Abstract
This work addresses the problem of target detection for multistatic radars. We propose an algorithm that is able to keep constant the false alarm rate, when the disturbance samples associated with each receiver-transmitter pair are distributed according to a compound Gaussian model. The performance of the proposed detection algorithm are analysed to assess the impact of clutter diversity on detection performance. The results show that clutter statistical diversity has a strong impact on detection performance. The performance of both single-channel and multichannel detection schemes are evaluated by processing real sea clutter data collected by the NetRAD nodes, in order to evaluate which of the two channels, i.e. the bistatic and monostatic channels, is more favourable for target detection. Furthermore, the gain achieved by using a multistatic detection algorithm is also analysed.
Highlights
Sea clutter is typically non-Gaussian and non-stationary, which makes the design of proper detection algorithms a critical task
Under the hypothesis of compound Gaussian clutter, this algorithm is able to keep constant the false alarm rate (FAR). This property is verified both when the clutter covariance matrix is a priori known and when it is unknown and estimated from the range cells surrounding the range cell under test (in this case, we use the adaptive version of the normalized matched filter (NMF), i.e. the normalized adaptive matched filter (NAMF) [4,5,6])
By examining Eq (9), it could be noted that the blocks on the main diagonal represent the autocovariance matrices of the clutter, texture and speckle samples collected by one transmitter-receiver pair, whereas the blocks off the diagonal represent the cross-covariances between the temporal samples collected by the mn-th and rs-th channels
Summary
Sea clutter is typically non-Gaussian and non-stationary, which makes the design of proper detection algorithms a critical task. The performance of the single-channel NAMF is evaluated on real sea clutter data, collected by the nodes of the multistatic radar system, NetRAD [24, 25], in order to evaluate the differences between the bistatic and monostatic sea clutter from a radar detection standpoint. The performance of the multichannel NAMF are analysed by processing real clutter data, with the aim of investigating whether and under which conditions a multistatic detector is able to provide a performance gain with respect to the single-channel detector.
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