WorldCat Identities

ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (England)

Overview
Works: 287 works in 288 publications in 1 language and 288 library holdings
Genres: Software 
Classifications: TA1057.A1,
Publication Timeline
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Most widely held works by ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (England)
Mode S data link phrase coding by P. T Humphrey( Book )

2 editions published between 1985 and 1986 in English and held by 2 WorldCat member libraries worldwide

This document suggests improvements to a proposed method of phrase coding for the Mode S Data Link and describes some testing of the phrase programming language. Keywords: Great Britain; Mode-S Secondary Surveillance radar. (Author)
Performance predictions for bulk chalcogenide gratings produced by the photodissolution effect by C. W Slinger( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

Gratings produced by the photodoping of chalcogenide glasses are shown to have great promise for use as diffracting elements in the red to far infrared (up to 15 micron). In principle, they are simple to fabricate - phase gratings being produced by mask exposure or holographic techniques. The performance of bulk, rectangular phase gratings is investigated using a coupled wave model and a detailed analysis performed in the thin, multiwave and volume diffraction regimes. High efficiencies (> 97%) are found to be achievable in the multiwave regime. Based on available material data for silver doped arsenic sulphide glasses, the optimum parameters for operation at 632.8 nm, 4 micron and 10.6 micron are calculated. The maximum efficiencies likely to be achieved and angular responses are evaluated. Great Britain. (rh)
Line Finding Algorithms for SAR (Synthetic Aperature Radar)( Book )

1 edition published in 1985 in English and held by 1 WorldCat member library worldwide

This memorandum addresses the problem of locating linear features, not necessarily straight, in Synthetic Aperture Radar images. The characteristics of such features and the way in which these characteristics affect the desired properties of line finding algorithms are discussed. Two line detection algorithms are then described: the Hough transform, and the dynamic programming technique. Results of applying both algorithms to simulated and real SAR images are given. The Hough transform is found to be too restricted to be useful for this application. The dynamic programming technique locates lines well. The problem of spurious lines appearing in clutter is discussed. (Great Britain)
Fine resolution errors in secondary surveillance radar altitude reporting by D. B Jenkins( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

The reliability of aircraft pressure altitude information telemetered via Secondary Surveillance Radar (SSR) links has come under considerable scrutiny recently following proposals for the implementation of Airborne Collision Avoidance Systems such as TCAS II and similar ground based systems. Certain persistent faults in the SSR pressure altitude replies, known to have deleterious effects on the functioning of TCAS II, have been traced to malfunctions in the three C bits used to encode the fine resolution part of the SSR pressure altitude verification procedures. C bit faults have therefore been investigated for aircraft using UK airspace and transmitting SSR Mode A Identification Codes other than the Conspicuity Code 4321 and 4322. Of 132,773 aircraft trajectories investigated, 581 trajectories, involving at least 68 aircraft, were found to exhibit a C bit fault, a frequency of occurrence of 0.44%; Great Britain. (rh)
Specification of Viper2 in Z by D. H Kemp( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

As a continuation of the use of the specification language Z which was used to specify the Viper 1 microprocessor this paper covers the specification of the Viper 2. This was completed before the definitive HOL specification was complete, therefore there is no proof of correspondence between the two. Using Z did highlight inconsistencies in the HOL specification that may not have appeared until later in the specification. Great Britain. (rh)
GaAs Varactor Diode MMIC (Monolithic Microwave Integrated Circuit) Fabrication Technology( Book )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

The design criteria and techniques developed to fabricate a monolithic low series resistance N on N+ GaAs varactor diode and the associated microwave circuit are described. Details of a high resolution polyimide patterning process developed for this device are included as is a description of the experimental work carried out to establish the practical design rules for the polyimide dielectric on chip capacitors. A description of the seven level mask set and associated processing are included and an assessment of the yield obtained on several wafers is discussed. The processing technology described in this memo has been successfully transferred to UK industry
The design and implementation of an operational, computer-based weather radar system by A. P Ball( Book )

1 edition published in 1979 in English and held by 1 WorldCat member library worldwide

This memorandum describes the work of the RSRE Weather Radar Division in the Ground Radar and ATC Group who in co-operation with the Meteorological Office Radar Research Laboratory (Met O RRL) at RSRE have installed an operational weather radar system at Camborne, Cornwall. This is the first of a number of installations soon to be installed by the Meteorological Office. These will form an operational network of weather radars to enable quantitative rainfall data to be made available to meteorologists, hydrologists and others remote from the radar stations. (Author)
Ion implanted GaAs microwave FETs( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

The combination of ion implantation and photolithographic patterning techniques has been applied to the fabrication of GaAs microwave FETs. This approach was adopted with the aim of providing a large number of devices having consistently predictable dc and high frequency characteristics. This memorandum concentrates on a description of the technology research carried out between 1983 and 1986 which culminated in the successful demonstration of a processing scheme meeting this objective. To validate the accuracy and repeatability of the high frequency device parameters, and X-band microwave circuit has been designed and realized. The performance of this circuit, a buffered amplifier, was very close to the design specification. The availability of a large number of reproducible, well-characterized transistors has enabled work to commence on the development of a large signal model for FETs. The preliminary work in this area is also described in this report. Great Britain. (rh)
Monte Carlo analysis of lateral collection diode arrays by A. P Davis( Book )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

