Intermediate-frequency cancellation technology

A technology, intermediate frequency technology, applied in the new field of leakage signal suppression, it can solve the problems of difficulty in realizing fast and accurate matching of leakage signals, complicated realization of elimination equipment, etc., and achieve the effect of high suppression ratio, reduced requirements and accurate measurement.

Inactive Publication Date: 2015-10-21
WUHU HANGFEI SCI & TECH
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Problems solved by technology

[0009] The above-mentioned CW radar leakage signal cancellation method has three disadvantages: a. The leakage signal cancellation is relatively low, up to about 50dB; b. The implementation of the cancellation equipment is relatively complicated; c.

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Embodiment Construction

[0033] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] like figure 1 Shown is the system block diagram of the continuous wave radar leakage signal cancellation system of the present invention. The leakage signal cancellation system of the present invention includes: transmitting antenna, receiving antenna, transmitter, receiver and controller, and the transmitting antenna radiates the signal of the transmitter , while the receiving antenna receives the echo signal and the direct wave signal leaked from the transmitting antenna. The transmitter is composed of a filter amplification module, an up-conversion module and a power amplifier; the receiver is composed of a low-noise amplifier, a down-conversion module, a filter amplification module and The quadrature demodulation module is composed; the controller includes an analog signal conditioning circuit and a digital signal processing...

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Abstract

The invention provides the intermediate-frequency cancellation technology. An intermediate-frequency cancellation system comprises a antenna device, an emitter, a receiver and a controller. The antenna device is formed by an emitting antenna and a receiving antenna. The emitter is formed by a filtering amplifying module, an upper frequency conversion module and a power amplifier. The receiver is formed by a low-noise amplifier, a lower frequency conversation module, a filtering amplifying module and an orthogonal demodulation module. The controller comprises an analog signal conditioning circuit and a digital signal processing unit circuit. By carrying out sampling for orthogonally demodulated signals and real-time self-adaption cancellation for the signals, leaked signals can be restrained and measurement precision of the system is increased. Meanwhile, the video cancellation system is characterized in that the video cancellation system is easy to make and manufacture.

Description

technical field [0001] The invention relates to an intermediate frequency cancellation technology, which is a video leakage signal cancellation technology for landing navigation continuous wave speed measuring radar, and is a new leakage signal suppression method. Background technique [0002] Microwave leakage cancellation technology is the main technology to solve the problem of isolation between the radar transmitter signal directly leaked to the receiver signal, that is, the transceiver isolation problem, and it is also necessary for almost all continuous wave radars with high requirements. The importance of microwave leakage cancellation technology lies not only in its ability to suppress microwave leakage signals, but also in its ability to ensure moderate dynamics of radar echo signals. [0003] The current leakage suppression technology to solve the isolation of continuous wave radar mainly includes radio frequency cancellation, intermediate frequency cancellation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 宋琪陈之典罗诗旭王宇航檀剑飞汪言康陈坤朱倩邓禹
Owner WUHU HANGFEI SCI & TECH
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