主题:【原创】警察的反击:全是高科技 -- 同人于野
据说已经可以到10年了。
from wikipedia
Unlike passive RFID tags, active RFID tags have their own internal power source, which is used to power the integrated circuits and broadcast the signal to the reader. Active tags are typically much more reliable (e.g. fewer errors) than passive tags due to the ability for active tags to conduct a "session" with a reader. Active tags, due to their onboard power supply, also transmit at higher power levels than passive tags, allowing them to be more effective in "RF challenged" environments like water (including humans/cattle, which are mostly water), metal (shipping containers, vehicles), or at longer distances. Many active tags today have practical ranges of hundreds of meters, and a battery life of up to 10 years. Some active RFID tags include sensors such as temperature logging which have been used to monitor the temperature of perishable goods like fresh produce or certain pharmaceutical products. Other sensors that have been married with active RFID include humidity, shock/vibration, light, radiation, temperature, and atmospherics like ethylene. Active tags typically have much longer range (approximately 500 m/1500 feet) and larger memories than passive tags, as well as the ability to store additional information sent by the transceiver. The United States Department of Defense has successfully used active tags to reduce logistics costs and improve supply chain visibility for more than 15 years.
主动式携带的位数多,信息量大,也就不会有你说的撞车的情况发生。
- 相关回复 上下关系8
🙂后台够硬…… 西斯武士 字86 2009-02-15 10:44:49
🙂关于自来水 3 馄饨 字947 2007-09-11 21:49:03
🙂关于RFID 10 随园过客 字877 2007-09-02 16:11:56
🙂主动式的电池
🙂细说起来这里涉及很多因素了 8 随园过客 字1405 2007-09-03 14:57:39
🙂请教一下, 草纹 字62 2009-02-18 07:01:32
😄金属屏蔽能防住不? nasa 字21 2007-09-01 00:05:03
🙂应该没问题。薯片的包装袋应该就可以。 simplyred 字26 2007-09-02 00:41:01