US6064320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic vehicle identification system capable of vehicle lane discrimination
Assignee: Texas Instruments Inc
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Filing: 1998-04-03
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Granted: 2000-05-16
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Expires: 2018-04-03
Abstract
Abstract A system of vehicle identification with a first interrogator that uses a Lower SideBand (LSB) receiver to receive a modulated signal from a vehicle transponder and a second interrogator that uses an Upper SideBand (USB) receiver to receive another modulated signal. The two interrogators are adjacent to each other at a toll plaza, and operate at different carrier frequencies to force a signal frequency bandgap between communication signals in adjacent vehicle lanes.
Inventors
- 👤 Loek D'Hont
- 👤 Anne Tip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:56
CPC Classifications
G; G07; G07B; G07B15/00; G07B15/06; G07B15/063; G08; G08G; G08G1/00; G08G1/01; G08G1/017; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/765
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A system of vehicle identification comprising: a) a first interrogator, said first interrogator having a Lower SideBand (LSB) receiver for receiving a first modulated signal from a first vehicle transponder, said first interrogator further having a first demodulator operable to extract a first demodulated signal from the LSB of said first modulated signal; and b) a second interrogator, said second interrogator having an Upper SideBand (USB) receiver for receiving a second modulated signal from a second vehicle transponder, said second interrogator having a second demodulator operable to extract a second demodulated signal from the USB of said second modulated signal.
Claim 2
Independent Claim
100 words
A system of vehicle identification comprising: a) a first interrogator, said first interrogator having a Lower SideBand (LSB) receiver for receiving a first modulated signal from a first vehicle transponder, said first interrogator further having a first demodulator operable to extract a first demodulated signal from the LSB of said first modulated signal; and b) a second interrogator, said second interrogator having an Upper SideBand (USB) receiver for receiving a second modulated signal from a second vehicle transponder, said second interrogator having a second demodulator operable to extract a second demodulated signal from the USB of said second modulated signal.
Claim 3
Dependent Claim
29 words
The system of claim 1 wherein said first modulated signal has a carrier of a first frequency and said second modulated signal has a carrier of a second frequency.
Claim 4
Dependent Claim
15 words
The system of claim 2 wherein said first frequency is less than said second frequency.
Claim 5
Dependent Claim
43 words
The system of claim 1 and further comprising a third interrogator, which has a LSB receiver, said third interrogator being positioned adjacent to said second interrogator such that said second interrogator is horizontally adjacent to said first and third interrogators and positioned therebetween.
Claim 6
Independent Claim
133 words
A system of vehicle identification comprising: a) a first interrogator, said first interrogator having a Lower SideBand (LSB) receiver for receiving a first modulated signal from a first vehicle transponder, said first interrogator having a first demodulator operable to extract a first demodulated signal from the LSB of said first modulated signal, said first interrogator further comprising a first sideband transmitter; and b) a second interrogator, said second interrogator having an Upper SideBand (USB) receiver for receiving a second modulated signal from a second vehicle transponder, said second interrogator having a second demodulator operable to extract a second demodulated signal from the USB of said second modulated signal, said second interrogator further comprising a second sideband transmitter, said second sideband transmitter employing the opposite sideband as was employed by the first sideband transmitter.
Claim 7
Independent Claim
133 words
A system of vehicle identification comprising: a) a first interrogator, said first interrogator having a Lower SideBand (LSB) receiver for receiving a first modulated signal from a first vehicle transponder, said first interrogator having a first demodulator operable to extract a first demodulated signal from the LSB of said first modulated signal, said first interrogator further comprising a first sideband transmitter; and b) a second interrogator, said second interrogator having an Upper SideBand (USB) receiver for receiving a second modulated signal from a second vehicle transponder, said second interrogator having a second demodulator operable to extract a second demodulated signal from the USB of said second modulated signal, said second interrogator further comprising a second sideband transmitter, said second sideband transmitter employing the opposite sideband as was employed by the first sideband transmitter.
Claim 8
Dependent Claim
21 words
The system of claim 5 wherein said first transmitter is an LSB transmitter, and said second transmitter is a USB transmitter.
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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) | 2003-05-16 | 2003-11-15 | 2004-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-16 | 2007-11-15 | 2008-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-16 | 2011-11-15 | 2012-05-16 | $7700.00 | Window Closed / Lapsed |