Pulse enabling method for realizing rapid GPS location

Abstract

The invention optimizes the starting procedure of GPS location according to the principle of a GPS, thus shortening the start time and achieving the aim of quick positioning. In order to realize the aim, the invention comprises the following steps: step 1, a receiver of the GPS is cold started; step 2, the receiver of the GPS enters a sleep mode, and a pulsed mode is started; step 3, receiver of the GPS updates satellite information; step 4, a timer is started, the timing period is T which is less than 2 hours, and a timing count mode is entered; if the count overflows, a timer conter is reset and sends out a pulse signal; and the step 3 is returned. The invention has the effect that after being started for a first time, the receiver of the GPS only has two states which are the sleep mode and a navigation mode, wherein, warm boot is the only channel for switching the sleep mode and the navigation mode, thus solving the time-consuming problem of cold boot and warm boot.

Description

technical field [0001] The invention relates to GPS technology, in particular to a pulse start method for realizing fast GPS positioning. Background technique [0002] GPS is the abbreviation of NAVSTAR / GPS (Navigation Satellite Timing and Ranging / Global Positioning System), which is a navigation satellite ranging and timing, positioning and navigation system developed by the US Department of Defense. These 24 satellites are equally spaced on 6 orbital planes at 60 degrees to each other. This satellite configuration basically ensures that at least 4 GPS satellites can be observed at any position on the earth at the same time. GPS consists of three parts: First, GPS satellites (space part): 21 working satellites, 3 spare satellites; second, ground support system (ground monitoring part): 1 main control station, 3 injection stations, 5 monitoring stations The third is the GPS receiver (user part): receive the signals transmitted by GPS satellites to obtain the necessary navig...

AI Technical Summary

Problems solved by technology

[0017] According to the regulations and limitations of the GPS start-up method, during a cold start, as long as the ephemeris information is lost or the device moves over 1,000 kilometers in the shutdown state, it must be restarted to find at least 4 satellites, which takes a long time; and if the signal is not good, it will take more time

Because the radius of the earth is 6371 kilometers, then the circumference is 40055 kilometers, there are 21 working synchronous satellites in the sky, plus the intersection area of ​​every two connected satellites, then the coverage area of ​​each satellite is slightly larger than 40055 / 21=1907 kilometers, like figure 2 As shown, D1 and D2 are about 1907 kilometers away, that is to say, if you move 1000 kilometers within the coverage of one satellite, you may reach the coverage of other satellites. Since the power is turned off at this time, the information of the satellite before moving It cannot be updated in time, so that the information of the current satellite (x, y, z) cannot be obtained after turning on the computer, so it is impossible to quickly calculate its position, and it is necessary to re-search the satellite until the satellite information (x, y, z) is found again. z), so the startup time will be very long

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