| 摘要 |
PROBLEM TO BE SOLVED: To improve an observable limit of wind velocity without narrowing any observation coverage area. SOLUTION: A radar coverage area is segmented into two regions by a prescribed distance, and a transmission signal made of transmission pulses having a period A and a period A' is used in the short distance region (defined as a mode A), and a transmission signal made of transmission pulses having a period B and a period B' is used in the outside region (defined as a mode B). Above-mentioned modes are switched over at every one revolution in the horizontal direction, and observation results of the short distance region and the long distance region are obtained separately by using a signal processing device 16, and they are composed. That is to say, in the mode A, only the short distance region can be observed, but its outside region can not be observed, and conversely, in the mode B, the short distance region can not be observed, but its outside region can be observed. Therefore, composing both observation results eliminates the regions which can not be observed in the radar coverage area, thereby enabling the whole radar coverage area to be observed. COPYRIGHT: (C)2006,JPO&NCIPI
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