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A method for ship astronomical positioning without altitude 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, simple observation instruments, and ensuring safe operation.

Active Publication Date: 2022-04-15
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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  • A method for ship astronomical positioning without altitude angle observation
  • A method for ship astronomical positioning without altitude angle observation
  • A method for ship astronomical positioning without altitude 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 altitude angle observation: step A, establishing astronomical positioning coordinates; step B, deriving the preliminary formula of the ship astronomical positioning method based on the astronomical triangle; step C, deriving by vector transformation and coordinate transformation The mathematical model formula of the new method of astronomical positioning of ships; step D, numerically iteratively solve the mathematical model formula of the method of astronomical positioning of ships, and obtain the latitude and longitude of the ship at the observation time. The invention utilizes a compass instead of a sextant to observe celestial bodies. By obtaining the azimuth angles of three celestial bodies at the same time to replace the traditional astronomical positioning principle based on the observation of the elevation angle of celestial bodies, there is no need to use a sextant to observe the water antenna and celestial bodies at the same time. At night, when the celestial bodies are visible and the water antenna is invisible. , you can still observe celestial bodies to determine the position of the ship. In this way, it overcomes the problem of priority use period for astronomical positioning of ships in the past, and can be used for ship positioning at night to better 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 Patents(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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