Spectra Precision Epoch 25 L1, Руководство пользователя

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Epoch 25 L1/L2 GPS System User Guide
9
Introduction
1
1.3
Use and care
The receiver can withstand the rough treatment that typically occurs in the field.
However, the receiver is a high-precision electronic instrument and should be treated
with reasonable care.
C
WARNING –
Operating or storing the receiver outside the specified temperature range
can damage it. For more information, see Chapter 5, Specifications .
High-power signals from a nearby radio or radar transmitter can overwhelm the
receiver circuits. This does not harm the instrument, but it can prevent the receiver
from functioning correctly. Do not use the receiver within 400 meters of powerful
radar, television, or other transmitters. Low-power transmitters such as those used in
cell phones and two-way radios do not normally interfere with receiver operations.
For more information, contact your Spectra Precision dealer.
1.4
COCOM limits
The U.S. Department of Commerce requires that all exportable GPS products contain
performance limitations so that they cannot be used in a manner that could threaten
the security of the United States.
The following limitation is implemented on the receiver: Immediate access to satellite
measurements and navigation results is disabled when the receiver’s velocity is
computed to be greater than 1000 knots, or its altitude is computed to be above
18,000 meters (59,055 feet). The receiver continuously resets until the COCOM
situation is cleared.
1.5
Geofence
This product may contain a Geofence.
A Geofence is a virtual boundary which restricts the product from being used outside a
predetermined region. When the product is taken beyond the designated boundary
limit or is started beyond that same limit, the receiver cannot obtain a high precision
fixed integer solution and will only function in an autonomous mode.