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| Number | Title | Issue Date |
| 5926128 | Radar systems 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 outp... | 07/20/1999 |
| 5250953 | Tracking radar systems 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 ta... | 10/05/1993 |
| 5039994 | Dipole arrays An antenna formed by an array of dipole elements fed by a triplate or stripline system is provided with earthed posts between the dipoles. These posts prevent radiation from one dipole being received by others thereby improving the antenna efficiency.... | 08/13/1991 |
| 4843398 | Tracking radar system 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 actuall... | 06/27/1989 |
| 4728795 | Optical target detection systems 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 th... | 03/01/1988 |
| 4689593 | Transformer with balanced transmission lines 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 ... | 08/25/1987 |
| 4626855 | Radar, sonar and similar systems 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 gat... | 12/02/1986 |
| 4562438 | Radar apparatus 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 f1 transmitted during time interval t1 to t2. A second, longer pulse of frequency f2 | 12/31/1985 |
| 4496924 | Pulse transformer having conductive shield around magnetic core material 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... | 01/29/1985 |
| 4494167 | Inductor 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 ins... | 01/15/1985 |
| 4482848 | Controllable power source 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 conver... | 11/13/1984 |
| 4449181 | Data processing systems with expanded addressing capability 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 contr... | 05/15/1984 |
| 4439786 | Apparatus and method for processing television picture signals and other information 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 simu... | 03/27/1984 |
| 4439715 | Apparatus for accurately moving a body in accordance with a predetermined motion 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 lin... | 03/27/1984 |
| 4434424 | Side lobe canceller for radar systems 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 component... | 02/28/1984 |
| 4424575 | Text processing system including means to associate commentary with text 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 tra... | 01/03/1984 |
| 4423386 | Multisignal amplification 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 ampli... | 12/27/1983 |
| 4420983 | Mass flow measurement device 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 i... | 12/20/1983 |
| 4419670 | Dual feed box horn antenna 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 TE01 and TE03 mode, which is generated within the box ho... | 12/06/1983 |
| 4418360 | Image processing 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 establ... | 11/29/1983 |
| 4412219 | Secondary radar responders The invention relates to secondary radar responders which provide a reply in response to a radar signal received from a primary radar transmitter. The frequency of the received radar signal is monitored by the responder and the frequency of the response i... | 10/25/1983 |
| 4412185 | Feedforward amplifiers A feedforward amplifier is designed to exhibit particularly linear transfer characteristics in which distortion signals introduced by the amplifier itself are monitored and the phase and amplitude characteristics of respective adaptive equalizers are modi... | 10/25/1983 |
| 4405402 | Piezoelectric/pyroelectric elements Piezoelectric and pyroelectric elements made from polarized plastics substances such as polyvinylidene fluoride are of considerable interest in a number of fields. Unfortunately, they also suffer from a number of not insignificant drawbacks. Specifically,... | 09/20/1983 |
| 4404622 | Stabilized power supply A stabilized power supply which is particularly suitable for use at very high voltages derives its energy from a resonant inverter feeding a transformer and rectifier. The power supply is intended to be operated in a pulsed mode with the generation of eac... | 09/13/1983 |
| 4395088 | Color selective filters A color selective filter in the form of a holographic reflector is produced by a method which includes the step of exposing a photosensitive film of gelatine to a monochromatic laser beam. In order to obtain acceptably short exposure times and to enable s... | 07/26/1983 |
| 4393515 | Processor arrangement A processor arrangement consists of a number of individual autonomous processor units which communicate with each other by means of electro-magnetic waves. The electro-magnetic energy is typically at infra-red optical frequencies. Although the energy nece... | 07/12/1983 |
| 4389648 | Doppler radar system In a Doppler radar system any one received signal contains components having different Doppler frequencies. This is because the received signal is derived from reflections off a range of different positions within the beamwidth of the system. It is often ... | 06/21/1983 |
| 4388623 | Antennas The invention provides an antenna having a large area reflector formed of a plurality of conductive slats of carbon fibre re-inforced plastics material having air gaps therebetween. The slats are mounted on a supporting and shaping framework which is of l... | 06/14/1983 |
| 4384294 | Stabilized antenna arrangement A stabilized ship borne antenna arrangement is provided with an antenna which is stabilized against pitching and rolling motions of the ship on which it is mounted. The antenna is intended to rotate in azimuth about a stabilized vertical axis and it is mo... | 05/17/1983 |
| 4383443 | Liquid-level measurement A liquid-level measuring device including, in effect, two similar elongate members each adapted to be partially submerged in a liquid, the two elongate members being displaced lengthwise relative to one another by an odd number of quarter wavelengths of a... | 05/17/1983 |
| 4380765 | Radar systems A target tracking airborne active radar system in which a reduction in transmitter power is achieved by using individual amplifiers in the aerial quadrant channels. The amplifiers provide gain on transmission and negligible loss on reception and are reali... | 04/19/1983 |
| 4367446 | Mode couplers The invention provides a mode coupler arrangement comprising a main waveguide coupled via arrays of slots to two sets of subsidiary waveguides over a common length. One set of subsidiary waveguides is such as to support one mode of propagation and the oth... | 01/04/1983 |
| 4364628 | Optical sights The invention provides a stabilizable optical gun sight including an optical system having an eye piece and an objective lens and between the eyepiece and objective lens, two optical wedges which are arranged to be driven differentially and together in or... | 12/21/1982 |
| 4359695 | Electronic amplification systems For many applications it is desirable that electronic amplifiers have good linearity (a typical such application is in the field of high frequency radio transmission). Various arrangements and designs have been employed to ensure that the desired linearit... | 11/16/1982 |
| 4359281 | Method and apparatus for testing the braking efficiency of machines In a known method of testing braking effectiveness, a sheet carrying a series of lines is attached to a moving part of a machine and these lines are sensed sequentially by a photo detector as the machine part moves. The output of the photo detector thus g... | 11/16/1982 |
| 4359696 | Amplifiers A feedforward amplifier compensates for distortions introduced by a main amplifying device by comparing the amplified signal with the original unamplified signal and producing a correction signal, which is related to the difference. The correction signal ... | 11/16/1982 |
| 4348109 | Sights The invention provides a gun sight into which an aiming mark in the form of a cross is introduced. A rotatable reflector scanning an LED array directs an image of the array first towards one light transmission system and then towards another during the co... | 09/07/1982 |
| 4337439 | Wide band amplifiers A distributed amplifier is provided with an output filter line with the output terminals of a plurality of individual amplifying devices connected to different points along the output filter line. Instead of dimensioning the impedance of the output filter... | 06/29/1982 |
| 4336538 | Radar systems The invention provides a radar system in which the average power output of the radar transmitter is increased to a value above its rated mean power output during a dwell time during which the radar beam traverses a target of interest. The increase in the ... | 06/22/1982 |
| 4336606 | Wind speed measurement Wind is the large-scale movement of air from one place to another. It is usual for the air to become horizontally stratified, the layers nearer the ground moving more slowly than or in a different direction to those higher up. This change of wind speed wi... | 06/22/1982 |
