基于zr log(z)期望的K分布参数估计
doi: 10.3724/SP.J.1146.2006.00829
Estimation of the Parameters of K-distribution Based on zr log(z) Expectation
-
摘要: 该文用zr log(z) 期望扩展了基于z log(z)期望的K分布参数估计方法，导出了基于zr log(z) 期望的K分布参数估计表达式。分析比较了阶数r取不同值时，基于zr log(z)期望的参数估计精度。仿真结果表明，在K分布雷达尖杂波参数范围内，阶数r小于1时，基于zr log(z)期望的参数估计精度高于z log(z)期望法和正规化对数估计法。
-
关键词:
- K分布; 雷达杂波; 矩方法; 参数估计
Abstract: The estimation of the parameters of K-distribution based on the z log(z) expectation approach is extended to zr log(z) expectation. The parameter estimation expression of the based on zr log(z) expectation is derived. When r is taken different values, the accuracies of the estimations based on the zr log(z) expectation are analyzed and compared with one another. Simulation results show that in the parameters range of K distribution radar spiky clutter, the estimation based on zr log(z) expectation is more accurate than z log(z) expectation and Normalised Log Estimator (NLE) approaches when r is less than unity. -
[1] Jakeman E and Pusey P N. A model for non-Rayleigh sea echo [J].IEEE Trans. on Antennas Propag.1976, 24(6):806-814 [2] Ward K D. Compound representation of high resolution sea clutter [J].Electron. Lett.1981, 17(16):561-563 [3] Armstrong B C and Griffiths H D. CFAR detection of fluctuating targets in spatially correlated K-distributed clutter [J]. IEE Proc-F, 1991, 138(2): 139-152. [4] Joughin I R, Percival D B, and Winebrenner D P. Maximum likelihood estimation of K-distribution parameters for SAR data [J]. IEEE Trans on Geosciences and Remote Sensing, 1993, 31(5): 989-999. [4] Blacknell D. Comparison of parameter estimators for K- distribution [J].IEE Proc.-Radar, Sonar, Navig.1994, 141(1):45-52 [5] Roberts W J J and Furui S. Maximum likelihood estimation of K-distribution parameters via the expectation- maximization algorithm [J].IEEE Trans. on Signal Processing.2000, 48(12):3303-3306 [6] Wachowiak M P, Smolkov R, Zurada J M, and Elmaghraby A S. Estimation of K distribution parameters using neural networks [J].IEEE Trans. on Biomedical Engineering.2002, 49(6):617-620 [7] Blacknell D and Tough R J A. Parameter estimation for the K-distribution based on [zlog(z)] [J].IEE Proc.- Radar, Sonar, Navig.2001, 148(6):309-312 [8] Iskander D R and Zoubir A M. Estimation of the parameters of the K-distribution using higher order and fractional moment s[J]. IEEE Trans. on AES, 1999, 35(4): 1453-1457. [9] Oliver C J. Optimum texture estimators for SAR clutter [J]. J. Phys. D: Phys. 1994, 26(4): 1824-1835. [10] Lombardo P and Oliver C J. Estimation of texture parameters in K-distributed clutter [J].IEE Proc.-Radar, Sonar, Navig.1994, 141(4):196-204 [11] Raghavan R S. A method for estimating parameters of K-distributed clutter [J]. IEEE Trans. on AES, 1991, 27(2): 238-246. -
计量
- 文章访问数: 3244
- HTML全文浏览量: 87
- PDF下载量: 1290
- 被引次数: 0
下载:
