Method for preprocessing observed quantity of global positioning system receiver

Abstract

The invention discloses a method for preprocessing observed quantity of a global positioning system (GPS) receiver, comprising the following steps: the receiver latches and stores the observed quantity when the measuring sub-time slot signal comes; the receiver filters the latched and the stored observed quantity when the resolving time slot signal comes; and the receiver obtains the final observed value for resolving the receiver position. On the basis of slightly increasing the whole calculated quantity, the invention can effectively improve the positioning accuracy, simultaneously cope with such complex environment as urban forests and greatly reduce the probability of occurrence of positioning error points.

Description

technical field [0001] The present invention relates to the technical field of global satellite positioning and navigation, such as GPS systems, and in particular to a method for preprocessing observations of GPS receivers. Background technique [0002] A global satellite positioning and navigation system, such as the Global Positioning System (GPS), includes a constellation of satellites (also known as Navstar satellites) that transmit GPS signals that can be used by a receiver to determine the receiver's location. The satellite orbits are arranged in multiple planes so that such signals can be received from at least four satellites anywhere on Earth. More typically, such signals are received from more than six satellites in most places on Earth. [0003] The GPS signal transmitted by each GPS satellite is a direct sequence spread spectrum signal. Commercially used signal is related to Standard Positioning Service (SPS) and is called Coarse Code (C / A Code) Direct Sequence...

AI Technical Summary

Problems solved by technology

Driving vehicles often encounter obstacles such as bridges, buildings, tunnels, etc., so that the receiver cannot receive GPS signals with sufficient signal-to-noise ratio

When the signal-to-noise ratio is lower than a certain limit, it will cause extreme deterioration of the observation accuracy, resulting in a greatly reduced positioning accuracy, and even some unacceptable positioning error points for navigation applications.

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