A Correction Method of Polarization Angle Error at Night Based on Starlight Vector Information

Abstract

The invention relates to a nighttime polarization angle error correction method based on starlight vector information. First, use the polarization sensor to measure the polarization angle in the observation direction of the carrier in the current state, which will be expressed as the sum of the true value of the polarization angle and the error of the polarization angle, and calculate the polarization vector through the polarization angle measured by the polarization sensor; according to the built-in clock information of the carrier Combining with the astronomical almanac to find the moon in the inertial coordinate system at the current moment i Department of expression m i , and using astronomical sensors to measure b Department and i The astral vector under the system, constructed by i Department and b The transformation matrix between systems, combined with this transformation matrix, will m i convert to b Get under the system m b , as the moon vector in b The nominal value under the system; the polarization angle error is used as the state quantity, combined with the inertial navigation error equation, the state vector is defined x , and then establish the state equation; establish the nominal value of the moon m b The relationship equation between the polarization angle error and the observation point, and linearize the equation, so as to establish the measurement equation and estimate the polarization angle error.

Description

technical field [0001] The invention belongs to the field of navigation, and relates to a nighttime sky polarization angle error correction method based on starlight vector information, which can be used for fully autonomous navigation of an unmanned moving carrier in an environment where electromagnetic interference exists at night in an aircraft in a complex environment, resulting in failure of satellite signals. Improve aircraft survivability. Background technique [0002] The ambient light at night is dark and has the advantages of good concealment. The ability of autonomous navigation at night is related to the flight safety of the aircraft and is of great significance for the effective completion of flight tasks. At present, the establishment of the GPS system in the United States and the BDS system in China has made the satellite navigation system widely used, but it relies too much on communication signals, making it easy to cause navigation information to fail when ...

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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