Resources Contact Us Home
Method and apparatus for determining location using signals-of-opportunity

Image Number 18 for United States Patent #8018383.

A signal-of-opportunity location device (SOLD) that may be situated in a complex radio propagation environment with multiple RF signal obstructions receives RF signals from a distant transmitter. The RF signals from the distant transmitter interact with obstructions in the propagation environment local to the SOLD. The local obstructions perturb the RF signals causing the RF signals to exhibit near field behavior in the complex radio propagation environment. The SOLD receives the locally perturbed signals. The SOLD detects signal characteristics of RF signal components of the received signals and compares these signal characteristics with reference data in a reference data store to determine the current location of the SOLD.

  Recently Added Patents
Reflective mask blank and method of manufacturing a reflective mask
Vapor phase decarbonylation process
Single integrated circuit configured to operate both a capacitive proximity sensor device and a resistive pointing stick
Dental fillers including a phosphorus containing surface treatment, and compositions and methods thereof
Imaging lens having five lens elements, and electronic apparatus having the same
Article based on a composition containing a crosslinked blend of elastomers
Sign language keyboard and sign language searching apparatus using the same
  Randomly Featured Patents
Electromagnetic actuators
Methods and compositions useful to prevent in-grown hair arising from shaving
Process for producing cards
Conveyer-type unit for radiation sterilization
Refrigerating machine
Capsule piercing module
Pocket-style identification bracelet
Displaying magnetic panel and its display device
Gypsum-containing product
Collapsible container