US5790076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tracking sensor specially for computer applications
Assignee: Individual
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Filing: 1996-08-28
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Granted: 1998-08-04
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Expires: 2016-08-28
Abstract
Abstract The multi-dimensional tracking sensor especially for virtual reality and other real time computer applications. The disclosure describes an electro-magnetic (EM) tracking sensor that consists of a small lightweight transmitter with a transmitting antenna located on the target to be tracked and an array receiver with several local stationary antenna elements (FIG. 1). Multiple antenna elements of the array receiver lie on the perimeter of the measured space in positions determined by a self-calibration procedure. The proposed device calculates a cross correlation function between two signals at each receiving unit to determine a spatial position of the tracked element.
Inventors
- 👤 Jozef Sypniewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:57
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/022; G01S1/026; G01S5/00; G01S5/02; G01S5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A tracking device, comprising: (a) a remotely deployed transmitter which position is to be tracked, the transmitter generating an electromagnetic transmitter signal that self convolution has single global maximum at a measured time interval; (b) a plurality of stationary receivers for receiving the transmitted signal as a received signal, each receiver having a non coherent detector and generating at least one internal receiver signal that convolution with the transmitter signal has a single global maximum at the measured time interval and; (c) a signal processor for multiplying the received signal and the internal receiver signal to create a product, and optimizing each product in a matched filter having a transfer function that minimizes the energy of any signal uncorrelated with the product of the received signal and the internal receiver signal, and signals from the matched filters are cross correlated.
Claim 2
Dependent Claim
140 words
A tracking device, comprising: (a) a remotely deployed transmitter which position is to be tracked, the transmitter generating an electromagnetic transmitter signal that self convolution has single global maximum at a measured time interval; (b) a plurality of stationary receivers for receiving the transmitted signal as a received signal, each receiver having a non coherent detector and generating at least one internal receiver signal that convolution with the transmitter signal has a single global maximum at the measured time interval and; (c) a signal processor for multiplying the received signal and the internal receiver signal to create a product, and optimizing each product in a matched filter having a transfer function that minimizes the energy of any signal uncorrelated with the product of the received signal and the internal receiver signal, and signals from the matched filters are cross correlated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |