DOI:10.1049/ree.1969.0015

出版商:IERE    

年代:1969

数据来源: IET

摘要:

The whole field of civil work in sonar and underwater acoustics is reviewed, discussing in particular the problems of short-range highresolution sonar and sonar for fisheries, the influence of micro-electronics on sonar philosophy, the growing importance of the exploitation of nonlinear acoustic wave interactions in sonar applications, and propagation, transducers and arrays. Civil applications of underwater acoustics are growing rapidly, and recent developments will lead to sonars of very high performance becoming available at a cost little (if any) greater than that of existing simple commercial equipments.

DOI:10.1049/ree.1969.0016

出版商:IERE    

年代:1969

数据来源: IET

摘要:

The paper presents an account of the development of industrial process control by computer. Some of the control functions carried out by computer are described, with examples from a number of industrial processes.The special features of digital equipment for on-line industrial use are examined. In particular, reliability and fail-safe aspects are emphasized. Some of the methods used and problems encountered in system design and programming activities are illustrated.

DOI:10.1049/ree.1969.0017

出版商:IERE    

年代:1969

数据来源: IET

摘要:

In one form of rapid binary multiplier the number which is to be multiplied is presented serially to a controlled shift register. The multiplier must be presented in parallel to obtain the binary product. It controls the function of the register so that the product is generated serially from it. A variant of this type of multiplier is described in which the control logic is regarded as a recognizable sub-system. A new design for a divider is also suggested which is comparable with that of the multiplier and which uses some control logic which is common to both systems. The method is further extended to include the design of a square-rooter.

DOI:10.1049/ree.1969.0018

出版商:IERE    

年代:1969

数据来源: IET

摘要:

Alpha-numeric characters are used to identify radar targets on a p.p.i. display for air traffic control. Normally when using medium- to long-persistence phosphor on the display c.r.t., objectional smear results as alpha-numeric characters are moved. A technique for writing alphanumeric characters is described which reduces the effect of smear by use of interlace-written monoscope alpha-numerics and a mix of different coloured phosphors to enhance contrast of data.

DOI:10.1049/ree.1969.0019

出版商:IERE    

年代:1969

数据来源: IET

摘要:

A unified approach to linear circuit analysis is described which apart from its simplicity reduces the time required for circuit analysis on an undergraduate electronics course. Representation of a network by its indefinite admittance matrix is well established and for a w-node network would result in an×nmatrix. Reduction of this matrix to a 2 × 2 matrix is described and an easy to memorize procedure in terms of the input and output nodes is given.

DOI:10.1049/ree.1969.0020

出版商:IERE    

年代:1969

数据来源: IET

摘要:

A multi-beam antenna known as the Maxson antenna is described. It consists of a linear array of elements fed in a serial fashion by a matrix of waveguide directional couplers. The antenna designed produced two 1° beams and operated over a 10% bandwidth at C-band. The feeder coupling matrix was designed to produce no interaction between beams. Limits on orthogonal and non-orthogonal beam-shapes and beam-positions are derived. Applications of this type of antenna are discussed.

DOI:10.1049/ree.1969.0021

出版商:IERE    

年代:1969

数据来源: IET

DOI:10.1049/ree.1969.0022

出版商:IERE    

年代:1969

数据来源: IET