Child missing preventive garment accessory on basis of GPS (global positioning system) positioning
A technology of GPS positioning and GPS module, which is applied in the direction of clothing, clothing, satellite radio beacon positioning system, etc., can solve the problems of inability to protect and weak self-protection ability of children, and achieve the effect of enhancing practicability
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[0014] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0015] The basic principle of GPS positioning is to use the method of spatial distance resection to determine the position of the point to be measured according to the instantaneous position of the high-speed moving satellite as the known starting data. Such as figure 1 As shown, assuming that a GPS receiver is placed on the ground to be measured at time t, the time Δt for the GPS signal to reach the receiver can be measured, coupled with other data such as the satellite ephemeris received by the receiver, it can be determined as figure 1 of the four equations. In the four equations, the coordinates x, y, z and Vto of the point to be measured are unknown parameters, where di=cΔti (i=1, 2, 3, 4). di(i=1, 2, 3, 4) are the distances between satellite 1, satellite 2, satellite 3, satellite 4 and the receiver respectively. Δti (i=1, 2, 3, 4) is the time elapsed f...
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