Peripheral monitor for monitoring periphery of vehicle
First Claim
1. A peripheral monitor for monitoring periphery of a vehicle comprising:
- variable frequency oscillating means that oscillates high-frequency signals of a commanded frequency;
a transmitting antenna that is mounted inside of a cover disposed on a surface of the vehicle, and transmits high-frequency signals transmitting through the cover;
a receiving antenna that receives reflected waves of the transmitted waves from any object;
a receiving level analyzer that analyzes signal level of said reflected waves, discriminates between a first reflected signal of the transmitted waves reflected from the mentioned cover and a second reflected signal reflected from any object on the basis of the received reflected signals, and outputs data of receiving timing and a signal level of the first and second reflected signals respectively; and
a data processor that processes the data and computes a distance to the object, and detects a frequency at which level of the first reflected signal is minimized and commands the mentioned variable frequency oscillator to oscillate at this frequency.
1 Assignment
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Accused Products
Abstract
The invention solves a problem of fluctuation in performance in the conventional peripheral monitor for monitoring periphery of a vehicle that measures a distance to other vehicle or any other object by transmitting radio waves and informs a driver of the distance due to variation in environmental conditions such as water drop sticking onto the cover. A peripheral monitor 1 including a transmission antenna 2 for radiating transmission waves through the cover, a receiving antenna 3 for receiving reflected waves through the cover, and a data processor for measuring a distance to any object are disposed together in a cover 7. A transmission frequency at which reflected wave quantity is minimized is detected by detecting a first reflected signal level from the cover 7, and this frequency is a command to a variable frequency oscillator to conduct a transmission at this frequency at all times.
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Citations
6 Claims
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1. A peripheral monitor for monitoring periphery of a vehicle comprising:
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variable frequency oscillating means that oscillates high-frequency signals of a commanded frequency;
a transmitting antenna that is mounted inside of a cover disposed on a surface of the vehicle, and transmits high-frequency signals transmitting through the cover;
a receiving antenna that receives reflected waves of the transmitted waves from any object;
a receiving level analyzer that analyzes signal level of said reflected waves, discriminates between a first reflected signal of the transmitted waves reflected from the mentioned cover and a second reflected signal reflected from any object on the basis of the received reflected signals, and outputs data of receiving timing and a signal level of the first and second reflected signals respectively; and
a data processor that processes the data and computes a distance to the object, and detects a frequency at which level of the first reflected signal is minimized and commands the mentioned variable frequency oscillator to oscillate at this frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification