JRC REVIEW No.63 Technical Reports

- Special Issues : Marine Electronics Business-

Since the ocean conditions vary where radar is used, it is necessary to change the radar signal processing according to the conditions. JRC has developed radar signal processing which is suited to various ocean conditions, using a newly developed SoC. This signal processing, with the software signal processing technology that uses a newly developed SoC built-in DSP, has developed the detecting performance that closes to our high-tier model. The JMA-3300 Series Radar targeted for small size vessel, which employs this signal processing technologies, has achieved both downsize and highperformance without tradeoff.

Tomoharu Nojiri

- Special Issues : Marine Electronics Business-

MF/HF radio equipment is required to install to the SOLAS Convention ships as the Global Maritime Distress and Safety System (GMDSS) and is used for communication with ship stations and/or coast stations. JRC has developed the highperformance and high-reliable MF/HF radio equipment by power Amplifier digital bias controlling, Power Supply noise, efficiency, reliability improving and Antenna Tuner wishstand voltage, Circuit protection improving.

Shuji Furuta
Takeshi Okude
Masaki Tatemori
Koji Kasai

- Special Issues : Marine Electronics Business-

Tatsuyuki Takahashi

Hirofumi Tamaoki

Yuya Fujiwara

Daisuke Imai

(Universal shipborne Automatic Identification System)

- Special Issues : Marine Electronics Business-

In order to respond to the increase in the need for Internet access on vessels in recent years, JRC started sales of JUE-250 from 2007, and JUE-500 from 2009. These products provide INMARSAT Fleet Broadband service. After the sale of JUE-250/500 started, the need for high functions in the Internet access environment of vessels and for a seamless Internet land access environment has increased due to the adoption of broadband in the communication environment between vessels and land. To meet these needs, JRC has developed JUE-251/501 as the models succeeding JUE-250/500.

Compared to the JUE-250/500, JUE-251/501 achieves reduced size and weight of the onboard device, an integrated onboard system, and greatly improved network functions. With these new products, the Internet access environment on vessels is much closer to the Internet access environment on land.

Kouji Onodera
Noriyuki Shiga
Hirohisa Kusano
Katsunori Ando
Hiroshi Momose

- Special Issues : Marine Electronics Business-

The INMARSAT C Mobile Earth Station incorporating a compact omni-directional antenna is a terminal which allows message communication and data communication by a Store and Forward method. This system is equipped with capability for distress alert dissemination, and EGC (Enhanced Group Calling: International Safety and Commercial Service Messages in Broadcast Mode) functions as radio equipment suitable for the Global Maritime Distress and Safety System (GMDSS) approved by the International Marine Organization (IMO) , and it has been mounted in many vessels. JRC has developed a new Mobile Earth Station JUE-87 suitable for this system, and has confirmed a good performance on a field test.

Koji Yamada
Yoshinori Nishimura
Yoichi Nakamura
Takashi Kawabata
Hiroaki Ohtake

- Special Issues : Marine Electronics Business-

In large vessels, the equipping with various equipments have been imposed in order to achieve safe navigation, and most of these equipments have alarm functions. However, many alarm functions lead a flood of alarms, and there are cases, where the duty officer overlook important alarms, or makes wrong decisions. In order to solve such problems, an alert management system is required in the international rules of the INS (Integrated Navigation System) , DNV (Det Norske Veritas) classification and etc., as a system to centralize control of alarms and warnings of navigation equipment. JRC has been developing systems for high value added vessels according to the DNV, Lloyd's Register and etc., and has satisfied the requirements of the DNV by incorporating an alert management system into these systems.

Keiichi Hirayama
Naoki Yokoyama
Ryoichi Uchijima
Hajime Ando
Yoshiyuki Kamei

- Special Issues : Marine Electronics Business-

In display devices up until now, separate product specifications have been determined for each model, and as a result, there are differences in the user interface and operation, and the external appearance and operation have ceased to be uniform. However, if displays have roughly the same specifications, the user interface and operation in displays can be made uniform by adopting a common platform. This also allows other product models to be easily developed.

JRC focused upon this point with regard to compact displays, and thus developed platforms and applications for hardware and software by adopting uniform specifications. As a result, JRC realized uniformity of design, hardware and software.

Yasuhide Nagaoka
Yuji Koura

- Special Issues : Marine Electronics Business-

One of the technologies to realize energy saving ship operation is reduction of the frictional resistance of the ship's hull using an air lubrication method. For the first time in the world, Oshima Shipbuilding Co., Ltd., Nippon Yusen Kabushiki Kaisha and Monohakobi Technology Institute will be performing testing of frictional resistance reduction of the hull of an actual ship, a 90,000 ton class vessel of using the main engine scavenging air bypass air lubrication method. The existence of bubbles has previously been detected using an underwater camera, but it is difficult to carry this out continuously over a long period due to the turbidity of seawater. In order to check for bubbles continuously during operation, JRC has developed the "AWA System" (bubble detection system) to confirm the existence of bubbles from the bow to the stern. This report introduces this system, in which multiple echo sounding sensors, commonly used on merchant ships, are mounted on the bottom of a ship.

Toshimi Yamashita
Hideki Horiuchi
Ryo Yoshida

- Special Issues : Marine Electronics Business-

When investigating image processing methods according to the usage conditions of sonar for fishing and images of fish school, it is necessary to go to the fishing waters and record the images.

Therefore, JRC developed a system to record the signal received from the sonar on a personal computer, and reproduce the signal on the display of the sonar, so that the evaluation of the results of the changed image processing method can be performed without going to the fishing waters . This system independently can record the sonar signal, and simultaneously can record the external information related to the sonar signal, such as control signals, system status and position information.

This system can also be applied to research of the behavioral analysis of fish school and etc.

Toshimi Yamashita
Hideki Horiuchi
Yasuo Fukushima