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1. CW46 GPS Sensor Description The CW46 GPS sensor is a fully integrated module that includes the CW25 GPS receiver DC DC converter RS232 RS422 and USB interface options and active GPS antenna all housed in a small weatherproof IP67 rated enclosure The CW25 GPS receiver at the center of the CW46 sensor has been designed specifically for acquiring and tracking satellites in weak signal areas such as under dense foliage severe urban canyons and even inside buildings The CW46 can acquire satellites at signal levels down to 155dBm with network assisted ephemeris data and track satellites down to 155dBm The CW46 can also autonomously acquire satellites at signal levels as low as 143dBm The CW46 utilizes the CW25 TIM GPS Applications receiver inside allowing the CW46 to act as a complete timing module capable of outputting a GPS disciplined frequency up to 10 MHz that can achieve full PRC MTIE performance in good signal areas The CW46 can also continue to provide synchronization in very weak signal areas including inside buildings which will dramatically reduce installa tion costs For example many environments require high placement i e 40 ft of the GPS antenna to ensure a clear view of satellites The CW46 eliminates this need and cost through its low signal strength tracking capabilities GPS Receiver e Synchronization e iming e In Building Timing e Urban Canyon Installations e Remote S2. al Cable RG 174 Coaxial Cable RG174 SSE Vin _ HA Ey Derr un aigein Tend Cable Shield Tx i Rxi D Iype connector O OOOO a a eee a a O amp Description NMEA 0183 output from GPS Core Refer to CW25 User Manual for description of proprietary messages The Baud rate is up to 38400 and the default is 38400 NMEA 0183 input to GPS Core Refer to CW25 User Manual for description for proprietary commands Cable shield GND Boot Select pin allows Firmware to be upgraded when pulled low i e tie to Gnd Wire before power up Voltage Supply Input 5V 18V DC to be supplied here Power supply return to ground 1 Pulse Per Second output Pulse is 100uS in duration and rising edge signifies top of second Programmable synchronized frequency output from GPS core this frequency is 10MHz by default but may be changed by sending a NMEA command The period of the output frequency must be a multiple of 100ns See CW25 User Manual for details ma Copyright 2004 Navsync Ltd All Rights Reserved Specifications subject to change without notice CW46 RS232 CABLE OVERVIEW amp SETUP INSTRUCTIONS ahs slit evliun P d Out t i Fa Data Setup Instructions Place the CW46 where it has a good view of the sky Attach Bulgin Data Connector to CW46 Connect RS232 Socket to PC Apply Power Supply Voltage between the Red ive and Black ive unterminated wires Data sho
3. ite Locations Block Diagram Microprocessor GPS Antenna Communications RS232 RS422 1 USB etc Positional Data NAvsync CW46 GPS SENSOR SPECIFICATIONS SPECIFICATIONS Physical Module dimensions 101mm length x 91mm width x 43mm height Module Rating IP67 Supply voltage 5 18V DC Operating Storage Temp 40 C to 75 C 55 C to 125 C Humidity 5 to 95 non condensing Max Velocity Altitude 515ms 18 000m Max Acceleration Jerk 4g 1gs sustained for less than 5 seconds Sensitivity Acquisition Tracking 185dBW 185dBW Acquisition Hot Start with network assist Outdoor lt 2s Time Indoor 185dBW lt 5s Stand Alone Outdoor Cold lt 45s Warm lt 38s Hot lt 5s Re acquisition lt 0 5s 90 confidence Accuracy Position Outdoor Indoor lt 5m rms lt 50m rms Velocity lt 0 05ms Latency lt 200ms Raw Measurement Accuracy Pseudorange lt 0 3m rms Carrier phase lt 5mm rms Tracking Code and carrier coherent Power 1 fix per second 0 6W typically dependant of software build Sleep Standby Current 1mA 1uUA Interfaces Serial RS232 RS422 and USB programmable baud rate up to 38400 Protocols Network Assist NMEA 0188 Proprietary ASCII and binary message formats 1pps Timing Output 30ns rms accuracy lt 5ns resolution Event Input 30ns rms accuracy lt 10ns resolution Frequency Output 10 Hz to 10 MHz Receiver Type 12 parallel channel x 32 taps up to 32 point FFT Channels tap
4. s and FFT can be switched off to minimize power or simulate simpler designs General Processor ARM 966E S on a 0 18 micron process at up to 120 MHz ma Copyright 2004 Navsync Ltd All Rights Reserved Specifications subject to change without notice CW46 GPS MTIE PERFORMANCE The graph below demonstrates the MTIE performance of the CW46 output frequency relative to a Caesium atomic clock with the CW46 operating with a clear view of the sky MTIE Fo 10 00 MHz Fs 1 000 Hz 11 19 03 05 45 08 PM 11 20 03 09 08 18 AM HP 53132A Test 545 10 MHz NCO Samples 55388 Gate 1 s Ref ch2 10 00 MHz Tl Time Data Only TI 1 gt 2 Observation Window T au The graph below demonstrates the ability of the CW46 to continue to provide a GPS disciplined output frequency with the GPS aerial located completely inside a building the degradation of MTIE perfor mance is due to the effects of signal multi path MTIE Fo 10 00 MHz Fs 999 0 MHz 2 12 04 02 38 18 PM 2 12 04 05 50 27 PM HP 53132A Test 589 CW25 _indoor_tim Samples 11506 Gate 1 s Ref ch2 10 00 MHz Tl Time Data Only TI 1 gt 2 nsec 1 001 Observation Window Tau Copyright 2004 Navsync Ltd All Rights Reserved Specifications subject to change without notice IN AV Ji CW46 RS232 CABLE DIAGRAM Sma Plugs BULGIN CONNECTOR Pin Name I O 1 TXD O 3 RXD 5 GND PWR 7 BOOTSEL 9 VCC PWR 10 GND PWR SMA 1PPS O 1 SMA FREQ OUT O 2 Coaxi
5. uld start to stream Wait for GPS lock Once GPS lock is achieved the 10MHz output frequency and the 1PPS signals will become available from the SMA connections on the underside of the CW46 unit The SMA cables that were received with the unit should be attached to these Ot ae ee ie Copyright 2004 Navsync Ltd All Rights Reserved Specifications subject to change without notice NAVSYNC CW46 GPS Sensor NavSync Ltd Headquarters Bay 143 Shannon Industrial Estate Shannon Co Clare Ireland Phone 353 61 475 666 E mail sales navsync com In North America 2111 Comprehensive Drive Aurora IL 60505 USA Phone 630 236 3026 E mail northamerica navsync com Www navsync com
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