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"Digital sonar design in underwater acoustics principles and applications, provides comprehensive and up-to-date coverage of research on sonar design, including the basic theory and techniques of digital signal processing, basic concept of information theory, ocean acoustics, underwater acoustic signal propagation theory, and underwater signal processing theory. This book discusses the general design procedure and approaches to implementation, the design method, system simulation theory and techniques, sonar tests in the laboratory, lake and sea, and practical validation criteria and methods for digital sonar design. ;"

"ABSTRAKPenerapan teknologi akustik sebagai suatu metode pendugaan kelimpahan ikandi perairan laut mempunyai banyak sekali keuntungan yang dapat membuat pengelolaan sumber daya perikanan menjadi lebih efisien dan efektif. Metode ini memanfaatkan gelombang akustik untuk mendeteksi berbagai obyek dalam air dengan menggunakan perlengkapan sonar dan echosounder, di mana energi suara ditransmisikan secara aktif dan kemudian suatu informasi disaring dari gema yang dipantulkan oleh suatu target. Informasi yang diperoleh tersebut kemudian dicatat dalam bentuk ekogram. Ekogram tersebut memerlukan adanya pemrosesan lebih lanjut untuk memisahkan target ikan yang diinginkan, karena di dalamnya juga terdapat banyak gema yang berasal dari obyek-obyek bawah laut selain ikan. Untuk itu perlu dikembangkan suatu sojrware yang dapat dengan efektif memproses ekogram secara tepat dan akurat.Skripsi ini mencoba menggunakan dekomposisi subband dengan pemfilteranWiener untuk mendeteksi ikan pada ekogram echosounder dan memisahkan target ikan dari target Iain, Parameter yang digunakan untuk membedakan ikan dengan obyek lain adalah perbedaan nilai target strength dari obyek-obyek tersebut. Acuan yang digunakan adalah hasil pemrosesan dan analisa ekogram dengan menggunakan software. Simrad EP500, yaitu suatu software yang telah banyak digunakan untuk pemrosesan ekogram dengan tingkat keakuratan yang tinggi.Hasil simulasi menunjukkan bahwa metode dekomposisi subband denganpemfilteran Wiener dapat digunakan untuk mendeteksi ikan pada ekogramechosounder dengan keefektifan mencapai 80%.

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"This text discusses various applications of space time adaptive processing, including applications in OTH-radar, ground target tracking, STAP in real world clutter environments, jammer cancellation, supper-resolution, active sonar, seismics and communications. The book provides a unique overview of the broad field of space-time processing and is divided into two parts: the first dealing with the classical adaptive suppression of airborne and space-based radar clutter, and the second comprising miscellaneous applications in other fields such as communications, underwater sound and seismics."

"This book provides comprehensive coverage of the detection and processing of signals in underwater acoustics. Background material on active and passive sonar systems, underwater acoustics, and statistical signal processing makes the book a self-contained and valuable resource for graduate students, researchers, and active practitioners alike. Signal detection topics span a range of common signal types including signals of known form such as active sonar or communications signals; signals of unknown form, including passive sonar and narrowband signals; and transient signals such as marine mammal vocalizations. This text, along with its companion volume on beamforming, provides a thorough treatment of underwater acoustic signal processing that speaks to its authors broad experience in the field."

"Pada saat ini, dunia air modelling menggunakan helikopter mini sudah banyak digemari orang. Agar dapat bernavigasi secara autonomous sebuah helikopter yang cerdas tentunya harus mampu mengenali keadaan lintasan yang akan ditempuhnya. Untuk itu diperlukan sebuah sistem navigasi yang mampu mendeteksi dan menghindari objek ? objek rintangan.Skripsi ini mengimplementasikan suatu aplikasi dari sensor sonar untuk mendeteksi objek-objek rintangan dan kompas digital sebagai sistem navigasi otomatis pada penerbangan helikopter dengan tujuan agar helikopter dapat menghindari rintangan yang ada di depannya. Untuk itu, helikopter yang dirancang harus memiliki kemampuan mendeteksi objek-objek penghalang yang bersifat statis maupun dinamis. Untuk tujuan tersebut, maka sistem ini dilengkapi dengan sebuah motor servo dc yang digunakan untuk men-scanning lingkungan lintasannya secara real time.Sensor sonar dan kompas digital yang digunakan berupa modul yang terintegrasi dengan mikrokontroler. Data yang diperoleh dikirimkan secara telemetry ke komputer untuk selanjutnya diolah dan dimonitor. Dari program, penerbangan helikopter akan dipandu agar dapat menghindari rintangan.Skripsi ini berhasil mensimulasikan sistem navigasi helikopter untuk menghindari rintangan pada cakupan 10 meter di depannya.

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The people. To navigate autonomously, a smart helycopter must can identify its path condition. For that reason, the helycopter needs a navigation system that can detects and avoids obstacle objects.This final project applys an application of sonar sensor to detect obstacle objects and a digital compass as an automatic helicopter navigation system to avoid obstacle on the face. So that, the designed helicopter must have ability to detect static and dynamic obstacle objects. Because of that, the system should be completed with a servo dc motor which is used for scanning its path environment in real time.The sonar and digital compass used in this project is a modul which is integrated to microcontroller. Data from sonar and digital compass is then sent via telemetry system to computer for later processed and monitored. From navigation program, the helycopter will be guided in order to avoid the obstacle.Finally, this final project is succeed in simulating helycopter navigation system to avoid obstacle in the range 10 metres on the face."

"Radar is a legal necessity for the safe navigation of merchant ships and, within vessel traffic services, is indispensable to the operation of major ports and harbours. Target Detection by Marine Radar concentrates solely on civil marine operations and explains how civil surveillance radars detect their targets. There are numerous diagrams and worked examples to help the reader understand the principles underlying radar operation and to quantify the importance of factors such as technical features of specific equipment, the weather, and the ability of the operator. The accuracy with which targets are positioned on the radar screen and with which their progress is tracked or predicted depends on how definitely they have been detected, and so a whole chapter has been devoted to the issue of accuracy. The various international regulations governing marine radar are examined, a brief historical background is given to modern day practice and the book closes with a discussion of ways in which marine radar may develop to meet future challenges."

"This book presents the topic of underwater real-time 3-D acoustical imaging covering the theory, algorithms and system design. It summarizes recent advances in wideband and ultra-wideband underwater real-time 3-D acoustical imaging, which will be very useful for developing next-generation systems. Through simulation techniques, readers are able to quickly learn and develop practical underwater real-time 3-D acoustical imaging systems of their own."