ashtech GG Surveyor, Reference Manual

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Advanced Operation 27
Advanced Operation
Data Recording
All data recording in the receiver is done on an internal PCMCIA data card also
known as a PC card. The PC card is a compact and convenient way to store a lot of
data. The amount of data that can be stored depends upon the size of the card. PC
cards are available in sizes ranging from 2 to 20 Mb. The PC card in the GG Surveyor
is not removable, and is formatted to work only in the GG Surveyor. Do not take apart
your GG Surveyor to remove or replace the PC card.
File Types
The receiver is capable of creating a number of different files that cover a wide
variety of information. Primarily, the receiver will generate raw data files, ephemeris,
and site information files, but can also create position only files, event marker files,
and site attribute files. Each file is named for the first letter of the file. For example,
the raw data files begin with the letter “B”, so they are referred to as B-Files. A list of
the files is shown in Table 4.2.
CPD POS Reference Position of the other Receiver RECEIVED
FST Fast CPD Mode Selection ON
Table 4.2: File Types
File Type Description Format
B-file Raw data-generally code and carrier phase data,
position data, and SITE ID Binary
E-file Satellite ephemeris data Binary
S-file Site information data ASCII
C-file Position Data ASCII
M-file Event Marker files ASCII
D-file Site attribute files ASCII
ALMyy.ddd Almanac file Binary
Table 4.1: Default Receiver Parameter (continued)
Parameter Description Default