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| Number | Title | Issue Date |
| 4862189 | Microwave transformer A microwave balun transformer provides an extension of operating frequency range particularly in conjunction with a cavity-backed spiral antenna (5). The balun cavity (13) has a dipole (15,17) extending between an unbalanced coax port (19) and an opposite... | 08/29/1989 |
| 4833485 | Radar antenna array A close-packed divergent array of cavity-backed antennas for use in the radome of a missile. Each antenna cavity is tapered from its radiating face towards its base so that the antennas can be mounted more closely together while their radiating faces main... | 05/23/1989 |
| 4827263 | Pulse doppler radar system A method of preventing interference between `friendly` pulse doppler radars when in action against a common target or adjacents targets. Despite considerable separation of the radar r.f's the pulsed signals have repeated sideband pulses which may be taken... | 05/02/1989 |
| 4802333 | Thrusters A thruster for use in a spacecraft uses vaporized propellant in its combustion chamber (110). Normally two propellants are used of the kind used for main thrusters so that two vaporization chambers are needed. Pressure valves (108, 109) are controlled by ... | 02/07/1989 |
| 4788547 | Static-split tracking radar systems A static-split tracking radar system with substantially improved performance. The system includes parallel signal processing channels for processing sum and difference signals from a target-seeking aerial array, to produce target tracking signals. Novel m... | 11/29/1988 |
| 4787579 | Gas thruster A thruster system has a main bipropellant propulsion unit including a propulsion engine (50) and bipropellant supply having a tank (3) for an oxidizing agent and a tank (4) for a fuel. An auxiliary cold propellant thruster (21) uses propellant supplied by... | 11/29/1988 |
| 4786018 | Satellite attitude control An attitude control system for satellites includes a sensor (10) for generating output signals in response to variations in the attitude of the satellite. These signals are applied to a Kalman filter (12) which models the dynamic state of the satellite an... | 11/22/1988 |
| 4786335 | Infra-red detector A novel multilayer photoconductive I.R. detector is formed by incorporating alternate p and n-type layers, such that many layers occupy the detector thickness. The detector may be considered as a n-type photoconductor containing buried isolated p-type reg... | 11/22/1988 |
| 4785266 | Dielectric rod polarizer having wedge shape polarizing portions A microwave polarizer is provided in the form of a wedge at the termination of a rod of dielectric material. Preferably the wedge tapers exponentially in order to provide a good impedance match. Circularly polarized radiation propagating along the rod exp... | 11/15/1988 |
| 4776273 | Fuze arrangement for missiles An impact fuze arrangement for a missile in which an electromagnetic field is set up within a compartment in the body of the missile and a warhead detonating signal is generated if the field intensity varies by more than a predetermined amount, as will ha... | 10/11/1988 |
| 4774903 | Mooring tether Several cables extend between a buoyant body to be moored and the sinker on the sea bed. Intermediate spacing members hold the cables apart from one another to maintain the configuration. At zero rotation when the tether formation itself is in equilibrium... | 10/04/1988 |
| 4752779 | Tracking radar systems A missile guidance system having means for deriving from a target angle tracking loop a signal indicative of an apparent movement of a target off a missile-to-target sight line caused by a change in missile attitude, and means for feeding said apparent mo... | 06/21/1988 |
| 4727809 | Detonation safety mechanism A safety device for use in the detonation of explosives, mines etc. Explosives are commonly detonated by a two stage operation, an explosive pellet is moved from a safe to an active position and then a hammer or electrical charge is fired to detonate the ... | 03/01/1988 |
| 4724437 | Signal acquisition circuit with variable bandwidth phase locked loop A signal acquisition circuit for a missile guidance system has a phase lock loop which is responsive to incoming signals received from a target and will lock on to the frequency of the received signal. The bandwidth of the phase lock loop is altered in de... | 02/09/1988 |
| 4692614 | Rotational motion fluid loop sensor using magnetically levitated detecting element A rotational motion sensor has a circular, tubular body (1) filled with a fluid. A sensor head (6) forming part of the body houses a movable detecting element in the form of a piston (7) which is magnetically levitated so that it is kept out of contact wi... | 09/08/1987 |
| 4683348 | Solar cell arrays A solar cell array comprises a common member (13) on which solar cells (4) of a plurality of solar cell units are mounted, the primary reflectors (2) of the cell units being formed on shaped portions of a first unitary member (7) and the secondary reflect... | 07/28/1987 |
| 4673947 | Cassegrain aerial system A high bandwidth microwave antenna feed comprises a spigot (4) of relatively high dielectric constant protruding from a conventional hollow waveguide (3) and a generally conical member (12) of relatively low dielectric constant fitted coaxially onto, so a... | 06/16/1987 |
| 4672330 | Phase-lock loop systems A phase-lock loop system with particular use in radar tracking systems is disclosed. From a number of input signals of varying frequencies such as a carrier frequency and several side band frequencies the system can lock into phase and frequency with the ... | 06/09/1987 |
| 4644793 | Vibrational gyroscope A vibrational gyroscope is provided with a vibrating member in the form of a flexible annular shell extending from a flat flexible plate. In use, the flat plate is vibrated and excites radial vibrations in the lip of the annular shell. When the gyroscope ... | 02/24/1987 |
