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Published August 11, 2021 | Version v1
Project deliverable Open

WWV/H Characterization Signal

  • 1. Case Western Reserve University
  • 1. National Institute of Standards and Technology
  • 2. Case Western Reserve University
  • 3. MIT Haystack Observatory
  • 4. WWV
  • 5. WWVH
  • 6. HamSCI
  • 7. University of Scranton
  • 8. ARDC
  • 9. WW0WWV

Description

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.

Files

test.csv

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