×

System and method for position determination of objects

  • US 20050141345A1
  • Filed: 03/28/2003
  • Published: 06/30/2005
  • Est. Priority Date: 04/09/2002
  • Status: Active Grant
First Claim
Patent Images

1. A detector base unit (200) specially adapted to a system (400) for position determination of objects in motion and for use in rooms with different kinds of noise such as line interference, characterised in that it comprises:

  • signal processing means (260) for receiving and sampling several different signals, means (230) for performing the following steps for processing the received data;

    analog to digital conversion of the sampled signals;

    transmission to a memory (240) for intermediate storage of digitalised signals;

    categorisation of the signals in frequency blocks for further processing with Fourier transform for calculation of Doppler shift from the position to the frequency block with the strongest signal;

    use of line detector for detection of single-frequency noise sources on the different signals, for correcting and providing accepted data;

    pattern comparison of all bits in order in order to determine a signature which is characterising for time and Doppler shift;

    warning to a central unit (410) via a network interface (215) when a sufficient volume of accepted data has been processed and is ready for further processing in the central unit (410), and transmission of the data to the central unit (410).

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×