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GPS-20 Operating Manual
Rikaline
Rikaline Marketing Corp.
5F-1, 125, Roosevelt Road, Sec. 5, Taipei, Taiwan 116
Tel: ++886 2 2934 5456 Fax: ++886 2 2934 4373 E-Mail: info@rikaline.com.tw
web: www.rikaline.com.tw
3
1. Introduction
1.1 Overview
The Rikaline GPS-20 GPS Engine Board is a total solution GPS receiver, designed based on SiRF Star
II Architecture and pin to pin compatible with SiRF Start I engine board for replacing the system existing in
the market using SiRF Start I. 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
RS-232 or TTL and saves critical satellite data by built–in backup memory. With low power consumption, the
GPS-20 tracks up to 12 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 GPS-20 provides a host of features that make it easy for integration and use.
1.
SiRF Star II chipset with embedded ARM7TDMI CPU available for customized applications in
firmware.
2. High performance receiver tracks up to 12 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. Dual communication channels and user selectable baud rates allow maximum interface capability and
flexibility.
8. Optional communication levels, RS-232 and TTL meet ordinary application and new fashions of
connecting PDA with TTL or RS-232 output.
9. FLASH based program memory: New software revisions upgradeable through serial interface.
10. Built-in WAAS and EGNOS demodulator.
1.3 Technical specifications
1.3.1 Physical Characteristics
Dimension: 71.1(L) x 40.6(W) x 14.4(H) mm
2.80"(L) x 1.60"(W) x 0.57"(H).
Weight: 25g
1.3.2 Environmental Characteristics
1) Operating temperature: -40
o
C to +85
o
C
2) Storage temperature: -55
o
C to +100
o
C.
-45
o
C to +80
o
C with battery
1.3.3 Electrical Characteristics
1.3.3.1 General:
1) Frequency: L1, 1,575.42MHz
2) C/A Code: 1.023MHz Chip Rate
3) Channels: 12