The method of preliminary detection of celestial objects’ signals is offered, which is based on comparing of values of spatial convolution of the accepted radiation, in the neighbour of digital image's peak, and by a mask, corresponding to the form of the expected signal, to the threshold. The new model of distribution of values of spatial convolution is offered, which is represented a mixture of normal distribution law and "tail", which is situated in area of large values of spatial convolution. An approximate selection of normal ("base-line") component of distribution of values of spatial convolution is followed the developed computational method for determination of rejection threshold of digital image's peaks, in the neighborhood of which celestial objects’ signals are absent. The method has used by authors in developed system of automatic new asteroids detection and known asteroids tracking.
signals are methods of exposure, digital representation, PZS-shot