Accession Number : ADD017968

Title :   Digital Circuit for Decoding Encoded Doppler Data.

Descriptive Note : Patent, Filed 7 Apr 95, patented 7 Nov 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Houlberg, Christian L

Report Date : 07 Nov 1995

Pagination or Media Count : 27

Abstract : An electronics circuit receives a sub frame of encoded doppler data having Groups One through N of data words with the first three words of Group N comprising a frame sync signal which is compared to a reference signal with a sync pulse being generated whenever the signals are identical. This sync pulse is supplied to three counters to load each counter with a predetermined count. The first counter counts the number of words in each Group; the second counter counts the number of Groups in a sub frame and the third counter indicates the location of Automatic Gain Control and Word Width data within the sub frame. Encoded within each group of a Sub Frame are one or mone clusters of doppler words with a fourth counter indicating the location of these clusters of doppler words. A word decoder circuit in response to a gain signal and a word width data signal decodes each word of each group of the sub frame having doppler data to extract the doppler data.

Descriptors :   *DATA TRANSMISSION SYSTEMS, *CIRCUITS, *DECODERS, *PATENTS, GUIDED MISSILES, DIGITAL SYSTEMS, DATA MANAGEMENT, PULSE MODULATION, AUTOMATIC GAIN CONTROL, DECODING, DOPPLER NAVIGATION

Subject Categories : Electrical and Electronic Equipment
      Cybernetics
      Guided Missiles
      Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE