The fast motion of low Earth orbit (LEO) satellites provides rapid geometric changes in a short time. which can accelerate the initialization of precise point positioning (PPP). The rapid convergence of ambiguity parameters is conducive to the rapid success of ambiguity fixing. This paper presents the performance of single- and four-system combined PPP Ambiguity Resolution (AR). https://countryscenesaddleryandpetsuppliers.shop/product-category/contact-reins/