相控阵雷达恒虚警性能研究
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摘要
本论文首先对我国某型号雷达中的MGO-CFAR检测器进行分析论证，重点分析了MGO-CFAR检测器在均匀背景杂波、多目标环境和杂波边缘环境中的性能。通过数学推导，得出了MGO-CFAR检测器在各种环境中的检测概率、虚警概率表达式，并用MATLAB编程，绘出了检测器的各种性能曲线。分析认为，MGO-CFAR检测器在均匀背景杂波中有着良好的检测能力，其检测能力只比CA-CFAR检测器有很小的损失。在杂波边缘环境中控制虚警能力优秀，远好于CA-CFAR检测器。但在多目标环境中的检测性能较差，当参考滑窗中有一个干扰目标时，MGO-CFAR的检测能力就已经严重下降。基于原来检测器的缺点，结合有序统计量概念，论文提出了MOSOS-CFAR检测器。MOSOS-CFAR检测器在前后滑窗分别采用有序统计量来表示前后滑窗的背景杂波功率水平，再将前后局部估计相加作为总的背景杂波功率水平估计。计算分析了MOSOS-CFAR检测器的各种性能，分析表明，MOSOS-CFAR检测器在均匀背景杂波中的检测性能良好，和MGO-CFAR检测器的检测性能相近；抗杂波边缘能力良好，但是略差于MGO-CFAR检测器；在多目标环境中的检测性能优秀，当干扰目标数少于R-k1-k2时，检测器的检测性能下降很少。
This paper first studies our nation's certain type of Radar's MGO-CFAR detector , mainly analyzing the detector's performance under homogeneous background, multiple targets situation and clutter edge situation. We derive the analytic expressions of false alarm probabilities and detection probabilities under various situations. Also, we drew the detector's various performance curves by using MATLAB. The result shows that the MGO-CFAR detector has good detection ability under homogenous background .The detection ability of the MGO-CFAR detector is only a little bit worse than that of the CA-CFAR detector. But its detection performance is not so good under multiple targets situation. The MGO-CFAR detector's detection performance degrades dramatically when there is one interfering target in the reference window. Taking account of the concept of ordered statistics, this paper presents MOSOS-CFAR detector for avoiding the original detector's flaws. In the forth and back windows ,the MOSOS-CFAR detector uses the ordered statistics as the background cutter power level of the two windows, and the sum of the forth and back local estimation as the total estimation of background clutter power level. the various performance of the MOSOS-CFAR detector was analyzed. The result shows that the MOSOS-CFAR detector has good performance under the homogenous background, almost the same as that of the MGO-CFAR detector; good performance against clutter edge, excellent performance under multiple targets situation, the detector's detection performance dropped not much when the interfering target is less than R-k1-k2.
This paper first studies our nation's certain type of Radar's MGO-CFAR detector , mainly analyzing the detector's performance under homogeneous background, multiple targets situation and clutter edge situation. We derive the analytic expressions of false alarm probabilities and detection probabilities under various situations. Also, we drew the detector's various performance curves by using MATLAB. The result shows that the MGO-CFAR detector has good detection ability under homogenous background .The detection ability of the MGO-CFAR detector is only a little bit worse than that of the CA-CFAR detector. But its detection performance is not so good under multiple targets situation. The MGO-CFAR detector's detection performance degrades dramatically when there is one interfering target in the reference window. Taking account of the concept of ordered statistics, this paper presents MOSOS-CFAR detector for avoiding the original detector's flaws. In the forth and back windows ,the MOSOS-CFAR detector uses the ordered statistics as the background cutter power level of the two windows, and the sum of the forth and back local estimation as the total estimation of background clutter power level. the various performance of the MOSOS-CFAR detector was analyzed. The result shows that the MOSOS-CFAR detector has good performance under the homogenous background, almost the same as that of the MGO-CFAR detector; good performance against clutter edge, excellent performance under multiple targets situation, the detector's detection performance dropped not much when the interfering target is less than R-k1-k2.
