GB1109087A - Improvements in or relating to apparatus for radar video signal transmission - Google Patents

Abstract

1,109,087. Pulse radar. INTERNATIONAL STANDARD ELECTRIC CORPORATION. 23 July, 1965 [23 July, 1964], No. 31518/65. Heading H4D. In radar video signal transmission for bandwidth reduction the radar echo data in a pulse repetition period is divided into n equal time parts and when passing over an angular sector corresponding to a desired angular resolution only the echoes in one of the n parts is stored whereby over n succeeding angular sectors all the echo signals are written into the store and read-out therefrom for data transmission to the distant point is such that signals are transmitted during the aerial sweep over n angular sectors, the omitted echoes being transmitted during the n - 1 rotations of the radar aerial. In the embodiment n = 3. The radar transmitted pulse train WT is also applied to a divider T1 via a gate Tor controlled by a delayed pulse from a bi-stable FF. Range gating pulses from a divider T3 and trains from divider T1 are fed to AND circuits 1, 2, 3 the outputs from which, via OR circuit 4, are fed to writing pulse generator ST to control the insertion of the radar echo video signals into a line storage unit ZSP, read-out from which is controlled by an output from divider T1. A north-marking pulse is added. At the distant point writing into a storage device is at a frequency corresponding to data transfer speed and read-out is at three times that frequency and takes place only during a third of each reading period, Figs. 5, 6 (neither shown). Real time data transfer utilizing a wide-band channel is available when switches 5 . . . 8 are changed over.