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System for near real-time crustal deformation monitoring

  • US 4,170,776 A
  • Filed: 12/21/1977
  • Issued: 10/09/1979
  • Est. Priority Date: 12/21/1977
  • Status: Expired due to Term
First Claim
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1. In a system for monitoring crustal deformation using long-baseline radio interferometry, the method of receiving at two independent stations a radio signal of limited spectrum from a source at a known location is space, maintaining synchronized clocks at said station, time tagging the radio signal received at each station, transmitting the time-tagged radio signal received at each station to a convenient location for cross correlation using communication channels having a bandwidth sufficient for said limited spectrum, adjusting the transmission delay of one radio signal relative to the other to synchronize time tags prior to cross correlation, and estimating the interferometer delay or delay rate in order to derive baselines for near real-time crustal deformation monitoring.

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