Space large-range azimuth automatic alignment method based magneto-optical modulation
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A technology of magneto-optical modulation and automatic alignment, which is used in measuring devices, instruments, surveying and navigation, etc., and can solve problems such as no discovery.
Inactive Publication Date: 2013-05-08
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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[0008] The above measurement methods are limited to the measurement of misalignment angles within a small angle range, but for the measurement of misalignment angles within a large angle range, no other better methods have been found so far after searching domestic and foreign literature
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specific Embodiment approach
[0076] Now in conjunction with accompanying drawing, the specific embodiment of the present invention is set forth as follows:
specific Embodiment approach 1
[0077] Specific implementation mode 1: the situation where the distance between the upper and lower instruments is fixed
[0078] When the distance between the upper and lower instruments is fixed, here in m f =0.0087rad, k=10 as an example, assume the initial u provided by the manufacturer 0 is 1.05V, the initial misalignment angle α=-60°, and the signal collected after the corresponding magneto-optical modulation is processed by low-pass filtering to obtain a signal u=7.5V, and the two positions arbitrarily selected during the rotation of the instrument are α 1 =-30°, α 2 = 45°, and they respectively correspond to the signal u obtained by low-pass filtering the signal collected after magneto-optical modulation 01 =2.5V, u 02 =5V, the angle between the two positions β=75°.
[0079] Step 1: Set up the lower instrument at any position within the range of -90° to 90°, and measure the phase comparison between the modulated signal at this position and the AC signal obtained af...
specific Embodiment approach 2
[0092] Specific implementation mode two: the situation where the distance between the upper and lower instruments is uncertain
[0093] When the distance between the upper and lower instruments is different each time it is used, due to u 0 As an unknown quantity, the precise u should be obtained first by a certain method 0 . here m f = 0.0087 rad, u 0 =1V, k=10 as an example, set the initial position of the instrument as α1 =-25°, the measured signal u obtained after the magneto-optic modulation is processed by low-pass filtering 01 =8.214V; the signal u measured after the instrument rotates β=60° 02 = 6.71V.
[0094] Step 1: On the basis of the basic alignment of the upper and lower instruments, fix the position of the upper and lower instruments before using the instrument; when any initial misalignment angle α between the upper and lower instruments 1 ∈(-90°, 90°-β), set up the lower instrument in the pre-calibrated range of 0°~180°α 1 At the initial position of +90°...
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Abstract
The invention relates to a method for realizing large-range high-precision azimuth misalignment angle measurement based on an optical intensity signal undergoing sine wave magneto-optical modulation. The method comprises the following steps: calculating through a lower apparatus to obtain accurate u0, and judging the plus-minus of a misalignment angle through comparing the phases of a modulation signal and an AC signal obtained by a high-pass filter; establishing a measurement model of the rough misalignment angle in a large-angle range according to the relationship between the misalignment angle and the signal processed by a low-pass filter, and allowing the lower apparatus to rotate in a small-angle range under the control of the rough misalignment angle signal obtained after calculation; and directly obtaining an misalignment angle signal through calculating by utilizing the extreme point in the AC signal obtained through the magneto-optical modulation by the high-pass filter, and allowing the lower apparatus to continuously rotate in a preset threshold range in order to synchronize with an upper apparatus in azimuth. Compared with the prior art, the method provided by the invention has the advantages of solution of problems comprising the accurate calculation of u0 and the rough misalignment angle measurement in the large-angle range for the first time, provision of a way for determining the plus-minus direction of the misalignment angle in a range of -90-90DEG, and extension of the transmission range of the misalignment angle.
Description
technical field [0001] The invention belongs to the technical field of angle measurement, and relates to a method for measuring azimuth misalignment angles in a large spatial range, in particular to a method for measuring azimuth misalignment angles in a large spatial range with high precision based on a sine wave magneto-optical modulated light intensity signal. Background technique [0002] The spatial azimuth misalignment angle transmission technology based on sine wave magneto-optic modulation refers to the use of light polarization and Faraday magneto-optical rotation effect to realize the transmission of horizontal azimuth misalignment angles between two upper and lower devices without mechanical connection on different horizontal planes. The development and growth of the technology will greatly promote the development of aerospace and biomedicine and other multi-technical fields. [0003] In the prior art before the present invention, the research about the spatial or...
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