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HIVE HARDWARE CONFIGURATIONS

    It is expected that most licensees will want to 'tune' their hardware configuration to best address their specific  problem space.  This document outlines the fundamental hardware components of the HIVE technology and the wide range of design options.

    The basic elements of the HIVE motion capture system consists of a transmitter, a receiver, 2 antenna switch banks, one for the receiving antennas and one for the transmitting antennas, a phase comparator, a microcomputer and data storage.

CONFIGURABLE PARAMETERS:

  • Number of tracked locations:  this is limited only by processor speed
    • Antenna locations are read serially, with at least 4 transmitter locations read and stored for each receiver antenna polling stage, so the limit to the number of antennas is a function of the time it takes to poll an individual receiver and the overall polling time desired.  For example a 20 millisecond poll time and 10 receiving antennas gives a 2 milliseconds processing budget for each receiver or .5 milliseconds processing time for each of 4 transmitters.  Very high numbers of receivers are possible with high speed CPU's, parallel architectures and multi-threading.
  • Polling interval:  this is limited only by processor speed.
    • For very high-speed polling, in the microsecond range, we need to factor in signal settling latencies, speed of storage access, etc.  Strictly price/performance trade-offs.
  • Storage solutions
  • Local Flash
    • The size of local storage is a function of the granularity of the capture data and the desired length of capture.  A single data element consists of a Transmitter ID, a time and 4 displacements requiring 8 bytes of storage.  This means that a 16 GB flash drive holds enough space for 2,000,000,000 entries.
  • Bluetooth
    • Bluetooth bandwidth is presently at 1 to 3 Mbits/sec. with higher data rates in the future. Current data rates permit between 15,000 and 45,000 location updates per second.
  • Wireless
    • local up to 50 meters
    • 802.11 local wireless protocols with a transmission distance in the range of 30 to 50 meters support between 11 Mbits/sec. and 20 Mbits/sec.
    • wide area - up to 4 miles
  • Serial
    • Serial ports normally max out at 115,200 bits/sec.  This allows about a max of roughly 1700 readings per second.
  • USB
    • USB can range from a low of around 2 Mbits/sec. to a theoretical high of 5Gbit/sec. with USB 3.0. But even the lowest speed USB gives the ability to transfer 30,000 points per second.
  • Precision: practically unlimited
    • Our very first test has given us 25 strong discrete reading per inch or an accuracy of 1 millimeter. Precision is a function of wave length, transmitter and receiver quality, sensitivity of the phase discrimination and the bit width of the A/D converter.  The physical limit to our accuracy is not known, but it expected to be well into the sub-millimeter range.
  • Size
    • The size of the control unit is primarily a function of cost, the size of the antennas a function of cost and frequency. Cheaper hardware is bigger, smaller is more expensive. Initial lower cost units are expected to range in size from a cigar box to a cigarette pack in size. Target size of the controller for a digital glove would be roughly the size of a large wrist watch.
       

© 2010 Human Instrumentation for Virtual Environments. Patents pending