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Seed Measurement by Radio Wave Spatial Filter

通过无线电波空间滤波器进行种子测量

基本信息

批准号：
05805038
负责人：
WATANABE Kajiro
金额：
$ 1.34万
依托单位：
Hosei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05805038/
关键词：
Seed measurement Spatial filter Radio wave Multipass Fading GPS Sensor fusion Kalman filter DGPS センサフェーションセンサ・フューション

项目摘要

The electric field intensity of radio waves generated and propagated from a broadcasting station show stochastically periodic spatial pattern due to the multi-pass fading phenomenon. This research aims at developing a new type of speedometer by applying the spatial filtering technique to the change in the electric filed intensity. Further here we consider use of radio waves from satellite for GPS and the fusion of GPS signal with local sensors in the vehicle.The research project was scheduled to investigate the following 4 items, i.e.,(1) investigation of multi-pass fading phenomenon as a spatial measure for spatial filter, (2) development of quick response tuner, (3) use of radio waves from satellite for GPS,and (4) fusion of GPS signal and signals from local vehicle sensors. We have the following results ;(1) As a spatial measure for the spatial filter, the low frequency change in the electric field intensity of radio wave causes error. Spatial difference by 2 antennae of the electric field intensities reduces the low frequency change and yields accurate speed measurement. More antennae than 2 leads to more accurate measurement.(2) Quick response tuner is required to detect the electric field intensity when detected driving vehicle. A tuner with less Q-value was newly developed by using log-amplifier. The tuner can detect the electric field intensity from a vehicle driving faster than 100km/h.(3) We tried to use the change in the intensity of radio waves from satellites for GPS.But we could not find if or if not it can be used, because the sampling interval of the receivers was too slow and essentially, the satellites are moving.(4) The positioning information and those from vehicle local sensors (speedometer and rate gyro) are fused and integrated by applying Kalman filtering technique. The accuracy of positioning is so good that no map information is required.

由于多通衰落现象，广播电台产生和传播的无线电波的电场强度表现出随机周期性的空间格局。本研究的目的是将空间滤波技术应用于电场强度的变化，开发一种新型的速度计。进一步，我们考虑使用来自卫星的无线电波进行GPS定位，并将GPS信号与车辆中的本地传感器融合。本课题拟开展以下4项研究，即：(1)研究多通衰落现象作为空间滤波的空间度量；(2)开发快速响应调谐器；(3)利用卫星无线电波进行GPS定位；(4)GPS信号与本地车辆传感器信号融合。我们得到了以下结果：(1)作为空间滤波器的空间度量，无线电波电场强度的低频变化会导致误差。两个天线电场强度的空间差异减小了低频变化，从而得到准确的速度测量结果。天线数量多于2个，测量更加精确。(2)当检测到车辆行驶时，需要快速响应调谐器来检测电场强度。利用对数放大器，研制了一种低q值调谐器。调谐器可以检测到行驶速度超过100公里/小时的车辆的电场强度。我们试图利用卫星无线电波强度的变化来定位GPS。但是我们不能确定它是否可以使用，因为接收器的采样间隔太慢，而且卫星在移动。(4)采用卡尔曼滤波技术，将定位信息与车载局部传感器（速度计和速度陀螺）的定位信息进行融合和集成。定位精度很高，不需要地图信息。