The earth is a sphere, this is not nonsense, because it is a sphere, therefore, the radar on the ground cannot detect ultra-low-altitude targets, because as long as the opponent flies dozens of kilometers away from the base, it will be below the horizon, and now, a common means of aircraft attack is still ultra-low-altitude penetration, which is to use this basic principle of physics.

However, with the development of radar technology, early warning aircraft appeared, and when the radar was put into the sky, ultra-low-altitude penetration failed.

Now, Qin Feng's take-off this time has no highlights, it is quite boring, and after he took off, the Tomcat fighter did not take off immediately, if it takes off now, it is still no different from the Tomcat taking off first, simply, let Qin Feng's MiG-21MF fly for a few more minutes, let him fly to the predetermined airspace first, familiarize himself, and it will not be too late for him to take off.

Therefore, when five minutes had passed, Edwards slid the Tomcat fighter onto the runway, and the Tomcat spread its wings, and in the envious eyes of everyone, the gliding distance was only half that of the MiG-21, and it had already left the runway and spread its wings.

This is the second time everyone has seen the take-off of this kind of fighter, and the same as the first time, I am still quite surprised, this aircraft is too imposing!

For the test pilots of Grumman, they did not think that this was a confrontation, and their fighter planes were only filled with two tons of fuel, which was the amount of normal test flights, and the so-called confrontation was just a small episode in the test flight.

Let's get rid of this little episode first.

As the Tomcat was climbing, Edwards said to Brown, the radar officer behind him, "Turn on the radar, PDS mode." ”

In some countries, the radar officer is the vassal of the pilot, and even they think that the radar officer is not a normal pilot at all, and the status is very low.

In the United States, of course, this is not the case, they advocate equality, radar officers usually live with pilots, live together, and are completely good partners and good friends, but when fighting, radar officers still have to listen to the pilot's orders.

In long-range and medium-range combat, he is responsible for operating radars, locking onto targets, launching missile attacks, and in close-range combat, he acts as an additional eye for the pilot, providing more visual information.

Following Edwards' command, Brown easily turned on the radar and adjusted to the pulse-Doppler mode.

At this time, as soon as he flew up, Brown calmly said to the radar officer behind him.

Now, pulse Doppler radar for the Chinese Air Force, is still a mystery, they don't know the principle of this radar at all, and they don't know its various modes, domestic radar, the mode is very single, although they have been exposed to the radar of the Phantom 2000, but they only know the skin, and the radar of the Phantom 2000 is not a pulse Doppler in the real sense.

When it comes to radar, everyone will think that the radar of the MiG-25 burns the rabbit is very powerful, in fact, the strength of the AWG-9 is more efficient and perverted.

It can detect targets more than 300 kilometers away, which is simply a target that makes other peers look up and despair.

In fact, when it comes to this detection range, it is necessary to first talk about its mode, and talk about the detection distance out of the working mode, that is, to play hooligan, AWG-9 has a variety of working modes, and the current PDS mode is translated as pulse Doppler search. This is a search mode that works in pulse mode while using the Doppler effect, and is also the most commonly used mode for Tomcat fighters.

Since it's a search, it's just a matter of seeing the target, showing a bright spot on the screen, marking a location information, and nothing else.

Therefore, it is not able to guide missiles, however, the detection range of this mode is quite long, and the powerful search range of 300 kilometers is in this mode.

Even in the face of the MiG-21, it can detect more than 200 kilometers or so, and this is the distance they want, they can take off now and fly to the confrontation airspace, so they can turn on the radar and keep looking at whether there are any targets in the airspace 65 degrees in front of them.

In Edwards' eyes, finding the target is a matter of minutes, and once discovered, it immediately switches to PDSTT mode, locks the other party, and ends this ridiculous confrontation.

The Tomcat spread its wings and flew smoothly at an altitude of eight thousand meters, while Brown in the rear cabin stared at the radar screen in front of him.

In front of him there are two screens, this large 25.4 cm diameter cathode ray tube tactical information display, which is used to display target information.

A bright line turned around the screen, and then again, and the fighter plane was constantly flying forward level, but nothing was found on the screen.

"No target found." Brown looked at the screen carefully, and as a radar officer, he also had to have a pair of sharp eyes, even if it was a faint tiny bright spot on the screen, he had to be able to see it.

No is nothing.

Didn't find a target?

Edwards felt a little funny, isn't the target in this airspace, this is the prescribed exercise area, could it be that he is not familiar with the airspace here, lost, right?

Despite this, Edwards pushed the lever and kicked the rudder, and the fighter made a side turn.

This is also dictated by the rationale.

Pulse Doppler mode, through the Doppler effect, will filter out those fixed targets, in this way, ultra-low-altitude flying targets, will also be filtered out from the ground, however, there is a flaw, if the target and themselves are flying vertically, the track angle between the two is 90 degrees, in this way, the other party's radial velocity relative to itself is zero, in this case, the radar will think that the target is a fixed target on the ground, automatically as a clutter to filter out.

Of course, it's very easy to deal with, as long as you change your course slightly, so that the angle is not 90 degrees, and that's fine.

"Target found!" At this moment, Brown suddenly saw a strong spot of light on the radar screen, and immediately became happy.

However, just a moment of joy, he saw a highlight next to it, it was a Boeing 707 airliner!

On the civil airliner, it is equipped with an automatic transponder for civil aviation, and when it is scanned here, it has already identified itself.

There was already a civil aviation route here, so it was not uncommon for civil airliners to appear.

"It's a Boeing 707." Brown said disappointedly.

Didn't find the target, the target seemed to have disappeared, the sky was empty, there was only a passenger plane, could it be that he was at an ultra-low altitude? That's impossible.

"Report, the target is not in the airspace of the confrontation drill, request to end the confrontation." Edwards shouted helplessly over the radio.