Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1997-11-21
1999-09-28
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342 71, 700301, G01S 1393
Patent
active
059595701
ABSTRACT:
An automotive Forward Looking Sensor (FLS) including a transmit antenna, a receive antenna and a receiver circuit for determining whether RF leakage from the transmit antenna to the receive antenna exceeds a predetermined threshold level. If the leakage exceeds the predetermined threshold level, then the antenna is blocked, as may be caused by mud, salt, ice, etc. In one embodiment, the received RF signal is processed by a digital signal processor performing a Fast Fourier Transform (FFT) and the energy content of the received RF signal within a predetermined range of frequencies corresponding to approximately zero Doppler is assessed to determine whether such energy content exceeds the predetermined threshold level.
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Automotive Anticollision Radar, Yukio Takimoto and Minoru Kotaki, Applied Microwave Fall 1992, pp. 70, 72, 74-78, 80-82.
Raytheon Company
Sotomayor John B.
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