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Development of Electromagnetic Noise Source Searching System Using Synthetic Aperture Method

合成孔径法电磁噪声源搜索系统的研制

基本信息

批准号：
02555090
负责人：
NAGASAWA Yoji
金额：
$ 2.62万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555090/
关键词：
Mills' Cross method Fresnel region Synthetic aperture antenna Noise source searching system 電磁雑音探査システム合成開口法

项目摘要

The electromagnetic noise sources searching system is composed of four sub-systems.(1) Antenna sub-system : nine dipole antennae. including a standard antenna.(2) Channel selector sub-system : eight input/one output coaxial switchig system(3) Amplitude and phase measuring sub-system : measuring phase to received signal. by a standard antenna. and reserved amplitude for each antenna by a vector-volt meter.(4) System control sub-syste : Whole system control. data collection. and preprocessing. Each sub-systems were connected by interfaces. whichi were our own work completely. Data was measured automatically by systemeontrol sub-systeolSoftware has been developed for automatic measurement and data processing. (1) software for system control. (2) software for pre-proseccing of recorded data. (3) software for data convert to data proseecing system on an engineering workstation. (4) software for data processing and display representation. (5) software for numerical simulation.Electromagnetic noise search system which uses Mills' Cross Method. can be applied to Fresnel region. The system is restricted only ten times wavelength of synthetic aperture. So. Fresnel region is 200 times of wavelength rfom center of aperture. In our experiment. the field was restricted 100 times of wavelength and the region of 10 times of wavelength in each x-axis andy-axis was moved everywhere in the region of 100 times of wavelength square. The system estimated the wave source using numerical simulation. The system could estimate the wave source under 100 times of wavelength square. We also estimated the accuracy of array antenna using estimation function of wave source estimation. The results was that the requirement for the accuracy of crossing angle was very rigid. The error of the crossing angle required +-1 degree to keep the same accuracy everywhere in the region of 10 times of wavelength in each axis.

电磁噪声源搜索系统由四个子系统组成。(1)天线子系统：九个偶极天线。包括标准天线。(2)通道选择子系统：八输入/一输出同轴开关系统。（3）幅相测量子系统：测量接收信号的相位。一个标准的天线。并通过矢量电压表为每个天线保留幅度。(4)系统控制子系统：全系统控制。数据收集。和预处理。各子系统之间通过接口连接。完全是我们自己的作品数据由系统控制子系统自动测量，并开发了自动测量和数据处理软件。(1)系统控制软件。(2)用于预处理记录数据的软件。(3)用于将数据转换到工程工作站上数据处理系统软件。(4)用于数据处理和显示表示的软件。(5)数值模拟软件。采用米尔斯十字法的电磁噪声搜索系统。可应用于菲涅尔区。该系统仅受10倍合成孔径波长的限制。是的菲涅耳区是孔径中心波长的200倍。在我们的实验中。场被限制为100倍波长，并且在每个x轴和y轴中的10倍波长的区域在100倍波长的区域中到处移动。该系统采用数值模拟的方法对波源进行了估计。该系统可对100倍波长范围内的波源进行估计。利用波源估计的估计函数对阵列天线的精度进行了估计。结果表明，对交叉角的精度要求非常严格。交叉角的误差要求± 1度，以在每个轴上的10倍波长区域内处处保持相同的精度。