Accession Number : ADD014048

Title :   Land Mass Blanking Apparatus.

Descriptive Note : Patent, Filed 20 Jun 75, patented 28 Feb 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Urkowitz, Harry ; Perry, Richard P

Report Date : 28 Feb 1989

Pagination or Media Count : 4

Abstract : Conventionally, a shift register receives radar video return signals and gates them into a signal processing and detecting means. Since continuous, large cross-section echoes such as those derived from land masses may saturate the processor, the present apparatus is set to blank such land masses. For this purpose, the shift register capacity is made coextensive with the continuous land mass echo and further, the register is provided with a series of taps spaced one from the other a distance representing selected increments of the range extent being tested. Each tap output is applied to an amplitude-thresholder to pass only higher strength echoes to a counter. Count-responsive means operating as a counter threshold control the radar signal processor to the extent that when the total count exceeds a certain number a processor shut-off signal is generated. When the count goes below the certain number a turn-on signal is generated. Thus, the processor is inactive when the count receives a predetermined total indicator of the large land mass to be blanked. Patents. (JHD)

Descriptors :   *PATENTS, *RADAR SIGNALS, *SHIFT REGISTERS, *SIGNAL PROCESSING, CAPACITY(QUANTITY), RADAR CROSS SECTIONS, ECHOES, LAND AREAS, PROCESSING EQUIPMENT, VIDEO SIGNALS, RADAR REFLECTIONS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE