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 GPS
Module: CW55 Network Assistance Basestation
Description
The CW55 Network Assistance Base Station is an
integrated module designed specifically to output
time and ephemeris data that allows assisted GPS
operation of the CW25 GPS receiver. The CW55
provides assist data in a usable format for
tracking CW25 receivers in less-than-optimal GPS
environmentsÂsuch as indoors or in other areas of restricted GPS coverage.
The CW55 is a complete stand-alone module with
integral DC/DC PSU and serial port, requiring
only an external GPS antenna with a clear view of
the sky. This use of this base station is
intended for applications where tracking CW25 GPS
receivers have a limited of the sky. The base
station outputs the assist data over an RS232 serial port.
For versions of the base station for applications
that require greater distances between the base
station and tracking CW25 receivers OR for
versions that include other communications
modems, such as GSM/GPRS, please contact NavSync.
Features
- Easy to use complete Network Assistance Base Station
- Includes all required user peripherals (RS232)
- Includes all manuals and software
Block Diagram
CW55 Network
Assist Message Format
These messages are a series of ASCII comma
separated messages, output from UART3 of CW55
Network Assist Base Station 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 a character followed by an 8-bit accumulative
checksum of all bytes in between the # and the &
characters in represented in ACSII hexadecimal.
For simplicity, the messages that contain data
normally transmitted in the GPS satellite\u2019s
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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