| 摘要 |
<p>PURPOSE:To enhance the searching capacity of a ground embedded article, by providing a means for performing gain correction in front of an azimuth compression means. CONSTITUTION:The transmission signal (a) from a transmission antenna 2 is reflected from a target to be converted to a video signal of a base band through a receiving antenna 3 and a receiver 4. Sugsequently, the video signal is separated to a range direction with distance resolving power corresponding to a transmission pulse width by a range gate means 5. Necessary receiving signal data are arranged on a memory means 6 and, in order to enhance the resolving power in an azimuth direction, that is, in the advance direction of a rader apparatus, synthetic aperture processing is performed by an azimuth compression means 23. Because an underground article is an observation object in the apparatus of this kind, signal attenuation or range movement due to range migration are large as compared with the observation of the ground or the sea level. Then, a gain correction means 7 is provided in front of the means 23 to correct the attenuation of a high frequency component due to range migration. By this method, azimuth resolving power is enhanced and the searching capacity of a ground embedded article can be enhanced.</p> |
