FM-CW radar apparatus
First Claim
1. An FM-CW radar apparatus using a traveling wave antenna as a transmitting antenna, and comprising a means for varying in upward/downward directions the projection angle of a combined beam pattern of a transmitted wave radiated from said traveling wave antenna.
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Accused Products
Abstract
An FM-CW radar apparatus capable of detecting a stationary object, in particular, an overbridge, located above the road ahead in a simple manner uses a traveling wave antenna as a transmitting antenna, and includes a means for varying, in upward and downward directions the projection angle of a combined beam pattern of a transmitted wave radiated from the traveling wave antenna, and an overbridge is detected by varying the projection angle of the combined beam pattern in the upward direction using the varying means. Further, a phase shifter for varying the projection angle of the beam pattern in upward/downward directions by controlling the phase of the radio wave to be transmitted or received is provided on either a transmitting antenna or a receiving antenna or on a transmitting/receiving antenna, and an overbridge is detected by controlling the phase shifter and varying the projection angle of the beam pattern in the upward direction.
39 Citations
6 Claims
- 1. An FM-CW radar apparatus using a traveling wave antenna as a transmitting antenna, and comprising a means for varying in upward/downward directions the projection angle of a combined beam pattern of a transmitted wave radiated from said traveling wave antenna.
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5. A two-antenna FM-CW radar apparatus comprising a phase shifter for varying the projection angle of a beam pattern in upward/downward directions by controlling the phase of a radio wave to be transmitted or received, wherein said phase shifter is provided on either a transmitting antenna or a receiving antenna.
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6. A single-antenna FM-CW radar apparatus comprising a phase shifter for varying the projection angle of a beam pattern in upward/downward directions by controlling the phase of a radio wave to be transmitted or received, wherein said phase shifter is provided on a transmitting/receiving antenna.
Specification