Abstract: A diode microwave switch is disclosed having both low power dissipation loss and a low voltage standing wave ratio by the techniques of mounting microwave diodes on pedestals and interconnecting them with air line microstrip connections and utilizing special impedance matching techniques. Voltage standing wave ratios of 1.15:1.00 with 0.3 db loss in a three diode 60 db isolation switch are readily obtained.

Abstract: LORAN-C navigation equipment is disclosed wherein digital circuitry is used to automatically distinguish a master LORAN-C transmitting station from a secondary station. The equipment operator manually enters approximate time difference of signal arrival information for a particular secondary station into the equipment after consulting a LORAN-C chart. The operator then manually determines the exact time difference of arrival using thumbwheel switches and a LED lamp display. This procedure is repeated to determine exact time difference of arrival information for the master and each selected secondary station, and the information is plotted in a well-known manner on the LORAN-C chart to locate the position of the craft upon which the equipment is located. Manual acquisition of secondary stations simplifies the equipment and eliminates interference problems caused by skywaves and other transmissions.

Abstract: A satellite relay communications system includes a ground relay station arranged so that each message from one subscriber to another is relayed by the satellite relay to the ground relay, processed by the ground relay and then transmitted to the second subscriber by way of the satellite relay. Processing at the ground relay station includes a switching function in which the carrier frequency of each message is changed from the frequency used for transmitting by the subscriber sending each message to the frequency used for reception by the subscriber to whom the message is addressed. This permits each subscriber to use a single transmitting frequency and a minimum number of receiving frequencies.

Abstract: LORAN-C navigation equipment is disclosed wherein digital circuitry is used to automatically distinguish a master LORAN-C transmitting station from a secondary station. The equipment operator manually enters approximate time difference of signal arrival information for a particular secondary station into the equipment after consulting a LORAN-C chart. The operator then manually determines the exact time difference of arrival using thumbwheel switches and a LED lamp display. This procedure is repeated to determine exact time difference of arrival information for the master and each selected secondary station, and the information is plotted in a well-known manner on the LORAN-C chart to locate the position of the craft upon which the equipment is located. Manual acqisition of secondary stations simplifies the equipment and eliminates interference problems caused by skywaves and other transmissions.

Abstract: Apparatus is disclosed which generates simulated radar target signal returns that are input to radar equipment to test the equipment and to train radar operators. A small number of individual simulated radar target signal scenarios are provided which are easily selectively combined to provide a large plurality of training scenarios on a radar display. The equipment provides such features as multiple aircraft display, terrain masking, variable target size, range gate splitting, identification friend or foe, and ambiguity checking. The radar signal generator apparatus utilizes a stored binary data word representing each simulated radar target trace and each data word contains bit fields for each of the above target features as well as the simulated target position on the radar display indicator. A single counter driven by the radar system clock is used to generate binary numbers that are compared to the target position information of each stored target data word.

Abstract: A universal antenna reflector providing a constant beam width pattern for any frequency of reflected electromagnetic energy illuminating the reflector is disclosed. The constant beam width reflected pattern is determined only by the characteristics of a particular antenna illuminating the reflector. The reflector is described by a family of curves the physical centers of each of which are coincident with and distributed along a unique backbone curve with each of the family of curves being perpendicular thereto.

Abstract: The disclosure describes a digitally controlled raster scan display system comprising a video signal generator that is automatically synchronized with the frequency of the a.c. power line from which it is powered to prevent line frequency beating. The display system also comprises a raster scan display generating a video display in response to signals from the video signal generator while needing no synchronizing circuits such as a phase lock loop.

Abstract: Alignment apparatus is disclosed for use in a radar display system in which targets are displayed on a raster scanned cathode ray tube and a computer causes target identities to be displayed adjacent to each target. To align the display system the computer generates a first signal which is applied to the system in the same manner as are radar video signals, and generate a second signal which is applied to the system in the same manner as are target identity signals. The two signals cause two dot test patterns to be displayed on the tube and interactive display techniques including a positional entry device such as a light pen are used to cause the two test patterns to be superposed. In response to superposition of each dots of the test patterns, the computer generates and stores correction signals which are thereafter used to modify the target identity signals to assure that target identities are displayed in proper registration with the targets.

Abstract: In a radar PPI display, digital techniques are utilized to allow an operator to move the point about which the radial trace beam rotates to a point remote from the center of the radar viewing screen and including movement off the screen without actually moving the display beam off the screen. A sweep signal generator detects the location of the operator positioned off-center point from the settings of off-center controls and is responsive to radar range scale and antenna position signals to generate appropriate ramp deflection signals in the proper time sequence to accurately display a selected portion of the plan position indication upon the entire area of the viewing screen. A beam control circuit is responsive to the same signals as the signal generator and to a radar start pulse to determine the exact time the PPI display beam is to be turned on to display selected portions of the plan position indication.

Abstract: A p-i-n diode microwave switch is disclosed capable of hot switching relatively high power microwave energy while maintaining high isolation between the input and outputs. To accomplish the high isolation at high power operating levels multiple p-i-n diodes are utilized with different forward and reverse bias potentials being applied to different diodes.

Abstract: A serial buss processor with detailed description of program branching and register addressing. A mask and branch instruction is utilized to effect a relative program branch of up to N + 1 address locations away from the address of the current or masking branch instruction, where N is the number of bits in the data operand. Register addressing is partly direct and partly indirect. The indirect register address scheme employs a directly addressable register, the contents of which are interpreted by an indirect address generator unit which itself is directly addressable such that a single value in the directly addressable register may be used to point to different registers.