FIELD: passive optical location of remote object against background of stars. SUBSTANCE: process is based on reading of image of object and stars recorded in focal plane of telescope 1 by first scanning aperture in image recording unit 2, on processing of obtained videosignal , on subsequent isolation of object, on amplitude selection of videosignal in gating unit 3 in voltage interval between two reference levels
and
, on binary quantization in threshold processing unit 4, on digitization of selected videosignal in summing unit 5, on logic summing of N frames of selected videosignal and on isolating of object. Additional amplitude selection of videosignal with upper reference level
is carried out, summary videosignal is converted to luminous flux Φh of summary image in converter 6, spatial frequency filtration of luminous flux in direction α = αst± 90° is conducted, filtered luminous flux is read in filtration unit 7, videosignal
is obtained by second scanning aperture in unit of backward conversion. Two-level quantization with threshold Vb and discretization of obtained videosignal in dialysis unit 9 are performed. Coordinates of readings of non-zero digitized videosignal
are found by line and frame, minimal τ
is formed by results of analysis, fragments of videosignal Vs in time interval corresponding to gate Vs are extracted. Minimal Vmin and maximal Vmax levels of videosignal of isolated fragment are recorded, reference levels
and
of signal are formed in compliance with Vmin and Vmax, angle α is found as
. Object is isolated by excess of value Vb by results of analysis of values αbck and αst. Direction αst coincides with that of images of stars in focal plane of telescope. EFFECT: increased noise immunity of process. 4 dwg
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Authors
Dates
1998-03-27—Published
1986-03-07—Filed