A method and device for dynamic correction of signal drift

Abstract

The invention discloses a signal drift dynamic correction method and device. A direct-current recovery ring circuit is adopted for achieving dynamic correction of signal drift of photoelectric detector pre-circuit output, a signal amplification and conditioning circuit and the like, in the period of detecting a dark object, a switch S1 is closed, direct-current recovery is executed on a feedback loop, output is forced to reach a set low value, the switch S1 is disconnected to make direct-current recover a datum point A point level clamp, and a B point level is collected to serve as current background data; by switching to a scene target, an input scene target signal is overlaid on a direct-current level of the A point clamp, a B point level is collected to serve as the sum of scene targetdata and the background data, and scene target data can be obtained by subtracting the background data. The above-mentioned operations are repeated periodically, and the scene target data can be continuously obtained. Accordingly, the background signal level can be inhibited, the signal dynamic range can be widened, the system measurement precision is effectively improved, and the method and device are specially suitable for the technical field of space remote sensing.

Description

technical field [0001] The invention relates to the technical field of space remote sensing, in particular to a method and device for dynamic correction of signal drift. Background technique [0002] With the development of space remote sensing technology, the demand for detection accuracy of photoelectric loads such as radiometers is also increasing, but the complex space environment is one of the main factors restricting the performance of this type of remote sensor. In the outer space environment, due to the influence of temperature and space ray radiation, the parameter drift of the detector and electronic components in the remote sensor will cause the drift of the measurement background of the instrument, which will lead to the degradation of measurement accuracy and dynamic range. . In order to effectively suppress the background and its drift, the traditional method adopts the method of setting a subtraction circuit in the signal amplification and conditioning link, ...

AI Technical Summary

Problems solved by technology

Disadvantages of using this method: First, there are many factors that cause drift, and the ground cannot be determined and accurately simulated; second, setting more gears will increase the complexity of the system, and fewer gears can not achieve fine drift correction; third, the drift value Difficult to detect and determine, unable to accurately determine the file

At the same time, the setting factor is difficult to control, and it is impossible to accurately track the current drift value, which is prone to inconsistency with the actual drift, which in turn affects the improvement effect of measurement accuracy and dynamic range

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