Patent ID: 7468740

Claim:
A method for the FOV dependent LOS scanning in a turret aided continuous zoom camera with the constant f-number (f/D) where one can change the field of view (FOV) continuously, wherein the scan width is dependent on the FOV via the relation below: W s =±( m×FOV ) wherein W s is the scan width and m is the observation width constant, the mean rate of LOS scanning for half period is determined as a function of the FOV via the following relation: Ω S ⁢ = C 0 t e · tan ⁡ ( FOV 2 ) ~ C 1 t e · FOV wherein Ω s and t e are respectively the scan rate and the eye integration time, the C 0 and C 1 are proportional constants; whereby on the basis of the two equations above the FOV dependent LOS scan mechanism is expressed as follows: { Θ SCAZ ⁡ ( AZ LOS ) Θ SCEL ⁡ ( EL LOS ) } = ⁢ { ( m · FOV ) ⁢ sin ⁡ [ tan ⁡ ( FOV 2 ) n ⁡ ( t e ) · m · FOV ⁢ t EL LOS ] + AZ LOS } ( Equation ⁢ ⁢ 14 ) wherein Θ SCAZ and Θ SCEL are respectively the azimuth and elevation angles of LOS vector, The AZ LOS and EL LOS are the initial reference position of LOS in the azimuth and elevation angles, and, the n(t e ) is expressed as C′/t e with constant C′.