DOI:10.1049/ree.1967.0001

出版商:IERE    

年代:1967

数据来源: IET

摘要:

A passive R-C synthesis is presented for transfer functions containing complex or imaginary zeros in the left half of the p-plane. The poles of the function are required to be negative real.The synthesis procedure is extremely simple and requires very little computation. The networks described and realized are basically twin-T structures which can contain a load, series source impedance or a bridging network depending on the nature of the transfer function to be synthesized. Examples of frequency response curves are given.Primarily this synthesis procedure is intended to provide for the realization of zero sections in active filter synthesis.

DOI:10.1049/ree.1967.0002

出版商:IERE    

年代:1967

数据来源: IET

摘要:

An interim report is given of a survey undertaken during 1963–64 on the failures encountered during a six-month period in 1000 sea-going marine radars of sixty-five different types

DOI:10.1049/ree.1967.0003

出版商:IERE    

年代:1967

数据来源: IET

摘要:

Reliability is probably the most important single factor in marine radar today. Improved components and the introduction of solidstate devices have radically improved the prospects of achieving high reliability, but more comprehensive control of quality, particularly under extremes of environmental conditions, is necessary during design and throughout production. This paper describes how the principles established by the Advisory Group on the Reliability of Electronic Equipment in the U.S.A. were utilized in the design and production of commercial electronic equipment.

DOI:10.1049/ree.1967.0004

出版商:IERE    

年代:1967

数据来源: IET

摘要:

Records of reliability and maintenance of radar equipment on a specified group of ships (deep-sea trawlers) operating from a specified port under controlled conditions are presented. The reasons for the very long ‘mean-time-between-failures’ under these conditions are considered to be: (a) the equipment is not switched on and off but allowed to run for a long time; (b) the operators have been given training on the maintenance of this particular set; (c) the spares provisioning is at a high level, and (d) a rigid system of preventive maintenance is applied. All these factors are considered to be significant in achieving high reliability.

DOI:10.1049/ree.1967.0005

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The paper comments on the general requirements which should be met by designers of marine radar equipments. It suggests that in planning a new design the minimum standard of reliability that should be set is 500 hours mean time between failures. Some basic design precautions are then described covering various aspects of the problem from initial design and selection of components to installation, environmental and operational conditions. Short notes on maintenance and training aspects are also included. The paper concludes with an example of the extremely high reliability achievable by the use of a twin inter-switchable radar system wherein the probability of trouble-free operation over a specified period can be raised from 95.3% to 99.8%

DOI:10.1049/ree.1967.0006

出版商:IERE    

年代:1967

数据来源: IET

摘要:

Experimental investigations into the techniques of far-field ocalizer and glide-path monitoring for Category III I.L.S. installations are described. The results of monitoring at an operational airport over an extended period are presented. Two novel techniques are briefly described: (a) a system of spaced aerials for monitoring beam-bend noise, and (b) an independent side-band receiver for the detection of radio interference.

DOI:10.1049/ree.1967.0008

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The safety requirements of an automatic blind landing system imply that the ground I.L.S. transmitters must have a high ‘integrity’, a high degree of accuracy and reliability. This, in turn, implies that there must be monitors at the transmitters which can measure the main parameters of the radiated signal and react fast to any fault condition.Two types of monitor are available, near-field monitors taking their signals from field probes and internal monitors using signals from the aerial feed cables. A study of internal monitors applied to existing localizers was made as part of the R.A.E. I.L.S. feasibility study and showed that these monitors could provide accurate performance measurements and also that the localizers did achieve the required standard of stability.The integrity of the I.L.S. beacons depends largely on the way in which monitors are used; one possible monitor configuration for blind landing involves four monitors arranged to give good continuity of service and a very high probability that faults will be detected. One monitor measures the performance of the stand-by transmitter and the other three measure the radiated signals; if there is disagreement between these three the action is determined by ‘majority vote’

DOI:10.1049/ree.1967.0009

出版商:IERE    

年代:1967

数据来源: IET

摘要:

A generalized design procedure is presented for the stage by stage build-up of synchronously tuned multi-stage linear amplifiers. The individual stages herein may be near identical and either unilateralized by external passive feedback or mismatched resistively at their ports. The design can be usefully based on the average parameters of the device type selected and its circuit components.This is illustrated by the design of a high-gain amplifier with a large fractional bandwidth utilizing non-unilateral electron devices without unilateralizing feedback. A non-unilateral amplifier was constructed based upon this stage by stage design with 'average' parameters, but using transistors of non-average parameters and circuit components with a few per cent tolerance. The measurements carried out on this amplifier, whose total stages were varied from two to seven confirm the good accuracy of the theory and design.

DOI:10.1049/ree.1967.0011

出版商:IERE    

年代:1967

数据来源: IET

摘要:

It is shown that there was a need to develop an equipment with special characteristics to meet the requirements of the current admixture of sidelobe suppression standards. Various configurations of interrogator are discussed and that adopted in the SECAR design is described in detail. The concept of ‘system beamwidth’ is introduced and discussed in relation to aerial design. Some of the design problems of the decoder are discussed and the application of the chosen technique is described

DOI:10.1049/ree.1967.0012

出版商:IERE    

年代:1967

数据来源: IET