<
From version < 117.1 >
edited by Mengting Qiu
on 2024/09/03 09:58
To version < 116.1 >
edited by Mengting Qiu
on 2024/09/03 09:45
>
Change comment: Uploaded new attachment "image-20240903094457-2.png", version {1}

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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 -=== 6.5.1 GPS commands ===
934 -
935 -
936 936  The following are three related AT commands that introduce GPS functions.
937 937  
938 938  * **Turn on/off GPS**
... ... @@ -949,6 +949,7 @@
949 949  
950 950  Example:  Downlink Payload: **11 01   **~/~/ AT+GPS=1
951 951  
947 +
952 952  * **Set GNSS open time**
953 953  
954 954  Extend the time to turn on GNSS. The automatic GPS location time is extended when the node is activated.
... ... @@ -963,6 +963,7 @@
963 963  
964 964  Example:  Downlink Payload: **10 00 1E    **~/~/ AT+GNSST=30
965 965  
962 +
966 966  * **Set GPS positioning interval**
967 967  
968 968  Feature: Set GPS positioning interval (unit: hour).
... ... @@ -982,43 +982,13 @@
982 982   Downlink Payload: **12 00 00 18   **~/~/ AT+GTDC=24
983 983  
984 984  
985 -=== 6.5.2 GPS workflow ===
982 +Indoor GPS signal is very weak, outdoor positioning is generally recommended.
986 986  
987 987  
988 -The whole working process after the GPS function is enabled((% style="color:#037691" %)**AT+GPS=1**(%%)) is as follows:
989 989  
990 -~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.
991 991  
992 - 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.
993 993  
994 - So if there is a failure of positioning, the user can extend the (% style="color:#037691" %)**GNSST**(%%) time appropriately.
995 995  
996 -2. Each TDC time node is not repositioned and the positioning interval is determined by the AT+GTDC time.
997 997  
998 - The latitude and longitude payload uplinked at each TDC time is the GPS positioning information from the previous (% style="color:#037691" %)**GTDC**(%%) time.
999 999  
1000 - 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.
1001 -
1002 -
1003 -=== 6.5.3 GPS debugging methods ===
1004 -
1005 -
1006 -In summary, we can deduce the method of debugging GPS:
1007 -
1008 -* **Check whether the GPS antenna is loose**.
1009 -
1010 -If the GPS antenna is loose, the GPS signal is weak, and the positioning fails.
1011 -
1012 -[[image:image-20240903094214-1.png||height="340" width="461"]]
1013 -
1014 -* **Use the AT+GNSST command to extend the positioning time.**
1015 -
1016 -The default AT+GNSST=30, that is, the default positioning time is 30 seconds.
1017 -
1018 -If the location fails, users can extend the location time.
1019 -
1020 -
1021 -
1022 -
1023 -
1024 1024  
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