diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/SingleLineGNSSCalcService.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/SingleLineGNSSCalcService.java
index 51456e9d..1e5a6736 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/SingleLineGNSSCalcService.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/SingleLineGNSSCalcService.java
@@ -233,7 +233,12 @@ public class SingleLineGNSSCalcService implements GNSSDataCalcService {
                 gnssCalcFilterService.calc(device, groupCalc, locationRecord, latestRpos);
             }
             else {
-                gnssCalcFilterService.calc(device, groupCalc, locationRecord, focusCalculator.getReferPoint());
+                if(focusCalculator.getVer()==1 || focusCalculator.getVer()==3 || focusCalculator.getVer()==5){
+                    gnssCalcFilterService.calc(device, groupCalc, locationRecord, null);
+                }
+                else {
+                    gnssCalcFilterService.calc(device, groupCalc, locationRecord, focusCalculator.getReferPoint());
+                }
             }
 
             // 记录本次位置，作为下次的参考