AWESOME receiver system quick-look Narrowband Summary Charts

2021-03-02 17:39:48Z

The narrowband summary chart shows amplitude and
phase. The rows represent each transmitter-receiver path, as
labeled in the top left corner. The four columns represent channel
0 amplitude (NS), channel 0 phase(NS), channel 1 amplitude(EW), and channel 0
phase(EW), in that order, over the 24-hour period. The colors simply
indicate when software reboots took place. The title of the chart indicates the name of the
station and the year-month-day of the observation.

These charts are a quick and easy
way to evaluate the operation of the receiver and the noise
environment, but more detailed analysis requires downloading the actual data.

These summary charts are derived from the Narrowband data which are
the amplitudes and phase of specific frequencies, usually
corresponding to VLF transmitters that are used for communications
and navigation. Sampling rate is usually either 1 Hz or 50 Hz. They
are a useful diagnostic of the ionosphere. Most of these
transmitters use minimum shift keying (MSK) modulation. The
recording software extracts the amplitude, and the phase is
calculated by demodulating the MSK modulation.

DATA USAGE POLICY The data in the WALDO database have been collected by Stanford University, the Georgia Institute of Technology, and the University of Colorado Denver. Funding has been provided by the United States government under various basic science research grants over many years. To maximize the benefit of those investments, WALDO data are released without restriction, and can be freely analyzed or published. The curators of WALDO are Morris Cohen (Georgia Tech) and Mark Golkowski (CU-Denver). We request that the following acknowledgement be added in any publication using data from WALDO "VLF data are provided by the WALDO database (https://waldo.world), operated jointly by the Georgia Institute of Technology, and the University of Colorado Denver, using data collected from those institutions as well as Stanford University, and has been supported by various US government grants from the NSF, NASA, and the Department of Defense." If extensive amounts of WALDO data are used in a publication, the curators request, but do not require, to be contacted to discuss the possibility of joint authorship, with the WALDO curators providing help analyzing and interpreting the large dataset.

spase://GBO/DisplayData/AWESOME/VLF/Narrowband/P1D

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