Sightline stabilisation apparatus

Details Sightline stabilisation apparatus Sightline stabilisation apparatus

G - Physics

02

B

33/37

G02B 27/64 (2006.01) F41G 1/38 (2006.01)

Patent

CA 1232443

ABSTRACT IMPROVEMENTS RELATING TO SIGHTLINE STABILISING APPARATUS In known sightline stabilising apparatus 10 (Fig, 1) a gyro-stabilised reflector 25 maintained in orientation in space about two axes 18 and 26 by gyro means in the mechanism 22. The reflector mechanism is contained in housing 17 and is pivotable about elevation axis 18 in relation thereto. The housing also carries a sensor, e.g. a tv camera providing signals to a remote (non-stabilised) image display device, and is itself rotatable in elevation relative to a platform 16 rotatable in azimuth. The apparatus is normally carried by a vehicle and movements thereof cause servo responses of the mechanism 22 to stabilise the mirror and follow-up movements of the housing and pedestal 16 restore the mirror to the centre of its limited motion in the housing. However, changes in elevation angle of the reflector cause rotation of the remote image about the centre of its field of view and motion induced changes can rapidly lead to motion sickness in an observer of the image. The improvement of the invention consists of introducing an elevation offset between the mirror and the housing so that the sensor is offset about axis 18 and has essentially the same field of view from the mirror but the image formed is rotated about its receptive axis 20. The image rotation is equal to the elevation offset of the housing/sensor and is applied as a demand signal into the housing elevation-restoring feedback loop.

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