Method and apparatus for effecting a wireless exchange of data between a stationary station and moving objects
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United States of America Patent
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-
May 26, 1998
Issued Date -
N/A
app pub date -
Dec 11, 1996
filing date -
Jun 1, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for effecting a wireless exchange of data between a stationary station and transmitter/receivers on board objects, particularly vehicles moving relative to the stationary station. The reception profiles of an antenna array having a plurality of receiving antennas is directed electronically onto an object. The transmitter/receivers on the object transmit, in response to the received signal, an answer signal having the same carrier frequency as the signal received and having a level which is proportional to the level of the signal received. In the antenna array, a transmitting antenna is associated with each receiving antenna, and the transmitting antenna sends out signals having a transmission profile which corresponds to the reception profile of the receiving antenna. The damping factors of transmission profile and reception profile are thereby multiplied by each so that two relatively simple circuits are necessary in order to achieve a desired high side-lobe damping.
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