Quality Control of True Height Profiles Obtained Automatically from Digital Ionograms.
Abstract
The automatic scaling and determination of true height profiles from digital vertical ionograms are key elements in the ever increasing use of digital ionosondes for real time HF propagation prediction purposes and for the accumulation of valuable computer accessible scientific data. The N(h) profiles passed on to the propagation prediction programs or to scientific archives must be reliable, and if not, an indiction to this effect must be passed on instead. This procedure must be made automatic, in view of the large amounts of data and short time scales involved. In general, it is extremely difficult to tell that a profile is incorrect simply by looking at it in conjunction with the ionogram, since the relationship between the two is very complex. This report describes five simple techniques which can be used automatically to indicate the reliability of the deduced N(h) profile. A study of about 1000 auto-scaled Digisonde ionograms from five North American stations has shown that a profile may safely be rejected as unreliable if several of the techniques separately indicate that it is unreliable.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1982
- Accession Number
- ADA171328
Entities
People
- Leo F. Mcnamara