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Rikaline GPS-20
GPS Engine Board
SiRF Star II
V1.0 Aug 09, 2002
User’s Guide
Rikaline Marketing Corp.
5F-1, 125, RooseveltRd., Sec. 5, Taipei 116, Taiwan, R.O.C.
Phone: +886-2-2934-5456 Fax: +886-2-2934-4373
E-Mail: info@rikaline.com.tw Web: www.rikaline.com.tw
All Right Reserved
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GPS-20 Operating Manual Rikaline TABLE OF CONTENTS ……………………………………………………………………………………….. 1. Introduction 3 …………………………………………………………………………………….. 1.1 Overview 3 …………………………………………………………………………………….. 1.2 Features 3 ……………………………………………………………….. 1.3 Technical Specifications 3 ……………………………………………………………….… 2. Operational Characteristics 5 …………………………………………………………………………………. 2.1 Initialization 5 …………………………………………………………………………………. 2.2 Navigation 5
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GPS-20 Operating Manual Rikaline 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 s
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GPS-20 Operating Manual Rikaline 1.3.3.2 Power GPS-20 5V Version GPS-20 3.3V Version TTL TTL Main Power +5VDC±5% 3.3VDC±10% Supply Current 170mA Typical 170mA Typical Backup Power +2.5V to 3.3V +2.5V to 3.3V Backup Current 10µA Typical 10µA Typical Packup Period 230hr (9.6 days) 230hr (9.6 days) 1.3.3.3 Datum WGS 84 1.3.4 Performance 1.3.4.1 Acquisition 1) Tracks up to 12 satellites. 2) Update rate: 1 second. 3) Acquisition time Reacquisition
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GPS-20 Operating Manual Rikaline 1.3.5.3 DGPS Protocol Real-time Differential Correction input (RTCM SC-104 version 2.00 message types 1, 5 and 9). 2. Operational characteristics 2.1 Initialization As soon as the initial self-test is complete, the GPS-20 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
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GPS-20 Operating Manual Rikaline 3. Hardware interface 3.1 Connectors 3.1.1 Antenna Connector MCX, RSMA 3.1.2 Interface Connector 20-Pin and 10-Pin straight header, 2mm pitch 3.2 Pin Assignment of Connector Table 1-1 Pin list of the 20-Pin Digital Interface Connector (CN1) Pin Number Name Description 1 ANT_PWR Antenna DC Voltage 2 VCC_5V +5 DC Power Input 3 BAT Backup Battery 4 VCC_3V +3.3V DC Power Input 5 PBRES Push Button Reset Input. Active Low 6 GPIOA
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GPS-20 Operating Manual Rikaline 2) Pulled low (GND) through on-board 100K Ohm resister. 3.2.1 VCC_5V (+5V DC Power Input) This is the main DC power supply for a +5V-powered board. (Required for the GPS-20 5V version) 3.2.2 VCC_3V (+3.3V DC Power Input) This is the main DC power supply for a +3.3V-powered board. (Required for 3.3V version) 3.2.3 ANT_PWR DC voltage for an active antenna. This voltage is not required for operation with a passive antenna. The an
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GPS-20 Operating Manual Rikaline on. To achieve the faster start-up offered by a hot start or warm start, either a battery backup input must be connected or a recharge battery installed . Table 1-3 Backup Battery Voltage Range Board MIN MAX GPS-20 2.5 3.3 With a 3.3V Lithium-Ion (2.3mAh) rechargeable .To maximize battery lifetime (3~5 years), the battery voltage should not exceed 3.3V. 3.2.13 GPIO Functions Several I/Os of CPU are connected to the digital interfac
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GPS-20 Operating Manual Rikaline Tracking 220 170 160 CPU 360 33 29 Trickle 420 0.55 0.55 Note: Table 1-4 does not include the external antenna power, which must be controlled from the system power supply. 3.4 Push-to-Fix Description The purpose of Push-to-Fix mode is to support applications where a position fix is only required when requested by the user (or the application). To support this, the board is left in the Trikle state until commanded to generate a f
