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GPS Orion
12 Channel GPS Receiver Design Product Brief
DS4808 - 1.3 August 1997
The GPS Orion is an evaluation kit to demonstrate the capability of the Mitel Semiconductor GP2000 Global Positioning chip set. It is a fully functional GPS receiver design which provides full 12 channel parallel tracking hardware and software for GPS system integrators and designers of GPS receiver subsystems. This new approach offers a complete GPS receiver `engine' design with the design information being freely available, providing the ability to integrate GPS with dedicated IC components. This allows wider design flexibility and lower cost solutions than using third-party modulebased receivers. It enables the GP2000 chipset to be evaluated in real applications.
FEATURES I Small board size - 95 mm x 50 mm I 12 channel GPS Receiver architecture I Highly integrated miniature silicon Front-end IC I Low cost 12 Channel Correlator IC I 32 bit RISC processor with spare processing I Easy to embed into host systems I Non-volatile data retention I Supported by Development System (GPS Architect)
with access to GPS software source code at minimal cost The GPS Orion comprises two boards : a GPS Receiver board, and an Interface board. The Receiver board is based on the GP2000 chip set plus complementary components which make a complete GPS Receiver. The Interface board provides power and data conditioning interfaces to peripheral equipment, and long term memory backup. GPS Receiver Board The GPS Orion receiver architecture uses integrated circuits manufactured by Mitel Semiconductor. The GP2000 chipset comprises the GP2015 RF downconverter, the DW9255 35.42MHz (2MHz BW) IF SAW filter, the GP2021 correlator IC, and the 32-bit ARM60 RISC processor. The use of a GP2015 RF downconverter offers good immunity from out-of-band noise, especially when used with the DW9255 surface mount SAW filter as a 2nd IF filter. The design offers superior RF performance with a high degree of noise rejection from digital sources. The 2-bit sampled IF, in conjunction with triple-conversion architecture provides bestin-class RF jamming resistance. The GP2021 12 channel correlator can be used to track C/A code for the Standard Positioning Service. Any channels not used can be deselected to save power. The digital interface is compatible with most 16 or 32-bit processors and the IC includes interface logic to allow it to be easily coupled to the ARM60 32 bit RISC processor.
Fig.1 GPS Orion Receiver Board with Interface Board
The ARM60-B 32-bit RISC microprocessor offers high instruction throughput and fast real-time interrupt response. The ARM60 offers superior performance for 12 channel processing, which is important for applications such as vehicle tracking and automotive applications. Interface Board The Interface board provides those functions which would normally be included elsewhere in a GPS system. These functions include : voltage regulation, battery back-up (1000 hours memory retention), and serial interfaces to output the information and to input commands and DGPS correction data. Software The software for GPS Orion is stored in EPROM and is self-booting. The software provides many facilities including: NMEA 0183, or proprietary WINMON data interfaces Navigation position filtering Satellite Almanac and Ephemeris save and upload Reliable satellite tracking RTCM SC-104 Differential Correction input Data Retention The Receiver board includes a supercap (0.22 F) which gives approximately 4 hours retention of volatile data (position, satellite ephemerides, etc.) in isolation from the Interface board. The Interface board includes a rechargeable battery giving approximately 1,000 hours data retention.
GPS Orion PRODUCT BRIEF
RELATED PRODUCTS
Part No DW9255 GP2010 GP2015 GP2021 ARM60 GPS Architect Description 35.42 MHz SAW Filter GPS RF Front End GPS RF Front End in TQFP package 12 Channel Correlator 32 Bit RISC Processor 12 Channel GPS Development System Data Sheet Reference DS3861 DS4056 DS4374 DS4077 DS4004 DS4605
Fig.2 GPS Orion Architecture
OUTLINE SPECIFICATION
RECEIVER CHARACTERISTICS GENERAL: L1 frequency (1575.42MHz), C/A code direct-sequence spread-spectrum, 12 parallel channel continuous-tracking receiver, using 2-bit digital quantization. WGS-84 only 25 metres Spherical Error Probability (SEP); 100 metres (2D Root Mean Square) with S/A active. 3 metres SEP, with S/A active. Typical 105 seconds 11 seconds 90% <165 seconds <60 seconds <15 seconds
DATUM: POSITION ACCURACY: (standard) POSITION ACCURACY: (DGPS) TIME-TO-FIRST-FIX (TTFF - Ref Notes) G Cold start: G Warm start: G Hot start: RE-ACQUISITION AFTER SIGNAL LOSS: ANTI-JAMMING RESISTANCE:
< 2 seconds (90%) -20dBm CW to within 7.5MHz of L1 (for <3dB degradation in GPS SNR).
