Abstract: A pulse repetition interval generator with stagger circuit for providing a ulse repetition interval signal. The pulse repetition interval generator can be used with a device for generating simulated antenna scan patterns of conventional search radar antennas and comprises a source of clock pulses, a counter circuit, a repetition interval setting means, pulse generator means and a pulse width determining means.

Abstract: Apparatus for generating pulses having selectable pulse width and selecta pulse repetition interval which may be used as a pulse repetition interval generator in a radar signal simulator. Each pulse is initiated by a clocked counter when it reaches a predetermined count from a preselected initial count. The initial count is determined by data stored in a read-only-memory which is selectably loaded into the counter to provide a variable initial count. Another clocked counter which is enabled by the leading edge of the pulse then terminates the pulse when it reaches a predetermined count from a preselected initial count.

Abstract: A device for generating simulated antenna scan patterns of conventional sch radar antennas comprising an antenna scan generator for providing a low frequency a-c signal and a pulse repetition interval generator with stagger circuit for providing a pulse repetition interval signal. An RF carrier signal modulated by the pulse repetition interval signal is amplitude modulated by the low frequency a-c signal for generating the simulated antenna scan pattern.