Passive imaging system with distance measuring function and distance measuring method thereof

Abstract

The invention discloses a passive imaging system with a distance measuring function and a distance measuring method of the passive imaging system. The passive imaging system comprises a high-frequency low-energy pulse laser emitting device, a photodiode array detector imaging device, a video amplifying and analog-digital converting device and a digital processing device for digital image processing and timing sequence occurrence. The high-frequency low-energy pulse laser emitting device is used for emitting high-frequency low-energy laser pulses and expanding bundles and shaping to reach a long distance; the photodiode array detector imaging device is used for receiving laser spots and background images reflected by a target and obtaining a distance value by adjusting integral time; the video amplifying and analog-digital converting device is used for converting photogenerated charges of the photodiode array detector imaging device into voltage and digitizing analog images through a analog-digital converter; the digital processing device for digital image processing and timing sequence occurrence is used for preprocessing digital images input by the video amplifying and analog-digital converting device and extracting the target. According to the passive imaging system, high-performance passive imaging and the distance measuring function are combined.

Description

technical field [0001] The invention belongs to the technical field of laser imaging and ranging, in particular to a passive imaging system with a ranging function and a ranging method thereof. Background technique [0002] The integration capacitor and transistor resources used for ranging can realize a very short integration time window (10ns-10μs), and realize the gating function to integrate the received signal. [0003] The laser rangefinders currently on the market are all non-imaging rangefinders, which use a laser beam with a small divergence angle to irradiate the target to form a laser measurement point, and use a point detector to receive the reflected or scattered laser signal from the measurement point. Inversion obtains the target distance. Because the size of the laser spot formed when the laser is irradiated on the target is very small, it leads to the difficulty of homing, that is, it is difficult for the laser beam to aim at the target when measuring the d...

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Problems solved by technology

[0015] In view of this, the main purpose of the present invention is to provide a passive imaging system with ranging function and its ranging method, so as to well solve the problem of ranging and passive imaging of existing laser imaging subsystems and laser ranging subsystems. Imaging two aspects of the problem

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