DOI:10.1049/ree.1982.0009

出版商:IERE    

年代:1982

数据来源: IET

摘要:

The technical and financial success of a microprocessor based design project can be profoundly influenced by the performance of the development system. This paper reviews types of system commonly in use today, and establishes some approximate measures of performance. Then follows a review of the features and facilities which a good, stand-alone system should include, i.e. texteditor, assembler, linker, debugger, in-circuit emulation and logic analyser, including a brief discussion of different ways of implementing some of these features and the consequent impact on system performance. Finally an attempt is made to establish criteria whereby the performance of a development system may be evaluated in terms of its intended application.

DOI:10.1049/ree.1982.0010

出版商:IERE    

年代:1982

数据来源: IET

摘要:

A review is presented of the problems inherent in transmitting data over h.f. links. The propagation medium imposes characteristics of time and frequency dispersion, fading and delay distortion upon the transmitted signal, particularly when wide bandwidths are used. The magnitude and variability of these features are quantified and a simplified expression for the received signal is derived. Techniques that have been used to transmit high data rates over h.f. links are summarized and their relative merits compared. It is concluded that the ionosphere continues to be a limiting factor in the design of an efficient modem, but that recent developments in microelectronics provide the potential to make a significant improvement in the performance of future communication systems.

DOI:10.1049/ree.1982.0011

出版商:IERE    

年代:1982

数据来源: IET

摘要:

This paper follows the introduction of a typical microprocessor-based product through a medium-sized company and specifically identifies the training needs of the technicians.The technician job functions are identified, where they are in the company, and the tasks they will be expected to perform.A microprocessor-based test system is described, and the specific product differences from its predecessors used to identify the re-training requirements.Suggestions are made for training modules for various skill grades and jobs.This detail is then consolidated into a company training programme covering a three-year period aimed at ensuring that the technicians are taught what they should know when they need to know it.It is concluded that successful training must be specific to the application, with tight links between the teachers and the industrial environment.

DOI:10.1049/ree.1982.0012

出版商:IERE    

年代:1982

数据来源: IET

摘要:

The paper describes the radar configurations known as bistatic and multistatic, in which one or more receivers are situated remotely from a radar transmitter, but operate in co-ordination with the transmitter to provide range and bearing information for targets illuminated by the transmitter beam. The advantages of such passive, remote receiver installations are discussed. The main part of the paper is devoted to two topics: a description of ways in which the necessary synchronization reference signals may be provided to the receiver without the need for any fixed telecommunication link between transmitter and receiver; a description of the way in which target range and bearing information in bistatic systems may be obtained by fast, real-time, numerical solution of the bistatic geometrical relationships. An experimental, totally-independent, bistatic receiver using the transmissions from a u.h.f. air traffic control radar is then described and its performance discussed. The paper concludes with mention of future work with such a receiver, to include the provision of moving target information and a multiple-beam phased-array receiving antenna.

DOI:10.1049/ree.1982.0013

出版商:IERE    

年代:1982

数据来源: IET