Sun shadow global space-time positioning method based on space vector

A positioning method and space vector technology, applied in the direction of navigation calculation tools, etc., can solve the problems of large manpower and less research, and achieve the effect of saving costs

Active Publication Date: 2016-02-17
HEILONGJIANG EAST WATER SAVING EQUIP CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of global positioning, positioning is mainly achieved by means of satellites and other equipment, which requires a lot of manpower, material resources and financial resources
However, the technology of global space-time positioning based on the change of the length of the sun's shadow is still in its infancy, and there are few related studies.

Method used

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  • Sun shadow global space-time positioning method based on space vector
  • Sun shadow global space-time positioning method based on space vector
  • Sun shadow global space-time positioning method based on space vector

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Experimental program
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specific Embodiment approach 1

[0034] Specific embodiment one: the sun shadow global space-time positioning method based on space vector comprises the following steps:

[0035] The location or date of shooting can be determined by the change of the sun shadow of the reference object in the photo or video. Since sunlight is parallel light, the direct sunlight can represent all parallel light. The reference object always rotates with the earth, so a unit vector is introduced to represent the direction of the sun's rays and the reference object pointing outward perpendicular to the earth's surface. Use the opposite direction vector of the sun's rays to calculate, and after obtaining the angle between the two, use trigonometric functions and the length of the reference object to obtain the length of the shadow. Based on the above method, the longitude and latitude of the reference object or the date of the shooting day can be obtained by knowing the changing length of the shadow.

[0036] Step 1: If figure ...

specific Embodiment approach 2

[0053]Specific embodiment two: the difference between this embodiment and specific embodiment one is: the specific steps of obtaining the Cartesian coordinate unit vector in the opposite direction of the direction of sunlight irradiation in the second step are as follows:

[0054] (1) Obtain the L length of the reference object and the change length L of the shadow through photos or videos s ;

[0055] (2) The longitude and latitude (φ, β) of the point that is too direct can be obtained through the shooting date T, and the spherical coordinates are obtained according to the establishment rules of the spherical coordinate system and the motion rules of the earth The r is a radius, and the value is 1;

[0056] The earth is divided into four solar terms, vernal equinox, summer solstice, autumnal equinox and winter solstice. The sun is directly on the equator on March 21, the sun is directly on the Tropic of Cancer on June 22, the sun is directly on the equator on September 23, ...

specific Embodiment approach 3

[0058] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: in the step three, the reference object is perpendicular to the earth's surface and the specific steps of obtaining the Cartesian coordinate unit vector are as follows:

[0059] Since the Earth rotates 360° in 24 hours, the Earth rotates 15° in 1 hour and rotates in 1 minute N i minute rotates N i It is the interval time between the i-th photo and the first photo. The value of i is 1, 2, 3.....n, and the time interval between every two adjacent photos is greater than or equal to 3 minutes and less than or equal to 30 minutes. Then N i The Earth's rotation in minutes is The coordinates are obtained based on the establishment of the coordinate system, and the coordinates are all in radians, the relationship is π 180 · N i 4 = ...

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Abstract

A sun shadow global space-time positioning method based on space vector is disclosed and relates to global space-time positioning methods. The method aims at solving the problem that electric equipment, satellite and other equipment cannot be used for positioning under emergent states. The method comprises establishing a ball coordinate system by enabling earth to be equivalent to a unit ball, so as to acquire a non-linear equation in one unknown; acquiring the latitude and longitude position of a reference substance on the earth according to the non-linear equation in one unknown if the shadow length data in a photograph or a video is known, and acquiring the latitude and longitude position of the direct solar radiation point if the latitude and longitude position of the reference substance on the earth is known. The method possesses the advantages of being time-saving, labor-saving, cost-saving and the like, can realize positioning without satellite or other equipment under an emergent state, and possesses significant meaning on aspects of global positioning, military reconnaissance and the like. The method is applicable to the field of global space-time positioning.

Description

technical field [0001] The invention relates to the field of global space-time positioning. Background technique [0002] The length of the shadow changes, which is related to the position of the object on the earth and the position of the direct point of the sun. There is a closed triangle between the straight line where the sun's rays lie, the straight line where the vertical height of the object lies, and the shadow. According to the relationship between the above factors and the theoretical basis, the relationship between the time and space where the object is located and the length of the shadow is quantitatively found. [0003] At present, in the field of global positioning, positioning is mainly achieved by means of satellites and other equipment, which requires a lot of manpower, material resources and financial resources. However, the technology of global space-time positioning using the length variation of the sun's shadow is still in its infancy, and there are fe...

Claims

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Application Information

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IPC IPC(8): G01C21/20
CPCG01C21/20
Inventor 刘勇李晟嘉岳冰
Owner HEILONGJIANG EAST WATER SAVING EQUIP CO LTD
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