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Ship astronomical positioning method without height angle observation

An astronomical positioning and altitude angle technology, applied in the field of astronomical navigation, can solve the problem of being limited by the observation period of the water antenna, and achieve the effect of providing a wide range of positions, reducing the computational complexity, and simplifying the observation instruments.

Active Publication Date: 2018-10-12
TIANJIN UNIV
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Problems solved by technology

It can overcome the problem that the use of traditional astronomical positioning is limited to the observation period of the water antenna

Method used

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  • Ship astronomical positioning method without height angle observation
  • Ship astronomical positioning method without height angle observation
  • Ship astronomical positioning method without height angle observation

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Embodiment Construction

[0051] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0052] For the current astronomical positioning of ships, the acquisition of the altitude angle of celestial bodies is often affected by the limited observation period of the water antenna (only visible in the morning and dusk, with shadows), which makes the traditional astronomical positioning technology unable to be used at night. The invention utilizes a compass instead of a sextant to observe celestial bodies. By obtaining the azimuth angles of three or more celestial bodies at the same time, it replaces the traditional astronomical positioning principle based on the observation of the elevation angle of the celestial bodies. It is not necessary to use a sextant to observe the water antenna and the celestial body at the same time. At night...

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Abstract

The invention discloses a ship astronomical positioning method without height angle observation. The method comprises A, establishing astronomical positioning coordinates, B, deriving a preliminary formula of a ship astronomical positioning method based on an astronomical triangle, C, deriving a ship astronomical positioning novel method mathematical model formula through vector transformation andcoordinate transformation, and D, solving the ship astronomical positioning novel method mathematical model formula through value iteration to obtain the latitude and longitude of the ship at the observation time. A compass replaces a sextant to observe the celestial body. The method utilizes a process for acquiring azimuth angles of three celestial bodies at the same time to replace the traditional astronomical positioning principle based on celestial height angle observation and is free of the sextant for simultaneously observing the water-sky-line and celestial bodies. At night, when the celestial body is visible and the water-sky-line is not visible, the ship position can be determined through observing the celestial body. The method solves the problem of the preferential use time period of the existing ship astronomical positioning, can be used for ship positioning at night and can well ensure the safe operation of ships.

Description

technical field [0001] The invention relates to the technical field of astronomical navigation, in particular to a method for astronomical positioning of ships without elevation angle observation. Background technique [0002] Astronomical navigation and positioning is a technology and method that uses natural celestial bodies such as the sun, moon, planets, and stars as navigation beacons, and uses the horizon coordinates of celestial bodies as observations to determine the geographic location and orientation of the measurement point. It uses celestial bodies as a navigation reference, is a completely autonomous navigation method, and has strong anti-interference ability. It can make up for the shortcomings of GPS and satellite navigation and positioning, and can be used as their effective supplement and replacement in many cases. [0003] The principle of traditional ship astronomical positioning technology is to use the water antenna as the horizontal reference, and base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/20G01C21/02G01C21/08
CPCG01C21/02G01C21/08G01C21/203
Inventor 宋菲菲翟京生张亮
Owner TIANJIN UNIV
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