Topcon HiPER GD, Operator'S Manual

Page: 127 / 180

Managing Receiver Memory
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Managing Receiver Memory
When using the receiver in static or dynamic applications, you may
need to know the amount of memory the receiver’s log file
occupies. The specific memory size depends on the type of data
being recorded. Use the formulas below to compute the
approximate size of the receiver’s log files.
• SS – the estimated size of one epoch of raw data in the
receiver’s log file (expressed in bytes).
• N – the number of observed satellites per epoch.
When recording only L1 data:
SS = 183 + 22*N
When recording L1 and L2 data:
SS = 230 + 44*N
Clearing the NVRAM
The receiver’s Non-Volatile Random Access Memory (NVRAM)
holds data required for satellite tracking, such as almanac and
ephemeris data, and receiver position. The NVRAM also keeps the
current receiver’s settings, such as active antenna input, elevation
masks and recording interval, and information about the receiver’s
internal file system.
Even though clearing the NVRAM is not a common (nor normally
a recommended) operation, there are times when clearing the
NVRAM can eliminate communication or tracking problems.
Clearing the NVRAM in your receiver can be interpreted as a “soft
boot” in your computer.
After clearing the NVRAM, your receiver will require some time to
collect new ephemerides and almanacs (around 15 minutes).
Clearing the NVRAM of your receiver will not delete any files
already recorded in your receiver’s memory. However, it will reset
your receiver to factory default values.