| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase a maximum measurable radius and to surely remove secondary echoes. SOLUTION: Local oscillation signals whose frequencies are different from each other are frequency-converted into transmission frequencies by an IF signal (4, 6), they are pulse-modulated (7), and they are power-amplified (8). One is converted into horizontally polarized waves, the other is converted into vertically polarized waves, they are changed over alternately at a transmission repetition cycle (9), and they are radiated to a space (10, 11), Respective echoes are captured, and they are divided into systems 15 to 18 used to extract the echo component of the horizontally polarized waves and systems 27 to 30 used to extract the echo component of the vertically polarized waves. A inear phase detection is executed regarding outputs of the respective systems (19 to 24, 31 to 35). A phase difference is compensated regarding linear phase detection outputs of the respective systems (25, 26, 36, 37). Therefore, a maximum observation radius RMAX is set at RMAX=c/fr [where fr represents a transmission repetition frequency and (c) represents the velocity of light].</p> |
