Strobe generator

Claim 2

A strobe pulse generator for a pulse radar set, said radar set having a rotating directional antenna and a sweep interval defined by the time between transmitted pulses, said strobe pulse generator comprising; means to prevent spurious pickup from the side-lobes of said directional antenna, a clutter gate, means to feed the output of said antenna to the input of said clutter gate, means to open said clutter gate during the last 25% of each sweep interval of said radar set, a storage device connected to the output of said clutter gate, a first monostable multivibrator, means to trigger said first monostable multivibrator only in response to increasing charge on said storage device, a second monostable multivibrator, the output of said first multivibrator being arranged to maintain said second multivibrator in the set or unstable state, means responsive to the resetting of said second multivibrator to generate a pulse, an AND gate, means to feed said last-named pulse to one input of said AND gate and means to feed a gating pulse to the other input of said AND gate during the last 25% of each sweep interval.

Claim 3

A strobe pulse generator for a pulse radar set, said radar set comprising a rotating directional antenna, an omnidirectional antenna, a plan position indicator and having an interpulse period defined by the time between transmitted pulses, said strobe pulse generator comprising, a differential amplifier, means to feed the output of said rotating directional antenna and the output of said omnidirectional antenna to said differential amplifier, the gain of said last-named antenna being slightly greater than the side-lobe gain of said first-named antenna, a clutter gate, said clutter gate connected to the output of said differential amplifier, a gating multivibrator, said gating multivibrator connected to said clutter gate and arranged to open said gate during the final 25% of each interpulse period of said radar set, a storage device connected to the output of said clutter gate, a first differentiator connected to the output of said storage device, a first monostable multivibrator connected to the output of said first differentiator, said first multivibrator being triggered only by pulses indicative of increasing charge on said storage device, a second monostable multivibrator connected to the output of said first multivibrator, said second multivibrator having a pulse length longer than the radar set interpulse period, a second differentiator connected to the output of said second multivibrator, a pulse stretcher connected to the output of said second differentiator, an inverter connected to the output of said pulse stretcher, an AND gate, the output of said inverter being connected to one input of said AND gate, the other input of said AND gate being connected to the output of said gating multivibrator, the output of said AND gate being applied to said plan position indicator to produce a radial strobe line thereon.

Claim 4

A strobe pulse generator for a pulse radar set, said radar set comprising a rotating directional antenna, an omnidirectional antenna, a plan position indicator and having an interpulse period defined by the time between transmitted pulses, said strobe pulse generator comprising, a differential amplifier, means to feed the output of said rotating directional antenna and the output of said omnidirectional antenna to said differential amplifier, the gain of said last-named antenna being slightly greater than the side-lobe gain of said first-named antenna, a clutter gate, said clutter gate connected to the output of said differential amplifier, a gating multivibrator, said gating multivibrator connected to said clutter gate and arranged to open said gate during the final 25% of each interpulse period of said radar set, a storage device connected to the output of said clutter gate, a first differentiator connected to the output of said storage device, a first monostable multivibrator connected to the output of said first differentiator, said first multivibrator being triggered only by pulses indicative of increasing charge on said storage device, a second monostable multivibrator connected to the output of said first multivibrator, said second multivibrator having a pulse length longer than the radar set interpulse period, a second differentiator connected to the output of said second multivibrator, a pulse stretcher connected to the output of said second differentiator, an inverter connected to the output of said pulse stretcher, an AND gate, the output of said inverter being connected to one input of said AND gate, the other input of said AND gate being connected to the output of said gating multivibrator, the output of said AND gate being applied to said plan position indicator to produce a radial strobe line thereon.

Claim 5

A strobe generator for a radar set which includes a rotatable directional antenna, comprising; means to sweep said rotatable directional antenna past a source of enemy jamming signals, means to produce pulses of one polarity in response to increasing jamming signal strength on said antenna and pulses of the opposite polarity in response to decreasing jamming signal strength on said antenna, a monostable multivibrator, said pulses being applied to said monostable multivibrator being triggered only by said pulses of said one polarity, and means responsive to the cessation of pulse output from said monostable multivibrator to initiate a strobe pulse.

Claim 6

A strobe generator for a radar set which includes a rotatable directional antenna, comprising; means to sweep said rotatable directional antenna past a source of enemy jamming signals, means to produce pulses of one polarity in response to increasing jamming signal strength on said antenna and pulses of the opposite polarity in response to decreasing jamming signal strength on said antenna, a monostable multivibrator, said pulses being applied to said monostable multivibrator being triggered only by said pulses of said one polarity, and means responsive to the cessation of pulse output from said monostable multivibrator to initiate a strobe pulse.

Claim 7

A strobe generator for a radar set which includes a rotatable directional antenna, a plan position indicator and has an interpulse period defined by the time between transmitted pulses, comprising; means to sweep said rotatable directional antenna past a source of enemy jamming signals, means to produce pulses of one polarity in response to increasing jamming signal strength on said antenna and pulses of the opposite polarity in response to decreasing jamming signal strength thereon, a first monostable multivibrator, said pulses being applied to said first monostable multivibrator, said first multivibrator being triggered only by said pulses of said one polarity, the output of said first multivibrator being applied to a second monostable multivibrator with a pulse length longer than the interpulse period of said radar set and means responsive to the resetting of said second multivibrator for initiating a strobe pulse for application to said plan position indicator of said radar set.

Claim 8

A strobe generator for a radar set which includes a rotatable directional antenna, a plan position indicator and has an interpulse period defined by the time between transmitted pulses, comprising; means to sweep said rotatable directional antenna past a source of enemy jamming signals, means to produce pulses of one polarity in response to increasing jamming signal strength on said antenna and pulses of the opposite polarity in response to decreasing jamming signal strength thereon, a first monostable multivibrator, said pulses being applied to said first monostable multivibrator, said first multivibrator being triggered only by said pulses of said one polarity, the output of said first multivibrator being applied to a second monostable multivibrator with a pulse length longer than the interpulse period of said radar set and means responsive to the resetting of said second multivibrator for initiating a strobe pulse for application to said plan position indicator of said radar set.