Abstract: A high power tunable radio frequency circuit which may be used, for example, in a power oscillator, frequency discriminator, diplexer, filter, or a multicoupler comprising a stripline distributed circuit in the influence of a variable magnetic field introduced orthogonally to the plane of the stripline circuit. The stripline is laminated between two layers of planar ferrite members and the D.C. magnetic field intensity is varied to bias the material to a predetermined but variable permeability level, thus changing the propagation velocity of the R.F. signal in the stripline and, therefore, acting to tune the device. Alternately, a microstrip embodiment may be employed utilizing a planar ferrite substrate on one side of the circuit configuration only.

Abstract: An improvement in a pulsed radar system providing coherent-on-receive signals utilizing digital techniques. The phase of the transmitted signal is compared to the phase of a stable local oscillator and the phase relationship is converted to a complex digial number which is then stored in a suitable short term memory. The received signals are also converted to complex digital numbers containing both the phase relationship to the stable local oscillator and the amplitude of the return video signal. A common signal channel is used for conversion of both the transmitter pulse and the received signals. The digitized received signals are then digitally phase corrected to provide coherence using the stored complex digital numbers for the correction.

Abstract: A modulating and demodulating system for converting a plurality of baseband space division signals to a frequency division multiplexed signal. The baseband signals are sequentially sampled and converted in an analog-to-digital converter to a series of digital words. Predetermined mathematical algorithms incorporating digital filters, multipliers and shift registers are used to convert the series of digital words to a frequency division multiplexed digital signal. Aliasing of the baseband signals provides the required dispersion through a predetermined frequency range. A digital to analog converter coupled to a conventional balanced mixer and oscillator is then used to up convert the resulting signal to the desired frequency range. A high pass filter is used to remove the image frequencies. The resulting frequency division multiplexed signal may be transmitted by conventional means to a remote location where demodulation is accomplished essentially by reversal of the modulation process.

Abstract: A system for suspending underwater equipment at a predetermined depth below the surface; the system providing storage means for the equipment prior to deployment, protection for the equipment during deployment and stabilization of the equipment at a predetermined depth below the water surface after deployment. A subsystem of virtual masses and a vertically oriented "window shade" drogue is deployed to provide stabilization of the equipment in both vertical and horizontal directions after deployment. Portions of the deployment package are subsequently utilized as part of the stabilization subsystem.

Abstract: A system for differentiating between targets containing non-linear metal element junctions and their surrounding non-metallic environment. A spread spectrum illuminating transmitter is used in conjunction with correlation circuits in a receiver to enhance its signal to interference ratio and reduce required peak power level in the illuminator/transmitter.

Abstract: A remotely situated detonator is acoustically triggered to detonate explosives. Conduit means capable of propagating an acoustic wave is used to transmit a precoded acoustic wave signal from a transmitter to a receiver. The receiver is provided with means for converting the precoded acoustic wave signal to an electrical output signal to actuate the detonator and decoding means for discriminating against noise signals. For safety reasons, time delay means may be provided to delay generation of the acoustic wave signals until after a predetermined time period. The aforedescribed detonation system may be utilized to rejuvenate or activate subterranean petroleum, gas, geothermal steam, or water and the like.

Abstract: An arming system safety device for a multiple mounting bracket airborne weapon for preventing the arming of the weapon until complete disengagement of all mounting brackets has been achieved includes an arming lanyard retaining member slidably engaging the mounting brackets, the retaining member being held in a first position by the mounting brackets and the ejector hooks of an aircraft for retaining the arming lanyard in a safe position and moving to a release position when all brackets have been completely released.

Abstract: A digital system for measuring a phase relationship between two noisy signals of a given period wherein the phase difference measurement may lie in the range of from 0 to 360 degrees. The noisy signals are amplified and limited so that the processed signal only contains noise in the time vicinity around the zero crossing points. Time interval counters are utilized to measure the time delay between signals and the time period of the reference signal. Phase relationship may be determined by multiplying the ratio of the two digital numbers produced by 360.degree.. Errors in digital outputs are minimized by digitally integrating the counter input during the noisy zero crossover periods. The measurements are completed within two period times of the signals being measured and may be repeated in each of the succeeding two period times.

Abstract: A matched transmission line coupling an RF generator to an antenna and receiving Doppler altered reflected signals from the antenna. A pair of diodes coupled to the transmission line 90 electrical degrees apart at the RF frequency and oppositely poled so that the RF signal from the generator and the reflected signal from the antenna are heterodyned in each diode to produce a heterodyne signal which is in phase. The heterodyne signals are band limited, filtered and passed through threshold detectors separately to provide separate in phase pulses which are applied to a coincidence gate to provide an output. Amplitude modulation is rejected because it produces out of phase signals and frequency modulation is rejected because the transmission line is substantially flat. The RF generator may be frequency modulated and the output of the coincidence gate is applied to a shift register to insure the triggering thereof by only a true Doppler signal.