This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Speed Measurement of Vehicles by Radio Waves
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes a new method of measuring the absolute speed of moving objects such as people who are walking or running, running animals, vehicles, sailing boats and the like.
The method estimates speed using the time delay between spatial values (patterns) detected by the front and rear sensors which are separately disposed on an object and aligned in the direction of movement.
It is known that the electric field intensity of radio waves in the VHF/UHF range exhibit a spatial periodic pattern due to the multi-pass fading phenomenon. It is also known that this phenomenon is a source of noise in automotive telecommunications. In experiments we make use this pattern for speed measurement and investigate if the pattern can be used to provide a spatial value which permits the estimation of the speed of the above mentioned types of objects. From various viewpoints and we show that it can be used to provide accurate measurements and further provide a guide line of how to design a measuring system which operates on this concept.
Authors
Citation
Watanabe, K. and Kobayashi, K., "Speed Measurement of Vehicles by Radio Waves," SAE Technical Paper 910271, 1991, https://doi.org/10.4271/910271.Also In
References
- Fujimoto M. “Automobile Instrument Device,” Denki Shyoin Tokyo 1965
- Shiga H. Mizutani S. “Car Electronics,” Sankiadou Tokyo 1986
- Information Report “Speedometers and Tachometers,” SAEJ862 18.01 18.08 1981
- The Automobile Division of the Institute of Mechanical Engineers “Anti-Lock Breaking Systems for Road Vehicles Conference of Institution of Mechanical Engineers London 1985
- Idogawa T. Watai H. Ooba R. Takai K. “Automobile Speedometer by Using Correlation,” Trans. SICE 1 4 473 478 1975
- Naito T. Ookami Y. Kobayshi A. “Speed Measurement by The Spatial Filter,” Journal of SICE 7 11 761 772 1968
- Shirai M. “Measurement Method of Speed of Moving Vehicles,” 127 131 June 1982
- Kobayashi A. Ymaura T. Turutani Y. “Speed Measurement by Capacitive Spatial Filter.” SICE 22th-Annual Meeting 1979
- “Sensor Technology and its Application,” Industry Research 233 234 1984
- Yokoi R. “Aerial Measurement -Theory and Application Tijin shoin Tokyo 1979
- Kuwahara M. “Automobile “Telecommunication,” IECE 1985
- Okumura Y. Shinsi A. “Introduction to Automotive Telecommunication,” IECE 1986
- CQ hamradio “Antenna Handbook CQ publishing Tokyo 1970
- Mushiaki Y. “Antenna and Radio Wave Propagation,” Corona Publishing 1981