Javad DELTAGNSS Receiver, Руководство оператора

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Receiver and File Maintenance
Managing Receiver Memory
Using TriPad to Clear NVRAM
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5.4. Managing Receiver Memory
When using the DELTA 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
5.5. 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 DELTA 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 DELTA’s
memory. However, it will reset your receiver settings to factory default values.
In addition, the NVRAM keeps information about the receiver file system.
Note that after clearing the NVRAM, the receiver’s SAT LED will flash yellow for a few seconds
indicating that the receiver is scanning and checking the file system.
5.5.1. Using TriPad to Clear NVRAM
1. Press the power button to turn off the receiver.
2. Press and hold the FN button.