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We derive Cramér-Rao bounds (CRB) expressions for the velocity (Doppler shift), and direction of a point target using a bistatic multiple-input multiple-output (MIMO) radar in this paper. First, we introduce the signal and noise models which satisfy the space-time separability conditions. Then, general CRB expressions are derived for a narrowband signals with the above signal and noise models. We...
An image is often corrupted by noise in its acquisition or transmission. The goal of denoising is to remove the noise while retaining as much as possible the important signal features. In this paper, we propose a doubly local Wiener filtering method using adaptive directional windows and Mean Shift algorithm, in which the Mean Shift algorithm is first used to naturally segment the image into regions...
Due to good balance among spectrum efficiency, ambiguity function and peak-to-mean envelope power ratio (PMEPR), wideband Multi-Carrier Phase-Coded (MCPC) radar has caught much attention from researchers recently. Based on separation of sub carriers from multi-frequency structure, this paper provides velocity estimation method for such radar signal. After detecting the peek Doppler spectrum of each...
This paper presents a novel scheme for velocity estimation in wideband Multi-Carrier Phase-Coded (MCPC) radar, which has drawn considerable attention recently as a new generation of radar. Conventional narrowband Doppler processing preserves the phase relationship of the received pulses, thus not only increases the Signal-to-Noise Ratio (SNR), but also obtains reliable extraction of the Doppler parameters...
The aim of this work is the performance evaluation for a method used to analyze of a mono-component linear frequency modulation (LFM) signal, based on the quadratic phase function of the signal. A closed form is found for the output signal to noise ratio. The parameter selection problems of the algorithm are also discussed. Thresholds of the input SNR are presented to guarantee a reasonably accurate...
Many localization algorithms have been proposed for wireless sensor networks, in which the hop-count based localization schemes are attractive due to the advantage of low cost. However, these approaches usually utilize discrete integers to calculate the hop-counts between nodes. Such coarse-grained hop-counts make no distinction among one-hop nodes. More seriously, as the hop-counts between nodes...
The error model is nonlinear when the azimuth angle of strapdown inertial navigation system (SINS) on stable base is large, and a new filter results from using unscented Kalman filter for proposal distribution generation imbedding latest observed measurements in importance sampling step, and combining Gaussian mixture model and weighted expectation maximization (EM) algorithm to replace the traditional...
Signal parameter estimation is a crucial issue in SAR/ISAR imaging, especially for multicomponent linear frequency modulated (LFM) signal with single degree of freedom. A new method of parameter estimation based on sparse signal representation is presented in this paper, which expands signal on a set of over-complete basis. The method is analyzed and validated for performance through simulation, with...
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