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1. Introduction
1.1 Overview
GR-213U 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. It
communicates with other electronic utilities via compatible dual-channel through USB interface and saves
critical satellite data by built–in backup memory. With low power consumption, the GR-213U tracks up to 20
satellites at a time, re-acquires satellite signals in 100 ms 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 GR-213U 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. Compact design ideal for applications with minimal space.
4. A rechargeable battery sustains internal clock and memory. The battery is recharged during normal
operation.
5. Users can adjust power-saving percentage (20%~80%), which achieves the best power efficiency.
6. User initialization is not required.
7. LED display status: The LED provides users visible positioning status. LED “ON” when power connected
and “BLINKING” when GR-213U got positioned.
8. Water proof design for industry standard.
1.3 Technology specifications
1.3.1 Physical Dimension
Single construction integrated antenna/receiver.
Size: 64.5 x 42 x 17.8 (mm)
2.54" x 1.65 x 0.7 (Inch).
1.3.2 Environmental Characteristics
1) Operating temperature: -40
o
C to +80
o
C(internal temperature).
2) Storage temperature: -45
o
C to +100
o
C.
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 8 sec., averaged
Warm start 38 sec., averaged
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