WorldCat Identities


Works: 287 works in 288 publications in 1 language and 288 library holdings
Genres: Software  Bibliography 
Classifications: TA1057.A1,
Publication Timeline
Mode S data link phrase coding : further development of the phrase source language 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)
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)
Binary pseudo random phase correlation in radar systems - a new approach by M Dean( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

The growing requirement for low probability of intercept characteristics in radar sensors is producing increasing interest in continuous wave (cw) radars. Pure cw radars have no inherent ranging capability, and it is therefore customary to modulate the cw transmission in some way if ranging is required. An increasingly popular modulation scheme is Binary Pseudo Random Phase Coding (BPRPC), whereby the phase of the transmitted signal is switched between O degs. and 180 degs. under the control of a binary pseudo random sequence of length n, variously known as a pseudo random code, maximal sequence or Galois Code. Techniques for achieving the correlation of binary pseudo random phase coded signals in doppler radar sensors are discussed. A new design based on current technology is developed which potentially offers both a low cost and highly integrable solution. Prototype hardware is constructed and tested and its performance compared with other designs. Excellent performance is achievable without the penalties of size and weight which the other designs carry. Australia. (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)
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)
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)
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)
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)
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
The use of the MASCOT philosophy for the construction of Ada programs by Gustav 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)
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)
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)
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)
Rumford and the teapots : demonstration of the formation of thermal images by E. H Putley( Book )

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

A modern version of an experiment originally performed by Count Rumford is described. This enables us to demonstrates some of the factors concerned in the formation of thermal images. The images obtained with a pyroelectric vidicon thermal imager are compared with the visible images to demonstrate the effects of the surface characteristics of the objects in the scene. Demonstrations of transmission and reflection effects using a modified Leslie cube are also included. (Author)
An annotated bibliography of congestion control in packet-switched communications networks by D. P Taylor( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

The control of congestion in packet-switched networks is a topic which has attracted considerable interest particularly over the past few years when it has been recognised that effective congestion control is an essential feature of network design if reliable communications are to be maintained under adverse conditions, such as traffic overloading, failure situations and in damage. However, because congestion control necessarily embraces all other network control mechanisms, such as routing, flow control, deadlock prevention and buffer assignment strategies, the complex resultant control problem is difficult to analyse and is indeed still an active area of research. This paper provides an annotated bibliography of some of the more important publications in the open literature which deal with pertinent aspects of congestion control. (Author)
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
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)
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English (21)