In order to solve the problem that ground-based optical telescope cannot detect space targets in the daytime, an infrared detection method is proposed in this paper. Firstly, from the perspective of spectral characteristics of space targets and skylight, the short-wave infrared band (SWIR) of 0.9~1.7μm is optimized, which reduces the brightness of the skylight, and avoids the cooling of the optical system. Secondly, the signal-to-noise ratio (SNR) of the target is improved by the time-domain multi-frame accumulation algorithm and the goal of daytime 'extended range' detection of optical telescope is achieved. Experiments on a 0.3-meter telescope show that the space targets, which SNR less than 1 are detected by adopting this method in the daytime, when the zenith angle of sun is 40°, exposure time is 40ms, and the number of the cumulative frames is 360, the limit detection ability is 10.8mV. The results of the experiments well verify the theoretical analysis, which provides a reference for the system design of the next generation of ground-based optical telescope.
KEYWORDS: Detection and tracking algorithms, Target detection, Infrared detectors, Infrared radiation, Signal to noise ratio, Signal detection, Infrared imaging, Telescopes, Signal processing, Infrared telescopes
The blind pixels and the flash pixels of infrared detector, which are easily to be detected as the target, increase the false alarm rate. An algorithm about the detection of blind pixel and flash pixel is proposed in this paper. This method is based on the characteristics that the gray values of the blind pixels in the sequence images are basically unchanged, there is a jump in the gray values of the flash pixels, and there are obvious differences between blind pixels and neighboring pixels in spatial domain, the method of joint processing in space-time domain is used to detect blind pixels. Compared with the traditional algorithm, this method effectively avoids the problem of target signal suppression in blind flash pixel detection. The experiment of a 0.3m telescope shows that this algorithm can effectively eliminate blind flash pixels in infrared images. In the experiment of dim target detection, combined with multi-frame energy accumulation algorithm, this algorithm has the ability to detect targets with signal to noise ratio (SNR) ≤ 1 and the brightness of 10.8mVisdetected, which lays a technical foundation for the follow-up ground-based optical telescope to carry out full-time detection.
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