Electronic counter-counter-measure device

In combination with a tracking radar, from which are available signals including video and range gate, and having first amplifier means and subsequent error detector means, electronic counter-counter-measure means comprising:

• first protection and interface means connected to receive said video and comprising a first coupling capacitor as an input connection to a first voltage divider means including a potentiometer, and diode means connected across the output of said first voltage divider means;
• second protection and interface means connected to receive said range gate and comprising a second coupling capacitor as an input connection to a second voltage divider means including a plurality of series connected resistors, and diode means connected across the output of said second voltage divider means;
• a first time delay and inverter amplifier connected to receive the output of said first voltage divider means;
• a second time delay and inverter amplifier connected to receive the output of said second voltage divider means;
• first NAND gate means connected to receive the outputs of said first and second delay and inverter amplifiers and to provide an output condition representative of coincidence of a predetermined level of said video and presence of said range gate;
• interval timing means responsive to said output condition of said first NAND gate means to initiate an output condition for a predetermined time period, said interval timing means comprising second, third, and fourth NAND gate means, said second and third NAND gate means being coupled by an RC network and a feedback path to function as a monostable multivibrator for determining said predetermined time period, said fourth NAND gate being operative to invert the output of said third NAND gate means;
• a transistor amplifier means coupled to the output of said fourth NAND gate means and responsive thereto to generate as an output a video blanking pulse having a time duration equal to said predetermined time period starting at a point in time after occurrence of said predetermined level of said video, said point in time being determined at least in part by adjustment of said potentiometer and in part by time delays in said time delay and inverter amplifiers, in said NAND gate means, and in said transistor amplifier means;
• and
• means coupling said blanking pulse output to said first amplifier means whereby said video is blanked for a period equal in duration to said predetermined time period and starting substantially at said point in time after occurrence of said predetermined level of said video.