Pulse generator

An improved generator for generating pulse groups during cycles of operation, each group comprising a predetermined number of pulses of predetermined pulse widths and predetermined spacings within the group, said pulses being suitable for use as synchronization and triggering pulses in a radar system, the pulse generation being carried out purely digitally by using digital circuit elements and dependent on a control frequency which is generated by an oscillator therein the improvement wherein said generator comprises controllable pulse generator means for generating the pulses of each pulse group, a first unit for determining the time space between the pulse groups and comprising a first storage means in which selectable time space numbers are programmed, a first addressing means for generating addresses for said first storage means, and a first sequential counting circuit coupled to said first storage means for receiving a presetting signal from said first storage means and outputting a time space pulse R.sub.2 for resetting said first sequential counting circuit to the preset number supplied thereto during each cycle of operation, said sequential counting circuit being clocked by a clock signal T derived from the control frequency;

• and a second unit for controlling the pulse generator means and comprising second storage means in which pulse edge position numbers for determining said pulse widths and for determining time positions of said pulses are programmed in selectable storage areas, a second addressing means for generating addresses for said second storage means, a second sequential counting circuit coupled to receive said time space pulse R.sub.2 from said first sequential counting circuit and clocked by said clock signal T, said second sequential counting circuit being reset to zero by the time space pulse R.sub.2 supplied by said first sequential circuit so as to be advanced thereafter, and comparing and addressing means coupled to said second storage means and said second sequential counting circuit for comparing continuously the output signal of said second sequential circuit and the actual pulse edge position number from said second storage means and for generating at a detected correspondence a control signal for that one of said pulse generator means for which the pulse edge position number is intended.