引文
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[2]Marcun J I. A Stasticl Theory of Detection by Pulsed Radar and Mathematical Appendix.IRE Trans.on IT,1960,6(2):259~267
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[5]Rohling H. Radar CFAR Thresholding in Clutter and Multiple Target Situation .IEEE Trans.on AES ,1983,19(4):608~621
[6]Wilson S L.Two CFAR Algorithms for Interfering Targets and Nonhomogeneous Clutter.IEEE Trans. On AES.1993,29(1):57~72
[7Himonas S D,Barkat M,Varshney P V. CFAR Detection for multiple Target Situation,IEEE Proc.-F,1989,136(5):193~209
[8]Gandhi P P, Kassam S A. Analysis of CFAR Processors in Nonhomogeneous Background. IEEE Trans. On AES,1988,24(4):427~445
[9]Levanon N. Detection Loss due to Interfering Targets in Ordered Statistic CFAR. IEEE Trans. On AES,1988,24(6):678~681
[10] He You (何友). Leistungsffihigkeit der Order Statistics Constant False Alarm Rate (OS--CFAR)Schaltung vor einem Weibull-St6rhintergrund. Ortung and Navigation, 1993,20(2): 133~ 155
[11]Ritcey J A Hwang J N Detection Performance and Systolic Architectures for OS-CFAR Detectors. IEEE International Radar Conference,1990:112~116
[12]Moore J D ,Lawrence N B.Comparison of Two CFAR Methods Used with Square Law Detection of Swerling 1 Targets.IEEE International Radar Conference,1980:403~409
[13]张贤达.现代信号处理,清华大学出版社,1995
[14]Barboy B,Lomes A,Perkaiski E.Cell-Averaging CFAR for Multiple Target Situations.IEE Proc.-F,1986,133(2):176~186
[15]Finn H M.A CFAR Design for a Window Spanning two Clutter Field .IEEE Trans, on AES,1986,22(1):155~169
[16]齐国青。单元平均恒虚警检测器性能的改善。In:Proc.of CCSP,1992:517~520
[17]张贤达，保铮。非平稳信号处理。国防工业出版社，1998
[18]何友，Rohling H.有序统计恒虚警（OS-CFAR）检测器在韦布尔干扰背景中的性能。电子学报，1995，23(1) 79~84
[19]何友，关键。雷达自动检测与恒虚警处理。清华大学出版社，1999
[20]沈一鹰，刘永坦。复信号检测中门限估计的野值剔除.现代雷达，1999，21(3)
[21]Conte E,Lops M,Ricci G.Radar Detection in K-distributed Clutter .IEEE Proc.1994,141(2)
[22]Thrunk G V,Gordon W B,Cantrell H,False Alarm Control using Doppler Estimation.IEEE Trans .on AES ,1990,26(1):146~152
[23]Kalson S Z.Adaptive Array CFAR Detection .IEEE Trans.on AES,1995,31(2):534~542
[2]Marcun J I. A Stasticl Theory of Detection by Pulsed Radar and Mathematical Appendix.IRE Trans.on IT,1960,6(2):259~267
[3]Swerling P.Probability of Detection for Fluctuating Targets.IRE Trans.on IT,1960,6(2):269~308
[4]Schleler D C.Automatic Detection and Radar Data Processing .Dehan ,Mass.:ARTECH House,1980
[5]Rohling H. Radar CFAR Thresholding in Clutter and Multiple Target Situation .IEEE Trans.on AES ,1983,19(4):608~621
[6]Wilson S L.Two CFAR Algorithms for Interfering Targets and Nonhomogeneous Clutter.IEEE Trans. On AES.1993,29(1):57~72
[7Himonas S D,Barkat M,Varshney P V. CFAR Detection for multiple Target Situation,IEEE Proc.-F,1989,136(5):193~209
[8]Gandhi P P, Kassam S A. Analysis of CFAR Processors in Nonhomogeneous Background. IEEE Trans. On AES,1988,24(4):427~445
[9]Levanon N. Detection Loss due to Interfering Targets in Ordered Statistic CFAR. IEEE Trans. On AES,1988,24(6):678~681
[10] He You (何友). Leistungsffihigkeit der Order Statistics Constant False Alarm Rate (OS--CFAR)Schaltung vor einem Weibull-St6rhintergrund. Ortung and Navigation, 1993,20(2): 133~ 155
[11]Ritcey J A Hwang J N Detection Performance and Systolic Architectures for OS-CFAR Detectors. IEEE International Radar Conference,1990:112~116
[12]Moore J D ,Lawrence N B.Comparison of Two CFAR Methods Used with Square Law Detection of Swerling 1 Targets.IEEE International Radar Conference,1980:403~409
[13]张贤达.现代信号处理,清华大学出版社,1995
[14]Barboy B,Lomes A,Perkaiski E.Cell-Averaging CFAR for Multiple Target Situations.IEE Proc.-F,1986,133(2):176~186
[15]Finn H M.A CFAR Design for a Window Spanning two Clutter Field .IEEE Trans, on AES,1986,22(1):155~169
[16]齐国青。单元平均恒虚警检测器性能的改善。In:Proc.of CCSP,1992:517~520
[17]张贤达，保铮。非平稳信号处理。国防工业出版社，1998
[18]何友，Rohling H.有序统计恒虚警（OS-CFAR）检测器在韦布尔干扰背景中的性能。电子学报，1995，23(1) 79~84
[19]何友，关键。雷达自动检测与恒虚警处理。清华大学出版社，1999
[20]沈一鹰，刘永坦。复信号检测中门限估计的野值剔除.现代雷达，1999，21(3)
[21]Conte E,Lops M,Ricci G.Radar Detection in K-distributed Clutter .IEEE Proc.1994,141(2)
[22]Thrunk G V,Gordon W B,Cantrell H,False Alarm Control using Doppler Estimation.IEEE Trans .on AES ,1990,26(1):146~152
[23]Kalson S Z.Adaptive Array CFAR Detection .IEEE Trans.on AES,1995,31(2):534~542