Abstract: An antenna which conforms to the surface of a non-metallic helmet for man-the-move communications. A metallic electronics housing mounted on the helmet and judiciously arranged antenna fingers comprise the radiating structure which is operable over a wide band of frequencies without tuning.

Abstract: Apparatus for receiving the horizontal and vertical electric field compons of incoming VLF, LF, and MF (10 KHz to 3000 kHz) signals that is easily portable and installed within minutes aboard aircraft with windows. A sheet of metal or matrix of interconnecting wires is placed against the inside surface of non-conducting windows on each side of the aircraft fuselage and used as the receiving antennas. The voltage sum of the two window antennas is proportional to the vertical electric field. The voltage difference of the two window antennas is proportional to the horizontal electric field particularly when the antennas are forward or to the rear of the wings extending from the fuselage.

Abstract: A waveguide to microstrip transition apparatus in which a waveguide coupled o a microstrip circuit is provided with a mode filter for suppressing spurious modes of electromagnetic signal propagation. The mode filter is attached to the end of the waveguide that is coupled to the microstrip circuit and the mode filter extends over a portion of the microstrip circuit.

Abstract: A network for sensing video noise power over a wide dynamic range and outting a voltage proportional to that noise power. The input signal is filtered, inverted and rectified to separate the noise component from the signal. The noise component is then converted to a negative level voltage which is added to first and second preset voltages. A non-linear output voltage which is a function of the first signal sum is provided for driving the voltage threshold devices in external equipment. A linear voltage output which is a function of the second signal sum is also provided for driving the voltage threshold devices of external equipment.

Abstract: A modularized digital controller which serves as a means of achieving dync compensation and also acts as an interfacing device in a closed-loop digital servo-control configuration. The controller incorporates four functional modules, the first of which is designed for the particular type of system being controlled and the remaining three being identical for all systems. A nonlinear or course control mode is employed during the period of synchronization to large input commands from a master source and, after the system dynamic error has been reduced to a nominal size, a linear control algorithm is used.

Abstract: A microstrip instantaneous frequency discriminator operable at frequencies bove 18GHz. A first power divider divides the input signal into equal power outputs which are used as the inputs to second and third power dividers. One of the outputs from each of the second and third power dividers is used as the input to a 180.degree. hybrid and the other output from each of the second and third power dividers is used as the inputs to a 90.degree. hybrid. The outputs of the 90.degree. hybrid and the 180.degree. hybrid are subsequently processed to provide signals suitable for a visual polar display of the instantaneous frequency and power level of the input signal.

Abstract: A balanced microcircuit mixer for down converting microwave and millimeter ave frequencies. A pair of beam lead diodes and an IF filter are mounted on a reverse-phased hybrid ring coupler providing a wide bandwidth mixer.

Abstract: A signal processing sensor which utilizes a combination of charge transfer devices and signal processing concepts which simultaneously measures the incident optical signal and performs a linear transformation upon that signal. Two CCD registers are arranged on either side of a photodiode array. Independent control of the transfer gates which control the flow of information stored in the depletion region of the photodiodes results in independent functioning of the two CCD registers. The difference between the charge in the two registers is taken at the output in order to provide both positive and negative weight for the data pattern that is to be convolved or correlated.

Abstract: Digital data having a rate R and to be transmitted is converted into a K- code, T-seconds long and delayed according to a particular N-bit word, where N=RT, whereby the code carries information in its delayed position in the T frame and not in the code itself. At a receiver station, the correlation function of the received signal is produced and the envelope detected, after which the samples are taken at each of the K possible output times. The largest output selected comprises the information on the delay of the transmitted signal.