WorldCat Identities

ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (England)

Overview
Works: 288 works in 288 publications in 1 language and 288 library holdings
Genres: Software 
Classifications: QA76.8.V56,
Publication Timeline
.
Most widely held works by ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (England)
Readout and signal conditioning for a linear pyroelectric array by Paul Manning( Book )

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

The requirement for low-cost infrared sensors for a range of applications has led to the development of linear pyroelectric detector arrays of up to 64 elements, integrated with MOSFET readout electronics and low-microphony packaging to give compact and easy-to-use infrared detectors operating at ambient temperatures in the 8-14 micron waveband. Along with these detectors, the necessary signal conditioning techniques have been developed, in order that the best system performance can be obtained whilst maintaining the aims of low cost, low power, and small size. The sensor system described here uses the VX 8-647 detector, developed under DCVD contract at Philips components Ltd. This detector is a 64 element ceramic pyroelectric array, with fully reticulated elements and with thermal and vibration isolation by means of a membrane structure. A custom MOSFET readout chip and standard hybrid components within the detector package make interfacing to the detector array very straightforward. The signal conditioning electronics is designed to be low power at low cost, making maximum use of analogue and digital CMOS components. The sensor is configured to be battery powered and transmit data by means of a serial data link. A measured NEDT of 0.25K at 50 Hz line rate is achieved, which accords well with the theoretical predictions. keywords: Great Britain. (fr)
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)
The use of the MASCOT philosophy for the construction of Ada programs by G Fickenscher( Book )

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

The development of computer based systems poses major problems on the people involved. Both, MASCOT (the official design methodology of the UK Ministry of Defence for real-time systems) and Ada (the official programming language of the US Department of Defence for embedded computer systems) claim to offer a solution to the majority of these problems. MASCOT is a programming support environment which is independent of a particular programming language, but it defines its own runtime kernel for parallel execution of different program parts. Ada, on the other hand, offers language constructs to express parallelism of program parts, but Ada enforces a particular design methodology with its language rules. This paper investigates whether it is feasible to combine the MASCOT methodology with the programming language Ada. It demonstrates a possible implementation of a MASCOT Construction Data Base in Ada, and it explains the combination of MASCOT and Ada by using a simple example. (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)
An IKBS approach to image understanding by A. C Sleigh( Book )

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

This memorandum describes a method for extracting 2-Dimensional and 3-Dimensional shapes from scenes made up entirely of straight line segments. A new approach to extracting boundaries is discussed, and a methodology for defining geometrical shapes in PROLOG illustrated. Emphasis is placed on the structuring and control strategy for efficient implementation, and the applicability of IKBS methods to this is demonstrated. (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)
A FORTRAN plotting package for graphic VDUs by V. J Mifsud( Book )

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

A set of plotting routines have been implemented in FORTRAN on DEC LSI-11, PDP-11 and VAX-11 computers to provide a transportable graphics capability to improve data presentation and machine control on vector scan particle beam lithography machines. The routines are general in nature and have already proved to be of use in many scientific applications requiring compact and tailored graphics capabilities within specific programs. This document is designed to act as a User's Guide for the suite. Versions of the routines are available for ReGIS, Tektronics 4010/4014 and SIGMA native mode graphics terminals. (Author)
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)
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)
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)
The Application of Intelligent Knowledge Based Systems to Air Traffic Control( Book )

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

This paper considers the need to explore the approach of Intelligent Knowledge Based Systems (IKBS) towards meeting the pressures for change in future Air Traffic Control Systems. The discussion includes the role of automation in ATC and the suitability of IKBS within a shared approach between controller and machine. Areas selected to provide practical experience of IKBS applied to ATC include Air Traffic Flow Management, Conflict Resolution and Training. Guideline concepts for the introduction of a new technology to ATC are outlined
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
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)
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)
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
Moon bounce communications to small terminals by G. E James( Book )

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

The object of this study is to investigate the feasibility of communications from a large fixed earth station to a small mobile station using moon-reflected signals. A review of the technical problems is presented, and recommendations made on the choice of operating frequency, modulation type and equipment. Suggestions are made for practical trails, using equipment which is already in existence at RSRE Defford
Regular expression analysis of procedures and exceptions by J. M Foster( Book )

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

This paper describes an algorithm used to find properties of computer programs by using algebraic methods. It is capable of handling subroutines and exception exits. A program scheme has been produced to implement it which is particularly aimed at finding properties of microcode programs. This scheme can be systematically instantiated to deal with particular properties. Great care has been taken with the efficiency of the algorithm; it works in practice, even for very complex microcode, in time proportional to the number of microcode instructions. Both the mathematical basis of the algorithm and the algorithm itself are explained. (Great Britain)
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)
Separability and security models by C. T Sennett( Book )

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

This report presents a review of security models and gives a detailed mathematical description of the property of separability, that is the property that certain software can be treated as though it were being obeyed in isolated computers. The description uses the specification language Z, and the proofs required are given in detail
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
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.92 (from 0.87 for Separabili ... to 1.00 for GaAs Varac ...)

Languages
English (20)