Appendix C: Technical Terms
Ambiguity: unknown quantity is the integer number of cycles of the carrier
phase measured from the satellite to the receiver.
Baseline: The connection line of the two measurement points, on which to
receive GPS signals and collect observation data simultaneously.
Broadcast ephemeris: message released by the satellite demodulator satellite
orbit parameters.
SNR (Signal-to-noise ratio): an endpoint signal power to noise power ratio.
Cycle skipping: interfere loop skips a few cycles from a balanced point, and
stabilize in the new equilibrium point, this make the phase integer number of
cycles to generate an error.
Carrier: As the carrier, Frequency, amplitude or phase modulation of the
modulated wave by a known reference value.
C / A code: GPS coarse / acquisition code, modulate the pseudo-random binary
code for the 1023 bit duplex, the bit rate of which is 023MHz, and code
repetition period of 1ms.
Difference measurement: GPS measurements employ cross-satellite
cross-receiver and cross-epoch.
Difference Positioning: the method of determining the relative coordinates
between two or more receiver by tracking the same GPS signal.
Geometric dilution of precision: Describe the contribution of satellite geometry
errors factor in dynamic positioning
Eccentricity:
where a, b of the semi-major axis and semi-minor
axis.
Ellipsoid: mathematical graphics formed when an ellipse moves around the
minor axis of rotation in Geodetic Survey.
Ephemeris: the position of celestial bodies over time parameters.
Flattening:
a is the semi-major axis, b is the semi-minor axis, e is the eccentricity.
Geoid: similar to the mean sea level and extends to the mainland special planes.
Geoid everywhere perpendicular to the direction of gravity.
Ionosphere delay: delay of radio waves through the ionosphere (non-uniform
dispersion medium)
L-band: The radio frequency range of 390-1550MHz.
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