Night polarization angle error correction method based on starlight vector information

Abstract

The invention relates to a night polarization angle error correction method based on starlight vector information. The method comprises the following steps: firstly, measuring a polarization angle of a carrier in an observation direction in a current state by using a polarization sensor, representing the polarization angle as the sum of a polarization angle true value and a polarization angle error, and calculating a polarization vector through the polarization angle measured by the polarization sensor; calculating the expression mi of the moon at the current moment under an inertial coordinate system i according to clock information built in a carrier in combination with an astronomical calendar, conducting measuring by utilizing an astronomical sensor to obtain star light vectors under a system b and the system i, and converting mi to the system b by constructing a conversion matrix between the system i and the system b in combination with the conversion matrix to obtain mb as a nominal value of the moon vector under the system b; defining a state vector x by taking the polarization angle error as a state quantity and combining an inertial navigation error equation, and further establishing a state equation; and establishing a relation equation between the moon nominal value mb and the polarization angle error of the observation point, and linearizing the equation, thereby establishing a measurement equation, and estimating the polarization angle error.

Description

Technical field [0001] The present invention belongs to the field of navigation, to a method of error correction based on the vector information starlight night sky polarization angle, the aircraft can be used in the complex environment in the presence of electromagnetic interference at night, resulting in autonomous navigation of the unmanned satellite motion vector signal failure environment, improve the viability of the aircraft. Background technique [0002] Nighttime ambient light is dark, covert and good benefits, nighttime autonomous navigation capabilities related to aircraft flight safety, for the effective completion of the mission of great significance. Currently, the US GPS system, the establishment of China's BDS system, making satellite navigation systems have been widely used, but its over-reliance on communication signals so that the signals easily lead to failure when navigation information is obscured or interference. Therefore, to improve the autonomous navigat...

AI Technical Summary

Problems solved by technology

However, due to the influence of weather and environment on the polarization information, the error is often large, and it is a difficult problem to correct and compensate the polarization error

[0004] The existing integrated navigation methods of polarization and astronomy, such as the authorized patent "An integrated navigation method based on polarization information (ZL201611062735.2)", do not make full use of the characteristics of astronomical information and polarization. The existing errors are corrected, and the authorized patent "A Heading and Attitude Determination Method Based on Polarization / Astronomical Information Fusion (ZL201911252069.2)" does not consider the influence of polarization angle errors, nor does it closely combine astronomical and polarization information and use astronomical information Correction for polarization angle errors

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