Accession Number:

ADA099988

Title:

Performance Comparison of Cell Averaging and 'Greatest-of' Constant False Alarm Rate (CFAR) Methods.

Descriptive Note:

Technical rept.,

Corporate Author:

ARMY MISSILE COMMAND REDSTONE ARSENAL AL ADVANCED SENSORS DIRECTORATE

Personal Author(s):

Report Date:

1981-02-01

Pagination or Media Count:

146.0

Abstract:

Radar system detection procedures involve the comparison of a received signal to a threshold value. A fixed threshold is not successful in controlling the false alarms because of changing interference conditions such as noise, clutter, and jammers. Consequently, an adaptive threshold is frequently used to establish a constant false alarm rate CFAR. The maximum likelihood cell averaging approach is one of the adaptive procedures. The cell averaging CFAR is of major importance because it has superior performance in homogeneous Gaussian noise. Unfortunately, nonhomogeneous interference such as that produced at chaff and clutter edges will degrade the performance of the cell averaging CFAR. The search for a CFAR method which can control the false alarms resulting from clutter edges has produced a modification to the cell averaging approach which is known as the greatest-of CFAR. This effort compared the performance of the cell averaging and greatest-of CFAR methods for different processor configurations. The performance comparison was made based on probabilities of false alarm and probabilities of detection determined by a Monte Carlo simulation. -of, and logCFAR, a performance comparison of the cell averaging and greatest-of CFAR techniques, and a summary of the results with recommendations for future effort. The performance of the two CFAR methods is independent of the detector. The cell averaging gives better detection performance in an interfering target environment, while the greatest-of provides better false alarm regulation in a nonhomogeneous interference environment. Author

Subject Categories:

  • Statistics and Probability
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE