基于Prewitt算子的X波段雷达有效波高反演研究

doi:10.12305/j.issn.1001-506X.2022.04.14

摘要/Abstract

摘要：

在X波段雷达有效波高获取的工程应用中, 无现场仪器校准获取波高的方法一直是人们所致力研究的。基于雷达阴影调制特性无校准有效波高反演的方法是一种可进行工程应用的方法, 但该方法采用差分算子获取的雷达图像阴影阈值的准确度和稳定性不高, 影响有效波高的反演精度。本文针对这一问题, 采用Prewitt算子对雷达图像的边缘检测算法进行了改进, 该算子能更加精准地定位雷达图像阴影区与非阴影区的边缘。通过两次不同地点和不同时间获得的试验数据进行验证, 结果表明Prewitt算子能够提高图像阈值选取的准确度和有效波高的反演精度, 两次反演结果与浮标数据相比平均绝对误差在15%以内。

关键词: X波段雷达, 有效波高, 边缘检测, Prewitt算子

Abstract:

In the engineering application of obtaining significant wave height of X-band radar, how to obtain wave height without in-situ instrument calibration is always the problem that researchers have been devoting themselves to.The uncalibrated significant wave height retrieving method based on the radar shadow modulation characteristics can be applied in engineering, but the accuracy and stability of the radar image shadow threshold which is based on the use of difference operator is not ideal, which affects the accuracy of estimating significant wave height. To solve this problem, this paper improves the edge detection algorithm of radar images by using Prewitt operator, which can locate the edge of the shadowed and non-shadowed area more accurately. Verified by the experimental data obtained at two different places and two different time, using the Prewitt operator can improve the accuracy of image threshold and the precision of estimating significant wave height. The average absolute error between the two retrieval results and the buoy data is less than 15%.

Key words: X-band radar, significant wave height, edge detection, Prewitt operator

中图分类号:

TN959.72

姚智超, 楚晓亮, 范筠益, 王峰. 基于Prewitt算子的X波段雷达有效波高反演研究[J]. 系统工程与电子技术, 2022, 44(4): 1182-1187.

Zhichao YAO, Xiaoliang CHU, Junyi FAN, Feng WANG. Retrieving significant wave height based on Prewitt operator fromX-band radar images[J]. Systems Engineering and Electronics, 2022, 44(4): 1182-1187.

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参考文献 21

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参数名称	参数指标
脉冲功率/kW	25
极化方式	HH
天线尺寸/m	2.4
水平波束宽度/(°)	0.95
垂直波束宽度/(°)	20
脉冲重复频率/Hz	3 000
脉冲宽度/μs	0.07

时间(日/时)	地点	差分算子阈值范围	差分算子波动差值	Prewitt算子阈值范围	Prewitt算子波动差值
10/10	龙口	825~1 437	612	736~1 210	474
11/10	龙口	983~1 599	614	857~1 332	475
12/10	龙口	1 117~1 597	480	861~1 357	496
13/10	龙口	914~1 564	650	714~1 256	542
15/10	龙口	814~1 634	820	759~1 325	566
10/10	晋江	1 186~1 822	614	989~1 514	525
10/12	晋江	1 190~1 909	719	1 032~1 654	622
10/14	晋江	1 394~1 968	574	1 115~1 591	476
10/16	晋江	1 048~1 523	475	888~1 449	561
10/18	晋江	892~1 754	862	761~1 486	724

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