Crouzet

Grouzet

Jacques Devaud

Michel Moulin

Jean-Robert Costet

In a device for determining the direction of a line of sight, or the orientation of a sighting trihedron associated with said line of sight, defined by a magnetic azimuth angle, an elevation angle and an inclination angle determined in a reference trihedron, a sighting unit defines the sighting trihedron and a gravimetric detector measures components of the gravity acceleration vector in the sighting trihedron. A microprocessor computes the elevation and inclination angles in terms of the components of the gravity acceleration vector, and a magnetometric detector measures components of the earth magnetic field vector in the sighting trihedron. The sighting and reference trihedrons define long and cross axes and the microprocessor computes the components of the earth magnetic field vector along long and cross axes in terms of the components of the earth magnetic field vector. The magnetic azimuth angle is computed in terms of the components along the long and cross axes.

Device for determining the direction of a line of sight

A static non-swinging device for determining the course on board a vehicle comprising a magnetometer having three axes for determining the components of the earth's magnetic field along three axes connected to the vehicle, a vertical gyroscope and a computer for calculating the direction with respect to the vehicle of the horizontal component of the earth's magnetic field, wherein said magnetometer comprises on each axis a single coil having a saturable core controlled in such manner as to furnish a d-c voltage which is proportional to the component of the magnetic field along said axis.

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Chabeuil, France

Jacques Devaud