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Radar system and characteristic adjustment method thereof
| Details |
Inventors: Ishii, Toru; Nakanishi, Motoi; Nishimura, Tetsu;
Assignee: Murata Manufacturing Co., Ltd. (Kyoto-fu, JP)
Primary Examiner: Sotomayor; John B.
Assistant Examiner:
Attorney, Agent or Firm: Dickstein, Shapiro, Morin & Oshinsky, LLP.
A radar system and a characteristic adjustment method for the radar system are provided, in which a control voltage waveform of a voltage controlled oscillator for frequency-modulating a sending signal can be set in a short time without increasing the required amount of memory. In adjusting time-varying characteristics of a voltage signal for frequency modulation on a voltage controlled oscillator determining a sending frequency, the time-varying characteristics of the voltage signal for frequency modulation are adjusted to optimize a form of a protrusion in signal intensity included in a frequency spectrum of a beat signal. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a radar system capable of setting a control voltage waveform of a voltage controlled oscillator for frequency-modulating a sending signal in a short time without increasing the required capacity of memory, and a characteristic adjustment method for the radar system.
A radar system according to the present invention comprises a voltage controlled oscillator for determining a sending frequency, a transmitter for sending a sending signal.
The sending signal includes an ascending modulation interval, wherein a frequency gradually increases, and a descending modulation interval, wherein the frequency gradually decreases, which are alternately repeated with time in a triangular waveform by applying a voltage signal for frequency modulation to the voltage controlled oscillator.
The radar system further includes a receiver for receiving a receiver signal including a reflected signal from a target, a frequency analyzer for obtaining data relating to a frequency spectrum of a beat signal that has a frequency difference between the sending signal frequency and the receiver signal frequency, whereby the radar system detects a relative distance or a relative speed of the target on the basis of the beat signal in the ascending modulation interval and the beat signal in the descending modulation interval.
The radar system also includes an adjuster for adjusting time-varying characteristics of the voltage signal for frequency modulation, and a data output device for outputting the data relating to the frequency spectrum.
By this configuration, the data relating to the frequency spectrum of the beat signal is read and the time-varying characteristics of the voltage signal for frequency modulation can be adjusted based on the data relating to the frequency spectrum.
Also, according to the present invention, the frequency analyzer may obtain a peak value of a protrusion of signal intensity included in the frequency spectrum as the data relating to the frequency spectrum
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