(Luft) Lockheed Martin F-35 - Lightning II

[ObiBiber]

passt hier ganz gut rein da die F35 wohl in der engeren Auswahl steht:

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Stealth in a platform is defined as the ability to operate without being detected, or that it is capable of affecting adverse weapon systems. To study stealth, it is essential to evaluate the aircraft’s radar cross section (RCS), which can be used to infer how well the machine is visible to surveillance, monitoring and target tracking radar. Radar cross-section varies significantly depending on the location of the transmitters, radar, engine and radar receivers, and radar signal wavelength and waveform used.

Radar signals are reflected and scattered in a different way in different directions. Therefore, the radar signal received varies significantly, depending on the direction from which the radar “sees” the aircraft. Stealth surface design and materials contribute substantially to the way the signal is reflected and scattered in different directions. The shape of the aircraft design is most affected because it determines the direction in which the radar signal is reflected. The surface material is designed to attenuate reflected and scattered signals. Radiation-absorbing material (RAM) is placed in places of particular interest, which could reflect and scatter signals in undesired directions. These include, for example, air inlets and wing leading and trailing edges.

Stealth aircraft are usually designed for the frequency ranges used by the computer-designed radar operating systems. Protection against detection may not be as good in other frequency bands.

Future advanced radar systems will be based on the benefits of different radar signals, known as signal diversity. Using a wide signal diversity provides advantages to produce a radar transmitter and receiver with decentralized location, multi-frequency utilization, the waveforms used the flexibility and utilization of polarization variations in the radio-frequency signals. Since stealth features depend primarily on aircraft design, a distributed radar system can be used to achieve a clear advantage for the detection and separation of stealth aircraft.

The simulations clearly showed that, at low frequencies, the radar detects stealth aircraft much earlier than higher frequency radars. Although the range resolution of low-frequency radar is generally lower, and their positioning less accurate, they can provide a rough estimate using a higher-frequency radar signal or other sensors, allowing more accurate monitoring of a target to be achieved.

In addition, at the lower radar frequencies the added benefit of stealth features is lower, due to the different types of aircraft detection, and tracking range was not as significant as the difference between the high-frequency radars. This supports the very information that for stealth aircraft the design emphasis has been on reducing the detectability of the aircraft by the most commonly used radar at higher frequencies.

As early detection of a radar signal receiver allows more decentralized stealth aircraft detection while traditional radar does not detect it.

Stealth design benefits depend on the location of radar transmitters and receivers relative to each other and to the aircraft. Thus, the aircraft flight path is also of great importance to its detectability. It may be noted, however, that the multi-spot radar is able to detect and monitor existing stealth aircraft to explore further afield.

By simulating the results obtained, MIMO radar has increased the likelihood of detection of an aircraft in a controlled area by about 30 percentage points compared to traditional autonomous radar. However, the importance of this fact in air warfare depends on many other factors. It is also noted that sometimes, from the stealthy object’s point of view, it is sufficient that it be influenced, even if it is not detected. If the radar system receives returns that it cannot track, or on which missiles are unable to lock on, the situation is turns to the advantage of the stealthy aircraft.

The life cycle of fighter aircraft is very long. The Hornet replacement fighter is now already in production, and the fighters we purchase will be used for several decades. An aircraft’s basic design is determined at the time of its acquisition, but sensors evolve over the years, so any assessment of the various options for the future fighter must also take into account how radar and other sensor technologies will develop.

Further research leads us to support the preparation of the fighter procurement by providing research-based information on the development of sensor technologies in the 2030s.

die Finnen haben sich hier sehr viele Gedanken zu der Weiterentwicklung der Radartechniken gemacht...auf den langen EInsatzzeitraum eines neues Flugzeugmusters bezogen.
Die Vorteile eines Stealthflugzeuges scheinen Aktuell sehr ausschlaggebend für die Beschaffungsentscheidung vieler Nationen sein...jedoch ist dies sehr kurzfristig gedacht.... in wenigen Jahren kann dieser Hauptvorteil dieser 5th Gen Fighter durch eine schnellere Weiterentwicklung der Radartechnik wieder dahin sein.
Deswegen wollen die Finnen bei ihrem Auswahlprozess die Radramöglichkeiten im Jahr 2030 berücksichtigen...
mal gespannt wie das weiter geht.... und ob man trotzdem zu dem Schluß kommt dass die F35 die beste Wahl ist, oder doch ein anderes Muster!?
aber meiner Meinung nach generell die richtige Herangehensweise