Holux gm-83 Manual Do Utilizador
GM-83 User’s manual
4
1.3.4 Performance
1)
Tracks up to 12 satellites.
2)
Update rate: 1 second.
3)
Acquisition time:
Reacquisition
0.1
sec, averaged
Hot start
8
sec. averaged
Warm start
38
sec. averaged
Cold start
45
sec. averaged
4)
Position accuracy:
Non DGPS (Differential GPS)
Position
5~25 meter
CEP
Velocity
0.1
meters/second.
Time
1
microsecond synchronized GPS time
DGPS (Differential GPS)
Position
1 to 5
meters, typical
Velocity
0.05
meters/second, typical
EGNOS/WAAS
Position
< 2.2
meters, horizontal 95% of time
< 5
meters, vertical 95% of time
5)
Dynamic Conditions:
Altitude
18,000
meters(60,000 feet) max
Velocity
515
meters/second (1000 knots) max
Acceleration
4
G, max
Jerk
20
meters/second³, max
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
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.
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data is obsolete, it may take more time to achieve a navigation solution.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:
data is obsolete, it may take more time to achieve a navigation solution.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:
z
Moving further than 500 kilometers.
z
Failure of Data storage due to the inactive internal memory battery.