NAVIOR-24S
™
CHAPTER IV
Operation and Performance
62
NAVIOR-24S ™
Revision
V1.00 20.05.2008
Performance Characteristics
Update Rate
The NAVIOR-24S GPS/GLONASS receiver computes and outputs position solutions once per
second, on the second. NMEA outputs can be scheduled at a slower rate using NMEA command
$PORZB (see Appendix
С
).
Dynamic Limits
The dynamic operating limits for the NAVIOR-24S GPS/GLONASS receiver are listed below.
These operating limits assume that the GPS/GLONASS module is correctly embedded and that the
overall system is designed to operate under the same dynamic conditions.
Table IV-2 - NAVIOR-24S GPS/GLONASS Receiver Operating Limits
Operation
Limit
Acceleration
5 g (49 m/s
2
)
Jerk 20
m/s
3
Speed 500
m/s
Altitude 18,000
m
Note
– The NAVIOR-24S GPS/GLONASS Receiver firmware contains an algorithm that allows
either the speed limit or altitude limit to be exceeded, but not both. This allows the receiver to be
used in high altitude (research balloon) applications without a special factory configuration.
Re-Acquisition
Re-acquisition time for momentary signal blockages is typically under 2 seconds. When a satellite
signal is momentarily interrupted during normal operation, the receiver continues to search for the
lost signal at the satellite's last known Doppler frequency. If the signal is available again within 15
seconds, the receiver will normally re-establish track within two seconds. If the lost signal is not re-
acquired within 15 seconds, the receiver initiates a broader frequency search. The receiver will
continue to search for the satellite until it falls below the elevation mask.
