Someone who is smarter than you and have relevant military experience.
And I pointed this out yrs ago but it is clear that you ain't gots the brains to grasp.
So for the benefits of the readers out there...
In designing a low radar observable body, there are three rules of
CONTROL of:
- Quantity of radiators
- Array of radiators
- Modes of radiation
The aircraft itself is a radiator. When it reflects or uses its radio transmissions, it became a radiator. Everything on its body are radiators and the largest are the flight controls structures. The three rules are not so much rules that your design violate but rather that to what degrees of
OBEDIENCE of your design to the three rules.
Rule One: Control of
QUANTITY of radiators.
A 'canard' is a flight controls structure in a certain position on the body and in relation to other flight controls structures. A label does nothing in regards to radar cross section (RCS). The J-20 have 8 major flight controls structures. The F-22 have six. This make the J-20 less obedient than the F-22 in regards to rule 1. The X-36 have canards but the design have no yaw axis flight controls structures, this make the J-20 less obedient than the X-36 to rule 1 even though both designs have canards.
Another misleading argument is that 'bumpy' underside of the F-35 that supposedly made the F-35's RCS higher (or worse) than the J-20. But they failed to consider the first 'stealth' platform: F-117.
Rule Two: Control of
ARRAY of radiators.
The F-117 have those 'ridges' but they fall under rule 2: Control of
ARRAY of radiators. Each ridge is an exit point for surface traveling wave making each ridge a radiator. But all of them were designed -- arrayed -- in ways that minimizes reflections to the seeking radar. In other words, all these ridges are obedient to rule 2. Further, the F-117 have four flight controls structures making the F-117 more obedient than the J-20, F-22, and F-35, to rule 1. This is why the F-117 RCS is still secret and it is still flying to provide R/D purposes.
Rule Three: Control of
MODES of radiation.
Absorbers minimize or even eliminate radiation. Absorbers can be applied to the surfaces or embedded into the materials, aka 'composites'. The body do not have to be covered/embedded with absorbers. Strategically placed, absorbers will influence rule 2 and allows some flexibility in designing other features that will have no effects on final RCS.
Any more in-depth of these three rules will cross into the 'classified' information realm. But Rule One, control of
QUANTITY of radiators, is the first rule any 'stealth' design must consider. The greater the protrusion into the radar beam the less the degrees of control of rule 3 but the smaller the flight controls structure, the less maneuverable the design which leads back to the original design itself. The J-20's design require canards which made the J-20 less obedient to rule one. There is no way around this. Without the canards, it would not be a J-20 but something else completely. This is why internet Chinese are so sensitive about the J-20's canards and continues to mislead the public by dragging in experimental US designs.
For absolute proof, not merely evidence, of the validity of the three rules, the sphere is the radar calibration body because the sphere is the most obedient body to the three rules. The Lincoln Calibration Sphere is in orbit and serves as a test body for any surface radar.
en.wikipedia.org
