Accession Number : ADA185257

Title :   Reduction of Collapsing Loss in Repair Displays.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Jarrett, B R ; Temes, C L

PDF Url : ADA185257

Report Date : 11 Sep 1987

Pagination or Media Count : 22

Abstract : A 'collapsing' loss occurs when the video output of a radar is displayed on a plan position indicator that has significantly poorer resolution than the radar. In this report we investigate the performance improvement gained by using peak detection/hold circuitry to obtain a pseudoresolution matched between the radar and the display, and we develop the appropriate relationship between peak detect/hold interval, spot size, and sweep speed. Analysis of the improvement to be gained through peak detection/holding was obtained by computer simulation, and additional data were obtained by experiment with an AN/SPS-10 radar and an AN/SPA-25 display located at the Chesapeake Bay Detachment of NRL. For linear detection, peak detection/holding appears to promise a considerable gain at significant values of collapsing ratio; the situation for square-law detection is less promising because the losses are lower. The question of whether almost-barely visible radar signals on a display (the case of most interest) correspond more closely to linear or square-law detection is left open; however, the experimental data and other researchers suggest it is normally linear. (Author)

Descriptors :   *DISPLAY SYSTEMS, *RADAR EQUIPMENT, *PLAN POSITION INDICATORS, MONTE CARLO METHOD, LOSSES, LINEAR SYSTEMS, SHIPBOARD, RESOLUTION, SIMULATION, REDUCTION, NONLINEAR SYSTEMS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE