Globalsat ET-314 GPS Engine Board Инструкция по эксплуатации онлайн [19/22] 88447

ET-314AC

High Performance GPS Engine Board

2010/4/1

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Table B-8 LLA Navigation Initialization Data Format

Name Example Unit Description

Message ID $PSRF104 PSRF104 protocol header

Lat 37.3875111 degrees Latitude + = North (Range 90 to -90)

Lon -121.97232 degrees Longitude + = East (Range 180 to -180)

Alt 0 meters Altitude position

ClkDrift 96000 Hz Clock Drift of the Receiver1

TimeOfWeek 237759 sec GPS Time Of Week

WeekNo 1946 Extended GPS Week Number

ChannelCount 12 Range 1 to 12

ResetCfg 1 See Table B-9

Checksum *07

<CR> <LF> End of message termination

Use 0 for last saved value if available. If this is unavailable, a default value of 96,250 Hz is used.

Table B-9 Reset Configuration Bit Map

Bit Description

0☆

Data valid flag: 1 = Use data in ECEF X, Y, Z, Clock Offset, Time of Week and Week

number to initialize the receiver; 0 = Ignore data fields

1 Clear ephemeris from memory: blocks Snap or Hot Start from occurring

2 Clear all history (except clock drift) from memory: blocks Snap, Hot, and Warm Starts

3 Factory Reset: clears all GPS memory including clock drift. Also clears almanac stored

in flash memory

Enable Nav Lib data (YES = 1, NO = 0) ★

☆ For software that does not support initialized data (GSW3, GSWLT3, SiRFXTrac) setting this

bit may cause unpredictable results. Do not attempt to use initializing data.

★ If Nav Lib data are enabled, the resulting messages are enabled: Clock Status (Message ID 7),

50BPS (Message ID 8), Raw DGPS (Message ID 17), NL Measurement Data (Message ID 28),

DGPS Data (Message ID 29), SV State Data (Message ID 30), and NL Initialized Data

(Message ID 31). All messages sent at 1 Hz. If SiRFDemo is used to enable Nav Lib data, the

bit rate is automatically set to 57600 by SiRFDemo.