Progress on Artist Improvements

Tang, Jane; Gamache, Robert R.; Reinisch, B. W.

doi:10.21236/ada219799

Cited by 3 publications

(2 citation statements)

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“…As a result, the polynomial method has become a powerful tool with which to analyze ionograms. (Tang et al, 1988) and the POLynomial ANalysis (POLAN) program (Titheridge, 1985). The ARTIST is a routine specially designed for reducing the ionograms obtained from Lowell's digisondes, while the POLAN is a general program for analyzing the ionograms obtained from ionosondes.…”

Section: Integral Equation Methodsmentioning

confidence: 99%

A Study of the True Height Analysis Methods

Liu¹,

Berkey²,

Wu³

1992

Terr. Atmos. Ocean. Sci.

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In this paper, a computer routine, POLAN, was used to convert an ionogram recorded at Cleary, Alaska to many electron density true height profiles by specifying various values of MODE, START and VALLEY parameters. These profiles are then compared with that measured by the Chatanika incoherent scatter radar. This compari son allows us to evaluate the difference of the electron density profiles respectively derived by using ionospheric sounding and incoherent backscatter techniques and to investigate the existing true height analysis methods.

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Section: Integral Equation Methodsmentioning

confidence: 99%

A Study of the True Height Analysis Methods

Liu¹,

Berkey²,

Wu³

1992

Terr. Atmos. Ocean. Sci.

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“…The first three steps of interpretation (see Figure 5) are analogous to the ARTIST scheme [Tang et al, 1988]. Then, the upward inclined curve segments close to the F2 center are used as the starting landmarks for retracing F2 layer data, unlike the F2 center itself used by ARTIST.…”

Section: Scaling Critical Frequencies Of the F2 Layermentioning

confidence: 99%

Feedback neural networks for ARTIST ionogram processing

Galkin¹,

Reinisch²,

Ososkov³

et al. 1996

Radio Science

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Modern pattern recognition techniques are applied to achieve high quality automatic processing of Digisonde ionograms. An artificial neural network (ANN) was found to be a promising technique for ionospheric echo tracing. A modified rotor model was tested to construct the Hopfield ANN with the mean field theory updating scheme. Tests of the models against various ionospheric data showed that the modified rotor model gives good results where conventional tracing techniques have difficulties. Use of the ANN made it possible to implement a robust scheme of trace interpretation that considers local trace inclination angles available after ANN completes tracing. The interpretation scheme features a new algorithm for ƒ0F1 identification that estimates an α angle for the trace segments in the vicinity of the critical frequency ƒ0F1. First results from off‐line tests suggest the potential of implementing new operational autoscaling software in the worldwide Digisonde network.

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