首页期刊导航|Proceedings of the IEE, Part B. Electronic and communication engineering
期刊信息/Journal information
Proceedings of the IEE, Part B. Electronic and communication engineering
IEE
IEE
双月刊
0369-8890
Proceedings of the IEE, Part B. Electronic and communication engineering/Journal Proceedings of the IEE, Part B. Electronic and communication engineering
查看更多>>摘要：Aircraft aerials must satisfy severe environmental and aerodynamic conditions, besides meeting particular electrical requirements. These conditions are discussed in the paper, and solutions shown to some of the problems. In particular, aerials for h.f. and v.h.f. communication and v.h.f. navigation systems are described. Problems associated with aerial systems for automatic landing equipments are discussed, and a number of solutions are proposed. At this stage, virtually the beginning of multiple systems, it is improbable that the solutions proposed will be final. The basic problems of v.h.f. aerial siting have not been discussed fully, but references are given to other papers on this aspect of the subject. No attempt has been made to describe aerials for l.f. navigation aids, or centimetric aerial systems whose requirements can generally be considered apart from the aircraft.
查看更多>>摘要：The design, building and testing of an improved ground radome are described. The improvement in operation has been achieved by abandoning the usual arrangement of panels and bolts and adopting instead a homogeneous shell design. The new 26????????ft-diameter radome consists of low-density foam panels which are bonded by more foam of the same density, thereby resulting in a homogeneous structure. Tests at frequencies of 6 and 9Gc/s show an average reduction of 2% in field strength (0.2dB) for one-way transmission. Boresight errors of ???????±0.9mrad have been measured on a large aerial operating at 6Gc/s.
查看更多>>摘要：The standard method of aligning instrument landing systems is a visual one using a theodolite to observe an aircraft flying on the localizer and glide-path beams. This method is not altogether satisfactory because it is too much dependent upon good weather and results in a great deal of flying. An improved method has been developed which is based upon aerial photography. Since photographs are taken at about 1000ft above ground level, the weather requirement is reduced to conditions in which the cloud base exceeds this figure. Moreover, the flying time is only about one-fifth of that required by the visual method. The errors inherent in the photographic method of glide-path alignment are numerically the same as those for the visual method, but for localizer alignment an error-reducing process can be applied which reduces the region of uncertainty to about half that of the visual method. Special ground equipment has been developed for measuring essential parameters of the beams before flying begins. This reduces the probability that the equipment will fail to meet its alignment specification during a flight check.
查看更多>>摘要：Subscriber trunk dialling requires routing to be divorced from numbering. The paper discusses the various signalling problems which arise with register-translators. Basic principles are analysed rather than details of design, and a signalling philosophy is formulated as a basis of design for national and international networks. A main problem is the choice between the same or separate line equipment for the supervisory and number signalling; the paper details the merit of supervisory signalling by per-line equipment and number signalling by common-register equipment. End-to-end and link-by-link signalling, the signalling facilities to be given and the number signalling code all influence the signalling technique, and are analysed. Conclusions are given on the merits of link-by-link line signalling for flexibility of application, of end-to-end register number signalling for fast call set-up time and short post-dialling delays, and of fast coded self-checking multi-frequency signals for number transmission. The transmission features of line networks will have considerable influence on signalling-system design, particularly with end-to-end signalling for number transmission. Satisfactory design solutions are possible with limited end-to-end signalling. Speech-interpolation equipment (t.a.s.i.) applied to intercontinental circuits modifies the conclusions reached for the non-t.a.s.i. condition if account is to be taken of minimum degradation of the t.a.s.i. advantage, and the basic problem is the relative assessment of call set-up time and t.a.s.i.-advantage considerations.
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