Navigation data processing method and system

A technology for navigation data and processing methods, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve the problems of parameter deviation from actual values, filter degradation, insufficient accuracy, etc. Influence of incomplete information, effect of ensuring tracking accuracy

Inactive Publication Date: 2017-05-10
北京瑞德基业光电技术有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the Kalman filter requires a complete description of the system dynamic model and statistical model parameters in the current technology, and there will be unknown constant deviation or random deviation in the model to make the parameters deviate from the actual value, which may lead to The filter degrades or diverges, and the accuracy is not enough

Method used

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  • Navigation data processing method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0140] GPS Pseudocode Tracking Loop in High Dynamic Environment

[0141] The purpose of the code tracking loop is to improve the correlation between the spread spectrum code received by the receiver and the local recurrence code, so as to complete the despreading of the spread spectrum code to obtain accurate navigation and positioning data information. Signal acquisition is to limit the code phase difference between the received satellite signal spreading code and the local reappearance code within the range of ±0.5 chips, and the tracking loop can reduce the code phase difference to the allowable error within range. In addition, in high dynamic scenarios, the Doppler between the receiver and the satellite will affect the code rate of the satellite signal, which causes the code phase and code rate of the satellite signal to be constantly changing, so the code tracking loop needs to monitor the local code The code phase and code rate are constantly adjusted so that the system...

Embodiment 2

[0148] Carrier tracking loop simulation experiment based on adaptive second-order Kalman filter

[0149] The difference between the carrier tracking loop based on the adaptive second-order Kalman filter and the traditional third-order PLL is that the former has an additional adaptive filter before the loop filter. This design can not only increase the stability of the loop but also reduce the The bandwidth of the road improves the estimation accuracy. Therefore, the loop bandwidth of the third-order PLL assisted by the adaptive second-order Kalman filter can be set to 7Hz, because the adaptive second-order Kalman filter can estimate the phase error more accurately in the noise environment, thus The carrier-to-noise ratio of the signal is greatly improved, thereby improving the dynamic adaptability of the PLL. In addition, in order to verify the filtering performance of the adaptive second-order Kalman filter when the prior information is inaccurate, it is assumed that the noi...

Embodiment 3

[0152] Simulation of Pseudocode Tracking Loop

[0153] In a high dynamic environment, a large Doppler frequency offset will not only bring errors to the carrier phase delay, but also change the code rate of the C / A code. The Doppler effect is inversely proportional to the wavelength of the signal, and the code rate of C / A is 1.023MHz, which is 1 / 1540 times the carrier frequency. Therefore, the additional Doppler on the base speed of the code is greater than that on the carrier frequency The Doppler is much smaller. Since the tracking accuracy of the carrier loop is much greater than that of the code loop, most of the dynamics can be eliminated by using the carrier loop to assist the code loop, and the loop bandwidth of the code tracking loop can be made very narrow after the carrier is used, so that it can effectively Noise is suppressed, and the loop can also use a low-order loop. This patent uses a second-order loop to prevent the ramp-up of the code phase deviation that ma...

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Abstract

The invention relates to a navigation data processing method and system. The method comprises the following steps: S1, an input intermediate frequency signal and a carrier signal are subjected to carrier stripping by a mixer; S2, a lead correlation value, an instant correlation value and a lag correlation value are output after a navigation signal and a local pseudo code pass through a correlator; S3, lead and lag navigation data signals enter a code loop phase discriminator, are filtered by a code loop filter and then enter a local pseudo-code generator to make thus generated pseudo code same as that of the intermediate frequency signal in term of phase; S4, an instant road navigation data signal enters a carrier loop phase discriminator, enters a carrier digital control oscillator via the filter, wherein the phase of the carrier generated by the instant road navigation data signal is the same as that of the carrier generated by the intermediate frequency signal. The system comprises a signal input module, a correlator processing module, a code loop processing module and a carrier processing module. The method tracks the motion state of the carrier, improves the tracking accuracy, and obtains an accurate observation value.

Description

technical field [0001] The invention relates to the field of navigation data processing, in particular to a navigation data processing method and system thereof. Background technique [0002] The tracking technology of GNSS receiver signals in high dynamic environment is the difficulty and focus of research, because the Doppler frequency shift in high dynamic environment is relatively large, resulting in the common carrier phase locked loop and pseudo code delay locked loop without any It is difficult to work reliably and stably in the case of assistance, so it is difficult to extract various required observations, and it is impossible to implement navigation and positioning for the carrier. Therefore, how to track stably and reliably has become a hot spot in the research of high dynamic GNSS receivers. [0003] Since the relevant technologies of high dynamic GNSS receivers involve sensitive fields such as military industry, foreign high-performance products and high-tech ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 刘科学白景坡
Owner 北京瑞德基业光电技术有限公司
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