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Related Experiment Videos

Dynamic response of electromagnetic spatial displacement trackers.

B D Adelstein1, E R Johnston, S R Ellis

  • 1NASA Ames Research Center, Moffett Field, CA 94035, USA.

Presence (Cambridge, Mass.)
|July 1, 1996
PubMed
Summary

System latency in virtual environments (VE) is a major challenge. This study introduces a novel testbed to accurately measure the dynamic response of head and hand position trackers, crucial for improving VE performance.

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Area of Science:

  • Human-computer interaction
  • Virtual reality technology
  • Sensor dynamics and performance analysis

Background:

  • System latency, the delay between human input and display feedback, is a critical limitation in current virtual environment (VE) technology.
  • Spatial displacement trackers, essential for monitoring user movement (head and hands), inherently contribute to this overall system latency due to their dynamic response.

Purpose of the Study:

  • To develop and describe a specialized testbed and methodology for precisely measuring the dynamic response of virtual environment sensors.
  • To isolate and quantify the contributions of tracker transduction, processing, data transfer, and host computer software to system latency.
  • To compare the latency, gain, and noise characteristics of commercially available electromagnetic trackers.

Main Methods:

Keywords:
NASA Center ARCNASA Discipline Space Human Factors

Related Experiment Videos

  • A motorized rotary swing arm was utilized to sinusoidally displace virtual environment (VE) sensors across a range of frequencies relevant to human motion.
  • Actual swing arm angles and reported sensor data were collected and precisely time-stamped during sinusoidal displacement tests.
  • A calibrated time-stamping technique was employed to differentiate between sensor internal latencies and external data transfer/software latencies.

Main Results:

  • The developed testbed successfully separated tracker internal latencies from data transfer and host computer software execution latencies.
  • The study facilitated a comparative analysis of latency, gain, and noise performance between two leading electromagnetic trackers: Flock of Birds (Ascension Technology Corp.) and Fastrak (Polhemus Inc.).

Conclusions:

  • The described testbed provides a robust method for accurately characterizing the dynamic response of VE sensors, a key factor in reducing system latency.
  • Understanding and quantifying individual component latencies is crucial for optimizing overall virtual environment system performance and user experience.