Signal acquisition circuit applied to laser cloud measuring radar

Abstract

The invention discloses a signal acquisition circuit applied to a laser cloud measurement radar, and belongs to the technical field of signal acquisition circuits. A power conversion circuit is electrically connected with an APD receiving module, a transimpedance amplification circuit and a variable gain amplification circuit, the APD receiving module is electrically connected with a temperature monitoring circuit, and the temperature monitoring circuit is electrically connected with an IIC bus interface. The APD receiving module is electrically connected with the transimpedance amplification circuit, the transimpedance amplification circuit is electrically connected with the variable gain amplification circuit, the variable gain amplification circuit is electrically connected with an SPI bus interface and a signal output interface. APD working voltage information is stored in a data memory, the interchangeability between the modules is improved, and the stability of the working state is improved. Meanwhile, a multi-stage variable gain function is realized, so that the adaptability to different signal amplitudes is ensured.

Description

technical field [0001] The invention relates to a signal acquisition circuit, in particular to a signal acquisition circuit applied to a laser cloud measuring radar, and belongs to the technical field of signal acquisition circuits. Background technique [0002] The basic principle of the laser cloud radar system is to control the laser at the transmitting end of the cloud radar to emit a certain period of short pulse laser. When the laser reaches the bottom of the cloud, it will reflect back to the receiving end of the cloud radar. Perform post-processing to obtain information related to cloud base height and cloud layer. [0003] The signal information that can be obtained by the cloud radar mainly depends on the ability of the signal acquisition circuit to obtain analog signals. The higher the signal-to-noise ratio, the higher the sensitivity. The more it is, the better it is to analyze the meteorological information of the cloud layer. [0004] However, the signal acqu...

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Problems solved by technology

[0004] However, the signal acquisition circuit applied to laser cloud radar in the prior art has a narrow working environment temperature range, the gain cannot be dynamically adjusted, and the signal-to-noise ratio is low. Therefore, a signal acquisition circuit applied to laser cloud radar is designed to improve above question

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