Infrared Imaging Method Based on Digital Domain TDI

Abstract

The infrared imaging method based on digital domain TDI belongs to the field of infrared imaging technology. In order to solve the problem that the conventional infrared imaging method cannot realize flexible and continuous integration series selection and image acquisition of large target range, the target radiation signal is converged to the area array through the optical lens. On the infrared detector, the area array infrared detector converts the radiation signal of the target into an analog voltage signal, and the signal passes through the operational amplifier to complete impedance matching and proportional amplification, and outputs an analog signal that matches the input of the A / D converter. The signal is digitally quantized by the A / D converter, and then output to the FPGA circuit. The quantized image data is stored in the FPGA circuit in units of frames, and the multi-frame image data cache and TDI superposition algorithm are completed, and finally the processed image data is output. Image data; the invention effectively increases the exposure time, improves the sensitivity of the system, and can detect and reconnaissance weak radiation targets.

Description

technical field [0001] The invention belongs to the technical field of infrared imaging, and relates to an infrared imaging method using a digital domain to realize the function of time delay integration (TimeDelay Integration). Background technique [0002] The core of the infrared imaging system is the infrared detector, which determines the main performance indicators of the imaging system, so the design of the infrared imaging system is carried out around the infrared detector. Currently commonly used infrared detectors can be divided into TDI (Time Delay Integration) infrared detectors and area array infrared detectors according to their working methods. Therefore, conventional infrared imaging methods include TDI imaging methods and area array imaging methods. The former uses the pixel structure of the sensor to realize the transfer and exposure accumulation of each row of pixels, thereby increasing the exposure time to the target, obtaining sufficient signal energy, a...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the conventional infrared imaging method cannot realize flexible and continuous integral series selection and image acquisition of a large target range, the present invention proposes an infrared imaging method based on digital domain TDI, using the existing area array infrared detector, Realized the function of time-delay integration, effectively increased the exposure time, improved the sensitivity of the system, has the imaging capability of a large target range, can flexibly and continuously select the integration series, and can detect weak radiation targets

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