OWN JAMMING EXCISION

THE OBJECTIVE OF THIS EXPLORATORY DEVELOPMENT IS TO PROVIDE A PROOF OF CONCEPT WITH ANALYSIS AND SIMULATION OF A TRANSMIT AND RECEIVER SYSTEM USING A COMMON ANTENNA THAT CAN BE USED FOR JAMMING WHILE SIMULTANEOUSLY TRACKING AND SEARCHING FOR THREATS. THE JAMMER MAY TRANSMIT MANY KILOWATTS WHICH INEVITABLY RESULTS IN CONSIDERABLE POWER LEAKAGE AT THE RECEIVER INPUT. WITH CURRENT JAMMING SYSTEM, THIS CAUSES RECEIVER SATURATION AND POTENTIAL DAMAGE TO THE LOW LEVEL AMPLIFIERS AND MIXERS OF THE RECEIVER. THE RECEIVER MUST THEREFORE BE MADE INOPERATIVE DURING PERIODS OF JAMMING. THE PROPOSED CONCEPT USES SPREAD SPECTRUM TECHNIQUES TO REDUCE THE JAMMER POWER SPECTRAL DENSITY AT THE RECEIVER INPUT. THE JAMMER LEAKAGE AT THE RECEIVER INPUT IS SPREAD IN FREQUENCY BY A PSEUDO NOISE (PN) CODE AND IS CORRELATED WITH A TRANSMITTER REFERENCE THAT IS SPREAD BY AN ORTHOGONAL PN CODE, RESULTING IN VERY LOW CROSS-CORRELATION LEVELS. THE THREAT SIGNAL IS ALSO SPREAD AT THE RECEIVER INPUT AND IS CORRELATED WITH A REPLICA WAVEFORM IN THE RECEIVER, THUS COLLAPSING ITS BANDWITH. CORRELATION OF THE SPREAD THREAT SIGNAL AND A REPLICA, WHEN INTEGRATEDOVER THE PN SEQUENCE TIME, PROVIDES AN AUTO-CORRELATION PEAK FOR THRESHOLD DETECTION.