Articles

Acousto-optic system for automatic identification and decoding of digitally modulated signals

[+] Author Affiliations
Matthew Hicks, Christopher D. Reeve

University of Plymouth, School of Electronic Communication and Electrical Engineering, Drake Circus, Plymouth, PL4?8AA, United Kingdom

Opt. Eng. 37(3), 931-941 (Mar 01, 1998). doi:10.1117/1.601927
History: Received June 3, 1997; Revised July 30, 1997; Accepted Aug. 10, 1997
Text Size: A A A

Abstract

A simple acousto-optic system is described that is capable of demodulating frequency- and phase-modulated signals using a bicell photodetector. A summary of an analytical study of the system is provided, describing its main performance characteristics. Results from a Mathcad model of the system are presented showing that, by taking the sum and difference of the outputs from the two bicell elements, it is possible to identify and demodulate a wide range of different types of modulation without any a priori information. Thus the technique is well suited for surveillance receiver and electronic support measures (ESM) applications. In particular, it is shown that biphase shift keying (BPSK), quaternary phase shift keying (QPSK), offset-keyed QPSK, differential QPSK, continuous phase frequency shift keying (FSK) [including minimum shift keying (MSK)], and ordinary FSK all give unique and easily identifiable signatures. Experimental results are presented, which are in good agreement with both theoretical and modeled results. © 1998 Society of Photo-Optical Instrumentation Engineers.

© 1998 Society of Photo-Optical Instrumentation Engineers

Citation

Matthew Hicks and Christopher D. Reeve
"Acousto-optic system for automatic identification and decoding of digitally modulated signals", Opt. Eng. 37(3), 931-941 (Mar 01, 1998). ; http://dx.doi.org/10.1117/1.601927


Figures

Tables

References

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement


  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.