Based on lfmcw ranging system

Abstract

The invention relates to the field of distance measurement, and discloses a distance measurement system based on LFMCW. The system includes: a signal generation module, a low-pass filter module, a power distribution module, a power amplification module, an antenna module, a signal amplification module, a frequency mixing module, and an intermediate frequency filter modules and signal conversion modules. In this system, the traditional indispensable low-noise amplification module is removed, and the useful signal is not submerged; due to the removal of the low-noise module, the information degree of the signal is improved, and the energy consumption of the entire system is reduced.

Description

technical field [0001] The invention relates to the field of distance measurement, in particular to a distance measurement system based on LFMCW. Background technique [0002] In the prior art, ranging applications are very mature, including short-distance ranging and long-distance ranging, for example: long-distance radar ranging, short-distance millimeter wave, infrared and laser ranging. In the existing short-distance ranging, many use pulse waves for distance measurement. Because the energy of the pulse wave itself is small, the reflected pulse signal is weak, which makes the distance measurement of pulse waves have the problem of low accuracy. The energy contained in the chirp continuous wave is relatively high, so many of them now use the chirp continuous wave for distance measurement. However, when the chirp continuous wave is used for distance measurement, there are problems of low isolation and poor anti-interference performance when the antenna transmits and receiv...

AI Technical Summary

Problems solved by technology

In the existing short-distance ranging, many use pulse waves for distance measurement. Because the energy of the pulse wave itself is small, the reflected pulse signal is weak, which makes the pulse wave distance measurement have a problem of low accuracy.

The energy contained in the chirp continuous wave is relatively high, so many of them now use the chirp continuous wave for distance measurement. However, when the chirp continuous wave is used for distance measurement, there are problems of low isolation and poor anti-interference performance when the antenna transmits and receives.

Moreover, in the existing ranging systems, there are low-noise amplification modules or low-noise amplifiers. The main reason for this is that the return signals received by the existing ranging systems contain interference or noise signals. If no low-noise amplification processing is performed, The desired useful signal will be overwhelmed and the useful signal will be lost

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