Globalsat EM-506 [8/17] Gsa gnss dop and active satellites

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GSA - GNSS DOP and Active Satellites

Table B-5 contains the values for the following example:

$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33

Table B-5 GSA Data Format

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode 1 A See Table B-6

Mode 2 3 See Table B-7

Satellite Used

07 Sv on Channel 1

Satellite Used

02 Sv on Channel 2

…..

Satellite Used

Sv on Channel 12

PDOP

1.8 Position dilution of Precision

HDOP

1.0 Horizontal dilution of Precision

VDOP

1.5 Vertical dilution of Precision

Checksum *33

<CR><LF> End of message termination

1. Satellite used in solution.

2. Maximum DOP value reported is 50. When 50 is reported, the actual DOP may be much larger.

Table B-6 Mode1

Value Description

M Manual-forced to operate in 2D or 3D mode

A 2Dautomatic-allowed to automatically switch

Table B-7 Mode 2

Value Description

1 Fix Not Available

2 2D (<4 SVs used)

3 3D (>3 SVs used)