The determination of the thermally generated, diffusion limited leakage current density of lateral collection diode arrays is not possible analytically except for those with the simplest of geometries. It is shown here how the simulation of a spot-scan experiment, using a Monte Carlo analysis, can be used to determine the leakage current density of an array of any geometry. In particular, it is used to analyse a diode array of hexagonal symmetry as a function of array geometry and bulk diffusion length. The analysis shows that the leakage current of a diode may be substantially reduced by the presence of nearby reverse-biased diodes
The evolution of methods of Air Traffic Control by P. T Humphrey( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

This Memo proposes a means whereby ATC methods could evolve to take advantage of developments in civil airline avionics and the opportunity of an ATC air-ground data link. (Author)
Investigation of the effect of annealing on the dislocation and sub-grain boundary content of solvent-evaporation-grown CdTe by N Troughton( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

Solvent-evaporation grown CdTe wafers have been examined using optical microscopy and etching techniques to determine the sub-grain boundary structure and density. The results indicate that the material contains sub-grains of the order of 100-300 micron in diameter, the boundaries of which are formed by polygonised dislocations in densities exceeding 100,000 per cm. Annealing for periods of more than 24 hours at temperatures above 800 deg C leads to a reduction in the subgrain boundary dislocation density and, in the best case, to complete removal of some of these boundaries. (Author)
Curt : the command interpreter language for Flex by I. F Currie( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

Curt is an interactive command language for the Flex computer system. Since one feature of Flex is its treatment of procedures at first class data objects, the creation and calling of procedures is the most important part of Curt. In addition, Curt handles a wide spectrum of types of values in as uniform as manner as possible and is a very flexible tool for the construction of programs. (Author)
RSRE (Royal Signals and Radar Establishment) 1985 Research Review( Book )

1 edition published in 1985 in English and held by 1 WorldCat member library worldwide

Contents: Radar and Microwaves, Communications and Computing, Signal and Data Processing, Infrared and Lasers, Solid State Physics and Displays, Historical Review, and Publications. (Great Britain)
Developments in United Kingdom waveguide power standards by P. J Skilton( Book )

1 edition published in 1980 in English and held by 1 WorldCat member library worldwide

The United Kingdom national standards for power in waveguide consist of bolometer mounts of known efficiency at discrete frequencies from 8.2 GHz to 35 GHz. This report outlines recent developments in the design, construction, calibration and use of the standards. An analysis of random and systematic uncertainties in the microcalorimeter method of calibration forms a significant part of the report and yields an overall uncertainty of + or - 0.1% in the mount efficiency with 95% confidence. Features of a technique for calibrating power meters in terms of a bolometer standard using a waveguide transfer instrument are described together with an analysis of uncertainty in the technique. Comparisons in the past five years of the RSRE developed standards with other power standards are also summarised. (Author)
Eye movements and visual search : a bibliography by Karen Carr( Book )

1 edition published in 1983 in English and held by 1 WorldCat member library worldwide

Over 700 references describing past work related to eye movements and visual search are listed and qualified using a keyword system. The bibliography is intended as the starting point for a research programme on visual search for military targets viewed through electro-optical imaging systems
Software fault tolerance by L. N Simcox( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

The main principles of software fault tolerance are presented and various schemes for achieving it are described, with emphasis being placed on the N-version programming and the recovery blocks schemes. The areas of research discussed include reliability modeling, version independence, and system simulation. A brief description of the use of software fault tolerance in aerospace applications is given and the important subject of cost-effectiveness is addressed. The potential benefits to Air Traffic Control systems are identified together with areas where further study and research are desirable. (rh)
On the privacy problems involved in allowing access to computers via the public telephone system by S. C Giess( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

This report discusses some privacy problems involved in allowing access to computers over the Public Switched Telephone Network (PSTN). The relevant aspects of current land-line PSTN and cellular radio operations are described and the weaknesses of the access controls of current computer systems are discussed. Possible solutions that would allow access under a limited set of conditions are described. Great Britain. (rh)
Determination of oxygen and carbon in silicon wafers by R. W Series( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

Possibilities for the use of a dispersive infrared spectrophotometer to determine the oxygen and carbon content of device quality silicon wafers have been examined. A novel approach to the analysis of the spectra bassed on a curve fitting method has been employed. This has been shown to provide very good rejection of interferences due to absorptions caused by precipitates present in heat treated material. Single instrument precisions for measurements on 350 micrometers device quality wafers of better than 10% for oxygen and + or - 2 x 10 to the 16th power/cc for carbon with no correction for wafer backsurface finish are reported. (Author)
Automatic Prober for the DC Characterisation of Gallium Arsenide Devices. Part 2. The Data Sorting and Display Facility( Book )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

The Automatic Device Probing System used in the Microwave Devices Division (DP2) comprises separate measurement and data handling facilities. The measurement facility is described in RSRE Memorandum 4065 and the data sorting and display facility forms the subject of this memorandum. The facility described is designed to assist in analysing the large quantity of measured data obtained from device wafers and allows general trends as well as individual device parameters to be investigated. Programs have been written to produce maps which allow parameter variations across wafers to be assessed and additional routines are available which present the data in histogram form. These options allow the numeric as well as the geographic distribution of the data to be investigated. Three main types of map display are available, these display the variation in magnitude of a device parameter across a wafer, the location and nature of the failure of any failed devices and the location of devices with a specified combination of parameters
The design of modulation doped heterostructures by Joel Kane( Book )

1 edition published in 1986 in English and held by 1 WorldCat member library worldwide

This memo presents a set of design rules for the thickness and doping levels of the various layers of a modulation doped heterojunction. It is shown how to optimise the heterostructure so that there is no parasitic parallel conduction and for the maximum low temperature mobility. (Author)
 
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English (21)