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Gasture estimation and interfusion method based on strapdown inertial nevigation system

A strapdown inertial navigation and attitude estimation technology, applied in the navigation field of strapdown inertial navigation system, can solve the problems of reduced system reliability, increased system cost, inability to use external information sources, etc.

Inactive Publication Date: 2006-10-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

However, the use of higher-precision inertial devices will double the cost of the system, which is unacceptable in many application fields
If an external information reference source is used, it will not only increase the system cost and reduce the autonomy of the system, but also suffer from more interference and reduce the reliability of the system
In addition, effective external information sources cannot be used in some complex application environments

Method used

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  • Gasture estimation and interfusion method based on strapdown inertial nevigation system
  • Gasture estimation and interfusion method based on strapdown inertial nevigation system
  • Gasture estimation and interfusion method based on strapdown inertial nevigation system

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Embodiment 1

[0091] The hardware composition of the strapdown inertial navigation system in this embodiment is the same as that of the traditional strapdown inertial navigation system. Such as Figure 5 As shown, this embodiment includes the following steps:

[0092] (1) Use the sensor in the six-degree-of-freedom inertial measurement unit (IMU for short) to sense the movement of the carrier: the IMU senses the angular velocity signal of the moving carrier along its axis through the gyroscope, and measures the linear acceleration signal along the axis of the carrier through the accelerometer, and transmit the signal to the navigation computer;

[0093] (2) Strapdown inertia calculation: the navigation computer calculates the attitude of the angular velocity signal sensitive to the gyroscope, and performs trigonometric function calculation on the attitude matrix to extract the attitude angle and azimuth angle of the carrier. The acceleration measured by the accelerometer is calculated by ...

Embodiment 2

[0158] Embodiment two: the step in the present embodiment is basically the same as the step in the embodiment, and the difference is that the basic conditions that the system attitude estimation method is set in the step (4) are:

[0159]

[0160] where f bx f by f bz Indicates the output value of the three-axis accelerometer; f nz Indicates the vertical acceleration of the system in the geographic coordinate system, X 1 x 2 Y 1 Y 2 Respectively denote the thresholds for the pose estimates used by the system.

Embodiment 3

[0162] When the system has other external navigation information sources, such as GPS, odometer, atmospheric velocity computer or magnetic heading sensor, the system can still use the attitude estimation value of the accelerometer to further improve the system attitude accuracy. The basic steps are the same as in Embodiment 1. Basically the same, the difference is that in this embodiment, the system can perform data fusion with one or more external navigation information, so as to further improve the accuracy of the system to meet the requirements of more application occasions. When the strapdown inertial navigation system is assisted by external navigation information, it is usually called an integrated navigation system. The attitude estimation method of the accelerometer of the present invention can also be applied in the integrated navigation system, and its system software flow chart is as follows Figure 14 shown.

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Abstract

The invention discloses a state estimating and interfusion method based on strap down inertial navigation system that includes the following steps: using the sensor in IMU to induce the kinetic characteristic; taking strap down inertial computing; using the state signal of acceleration estimating system; judging the reliability of state estimating value; taking state information interfusion; outputting navigation parameter. The invention has the following advantages: no additional hardware cost, fully autonomy; effectively improving the navigation accuracy of the system; and supplying 50 navigation signals per second to control display device.

Description

1. Technical field [0001] The invention relates to a navigation technology of a strapdown inertial navigation system, in particular to a method for estimating attitude of a strapdown inertial navigation system by using acceleration. 2. Background technology [0002] The Strapdown Inertial Navigation System (SINS for short) is based on Newton’s relative inertial space mechanics law, using gyroscopes, accelerometers and other inertial components to feel the acceleration of the running body, and the posture of the moving body is obtained through the integral operation of the computer , speed and position and other navigation parameters. Among these navigation parameters, the attitude parameter error will directly affect the accuracy of other parameters, so it is more important to improve the attitude measurement accuracy. [0003] The guidance accuracy of SINS mainly depends on the accuracy of inertial devices (gyroscope and accelerometer). The accuracy of the INS is excellen...

Claims

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Application Information

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IPC IPC(8): G01C21/16G01C21/18
Inventor 杜亚玲刘建业陈磊江孙永荣黄凯许卫东祝燕华曾庆化
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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