| Patent Number |
Title Of Patent |
Date Issued |
| 5926128 |
Radar systems |
July 20, 1999 |
| A target tracking radar system for a guided missile wherein sum and difference signals from a reception antenna are multiplexed at a variable rate into a single channel receiver, the multiplexing rate depending on an alternating reference signal. The output of the receiver is applied to |
| 5554818 |
Lithium water reactor |
September 10, 1996 |
| A lithium-water reactor for use in a motor, comprises a combustion chamber having means for spraying water onto a charge of lithium so as to cause combustion. The lithium can be provided as separate body or coating on the wall of the combustion chamber and conveniently includes a combust |
| 5250953 |
Tracking radar systems |
October 5, 1993 |
| A tracking radar system comprising an aerial arrangement having a plurality of outputs, means for deriving from the aerial outputs a sum signal representative of the sum of the aerial outputs and a difference signal representative of the direction of a target relative to the aerial, a |
| 5194870 |
Radar receiver |
March 16, 1993 |
| FMCW radar return signals are converted to i.f. in a front end section, digitised in an A-D converter, and reduced to in-phase and quadrature base band components at a lower sampling rate in a filter section. Returns are compared with a separate reference waveform signal from a generator |
| 5158820 |
Signal carrier supports with apertured dielectric layer |
October 27, 1992 |
| A signal carrying structure comprising a planar conductive member having a major surface, a dielectric layer having a substantially constant thickness, and a conductive track. A first major surface of the dielectric layer is in contact with the major surface of the planar conductive |
| 5134485 |
Television transmitter having amplification modules in which one component of r.f. signal is obt |
July 28, 1992 |
| In a television transmitter having separate picture- and sync-modulated r.f. amplification, the sync-modulated r.f. signal is derived from the picture-modulated signal using a modulator controlled by the video sync signal conventionally present in the transmitter. This simplifies the |
| 5124665 |
Circuit for reducing distortion produced by an r.f. power amplifier |
June 23, 1992 |
| A high frequency SSB radio transmitter has an envelope amplitude modulator for varying the envelope of an r.f. signal source based on an error signal from envelope detectors detecting the envelope of the input and output waveform. It also has a phase modulator for varying the phase of th |
| 5119506 |
Circuit for automatically adjusting the rate of change of amplitude of an output signal over sel |
June 2, 1992 |
| A linearity correction circuit for television transmission operates at intermediate frequency to introduce appropriate pre-distortion into the amplitude envelope to compensate for non-linearity in the power amplifier states. An array of parallel current sources (11), each of which is |
| 4982053 |
Closure arrangement including a radio frequency seal |
January 1, 1991 |
| A closure arrangement comprises an aperture-defining frame, a closure panel member which fits removeably into the frame, and a radio-frequency seal between the frame and an edge of the panel member. The seal is divided into two complementary parts attached respectively to the panel membe |
| 4977617 |
Mixer |
December 11, 1990 |
| A mixer incorporating FET's (4,5) as the switching elements includes a resonant circuit connected as a tank circuit of the local oscillator (6) such that the inherence capacitance of the FET's is automatically compensated for. The harmonic recovery technique is also used by the inclu |
| 4884368 |
Means for forcing apart two structural members of a closure arrangement |
December 5, 1989 |
| An ice breaker arrangement of forcing open the door of an enclosure such as a radio frequency shelter for electrical equipment comprises a threaded stud (3) which, when turned by a key, is made to project from the door frame (5) so as to force a reaction plate (2) attached to the door (1 |
| 4862453 |
Communication system |
August 29, 1989 |
| In a dynamic frame length slotted ALOHA system the synchronizing signals are transmitted by a base station at different frequencies (each having a period equivalent to a multiple of the time slot period). The different frequencies denote different frame lengths and the central stations d |
| 4843634 |
High power systems and method of tuning same |
June 27, 1989 |
| A method of automatically tuning a high power system by measuring the gardient of component value against efficiency for each component impedance in turn and, for each component, finding two points of equal and opposite efficiency-to-impedance gradient and setting the impedance of the |
| 4843398 |
Tracking radar system |
June 27, 1989 |
| In a tracking radar system target glint and multipath sometimes produce signals which falsely indicate high acceleration rates of the target. These signals cause the boresight of the antenna to be driven away from the direction in which the target actually lies.To avoid this problem, rec |
| 4823144 |
Apparatus for transmitting and/or receiving microwave radiation |
April 18, 1989 |
| A microwave radiating system including an antenna composed of a plurality of vertically spaced elements and circuit members connected to feed the elements in a manner such that the amplitude of the energy distribution among the elements and the second derivative of the phase variation in |
| 4807039 |
Motion picture film transport |
February 21, 1989 |
| Motion picture film transport of the kind used in a telecine apparatus uses a common film lacing path between a picture gate and a sound gate for films of different gauges. An audio delay circuit delays the audio signal generated at the sound gate for at least one of the film gauges to |
| 4803378 |
Pulse generator |
February 7, 1989 |
