Effect of Background Estimation on the Sensitivity of Sonar or Radar Receivers
NAVAL ORDNANCE LAB WHITE OAK MD
Pagination or Media Count:
Radar and sonar receivers usually operate in a noise background of unknown level. In order to maintain a constant false alarm rate, they often include circuits to estimate this background level. A technique is derived for determining the performance loss caused by background estimation. The loss is evaluated for several systems with Gaussian statistics and for narrow-band systems with square law, envelope, and logarithmic detectors. The loss depends on the type of system, the false alarm probability desired, and the size of the sample used in the background estimation.