Radar detector and the adjustment system and method thereof
First Claim
1. A radar detector comprising:
- an antenna for receiving radar signals;
a voltage controlled oscillator which receives a controlled signal and generates a signal of a frequency corresponding thereto;
a receiving section which demodulates the radar signal received by said antenna based on the output signal of said voltage controlled oscillator;
a sweep signal generating section which generates and supplies a sweep signal to said voltage controlled oscillator as said controlled signal;
a memory section which stores data indicating the relation between said sweep signal and oscillating frequency in advance; and
a controlling section which, after detecting a radar signal demodulated by said receiving section, determines the received frequency of said radar signal by comparing the controlled signal of said voltage controlled oscillator with the data in said memory section.
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Accused Products
Abstract
Disclosed is a radar detector for frequency sweeping a wide band range by using a VCO circuit to detect a radar signal, wherein the frequency precision of the received band can be improved by using comparatively simple and inexpensive circuits. This radar detector comprises an antenna for receiving radar signals, a voltage controlled oscillator which receives a controlled signal and generates a signal of a frequency corresponding thereto, a receiving section which demodulates the radar signal received by said antenna based on the output signal of said voltage controlled oscillator, a sweep signal generating section which generates and supplies a sweep signal to said voltage controlled oscillator as said controlled signal, a memory section which stores data indicating the relation between said sweep signal and oscillating frequency in advance, and a controlling section which, after detecting a radar signal demodulated by said receiving section, decides the received frequency of said radar signal by comparing the controlled signal of said voltage controlled oscillator with the data in said memory section. The memory section stores the actual characteristics of the voltage controlled oscillator, so that a correct distinction is possible.
22 Citations
16 Claims
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1. A radar detector comprising:
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an antenna for receiving radar signals; a voltage controlled oscillator which receives a controlled signal and generates a signal of a frequency corresponding thereto; a receiving section which demodulates the radar signal received by said antenna based on the output signal of said voltage controlled oscillator; a sweep signal generating section which generates and supplies a sweep signal to said voltage controlled oscillator as said controlled signal; a memory section which stores data indicating the relation between said sweep signal and oscillating frequency in advance; and a controlling section which, after detecting a radar signal demodulated by said receiving section, determines the received frequency of said radar signal by comparing the controlled signal of said voltage controlled oscillator with the data in said memory section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radar detector adjusting system, comprising:
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a radar detector comprising an antenna for receiving radar signals, a voltage controlled oscillator which receives a controlled signal and generates a signal of a frequency corresponding thereto, a receiving section which demodulates the radar signal received by said antenna based on the output signal of said voltage controlled oscillator, a sweep signal generating section which generates and supplies a sweep signal to said voltage controlled oscillator as said controlled signal, a memory section which stores data indicating the relation between said sweep signal and oscillating frequency in advance, and a controlling section which, after detecting a radar signal demodulated by said receiving section, decides the received frequency of said radar signal by comparing the controlled signal of said voltage controlled oscillator with the data in said memory section; a data measuring and write-in device comprising a controlled signal generator for supplying a controlled signal to the voltage controlled oscillator of said radar detector, and a data writer for writing data into the memory section of said radar detector under predetermined conditions when said voltage controlled oscillator generates a predetermined frequency; and a frequency measuring device for measuring the oscillation frequency of said voltage controlled oscillator of the radar detector. - View Dependent Claims (13, 14, 15)
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16. A radar detector adjusting method for a radar detector which comprises an antenna for receiving radar signals, a voltage controlled oscillator which receives a controlled signal and generates a signal of a frequency corresponding thereto, a receiving section which demodulates the radar signal received by said antenna based on the output signal of said voltage controlled oscillator, a sweep signal generating section which generates and supplies a sweep signal to said voltage controlled oscillator as said controlled signal, a memory section which stores data indicating the relation between said sweep signal and oscillating frequency in advance, and a controlling section which, after detecting a radar signal demodulated by said receiving section, decides the received frequency of said radar signal by comparing the controlled signal of said voltage controlled oscillator with the data in said memory section, said radar detector adjusting method comprising:
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a first step of conducting the setting of the radar received band; a second step of setting the oscillation frequency of the voltage controlled oscillator of said radar detector to a predetermined frequency; a third step of converting the controlled voltage of said voltage controlled oscillator to a digital value when the frequency setting has been conducted at said second step; and a fourth step of storing said converted data in the memory section of said radar detector, wherein said first through fourth steps are repeated until the setting of all radar received bands has been conducted.
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Specification