Title:
RADAR APPARATUS
Document Type and Number:
Japanese Patent JP3344368
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a radar apparatus that can detect instantaneously a failure when the failure which cannot obtain a beat signal is generated irrespective of whether an object exists or not on radar transmission-reception waves, and obtain further a failure-detecting method.
SOLUTION: In the radar apparatus having a transmitting-receiving antenna 4 which is excited in a set band, an oscillator is oscillated at a frequency which is excited in a measurement, and at a frequency which is not excited. Thereby, at the nonexciting frequency, reflection is generated due to the impedance mismatching of the antenna, and a DC component is generated from a mixer 5. As a result, when the radar apparatus is normal in the diagnosis of a failure, the output of the mixer becomes a state that the DC component is increased. When a failure that the output is cut off in, e.g. a transmission system, the DC component is reduced, and the failure can be detected by comparing the DC component with a set threshold value.
Inventors:
Naofumi Inomata
Application Number:
JP15576599A
Publication Date:
November 11, 2002
Filing Date:
June 02, 1999
Export Citation:
Assignee:
NEC
International Classes:
G08G1/16; G01S7/40; G01S13/34; G01S13/60; (IPC1-7): G01S13/34; G01S7/40; G08G1/16
Domestic Patent References:
| JP1010227A | ||||
| JP1152052A | ||||
| JP9145824A | ||||
| JP1062525A | ||||
| JP50140290A | ||||
| JP7198826A | ||||
| JP5759181A |
Attorney, Agent or Firm:
Nobuo Takahashi (3 outside)
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