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It is shown that if the pulse-repetition frequency of a coherent pulse-Doppler radar is at least twice the Doppler bandwidth, one may, using appropriate downconversion, sample the radar signal at half the Nyquist rate with no loss in range resolution and no folding of Doppler frequencies. This results in a 3-dB loss of signal-to-noise ratio 相似文献
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An approach is presented to data association (DA) problems for which measurements are independent from scan to scan. It is demonstrated that maximum likelihood (ML) estimation of target parameters may be efficiently implemented by an EM iterative scheme. The algorithm is applied to multitarget trajectory estimation of constant-velocity targets from passive (bearing-only) sensors 相似文献
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The estimation of the delay between two signals is examined in the limit of high signal-to-noise ratio (SNR). It is shown that for the case of white noise, cross correlation with no prefiltering approaches the optimal maximum-likelihood (ML) estimator as the SNR grows to infinity. In simulation experiments with SNRs greater than 1, it outperforms the approximate ML estimator, which is based on estimated spectra. Other algorithms, such as generalized cross correlation or parameter estimation algorithms, are shown to be suboptimal at high SNRs 相似文献
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