Abstract: A test computer has a direct memory access module, interface units, and a data select unit for each of several system busses. Only some of the data on each system buss is to be transferred to the direct memory access module. The data is organized with a command or header word which may be followed by a number of data words. The principle is to first check the command word to see if any data items are desired from the particular transfer, and if they are to check the position of each data item to see if it is desired. The data select unit includes a select memory, a position counter, and a position memory. During a load mode information from the test computer is loaded into the memories and counter to designate what data is to be transferred from the system buss.

Abstract: The system makes use of an interferometric Bragg cell for the time delays needed by the multiple antenna inputs in an angle-of-arrival (AOA) measurement system, for accurate measurements over wide bandwidths. A signal Bragg cell is modulated with a selected band of the EW signal environment, using a separate transducer coupled to each quadrant antenna element. A reference Bragg cell is modulated with a chirp signal. Coherent light from a laser is split and directed to both the signal cell and the reference cell. The output light beams from the reference Bragg cell and signal Bragg cell are combined and focused onto photo detectors having a one-dimensional array for each quadrant antenna element. The reference and signals are heterodyned at the photo detectors, which results in a channelized spectral output with each channel at the same intermediate frequency (IF).

Abstract: A television video data instrumentation recording system is coupled to a Bus Monitor/Video Encoder to incorporate a digital data recording capability within the normal video signal recording process while allowing for later digital data recovery during video playback. The digital data is acquired from a device addressable serial data bus which is normally an asynchronously polled system for exchanging data messages between a bus master device and multiple slave devices where each slave device has a unique device identification code for its messages. Data acquisition is a passive function (relative to the data bus) involving the hardward programmable selection of messages of interest (based on the message device code) and the software programmable deletion of messages that contain no data of interest. Another feature of data acquisition is that a time reference for time-of-acquisition is appended to the acquired messages of interest.

Abstract: The receiver comprises a 90.degree. hybrid and analog-to-digital converters etween the RF section and digital processing; which makes it possible to eliminate a phase correlator, four diode detectors and two differential amplifiers used in previous IFM receivers to obtain the sine and cosine signal samples at an initial time and at a delayed time.

Abstract: This is a method for control, fault detection, fault isolation, and state-of-health monitoring of batteries and battery arrays. The method consists of measuring all of the battery, cell, or cell group voltages, using statistics to determine a means voltage and a standard deviation voltage, then comparing all of the measured voltages to the mean voltage. If the measured voltage deviates from the mean voltage by an arbitrary amount (number of standard deviations) corrective action can be implemented or an alarm signal given. The measurements need to be made rapidly enough to eliminate battery or cell voltage changes due to state of charge or temperature changes and, in most cases, require a computerized data collection/reduction system. Absolute high and/or low voltage limits can be included to prevent catastrophic events. The concept can be expanded to include similar temperature, pressure and/or battery current measurements in an array.

Abstract: The switch comprises a circuit from a first output terminal via parallel MOS devices in series with current-sensing resistance to a second output terminal, with alternative high-side and low-side configurations having a load between the second terminal and ground, or the first terminal and the DC supply voltage. An input terminal for a digital control signal is coupled via an input diode and two Schmitt Trigger CMOS inverters to a control lead for the gates of the switch. A current overload or short circuit protection circuit coupled between the current-sensor and the input diode comprises two transistors coupled by a diode. A built-in test circuit for indicating the switch condition (on, off, shorted or open) comprises MOS transistors having their gates connected to voltage dividers at the two output terminals, and their drains connected to discrete indication terminals.

Abstract: The apparatus comprises a high voltage disconnect and load isolation switch. During normal operation commercial power is conducted through a pair of contacts "a" and "b" to a load. When a high voltage (HV) component is detected by an HV pulse detector, a command from the HV detector opens a secondary power interrupter while simultaneously activating the opening of contacts "a" and "b". A surge protector conducts some of the HV energy greater than the source, or commercial power, to ground. As contacts "a" and "b" open, HV ground probes are positioned at a slight distance (dielectric constant equal to the commercial power source) from these contacts. These probes provide a ground source for an HV component throughout the complete transition of contact "b" to the rest position, which will be at ground potential. There is now full isolation from the source power supply.

Abstract: A programmed turnaround generator for a mechanically scanned antenna, to provide an n-bar scan pattern (n may be 1), with predetermined inputs to the generator comprising a desired turnaround time, a maximum excursion of the antenna in azimuth, and a start position for each bar, is mechanized using closed form equations such as:AZ.sub.t =C.sub.1 -C.sub.2 .multidot.(t').sup.2EL.sub.t =C.sub.3 +C.sub.4 .multidot.t'.multidot.(.vertline.t'.vertline.-C.sub.5)where t' is a function of a real time clock, C.sub.1 is the azimuth position at the middle of the turnaround. C.sub.2 is a multiplier for azimuth. C.sub.3 is the elevation position at the middle of the turnaround. C.sub.4 is an elevation multiplier, and C.sub.5 is the desired time of offbar or turnaround time.

Abstract: The 19.1 propagation X-cut of berlinite (AlPO.sub.4) has been discovered to have cubic temperature compensation for surface acoustic waves (SAW). The temperature variations of frequency or time delay over a 35.degree. to 85.degree. C. temperature range are comparable to ST-quartz. However, berlinite has at least twice the piezoelectric coupling. This is essential for low insertion loss, broadband SAW devices such as filters and correlators. In addition, 19.1 propagation, X-cut berlinite has lower volume wave spurious than ST-cut quartz.

