Changes for page General Manual for -CB , -CS models
Last modified by Mengting Qiu on 2025/03/08 11:35
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... ... @@ -928,6 +928,11 @@ 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 - IndoorGPSsignal is veryweak,outdoorpositioning 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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