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    • 3. 发明申请
    • Power saving operation in a GPS-based asset tracking unit
    • 基于GPS的资产跟踪单元节电操作
    • US20050200520A1
    • 2005-09-15
    • US10830520
    • 2004-04-23
    • Joseph Jesson
    • Joseph Jesson
    • G01S19/24G01S19/34G08B1/08H04Q7/00G01S5/14
    • G01S19/34G01S19/24
    • A GPS receiver is activated and it is determined whether the GPS receiver has received within a first predetermined attempt period of time a set of GPS signals that is adequate to determine a location of the GPS receiver. If not, the GPS receiver is deactivated for a first delay period of time. The GPS receiver is then activated again and it is determined whether the GPS receiver has received a complete set of GPS signals within a second predetermined attempt period. If not, the GPS receiver is deactivated for a second delay period of time that is longer than the first delay period of time. The GPS receiver is then activated once more and again attempts to acquire a complete set of GPS signals.
    • GPS接收机被激活,并且确定GPS接收机是否在第一预定尝试时间段内接收到足以确定GPS接收机的位置的一组GPS信号。 如果不是,GPS接收器在第一延迟时间段内被去激活。 然后再次激活GPS接收机,并且确定GPS接收机是否在第二预定尝试周期内已经接收到一组完整的GPS信号。 如果不是,则GPS接收器在长于第一延迟时间段的第二延迟时间段内被去激活。 然后,GPS接收机一次又一次地尝试获取一整套GPS信号。