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SPSx51 Modular GPS Receivers User Guide     

GSOF Messages     

Signal-to-noise ratio (SNR) of L1 signal

Signal-to-noise ratio (SNR) of L2 signal

This message describes current time information. It contains the following data:

GPS time, in milliseconds of GPS week

GPS week number

GPS to UTC time offset, in seconds

Table B.12

SV detail (Type 14 record)

0

Output record 
type

Char

0Eh

Detailed satellite information output record

1

Record length

Char

1 + 8×(number of SVs)

Bytes in record

2–9

Number of SVs

Char

00h-18h

Number of satellites included in record

1

1

Includes all tracked satellites, all satellites used in the position solution, and all satellites in view.

The following bytes are repeated for Number of SVs

PRN

Char

01h-20h

Pseudorandom number of satellites (1–32)

Flags1

Char

See Table B.21

First set of satellite status bits

Flags2

Char

See Table B.22

Second set of satellite status bits

Elevation

Char

Degrees

Angle of satellite above the horizon

Azimuth

Short

Degrees

Azimuth of satellite from True North

SNR L1

Char

dB * 4

Signal-to-noise ratio of L1 signal (multiplied 
by 4)

2

2

THe SNR L1 and SNR L2 items are set to zero for satellites that are not tracked on the current frequency.

SNR L2

Char

dB * 4

Signal-to-noise ratio of L2 signal (multiplied 
by 4)

2

Table B.13

UTC (Type 16 record)

0

Output record type

Char

10h

1

Record length

Char

09h

Bytes in record

2–5

GPS millisecond of 
week

Long

msecs

Time when packet is sent from the receiver, in GPS 
milliseconds of week

6–7

GPS week number

Short

number

Week number since start of GPS time

8–9

UTC offset

Short

seconds

GPS to UTC time offset

10

Flags

Char

See 

Flag bits indicating validity of Time and UTC offsets