A method for estimating the landing point accuracy of inertial measurement system based on rocket sled test

An inertial measurement and rocket sled technology, which is applied in the field of rocket sled test landing point estimation, can solve the problems of high consumption and high cost of rocket sled tests, and achieve the effects of saving manpower, improving accuracy, and avoiding tedious calculations.

Active Publication Date: 2017-05-10
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

This method requires multiple measurements to accurately obtain the accuracy value of the landing point, which requires more time and financial support. Considering the high consumption and high cost of the rocket sled test, this method is difficult to implement

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  • A method for estimating the landing point accuracy of inertial measurement system based on rocket sled test
  • A method for estimating the landing point accuracy of inertial measurement system based on rocket sled test
  • A method for estimating the landing point accuracy of inertial measurement system based on rocket sled test

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Embodiment Construction

[0041] Because the rocket sled test requires a lot of manpower, material resources, and financial resources, it cannot be repeated in a large amount. The accuracy of the landing point is a statistical method. Only after a large number of tests can more accurate results be obtained. In view of the contradiction between these two aspects, the method proposed by the present invention uses one-time test data to estimate the accuracy of the falling point, which can greatly save costs. The estimated result of the falling point range obtained is the distance value, which is consistent with the rocket sled test result, and is better than before. The use of circular probability error (CEP) and ball probability error (SEP) to describe the accuracy of falling points is more suitable for rocket sled testing.

[0042] In a rocket sled test, the displacement and velocity values ​​obtained by the navigation solution of the inertial measurement system on board usually do not match the actual valu...

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Abstract

The invention discloses a drop point precision estimation method for an inertia measurement system based on a rocket sled test. According to the method, a distance error variance changed along with the time is obtained by utilizing a known error coefficient standard difference and a relevant coefficient matrix as well as an angular speed and an acceleration, which are measured in the rocket sled test, of a rocket sled body; then a drop point precision estimation formula of the rocket sled test covering 50 percent of the drop point range can be obtained by formula derivation and calculation. According to the drop point precision estimation method for the inertia measurement system based on the rocket sled test, the drop point estimation in one direction is only executed, so that complicated calculation of estimation in multiple directions is avoided, an estimation result is quickly obtained, and the accuracy of estimation is improved.

Description

Technical field [0001] The invention relates to a method for estimating the accuracy of a falling point, in particular to a method for estimating the accuracy of a falling point of an inertial measurement system in a rocket sled test, and can be used in the field of estimation of the falling point of a rocket sled test. Background technique [0002] The rocket sled test has the ability to produce comprehensive conditions such as large overload, high speed, strong vibration and shock, and can simulate the real flight environment of the missile most realistically. Rocket sled test refers to the inertial measurement system mounted on the rocket sled, through the test to assess the performance indicators and accuracy of the inertial measurement system under comprehensive environmental conditions, and verify the correctness of the inertial measurement system error model under high dynamic conditions. In the case of large overload, the amplification of high-order terms can determine th...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 魏宗康刘璠
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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