Abstract: A signal processing circuit is disclosed for providing fuze-on-jam capability in a target detecting device, while in the presence of continuous wave or continuous wave noise jammer signals. A target detection system will protect the target detecting device from noise jammers and continuous wave radars or continuous wave jammers by providing a circuit which samples the negative or positive bias produced by the noise modulated CW signal and produces either positive or negative polarity as seen by the antenna. If negative pulses are produced, they will actuate the target detecting gate and guard circuit and after the missile has passed the critical angle of the antenna the phase change will then produce firing in the normal manner. The sampled output is fed into the target detecting mixing circuit and no interference with normal operations of the target detecting device occurs while a fuze-on-jam or CW capability is provided.

Abstract: A signal processing circuit for producing a warhead firing pulse when the rhead is in a position to cause maximum target damage in a missile, target encounter. The received doppler signal is processed through filter circuits and a first band-pass amplifier. A second band-pass amplifier tuned to pass a narrow portion of the frequency spectrum above the doppler signal is connected in parallel with the first amplifier and its output signal is used to vary the threshold bias to compensate for the presence of extremely noisy signals.

Abstract: A passive target detecting system for discriminating against both doppler d continuous wave off-target radars. A signal from the missile guidance system representing the pulse repetition frequency of the target being tracked is combined in a coincidence circuit with the signals received by the target detecting device. Doppler signals are compared directly while CW signals are processed through a chopper amplifier circuit to simulate doppler signals before comparison.

Abstract: A passive target detecting system for discriminating against off-target rrs. A signal from the missile guidance representing the pulse repetition frequency of the target being tracked is combined in a coincidence circuit with the signals received by the target detecting device.

Abstract: 1. In a microwave proximity fuze that can be activated within a few millionds prior to intercept of a target, the combination comprising:(a) a semiconductor frequency modulated microwave generator including a transistor power amplifier,(b) a power supply for supplying B+ voltage to said power amplifier,(c) a silicon controlled rectifier switch connected in series between said power supply and said power amplifier and having its control electrode connected to a terminal adapted to be connected to a control arming signal source,(d) bias circuit means connected to said rectifier switch for maintaining a bias voltage sufficient to keep said switch in a non-conducting condition until an arming signal with sufficient voltage to overcome said bias voltage is applied to said switch.

Abstract: A system for testing the performance and vulnerability of proximity fuzes der simulated live hardware conditions. The performance of the system is evaluated by the application of a repeater jammer signal within the cutoff range of the proximity fuze which is mounted in a free space test site. Beyond the cutoff range, the vulnerability of the proximity fuze is tested by the application of an unlimited number of modulated interference jamming signals which simulate approach and intercept of interference jamming sources.

Abstract: A two channel optical fuzing system for determining that a true target is esent by initiating a gating pulse when the forward looking channel first detects what appears to be a target and initiating an arming signal when the rearward looking channel sees the same target. If the arming signal initiated during the time interval of the gate pulse, a decision circuit passes an output pulse to the firing circuit which produces a firing pulse to initiate the warhead.

Abstract: A fuzing system in which a third or obscuration channel having a forward king narrow beam width detects a target and generates a signal which is fed to a sequence computer. If within a predetermined time after receipt of the third channel pulse, a second pulse is received from either of the two regular infrared channels, a pulse is generated to actuate the firing circuit. If the above time sequence of pulses is not present, the fuze system then functions in the normal two channel mode of operation.