KR890017893A - Receiving band classification method and circuit of radar detector - Google Patents

Abstract

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Description

Receiving band classification method and circuit of radar detector

Since this is an open matter, no full text was included.

1 is a block diagram of the present invention, FIG. 2 is a detailed circuit diagram of the RF module during the first, and FIG. 3 is an output waveform diagram for each part of FIG.

Claims (4)

In the radar detector provided with a horn antenna, controlling the conversion operation of the RF module 11 and the RF module 11 which inputs a received signal from the horn 16 antenna and converts it into an FM signal by a conversion control signal. A conversion control circuit 11 for generating and outputting a triangular wave-shaped conversion control signal, a demodulator 12 for inputting and demodulating an FM signal from the RF module 10, and a demodulation signal of the demodulator 11 A comparator 13 comparing with the signal voltage and a sweeping pulse for controlling the period of the conversion control signal of the conversion control circuit 11 are generated, and the comparison signal of the comparator 13 is input to detect information with the comparison signal. The microcomputer 14 detects a frequency band of a received signal and generates a display control signal by checking a phase difference between the information detection time and the sweep detection pulse after detecting a time, and a display control signal from the microcomputer 14. And a display unit for displaying a frequency band being received by inputting a call. The oscillator of claim 1, wherein the RF module generates a first local oscillator 21 having a first local oscillation signal having a first predetermined frequency, and receives a signal received from the horn antenna 16. A first amplifying circuit 22, which generates an intermediate frequency signal by mixing with a first local oscillation signal applied from 21), and amplifies the intermediate frequency signal output from the first mixing circuit 22 at a constant amplification factor. The second frequency increasing from the second predetermined number to the third predetermined number in accordance with the voltage rise of the modulation control signal applied from the intermediate frequency amplifier section 23 and the first conversion control signal generation section 11 A second local oscillator 24 generating a local oscillation signal, an intermediate frequency signal output from the intermediate frequency amplifier 23, and a second local oscillation signal output from the second local oscillator 24; The intermediate frequency signal and the second signal through an input line; And a second mixing circuit 25 for generating an FM signal by mixing the two signals such that the gain is increased in the vicinity of the frequency difference between the local oscillation signal and the fourth predetermined correction difference. . The frequency band of the local oscillation signal overlaps the upper band frequency band of the intermediate frequency signal when receiving the low frequency reception signal and the lower band frequency band of the intermediate frequency signal when the high frequency reception signal is received. And a first local oscillation signal having a constant frequency so as not to be generated. A receiving band classification method of a radar detector, comprising: a conversion synchronization process of generating a sweeping pulse, which is a reference signal for distinguishing reception bands, and generating a conversion control signal in the form of a triangular wave in synchronization with the sweeping pulse; A received signal conversion process of converting a frequency of the second local oscillation signal according to a generated voltage rise of the control signal and converting a received signal of a microwave frequency band into an FM signal of a frequency band according to a frequency band; Demodulated FM signal is compared with the reference voltage to generate a comparison signal in the form of a base logic state during the information loading period, and then the base logic state of the comparison signal at a time delayed by a certain amount based on the sweeping pulse during the conversion synchronization process. The frequency band of the received signal after determining whether Characterized in the receiving band constituted by any detection procedure for displaying the band. ※ Note: The disclosure is based on the initial application.