VIDEO DISPLAY CIRCUIT FOR RADAR INDICATOR

摘要

PURPOSE:To display a radar video entirely regardless of the setting range of an indicator by constituting an A/D converter and a double buffer memory independently for a radar having a different transmission ratio and performing the read/write operation depending on the individual characteristics. CONSTITUTION:A read-out system controller 17 reads out a data corresponding to a required size of memory from short and long period memories according to the setting range of an indicator. An adder 33 adds the data read out from double butters of two systems and the sum data is fed to a D/A converter 14 which produces an analog CRT luminance modulation signal. On the other hand, a sweep data is produced from antenna angle information delayed through registers 20a-20c and a selector 31 for every trigger of transmission rate (n) and a sweep deflection signal is generated from a sweep generator 22. An input video obtained from two types of radar based on the luminance modulation signal and the deflection signal can be displayed without disabling for the purpose of prevention of secondary echo display.