Pulse radar apparatus
AssigneeFujitsu Limited
InventorsSatoshi Ishii, Yoshikazu Dooi, Hiroyuki Yatsuka, Tetsuo Seki
Life of this patent
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Abstract
A pulse radar apparatus uses different frequencies, for example, frequencies one of which is a multiple or a submultiple of the other for a signal which becomes a reference of a control pulse for controlling a gate operation for a reception signal and a signal which becomes a base of generation of a transmission pulse. As a result, even if noise is caused by the gate operation, its influence can be removed in the processing of reception signals having different frequencies.
Claims12
A radar apparatus detecting a target by transmitting a pulse signal, comprising:
- a first signal generating unit generating a first signal, which becomes a base of generation of a transmission pulse;
- a second signal generating unit generating a second signal that has a frequency which is a multiple or a submultiple of the first signal, a phase angle of 0 for the second signal intermittently matching that for the first signal;
- a control pulse generating unit generating a control pulse signal by delaying the second signal;
- and
- a gate unit performing a gate operation for a reception signal by using the control pulse signal, wherein the reception signal is obtained from a detector.
A pulse radar apparatus detecting a target by transmitting a pulse signal, comprising:
- a signal delaying unit delaying a signal which becomes a base of generation of a transmission pulse;
- a control pulse generating unit generating a control pulse signal by using the delayed signal;
- a gate unit performing a gate operation for a reception signal by using the control pulse signal;
- and
- a reflection signal detecting unit detecting a reflection signal from a target which exists in a distance corresponding to a delay time by using an output of said signal delaying unit based on an output of said gate unit.
A pulse radar apparatus detecting a target by transmitting a pulse signal, comprising:
- a first signal generating unit generating a first signal, which becomes a base of generation of a transmission pulse;
- a second signal generating unit generating a second signal that has a frequency which is a multiple or a submultiple of the first signal, a phase angle of 0 for the second signal matching the first signal at least intermittently;
- a control pulse generating unit generating a control pulse signal by delaying the second signal;
- a gate unit performing a gate operation for a reception signal by using the control pulse signal;
- a signal delaying unit delaying the first signal according to a delay amount of the control pulse signal generated by said control pulse generating unit;
- and
- a reflection signal detecting unit detecting a reflection signal from a target which exists in a distance corresponding to a delay time by using an output of said signal delaying unit based on an output of said gate unit.
A pulse radar apparatus detecting a target by transmitting a pulse signal, comprising:
- a pulse transmitting unit outputting a transmission pulse signal by using a pulse signal generated from a signal which becomes a base of generation of a transmission pulse and a frequency-modulated continuous wave;
- a control pulse generating unit generating a control pulse signal by delaying the signal which becomes the base of generation of a transmission pulse;
- a gate unit performing a gate operation for a reception signal by using the control pulse signal, wherein the reception signal is obtained from a detector;
- and
- a modulation controlling unit controlling a frequency modulation width in frequency modulation, and/or a repetitive frequency of the modulation in response to a signal delay amount generated by said control pulse generating unit.
Dependencies are inferred from the claim text.