公开(公告)号：US11709281B2

公开(公告)日：2023-07-25

申请号：US17051428

申请日：2020-01-16

Applicant: SOUTHEAST UNIVERSITY

Inventor： Chengfa Gao ,  Bo Chen ,  Yongsheng Liu ,  Puyu Sun

IPC: G01S19/51 ,  G01S19/07 ,  G01S19/24

CPC classification number: G01S19/51 ,  G01S19/072 ,  G01S19/243

Abstract: The present invention discloses a high-precision point positioning method and device based on a smartphone. The method of the present invention, which belongs to the technical field of satellite positioning, improves the conventional PPP uncombined positioning model, and only uses original GNSS observation values received by a smartphone to carry out high-precision positioning without GNSS reference stations. The positioning method of the present invention comprises following steps: acquiring original observation values of the smartphone, such as GNSS pseudoranges and carrier phases; after preprocessing the data to decrease part of error influences, generating an uncombined model from the original observation values according to an improved precise point positioning method based on an estimation of double clock biases; determining each satellite observation value weight according to a satellite elevation angle; and carrying out filtering positioning by an improved Kalman filtering method to give a high-precision point positioning result.

公开(公告)号：US11294073B2

公开(公告)日：2022-04-05

申请号：US16626570

申请日：2018-05-04

Applicant: SOUTHEAST UNIVERSITY

Inventor： Shuguo Pan ,  Wang Gao ,  Yanheng Wang ,  Chengfa Gao ,  Qing Wang ,  Ruicheng Zhang ,  Jian Zhang ,  Guoliang Liu

IPC: G01S19/44 ,  G01S19/07 ,  G01S19/04 ,  G01S19/25 ,  G01S19/32 ,  G01S19/41

Abstract: A tightly combined GPS/BDS carrier differential positioning method is provided. The method comprises: using a GPS as a reference system to construct a GPS intra-system double-difference ionosphere-free combination model and a GPS/BDS inter-system double-difference ionosphere-free combination model; selecting a BDS reference satellite to re-parameterize an ambiguity of a GPS/BDS inter-system double-difference ionosphere-free combination and perform parameter decorrelation, estimating an ionosphere-free combination carrier differential inter-system bias in real time, and performing reference conversion on the ionosphere-free carrier inter-system bias to realize a continuous estimability of the ionosphere-free carrier differential inter-system bias in necessary; and finally, using ambiguity-fixed base carrier observations to form the ionosphere-free combination and performing tightly combined positioning on the inter-system double-difference ionosphere-free combination based on the estimated ionosphere-free carrier difference inter-system bias.