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GPS-20 Operating Manual Rikaline 3.6 Mechanical Drawing 3.6.1 Top View 3.6.2 Lateral View 3.6.3 Connector Model: GPS9540 Straight MCX 0 0 8 0 0.80 0 1 0 7 5 5.00 4.00 10 10.00 5.70 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.rikal
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GPS-20 Operating Manual Rikaline 4. Software Interface 4.1 NMEA Transmitted Messages The GPS-20 supported by SiRF Technology Inc. also outputs data in NMEA-0183 format as defined by the National Marine Electronics Association (NMEA), Standard. The default communication parameters for NMEA output are 4800 baud, 8 data bits, stop bit, and no parity. Table 4-1 NMEA-0183 Output Messages NMEA Record Description Global positioning system fixed data GPG
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GPS-20 Operating Manual Rikaline 4.1.2 Geographic Position with Latitude/Longitude (GLL) Table 4-4 contains the values for the following example: $GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C Table 4-4 GLL Data Format Name Example Units Description Message ID $GPGLL GLL protocol header Latitude 3723.2475 ddmm.mmmm N/S Indicator N N=north or S=south Longitude 12158.3416 dddmm.mmmm E/W Indicator W E=east or W=west UTC Position 161229.487 hhmmss.s
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GPS-20 Operating Manual Rikaline $GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71 $GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41 Table 4-8 GSV Data Format Name Example Units Description Message ID $GPGSV GSV protocol header Number of Messages 2 Range 1 to 3 Message Number 1 Range 1 to 3 Satellites in View 07 Range 1 to 12 Satellite ID 07 Channel 1 (Range 1 to 32) Elevation 79 degrees Channel 1 (Maximum 90) Azimuth 048 degr
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GPS-20 Operating Manual Rikaline Name Example Units Description Message ID $GPVTG VTG protocol header Course 309.62 DegreesMeasured heading Reference T True Course DegreesMeasured heading Reference M Magnetic (1) Speed 0.13 Knots Measured horizontal speed Units N Knots Speed 0.2 Km/hr Measured horizontal speed Units K Kilometers per hour Checksum *6E End of message termination (1) SiRF Technology Inc. does not support magnetic decli
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GPS-20 Operating Manual Rikaline 5. Earth Datums 5.1 Earth Datums The following is a list of the GPS-20 earth datum index and the corresponding earth datum name: Item Datum Reference Ellipsoid Data name 1 Adindan - Ethiopia Clarke 1880 Data1.dat 2 Afgooye – Somalia Krassovsky Data2.dat 3 Alaska, Conus – North American 1983 GRS 1980 Data3.dat 4 Albania – S-42 (Pulkovo 1942) Krassovsky 1940 Data63.dat 5 Argentina South American 1969 Data4.dat 6 Australia Australi
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GPS-20 Operating Manual Rikaline 51 Poland – S-42 (Pulkovo 1942) Krassovsky 1940 Data68.dat 52 Potsdam Bessel 1841 Data71.dat 53 Puerto Rico – Virgin Islands Clarke 1866 Data44.dat 54 Qatar national International Data45.dat 55 Qornoq – Greenland (SOUTH) International Data46.dat 56 Regional Mean South American 1969 Data48.dat 57 Reunion – Mascarene Islands International Data47.dat 58 Romania – S-42 (Pulkovo 1942) Krassovsky 1940 Data69.dat 59 Rome 1940 – Italy Interna
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GPS-20 Operating Manual Rikaline 6. Ordering Information 6.1 Product Options 6.1.1 Input Power GPS-20-5: 5V (Standard: TTL level, No backup battery) GPS-20-3: 3.3V (Standard: TTL level, No backup battery) 6.2 Accessories A-10302 Active Antenna, 2-Meter, MCX straight connector A-10302-A Active Antenna, 2-Meter, MCX 90° connector A-10305 Active Antenna, 5-Meter, MCX straight connector A-10305-A Active Antenna, 5-Meter, MCX 90° connec
