Vehicle inclination detecting device

摘要

In a vehicle inclination detecting device, a receiving unit includes a switching unit for alternately switching between a received signal from a first receiving antenna and a received signal from a second receiving antenna to alternately output the received signals to an orthogonal detector. The orthogonal detector carries out orthogonal detection on each of the two received signals from the switching unit and an oscillating signal from an oscillator by using an identical line.

主权项

1. A vehicle inclination detecting device comprising:
a transmitting unit disposed in a vehicle, for emitting a transmission signal which is acquired by rotating a phase of an oscillating signal having a predetermined frequency as a radio wave from a transmitting antenna; a first switching unit for alternately switching between a first received signal which a first receiving antenna acquires by receiving said radio wave reflected from a ground surface and a second received signal which a second receiving antenna acquires by receiving said radio wave reflected from said ground surface to alternately output said first received signal and said second received signal; a second switching unit for switching between said first received signal or said second received signal from said first switching unit and said transmission signal which said second switching unit acquires from said transmitting unit to alternately output said first received signal or said second received signal and said transmission signal; an orthogonal detection unit for carrying out orthogonal detection on said first received signal from said second switching unit and said oscillating signal and carrying out orthogonal detection on said second received signal from said second switching unit and said oscillating signal to alternately get a first amplitude and a first phase and a second amplitude and a second phase, and for carrying out orthogonal detection on said transmission signal from said second switching unit and said oscillating signal to get a third amplitude and a third phase; and an angle of inclination arithmetic unit for referring to phase rotation linearity characteristics of said orthogonal detection unit which are computed from said third amplitude and phase to compute an angle of inclination of said vehicle with respect to said ground surface on a basis of said first amplitude and phase and said second amplitude and phase.