| 摘要 |
<p>Electronic detector-array synthesis techniques provide fast, precise and accurate digital control of electronic zoom for electro-optical scanning systems. The output signals (34) of exponentially-spaced detectors (52-67) are first added to synthesize (38) several binary-sized groups (1x-n, 2x-n, 4x-n, 1/2x-n, 1/4x-n) of n equivalent detectors (for n recording channels). These groups (40) are sequentially selected (42) by multiplexers (106) controlled by the most-significant bits (m.) of the size-control word (m.c). The selected group (44) of signals are interpolated (46) by a voltage-divider network (or by time-division multiplexer network) over a size variation of a factor of two, controlled by the least-significant bits (.c) of the size-control word (fig 13). Scaling is provided by sampling (136), digital conversion (140) and temporary storage (144) of the n signals (48) at a rate directly proportional to instantenous range R (H/COS(A)). The n synthetized detector signals (142) are stored and converted back to analog signals at a constant rate for display or recording. <IMAGE></p> |
