To overcome the lack of accuracy,reliability,availability,and anti-jamming in satellite navigation system and meet the needs of military and civilian users for positioning,navigation,and timing(PNT)at anytime,anywhere and in any environment,there is an urgent need to study the local PNT spatiotemporal baseline network based on land-based pseudolites.However,in the existing local positioning system,the requirement for accurate mapping of base stations coordinates in advance limits the mobility,flexibility and rapid deployment capability of the system.In order to solve this problem,this paper studies the technique of establishing local positioning system spatial coordinate independently in high precision.Based on the shortest path algorithm and the nonlinear conjugate gradient method,the proposed technique can independently estimate the relative position of each pseudolite and the network structure of the local positioning system according to the partial ranging information between the pseudolite base stations,and establish the local positioning system spatial coordinate.The results of performance analysis show that compared with other existing space coordinate establishment techniques,the technique proposed not only has the higher precision in the spatial coordinate establishment but also has lower computational complexity.Moreover,it is practical that it can handle the circumstance in which partial distance information in the network is missing.It can greatly simplify the laying cost and shorten the deployment time of local PNT system,reduce the maintenance difficulty and greatly improve the mobility and flexibility of the system in practice.