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C Commands Summary
MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 101
FIX VELOCITY
This command supports INS (Inertial Navigation System) integration. It accepts ECEF XYZ velocity values in
units of meters per second (m/s). This information is only used by the tracking loops of the receiver to aid in
reacquisition of satellites after loss of lock, otherwise it is ignored. It is not used in the position solution and velocity
calculations. This command is only useful for very high dynamics where expected velocity changes during the
signal blockage of more than 100 meters per second can occur. See Figure D-2 for ECEF definitions. The UNFIX
command is used to clear the effects of the FIX VELOCITY command. The FIX VELOCITY command will
override any previous FIX HEIGHT or FIX POSITION command. Use the UNFIX command to disable the current
FIX command.
Syntax:
Example:
fix velocity 315,212,150
FIX VELOCITY vx vy vz
Syntax Range Value Description Default Example
FIX VELOCITY - Command unfix fix velocity
vx ±999.99 X = Antenna Velocity (ECEF) in the X direction [m/s]. 315
vy ±999.99 Y = Antenna Velocity (ECEF) in the Y direction [m/s]. 212
vz ±999.99 Z = Antenna Velocity (ECEF) in the Z direction [m/s]. 150