Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter
Patent
1992-08-14
1994-01-18
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Transmitter
342159, 342196, G01S 7292, G01S 7285
Patent
active
052802884
ABSTRACT:
An interference avoidance system used in conjunction with a vehicular target detection system. The microwave transceiver section of the vehicular target detection system, in which the present invention is incorporated, transmits and receives time-multiplexed microwave signals having at least two channels (frequencies) spaced about 250 kHz apart. The time-multiplexed transmit signal is transmitted and strikes objects (targets) in the environment, and a portion of the transmit signal is reflected back the antenna. A difference signal having a frequency equal to the difference between the frequency of the transmit and the received signal is generated, digitized, and a Fast Fourier Transform (FFT) is performed on the digitized difference signal. A microcontroller analyzes the energy spectrum to determine whether there is interference present. If such interference is present, the microcontroller causes the transmit frequency to change until a frequency is found which is relatively free of the interference.
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Malan Van R.
Sherry Russell F.
Woll Jerry D.
Sotomayor John B.
Vorad Safety Systems, Inc.
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