Xiamen Caimore Communication Technology Co.,Ltd
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parameters of satellite orbit at a certain time according to kinds of ephemeris.
But whichever ephemeris be used, there will be a difference between the real
position and calculated one, that will be called ephemeris error.
Certainly, the other external variability factors also will generated
noticeable influence on the positioning accuracy of BD/GPS receiving terminal.
Such as the number of the currently visible satellites and the distribution of
the satellites.
4. Multipath effect ( the reflection signal of the receiver antenna from the
other surface)
Multipath effect refers to the receiver gets not only the satellite signal
but also reflection and refraction signal, due to the surrounding environment
of terminal receiving. For example, the probability of satellite received refract
or reflect signal is quite large, when it in high-rises building or in the jungle
mountains.
5.Human disturbance
The human impact of BD/GPS control section refers to the control section
problem or the deviation introduced by the user do the data processing, or
the affect by the operation of data processing software, or data processing
software imperfect algorithms affect on the positioning results. That is said
starting to mapping program while the navigation doing some additional data
processing, which will generated data deviation, and then to affect the
accuracy BD/GPS positioning.
