| 摘要 |
Apparatus for determining positional information for an object comprises means (22, 24) for transmitting, at a given transmission time, a probe signal towards the object; means (PG2) for generating a detection timing signal at a delay after the transmission time, corresponding to at least one selected range for the object; means (26, 46, 30; 28, 48, 32) for receiving, at a plurality of spaced apart locations, the probe signal as returned by the object; and detecting means (S1, S2; S3, S4) coupled to the receiving means and comprising a plurality of detectors, each one for detecting the returned probe signal as received at a respective one of the locations in response to a common detection timing signal; whereby the positional information for the object can be determined from the outputs of the detectors. <IMAGE> |
