In the mutual confrontation of fighters, interference with platinum strips is the most common means, the way of radar is to emit, and then receive electromagnetic waves, if the target is a diffuse reflection of the electromagnetic body, then, the reflected electromagnetic waves will be quite a lot, and, no matter what technical means are used, these echoes can not be eliminated, it is different from the clutter on the ground, after all, it is just a normal flying object in the sky.

Now, the other party released the platinum bar interference, leaving Brown's radar screen with snowflakes, but Brown was not worried, he was just cursing.

Why?

The platinum strip is not an airplane, it is launched from a special launcher on the fuselage of the fighter, after being released, it spreads out in the sky, and it can indeed hide the target in the clutter and cannot be identified, but this thing is not powered, so, after being released in the sky, it will slowly land down, and the target can only be hidden unless it lands with the platinum strip and wraps itself in a ball composed of platinum strips at all times, but the platinum strip will scatter.

So, it will definitely be found again, just for a few seconds.

Platinum strip jamming, generally speaking, is not used to deal with locking, but to deal with missiles flying over, when the missile is about to hit itself, while putting platinum strip jamming, while maneuvering to get rid of, take this opportunity, you can successfully get rid of the missile attack.

Now this kind of getting rid of the lock, there is no point, it seems that the other party really has no experience!

Brown adjusted the PDSTT mode back to the PDS mode again, the radar beams just now are converged together, the energy is large, and the target can be seen clearly, but at the same time, it will also give up scanning the surrounding airspace, if the target accelerates away, it may not be found, so it must be switched back.

The same radar, different users, may have different effects, because to deal with different targets, different modes are used, which is also the most important training requirement for radar officers.

If the radar officer's eye is good enough, he can even find the target from the snowflakes on the screen, track it manually, continue to lock the target, and then launch the missile.

If it is the pilots of the carrier-based aircraft wing, many of them can do it, but now, as a test pilot, Brown only needs to fiddle a few times in his usual tasks, and more often than not, he is a partner for Edwards, and he does not have that sharp eye.

Sure enough, a few seconds later, the snowflakes on the radar screen were gone, and Brown continued to look at his screen, but his eyes immediately widened.

Why are they all gone?

There should have been one target left, but where did the other party go?

"We've lost our target." Now, Brown said, he hopes that the snowflakes that fill the screen are that the MiG-21 fighter jet blew itself up.

The other party had a mechanical failure and blew itself up in the air.

Of course, this is just his wishful thinking, if the MiG-21 blew itself up, then the other party will definitely call and parachute.

Brown in the rear cabin was puzzled, and Edwards in front of him roared loudly: "This guy is too cunning, I have seen him, he is doing a serpentine maneuver!" Damn, hurry, PS mode! ”

How to be stealthy in front of airborne radar? The first option is a stealth aircraft, but now it is not possible, and the second, to take advantage of the weakness of the airborne radar.

If you want the fighter radar to achieve strong functions, it must be pulse Doppler radar, and the backward single pulse radar has long been obsolete.

In 1842, the Austrian physicist J?? C?? Doppler found that when the wave source and the observer are in relative motion, the frequency of the wave received by the observer is different from the frequency emitted by the wave source, a phenomenon known as the Doppler effect. When the source and the observer are close to each other, the received frequency increases; When the two leave each other, it decreases.

In this way, when the radar emits a fixed frequency pulse wave to scan the air, if it encounters an active target, there is a frequency difference between the frequency of the echo and the frequency of the transmitted wave, which is called the Doppler frequency. According to the Doppler frequency, the radial relative velocity of the target to the radar can be measured. Depending on the time difference between the transmitted pulse and the time of reception, the distance to the target can be measured. At the same time, the frequency filtering method is used to detect the Doppler frequency spectral line of the target, and the spectral line of the interference clutter is filtered out, so that the radar can distinguish the target signal from the strong clutter. Therefore, Doppler radar has a stronger anti-clutter jamming ability than ordinary radar, and can detect active targets hidden in the background.

Pulse Doppler radar is the only radar that can filter ground clutter, and at present, relying on advanced technology, the radar of American fighters has long been fully popularized.

However, this kind of radar also has shortcomings, it cannot detect or attack an enemy plane flying in the same direction and at the same speed as himself, and at the same time, it cannot attack a target perpendicular to his own aircraft, and at this time, the target is filtered out like a stationary target on the ground.

Now, this maneuver is still known to only a few people, or, how can a Chinese pilot, who has never been exposed to the concept of modern air combat, use this kind of maneuver?

When the fighter was locked by the radar, Qin Feng flew out while releasing platinum bar interference, because he knew that the other party had already discovered him, and he could only rush forward now!

However, how to rush up, that is exquisite, Qin Feng saw this tactic when he was studying foreign magazines, a serpentine turn!

When Qin Feng flew out, relying on the cover of platinum bar interference, he flew in a direction perpendicular to the other party's course. Since the radial velocity is zero, in the opponent's radar, it disappears.

In later generations, all pilots knew, but now, it is definitely known to a small number of elites, and after knowing it, it is not easy to use, because it is necessary to fly vertically just right, without the help of on-board equipment, completely relying on their own experience.

It's just that flying like this means that the distance is increasing, so you have to turn half a circle again, and the speed direction is still vertical, but it is already flying in reverse.

Depending on the distance of the target, this operation can be carried out many times, and flying back and forth like this repeatedly forms many S-shapes connected together, and it is like a zigzag snake, so it is also called a serpentine turn.

Qin Feng was flying like this, at this time, the two sides had already entered the visual range, Qin Feng was flying, and he quickly started his radar, he needed to use both hands and feet, compared to the beginning, he is now more proficient, locking the other party, there is only one chance!

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