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928	928	== 6.5 GPS debugging ==
929	929
930	930
931		-Indoor GPS signal is very weak, **outdoor** positioning is generally recommended.
932		-
933		-[[image:image-20240903104250-9.png||height="275" width="614"]]
934		-
935		-
936		-[[image:image-20240903104431-10.png||height="291" width="621"]]
937		-
938		-
939		-=== 6.5.1 GPS commands ===
940		-
941		-
942	942	The following are three related AT commands that introduce GPS functions.
943	943
944	944	* **Turn on/off GPS**
...	...	@@ -955,6 +955,7 @@
955	955
956	956	Example:  Downlink Payload: **11 01   **~/~/ AT+GPS=1
957	957
	947	+
958	958	* **Set GNSS open time**
959	959
960	960	Extend the time to turn on GNSS. The automatic GPS location time is extended when the node is activated.
...	...	@@ -969,6 +969,7 @@
969	969
970	970	Example:  Downlink Payload: **10 00 1E    **~/~/ AT+GNSST=30
971	971
	962	+
972	972	* **Set GPS positioning interval**
973	973
974	974	Feature: Set GPS positioning interval (unit: hour).
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988	988	Downlink Payload: **12 00 00 18   **~/~/ AT+GTDC=24
989	989
990	990
991		-=== 6.5.2 GPS workflow ===
	982	+Indoor GPS signal is very weak, outdoor positioning is generally recommended.
992	992
993	993
994		-The whole working process after the GPS function is enabled((% style="color:#037691" %)**AT+GPS=1**(%%)) is as follows:
995	995
996		-~1. When activate the node, the node will turn on the GNSS, if the GPS signal is good, the node will print and upload the position information with the first data packet immediately.
997	997
998		- If the signal is not good, it may take the whole (% style="color:#037691" %)**GNSST**(%%) time but still can not search the latitude and longitude information, at this time the node uploads the latitude and longitude all to 0.
999	999
1000		- So if there is a failure of positioning, the user can extend the (% style="color:#037691" %)**GNSST**(%%) time appropriately.
1001	1001
1002		-2. Each TDC time node is not repositioned and the positioning interval is determined by the AT+GTDC time.
1003	1003
1004		- The latitude and longitude payload uplinked at each TDC time is the GPS positioning information from the previous (% style="color:#037691" %)**GTDC**(%%) time.
1005	1005
1006		- Only when the node is activated or every (% style="color:#037691" %)**GTDC**(%%) time is reached, the node turns on the GNSS and we can observe the GPS search information through the serial assistant or Bluetooth tool.
1007		-
1008		-
1009		-=== 6.5.3 GPS debugging methods ===
1010		-
1011		-
1012		-In summary, we can deduce the method of debugging GPS:
1013		-
1014		-* **Check whether the GPS function is enabled.**
1015		-
1016		-[[image:image-20240903102327-5.png||height="271" width="529"]]
1017		-
1018		-* **Check whether the GPS antenna is loose**.
1019		-
1020		-If the GPS antenna is loose, the GPS signal is weak, and the positioning fails.
1021		-
1022		-[[image:image-20240903094214-1.png||height="340" width="461"]]
1023		-
1024		-* **Use the AT+GNSST command to extend the positioning time.**
1025		-
1026		-The default AT+GNSST=30, that is, the default positioning time is 30 seconds.
1027		-
1028		-If the location fails, users can extend the location time.
1029		-
1030		-[[image:image-20240903102641-8.png||height="303" width="600"]]
1031		-
1032		-
1033		-
1034		-
1035	1035

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