Receiver and method for evaluating satellite signal blocking state in environment through receiver

Abstract

The invention provides a method for evaluating the satellite signal blocking state in an environment through a global navigation satellite system (GNSS) receiver. The method includes the following steps that after the receiver captures and tracks satellite signals, carrier-to-noise ratios of all satellites tracked by the receiver at current measurement moment are cached, and predictive information such as the elevation angle of satellites relative to the position of the receiver at the current moment is cached; if the receiver has already stored the predictive information of the satellites and carrier-to-noise ratio information of the satellites, the receiver carries out classified statistic on the satellites, supported currently, of all systems, and evaluates the satellite signal blocking state in the current environment according to the result of classified statistic. By means of the method, the receiver can accurately evaluate the satellite signal blocking state in the environment where the receiver is located before entering the navigation computation link, so that corresponding optimization of a navigation computation algorithm is achieved and a positioning result more close to an actual position is obtained.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for a receiver to evaluate the satellite signal blocking condition in the environment. Background technique [0002] The Global Positioning System (GPS) designed by the United States is the most mature system in the current Global Navigation Satellite System (GNSS). The standard positioning service provided by it has a single-point positioning error of 13 meters and 22 meters in the horizontal and vertical directions, respectively. , while the low-end user receivers currently on the market can obtain a positioning accuracy of less than 10 meters in autonomous mode. With Russia's GLONASS system, China's Beidou second-generation system and Europe's Galileo system gradually put into use, the number of visible satellites in the sky has increased, the satellite constellation has become larger, and the failure rate of satellites has become relatively low. It can ...

AI Technical Summary

Problems solved by technology

In these complex environments, satellite signals are easily blocked by obstacles and cannot reach the receiver, reducing the number of visible satellites and reducing the strength of satellite signals reaching the receiver; at the same time, obstacles will also reflect satellite signals, so that the receiver can The phenomenon of receiving the same satellite signal from multiple propagation paths (that is, multipath phenomenon) occurs frequently, which increases the error of satellite measurement value and user positioning error

It can be seen that the positioning accuracy of the receiver in a complex environment will be significantly lower than that in a wide-view environment

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