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GPS Orion PRODUCT BRIEF
DATA I/O WINMON MODE: (J2 socket) NMEA MODE: (J2 socket) Proprietory GEC-Plessey Semiconductors ASCII interface protocol. Full input/output interface, controlling all user-definable options. 19200 baud, 8-bits, No Parity, 1 stop bit. NMEA 0183 V2.01 with GGA, RMC, GSV & GSA (output only - not configurable). 4800 baud, 8-bits, No parity, 1 stop bit. Receiver configuration is still available in NMEA mode, by using WINMON UPDATE RATE: RTCM DIFFERENTIAL CORRECTIONS: (J1 socket) command protocol at 4800 baud, 8-bits, No parity, 1 stop bit. 1 per second (both modes) RTCM SC-104 (input only) - message types 1, 2 & 9-3 9600 baud, 8-bits, No Parity, 1 stop bit
PHYSICAL CHARACTERISTICS - GPS ORION RECEIVER BOARD PRIME POWER: Vdd into receiver board EXTERNAL BACKUP POWER: Vdr ACTIVE-ANTENNA POWER: POWER CONSUMPTION: Vdd MEMORY/RTC BACKUP POWER CONSUMPTION: Vdr INSTALLED SUPERCAP BACKUP LIFE: DATA I/O LEVELS: SIZE: (GPS Orion Receiver Board only) SIZE: (with GPS Orion Interface Board attached) CONNECTORS: +5 volts DC, +/- 10% >+2.2 volts DC, <+5.5volts DC +5 volts DC available GPS Receiver Board only: 370mA 1.85W With Antenna: 395mA 1.98W 60A @ Vdr > +2.2volts DC 4 hours approx. CMOS TTL levels (0v & +5v) 95mm x 50mm x 20mm (with RF connector) 95mm x 50mm x 12mm (no RF connector) 95mm x 50mm x 30mm RF: SMA socket I/O: 9-pin (1 x 9), 0.1" pitch plug
PHYSICAL CHARACTERISTICS - GPS ORION INTERFACE BOARD INPUT POWER SUPPLY: MEMORY / RTC BACKUP BATTERY: BATTERY CHARGE G RATE: G TOTAL RECHARGE TIME: BATTERY BACKUP LIFE (when supplying Vdr pin on GPS Orion receiver board): DATA I/O LEVELS: OUTPUT DATA-MODE CHANGE: SOFT RESET: CONNECTORS: +8 volts to +30volts DC +3.6 v NiCad, 110mAhrs 7.5mA typical 18 hours approx. 8 weeks approx. RS232 levels (10v) Slide switch Push button I/O to Orion: 9-pin (1 x 9), 0.1" pitch socket Power: 2.5mm power socket (centre positive) RS232: 2 x 9 pin D-type plug ENVIRONMENTAL CHARACTERISTICS (RECEIVER BOARD ONLY) OPERATING TEMP: STORAGE TEMP: -40C to +85C -50C to +110C
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GPS Orion PRODUCT BRIEF
NOTES: 1) COLD START:A cold start results when there is no valid Almanac or Ephemeris information available for the satellite constellation in SRAM, or when the time and/or position information is NOT known (i.e starts at 0 in both cases). Also a cold start will be initiated if an Almanac is valid, but a fix cannot be achieved within 10 minutes of power-up. This could occur if the receiver position has moved significantly since it was last powered-up, but the position change and time are NOT initialised by the user 2) WARM START:- A warm start results when there is a valid Almanac, and the initial time and position are known in SRAM, but the ephemeris is NOT valid (i.e more than 4 - 6 hours old). 3) HOT START:A hot start results when there is a valid Almanac, valid ephemeris (i.e. less than 4 - 6 hours old), and when accurate time and position information are also known in SRAM (position error less than 100km, time error less than 5 minutes). This can be simulated by a momentary Soft-Reset (i.e. press the push-button on the GPS Orion interface Board).
Next step The GPS Architect is available for designers who wish to develop the software further. This software, which supports the GP2000 chipset is available in both executable and source format, and is available for modification and/or embedding into the target application. Purchase of a GPS Architect Development System provides optimum flexibility and control in the design approach demonstrated by the GPS Orion, and includes a licence to modify the software and use it in embedded form with the target application.
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M Mitel (design) and ST-BUS are registered trademarks of MITEL Corporation Mitel Semiconductor is an ISO 9001 Registered Company Copyright 1999 MITEL Corporation All Rights Reserved Printed in CANADA TECHNICAL DOCUMENTATION - NOT FOR RESALE

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