diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java
index 6f0f9177..a6f0c6a9 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java
@@ -169,7 +169,9 @@ public class GNSSCalcFilterService {
                     newRecord.setAuxn(NumberUtils.scaleTwo(msumN / minCount));
                     newRecord.setAuxd(NumberUtils.scaleTwo(msumD / minCount));
                     //滤波窗口里的时间跨度超过滤波时间的2/3才认为稳定
-                    newRecord.setStabled(lastRecordTime.isBefore(newRecordTime.minusHours(filterCycleHour * 1 / 2)));
+                    int stabledHours=filterCycleHour/2;
+                    if(stabledHours>12) stabledHours=12;
+                    newRecord.setStabled(lastRecordTime.isBefore(newRecordTime.minusHours(stabledHours)));
                     return true;
                 }
             }
@@ -249,7 +251,9 @@ public class GNSSCalcFilterService {
                     newRecord.setAuxn(NumberUtils.scaleTwo(msumN / minCount));
                     newRecord.setAuxd(NumberUtils.scaleTwo(msumD / minCount));
                     //滤波窗口里的时间跨度超过滤波时间的2/3才认为稳定
-                    newRecord.setStabled(lastRecordTime.isBefore(newRecordTime.minusHours(filterCycleHour * 1 / 2)));
+                    int stabledHours=filterCycleHour/2;
+                    if(stabledHours>12) stabledHours=12;
+                    newRecord.setStabled(lastRecordTime.isBefore(newRecordTime.minusHours(stabledHours)));
                     return true;
                 }
             }