Method and apparatus for maintaining far field spatial coherency

Details Method and apparatus for maintaining far field spatial coherency Method and apparatus for maintaining far field spatial coherency

1974-12-30

1976-07-06

Wilbur, Maynard R.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250199, 250553, 250203R, 350295, 356152, G01C 308, G01B 1126

Patent

active

039678997

ABSTRACT:
A system for controlling the relative phasing of a plurality of transmitting subapertures such that the energy transmitted therethrough is in phase at a distant location. In accordance with the invention, the transmitting subapertures are sequentially controlled so as to apply phase perturbations to different orthogonal spatial sets thereof; and in response to received reflected energy the relative size of the phase error is computed for each set and compensating phase offsets are provided.

REFERENCES:
patent: 3202991 (1965-08-01), Howells
patent: 3346738 (1967-10-01), Rogers et al.
patent: 3644043 (1972-02-01), Jones et al.
patent: 3691483 (1972-09-01), Klein
patent: 3731103 (1973-05-01), O'Meara
patent: 3764213 (1973-10-01), O'Meara
patent: 3825845 (1974-07-01), Angelback et al.
patent: 3878520 (1975-04-01), Wright et al.

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