33DD Air Defense destroyer
In the line of DDs, Japan will follow up with a new class of 33DD destroyers designed by Kawasaki Heavy Industries. The 30DEX and 33DD are two different programs that will be developed and built together. The lead ship of Kawasaki 33DD will be budgeted in FY2021 and launched in 2024. It would have a slightly larger displacement than 25DD with an integrated mast and feature a CFRP hull. 33DD is different from either 30DEX Destroyer Escort Xperimental (3000t Type; equivalent of Abukuma DE) or Future Trimaran Patrol Combat Ship (2000t Type; equivalent of Hayabusa PG). All three belong to different combatant categories and though they are being designed/built together. Mitsubishi 30DEX is a smaller ship and has no VLS, being built purely as an ASW escort ship. Lighter armament, but fast and stealthy. DDR, on the other hand, will be able to multirole including AAW with better radar and missile armament developed by Japan. It's a new destroyer being developed to meet the requirement of DD successors after, and also based on, Akizuki class DD.
The next-generation escort ships are required for missions under a more threatening environment than coastal defense. Therefore, electronic warfare, radar and communication antenna etc. are planarized, the mast is simplified. It is necessary to have a stealth structure taking into consideration such a conversion for removing the blind areas caused by the mast etc. shipboard structure, etc. It is necessary to flatten the antenna.
It is also expected to grow in the future, in order to easily cope with the addition of the antenna function, high performance of various antennas, broadening of the bands, it is necessary, in addition, to improve the survivability, together with the improvement of the electronic warfare ability and detection ability. It becomes necessary, therefore, according to the operation scene, the electronic warfare and the function of radars. It is necessary to make each module multifunction so that it can be allocated in a distributed manner.
To cope with many missiles that fly in the electronic warfare, simultaneous multiple targets. It is necessary to realize an arbitrary opening surface division that allows interference with respect to the transmitting surface. Antennas in which the array of antenna elements can be reconfigured to suit a multitude of system functions, such as radar, electromagnetic warfare (EW) and communication, are often referred to as `common aperture antennas`.
Generally, such common aperture antennas receive and transmit radio waves over a wide range of frequencies. The antenna architecture must perform a combination of radio frequency (RF) and optical beam-forming functions, such that each of the system requirements can be met. For example, electronic surveillance measures (ESM) relies on the analysis of multiple beams whereas communication generally only requires a single beam to be transmitted or received.
Over recent years, the concept of aperture integration where many functions are performed by a common aperture, rather than using separate antennas for each function, has been considered and the following is a list of some of the potential benefits: improved integration of different functions, such as radar and communication; reduced blockage problems between operation of different antenna requirements; reduction of radar cross section (RCS); better use of antenna positional and volume constraints including reduced weight and reduced drag; and reduced costs to build and maintain.
However, in order to realise these potential benefits the following problems need to be solved: how to amalgamate all the beam-forming requirements of the many diverse functions into a single architecture; how to amalgamate in a cost effective way that minimises the amount of hardware duplication; how, to incorporate the required flexibility into the architecture that allows rapid selection of any of the required system functions; how to share simultaneously the aperture between as many functions as possible; how to enable digital signal processing to be used over a wide frequency bandwidth, within the constraints of available analogue to digital (A/D) devices; how to operate over a wide frequency bandwidth with most functions only requiring a narrow instantaneous bandwidth; and how to manage resource sharing between transmit and receive functions.
In the research prototype to be implemented from FY 2011, the future low RCS converted warship integrate electronic warfare and surface radar functions among integrated antenna systems. This will conduct research on integrated radio system. Consider technical issues and manufacturing period, and result in policy evaluation. In consideration of this, the research prototype period is required for about 3 years. Also, as far as possible this project, in order to obtain research results in a short period of time, the examination period is set to about 2 years, and the technical plan was to clarify the problem efficiently.
Regarding expenses, similar project "Research and prototype of multi-function RF sensor" (Based on the results of FY 2002 - FY 2008), compare and examine the corresponding parts. The research expenses are calculated by multiplying by the scale ratio, which is a reasonable expense. For the aircraft and ships that are anti-ship missile platforms, it is possible to reduce detectability and reduce the threat level of the enemy. Integration of the antenna, broadband, and shared open that enables arbitrary aperture divisionIncreasing in the future by equipping an integrated radio system with a mouthIt is possible to easily deal with the addition of the antenna function expected to be expected.
Various antennas are optimally arranged to eliminate the blind area, and the upper structureIn things, by controlling the appropriate antenna placement and radio wave emission time, each is possible to secure the required performance of the wave system. At the Technical Evaluation Committee, various antennas are integrated and flattened. And the opening of the common opening is a matter of stealthy superstructure in the warship is considered to be effective at the moment for the next generation escort ship. The necessity of this project was evaluated as understandable.
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