diff --git a/src/i2c_communication.cpp b/src/i2c_communication.cpp
index e8baa2a..736723c 100644
--- a/src/i2c_communication.cpp
+++ b/src/i2c_communication.cpp
@@ -58,29 +58,66 @@ void onReceiveEvent(int bytes) {
     }
 }
 
+// // 更新传感器状态和数据
+// unsigned long last_gps_data_time = 0;
+// static uint8_t last_receive_cnt = 0;
+
+// void update_sensor_data() {
+//     //gps
+//     //if (millis() > 5000 && gps.charsProcessed() < 10 && digitalRead(GPS_POWER_PIN) == HIGH) 
+//     if (gps.charsProcessed() < 10) {
+//         sensor_data.gps_sta = 0x00; // 无设备
+//         sensor_data.gps_lat = 0.0f;
+//         sensor_data.gps_lon = 0.0f;
+//     } else if (!gps.location.isUpdated()) {
+//         sensor_data.gps_sta = 0x02; // 未搜到信号
+//         sensor_data.gps_lat = 0.0f;
+//         sensor_data.gps_lon = 0.0f;
+//     } else {
+//         sensor_data.gps_sta = 0x03; // 正常工作
+//         sensor_data.gps_lat = gps.location.lat();
+//         sensor_data.gps_lon = gps.location.lng();
+//     }
+
+//     //测距
+//     //if (receive_cnt == last_receive_cnt && digitalRead(RANGING_POWER_PIN) == HIGH) 
+//     if (receive_cnt == last_receive_cnt){
+//         sensor_data.height_sta = 0x00; // 无设备
+//         sensor_data.height = 0.0f;
+//     }else {
+//         last_receive_cnt = receive_cnt;
+//         sensor_data.height_sta = 0x03; // 有效高度，正常工作
+//         sensor_data.height = (float)distance / 1000.0f; // mm -> m
+//     }
+// }
+
 // 更新传感器状态和数据
 unsigned long last_gps_data_time = 0;
 static uint8_t last_receive_cnt = 0;
-
+uint32_t  count = 0;
 void update_sensor_data() {
-    //gps
-    //if (millis() > 5000 && gps.charsProcessed() < 10 && digitalRead(GPS_POWER_PIN) == HIGH) 
     if (gps.charsProcessed() < 10) {
         sensor_data.gps_sta = 0x00; // 无设备
         sensor_data.gps_lat = 0.0f;
         sensor_data.gps_lon = 0.0f;
-    } else if (!gps.location.isUpdated()) {
-        sensor_data.gps_sta = 0x02; // 未搜到信号
-        sensor_data.gps_lat = 0.0f;
-        sensor_data.gps_lon = 0.0f;
-    } else {
-        sensor_data.gps_sta = 0x03; // 正常工作
-        sensor_data.gps_lat = gps.location.lat();
-        sensor_data.gps_lon = gps.location.lng();
+    } 
+    else 
+    {
+        if (gps.location.isUpdated()) {
+            count = 0;
+            sensor_data.gps_sta = 0x03; // 正常工作
+            sensor_data.gps_lat = gps.location.lat();
+            sensor_data.gps_lon = gps.location.lng();
+        }
+        else 
+        {
+            count ++;
+            if (count > 50) {
+                sensor_data.gps_sta = 0x02; // 未搜到信号
+            }
+        }
     }
-
-    //测距
-    //if (receive_cnt == last_receive_cnt && digitalRead(RANGING_POWER_PIN) == HIGH) 
+    
     if (receive_cnt == last_receive_cnt){
         sensor_data.height_sta = 0x00; // 无设备
         sensor_data.height = 0.0f;