Tag communication protocol & system
US6329944A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2000 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | May 12, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/765
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of communicating to a RF tag having a low power mode and a scan mode with a radar and an interrogator. The method comprises the steps of alternating the RF tag between the low power mode and the scan mode and then transmitting a wake-up call to the RF tag with the radar. Next, the wake-up call is received from the radar by the RF tag when the RF tag is in the scan mode. Once the wake-up call has been received, the radar will transmit a downlink message to the RF tag. Upon receipt of the downlink message, the RF tag will send an uplinked message to the radar. After the uplink message has been sent to the radar, the RF tag will return to the low power mode. By alternating the RF tag between the low power mode and the scan mode, the power consumption of the RF tag is greatly reduced thereby increasing the battery life thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.