On the accuracy and interpretation of Dynasonde virtual height measurements

Wright, J. W.; Paul, Adolf K.; Pitteway, M. L. V.

doi:10.1029/rs015i003p00617

Cited by 14 publications

(6 citation statements)

References 21 publications

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“…Meanwhile, a final dimension Z is introduced by small (•-0.1%) offsets of radio frequency on some of the pulses. This feature establishes the stationary-phase group range R', and completes the orthogonal spatial coordinates XL, ¾L, ZL of an echo, such that R'2= XL 2 + YL 2 + ZL 2 for (virtual) echolocation [Paul et al, 1974;Wright et al, 1980]. Information on the polarization P of the echoes is also obtained since the receiving dipoles are oriented orthogonally in pairs.…”

Section: Information Contentmentioning

confidence: 85%

A new data acquisition concept for digital ionosondes: Phase‐based echo recognition and real‐time parameter estimation

Wright¹,

Pitteway²

1999

Radio Science

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Abstract. The problem of identifying echoes in digital ionosonde observations is discussed, starting with an off-line simulation of the procedure long used in real time by the dynasonde. In that method, echoes are defined as amplitude-modulus peaks from rapid (10-1as) sampling of receiver quadrature outputs; coincidence of peak time among a small number (4-8) of repeated pulses has served well to reject impulsive noise while deciding the complex-amplitude samples to be retained for off-line analyses. This paper presents a new method of echo recognition dependent on all of the phase information contained in the same rapid sampling. No change is made in basic sounding function, but conversion to physical parameters is done first, for all 10-1as samples; the consistency of these parameters in five dimensions over four or more samples defines an echo, or at least a partial "glint." In an example recording, the new method recognizes about 60% more echoes and glints, giving better trace continuity than the earlier method. Measurement resolution among proximate echoing regions is improved. Weighted means of the physical parameters within their defining samples yields better accuracy. Almost incidentally, these results would be available immediately in a real-time implementation of the method.

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Section: Information Contentmentioning

confidence: 85%

A new data acquisition concept for digital ionosondes: Phase‐based echo recognition and real‐time parameter estimation

Wright¹,

Pitteway²

1999

Radio Science

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“…The Dynasonde is a fully digital research ionosonde designed to measure accurately all of the significant properties of ionospherically reflected echoes [Wright, 1969;Wright and Pitteway, 1979;Wright et al, 1980Wright et al, , 1988. The classical ionogram variables of "virtual height" and radio frequency are measured or controlled with precise timing and high-resolution frequency synthesis.…”

Section: Methodsmentioning

confidence: 99%

Ionogram inversion for a tilted ionosphere

Wright¹

1990

Radio Science

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Digital ionosondes such as the Dynasonde disclose that the ionosphere is seldom horizontal even when it is plane stratified to a good approximation. The local magnetic dip does not then determine correctly the radiowave propagation angle for inversion of the ionogram to a plasma density profile. The measured echo direction of arrival can be used together with the known dip for an improved propagation angle. The effects are small for simple one-parameter laminae but become important when differential (ordinary, extraordinary) retardations are used to aid correction for "valley" and "starting" ambiguities. The resulting profile describes the plasma distribution along the direction of observation, rather than the vertical; it thus conveys information about horizontal gradients. Observations suggest that advances in inversion methods may be practicable for application to modern ionosonde recordings, by which local lateral structure can be described in greater detail.

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“…There is a long-standing discussion of the physics of high-frequency radio wave scattering from the ionospheric plasma and the optimal way to process the measurements of the scattered radio waves (Wright and Pitteway, 1979;Wright et al, 1980;Sedgemore et al, 1998;Reinisch et al, 2005;Bertoni et al, 2006;Zabotin et al, 2006;Reinisch et al, 2009;Paznukhov et al, 2012). A fundamental strategy of the Dynasonde technique is the use of individual echoes, detected without average the data from multiple transmitted pulses that is frequently incorporated into other techniques.…”

Section: Microphysics Of High Frequency Radio Wave Scatteringmentioning

confidence: 99%

Science Goals for a High-Frequency Radar and Radio Imaging Array

Isham,

Bullett,

Gustavsson

et al. 2023

Bulletin of the AAS

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We are developing a 2 to 25 MHz, medium and high frequency (MF/HF) antenna array, for radar and radio imaging of the ionosphere. This white paper contains a discussion of the science goals for the array.Science goals include the study of space weather, ionospheric structure and dynamics, meteors, lightning, radio propagation, and plasma physics. Radio imaging is ideal for the study of stimulated ionospheric radio emissions, such as those induced by the Arecibo Observatory high-power HF radio transmitter, which is likely to be restored to operation in the near future.The main array will consist of 64 active crossed antenna elements within a 400-meter-diameter area. Relocatable cable-less antenna elements will also be included, with phase maintained through the use of GPS-disciplined rubidium clocks. These elements may be used independently, or together with the main array for improved imaging resolution.The proposed location is at the site of the former U.S. Air Force Ramey Solar Observatory (RSO), in Aguadilla in northwest Puerto Rico. Radar imaging will be done in collaboration with the University of Colorado and NOAA HF radar system located at the USGS San Juan Observatory in Cayey, 110 km from Aguadilla.A technical description of the array is included in a companion white paper, Technical Design of a High-Frequency Antenna Array for Radar and Radio Imaging of the Ionosphere.

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On the accuracy and interpretation of Dynasonde virtual height measurements

Cited by 14 publications

References 21 publications

A new data acquisition concept for digital ionosondes: Phase‐based echo recognition and real‐time parameter estimation

A new data acquisition concept for digital ionosondes: Phase‐based echo recognition and real‐time parameter estimation

Ionogram inversion for a tilted ionosphere

Science Goals for a High-Frequency Radar and Radio Imaging Array

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