Project deliverable Open Access

WWV/H Characterization Signal

Kristina Collins

Project member(s)
Matthew Deutch; Dean Okayama; Dean Takamatsu; William Yates; Glenn Nelson; Jim Spicer; Chris Fujita; Nathaniel Frissell; Phil Karn; John Gibbons; Dave Swartz
Research group(s)
David Kazdan; Ethan Miller; Philip J. Erickson; William Liles
Supervisor(s)
Mike Lombardi

A signal designed to characterize the signals at stations WWV and WWVH. This signal was designed by members of the WWV/H Scientific Modulation Working Group for the test signal block at Minute 8 (WWV) and 44 (WWVH). 

Files in this upload:

  • WWV_Test_Signal_Generator.m: MATLAB script to synthesize signal. 
  • voiceintro.wav: A voice recording at the beginning of the signal, which states: "What follows is a scientific modulation test. For more information, visit hamsci.org/wwv."
  • test.csv: A .CSV of the test signal to support use with an arbitrary waveform generator.
  • test.wav: A playable WAV file of the signal.
  • testsignal.png: Time domain plot.

The signal test.wav consists of the following segments:

  • 10 second voice announcement. 
  • Gaussian white noise (2 seconds). 
  • One second blank time. 
  • Phase-coherent 2, 3, 4, 5 kHz sine waves that drop down by 3 dB 9 times, 10 seconds total. 
  • One second blank time. 
  • An eight-second sequence consisting of linear up-chirps and down-chirps, generated with https://www.mathworks.com/help/signal/ref/chirp.html: long is 5 kHz over 1 second (TBW = 5,000), short is 5 kHz over 0.05 seconds (TBW = 250).  To wit: 3 short up, 3 short down, .5 seconds blank, 3 long up, 3 long down. 100 ms between chirps and at the end of each sub-sequence. 
  • 2 seconds blank time.
  • A one-cycle burst at 2.5 kHz frequency, for time domain measurement, repeated 5 times over the course of 1 second; then the same for 5 kHz.
  • One second blank time. 
  • Repeated 2 seconds of Gaussian white noise for synchronization. Same sequence.
  • 3 seconds blank time.

____________________________________________________________

Update, 26 October 2021: A new file, test_without_voice.csv, has been added. This signal can be produced by commenting out lines 123-126 in the MATLAB code. 
NB: Do not open the .csv files in Excel before uploading them to the arbitrary waveform generator, or they will become unusable. Instead, upload them directly without opening them in Excel. 

Files (56.5 MB)
Name Size
test.csv
md5:e7186f4059895c71f512bae330a05ce6
30.5 MB Download
test.wav
md5:420ed89831a383e8134d62ed4e00238e
4.0 MB Download
test_without_voice.csv
md5:d569cb1ad1c465e4cda6319ef8928dae
20.9 MB Download
testsignal.png
md5:016db7474c3bbd14ade83e76880b2455
80.6 kB Download
voiceintro.wav
md5:682a37f708192fada94c9854373198b5
929.7 kB Download
WWV_Test_Signal_Generator.m
md5:75543be4b70d8f1937ee8e986d089c99
4.9 kB Download
1,593
1,866
views
downloads
All versions This version
Views 1,593436
Downloads 1,866452
Data volume 40.0 GB9.8 GB
Unique views 1,332396
Unique downloads 1,117294

Share

Cite as