diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/task/AbnormalDeviceProcessor.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/task/AbnormalDeviceProcessor.java
index 9d55f0f9..bf065db4 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/task/AbnormalDeviceProcessor.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/task/AbnormalDeviceProcessor.java
@@ -55,6 +55,7 @@ public class AbnormalDeviceProcessor{
     private void checkDevice() {
         logger.info("zny checkDevice");
         checkNoDataDevice("2345080","2345068","2410190");
+        checkNotGoodDevice("2412254","2412272");
         //checkNoDataDevice("2345084","2415276","2345076");
         //checkNoDataDevice("2345085","2345068","2345075");
     }
@@ -142,4 +143,28 @@ public class AbnormalDeviceProcessor{
         }
     }
 
+    List<GnssCalcData> getLastTwo(String deviceId){
+        LocalDateTime now = LocalDateTime.now();
+        QueryWrapper<GnssCalcData> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("deviceid",deviceId);
+        queryWrapper.eq("enabled",true);
+        queryWrapper.isNotNull("rpose");
+        queryWrapper.ge("createtime",now.minusHours(24));
+        queryWrapper.orderByDesc("createtime");
+        queryWrapper.last("limit 2");
+
+        return gnssDataMapper.selectList(queryWrapper);
+    }
+
+    void checkNotGoodDevice(String deviceId, String refDeviceId1){
+        List<GnssCalcData> calcDataList = getLastTwo(deviceId);
+        List<GnssCalcData> calcDataList1 = getLastTwo(refDeviceId1);
+        if(calcDataList.size() == 2 && calcDataList1.size()==2){
+            double deltaU = calcDataList1.get(0).getRposd() - calcDataList1.get(1).getRposd();
+            GnssCalcData calcData = calcDataList.get(0);
+            calcData.setRposd(calcDataList.get(1).getRposd()+deltaU);
+            gnssDataMapper.updateById(calcData);
+        }
+   }
+
 }