Operational Characteristics; Initialization - Holux GM-83 User Manual

GM-83 User's manual
1.3.4 Performance
1) Tracks up to 12 satellites.
2) Update rate: 1 second.
3) Acquisition time:
Reacquisition
Hot start
Warm start
Cold start
4) Position accuracy:
Non DGPS (Differential GPS)
Position
Velocity
Time
DGPS (Differential GPS)
Position
Velocity
EGNOS/WAAS
Position
5) Dynamic Conditions:
Altitude
Velocity
Acceleration
Jerk
1.3.5 Interfaces
1) Dual communication channel TTL or RS232 levels, with user selectable baud rate (4800-Default,
9600, 19200, 38400).
2) NMEA 0183 Version 2.2 ASCII output (GGA, GLL, GSV, GSA, RMC, VTG).
3) Real-time Differential Correction input (RTCM SC-104 message types 1, 2 and 9).

2. Operational characteristics

2.1 Initialization

As soon as the initial self-test is complete, the GM-83 begins the process of satellite acquisition and
tracking automatically. Under normal circumstances, it takes approximately 45 seconds to achieve a position
fix, 38 seconds if ephemeris data is known. After a position fix has been calculated, information about valid
position, velocity and time is transmitted over the output channel.
The GM-83 utilizes initial data, such as last stored position, date, time and satellite orbital data, to
achieve maximum acquisition performance. If significant inaccuracy exists in the initial data, or the orbital
data is obsolete, it may take more time to achieve a navigation solution. The GM-83 Auto-locate feature is
capable of automatically determining a navigation solution without intervention from the host system.
However, acquisition performance can be improved as the host system initializes the GM-83 in the following
situation:
Moving further than 500 kilometers.
Failure of Data storage due to the inactive internal memory battery.
0.1 sec, averaged
8 sec. averaged
38 sec. averaged
45 sec. averaged
5~25 meter CEP
0.1 meters/second.
1 microsecond synchronized GPS time
1 to 5 meters, typical
0.05 meters/second, typical
< 2.2 meters, horizontal 95% of time
< 5 meters, vertical 95% of time
18,000 meters(60,000 feet) max
515 meters/second (1000 knots) max
4 G, max
20 meters/second³, max
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