Optical-fiber strap-down inertial measurement unit reciprocating-type two-position north finding method for inhibiting slope error influence of devices
An optical fiber strapdown and reciprocating technology, applied in the field of inertia, can solve the problems of increased system cost, poor observability, and low estimation accuracy, and achieves the goal of improving north finding accuracy, suppressing device slope errors, and eliminating device constant value errors. Effect
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Embodiment
[0096] The method described in the present invention is simulated, specifically:
[0097] (1): The simulation condition is set as
[0098] a. The time series of the alignment process is shown in Table 1;
[0099] Table 1 Time series list of north-seeking process of optical fiber inertial group
[0100]
[0101] b. The allocation of error sources in the alignment process is shown in Table 2;
[0102] Table 2 Distribution of error sources in the north-seeking process of optical fiber inertial group
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[0104]
[0105] c. The main parameters of the filter are shown in Table 3. Among them, the random slope drift error of gyro and accelerometer is set to 6.0deg / h / h and 3600μg / h respectively.
[0106] Table 3 The filter parameters of the fiber inertial group north-seeking process
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[0108]
[0109] (2) from image 3 It can be seen that the north-seeking error of the traditional heading two-position alignment method is 1432 arc seconds, but the nor...
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Description
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Application Information
- IPC
- G01C21/18; G01C25/00
- Inventors
- 芦佳振; 李保国