Dynamic correction algorithm of GNSS receiver

A dynamic correction and receiver technology, applied in the field of navigation and positioning, can solve problems such as poor results

Inactive Publication Date: 2014-05-21
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

[0004] For the dynamic correction algorithm, there have been many research results, such as the cross-correlation method, the spectral peak tracking method, and the method of using the Keystone transform to correct the distance curvature proposed by Yang J G and Huang X T in 2011, but these methods can only be used for In the case of high signal-to-noise ratio, the effect is not good in the case of low signal-to-noise ratio

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  • Dynamic correction algorithm of GNSS receiver
  • Dynamic correction algorithm of GNSS receiver
  • Dynamic correction algorithm of GNSS receiver

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Embodiment Construction

[0043] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] The structure of the GNSS receiver used in this embodiment is as follows: figure 1 As shown, the GNSS receiver is composed of a radio frequency front-end, a baseband signal processing module, and a navigation positioning calculation module. The baseband signal processing module consists of sub-modules such as signal acquisition, tracking, decoding and navigation message extraction.

[0045] GNSS signal acquisition roughly estimates pseudo-code phase and carrier Doppler frequency, and the signal tracking module realizes accurate estimation of pseudo-code phase and carrier Doppler frequency, so as to realize despreading and demodulation of GNSS signals. The decoding and message extraction module obtains the navigation message through Viterbi decodin...

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Abstract

The invention discloses a dynamic correction algorithm of a GNSS receiver. The dynamic correction algorithm uses differential coherence technology and does not need to estimate navigation message flip so that the computation cost is lowered greatly. The dynamic correction algorithm includes that carrying out dynamic correction before performing coherent addition, to be more specific, designing a DBZP differential coherence acquisition algorithm output matrix, extracting items related to range walk and range curvature through DFT transformation, designing a Keystone transformation algorithm to remove items related to range walk, and constructing phase compensation functions according to related information of related functions in a frequency domain to compensate the range curvature. The dynamic correction algorithm further weakens the influences of Doppler frequency and the change rate thereof, and accordingly the energy of the signal is more concentrated after performing the coherence addition; and moreover, the dynamic correction does not use an intermediate estimate, so that the dynamic correction algorithm is applicable to the environment with low signal to noise ratio, and the receiver can work normally under the application environment with low signal to noise ratio and high dynamic nature.

Description

technical field [0001] The invention belongs to the technical field of navigation and positioning, and in particular relates to a dynamic correction algorithm of a GNSS receiver. Background technique [0002] Satellite Navigation and Positioning System (GNSS) is a satellite-based radio navigation system that can provide all-weather, uninterrupted, high-precision, real-time navigation and positioning services for various carriers on land, sea and air. Various fields of daily life, such as ground traffic supervision, aircraft and ship navigation, precision timekeeping, geodetic surveying, etc. At present, the GPS system, the earliest developed and applied satellite positioning system in the world, has been widely used in my country. my country has also participated in the construction of the Galileo (Galileo) system that will be completed in the past two years, and is independently developing the global satellite positioning system. Compass (the second generation of Beidou), t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23
CPCG01S19/246G01S19/37
Inventor 高法钦
Owner ZHEJIANG SCI-TECH UNIV
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