Linear frequency modulation continuous wave radar transmit-receive isolation intermediate frequency circuit

Abstract

;The invention discloses a linear frequency modulation continuous wave radar transmit-receive isolation intermediate frequency circuit comprising an isolation circuit, a low-pass filter circuit, an intermediate frequency amplification circuit, an automatic gain control circuit and a power supply circuit; a transceiving isolation circuit, a low-pass filter circuit, an intermediate-frequency amplification circuit and an automatic gain control circuit in the intermediate-frequency circuit are connected in sequence through microstrip lines. The linear frequency modulation continuous wave radar transmit-receive isolation intermediate frequency circuit is small in size, low in power consumption, simple in design, convenient to apply and capable of effectively improving the overall transmit-receive isolation degree of a radar.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a linear frequency modulation continuous wave radar transceiver isolation intermediate frequency circuit. Background technique [0002] Due to the advantages of low transmission power, low probability of interception, low power consumption, and low circuit complexity, continuous wave radar is used more and more in systems such as miniaturized seekers, radars, fuzes, and electronic warfare jammers. There are many modulation methods for continuous wave radar, among which linear frequency modulation continuous wave radar is the most widely used. [0003] However, chirp continuous wave radar has its own inherent problem: transceiver isolation problem. The leakage of the transmitted signal to the receiving end will reduce the dynamic range of the receiver, deteriorate the sensitivity of the receiver, and in severe cases will drown out the smaller echo signals. Therefore,...

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Problems solved by technology

[0007] The present invention aims to provide a linear frequency modulation continuous wave radar transceiver isolation intermediate frequency circuit to solve the problems of complex intermediate frequency isolation circuit, poor isolation improvement effect and bulky overall intermediate frequency circuit when the intermediate frequency improves the isolation degree in the existing method

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