Gnssautonomous; Gnssassisted; Table 11-3: Gnssautonomous Command; Table 11-4: Gnssassisted Command - Semtech LR1110 User Manual

11.3.3 GnssAutonomous

The command GnssAutonomous( ) allows capturing the GNSS signals in autonomous mode, for example in case no
assistance information is available, or for fast indoor/outdoor detection.

Table 11-3: GnssAutonomous Command

Byte 0
Data from
0x04
Host
Data to
Stat1
Host
•
Time: GPS time (GPST), in number of seconds elapsed since 6 January 1980. Hint: When converting from UTC to GPST,
the UTC-GPST corresponding leap second offset must be taken into account.
•
EffortMode =0x00. Other values are RFU
•
ResultMask: bit mask indicating which information is added in the output payload.
bit 0: timestamp presence in output

bit 1: doppler presence in output

bit 2: bit change presence in output

•
NbSvMax defines the maximum number of satellites wanted as a result of the GnssAutonomous( ). If more satellites are
detected during the scanning than NbSvMax,, then the satellites with the highest C/N0 are returned. If NbSvMax=0,
then all the detected satellites are returned.
Please note that calling this command resets the previous GNSS results, if any.

11.3.4 GnssAssisted

The command GnssAssisted( ) allows capturing the GNSS signals using assistance data (current time, approximate position,
and Almanac information)..

Table 11-4: GnssAssisted Command

Byte 0
Data
from 0x04
Host
Data to
Stat1
Host
•
Time: GPS time (GPST), in number of seconds elapsed since 6 January 1980. Hint: When converting from UTC to GPST,
the UTC-GPST corresponding leap second offset must be taken into account.
•
EffortMode
0x00: Low Power mod. The GNSS scanning stops the detection if no strong satellite is detected.

0x01: Best Effort mode. The GNSS scanning continues the detection even if no strong satellite is detected.

LR1110
User Manual Rev.1.0
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1 2
Time
0x09
(31:24) (23:16)
IrqStatus IrqStatus
Stat2
(31:24) (23:16)
1 2 3
Time Time
0x0A
(31:24) (23:16)
IrqStatus IrqStatus
Stat2
(31:24) (23:16)
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3 4
Time
Time Time
(15:8)
(7:0)
IrqStatus IrqStatus
(15:8) (7:0)
4 5
Time Time
(15:8) (7:0)
IrqStatus IrqStatus
(15:8) (7:0)
5 6 7
Effort Result
Mode Mask
0x00 0x00
6 7
Effort
ResultMask
Mode
0x00 0x00
8
NbSvMax
0x00
8
NbSvMax
0x00
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