| 摘要: |
| 近年来，对机动目标参数快速估计方法的研究受到了广泛关注。然而，许多已有的参数估计算法存在精度与计算量相矛盾的问题。此外，当同时对多个机动目标参数进行估计时，传统的时频类算法会存在交叉项的干扰。针对上述问题，注意到雷达回波信号的高阶相邻自相关函数 （Higher-Order Adjacent Cross Correlation Function， HACCF)的展开式中，自相关项是与相邻延时无关的常数项，而交叉项则是以相邻延时为变量的函数。基于该特点，提出一种快速的估计多机动目标参数的估计方法。该方法先对信号的HACFF求均值以提取出自相关项，实现对交叉项的有效抑制；在此基础上进一步估计自相关项的频率，从而准确估计出机动目标的加速度等参数。与传统方法相比，该方法有如下优点： 1) 运算量小，能快速估计出机动目标参数； 2） 能同时估计出多个机动目标的参数； 3） 估计精度高。 |
| 关键词: 雷达 机动目标 参数估计 时频分析 |
| DOI：DOI: 10.3969/j.issn.1672-2337.2019.01.010 |
| 分类号:TN957.51 |
| 基金项目:国家自然科学基金重点项目(No.61731006)； 国家自然科学基金(No.61671137，61371184)； 四川省科技计划项目(No.2017GZ0345) |
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| A Fast Parameter Estimation Method for Multiple Maneuvering Targets |
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CHEN Zhuo1, HU Heng，XIAO Saijun
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1.University of Electronic Science and Technology of China, Chengdu 611731, China;2.2.China University of Geosciences, Wuhan 430074, China;3.3.Foshan Power Supply Bureau, Guangdong Power Grid Company, Foshan 528500, China
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| Abstract: |
| In recent years, the study on fast estimation methods of maneuvering target parameters has attracted wide attention. However, many existing parameter estimation algorithms have many problems, such as the contradiction between precision and calculation quantity. In addition, when the parameters of multiple maneuvering targets are estimated at the same time, the traditional time-frequency algorithms have cross-term interference. According to the above problems, this paper notices the autocorrelation item is constant and independent of the adjacent time delay while the cross term is a function of the adjacent time delay in the higher-order adjacent autocorrelation function (HACCF) expansion of radar echo signal. On this basis, a fast parameter estimation method for multiple maneuvering targets is proposed in this paper. The method firstly takes the mean extraction of the signals HACFF to extract the auto items, and inhibits the cross term. Then we can estimate the frequency of auto items further and get accurate estimation of maneuvering target acceleration. Compared with traditional methods, this method has the following advantages: 1) It has small calculation and can quickly estimate the maneuvering target parameters； 2) The proposed algorithm can estimate the parameters of multiple maneuvering targets simultaneously; 3) High accuracy. |
| Key words: radar maneuvering target parameter estimation time-frequency analysis |
