TDI (Time Delay Integration) scan imaging method for Snapshot type area array infrared detector

Abstract

The invention discloses a TDI (Time Delay Integration) scan imaging method for a Snapshot type area array infrared detector. An optical mechanical scanning mechanism is arranged in front of an area array type infrared focal plane array, and the movement of an image is controlled by optical mechanical scanning. The shifted image obtained by the infrared focal plane array is input to a data accumulation processing circuit, and the image shifting accumulation processing is carried out to obtain the required image. The data accumulation processing circuit is mainly composed of a sampling circuit and a digital processing circuit. An AD (Analog-to-Digital) device is controlled by an FPGA (Field Programmable Gate Array) to perform sampling to finish the analog-to-digital conversion. After the analog-to-digital conversion is finished, a digital image signal is input to the digital processing circuit, the digital processing circuit performs image shifting accumulation, and finally the required image is output. The TDI scan imaging method for the Snapshot type area array infrared detector eliminates the trailing phenomenon caused due to the rotation of the detector when the area array detector is used in a search system, increases the signal-to-noise ratio of the image and is favorable for timely discovering a small dim target in a target searching and tracking system.

Description

technical field [0001] The invention belongs to the image enhancement technology in an infrared search system, in particular to a TDI scanning imaging method of a Snapshot type area array infrared detector. Background technique [0002] Infrared search and track (IRST) systems rely on receiving infrared radiation from targets to automatically search, detect, acquire and track potential targets. The first-generation IRST system mainly uses a multi-element detector with a preamplifier circuit to complete the search through optical-mechanical scanning. Due to the lack of stability, it leads to an unacceptable false alarm rate and a limited detection distance. The second-generation IRST system generally uses focal plane detectors, which can identify targets from clutter under a certain false alarm rate, and the detection distance is also greatly improved. [0003] At present, infrared search and track (IRST) systems generally use infrared focal plane sensors. Linear array FPA e...

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Problems solved by technology

[0003] At present, infrared search and track (IRST) systems generally use infrared focal plane sensors. Linear array FPA enables the system to achieve higher sensitivity and resolution. However, due to the inherent limitations of linear array FPA scanning systems, IRST systems cannot realize potential targets in any orientation. Tracking, and the IRST system using the area array FPA can better solve these problems, but the scanning motion of the detector within the frame integration time will cause serious smearing in the image, causing the point target to be blurred into a line target in the scanning direction for target detection had an impact

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