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GPS
Module: CW55 Network Assistance Basestation

Description
The CW55 Network Assistance Basestation is a complete module specifically
designed to output time,
frequency and ephemeris data that allows assisted GPS operation of the
CW55 GPS receiver. The basestation is developed from a specialized version
of the CW55 receiver that is designed to output the
required assist data in a format required by the tracking CW55 receivers.
The basestation is a complete stand alone module with integral DC/ DC
PSU and serial port and only requires an external GPS aerial with a
clear view of the sky. The use of this basestation is restricted to
applications where the tracking CW55 GPS receivers have a similar view
of the sky as the basestation (for applications that require greater
distances between the basestation and tracking CW55 GPS receivers, please
contact NavSync). The basestation outputs the assist data over an RS232
serial port or USB port, and for versions of the basestation that include
other communication modems, such as GSM/GPRS,please contact NavSync.
Applications
- Easy to use complete Network Assistance Basestation
- Includes all required user peripherals (RS232 and USB)
- Includes all manuals and software
- For basestation versions with GSM/GPRS, please contact NavSync
Block Diagram

CW55 Network
Assist Message Format
These messages are a series of ASCII comma separated messages which
are output from UART3 of the CW55 Network Assist Basestation at 38,400,8,N,1.
Each message starts with a # character and ends with a <CR><LF>.
Prior to the end of the message there is an & character followed
by an 8-bit accumulative checksum of all bytes in-between the # and
& characters in represented in ASCII hexadecimal. For simplicity,
the messages which contain data normally transmitted in the GPS satellite’s
Navigation Messages, contain the data formatted and scaled as closely
as possible to it.
The data messages output are as follows;
- #WTP, Week, Time, Position Message
- #EPH, Ephemeris Subframe Message
- #ALM, Almanac Subframe Message
- #KLB, Klobuchar Ionospheric Parameters Message
- #UCP, UTC Correction Parameters Message
- #TIM, Time Input Message
- #LOC, Location Message
CW55 Product Brief
Ver 3.0 Date: 8/11/04
Copyright © 2004 NavSync Ltd.
All Rights Reserved Specifications subject to change without notice.
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