Ranging code correlation integral improvement method for satellite navigation

A correlation integration and satellite navigation technology, applied in the field of satellite navigation, can solve problems such as affecting the accuracy of pseudorange measurement and difficult to maintain symmetry of pseudocode correlation functions.

Active Publication Date: 2018-10-16
中国人民解放军火箭军工程大学
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Problems solved by technology

[0027] Under high dynamic conditions, changes in the ranging code rate and its higher-order derivatives also make it difficult to maintain the symmetry of the pseudo-code correlation function, which will affect the measurement accuracy of the pseudo-range
At present,

Method used

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  • Ranging code correlation integral improvement method for satellite navigation
  • Ranging code correlation integral improvement method for satellite navigation
  • Ranging code correlation integral improvement method for satellite navigation

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings.

[0063] In order to analyze the correlation integral model of the ranging code more specifically, the phase of the ranging code is expanded by Taylor, the carrier phase is not expanded, and the received signal can be expressed as

[0064]

[0065] For recurring signals, it can be expressed as:

[0066]

[0067] In the formula, n 0 , R CO , Respectively for a relevant integration period T I The initial value of the ranging code phase of the received signal and its first, second and third order derivatives, ε nr (kT S ) is the remainder error of the ranging code phase Taylor expansion of the received signal, T S is the system sampling frequency, c( ) is the ranging code data, exp( ) is the complex form of the carrier, φ 0 (kT S ) means relative to the integration period T I The carrier phase of the kth sampling point within; n, R C , and are the initi...

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Abstract

The invention discloses a ranging code correlation integral improvement method for satellite navigation, the method comprises the following steps: 1) high-order signal representation, ranging code phases are subjected to Taylor expansion and carrier phases are not expanded; 2) received signals are correlated with reproduced signals, and the carrier phase of the local reproduced signal is adjustedthrough the deviation of carrier phases obtained from the carrier correlation integral loop, so that the phases of the received signal and reproduced signal carrier components are completely aligned;3) the correlation integral of the ranging code is solved. Under the high dynamic condition, the result of the high-order correlation integral of the ranging code has obvious nonlinear relationship with the deviation of velocity, acceleration and accelerated acceleration, and thus the traditional method has the problem of poor correlation integral precision. Seen from Figure 4 to Figure 7, The improved model of the invention has very little error in the related integral result caused by the deviation value in the dynamic range of simulation., indicating that the correlation integral calculatedby the difference interval length and method is relatively high in accuracy.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to an improved method for correlation integration of ranging codes for satellite navigation. Background technique [0002] In the traditional model of satellite navigation signal correlation integration, the carrier only considers the phase and its first-order quantity. In general, the relevant integration period T I Within , it is considered that Δω changes very little, and this approximation is feasible. However, under high dynamic conditions or when testing the synthesis accuracy of satellite navigation simulation signals, this approximation will bring large errors, which cannot meet the requirements. Literature [1] studied the correlation integral function of the ranging code under high dynamic conditions, and verified that the measurement accuracy of the pseudo-range will be affected when the frequency offset of the ranging code is regarded as constan...

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Application Information

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IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 范志良姚志成李琳琳闫四海李海龙何凡侯博伍明张盛魁李晓军
Owner 中国人民解放军火箭军工程大学
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