Detection of Wandering Signals with an ALI Processor. Part II. Under-Resolution Case.
Abstract
The detection performance analysis for the ALI processor described in Part I is extended to the under-resolution regime in which the filters integrate for a time shorter than (or equal to) the signal coherence length. Formulas are presented which permit quantitative evaluation of the ALI's under-resolution performance. It is shown that for a fixed processor search band, B (the frequency region where one expects to find the signal if it is present at all), and for a specified signal coherence length and total processing time, the ALI's detection performance is insensitive to the degree of under-resolution committed by the processor. For the specific signal and processor parameters chosen for the Part I example, the ALI's under-resolution loss is smaller than its over-resolution loss over the useful range of detection probability. The under-resolution loss is approximately 2 dB relative to the ideal detector which is presumed to have knowledge of the signal's frequency and coherence length. The analysis and performance equations permit a comparison to be made between the overall performance of the suboptimum ALI processor and that which is attainable by the optimum processor. This performance comparison is the subject of a subsequent report. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 18, 1975
- Accession Number
- ADA016618
Entities
People
- Gene B. Goldstein
Organizations
- Technology Service Corporation