Software | Application | Tracking
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| Reading distance for active RFID? |
| by No Way |
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| Question last updated on February 09, 2006, 21:39 PM |
| Total views: 23630 |
| Answer |
| by Jun Zhao, No Way, jim eagleson |
Active RFID is a long range communication approach that has a reading distance between 50 (150 feet) to 100 meters (300 feet). It has significant longer range than UHF passive RFID and it is suitable for tracking vehicles, containers and people. You don’t have the ability to write to the tag from such long range. It may not be a good technology if you want to count your inventory due to the difficulty in distinguishing the nearby similar items.
The synopsis presented above is accurate for typical active RFID tags.
Savi Technologies (www.savi.com) has been providing this type of tag for over 12 years mostly for U.S. military purposes but also for rail, containerized cargo, trucking and other applications requiring large area RFID capability.
Savi's tags and readers include large data capacity, choke point location capabilities (door, gate, etc.), programmability as long as the reader-tag link is "solid", and 3-7 year battery life, depending on tag type, usage, and environment.
Read range can exceed 300 feet though our guaranteed range is 300 feet for most applications. Readers are omni-directional so that this should be interpreted as 300 feet radius which provides a coverage circle of 600 feet diameter.
We also provide handheld readers with range capability up to 150 feet.
Our EchoPoint tags can be used at a door (including dock doors) or at a 15-20 foot wide access gate with passing speeds up to 40 MPH with multiple tags in the field and at higher speed when only a few tags are present on a vehicle and or trailer or shipping container.
Train applications, for example, have much higher passing speed capability since tags on each box car are spaced far enough apart to be triggered one at a time.
All of our tags have unique IDs so that distinguishing between unique items is easy and our available data depth allows up to 128KB of data about the contents of a container or a full description of the tagged item and its status (owner, destination, etc.).
We can, for example, read a very large parking lot or deployment area (600x800 feet) using four or five readers and poll all or each of 900-plus tags on trucks, trailers, heavy lifting equipment, tanker trucks, etc. that are located in that lot.
We can change the data in each or all tags as long as the link to the tag is solid (there may be some that can be identified but do not program under marginal conditions... in which case data will not be changed.)
Check www.savi.com for details.
Jim Eagleson |
| Answer last updated on July 01, 2007, 13:59 PM |
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