SBAS SV enable/disable record
The SBAS SV enable/disable record is used to enable or disable a selection of the SBAS satellites. By default, the receiver is configured to use all currently available satellites that are in good health. This record is useful for enabling satellites that are not in good health. Once enabled, the health condition of the satellite(s) are ignored, and the SBAS signal transmissions from the satellite(s) are considered when computing position solutions.
The following table shows the additional records provided when the SBAS SV enable/disable record is included with Command Packet 64h.
|
Byte |
Item |
Type |
Value |
Notes |
|---|---|---|---|---|
|
0 |
RECORD TYPE |
1 (Char) |
16h |
SBAS SV Enable/Disable record. |
|
1 |
RECORD LENGTH |
1 (Char) |
2Ch |
Number of bytes in record, excluding bytes 0 and 1. |
|
2 |
SBAS MODE |
1 (Char) |
See SBAS mode values. |
Enable/disable the use of SBAS for positioning. |
|
3 |
OBSOLETE |
1 (Char) |
00h |
Reserved |
|
4 |
OBSOLETE |
1 (Char) |
00h |
Reserved |
|
5 |
OBSOLETE |
1 (Char) |
00h |
Reserved |
|
6 |
OBSOLETE |
1 (Char) |
00h |
Reserved |
|
7–45 |
SBAS SV ENABLE/DISABLE STATES |
39 (Chars) |
See SBAS SV mask values. |
Array of Enable/Disable flags for the 39 SVs. The first byte sets the required Enable/Disable status of SV120, the second sets the status of SV121, etc. See SBAS SVs available. |
The following table provides byte values for the information in the SBAS SV enable/disable record.
SBAS mode values
|
Byte value |
Notes |
|
|---|---|---|
|
Dec |
Hex |
|
|
0 |
00h |
Off |
|
1 |
01h |
Reserved |
|
2 |
02h |
Reserved |
|
3 |
03h |
Track SBAS L1 |
|
4 |
04h |
Reserved |
|
5 |
05h |
Track SBAS L1 + L5 |
SBAS SV mask values
|
Bits |
Value |
Notes |
|
|---|---|---|---|
|
Dec |
Hex |
||
|
Bits 6–0 |
0 |
00h |
Disabled (Off) |
|
|
1 |
01h |
Enabled and heed health (Enable) |
|
|
2 |
02h |
Use even if unhealthy (Ignore Health) |
|
|
3 |
03h |
Enable this SV if it can be used in the current location (Auto Enable) |
|
Bit 7 |
|
Set |
If this bit is set, the satellite’s pseudorange and carrier phase data will be used in the position solution (if they pass the RAIM tests) |
SBAS SVs available
NOTE – This table gives the PRNs of the SBAS SVs available as of February 2014.
|
Byte |
PRN |
Satellite |
|---|---|---|
|
7 |
120 |
|
|
8 |
121 |
|
|
9 |
122 |
SouthPAN – INMARSAT 4-F1 |
|
10 |
123 |
EGNOS – ASTRA-5B |
|
11 |
124 |
|
|
12 |
125 |
SDCM – LUCH-5B |
|
13 |
126 |
EGNOS – EMEA |
|
14 |
127 |
GAGAN – GSAT 8 |
|
15 |
128 |
GAGAN – GSAT 10 |
|
16 |
129 |
|
|
17 |
130 |
|
|
18 |
131 |
WAAS – EUTELSAT 117W B |
|
19 |
132 |
|
|
20 |
133 |
WAAS – SES-15 |
|
21 |
134 |
KASS |
|
22 |
135 |
WAAS – GALAXY 30 |
|
23 |
136 |
EGNOS – SES-5 |
|
24 |
137 |
MSAS – QZS-3 |
|
25 |
138 |
|
|
26 |
139 |
GAGAN – GSAT 15 |
|
27 |
140 |
SDCM – LUCH-5A |
|
28 |
141 |
SDCM – LUCH-5V |
|
29 |
142 |
|
|
30 |
143 |
|
|
31 |
144 |
|
|
32 |
145 |
|
|
33 |
146 |
|
|
34 |
147 |
|
|
35 |
148 |
|
|
36 |
149 |
|
|
37 |
150 |
|
|
38 |
151 |
|
|
39 |
152 |
|
|
40 |
153 |
|
|
41 |
154 |
|
|
42 |
155 |
|
|
43 |
156 |
|
|
44 |
157 |
|
|
45 |
158 |
UK – INMARSAT 3F5 |