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Summary of Contents for Rikaline GPS-20
- Page 1 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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Page 2: Table Of Contents
6.2 Setting Syntax 6. Ordering Information 7.1 Product Options ………………………………………………………………………….……… 7.2 Accessories ……………………………………………………………………………………………… 8. Warranty Rikaline Marketing Corp. Tel: ++886 2 2934 5456 Fax: ++886 2 2934 4373 GPS-20 Operating Manual TABLE OF CONTENTS ……………………………………………………………….. ……………………………………………………………….… …..………………………………………………………………….…… ….……………………………………………………….… ………………………………………………………………… …………………………………………………….. …………………………………………………………………. ……………………………………………………..…... -
Page 3: Introduction
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. - Page 4 1.3.3.2 Power GPS-20 5V Version Main Power Supply Current Backup Power Backup Current Packup Period 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 0.1 sec., averaged...
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Page 5: Operational Characteristics
If significant inaccuracy exists in the initial data, or the orbital data is obsolete, it may take more time to achieve a navigation solution.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 GPS-20 Auto-locate feature is capable of automatically determining a navigation solution without intervention from the host system. -
Page 6: Hardware Interface
Table 1-2 Pin list of the 10-Pin Digital Interface Connector (JP1) Pin Number Note: 1) Pulled high (VCC/VDD) through on-board 100K Ohm resister. Rikaline Marketing Corp. Tel: ++886 2 2934 5456 Fax: ++886 2 2934 4373 GPS-20 Operating Manual Name Description ANT_PWR Antenna DC Voltage VCC_5V... -
Page 7: Time Mark
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... -
Page 8: Trickle Power Description
3.3 TricklePower Description The GPS-20 design includes all the functionality necessary to implement the SiRF TricklePower mode of operation. In this mode, the lowest average power dissipation is achieved by powering down the board (after a position is determined) in such a manner that when it is turned back on it can recomputed a position fix in the shortest amount of time. -
Page 9: Push-To-Fix Description
SiRF chip has an internal 1Mb SRAM for GPS task and OS kernel; besides, we have added an external 4 Mb (Can be expanded to 8Mb) for user storing codes. Rikaline Marketing Corp. Tel: ++886 2 2934 5456 Fax: ++886 2 2934 4373 GPS-20 Operating Manual 0.55 5F-1, 125, Roosevelt Road, Sec. 5, Taipei, Taiwan 116 E-Mail: info@rikaline.com.tw 0.55... -
Page 10: Mechanical Dimension
3.6.3 Connector Model: GPS9540 Straight MCX 0.80 5.00 4.00 10.00 5.70 Rikaline Marketing Corp. l: ++886 2 2934 5456 Fax: ++886 2 2934 4373 GPS-20 Operating Manual 5F-1, 125, Roosevelt Road, Sec. 5, Taipei, Taiwan 116 E-Mail: info@rikaline.com.tw Rikaline web: www.rikaline.com.tw... -
Page 11: Software Interface
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. - Page 12 4.1.4 GNSS Satellites in View (GSV) Table 4-8 contains the values for the following example: Rikaline Marketing Corp. Tel: ++886 2 2934 5456 Fax: ++886 2 2934 4373 GPS-20 Operating Manual Units GLL protocol header ddmm.mmmm N=north or S=south dddmm.mmmm E=east or W=west hhmmss.sss...
- Page 13 Table 4-10 contains the values for the following example: $GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E Table 4-10 VTG Data Format Rikaline Marketing Corp. Tel: ++886 2 2934 5456 Fax: ++886 2 2934 4373 GPS-20 Operating Manual Units GSV protocol header Range 1 to 3 Range 1 to 3 Range 1 to 12...
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Page 14: Rtcm Received Data
The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no parity. Position accuracy of less than 5 meters can be achieved with the GPS-20 by using Differential GPS (DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 5, or 9. As using DGPS receiver with different communication parameters, GPS-20 may decode the data correctly to generate accurate messages and save them in battery-back SRAM for later computing. -
Page 15: Earth Datums
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 Adindan - Ethiopia Afgooye – Somalia Alaska, Conus – North American 1983 Albania – S-42 (Pulkovo 1942) -
Page 16: Setting Syntax
Change Datum to WGS84, Sirfprog /Fdata58.dat –P1 –B4800 –Csh1 <Entry> After changing datum, the new datum will be kept in SRAM. If no power supplied to GPS-20 for more than 9 days, user must re-set datum when power on. Rikaline Marketing Corp. -
Page 17: Ordering Information
Active Antenna with other connector is produced on demand. 7. Warranty The GPS-20 is warranted to be free from defects in material and functions for one year from the date of purchase. Any failure of this product within this period under normal conditions will be replaced at no charge to the customers.
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