| 摘要 |
<p>Acquired signals representing samples of propagating wavefields are processed using space-time linked variable methods (Figure 5A) to form images having better definition and resolution than may be obtained by conventional methods. Frequencies accessed include those anticipated as well as some apparently beyond those deemed feasible according to the Nyquist criteria as well as those present in the wavefield source. The signals and physical features may be obtained in tomography (medical CT scans), echo location (radar or sonar) or seismic imaging for example. Signals are processed (Figure 8) maintaining interrelation of the linked variables of time and space, rather than following the conventionally accepted current techniques which treat the time and space variables independently. Definition and resolution of images are obtained beyond those normally considered possible with earlier techniques by understanding and correctly interpreting the information content of a sampled wavefield. Data acquisition speed can be greatly increased, while acquisition costs are also reduced since the methods described require less data and use such data as available more effectively.</p> |
