The basic principle of GPS positioning is based on the instantaneous
calculation data of the instantaneous position of the high -speed movement, and
the method of the space distance is used to determine the location of the test
point. As shown in the figure, assuming that when T is placed on the ground to
be placed on the ground at the ground, the GPS receiver can be measured, and the
time for the GPS signal to reach the receiving machine △ T, plus other data such
as the satellite star calendar received by the receiver can determine the
following four four. Formula:
In the above four equations, the measuring point coordinates X, Y, Z, and
VTO are unknown parameters, where DI = C △ TI (i = 1, 2, 3, 4).
DI (i = 1, 2, 3, 4) is satellite 1. Satellite 2, satellite 3. Satellite 3.
Satellite 3, satellite 4 to receiver.
△ TI (i = 1, 2, 3, 4) is the time of satellite 1. Satellite 1. Satellite 2,
satellite 3, and satellite 4.
C is the speed of transmission of GPS signal (ie, the speed of light).
The meaning of each parameter in the four equations is as follows:
X, Y, Z are the spatial right -angle coordinates of the coordinates to be
tested.
XI, Yi, Zi (i = 1, 2, 3, 4) are satellite 1. Satellite 2, Satellite 3,
Satellite 4 in the right -angle coordinates of the space at the time of T.
VT I (i = 1, 2, 3, 4) The bells of satellite clocks with satellite 2,
satellite 2, satellite 3, and satellite 4 are provided by the satellite star
calendar.
VTO is the bell of the receiver.
From the above four equations, the clock difference of the coordinates X,
Y, Z and the receiver of the coordinates to be measured at the above four
equations.
GPS satellite sends its own star parameters and time information. Under the
independent GPS mode, the positioning terminal receives the information through
the antenna from the GPS satellite, and the three -dimensional position, three
-dimensional direction and motion speed and time information of the receiving
machine are calculated. Because satellites are directly broadcasting from high
-altitude, the signal is weak and the transmission rate is slow. This gives the
positioning terminal a certain problem.
Read recommendations:
gps tracker with magnet wholesale
Dog gps tracker
NB20 -4G Bluetooth Smart Pet Tracker
Precautions for car GPS applications
GPS module
Language
EN
