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Rikaline GPS-24 / 24A
GPS Receiver Board
User’s Guide
Nemerix V1.0 Feb 28, 2005
Rikaline International Corp.
10F, 64, Kang-Ding Road, Taipei 108, Taiwan, R.O.C.
Phone: +886-2-2370-4688 Fax: +886-2-2370-4686
E-Mail: info@rikaline.com.tw Web: www.rikaline.com.tw
All Right Reserved
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 1. Introduction 1.1 Overview The Rikaline GPS-24 / 24A is a GPS receiver board featuring Nemerix low power architecture. This complete enabled GPS receiver board provides high position and speed accuracy performances as well as high sensitivity and tracking capabilities in urban canyon conditions. The solution enables small form factor package. The GPS-24 / 24A delivers ma
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Tracking: -152dBm Acquisition: -139dBm 3) Acquisition time: Reacquisition 0.1 sec. (90%) Hot start 12 sec. (90%) Warm start 38 sec. (90%) Cold start 60 sec. (90%) 4) Position accuracy: Non DGPS (Differential GPS) Position <7m CEP (90%) with S\A off Velocity 0.1 meters/second. Time 1 microsecond
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 2. Operational characteristics 2.1 Initialization As soon as the initial self-test is complete, the GPS-22 begins the process of satellite acquisition and tracking automatically. Under normal circumstances, it takes approximately 120 seconds to achieve a position fix, 42 seconds if ephemeris data is known. After a position fix has been calculated, information about valid p
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 3. Hardware interface 3.1 Physical Characters 1. Size: 25.9(W) x 25.9(D) x 2.7(H) (mm) 2. Weight: 25 g 1.02”(W) x 1.02”(D) x 0.11”(H) 3.1.1 Details Drawing 3.1.1.1GPS-24 (to be equipped with active antenna only) 1// Antenna connector: 1.27 mm pitch, 3 pin board to board 2// Interface connector: 1.27 mm pitch, 10 p
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 3.2 Pin Definition PIN NAME TYPE DESCRIPTION Remarks 1 GPIO(4) I \ O GPS Status 2 NC (MODE) NU Reserved, keep float 3 NMEA Tx I \ O NMEA Serial Data Output 4 NMEA Rx I \ O NMEA Serial Data Input 5 NC (WAKE UP) NU Reserved, keep float 6 Reset I Low Active, keep float if not use *1 Will not effect hot, or cold start 7 VBAT I Backup Battery Input (1.2~2V) 8 GND PWR Grou
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Table 3-3 Backup Battery Conditions Parameter Symbol Min Typ Max Units RTC(Battery) Power BAT 1.2 1.8 2 V Supply Current 10 µA Table 3-4 DC Characteristics Parameter Symbol Min Max Units Input High Level Vih 2.5 3.5 V Input Low Level Vil 0 0.8 V Output High Level Voh 2.4 3.4 V Output Low Level Vol 0 0.4 V Input Leakage Current Li 2 2 µA
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 4. Software Interface The GPS-24 / 24A interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC Ⅱ interface specification, which is defined in NMEA 0183, Version 3.0 and the Radio Technical Commission for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service, Version 2.1, RTCM Special Committee No.104). 4.1 NM
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 5. Ordering Information 5.1 Products Options 5.1.1 GPS Receiver Module GPS-24 Standard with TTL level. GPS-24-A Standard with TTL level, and available to attach patch antenna on top of the board. 5.2 Accessories A-10302-M Active Antenna, 2M, MMCX connector. A-10305-M Active Antenna, 5M, MMCX connector. 6. Warranty The GPS-24 /
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Appendix A Software Interface The GPS-24 / 24A interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC Ⅱ interface specification, which is defined in NMEA 0183, Version 3.0 and the Radio Technical Commission for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service, Version 2.1, RTCM Special Committee No.104).
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Table 4-4 contains the values for the following example: $GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C Table A-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 hhm
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 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 degrees Channel 1 (True, Range 0 to 359) SNR (C/No) 42 dBHz Range 0 to 99, null when not tracking .... .... Satellite ID 27 Channel 4 (Range 1 to 32) Elevation 27 degrees Channel 4 (Maximum 90) Azimuth 138
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline A.1.7 Time & Date (ZDA) Table A-11 contains the values for the following example: $GPVTG,114523.62,12,04,2001,10,34*6E Table A-11 ZDA Data Format Name ExampleUnits Description Message ID $GPZDA ZDA protocol header Hour, Min, Sec, Sub 114523.62 Hhmmss.ss Sec Day 12 Day in UTC, 01to 12 Month 04 Month in UTC, 01 to 12 Year 2001 Year in UTC Local Zone H
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Appendix B Reference Design Specifications subject to change without prior notice Rikaline International Corp. 10F, 64, Kang-Din Road, Taipei 108, Taiwan Tel: ++886 2 2370 4688 Fax: ++886 2 2370 46
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Appendix C Developer’s Setting For all $PNMRX messages, it is possible to configure an alternative string to replace the NMRX part, the node always responds to the $PNMRX strings and can be configured to generate and respond to the alternative string. C.1 $PNMRX100, Set serial port mode This message is sent to control the serial communications port parameters. The $P
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline C.3 $PNMRX103, NMEA rate control This message is being sent to enable or to disable the output of an NMEA message and to determine its output rate. The sequence of the output sequence is determined by the $PNMRX107 message. The $PNMRX103 message format is shown below. The rate of each message can individually be set. If ‘0’ is used, the output of the message is skipped (accord
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline C4.5 $PNMRX106, Datum This message defines the conversion model used for mapping the ECEF coordinates into the LLA ones. The default transformation uses WGS84 approximation. The transformation method can be changed into one using a reference Ellipsoid combined with a local datum, to obtain a specific estimation of the local earth geometry. Once the datum has been changed it wi
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Mode Int 1 1 0 Disable message 1 Send message now 2 Send message on change 3 Send message now and on change Checksum *xx (0) 3 3 2 digits. Message 2 2 ASCII 13, ASCII 10. terminator Examples: $PNMRX107, 300, 1*xx: Output the almanac stored in NVRAM $PNMRX107, 301, 2*xx: Output Ephemeris will be output on change $PNMRX107, ALL, 2*xx: Output all ZX4120 output me
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline 1 3 Maximum VDOP Unsigned 4 x10, [0-100] 4 Minimum SNR Unsigned 2 dB/Hz, [20-45] 5 Minimum Elevation Unsigned 2 Degrees, [0-90] 6 Noise Floor Unsigned 4 -, [400-1000] 1 7 Navigation Mode 1 Unsigned 1 1 = Auto (hold alt) 2 = 2D Mode 4 = 3D Mode (calc alt) 1 8 2D Mode Altitude Unsigned 6 Meters above MSL 1 9 Navigation Mode 2 Boolean 1 0 = Auto 1 = Static 10 Maximu
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GPS Receiver Board GPS-24 / 24A Operating Manual Rikaline Field Format Min Max Notes chars chars Message ID $PNMRX112 6 8 PNMRX112 protocol header. Operating Mode Into 1 1 0 = Fully Active 1 = LDCM1 OFF period Into 1 2 RF off time in seconds [5:10] Checksum *xx (0) 3 3 2 digits. Message 2 2 ASCII 13, ASCII 10. terminator Examples: $PNMRX112, 1, 5*xx: enable low power mode (with 5 seconds off time between 2 fixes)
