to the high frequency of target-like outliers. To enhance the detection performance of DP-TBD, the log-likelihood ratio (LLR) of the measurements is derived and used in the integration...
The conventional CFAR detectors based on reference window suffer a considerable performance degradation in heterogeneous background. In this paper, a new knowledge based constant false alarm rate (KB-CFAR) detector is proposed to reduce the impact of heterogeneous environment. The proposed KB-CFAR detector exploits clutter partition as auxiliary knowledge to select the reference cells. The clutter...
This paper considers the coherent integration problem for a maneuvering target with jerk motion, involving range migration (RM) and Doppler frequency migration (DFM) within the coherent integration period. A fast non-searching method based on adjacent cross correlation function (ACCF) is proposed to realize the coherent accumulation, where two adjacent cross correlation operations are employed to...
This paper considers the range migration correction problem for realizing the coherent integration of a maneuvering target's energy, involving range walk and range curvature within the coherent integration period. A range migration correction algorithm based on the generalized keystone transform (GKT) is proposed, where two GKT operations and fold factor phase term compensation are employed to remove...
This paper addresses the problem of speckle covariance matrix estimation for Compound-Gaussian clutter. The speckle component is modeled as a low order autoregressive (AR) process. We derive the AR coefficients conditioned Likelihood function of the secondary data and propose an iterative approach for the optimizing problem under the criteria of Maximum-Likelihood (ML). We evaluate the performance...
This paper addresses the target detecting problem of the shared-spectrum multistatic radar. All of the transmitters emit the same waveforms in the same spectrum in this radar system. By widely separating the platforms of the shared-spectrum radars and adopting the temporal diversity of transmitter-receiver pairs, the spatial diversity is exploited to improve the detection performance. The signal model...
This paper mainly deals with the problem of detecting a target in SIRV clutter with steering vector mismatches. Assuming that the mismatch of the steering vector is satisfied the conic constraint, the generalized likelihood ratio test (GLRT) is devised, and the geometry explain is presented for the derived solution. Meanwhile, fixed point estimate (FPE) of the covariance structure is adopted using...
This paper mainly deals with the target detecting problem using polarimetric Multiple Input and Multiple Output (MIMO) radar with unknown covariance matrix. And the GLRT-based receiver is devised by resorting to the two-step design procedure. Specifically, the GLRT is devised with known covariance, and then, a suitable estimate of covariance is obtained using secondary data to plug into the derived...
In this paper, we first introduce the definition of spherically invariant random vector (SIRV) and then give the representation of Weibull distribution by SIRV and two detection algorithms for Weibull clutter. In particular, the optimum detector is derived for the distributed target by the Neyman-Pearson (NP) criterion. Since the optimum NP detector is impossible to realize at the practical situations,...
This paper mainly deals with the target detecting problem using a MIMO radar against compound-Gaussian clutter with an unknown covariance matrix. The space-time coding MIMO radar model has adopted, and developed to compound-Gaussian case. The detector based on generalized likelihood ratio test (GLRT) criterion is studied, and two-step design procedure is adopted. Specifically, the GLRT is derived...
Dynamic Programming (DP) algorithm based Track Before Detect (TBD) is an efficient approach to detect the dim moving target. However, the big computational burden is the disadvantage of DP algorithm, which restricts its applications in many fields, such as radar detection where the real-time processing is a necessary requirement. A modified DP algorithm has been developed in this paper. The main idea...
Non-coherent detection using multiple pulses is very useful in radar detection, especially in the case that the phase information of return pulses is unavailable. This paper addresses the performance of non-coherent CFAR detection based on goodness-of-fit (GoF) tests compared with non-coherent CFAR integrator (NCCI) in different clutter environments by simulation experiments, when the assumed and...
Based on the diversity between the information entropy of target echo and disturbance introduced by high resolution radar, a new detection algorithm for range spread target via Renyi's entropy is proposed for the first time in this paper. The proposed entropy detector's performance assessment and its comparison with two previously traditional detectors show that the entropy detector can achieve satisfactory...
When a human walks, the motion of various components of the body including the head, torso, arms, legs, and feet produce a very characteristic Doppler signature. A new signal model of the walking human, based on the linear frequency modulated (LFM) signal, is proposed. This model contains 12 scatter-points of human, together with kinematic equations of motion of each body part. For each part of human...
Dynamic programming (DP) based track before detect (TBD) is an efficient algorithm to detect moving target with slow maneuvers when the SNR is low. After the integration process of DP algorithm, however, the track separation phenomenon is a prevalent problem for trajectory recovering. In this paper, a modified DP algorithm is used to process the data after the envelope detection of radar system. The...
Ellipse-cross-localization (ECL) method is presented for TWR location in this paper. The location error is mainly influenced by errors of the wall parameters and the target relative position to antennas. The effect of wall thickness and dielectric constant on TWR localization is analyzed. And the localization accuracy of detection region in different antennas configurations is illustrated by location...
A new practical approach to estimate wall parameters with the UWB through-the-wall radar for the moving target localization is presented. By moving two independent monostatic single-antenna radar units to the new standoff positions from the wall, the unknown parameters can be determined; then the exact positions of the moving target are obtained with known wall parameters. The algorithm corrects for...
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