High-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system

A rate-offset frequency and random noise technology, applied in the field of high-precision rate-offset frequency inertial group acceleration channel random noise estimation methods and systems, can solve problems such as inaccuracy, large fitting errors, and inability to fully present authenticity.

Pending Publication Date: 2021-04-20
HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST
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Problems solved by technology

[0014] By observing the above results, it is found that the nonlinear fitting effect of this fitting method cannot fully present the authenticity of the random noise term coefficient of the high-precision rate bias frequency inertial group acceleration cha

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  • High-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system
  • High-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system
  • High-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system

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Embodiment Construction

[0044] According to the Allan standard deviation double-logarithmic curve and the characteristics of noise correlation time, the present invention performs multi-overlap segmental adjustment on the correlation time domain, and according to the random noise components and characteristics in the correlation time domain of the high-precision rate deviation frequency inertial group acceleration channel, the correlation time is similar At the same time, in order to reduce the fitting error caused by the standard deviation of noise in adjacent sections, the random noise items in adjacent relevant time domains can be included in the nonlinear fitting during fitting. fit model.

[0045]Taking the output of a high-precision dual-axis rate-bias-frequency inertial acceleration channel corresponding to Table 1 as an example to illustrate, the correlation time of the quantization noise (QN) and apparent velocity random walk (VRW) items of the three acceleration channels is relatively small....

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Abstract

The invention discloses a high-precision rate offset frequency inertial measurement unit acceleration channel random noise estimation method and system. Random noise of the acceleration channel of the high-precision rate offset frequency inertial measurement unit is estimated according to the following formula: k=-1, -0.5, 0tau=1-30 s; k=-0.5, 0, 0.5tau=10-80 s; k=0, 0.5, 1tau=50-2900 s; sigma1(tau), sigma2(tau) and sigma3(tau) are random noises corresponding to different time periods tau; and Ak is the coefficient of the noise term. The random noise item coefficient of the acceleration channel of the high-precision rate offset frequency inertial measurement unit is estimated by using a multi-overlapping piecewise Allan standard deviation method, and the estimation result is more accurate.

Description

technical field [0001] The invention relates to the technical field of inertia, in particular to a method and system for estimating random noise of a rate-bias-frequency inertial group acceleration channel with high precision. Background technique [0002] The strapdown inertial navigation system is widely used in various complex environments due to its strong autonomy and good concealment, and has a certain application status in various fields such as sea, land, and air. The navigation error will gradually accumulate with the error of the inertial device over time, and the long-term navigation accuracy will decrease. Therefore, for many occasions that require high precision in inertial navigation applications, the rate bias frequency technology will be used to compensate the error of the inertial device. However, the application of rate bias frequency technology in inertial navigation usually uses a single frame or double frame to control the rotation of the inertial combin...

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Application Information

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IPC IPC(8): G01C25/00
Inventor 张春梅曾浩瀚
Owner HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST
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