Unverified85% confidenceDecision RuleTime unknown
选4G款务必确认支持GPS+基站+WiFi三重定位，纯GPS在室内漂移可达数十米，无法定位老人具体楼层或房间
1
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85%
Confidence
Long-term
Relevance
-
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Unverified选购老人/儿童4G定位手环必须确认支持GPS+北斗+LBS+WiFi四重定位，纯LBS基站定位误差可达数百米至数公里，仅室外空旷处GPS精度才能达到5-15米85% similarUnverified定位追踪器分为GPS+LBS+WiFi三模融合定位和纯GPS两类，纯GPS在室内和高楼间会漂移50米以上，选择支持A-GPS辅助+LBS基站+WiFi的三模设备才能保证室内定位误差＜20米84% similarUnverified定位方式优先选支持GPS+基站LBS+WiFi三重定位的设备，室内环境依赖WiFi定位精度可达10-50米，纯GPS室内几乎失效84% similarUnverified老人定位器必须支持GPS+北斗+基站+WiFi四重定位，仅靠GPS在室内和高楼间会出现50-200米漂移，纯基站定位误差可达300米以上84% similarUnverified定位需支持GPS+北斗+WiFi+LBS四重定位，室内无GPS信号时靠WiFi/基站定位误差可控制在50米内，单纯GPS定位在室内会漂移到几百米83% similar
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