| 4606256 | Sight system for a stabilized gun A tank gun sighting system in which there is a visual sight having a boresight mark permanently aligned with the gun and in which an electronic aiming mark is superimposed on the visual target scene. The aiming mark is controllable by the gunner with effe... | 08/19/1986 |
| 4532636 | Radio communications receivers In radio communications receivers for use on frequency hopping radio communications networks, the received signal in each hop period is analyzed and assigned a quality value. If more than one signal is present during the hop period it is determined that m... | 07/30/1985 |
| 4529057 | Ear defenders An ear defender for a headset, the ear defender comprising a rigid shell having holes in a central portion to permit the passage of ambient sound and including a valve mechanism to close the holes as required. The shell consists essentially of a unitary c... | 07/16/1985 |
| 4525816 | Sonar arrangements A sonar beam steering arrangement in which a circular array of electroacoustic transducers are sampled in sequence, the samples being digitized and stored serially in a shift register. The register is several cycles long so that samples from all of the `i... | 06/25/1985 |
| 4492939 | Planar, quadrature microwave coupler A microwave coupler device of planar circuit form, similar in form to a conventional branch arm coupler in that it comprises a substrate (23) having a ground plane conductor on one main face and an electrically conductive pattern on the other main face co... | 01/08/1985 |
| 4477834 | Scan conversion circuit A scan conversion circuit for a thermal imager device in which a field is scanned by a parallel-series array of infra-red detectors swept broadside over the field to produce a band of parallel I.R. signals. The signals from the array of detectors are samp... | 10/16/1984 |
| 4476566 | Frequency hopping radio communications apparatus having pseudo-random _channel selection Channel selection in a frequency hopping radio set is controlled by a pseudo-random number generator, the pseudo-random number being used to address an N bit memory (3) which is used to identify each of n available channels from N equipped channels. When ... | 10/09/1984 |
| 4303211 | Radio systems and apparatus A radome aberration correction system in which data relating to the aberration over a range of angles of incident radar signals is stored in a digital data store. The apparent direction of a radar source is corrected by the addition of an aberration value... | 12/01/1981 |
| 4122438 | Position encoding arrangements A position encoding arrangement is provided having a position locating area from which the positioned co-ordinates of a probe in the area can be found. The invention provides for a change of magnification of the arrangement so that movement of the probe p... | 10/24/1978 |
| 4106187 | Curved rigid printed circuit boards A curved printed circuit board is made in accordance with a method which ensures accurate registration between printed circuit patterns carried by the two outer surfaces of the board.... | 08/15/1978 |
| 4101935 | Electron beam reading arrangements An electron beam is used for reading signals in the form of surface modulations on a thermoplastic recording. In order to improve the signal to noise ratio the thermoplastic recording is first charged using a flood beam source of electrons and the surface... | 07/18/1978 |
| 4100511 | Delay line oscillator locked to a selected frequency of a chirp delay line An oscillator uses a delay line in a feedback loop to determine its frequency of operation. As the loop is capable of sustaining oscillations at more than one frequency the desired frequency is generated by an auxiliary delay line and is gated into loop a... | 07/11/1978 |
| 4099855 | Liquid crystal display arrangements A liquid crystal display arrangement is provided with two liquid crystal cells containing twisted-nematic material, and positoned one cell behind the other. Both cells are between a pair of crossed polarizers, and the arrangement can be used to selectivel... | 07/11/1978 |
| 4077131 | Magnetic compass arrangements A magnetic compass arrangement for use on a road vehicle consists of two magnets mounted so that tilt or acceleration of the vehicle produces equal and opposite errors in them. The errors are cancelled and a substantially error free output signal represen... | 03/07/1978 |
| 4060806 | Phased array radars A phased array radar having a plurality of antennae, each connected with a respective receiving channel, is provided with apparatus to suppress variations in phase and gain in the receiving channels. The apparatus injects a reference signal into a normall... | 11/29/1977 |
| 4059827 | Molecular information storage systems A thermoplastic film is used to record data in the form of variations in molecular orientation of the polar molecules. The film is softened by heating and the data recorded, after which the film is cooled to retain the recorded molecular orientation.... | 11/22/1977 |
| 4054825 | Control arrangements A control arrangement is described for angularly positioning a member such as an aerial structure in which a potentiometer has a continuous circumferential winding with two sets of tappings of at least two tappings and at least three tappings respectively... | 10/18/1977 |
| 4044314 | Frequency synthesizers A frequency synthesizer in which the frequency of a variable frequency oscillator is controlled by means of a control signal and wherein means are provided for determining whether any frequency variation results from a drift in the frequency of the variab... | 08/23/1977 |
| 4040057 | Clutter filter for Pulse Doppler Radar The invention provides an improved clutter filter for a Pulse Doppler Radar utilizing rapidly changing p.r.f.'s. The filter is designed to reduce the effect of spectrum spreading which has previously caused difficulties.... | 08/02/1977 |
