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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Laser ranging and communications for LISA.

Andrew Sutton1, Kirk McKenzie, Brent Ware

  • 1Center for Gravitational Physics, The Australian National University, ACT 0200 Australia. andrew.sutton@anu.edu.au

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

A new Pseudo-Random Noise laser ranging system enables Time Delay Interferometry (TDI) for the Laser Interferometer Space Antenna (LISA) by precisely measuring time shifts. This system exceeds LISA

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Area of Science:

  • Astrophysics and Space Science
  • Optical Metrology
  • Laser Interferometry

Background:

  • The Laser Interferometer Space Antenna (LISA) mission requires advanced techniques to mitigate dominant laser frequency noise.
  • Time Delay Interferometry (TDI) is crucial for LISA, relying on precise optical phase measurements and sub-sample interpolation.
  • Accurate measurement of sub-sample time shifts is essential for effective TDI implementation in space-based interferometers.

Purpose of the Study:

  • To develop and validate a Pseudo-Random Noise (PRN) laser ranging system for LISA's TDI requirements.
  • To integrate optical communication capabilities meeting LISA's 20 kbps data rate specification.
  • To experimentally demonstrate the system's performance in phase measurement and ranging accuracy.

Main Methods:

  • Development of a PRN laser ranging system to measure sub-sample interpolation time shifts.
  • Integration of a 20 kbps optical communication system.
  • Experimental setup to test the combined phase measurement and ranging system.

Main Results:

  • Achieved an absolute range error of approximately 0.19 m root mean square (rms) with a 0.5 Hz signal bandwidth.
  • The demonstrated range error surpasses the stringent 1 m rms LISA specification.
  • Identified mutual interference between ranging signals and ranging code interaction with phase measurement as key limitations.

Conclusions:

  • The developed PRN laser ranging system is capable of meeting LISA's TDI operational needs.
  • The system's performance exceeds the mission's specified range error requirements.
  • Further research is needed to address interference and code interaction issues for optimal performance.