A Logarithmic Quantization Compression Method for the Output Analog Signal of Large Dynamic Range Infrared Detector

Abstract

The invention discloses a logarithmic quantization compression system of an analog signal output by a large dynamic range infrared detector. The system is characterized by comprising a logarithmic amplifier and an analog-to-digital converter which are mutually connected, wherein the logarithmic amplifier is connected with a detector. When the maximum signal voltage output by the detector is ViM, the minimum signal voltage Vim output by the detector is 0.01ViM. The logarithmic quantization compression system of the analog signal output by the large dynamic range infrared detector meets large dynamic range remote sensing requirements and can meet required signal to noise ratio requirements.

Description

technical field [0001] The invention relates to a logarithmic quantization compression method, in particular to a logarithmic quantization compression method for outputting analog signals of a large dynamic range infrared detector. Background technique [0002] Remote sensing spacecraft work in orbit, subject to the constraints of the detector level, analog-to-digital converter level, and data capabilities of the remote sensing payload itself, the dynamic range of the detected targets is within a certain range. [0003] With the rapid development of my country's aerospace technology, a large number of new mission-oriented spacecraft have emerged, such as large elliptical orbit spacecraft for detecting infrared point targets. Due to the dramatic change in the distance of the observed target, the spacecraft has the problem of increasing the dynamic range of the target signal strength. [0004] At present, domestic high-resolution remote sensing satellites are limited by data ...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic high-resolution remote sensing satellites are limited by data transmission capabilities and cannot meet the needs of real-time transmission. Therefore, the logarithmic detection method of large dynamic range signal strength can well meet this demand

Due to the characteristics of the point target itself and the large change in the target distance, it is easy to cause the dynamic range of the output analog signal of the infrared point target detector to be too large, resulting in the difficulty of realizing the analog-to-digital conversion or the problem that the on-board digital transmission subsystem cannot transmit the remote sensing data in a timely and effective manner.

Images