| A pulse generator comprises a capacitor, means for periodically discharging the capacitor to generate pulses of electricity and means for recharging the capacitor between pulses. Means is included for sensing a residual reverse polarity charge on the capacitor after generation of a pulse |
| 4799066 |
Impedance matching arrangement |
January 17, 1989 |
| An impedance matching arrangement is suitable for use with a frequency hopping radio communications system which is operable over a wide frequency band, so as to match the operating impedance of the antenna at each of the frequencies used. As the frequency of the radio system hops fr |
| 4755875 |
Telecine apparatus including an electro-optical image transducer illuminated by a bias light sou |
July 5, 1988 |
| A telecine apparatus uses a line array electro-optical image transducer which is illuminated with bias light in addition to the projection light passing through the film. The bias light serves to operate the transducer on a linear portion of its characteristic, and the bias light is puls |
| 4743859 |
Amplifying circuit arrangement having means for distortion correction |
May 10, 1988 |
| A robust amplifier consists of two delay lines linked by a number of discrete amplifiers. Distortion correction is carried out by distortion feed forward. This is achieved by sampling the output of each amplifier at a coupler and then subtracting this sample from the input signal to late |
| 4733240 |
Phased array transmitter |
March 22, 1988 |
| In a phased array antenna the phase of the signal applied to each antenna element is controlled by a phase lock loop which is locked to the frequency of a reference oscillator but whose phase is offset from it alternatively by introducing a DC offset to an integrator within the phase |
| 4728956 |
Receivers and transmitters |
March 1, 1988 |
| Conventionally, if several tasks have to be carried out simultaneously by receivers and transmitters, then a number of them are required, each having its own antenna.By employing the invention a single receiver or transmitter having one antenna can carry out a number of simultaneous task |
| 4728795 |
Optical target detection systems |
March 1, 1988 |
| The invention provides an infra-red target detection system in which an array of infra-red detectors is scanned vertically in swathes and horizontal scanning is effected by sampling the output of each detector in turn. Addresses of target detections in the vertical and horizontal are |
| 4724438 |
Radar apparatus |
February 9, 1988 |
| The invention relates to a radar system of the type which can be presented with a number of tasks to be performed. Some of these tasks, e.g. the surveillance of areas at close range, may only require the transmission of low energy pulses and thus the full potential of the r.f. energy sou |
| 4689593 |
Transformer with balanced transmission lines |
August 25, 1987 |
| A transformer has a number of single turn primary windings 5 formed by printed circuit tracks on a flexible bendable sheet 3 which is wrapped around a core of the transformer. The primary windings are connected to output terminals 12 of an enclosure 1 of the transformer by another pr |
| 4660005 |
High frequency electrical network |
April 21, 1987 |
| An h.f. electrical network consists of a transmission line device in the form of a closed cavity having two end plates between which extend four quarter wave resonators positioned symmetrically about an axis passing through both end plates. The device is provided with four ports connecte |
| 4626855 |
Radar, sonar and similar systems |
December 2, 1986 |
| A radar apparatus which includes a transmitter that generates a train of pulses arranged in groups of two, each group including a long pulse and a short pulse of different frequencies. These long and short pulses are separated in a receiver by a range gate which passes the pulses through |
| 4616217 |
Visual simulators, computer generated imagery, and display systems |
October 7, 1986 |
| A display system having a screen and two spaced projectors arranged to illuminate respective parts of the screen. The screen includes a diffusor which serves to scatter light incident on the screen at a particular point in a manner such that more of the light is propagated, after scatter |
| 4614426 |
Passive target detector |
September 30, 1986 |
| Passive target detectors which employ infra-red sensors may have difficulty in distinguishing between a cool target near the detector and a warmer one further away.A detector detects a source of infra-red radiation and if its size indicates that it may be of interest, a point source dete |
| 4604725 |
Rotary apparatus having code track with pseudo-random binary digit sequence for indicating rotat |
August 5, 1986 |
| A code track on a rotable member (e.g., a disc) defines a pseudo-random sequence of binary digits consisting of ones and noughts. The pseudo-random sequence extends continuously around the rotatable member and includes a given number of n consecutive noughts. The binary digits of the |
| 4604589 |
High frequency circuit |
August 5, 1986 |
| A high frequency circuit is arranged to modify a signal, such as a television broadcast signal, prior to high power amplification so as to compensate for distortions introduced by the amplifier. Separate signal paths give independent adjustment of the differential gain, differential |
| 4596153 |
Vane for use in monitoring flow of a fluid |
June 24, 1986 |
| A flowmeter has a vane which is caused to vibrate at one of its resonant frequencies and a flexure standing wave set up along it. Two piezoelectric sensors are used to monitor characteristics of the standing wave and hence the mass flow rate of a fluid flowing past the vane along a pipe. |
| 4565983 |
Filter |
January 21, 1986 |
| The invention uses acousto-optic interaction and a spatial light modulator to provide a filter whose characteristics can be rapidly changed.An input signal is applied to an electro-acoustic transducer which launches surface acoustic waves along a lithium niobate block. The frequency of the |
| 4562438 |
Radar apparatus |
December 31, 1985 |
