摘要:

For nearly forty years radar displays in small and medium systems have been used by dark-adapted, dedicated radar operators or observers. Recently there has been a growing need for displays to be used in a ‘glance’ mode, often under high-ambient-light conditions. The paper discusses the implications and outcome of such usage with particular reference to small-target detection in sea-clutter conditions

DOI:10.1049/ij-ecs.1979.0042

出版商:IEE    

年代:1979

数据来源: IET

摘要:

This paper gives a new method for designing an arbitrary linear resistive multiport based on simple modules. The new approach presents two distinctive features which are not presently shared with other related design procedures. First, it allows voltage-controlled as well as current-controlled ports. Secondly, every port may be grounded or floating, i.e. it is possible to design either (n+ l)-terminal orn-port networks

DOI:10.1049/ij-ecs.1979.0043

出版商:IEE    

年代:1979

数据来源: IET

摘要:

Implementation of rectangular transforms (r.t.) in modular arithmetic and computation of number theoretic transforms through Winograd's algorithm are discussed. The computational effort of various algorithms to implement real convolution is investigated. Considering the signal/noise ratio performance and hardware complexity, it is shown that the r.t.s are best suited for digital-filtering applications with word lengths less than about 16 bits. Finally, r.t.s are shown to be the most amenable to the application of the Chinese remainder theorem for increasing the dynamic range

DOI:10.1049/ij-ecs.1979.0044

出版商:IEE    

年代:1979

数据来源: IET

摘要:

This paper represents a sequel to an earlier paper, where a unified study of the applications of Volterra functional series to nonlinear analysis is presented. The same philosophy is followed here, giving special emphasis on frequency-domain results which either have not been published before, or where rigour had been lacking. Some of the results presented include generalisations or rigorous formalisations of wellknown special cases. Explicit and recursive formulas for obtainingnth-order transfer functions of composite nonlinear systems are presented. A recursive method for obtaining thenth-order output of a nonlinear circuit by solving a linear circuitntimes is derived. Each time different input sources arc used. Recursive formulas for obtaining thenth-order transfer functions of nonlinear circuits are then generated. These results are used to obtain formulas fornth-order transfer functions of cascade systems, as well as inverse systems. Methods for synthesising nonlinear circuits and inverse systems via feedback configurations are given. Finally, the general structures of transfer functions for a large class of nonlinear systems are also derived.

DOI:10.1049/ij-ecs.1979.0045

出版商:IEE    

年代:1979

数据来源: IET

摘要:

Recently, two reduced-state detection processes for distorted digital signals have been proposed. These can achieve near-maximum-likehood performance without the computational difficulties associated with the Viterbi algorithm. The paper studies the effect of the merging of stored vectors on these processes and explains how and why this can result in a deterioration in performance. Two modifications to avoid merging are given.

DOI:10.1049/ij-ecs.1979.0046

出版商:IEE    

年代:1979

数据来源: IET