频率：60hz
header:
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stamp:
secs: 1562558441
nsecs: 77637449
frame_id: imu
orientation:
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angular_velocity:
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angular_velocity_covariance: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
linear_acceleration:
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linear_acceleration_covariance: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
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^Cheader:
seq: 428486
stamp:
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nsecs: 829096888
frame_id: imu
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angular_velocity:
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angular_velocity_covariance: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
linear_acceleration:
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---