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A kind of gnss signal capture method

A signal acquisition, baseband signal technology, used in satellite radio beacon positioning systems, measurement devices, instruments, etc.

Active Publication Date: 2017-10-31
TECHTOTOP MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In principle, the longer the coherent accumulation time, the higher the capture sensitivity, but the coherent accumulation time is affected by bit flips, the incoherent time is affected by code Doppler, and is also restricted by the computing power and area of ​​the chip.

Method used

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  • A kind of gnss signal capture method
  • A kind of gnss signal capture method
  • A kind of gnss signal capture method

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] figure 1 It is an overall block diagram of the capture algorithm / scheme of the present invention. First, carrier stripping is performed on the intermediate frequency data to obtain I and Q two-way signals, and then M-point summation processing is performed to reduce the sampling rate of data and reduce the hardware resources required for storing data. Then, in order to further reduce hardware resources, the data is truncated and limited. At this point, the obtained data is stored in IFBuffer. Then, under the operation of the Buffer control module, the data in the IF Buffer is read. Next,...

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Abstract

The invention provides a GNSS signal capturing method. The GNSS signal capturing method comprises the steps that a baseband signal stripping step is that baseband signals are stripped from GNSS signals; a data caching step is that the baseband signals are downsampled, and then stored in chip and storage space in sequence; a data reading step is that chips and data are read from the chip and storage space to be used for integral accumulation, and further comprises that when Doppler frequency offset is positive, code phases are determined by the Doppler frequency offset, corresponding chips and data are read according to the corresponding code phases to be used for the integral accumulation, and when the Doppler frequency offset is negative, a starting reading position of the chips and storage space is determined according to Doppler frequency, and corresponding chips and data are read from the starting reading position to be used for the integral accumulation. GNSS signals comprise GPS, GLONASS, Galileo and Compass (China beidou navigation satellite system) and the like.

Description

technical field [0001] The invention relates to a signal acquisition method of a GNSS global satellite navigation system receiver. Background technique [0002] GNSS (Global Navigation Satellite System) is a general term for all navigation satellite systems worldwide, including GPS (Global Positioning System, US Global Positioning System), GLONASS (Russian Glonass Navigation Satellite System), Galileo (European Galileo navigation satellite system), Compass (China Beidou navigation satellite system), etc., all of the above navigation satellite systems are designed to provide users with satellite navigation and positioning services around the clock. However, when users use complex environments, such as urban canyons, tunnels, viaducts, etc., the GNSS satellite signals received from the GNSS satellite navigation system have the characteristics of weak signals, high dynamics, and strong interference. At this time, high-sensitivity GNSS acquisition technology is required. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 王晓菊毛锐邓填棣谭小刚
Owner TECHTOTOP MICROELECTRONICS