An open loop proximity detector is contemplated which receives a Doppler frequency when a target is first detected, and predicts a specific fuzing Doppler frequency. The detector continues to transmit and receive electromagnetic waves and sends a detonating signal to the fuze when the predicted fuzing Doppler frequency is received by the detector. The Doppler frequency of the first, or front surface in a forward moving direction of the target is received and is used to detonate the fuze. Thus th...

A system for correcting phase errors in a space based radar system utilizing probes located in front of an array of lens elements of a phased array antenna. Included is a mechanism for supplying a stored perfect value signal indicative of the distance between the probes and lens elements for a perfect, nondeformed array, and the mechanism for receiving radiated pilot signals to supply an actual value signal indicative of the actual distance between the probes and the lens elements to determine a...

A laser radar system for detecting objects transmits a laser beam which is frequency modulated by the motion of scanning mirrors, which scan the beam across an object to be imaged. The return beam, reflected by the object, is combined with the local oscillator beam, and the frequency difference is detected. This frequency difference is obtained by the Doppler induced frequency modulation which results from the motion of the scanning mirrors. A signal corresponding to this frequency difference ma...

A single null miniature direction finder which may be worn on the arm of the user and is fully automatic in operation. Signals from a single loop antenna and a sense antenna are summed; however, the amplitude of the sense signal is adjusted at first and second phase angles and the phase of the sense antenna is automatically switched from the first phase angle to the second phase angle prior to summing to produce either a single null or a no null pattern. These patterns are compared to each other...

A system wherein TCAS transmissions have two jitter components added to the jitter component utilized in the interscan interval to minimize TCAS interference with ground station operation. The jitter components minimize the establishment of false intruder tracks caused by responses to ground station interrogations or interrogations by other TCAS interrogators which are received in synchronism with the TCAS interrogation signals.

A module disposed at each radiating element of a phased array antenna, the module having a limiter, a low-noise amplifier and a phase shifter. One embodiment includes a DPDT switch to permit use of a common phase shifter on transmit and receive. On transmit, the DPDT switch is thrown in a position that connects the phase shifter directly to the radiating element. On receive, the DPDT switch is thrown in a position that connects the radiating element through the limiter and low noise amplifier an...

A portable compact target motion simulation system, adapted to generate simulated target motion for displaying, tracking, and controlling a plurality of simulated targets on a display device for training purposes. The system is operable to generate pre-programmed and dynamic exercises, for training trainees in operating tracking devices, to develop trainee skill in analyzing and responding properly to target motion. The apparatus is totally programmable, and capable of providing targets in any m...

A programmable radar target simulator provides microwave signals for testing a missile that is otherwise controlled by such signals when it is deployed. The simulator has the capability for initiating suitable microwave signals at the proper power levels in the fully automatic, semi-automatic, or fully manual modes. A control section and an IF section accept digital commands from an external computer or manual control from switches and thumbwheels on the front panel of the simulator to provide f...

Range resolution in an FMCW radar system is achieved by providing a periodic linear frequency sweep. The present invention assures the linearity of this sweep by using a negative feedback circuit which includes means for obtaining 16 sequential instantaneous frequency versus time slope measurements during each sweep cycle, generating a set of 16 sequential error signals and a corresponding set of correction voltages, and applying these correction voltages to the sweep drive voltage used to drive...

The range (R) to a target (12) is precisely determined by controlling the amplitude of the carrier before modulation using a feedback signal derived from the detected return. The amplitude of the carrier is adjusted (40) so that all return pulses have a constant amplitude. Hence, for any given range, all return pulses cross threshold at the same time, thereby eliminating ranging errors due to phase distortion. The return pulses are threshold detected (54) and converted to a CW signal, which is t...