Progress of DORIS Automatic Scaling

Abstract : A major component of the Digital Oblique Remote Ionospheric Sensing program (DORIS) is the development of an automatic oblique ionogram scaling algorithm. The nature of the variations that have been observed in oblique ionograms collected to data has required the use of adaptive signal processing and pattern recognition techniques in the development of this oblique ionogram scaling algorithm. An extensive data base of digital oblique ionograms will be required to develop, test, and verify the performance of the scaling algorithm. The continuing efforts in data collection and the associated parallel effort in the development of the oblique ionogram scaling algorithm is discussed in this report. Results obtained to date have lead to a modification of the initially proposed oblique ionogram scaling algorithm. These modifications, discussed in detail in the following section, have produced a more robust as well as a more computationally efficient oblique ionogram scaling algorithm.