Changes for page General Manual for -CB , -CS models
Last modified by Mengting Qiu on 2025/03/08 11:35
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... ... @@ -928,14 +928,6 @@ 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-20240903100832-4.png||height="268" width="580"]] 934 - 935 - 936 -=== 6.5.1 GPS commands === 937 - 938 - 939 939 The following are three related AT commands that introduce GPS functions. 940 940 941 941 * **Turn on/off GPS** ... ... @@ -952,6 +952,7 @@ 952 952 953 953 Example: Downlink Payload: **11 01 **~/~/ AT+GPS=1 954 954 947 + 955 955 * **Set GNSS open time** 956 956 957 957 Extend the time to turn on GNSS. The automatic GPS location time is extended when the node is activated. ... ... @@ -966,6 +966,7 @@ 966 966 967 967 Example: Downlink Payload: **10 00 1E **~/~/ AT+GNSST=30 968 968 962 + 969 969 * **Set GPS positioning interval** 970 970 971 971 Feature: Set GPS positioning interval (unit: hour). ... ... @@ -985,43 +985,13 @@ 985 985 Downlink Payload: **12 00 00 18 **~/~/ AT+GTDC=24 986 986 987 987 988 - ===6.5.2GPS workflow===982 +Indoor GPS signal is very weak, outdoor positioning is generally recommended. 989 989 990 990 991 -The whole working process after the GPS function is enabled((% style="color:#037691" %)**AT+GPS=1**(%%)) is as follows: 992 992 993 -~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. 994 994 995 - 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. 996 996 997 - So if there is a failure of positioning, the user can extend the (% style="color:#037691" %)**GNSST**(%%) time appropriately. 998 998 999 -2. Each TDC time node is not repositioned and the positioning interval is determined by the AT+GTDC time. 1000 1000 1001 - The latitude and longitude payload uplinked at each TDC time is the GPS positioning information from the previous (% style="color:#037691" %)**GTDC**(%%) time. 1002 1002 1003 - 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. 1004 - 1005 - 1006 -=== 6.5.3 GPS debugging methods === 1007 - 1008 - 1009 -In summary, we can deduce the method of debugging GPS: 1010 - 1011 -* **Check whether the GPS antenna is loose**. 1012 - 1013 -If the GPS antenna is loose, the GPS signal is weak, and the positioning fails. 1014 - 1015 -[[image:image-20240903094214-1.png||height="340" width="461"]] 1016 - 1017 -* **Use the AT+GNSST command to extend the positioning time.** 1018 - 1019 -The default AT+GNSST=30, that is, the default positioning time is 30 seconds. 1020 - 1021 -If the location fails, users can extend the location time. 1022 - 1023 - 1024 - 1025 - 1026 - 1027 1027
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