http://iet.metastore.ingenta.com
1887

The design of automatic-gain-control systems for auto-tracking radar receivers

The design of automatic-gain-control systems for auto-tracking radar receivers

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Proceedings of the IEE - Part C: Monographs — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A survey is presented of the automatic-gain-control requirements for target-tracking radars of the conical-scanning type. A simple analysis of linear closed-loop a.g.c. systems is given, from which the required performance can be related to circuit parameters. Practical considerations regarding methods of controlling i.f. amplifier gain, number and position of controlled stages, and means of extracting the conicalscan modulation are briefly reviewed.The frequency-response characteristics of the a.g.c. loop, as governed by the conflicting requirements of stability, speed of response, and faithful reproduction of the scan modulation, are discussed from the Bode and Nyquist-diagram points of view. A simple graphical method of allowing for the sampling process in a pulsed radar system is given.The design methods are illustrated by a description of the development of an a.g.c. system for a particular naval fire-control radar. This system employs suppressor-grid i.f. amplifier control, the control voltage being developed by a special d.c. amplifier having an exponential characteristic obtained by negative feedback via a series of biased diodes. A filter embodying a twin-T network is employed to achieve maximum speed of response consistentAwith minimum modulation phase shift.Target-tracking trials with this system demonstrated that a significant increase in aiming error can be produced by fast-acting automatic gain control unless the receiver noise level is sufficient to keep the loop closed during deep fades.

References

    1. 1)
      • J. Croney . A Simple Logarithmic Receiver. Proceedings of the Institute of Radio Engineers
    2. 2)
      • Rozenstein, S.: `Design of a Logarithmic Receiver', Paper No. 1733 R, Proceedings I.E.E., January 1955, 102 B, p. 69.
    3. 3)
      • Oliver, B.M.: `Automatic Volume Control as a Feedback Problem', Proceedings of the Institute of Radio Engineers, April 1948.
    4. 4)
      • S.N. van Voorhis . (1948) Microwave Receivers.
    5. 5)
      • H.W. Bode . (1945) Network Analysis and Feedback—Amplifier Design.
    6. 6)
      • W. Hurewicz . (1947) Theory of Servo-Mechanisms.
    7. 7)
      • L.A. MacColl . (1945) Fundamental Theory of Servomechanisms.
    8. 8)
      • Barker, R.H.: `The Pulse Transfer Function and its application to Sampling Servo Systems', Monograph No. 43, Proceedings I.E.E., July 1952, 99, p. 302, Part IV.
    9. 9)
      • McDonnel, D., Perkinsl, W.R.: `The Stability and Time Response of Fast-Operating Closed-Loop Pulsed Radar Circuits', Monograph No. 121 R, Proceedings I.E.E., March 1955, 102C, p. 191.
    10. 10)
      • W.K. Linvill . Sampled-Data Control Systems studied through Comparison of Sampling with Amplitude Modulation. Transactions of the American I.E.E.
    11. 11)
      • Burt, E.G.C., Lange, O.H.: `Function Generators based on Linear Interpolation with Applications to Analogue Computing', Monograph No. 137 M, Proceedings I.E.E., June 1955, 103 C, p. 51.
http://iet.metastore.ingenta.com/content/journals/10.1049/pi-c.1958.0015
Loading

Related content

content/journals/10.1049/pi-c.1958.0015
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address