Reduction of Collapsing Loss in Repair Displays.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 11, 1987
- Accession Number
- ADA185257
Entities
People
- B. R. Jarrett
- C. L. Temes
Organizations
- United States Naval Research Laboratory