Detection Capability of Linear-and-Power Processor for Random Burst Signals of Unknown Location
Abstract
A random signal (if present) is located somewhere in a time interval characterized by a total of N search bins, along with uniform noise. The signal is burst-like and occupies a contiguous set of M bins, but the location of the M bins occupied by the signal is unknown. Also, the average signal level S in an occupied bin is arbitrary and unknown. The optimum (likelihood ratio) processor for this scenario is derived and simulated to determine its receiver operating characteristics. Practical approximations to this likelihood ratio processor lead to a class of suboptimum processors, called the linear-and-power (LAP) processors, that have a control parameter mu that can be varied for best signal detection capability. Simulations of various LAP processors reveal that near-optimum performance can be achieved by letting the control parameter mu tend to infinity; the resultant processor, called the Maximum processor, compares the maximum of all possible partial contiguous linear sums of the observations with a fixed threshold. For search size N = 1024, the loss in detectability of the Maximum processor relative to the unrealizable likelihood ratio processor is less than 0.1 dB over the complete range of values of M, the signal burst size.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 25, 1997
- Accession Number
- ADA640491
Entities
People
- Albert H. Nuttall
Organizations
- Naval Undersea Warfare Center