Tip:
A higher mask angle setting can help ensure more accurate time is received from GNSS satellites,
as signal interference from objects in the environment can be reduced.
However, as the mask angle is made higher, satellites that are closer to the horizon cannot be used,
meaning there are less usable satellites. This creates a higher risk of a GNSS synchronization
dropout occuring as satellites enter and exit the usable mask angle throughout the day. With a 90°
mask angle no satellites can be used at all.
Important:
We recommend not increasing the mask angle value above 20° for most use cases.
4.
Set Minimum Satellites
The 'MINIMUM SATELLITES' threshold setting determines the minimum number of usable GNSS satellites
that should be available at a given time. If the number of detected satellites is is less than this the 'low
satellites' alarm will be triggered, see
11.4.1. Alarm Conditions and Correction Actions
.
By default, this is set to three satellites, as three satellites is the minimum number required for the GridTime
3000 to calculate a position fix. Position fixes are required to calculate the time from GNSS satellite signals, so
if less than three usable satellites are detected, the GridTime 3000 cannot synchronize to GNSS regardless of
the minimum satellites threshold.
For a different minimum satellites threshold, type a value into the textbox between 0 and 184 satellites.
Tip:
A higher minimum satellites setting will give you more warning when your GridTime 3000 has
insufficient satellites available, alerting you of the need to relocate your antenna to a site with better
GNSS satellite reception before synchronization loss. This offers superior GNSS synchronization
dropout prevention.
However, if the value is made too large, your GridTime 3000 will frequently trigger the 'low satellites'
alarm unnecessarily, flooding your system with meaningless alarms.
For this reason, we recommend not increasing this value above 10 for most cases.
Set Anti-Jamming Mode
This setting enables the GridTime 3000 to utilize the GNSS receiver's anti-jamming and spoofing algorithms that offer
protection against jamming or spoofing GNSS attacks.
Note:
This setting is enabled by default, and Microchip recommends leaving it enabled to ensure the most amount
of protection from jamming and spoofing attacks.
1.
Expand Advanced Settings
The advanced settings dropdown contains additional settings when it is expanded.
Provisioning
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 149
