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Observability and estimability of passive radar with unknown illuminator states using different observations 被引量:2
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作者 JING Tong TIAN Wei +1 位作者 HUANG Gaoming PENG Huafu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2020年第6期1193-1205,共13页
Most existing studies about passive radar systems are based on the already known illuminator of opportunity(IO)states.However,in practice,the receiver generally has little knowledge about the IO states.Little research... Most existing studies about passive radar systems are based on the already known illuminator of opportunity(IO)states.However,in practice,the receiver generally has little knowledge about the IO states.Little research has studied this problem.This paper analyzes the observability and estimability for passive radar systems with unknown IO states under three typical scenarios.Besides,the directions of high and low estimability with respect to various states are given.Moreover,two types of observations are taken into account.The effects of different observations on both observability and estimability are well analyzed.For the observability test,linear and nonlinear methods are considered,which proves that both tests are applicable to the system.Numerical simulations confirm the correctness of the theoretical analysis. 展开更多
关键词 passive radar passive coherent location(PCL) OBSERVABILITY ESTIMABILITY unknown illuminator states
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Accurate single-observer passive coherent location estimation based on TDOA and DOA 被引量:23
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作者 Li Jing Zhao Yongjun Li Donghai 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第4期913-923,共11页
This paper investigates the problem of target position estimation with a single-observer passive coherent location(PCL) system. An approach that combines angle with time difference of arrival(ATDOA) is used to est... This paper investigates the problem of target position estimation with a single-observer passive coherent location(PCL) system. An approach that combines angle with time difference of arrival(ATDOA) is used to estimate the location of a target. Compared with the TDOA-only method which needs two steps, the proposed method estimates the target position more directly. The constrained total least squares(CTLS) technique is applied in this approach. It achieves the Cramer–Rao lower bound(CRLB) when the parameter measurements are subject to small Gaussian-distributed errors. Performance analysis and the CRLB of this approach are also studied. Theory verifies that the ATDOA method gets a lower CRLB than the TDOA-only method with the same TDOA measuring error. It can also be seen that the position of the target affects estimating precision.At the same time, the locations of transmitters affect the precision and its gradient direction.Compared with the TDOA, the ATDOA method can obtain more precise target position estimation.Furthermore, the proposed method accomplishes target position estimation with a single transmitter,while the TDOA-only method needs at least four transmitters to get the target position. Furthermore,the transmitters' position errors also affect precision of estimation regularly. 展开更多
关键词 Constrained total leastsquares Cramer-Rao bounds Direction of arrival passive coherent location Time difference of arrival
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Moving target detection in the cepstrum domain for passive coherent location(PCL) radar
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作者 Ji-chuan LI Xiao-de LU +3 位作者 Hui ZHANG Peng-cheng YANG Yu LIU Mao-sheng XIANG 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2015年第9期785-795,共11页
A cepstrum moving target detection (CEPMTD) algorithm based on cepstrum techniques is proposed for passive coherent location (PCL) radar systems. The primary cepstrum techniques are of great success in recognizing... A cepstrum moving target detection (CEPMTD) algorithm based on cepstrum techniques is proposed for passive coherent location (PCL) radar systems. The primary cepstrum techniques are of great success in recognizing the arrival times of static target echoes. To estimate the Doppler frequencies of moving targets, we divide the radar data into a large number of seg- ments, and reformat these segments into a detection matrix. Applying the cepstrum and the Fourier transform to the fast and slow time dimensions respectively, we can obtain the range information and Doppler information of the moving targets. Based on the CEPMTD outlined above, an improved CEPMTD algorithm is proposed to improve the detection performance. Theoretical analyses show that only the target's peak can be coherently added. The performance of the improved CEPMTD is initially vali- dated by simulations, and then by experiments. The simulation results show that the detection performance of the improved CEPMTD algorithm is 13.3 dB better than that of the CEPMTD algorithm and 6.4 dB better than that of the classical detection algorithm based on the radar cross ambiguity function (CAF). The experiment results show that the detection performance of the improved CEPMTD algorithm is 1.63 dB better than that of the radar CAF. 展开更多
关键词 Moving target detection Cepstrum techniques Cross ambiguity fimction (CAF) passive coherent location (PCL)radar
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