Abstract: An Automatic Flight Control System for helicopter control includes an amplifier unit having several modules, some of which are in duplicate. The tester comprises plugs with test jacks for connection to an amplifier unit and to a normal flight director indicator, so that the amplifier unit may be tested as a unit the way it is used in the aircraft. The tester includes an AC signal source for jumpering to test jacks to simulate input signals, resistors to simulate the servomechanism load, a heading simulator, and switches to simulate system connections of direct-current power for the different functions. The tester has the capability to test all circuits in the chassis and simulate all input signals used on the aircraft, while monitoring and comparing the dual channel outputs. It provides a method of detecting marriage problems between the altitude module, the altitude integrator module, and the rest of the amplifier unit.

Abstract: An object intended for concealment or a facsimile thereof is used to generate the pattern by creating shadows on a flat surface at several elevation angles, with the resulting set of shapes then rotated in azimuth, in order to produce an abundance of quasi-object shapes within the pattern. The shapes are created in such a way as to be viewing-angle independent, thus producing a background upon which the object is difficult to see from any viewing angle. Selected azimuth and/or elevation angles can also be employed, resulting in patterns that are viewing-angle dependent.

Abstract: The linear frequency modulation (LFM) signal processor may be programmed to be a matched filter for any pulse compression (PC) ratio less than or equal to the square of the number of bandpass filters. The processor is implemented by using a fast Fourier transform (FFT) for the filter bank. The implementation shown assumes digital processing at baseband using in-phase and quadrature (I and Q) channels and an FFT for the filter bank. The I and Q channels are fed through a sidelobe filter, a short input tapped delay line, and a set of M complex multipliers to the FFT. The FFT outputs are connected to a long tapped delay line through a second set of complex multipliers whose outputs are summed in the long tapped delay line summer.

Abstract: The computer system for missile guidance comprises five parallel processors interconnected by a global bus; with each processor having its own CPU, program memory, temporary memory, and two critical variable memories, interconnected by a local bus. The program memory and critical variable memory are hard MNOS to survive nuclear radiation. Each processor has its own cycle time, synchronized by a master clock. In each processor, the cycle has three phases for intercommunication, task processing, and critical variable storage. Thus the critical variables are stored only after task processing is completed.

Abstract: This invention is a modification to the ABC range correlators of U.S. Pat. No. 4,095,222 to Mooney, Jr., used in medium PRF radars. It extends the functioning of the range correlators to not only derive target unambiguous range while suppressing detections of clutter discretes but also to reduce the occurrence of false target reports (range ghosts) and blanking of true targets that would otherwise occur when the radar is operated in dense target environments. The specific point of novelty in this design is the operation of two sets of correlators, designated ABC and A'B'C', each with a different M of N detection criterion.

Abstract: A fiber optic data distribution system is disclosed for distribution of the phase shift commands to an electronically steered antenna array. Novelties include the fan-out of a single bundle to multiple receptors, equalization of optical path for precise synchronization, the use of the RF active side of the antenna for data distribution, the use of the antenna radome as support structure for the fiber optics, and an optical reflector to divert light from the plane of the radome to the transmit/receive element.

Abstract: The electrical supply system on aircraft may employ a constant speed drive (CSD) to convert variable engine speed to constant speed for operation of synchronous 400 Hz electrical generators. The heart of these devices is a differential which mechanically sums the input of two shafts and outputs this sum to a third shaft. Connected to this third shaft is a constant speed synchronous generator. Connected to one of the input shafts is the turbine generator (most likely through gearing). The second input shaft is connected to a speed compensating drive which accounts for engine speed changes. The speed compensating device disclosed herein is an electrically compensating motor/generator arrangement. Bidirectional power flow in the electric compensation link uses two high-speed, permanent-magnet, three-phase machines interconnected by a power conditioning network. One machine is operated as a brushless dc machine, while the other functions as a variable speed synchronous machine.

Abstract: The multilayer capacitor has the plates arranged vertically, which allows planar attachment with conductive epoxy to a substrate such as a thick film conductor on alumina. The top termination may use wire bonding. The capacitor has the same form factor and size as prior capacitors of the same electrical ratings.

Abstract: Multibeam lens antennas are often circular, and utilize propagation in disk-shaped parallel-surface regions. There is phase correction through terms in .theta..sup.2, where .theta. is the angle of an aperture point measured from the boresight direction. In the new designs herein, the lens comprises two portions, each being two closely spaced plates with a dielectric medium between them. One portion is formed as a surface of revolution (cylindrical or conical) with two circular ends, one end being an aperture with element feedpoints coupled to array elements. The other portion is a cap joined to the other end of the first portion. The cap may be a disk or a segment of a sphere. The dimensions and indices of refraction are selected to provide focus points for feed ports, with each focus being for a specific beam direction. The parameters may be selected so that the focus points are within the cap, at the periphery of the cap, or at the aperture. Some of the new designs have phase correction through .theta..sup.

Abstract: A NAVSTAR satellite has a navigation antenna array beamed toward the earth. A communications antenna array for communicating with other satellites requires a pattern null near the axis and high gain to the sides with minimum losses. This is achieved with a dipole ring array comprising eight elements surrounding the navigation array. The ring has a diameter of 1.1 wavelength, and is fed with equal amplitudes and a third mode phase progression, which produces good circular polarization in the far field. For a different sized dipole ring, there will still be an optimum phase distribution which will give good circularly polarized patterns.

Abstract: An auxiliary circuit for remote control of television receiver blanking (audio and video) by digital code words transmitted as part of the video signal. The circuit detects and decodes the transmitted code and depending upon the code received, blanks either or both the audio and video signals in the receiver. A selector switch would be interconnected with the digital decoder to permit selection of particular code words which will cause the circuit to blank. The selector switch will normally be available for the television viewer to control. The transmitter for transmitting the digital code in the preferred configuration would comply with FCC Rules and Regulations specifying program related ASCII transmissions on line 21 of picture field 1.