Polarized light navigation algorithm based on dielectric film polarization right-angle beam-splitting prism
A beam splitting prism and navigation algorithm technology, applied in the field of polarized light navigation, can solve the problems of reducing polarization navigation accuracy and system error, and achieve the effect of eliminating gain multiples and reducing system error.
Active Publication Date: 2017-05-10
QUFU NORMAL UNIV
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However, the design of polarizing beam-splitting prism with dielectric film also has its limitations. The characteristics of the beam-splitting prism itself will lead to large systematic errors in the navigation polarization degree P and the polarization azimuth angle φ. This is mainly because the beam-splitting ratio of the polarizing beam-splitting prism is not is 1 and the beam splitting ratio fluctuates with the wavelength, which is often ignored in the current system design
Taking the conventional dielectric film polarization right-angle beam splitter prism as an example, the p light transmittance is 95% and the s light reflectance is 99%. %, about 6% of the maximum polarization degree of the sky under clear skies, and about 15% of the maximum polarization degree of the sky under cloudy weather, which significantly reduces the accuracy of polarization navigation
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[0047] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0048] Such as Figure 1 As shown, the sunlight scattered by the atmosphere enters the two polarization detection channels as the background light of the sky. The channels are equipped with a collimation and reduction filter module. After the vertical incident polarization beam splitter prism, the beam is split into two beams of light with vertical polarization direction, which respectively enter the detection window of the photodetector with the converging lens, and the detector converts the light intensity signal into an electrical signal. Compared with the orientation of the beam-splitting prism in the first channel, the orientation of the beam-splitting prism in the second channel is rotated by 45° around the axis of the optical path, defining the detector of the first channel to correspond to the polarized light vibration orientation φ 11 =0 o , then φ...
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The invention discloses a polarized light navigation algorithm based on a dielectric film polarization right-angle beam-splitting prism. The navigation algorithm is applicable to a double-channel polarized light navigation system adopting the dielectric film polarization right-angle beam-splitting prism. The algorithm eliminates navigation parameter calculation errors caused by a splitting ratio of the dielectric film polarization right-angle beam-splitting prism not equal to 1, and can also decrease the influence of weather changes on navigation precision, thus increasing the navigation precision of the navigation system using the dielectric film polarization right-angle beam-splitting prism.
Description
technical field [0001] The invention relates to the field of polarized light navigation, in particular to a polarized light navigation algorithm based on a dielectric film polarization right-angle beam splitter prism. Background technique [0002] The Rayleigh scattering of sunlight by the atmosphere causes the scattered light in the sky to have partial polarization characteristics. Many organisms such as bees and sand ants use this polarization mode distribution in the sky to navigate. This polarized light navigation method does not depend on satellite navigation signals. , in some special cases, has important application value, so the research on polarized light navigation is a research hotspot at present. [0003] Among the many polarized light navigation designs, there is a method of splitting light using a right-angle beam splitter prism, and its structure diagram is shown in the attached figure 1 As shown, this method uses a dielectric film polarization right-angle be...
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IPC IPC(8): G01C21/02
CPCG01C21/02
Inventor 韩培高曹佃国马任德牛明生史萌宋连科孔祥木夏云杰
Owner QUFU NORMAL UNIV