US 2003/0144041 A1 · Calibration method for station orientation

Abstract

In optical wireless networks, light beams are transmitted over-the-air and maximum performance is achieved when light beams are aligned with corresponding light detectors. A feedback control system is created between transmitting and receiving units, wherein the receiving unit provides positional data about the light beam from the transmitting unit. The transmitting unit uses the data provided to make adjustments to its light beam. However, in order to use the positional data, the units must be operating with a common coordinate basis. A method is provided for determining the basis and generating the transformation needed to modify positional data from one unit into information that is useful for the other unit. Additionally, a method is presented for using the positional data to maintain proper alignment of the light beam.

Claims47

Dependent claims

A method for providing a common coordinate basis between two optical wireless units wherein information is transmitted between the optical wireless units via light beams, the method comprising:

at the first optical wireless unit, moving the light beam in a prespecified pattern;
at the second optical wireless unit:
determining reference positions;
determining a basis for the plurality of optical detectors;
sensing the light beam using a plurality of optical detectors;
calculating measured positional data based on the sensed light beam;
calculating a set of coefficients using the basis and measured positional data;
and
transforming positional data measured at the second optical wireless unit with the coefficients prior to transmitting the positional data to the first optical wireless unit.

6 more elements

Dependencies are inferred from the claim text.

Calibration method for station orientation

Life of this patent

Calibration method for station orientation

Life of this patent

Abstract

Claims47