A surface-to-air missile used to be a decision, not a missile. Once a battery declared you, a round arrived and you died, and flares didn't change it because defeating a missile was a random roll at 12–15% per cartridge.
That's gone. Every defence is now something you do, and the same inputs always give the same answer. Here are the four layers, in the order you meet them.
1. Stealth: whether you are seen at all
Every airframe has a real radar cross-section. Detection range scales with the fourth root of RCS, because received power falls off as 1/R⁴. That's the radar range equation, not a game curve.
| aircraft | RCS | seen by a 250 km HQ-9 at |
|---|---|---|
| F-22 | 0.0001 m² | 17 km |
| Su-57 | 0.3 m² | 124 km |
| Gripen | 0.5 m² | 141 km |
| F-16 | 1.2 m² | 175 km |
| JF-17 | 1.6 m² | 188 km |
| Su-27 | 10 m² | 297 km |
Four orders of magnitude of shaping buy one order of magnitude of range. The F-22 isn't invisible. It's engaged from inside 17 km instead of 188, which is the difference between fighting on your terms and being shot at from beyond your own reach.
2. The notch: geometry that breaks a radar seeker
A pulse-Doppler seeker ignores returns whose Doppler shift matches the ground behind them. Turn until the missile is on your wingtip and your closing speed drops below 30 m/s. You now look like the ground, and the lock breaks.
- It applies to the missile, not the battery. Beaming the launcher isn't beaming the round.
- You need at least 80 m/s. A notch is a manoeuvre, not flying slowly.
- It does nothing against an infrared round, and the HUD tells you so.
The HUD draws a bar that you fly to zero, so the manoeuvre is something you can see while you fly it.
3. Energy: make it turn, and it dies
Missiles pay induced drag. A round pulling its full commanded g has about five times the drag of one flying straight. Every hard break costs it energy it can't recover. Once its motor burns out, a round that has fallen below your speed and stopped closing gives up.
Break late and break hard.
4. Countermeasures: a comparison you win
Chaff makes a huge radar return that stops dead in the air the moment it blooms, so a Doppler seeker filters it out. Dumping chaff while running away does nothing. In the notch, though, the seeker can't tell you from the cloud and takes the cloud. You don't just fire chaff. You manoeuvre into position for it to work.
Flares are compared against the heat from your own tailpipes, which makes the throttle a defensive control. A cartridge that decoys a seeker at idle fails in full afterburner. An AIM-9X is harder to decoy than an AIM-9M every time, not four times in nine.
Put together
Fly low and use the terrain, because a site checks line of sight against the ground on every sweep, and a ridge ends the engagement. Pick your airframe with its RCS in mind. Beam the round when the launch warning comes. Punch chaff in the beam. Break late and hard so the missile burns whatever energy it has left.
Do all of that and you live. Do none of it and you're a radar return closing at 250 m/s, and you die, which is the same answer the real thing gives.
And before any of it: set your transponder. Mode 4, code of the day. The ring around your own capital is the first thing that kills a pilot who forgets.