US6297734B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Randomization of transmit time
Assignee: Northrop Grumman Systems Corp
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Filing: 1999-09-23
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Granted: 2001-10-02
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Expires: 2019-09-23
Abstract
Abstract The present invention discloses an apparatus for randomizing the transmit time in a tag RFID communication system. The CRC calculation is implemented through the use of software stored in the system microprocessor and the calculations vary upon a plurality of dynamic inputs including temperature and motion of the tag. The tag apparatus of the present invention includes temperature and motion monitors for monitoring the environmental conditions of the tag. A microprocessor in communication with the sensor calculates the next pseudo-random transmission based upon the dynamic inputs. A transmitter transmits a signal to the system monitor.
Inventors
- 👤 David Livingstone Richardson
- 👤 Gabor Elek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:48
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/0716; G06K19/0717; G06K7/00; G06K7/0008; G06K7/10; G06K7/10009; G06K7/10019; G06K7/10029; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1427; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2414; G08B13/2417; G08B13/2451; G08B13/2462; G08B13/2465; G08B13/2482; G08B13/2488; G08B21/00; G08B21/02; G08B21/0202; G08B21/0227; G08B25/00; G08B25/007; G08B25/01; G08B25/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
90 words
A method of producing a psuedo-random RF signal in a tag for use in a multiple tag monitoring system, each of said tags including at least one on-board environmental sensor, an on-board psuedo-random transmit time calculation circuit and an on-board RF-transmitter, said method comprising the steps of: a) monitoring environmental conditions of a tag through the on-board sensor; b) calculating a psuedo-random transmit time based upon monitored environmental conditions through the on-board calculation circuit; and c) transmitting a signal at the calculated psuedo-random transmit time through the on-board RF transmitter.
Claim 2
Independent Claim
90 words
A method of producing a psuedo-random RF signal in a tag for use in a multiple tag monitoring system, each of said tags including at least one on-board environmental sensor, an on-board psuedo-random transmit time calculation circuit and an on-board RF-transmitter, said method comprising the steps of: a) monitoring environmental conditions of a tag through the on-board sensor; b) calculating a psuedo-random transmit time based upon monitored environmental conditions through the on-board calculation circuit; and c) transmitting a signal at the calculated psuedo-random transmit time through the on-board RF transmitter.
Claim 3
Dependent Claim
21 words
The method of producing a pseudo-random RF signal of claim 1 further comprising the step of repeating the steps a-c continuously.
Claim 4
Dependent Claim
29 words
The method of producing a pseudo-random RF signal of claim 1 wherein the step of monitoring the environmental conditions of the tag includes the monitoring of the tag temperature.
Claim 5
Dependent Claim
29 words
The method of producing a pseudo-random RF signal of claim 1 outlining the step of monitoring the environmental conditions of the tag includes the monitoring of the tag motion.
Claim 6
Independent Claim
90 words
A method for producing a psuedo-random RF signal in a tag for use in a multiple tag monitoring system, each of said tags including an on-board psuedo-random transmit time calculation circuit and an on-board data storage memory, said method comprising the steps of: a) calculating a psuedo-random transmit time through an on-board calculation circuit based upon the following: i) data stored in the on-board memory as user defined fields; ii) data stored in the on-board memory as fixed fields; and iii) data stored in the on-board memory as dynamic fields.
Claim 7
Independent Claim
90 words
A method for producing a psuedo-random RF signal in a tag for use in a multiple tag monitoring system, each of said tags including an on-board psuedo-random transmit time calculation circuit and an on-board data storage memory, said method comprising the steps of: a) calculating a psuedo-random transmit time through an on-board calculation circuit based upon the following: i) data stored in the on-board memory as user defined fields; ii) data stored in the on-board memory as fixed fields; and iii) data stored in the on-board memory as dynamic fields.
Claim 8
Dependent Claim
20 words
The method for producing a pseudo-random RF signal of claim 5 further comprising repeating the steps of claim 5 continuously.
Claim 9
Dependent Claim
24 words
The method for producing a pseudo-random RF signal of claim 5 wherein the dynamic field includes data indicating monitored environmental conditions of the tag.
Claim 10
Dependent Claim
22 words
The method for producing a pseudo-random RF signal of claim 7 wherein the monitored environmental conditions include the temperature of the tag.
Claim 11
Dependent Claim
22 words
The method for producing a pseudo-random RF signal of claim 7 wherein the monitored environmental conditions include the motion of the tag.
Claim 12
Dependent Claim
60 words
A tag for use in a radio frequency identification system comprising: a) at least one on-board sensor for monitoring the environmental conditions of the tag; b) an on-board microprocessor for receiving data from the sensor to calculate a next psuedo-random transmission time of the tag; and c) an on-board transmitter for transmitting a signal at the calculated psuedo-random transmit time.
Claim 13
Dependent Claim
60 words
A tag for use in a radio frequency identification system comprising: a) at least one on-board sensor for monitoring the environmental conditions of the tag; b) an on-board microprocessor for receiving data from the sensor to calculate a next psuedo-random transmission time of the tag; and c) an on-board transmitter for transmitting a signal at the calculated psuedo-random transmit time.
Claim 14
Dependent Claim
12 words
The tag of claim 10 wherein said sensor is a temperature sensor.
Claim 15
Dependent Claim
12 words
The tag of claim 10 wherein said sensor is a motion sensor.
Claim 16
Dependent Claim
31 words
The tag of claim 10 further comprising a timing circuit in communication with said microprocessor for receiving the calculated transmit time and for initializing said transmitter at the calculated transmit time.
Claim 17
Dependent Claim
23 words
The tag of claim 10 wherein said tag includes a power source for operation of the microprocessor, sensor and transmitter of said tag.
Claim 18
Dependent Claim
14 words
The tag of claim 10 wherein said tag includes a random access memory (RAM).
Claim 19
Dependent Claim
12 words
The tag of claim 10 wherein said tag includes a non-volatile memory.
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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) | 2004-10-01 | 2005-04-02 | 2005-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-01 | 2009-04-02 | 2009-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-01 | 2013-04-02 | 2013-10-02 | $7700.00 | Window Closed / Lapsed |