Accession Number : ADD012146

Title :   Environmental Mapping System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Cantrell,Ben H

Report Date : 26 Nov 1985

Pagination or Media Count : 16

Abstract : A circuit which detects environmental sources of echos received by a pulse-echo system such as radar and classifies the sources of the echo at each range resolution cell as either short-pulse interference, ran clutter or jamming, distributed land clutter, an isolated target or thermal noise. The circuit implements on the screen of a cathode ray tube a digital map of a selected echo source type by modulating the electron beam intensity with a binary digit (o or 1) at each increment of the sweep corresponding to a range resolution cell. The circuit utilizes a pulse-to-pulse noncoherent subtraction to remove correlated echoes, leaving only uncorrelated type echos. Short-pulse interference is then detected and the uncorrelated echo component is compared to thermal noise to determine if land clutter is determined from the uncorrelated echo component, and all correlated targets and land clutter and isolated targets by the following procedure: the isolated targets are required to have uncorrelated echoes on each side of them in range. Finally, if no detection of any of these types is made, thermal noise is declared.

Descriptors :   *PATENTS, *RADAR CLUTTER, *SIGNAL PROCESSING, *DIGITAL MAPS, GROUND CLUTTER, ENVIRONMENTAL ENGINEERING, NOISE JAMMING, SHORT PULSES, TARGET DETECTION, INTERFERENCE, DIGITAL SYSTEMS, CATHODE RAY TUBES, SOURCES, INCOHERENCE, DETECTION, RESOLUTION, ISOLATION, DISTRIBUTION, MODULATION, NOISE, PULSES, JAMMING, TARGETS, CELLS, MAPPING, INTENSITY, ECHOES

Subject Categories : Cybernetics
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE