Ranging code correlation integral improvement method for satellite navigation

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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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, there are few studies on the correlation integration of high dynamic ranging codes, and they are generally limited to the first-order dynamic condition, that is, the deviation of the ranging code rate is regarded as a constant within the correlation integration period

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