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Inertial navigation system alignment accuracy evaluation method

An inertial navigation system and alignment accuracy technology, applied in the field of inertial navigation systems, can solve the problems of inability to achieve effective evaluation of azimuth misalignment angle, lack of quasi-accuracy evaluation research, and limitation of azimuth alignment performance, so as to reduce the amount of filter storage, The effect of reducing the amount of data read and enhancing the robustness

Active Publication Date: 2017-05-10
哈工精密技术(深圳)有限公司
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Problems solved by technology

However, there is no research on the evaluation of alignment accuracy under the condition of large azimuth misalignment angle
In recent years, when the inertial navigation system is aligned under the condition of a real large azimuth misalignment angle, due to the limitation of azimuth alignment performance, the residual attitude misalignment angle after alignment still shows a large azimuth misalignment angle. The actual model of the system is nonlinear, and the effective evaluation of the azimuth misalignment angle cannot be achieved if the existing alignment accuracy evaluation method is applied
On the other hand, the calculation of the fixed interval smoothing algorithm is carried out after the filtering solution, which needs to store a large amount of data, and the calculation efficiency is poor

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] The flow chart of an inertial navigation system alignment accuracy evaluation method proposed by the present invention is attached figure 1 As shown, the main steps of the method are as follows:

[0038] Step 1: Complete the warm-up preparation for the inertial navigation system and the differential GPS system, install the differential GPS receiving antenna and the inertial navigation system on a common base at close range, complete the initial alignment of the inertial navigation system, and complete the alignment accuracy in an external computer Evaluation of initialization of filters and smoothers;

[0039] Step 2: The inertial navigation system performs navigation calculation, synchronously collecting the differential GPS output speed, and the east speed, north speed, longitude, latitude, attitude matrix calculated by the inertial navigation system, and ...

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Abstract

The invention discloses an inertial navigation system alignment accuracy evaluation method. The method comprises the following steps: with differential GPS speed as external reference base, constructing an inertial navigation system alignment accuracy evaluation observation quantity, and performing extended Kalman filter calculation in combination with an inertial navigation system alignment accuracy evaluation nonlinear model; after each extended Kalman filter calculation cycle, inserting the calculation of an extended fixed-interval smoothing gain matrix, and storing the filter data in real time until the filter calculation is over; and performing reverse extended fixed-interval smoothing calculation by use of the stored filter data, and estimating the attitude misalignment angle at the moment when the inertial navigation system alignment is over to realize evaluation of the inertial navigation system alignment accuracy. The method can realize inertial navigation system alignment accuracy evaluation in the conditions of large azimuth misalignment angle and small misalignment angle, and has the advantages of strong robustness, small data storage capacity and high calculation efficiency.

Description

Technical field [0001] The invention relates to the field of inertial navigation systems, in particular to a method for evaluating the alignment accuracy of an inertial navigation system with strong robustness. Background technique [0002] The inertial navigation system has high-precision attitude measurement, speed measurement and positioning functions. But as a dead reckoning method, the inertial navigation system must be initially aligned to complete the initialization of the inertial navigation system. The most critical thing in the initial alignment is the attitude alignment, which is to align the solution coordinate system of the inertial navigation system to the northeast sky coordinate system. The most effective way to measure the alignment performance is to evaluate the alignment accuracy performance and obtain the attitude misalignment angle at the end of the alignment, that is, the attitude deviation angle of the inertial navigation system's solution coordinate syste...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C21/16
Inventor 陈岱岱杨显清陈焕龙刘华坪马志军李婷婷石丹游志全
Owner 哈工精密技术(深圳)有限公司
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