https://defence.pk/pdf/threads/swed...ler-and-stealth-is-totally-irrelevant.601018/
If Russia somehow cracks the code of detecting stealth-shaped fighters, the US's F-35, the most expensive weapons system in history, is cooked.
There is no such 'code' if Mr. Lockie is trying to imply, even figuratively, there is a single math equation or software if-else block that can solve the problem is getting a radar lock on a 'stealth' fighter.
This...
...Is how an aircraft look like to the radar computer: A cluster of voltage spikes.
Each spike is a collection of smaller spikes.
For example...
If there are surface irregularities, like a scratch or a rivet, each irregularity create a small voltage spike from the radar signal. The more irregularities, the greater the sum which ended up as a major spike for the radar computer. There is
NOTHING mysterious about this.
This is why maintenance for the F-117, F-22, F-35, and B-2 are intensive. They are intensive not because it is difficult to remove internal components, even a component as large as an engine, but intensive because we want to preserve surface consistency. The amount of panel fasteners are calculated in. The gap of the panels are calculated in. Each panel's dimensions are calculated in. Even material science regarding reflectivity are calculated in.
So just for surface alone, the factors involved are enormous to try to minimize radar reflections. Now calculate in other items like wings, fins, antenna, etc...etc...
The problem is data processing. One computer may see a single voltage spike. A better computer may see 10 discrete signals inside that single spike. A better computer may see 100 or 1000 or even more. So the real problem is how to detect these discrete signals and process them all.
An airliner is easy to detect because the designer do not care about these things. He does not care because the airliner is not a war machine.
At the high level, there is nothing mysterious about this. But at the practical level, to design in low radar reflectivity requires repeated shaping and measurement, over and over. A computer may help, but actual physical measurement is always required. So at the practical level, it is financially prohibitive for most countries, even one as wealthy as Sweden.
The Swedes can make all the claims they want. We chose our path and proved it lethal. Other countries can take their chances with the Swedes.