スタビライズドレーダーアンテナシステム
Contents
1. 12. 2 2 1 2 Fig 2 Structure of antenna No 48 2005 28 lt gt AG100V gt
3. 3 3 1 3 1 1 1 Table 1 Mechanical specifications 3 Fig 3 Antenna pedestal 3 2 3 2
4. 2 0 4 0 9 _ 6 5 4 Fig 4 Block diagram of the stabilized control part 3 4 5 10 6 10 8
5. A Stabilized Radar Antenna system Tomoyasu lto Shintaro Inoue Katsumi Yazawa Motoo Sato Kouichi Morita Masanori Sudoh Shigeru Matsumoto The radar on a ship is used for marine s safety sailing and it becomes indispensable In recent years owing to the increase of small pleasure boats there is a request of the improvement of the radar performance to detect these small boats with small radar cross section On the other hand for fishing boats there are requests of the improvement of the radar performances that are close range detection performance which is to detect small targets such as buoys in the clutter of sea or rain and the radar ong range detection performance which is to watch the status of the buoy for the almadraba and the operational status of other ships in far place For these detection performance improvements it is necessary to improve not only the signal processing capability but also the radar system gain The increase of the antenna gain is effective for the improvement of the radar system gain To improve the antenna gain it is usual method to use an antenna in long length to narrow the horizontal beam width of the antenna However in this method
6. S 5V L gt 12V _ y 15V DC BP BZ DC 1 1 _DC DC 1 Fig 1 Block diagram of the Stabilized Radar Antenna system 2 2 2
7. 10 10 2 rms 6 10 4 51 5m s No 48 2005 29 3 3 4 2
8. 5 Fig 5 Axis angle errors at ship motion test No 48 2005 30 4 1 j 2 6 72 dB ul i 2 Table 2 Specification of radars kee 9410MHz eM 1 20 1 18 25 14 3 29 5 dBi 32 7 dBi LONG RANGE 15 8 kW 16 4 kW 95 dBm 95 dBm STC 1og S11 24rpm 24rpm a 2way
9. 2005 4 No 48 2005 31
10. 6 72 dB 2m 12m SS 1 8m 0 5m 0 8m 9 9m 5m 6 6 a PPI PPI 6 9 b lt b UP ret a a Current mo
11. the antenna becomes so large as not to equip the radar in the limited space on a ship To overcome these difficulties we developed a high gain antenna by narrowing the vertical beam width of the antenna Moreover we developed the new stabilized mechanism that the antenna always keeps the horizontal level In this report the overview of the stabilized radar antenna system by using these techniques is introduced 1 1
12. del radar ne NR te b b Experimental radar 6 PPI Fig 6 PPl image 7 6 a b PPI B 9 8NM 9 9NM 0 1NM 0 1NM 6 48 dB 2 6 72 dB 8 85 9 95 10 105 ENM 7 Fig 7 A Comparison o
13. f received power levels 5 1 1959 2 9 1970 3 JMA 3900 4
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