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TECHNOLOGY
 

HIVE technology is based on a patent-pending approach to motion capture using broadcast radio signals rather than sensors or optical markers 

The theory of the technology has been reviewed and validated by senior researchers in the motion capture and virtual reality field as well as by experts in electronics and RF design..  A proof-of-concept prototype has been developed and is functional in the lab with 1 millimeter resolution.

The system locates and tracks position using radio transmitters and receivers.  It does this by broadcasting a signal and determining the change in relative position between a selected transmitter and receiver. When only two antennas are used,  the relative positions of the antennas is determined as a straight line vector.  Through the use of multiple antennas, target position can be determined in additional geometries.  With antennas in known proximity within a model, additional positional can be inferred (roll, yaw, pitch)

Using simple inexpensive phase detection techniques we have demonstrated a linear accuracy of 1 millimeter tracking relative movement between  two antennas.

The basic principal is simple in concept and easy and inexpensive to implement using off-the-shelf components.

Given a signal between a transmitter and a receiver, changes in the phase of the wave between the two antennas is directly related to the change in distance between them. In order to achieve three dimensional tracking, multiple base antennas track individual targets and integrate their displacements into  x,y,z Cartesian coordinates within a given model space.

A typical configuration is four antennas arranged centrally which serve as the base reference transmitters.  This base of four transmitters is then complemented with any number of target antennas located on the positions to be tracked such as arms, legs, hoofs, fins,  hips, or  shoulders.

The transmission wave length is arbitrary and selected based on the requirements of the application.  Our prototype operates at 40 MHz.  Low wavelengths within the ISM bands are recommended but not required.  For example, the lower wavelengths are  best for aquatic applications, but higher wavelengths are better for high precision medical applications

The power requirements of the system are quite low since the range of the broadcast signal for most applications is only a few feet.  Battery powered self-contained systems can capture motion data for hours.  Modern flash drives can easily hold 12 hours of full-body motion capture.

An typical  motion capture system consists of a base unit containing the battery, flash storage CPU, transmitter and receiver with option direct tethering through USB or realtime remote capture using a wireless protocol such as Bluetooth.

The transmitter drives four base transmitting antennas located centrally to the person or animal being instrumented.  The receiver multiplexes any number of target antennas located on the limbs being tracked.
 

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© 2010 Human Instrumentation for Virtual Environments. Patents pending