Pseudorange calculation method and terminal

Abstract

A pseudorange calculation method, a terminal, a computer program product and a computer storage medium are provided, which include: acquiring the current time local to the terminal (201); acquiring the distance between the terminal and the lost lock satellite (202), the lost lock satellite is a satellite providing positioning service for the terminal before the lock is lost; calculating, accordingto the current time and the distance, a first transmission time (203) of transmitting the satellite signal to the terminal by the lost lock satellite; according to the first transmission Calculatinga second transmission time by time and an actual time of the navigation message transmitted from the loss-locking satellite (204); calculating between the terminal and the lost-lock satellite according to the current time and the second transmission time The pseudorange (205). The method does not need to perform frame synchronization in the pseudorange calculation process, thereby avoiding the completion of the frame synchronization and waiting for a long time, shortening the time consumed by the terminal to calculate the pseudorange, and improving the speed of the pseudorange calculation.

Description

technical field [0001] The present application relates to the technical field of satellite navigation, in particular to a pseudorange calculation method and terminal. Background technique [0002] In order to realize the positioning function, terminals such as drones, vehicles, and mobile phones are generally implemented by setting the Global Navigation Satellite System (GNSS), for example, the Global Positioning System (Global Positioning System, GPS), Beidou Satellite Navigation System (BeiDou Navigation Satellite System, BDS), GLONASS navigation system (Global Navigation Satellite System, GLONASS) and Galileo navigation system GALILEO, etc. When the GNSS navigation satellite signal is weak, for example, when the terminal passes through caves, bridge holes, underground passages, building occlusions, etc. in the process of moving and encounters sudden interference, the terminal cannot Track and lock the satellite signal, thus causing the satellite signal to lose lock. Whe...

AI Technical Summary

Problems solved by technology

[0004] Due to the large range of uncertainty when estimating the launch time of the satellite signal, not only the bit synchronization but also the frame synchronization need to be completed before the code phase, code cycle count, bit count, preset bit corresponding time, and preset The transmission time is estimated by parameters such as the time corresponding to the coding cycle, and then the pseudo-range is further estimated according to the transmission time. However, the completion of frame synchronization needs to wait for a long time, so the waiting time for the terminal to calculate the pseudo-range is relatively long.

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