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- W2051298734 abstract "A radar reflector with controllable reflectivity has been proposed by one of the present authors. This reflector is capable of electrically controlling its radar cross section. By using this reflector as a target, information including an identification code at a reflector site can be sent to a radar site by the modulation of reflected echoes. Thus, we can build up a passive telemetry system consisting of radar, the reflectors and a demodulator device.Since the reflector is a passive device, it does not interfere with other communication systems. Furthermore, the system at the reflector site uses little power because it has no transmitter. Experiments on the ground and on the sea have been conducted successfully.This paper presents a method of acquiring data in the case of a rotating radar antenna, transmission codes which eliminated the inverting effect of the reflection on the sea, and a type of demodulation process. The evaluated result of this system from outdoor experiments is also presented.The reflector was put into practical use as a traffic monitoring system and tested over a long period. From the experimental results it was discovered that the demodulation method using automatic threshold selection based on the probability distribution was the most successful. Hence, from the foregoing, we are able to conclude that the system using the radar reflector with controllable reflectivity is useful in passive telemetry." @default.
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- W2051298734 date "1989-10-01" @default.
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- W2051298734 title "Passive telemetry using radar reflectors with controllable reflectivity" @default.
- W2051298734 doi "https://doi.org/10.1002/ecja.4410721004" @default.
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