摘要:

This paper sets out the views of a group of people, mainly Industry Training Board staff, with interests across a wide range of process industries.The aim of the paper is to draw attention to the professional engineering needs of the process industries and ensure the continuation and further development of education and training to meet their requirements.It examines:the changes, particularly in technology, which are affecting the process industries.the implications for the role of their engineering personnel.whether a new approach is needed to the education and training of such personnel.

DOI:10.1049/ree.1981.0040

出版商:IERE    

年代:1981

数据来源: IET

摘要:

Recent advances in technology have enabled a family ofsmall microwave satellite communication terminals to be constructed. This paper describes one of these, a prototype manpack equipment which can be carried by asingle person. It was completed in mid-1978 and has since been demonstrated on numerous occasions.Using a suitable satellite, such equipment can be usedto establish a link with a main SATCOM base station; alternatively manpack/manpack links are possible provided here is a base station rebroadcast. Traffic facilities are either 50 baud duplex telegraph or analogue speech.

DOI:10.1049/ree.1981.0042

出版商:IERE    

年代:1981

数据来源: IET

摘要:

The high temporal sidelobes of compressed combined Barker codes can be reduced using minimum-square-error transversal spiking filters. Very large (40 to 60 dB) peakto sidelobe ratios may be obtained for words up to 169 bits long using transversal filters which are only several hundred bits long. The effect of a Doppler frequency shift of the signal is analysed and a cross-ambiguity diagram is presented for a 52-bit word and a 200-bit filter. The influence of noise and manufacturing tolerance is also considered, and, finally, improvements due to a further shaping of the output are detailed.

DOI:10.1049/ree.1981.0043

出版商:IERE    

年代:1981

数据来源: IET

摘要:

Multipliers of two delta-sigma sequences are proposed in this paper. These multipliers are very simple in circuitry and provide the product in delta-sigma sequence form, permitting simple further processing. The multipliers were constructed and their performance was experimentally measured. It was found that a certain type of multiplier with a relatively simple circuitry, provides a high signal to noise ratio. An application of this multiplier is given for the realization of a parallel type digital correlator.

DOI:10.1049/ree.1981.0044

出版商:IERE    

年代:1981

数据来源: IET

摘要:

This paper describes the microwave automatic network analyser system which has been established at the University of Warwick over the last decade. The different systems of correction which have been utilized are explained in detail, followed by an account of the system development, interfacing units and some new calibration test pieces. A description of the software precedes an outline of various applications. Finally, the advantages of this particular facility are stated and new developments of the system are indicated.

DOI:10.1049/ree.1981.0045

出版商:IERE    

年代:1981

数据来源: IET

摘要:

A 2.4 kbit/s baseband modem is being designed for use at h.f., incorporating modulation/demodulation techniques that are matched to those frequencies and the problems associated with them. Fed by a continuous serial datastream, the modulator functions are implemented wholly by a bit-slice microprocessor, and controlled by another more conventional microprocessor. Analogue output waveforms are generated in a d/a converter, which is driven by the bit-slice machine. Demodulation is performed in a similar device, using an a/d input and giving a serial output.

DOI:10.1049/ree.1981.0046

出版商:IERE    

年代:1981

数据来源: IET