The BeiDou Navigation Satellite System (BDS) has developed rapidly. and the combination of BDS Phase II (BDS-2) and BDS Phase III (BDS-3) has attracted wide attention. It is found that there are code ISBs between BDS-2 and BDS-3. which may have a certain impact on the BDS-2 and BDS-3 combined positioning. https://smokeysmountainfurnitureoutlets.shop/product-category/credenza-and-hutch/