Accession Number : ADA188465

Title :   Wide-Dynamic-Range Analog-to-Digital Conversion for HFDF.

Descriptive Note : Technical rept. May-Nov 86,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : McKnight, W H ; Kaplan, D J ; Speiser, J M ; Jones, T O

PDF Url : ADA188465

Report Date : Nov 1986

Pagination or Media Count : 36

Abstract : Progress is reported in the development of the linear predictive coding/high-speed photoconductor sampling switch concept for wide-dynamic-range digitization of wideband HFDF data, using a synchronously driven laser/fiber-optic system. Development activity reported is in the areas of: (1) simulation, modeling, analysis, and demonstration of noise/jammer approach, using linear predictive coding for speech data; (2) assessment of a finite-impulse-response digital filter approach, using a tapped delay line with fixed tap weights and an over-sampled signal to accomplish linear prediction with arbitrary accuracy; (3) analysis of the physical properties of photoconductor switches and sample/track-and-hold circuit parameters as they limit the data word accuracy in an A/D converter application; and (4) current and future development activities. Keywords include: High-frequency direction finder (HFDF), Lasers, Fiber optics, Switches, Linear predictive coding, High-speed photoconductors, Wide-dynamic-range digitization, Noise/jammer cancellation, and Modems.

Descriptors :   *CONVERTERS, *DIRECTION FINDING, *FIBER OPTICS, *MODEMS, ACCURACY, CANCELLATION, CODING, DATA MANAGEMENT, DELAY LINES, HIGH FREQUENCY, LASERS, LINEAR SYSTEMS, NOISE, NOISE JAMMERS, PHOTOCONDUCTORS, PHYSICAL PROPERTIES, PREDICTIONS, SIMULATION, SPEECH, SWITCHES, TAPS, WORDS(LANGUAGE)

Subject Categories : Target Direction, Range and Position Finding
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE