Linear frequency modulation continuous wave radar transceiving front end

Abstract

The invention discloses a linear frequency modulation continuous wave radar transceiving front end, and aims to provide a transceiving front end which is simple in structure, high in integration, small in size, and easy to realize integration in one step. According to the technical scheme, a transmitting antenna (4) and a receiving antenna (5) are integrated in the cylinder transmitting channel and the receiving channel of an upper cavity (1), wherein the transmitting channel and the receiving channel are symmetrical to the central axis, a radio frequency circuit (3) is installed in a disc cavity formed in the lower cavity cylinder, the radio frequency circuit (3) is used for carrying out the energy transmission with the transmitting antenna and the receiving antenna by means of electromagnetic coupling through the transmitting antenna and the receiving antenna, a waveform generator is used for inputting the generated modulation signal v (t) into a voltage-controlled oscillator in theradio frequency circuit 3, the voltage-controlled oscillator is used for modulating the modulation signal to a microwave frequency band, the generated frequency modulation signal is amplified throughmultiple times of frequency doubling and is used as a transmitting signal of the transmitting antenna to be transmitted out.

Description

Background technique [0001] With the continuous development of digital technology and signal processing technology, the FMCW radar using linear modulation has become the main target of current research and application. Millimeter-wave LFMCW radar combines the advantages of millimeter-wave radar and LFMCW radar, and is increasingly valued by countries all over the world. Compared with microwave radar, millimeter-wave LFMCW radar can achieve wider frequency modulation bandwidth and higher distance resolution, even with a smaller antenna, it can also produce high angular resolution; compared with traditional pulse radar , LFMCW radar requires lower transmit peak power. It adopts the continuous wave system to eliminate the distance blind zone, uses a large bandwidth to obtain high distance resolution and ranging accuracy, and the signal processing system of the radar is simpler. Therefore, the millimeter-wave LFMCW radar has the characteristics of small size, light weight, high ...

AI Technical Summary

Problems solved by technology

When the same antenna is used for sending and receiving signals, the leakage of the transmitter power will block the receiver, and the transmission power should not be too large, which makes the measurement distance shorter and it is difficult to measure multiple targets at the same time. If you want to measure multiple targets at the same time , it is necessary to use a large number of filters, making the device too complicated and inconvenient to use

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