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Help CenterUSB GPS Receiver GD75 for Latpop, Desktop Computer
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1.1 Overview
The GD75 Smart USB GPS Receiver is a total solution GPS receiver, designed
based on SiRF Star III Architecture. This positioning application meets strict needs
such as car navigation, mapping, surveying, security, agriculture and so on. Only
clear view of sky and certain power supply are necessary to the unit.saves critical
satellite data by built–in backup memory. With low power consumption, the
GD75 tracks up to 20 satellites at a time, re-acquires satellite signals in 100ms
and updates position data every second. Trickle-Power allows the unit operates a
fraction of the time and Push-to-Fix permits user to have a quick position fix even
though the receiver usually stays off.
1.2 Features
The GD75 provides a host of features that make it easy for integration and use.
1. SiRFstarIII chipset with embedded ARM7TDMI CPU available for customized
applications in firmware.
2. High performance receiver tracks up to 20 satellites while providing first fast fix
and low power consumption.
3. Differential capability utilizes real-time RTCM corrections producing 1-5 meter
position accuracy.
4. Compact design ideal for applications with minimal space.
5. A rechargeable battery sustains internal clock and memory. The battery is
recharged during normal operation.
6. User initialization is not required.
7. LED display status: The LED provides users visible positioning status. LED “ON”
when power connected and “BLINKING” that’s searching for satellite and LED is
steady alight when GD75 got positioned.
1.3 Technology specifications
1.3.1 Physical Dimension Single construction integrated antenna/receiver.
Size: 74 x 25 x 14 (mm)
1.3.2 Environmental Characteristics
1) Operating temperature: -40oC to +80oC(internal temperature).
2) Storage temperature: -45oC to +100oC.
1.3.3 Electrical Characteristics
1) Input voltage: +4.5 ~ 5.5 VDC without accessories.
2) Backup power: 3V Rechargeable Lithium cell battery, up to 500 hours discharge.
1.3.4 Performance
1) Tracks up to 20 satellites.
2) Update rate: 1 second.
3) Acquisition time
Reacquisition 0.1 sec., averaged
Hot start 1 sec., averaged
Warm start 38 sec., averaged
1. Introduction
1.1 Overview
The GD75 Smart GPS Receiver is a total solution GPS receiver, designed
based on SiRF Star III Architecture. This positioning application meets strict needs
such as car navigation, mapping, surveying, security, agriculture and so on. Only
clear view of sky and certain power supply are necessary to the unit.saves critical
satellite data by built–in backup memory. With low power consumption, the
GD75 tracks up to 20 satellites at a time, re-acquires satellite signals in 100ms
and updates position data every second. Trickle-Power allows the unit operates a
fraction of the time and Push-to-Fix permits user to have a quick position fix even
though the receiver usually stays off.
1.2 Features
The GD75 provides a host of features that make it easy for integration and use.
1. SiRFstarIII chipset with embedded ARM7TDMI CPU available for customized
applications in firmware.
2. High performance receiver tracks up to 20 satellites while providing first fast fix
and low power consumption.
3. Differential capability utilizes real-time RTCM corrections producing 1-5 meter
position accuracy.
4. Compact design ideal for applications with minimal space.
5. A rechargeable battery sustains internal clock and memory. The battery is
recharged during normal operation.
6. User initialization is not required.
7. LED display status: The LED provides users visible positioning status. LED “ON”
when power connected and “BLINKING” that’s searching for satellite and LED is
steady alight when GD75 got positioned.
1.3 Technology specifications
1.3.1 Physical Dimension Single construction integrated antenna/receiver.
Size: 74 x 25 x 14 (mm)
1.3.2 Environmental Characteristics
1) Operating temperature: -40oC to +80oC(internal temperature).
2) Storage temperature: -45oC to +100oC.
1.3.3 Electrical Characteristics
1) Input voltage: +4.5 ~ 5.5 VDC without accessories.
2) Backup power: 3V Rechargeable Lithium cell battery, up to 500 hours discharge.
1.3.4 Performance
1) Tracks up to 20 satellites.
Cold start 42 sec., averaged
4) Position accuracy:
A) Non DGPS (Differential GPS)
Position 5-25 meter CEP without SA
Velocity 0.1 meters/second, without SA
Time 1 microsecond synchronized GPS time
B) DGPS (Differential GPS)
Position 1 to 5 meter, typical
Velocity 0.05 meters/second, typical
C)EGNOS/WAAS/Beacon
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 (700 knots) max
Acceleration 4 G, max
Jerk 20 meters/second, max
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