Sensors 2013, 13(4), 5347-5367; https://doi.org/10.3390/s130405347
Cramer-Rao Bounds and Coherence Performance Analysis for Next Generation Radar with Pulse Trains
1
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
2
Department of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
3
Electronic Engineering Institute, Hefei 230037, China
*
Author to whom correspondence should be addressed.
Received: 1 March 2013 / Revised: 28 March 2013 / Accepted: 16 April 2013 / Published: 22 April 2013
(This article belongs to the Section Physical Sensors)
Abstract
We study the Cramer-Rao bounds of parameter estimation and coherence performance for the next generation radar (NGR). In order to enhance the performance of NGR, the signal model of NGR with master-slave architecture based on a single pulse is extended to the case of pulse trains, in which multiple pulses are emitted from all sensors and then integrated spatially and temporally in a unique master sensor. For the MIMO mode of NGR where orthogonal waveforms are emitted, we derive the closed-form Cramer-Rao bound (CRB) for the estimates of generalized coherence parameters (GCPs), including the time delay differences, total phase differences and Doppler frequencies with respect to different sensors. For the coherent mode of NGR where the coherent waveforms are emitted after pre-compensation using the estimates of GCPs, we develop a performance bound of signal-to-noise ratio (SNR) gain for NGR based on the aforementioned CRBs, taking all the estimation errors into consideration. It is shown that greatly improved estimation accuracy and coherence performance can be obtained with pulse trains employed in NGR. Numerical examples demonstrate the validity of the theoretical results. View Full-TextKeywords:
next generation radar (NGR); Cramer-Rao bound (CRB); Fisher information matrix (FIM); pulse trains; parameter estimation; coherence performance
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Tang, X.; Tang, J.; He, Q.; Wan, S.; Tang, B.; Sun, P.; Zhang, N. Cramer-Rao Bounds and Coherence Performance Analysis for Next Generation Radar with Pulse Trains. Sensors 2013, 13, 5347-5367.