作者: Charles Frederick Fey , William H. Meise
DOI:
关键词: Real-time computing 、 Electronic security 、 Alarm signal 、 Geolocation 、 Geography 、 Computer security
摘要: A user-portable device determines its own geolocation, and compares that location with a region defined by at least one memorized specified distance. deviation or alarm signal is generated when either within without the region. In version, geolocation of another, remote device.