SATVIS2

Satellite visibility

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

This log contains satellite visibility data for all available systems with additional satellite and satellite system information. One log is output for each available satellite system.

 

  1. The SATVIS2 log is meant to provide a brief overview. The satellite positions and velocities used in the computation of this log are based on Almanac orbital parameters, not the higher precision Ephemeris parameters.

  2. In the SATVIS2 log output, there may be double satellite number entries. These are GLONASS antipodal satellites in the same orbit plane separated by 180 degrees latitude. Refer to the GLONASS section of An Introduction to GNSS available on our website at novatel.com/an-introduction-to-gnss.

  3. The SATVIS2 log data is re-computed at a minimum of every 10 seconds. It will also be re-computed asynchronously as new navigation data is downloaded in the receiver. If the log is requested at a faster rate than ontime 10, it will be output at the requested rate, but may not contain newly computed data.

Message ID: 1043

Log Type: Asynch

Recommended Input:

log satvis2a ontime 10

Abbreviated ASCII Example:

<SATVIS2 USB1 6 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     GPS TRUE TRUE 31

<          29 0 73.9 298.1 1006.524 1006.471

<          5 0 63.2 127.7 829.350 829.298

...

<          21 0 -78.0 245.7 1008.686 1008.634

<          1 0 -82.3 91.7 -329.712 -329.765

 

<SATVIS2 USB1 5 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     GLONASS TRUE TRUE 24

<          18-3 0 63.2 47.6 -1112.813 -1112.867

<          19+3 0 52.6 301.3 1883.220 1883.167

...

<          7+5 0 -57.3 300.1 -1966.130 -1966.184

<          22-3 0 -74.8 221.7 612.703 612.650

 

<SATVIS2 USB1 4 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     SBAS TRUE FALSE 4

<          131 0 31.6 183.8 0.016 -0.036

<          138 0 31.4 171.3 0.017 -0.035

<          135 0 30.7 194.0 0.014 -0.038

<          133 0 30.0 199.2 0.013 -0.039

 

<SATVIS2 USB1 3 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     GALILEO TRUE TRUE 23

<          34 0 69.1 59.8 -928.064 -928.116

<          15 0 53.3 267.2 1517.165 1517.113

...

<          12 0 -65.5 86.6 -1047.031 -1047.083

<          33 0 -76.0 240.3 632.424 632.371

 

<SATVIS2 USB1 2 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     QZSS TRUE TRUE 4

<          194 0 13.5 310.7 203.666 203.614

<          195 0 -16.0 274.7 -306.102 -306.154

<          199 0 -25.6 293.3 2.197 2.145

<          196 0 -47.1 271.8 449.579 449.527

 

<SATVIS2 USB1 1 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     BEIDOU TRUE TRUE 59

<          43 88 79.1 302.7 545.401 545.349

<          11 0 69.0 83.5 -960.045 -960.097

...

<          13 0 -81.1 244.3 116.464 116.413

<          29 88 -81.6 120.6 -430.185 -430.237

 

<SATVIS2 USB1 0 54.0 FINESTEERING 2209 513610.000 02000020 a867 16809

<     NAVIC TRUE FALSE 0

Field

Field type

Description

Format

Binary Bytes

Binary Offset

1

Log header

SATVIS2 header

For information about log headers, see ASCII, Abbreviated ASCII or Binary.

 

H

0

2

Satellite System

GNSS satellite system identifier. See Table: Satellite System

Enum

4

H

3

sat vis

Is satellite visibility valid?

   0 = FALSE

   1 = TRUE

Enum

4

H+4

4

almanac flag

Was complete almanac used?

   0 = FALSE

   1 = TRUE

Enum

4

H+8

5

#sat

Number of satellites with data to follow

Ulong

4

H+12

6

Satellite ID

In binary logs, the satellite ID field is 4 bytes. The 2 lowest order bytes, interpreted as a USHORT, are the system identifier: for instance, the PRN for GPS or the slot for GLONASS. The 2 highest-order bytes are the frequency channel for GLONASS, interpreted as a SHORT and zero for all other systems. In ASCII and abbreviated ASCII logs, the satellite ID field is the system identifier. If the system is GLONASS and the frequency channel is not zero, then the signed channel is appended to the system identifier. For example, slot 13, frequency channel -2 is output as 13-2.

For more information, refer to PRN Numbers

Ulong

4

H+16

7

health

Satellite health

Satellite health values may be found in the applicable Interface Control Document for each system.

Ulong

4

H+20

8

elev

Elevation (degrees)

Double

8

H+24

9

az

Azimuth (degrees)

Double

8

H+32

10

true Doppler

Theoretical Doppler of satellite - the expected Doppler frequency based on a satellite's motion relative to the receiver. It is computed using the satellite's coordinates and velocity along with the receiver's coordinates and velocity (Hz).

Double

8

H+40

11

apparent Doppler

Apparent Doppler for this receiver - the same as Theoretical Doppler above but with clock drift correction added (Hz).

Double

8

H+48

12

Next satellite offset = H + 16 + (#sat x 40)

13

xxxx

32-bit CRC (ASCII and Binary only)

Ulong

4

H+16+
(#sat x 40)

14

[CR][LF]

Sentence terminator (ASCII only)

-

-

-