Novel dark and weak target detection device under strong sky light background

Abstract

The invention relates to a novel dark and weak target detection device under a strong sky light background, and belongs to the technical field of optical searching and tracking equipment and star sensors. According to the device, interference of target light is realized by utilizing a shearing interferometer to form shearing interference fringes, periodic back-and-forth movement of the shearing interference fringes is realized by utilizing the shearing interferometer, frequency modulation of a target light signal is realized, then the light signals of the two transverse shearing beams are converted into electric signals through a detector, and finally the modulated target signal is detected through weak signal detection equipment and the influence of main noise including the sky backgroundis suppressed and detection of the dark and weak target signal is achieved. According to the novel dark and weak target detection device under the strong sky background, the problem that a short-distance target is difficult to interfere can be solved, the energy utilization rate can be greatly improved and the dark and weak target detection star magnitude and the sky light background inhibition capability can be improved.

Description

technical field [0001] The invention relates to the technical field of optical search and tracking equipment and star sensors, in particular to a novel dim target detection device under strong skylight background. Background technique [0002] Optical search and tracking technology is a widely used general-purpose technology, which can be used for precise pointing of laser beams, position and attitude maintenance of flying platforms, and high-precision tracking and aiming of large-aperture photoelectric telescopes. A star tracking device, usually called a star sensor, obtains the position and attitude information of an aircraft (satellite, etc.) by detecting the star field distribution in a large area. [0003] The existing optical search and track devices are affected by the sun and skylight background, and their detection period, detection capability and measurement accuracy are severely restricted. However, the existing methods for suppressing skylight background noise (...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a new type of faint target detection device under strong skylight background for the problems of low faint target detection magnitude and poor adaptability to the application environment in the existing faint target detectors.

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