<
From version < 115.1 >
edited by Mengting Qiu
on 2024/09/03 09:42
To version < 118.1 >
edited by Mengting Qiu
on 2024/09/03 10:07
>
Change comment: Uploaded new attachment "image-20240903100736-3.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 +
931 931  The following are three related AT commands that introduce GPS functions.
932 932  
933 933  * **Turn on/off GPS**
... ... @@ -944,7 +944,6 @@
944 944  
945 945  Example:  Downlink Payload: **11 01   **~/~/ AT+GPS=1
946 946  
947 -
948 948  * **Set GNSS open time**
949 949  
950 950  Extend the time to turn on GNSS. The automatic GPS location time is extended when the node is activated.
... ... @@ -959,7 +959,6 @@
959 959  
960 960  Example:  Downlink Payload: **10 00 1E    **~/~/ AT+GNSST=30
961 961  
962 -
963 963  * **Set GPS positioning interval**
964 964  
965 965  Feature: Set GPS positioning interval (unit: hour).
... ... @@ -979,13 +979,43 @@
979 979   Downlink Payload: **12 00 00 18   **~/~/ AT+GTDC=24
980 980  
981 981  
982 -Indoor GPS signal is very weak, outdoor positioning is generally recommended.
985 +=== 6.5.2 GPS workflow ===
983 983  
984 984  
988 +The whole working process after the GPS function is enabled((% style="color:#037691" %)**AT+GPS=1**(%%)) is as follows:
985 985  
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.
986 986  
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.
987 987  
994 + So if there is a failure of positioning, the user can extend the (% style="color:#037691" %)**GNSST**(%%) time appropriately.
988 988  
996 +2. Each TDC time node is not repositioned and the positioning interval is determined by the AT+GTDC time.
989 989  
998 + The latitude and longitude payload uplinked at each TDC time is the GPS positioning information from the previous (% style="color:#037691" %)**GTDC**(%%) time.
990 990  
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 +
991 991  
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