Method for quickly acquiring GPS signal and system thereof

Abstract

The invention provides a method for quickly acquiring GPS signals and a GPS signal quick acquiring system which comprises the method. The main hardware parts of the system mainly comprise a quick acquisition module; the quick acquisition module acquires the GPS signals in parallel in large scale, obtains the initial phase and frequency information of the GPS signals and sends the signals to a correlator; and the correlator completes the carrier removal correlation of corresponding phase and frequency, and then accumulates the data and saves the data in a register. A microprocessor schedules the assembly lines of the quick acquisition module and the multi-channel correlator, simultaneously distributes the satellite number of the next quick acquisition module, confirms the data given by the channels of the correlator by quick detection algorithm processing so as to quickly and accurately acquire the GPS signals.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning and reception, and relates to a method for capturing GPS received signals, in particular to a method for quickly capturing GPS signals and a system thereof. Background technique [0002] Nowadays, the miniaturization, high precision and low power consumption of GPS (Global Positioning System) receiver chips or chipsets have effectively promoted the practical application of GPS positioning, making it gradually applied to high-end electronic devices such as mobile phones and electronic navigation. However, these high-end electronic application devices have put forward very high requirements for the development of satellite positioning receiving technology, not only requiring GPS positioning signals to be quickly captured and working in real time, but also requiring low energy consumption and low cost. Therefore, for GPS receivers, the fast acquisition of GPS signals is a very important...

AI Technical Summary

Problems solved by technology

Implementing FFT with software requires processing a large amount of data. In low-cost GPS applications, due to the limitation of the software platform, it is not suitable for FFT processing of large data volumes.

[0004] In the prior art, there are also many methods for accelerating GPS signal capture, such as the fast capture method that uses some auxiliary information to predict, an application number is CN01117214.2, and the name is "GPS signal fast capture in GPS system" invention Patent, the disadvantage of which is that other auxiliary equipment is required to provide auxiliary information

Another example is the invention patent whose application number is CN200710001588 and which is named "Global Positioning System Signal Acquisition Method". The exhaustive method is used to find the boundary flip signal, and its disadvantage is that the calculation is too complicated

[0005] In summary, several existing technologies have limitations such as complex counting and the need for auxiliary information

Images