Specifications

16 Z-Family Techncial Reference Manual
mode is set to off, in which case the highest rate is 1 Hz (if Fast CPD mode is on, 10
HZ is available). Also, if the [F] option is not installed, the highest output rate
supported is 5Hz.
Transferring GPS Data
GPS data stored on the PC Card may be transferred to a computer for post-processing
by loading the PC Card in a PCMCIA Card drive and then running the converter from
Download to decompress the files to a normal format. Data can also be downloaded
through one of the serial ports on the receiver.
Transferring Data Files using DOS
The PC Card is a standard DOS storage device, therefore, files may be transferred
directly from the PC card in a PC card reading drive to a computer using standard
DOS commands or the Windows File Manager. For example, to copy the entire
contents of the PC Card in drive D to the
C:\GPSdata directory, use the following
command:
xcopy d:\*.* c:\data\*.* /s
Be aware that many of the files are in a compressed format and will NOT be usable until a
conversion is performed with the Download software. The converter from Download also works
directly from the PC card drive, in which case xcopy is not necessary.
Transferring Data Files using Download
Download can be used to transfer and decompress files from the PC Card to a
computer for post-processing. For more information on using Download, refer to the
Receiver Communication Software User’s Guide.
Synchronization to GPS Time
All GPS receivers contain internal clocks. These clocks are of varying quality, and for
cost reasons, are not generally accurate enough to be precisely synchronized to GPS
system time (or “true GPS time”). The effect of receiver clock error shows up in two
places. First, it affects the instant in time when measurement snapshots are taken, and
second, it introduces errors in the values of the measurements themselves. This means
that two receivers at the same location (zero-baseline), but with different clock errors,
will, among other things, provide different position measurements. Similarly, if two