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Measurement method for initial speed of polar area navigation mode of inertial navigation system

A technology of inertial navigation system and initial speed, which is applied in the field of polar area navigation of inertial navigation system to solve the initialization problem, the measurement method is simple and convenient, and the effect of reducing errors

Inactive Publication Date: 2013-11-13
HARBIN ENG UNIV
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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a method for measuring the initial speed of the polar region navigation mode of the inertial navigation system, aiming at solving the problem of initializing the speed information when the inertial navigation system is transferred from the normal mode to the polar region mode

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  • Measurement method for initial speed of polar area navigation mode of inertial navigation system
  • Measurement method for initial speed of polar area navigation mode of inertial navigation system
  • Measurement method for initial speed of polar area navigation mode of inertial navigation system

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specific Embodiment approach

[0078] Step 1, when the inertial navigation system travels to a latitude of 70 degrees, it starts to switch from the normal mode to the polar mode;

[0079] Step 2, collecting the position information output by the normal mode of the inertial navigation system: longitude λ and geographic latitude L;

[0080] Step 3, measure the longitude difference δλ between the position of the inertial navigation system and the 90° east longitude:

[0081] δλ=|λ-90|

[0082] Step 4, use the latitude information L in step 2 to calculate the auxiliary coefficient W:

[0083] W = 1 - e 2 sin 2 L .

[0084] Step five, using W in step four to measure the rotation angle θ between the geographic coordinate system and the horizontal geographic coordinate system:

[0085] θ = arctan ...

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Abstract

The invention discloses a measurement method for the initial speed of a polar area navigation mode of an inertial navigation system. The measurement method comprises the following steps: collecting output information of the inertial navigation system under a normal mode; measuring the difference of longitude between the inertial navigation system and east longitude 90 degrees; calculating an auxiliary coefficient W; measuring a corner between a geographic coordinate system and a transverse geographic coordinate system; calculating a direction cosine matrix between the geographic coordinate system and the transverse geographic coordinate system; measuring the initial speed of the polar area mode of the inertial navigation system. A conversion matrix between the normal mode of the navigation coordinate system and a polar area mode of the navigation coordinate system is determined on the basis of an earth ellipsoid model; an error of obtaining the conversion matrix when the earth is simply simulated by a conventional sphere is avoided, so that the error of mode conversion of the inertial navigation system is reduced. Initial speed information required by the polar area mode can be measured just by the output information of the inertial navigation system under the normal mode; other external equipment and information are not needed, so that the measurement method is simple and convenient; the practical application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of polar region navigation of an inertial navigation system, and in particular relates to a method for measuring the initial velocity of a polar region navigation mode of an inertial navigation system. Background technique [0002] Inertial navigation system is very important to ensure the navigation and operation of ships and aircraft in polar regions. However, the fixed north azimuth inertial navigation system commonly used in our country at present cannot be used in polar regions due to its mechanical arrangement. In order to overcome the shortcoming that the above-mentioned mechanical arrangement of the inertial navigation system cannot perform navigation calculations in polar regions, researchers in the field of navigation have designed free azimuth and swimming azimuth mechanical arrangements. The free azimuth system and the swimming azimuth system have taken measures on the azimuth command of the pla...

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Application Information

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IPC IPC(8): G01C21/16
Inventor 奔粤阳鲍桂清尹冬寒赵维珩阮双双杨祥龙叶攀
Owner HARBIN ENG UNIV
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