| A radar transmitter transmits a group of pulses as shown at I of FIG. 2, the group consisting of first short pulse of a frequency f.sub.1 transmitted during time interval t.sub.1 to t.sub.2. A second, longer pulse of frequency f.sub.2 is transmitted during time interval t.sub.2 and t |
| 4532480 |
High power amplifier arrangements |
July 30, 1985 |
| A high power amplifier arrangement utilizes a configuration which is similar to that of a distributed amplifier in which the capacitances of a plurality of individual amplifying devices form part of a delay line which couples together the amplifying device, so as to sum the output power. |
| 4528568 |
Slotted dipole with three layer transmission line feed |
July 9, 1985 |
| An antenna arrangement consists of a dipole radiator which is fed via a Triplate three-layer transmission line. The dipole is arranged to radiate and receive plane polarized electro-magnetic radiation having a plane of polarization which is determined by the orientation of an elongate sl |
| 4504758 |
Surface acoustic wave devices having frequency response that can be adjusted |
March 12, 1985 |
| In the manufacture of surface acoustic wave devices it is necessary to manufacture master patterns from which interdigitated electrodes are produced photographically. The manufacture of the master is expensive and a new master is needed for each new device required to operate at a di |
| 4496924 |
Pulse transformer having conductive shield around magnetic core material |
January 29, 1985 |
| A pulse transformer is used in a radar transmitter to transform a high current pulse at relatively low voltage into a very high voltage pulse which can be used to directly drive a magnetron oscillator. The potential of the output pulse can be of the order of 30 kV and since the transform |
| 4494167 |
Inductor |
January 15, 1985 |
| An inductor included as part of a pulse width modulation amplifier is formed by four coils 9A, 9B, 9C and 9D arranged alongside each other and connected in parallel. The coils are supported against electromotive forces tending to pull them together by insulating strips 10. The coils |
| 4482848 |
Controllable power source |
November 13, 1984 |
| A controllable power source is suitable for driving one or more electric motors from a low voltage battery. A converter steps up the d.c. voltage to a higher level at which the motors are designed to operate and a power regulator placed between the converter and each motor regulates the |
| 4482816 |
Pulse circuits |
November 13, 1984 |
| A pulse circuit forms part of a radar transmitter in which a pulse forming network is used to generate a high current pulse at relatively low voltage and to feed it via a transformer to a magnetron which operates at typically 30 kV. A number of pulse forming networks are connected in |
| 4449181 |
Data processing systems with expanded addressing capability |
May 15, 1984 |
| The invention relates to memory-mapping and protection facilities in multi-processor data-handling systems. A feature of the invention relates to systems in which a plurality of processors, including both arithmetic processors and processors for the control of external data handling |
| 4439786 |
Apparatus and method for processing television picture signals and other information |
March 27, 1984 |
| A problem arises when simultaneous attempts are made to write and read from the same location in a random access memory. The invention deals with this problem by delaying the writing operations automatically by a varying amount to prevent attempts at simultaneous writing and reading: and |
| 4439715 |
Apparatus for accurately moving a body in accordance with a predetermined motion |
March 27, 1984 |
| An apparatus is provided for accurately moving a body in accordance with a predetermined motion. An embodiment of the invention relates to an optical scanning system in which the movement of an intermittently tilting mirror is required to be extremely linear. The positions of the mirror |
| 4434424 |
Side lobe canceller for radar systems |
February 28, 1984 |
| A radar receiver has a main channel 2,3 and 4, and an auxilliary channel 7,8 and 12. The main channel is fed from a directional antenna 3 and the auxilliary channel from a relatively non-directional antenna 7. A side lobe canceller consisting of components 5,6 and 9 receives signals from |
| 4424575 |
Text processing system including means to associate commentary with text |
January 3, 1984 |
| A text processing system includes a word processor having a microprocessor controller interfacing a display unit, keyboard and memory. The word processor, in turn, is connected to a tape recording device via an interface unit permitting bi-directional transfer of data between the mic |
| 4423386 |
Multisignal amplification |
December 27, 1983 |
| The present invention provides a modified distributed amplifier which is capable of accepting two or more independent inputs and amplifying them without giving rise to a large number of significant intermodulation products. This modified distributed amplifier effectively comprises two or |
| 4420983 |
Mass flow measurement device |
December 20, 1983 |
| A device for measuring the mass flow of a fluid consists of a body which is arranged to resonate under the influence of a travelling flexure wave. Various embodiments of the invention are described. In certain embodiments in which the resonating body is in the form of a cylinder, the fre |
| 4419670 |
Dual feed box horn antenna |
December 6, 1983 |
| A radar antenna includes a box horn radiator which is capable of simultaneously transmitting X band and S band signals. The S band signals are transmitted as a resultant of the TE.sub.01 and TE.sub.03 mode, which is generated within the box horn. Additionally, the X band frequencies are |
| 4418360 |
Image processing |
November 29, 1983 |
| Pictures produced by a camera are corrected to eliminate the effect of camera shake or of unwanted movement of the camera relative to the subject being viewed. Using the apparatus of FIG. 1 the adjustments required for each frame of a cine film are established by displaying each frame on |
