Inertial unit with several detection axes

An inertial unit for the measurement of accelerations and/or rotations comprising:

• at least four sensors, at least one of which is an accelerometer, distributed by pairs on at least two intersecting axes, including a first pair of sensors on a first axis and a second pair of sensors on a second axis, the second axis intersecting the first axis, each sensor comprising two inertial masses, each inertial mass comprising a moveable excitation part and a moveable detection part, the moveable excitation parts of a sensor being separate from those of the other sensors, the two inertial masses of each sensor being mechanically coupled by an intra-sensor coupling structure,
• excitation means for exciting the excitation parts of the sensors and
• detection means for detecting the movement of the detection parts,
• a control unit to control the excitation means and to control the detection means,
• a mechanical inner-sensor coupling structure between the four sensors, said inner-sensor coupling structure being elastically deformable and able to transmit the excitation vibrations from one axis to the other,
• wherein at least one of the intra-sensor coupling structures is a strong coupling means.