C-Nav3050 User Guide

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C-Nav3050 User Guide | Manualzz

C-Nav3050 User Guide

NMEAGFA (ASCII)

This sentence is used to report the results of the data quality check associated with a position solution. If only a single constellation (GPS, GLONASS, etc.) is used for the reported position solution, the talker ID is GP, GL, etc. and the data pertain to the individual system. If satellites from multiple systems are used to obtain the reported position solution, the talker ID is GN and the parameters pertain to the combined solution. This provides the quality data of the position fix and is associated with the GNS sentence. This sentence is in compliance with

NMEA-0183 Standards version 3.0.

Output

Format:

$xxGFA,UTC,HPL,VPL,Std_X,Std_Y,Theta,Std_H,SAL,IntStatus*c hecksum

Field#

Field

Name

Description

F1

F2

F3

F4

F5

F6

UTC

HPL

VPL

Std_X

Std_Y

Theta

UTC time of the associated GGA or GNS fix

(hhmmss.ss)

Horizontal protection levels in meters (xxxx.x).

Vertical protection levels in meters (xxxx.x)

Standard deviation of semi-major axis of error ellipse in meters (xxx.xx)

Standard deviation of semi-minor axis of error ellipse in meters (xxx.xx)

Orientation of semi-major axis of error ellipse (xxx.xxxx degrees from true north)

Standard deviation of altitude in meters (xxx.xx)

Selected accuracy level in meters (xxxx.x)

F7

F8

Std_H

SAL

F9

F10

Revision

10

IntStatus

Integrity status:

The integrity status field is a variable length character field which indicate the status of the various integrity sources. This field shall not be Null.

V= Not in use

S= Safe (when integrity is available and Horizontal

Protection Limit (HPL) < Horizontal Alert Level (HAL)

C= Caution (no integrity is available)

U= Unsafe (when integrity is available and HPL >

HAL)

Checksum

Table 37: GFA Message Output Format

Page 116 of 186 6/8/2015

C-Nav3050 User Guide

Example:

$GNGFA,224229.00,0001.7,0002.9,000.43,000.22,014.4868,000.83,0010.0,SCC*0C

In RTK mode, fields F2, F3, F4 and F5 are zeroes. They are correct values since RTK provides very accurate solutions, beyond the resolution provided by the NMEA standard

Revision

10

Page 117 of 186 6/8/2015

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