Chapter 821 Shooting Down the F-117 (I)

The night sky is extremely dark. For the nighthawk, the night is its stage. It is like a ghost in the midnight, silent and motionless.

After taking off from the Sao Paulo base, it headed south. When it was about to leave Brazilian airspace, it reunited with an aerial refueling aircraft and completed the refueling operation. A group of twenty Nighthawks passed through the Uruguayan airspace and headed straight for Buenos Aires!

Before entering Uruguayan airspace, Whitley looked to both sides for the last time to make sure that all the navigation lights that were turned on during refueling were turned off. At the same time, he also helped nearby aircraft to confirm. This was a habit developed through repeated training. If the navigation lights were still on after entering the battlefield, they would be shot down by the enemy's anti-aircraft guns!

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The Nighthawk is able to remain stealth in the air thanks to its unique fuselage design. Its own maneuverability is quite poor. If its navigation lights are on and it is targeted visually, it will die at the hands of ground-based anti-aircraft guns.

It would be extremely unfair then.

Continue to fly south! Along the way, radar beams continue to shine on the plane. Since Uruguay is a small country, Argentina's long-range radar can also shine on this side. However, no radar beam has switched from scanning to locking state, which means that the Argentines cannot detect us at all!

The Nighthawk continued to fly in the sky, and after crossing the airspace of Uruguay, Buenos Aires was right across the sky!

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Getting closer and closer to the Argentine capital, the precise navigation equipment on board was working continuously. In Fray Bentos, they confirmed the navigation coordinates for the last time and prepared to enter the route before the bombing. Only a dim light blue light came out of the cockpit. The radio remained silent. Everyone was driving their own planes steadily. No matter how many anti-aircraft missiles and anti-aircraft guns there were, they could not do anything to them!

Buenos Aires, the capital of Argentina, is located on the HN coast of La Plata and the southeast coast of South America, with Uruguay on the opposite coast. Such a capital actually has no deep defense and can be directly bombed from the sea or from the north!

If it were an inland country, with countless anti-aircraft guns deployed along the way, it would also be a threat to them. But now, bombing Buenos Aires is just a task as easy as training!

Of course, they didn't know that at this moment, in the north and south of Buenos Aires, on the chassis of two field trucks twenty kilometers apart, meter-wave radar antennas were erected and constantly scanning them.

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This meter-wave radar is very similar to the later Russian Vostok-E meter-wave active phased array radar. The radar antenna is erected high on a huge hydraulic support pole at the rear of the off-road truck. At the same time, the antenna is in the shape of a long strip and huge in size.

This is the magic weapon to fight against stealth aircraft invented by the Soviet air defense department after several years of hard work!

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All this is thanks to General Andrei, because Andrei predicted in advance the huge advantages of stealth aircraft, and Andrei also pointed out the direction that using meter-wave radar to fight against stealth aircraft is the most appropriate choice. Therefore, Soviet scientific and technological personnel continued to study and finally invented the current meter-wave phased array radar!

Meter-wave radar was very popular during World War II and was used to detect enemy aircraft invasions. However, after World War II, meter-wave radar was gradually eliminated because of its huge size!

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Meter-wave radar refers to the radar waves emitted by the radar being on the order of meters. The radar antenna needs to radiate the full wavelength, so the size of the radar antenna must exceed the wavelength. To meet various requirements such as gain, the size needs to be even larger, which results in radar antennas being several meters or even more than ten meters in length. For example, the current radar antenna is more than ten meters long! Such radar antennas are very inconvenient to deploy and operate.

At the same time, another defect of meter-wave radar is its poor accuracy. Generally speaking, the error is in the order of meters! For example, the meter-wave radar in the 1950s had an error of several hundred meters or even kilometers! In this way, it can only detect the target, but cannot determine the exact position of the target at all, and at the same time, it cannot guide the missile!

Therefore, with the advancement of technology, the wavelength of radar is rapidly shortening, and centimeter wave, millimeter wave, and even microwave radar are becoming popular.

However, it is necessary to take out the meter-wave radar now, because the meter-wave radar happens to be the nemesis of stealth aircraft!

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Each reflective surface of a stealth aircraft has a slope, which just reflects the radar waves to other places. At the same time, stealth aircraft also have radar-absorbing coatings. However, these are all for short-wavelength radars. Meter-wave radars are naturally capable of detecting stealth aircraft!

However, another defect of meter-wave radar seems to be insurmountable. It can only detect stealth aircraft, but cannot accurately determine the direction from which the stealth aircraft is flying, let alone guide missiles.

A common method for missiles is passive radar seeker, which is also called semi-active radar guidance. However, installing a radar antenna with a diameter of more than one meter in the warhead of a missile is simply unimaginable!

Therefore, another solution was needed! And the idea proposed by Andre was networking!

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One meter-wave radar is not enough to guarantee sufficient accuracy, but two meter-wave radars, separated by a certain distance, can be networked and the signals detected by the two radars can be combined to greatly increase accuracy!

This is like GPS. The United States has two levels: military and civilian. The civilian level has low accuracy. So, someone came up with a better way, which is differential GPS. By using base stations to calibrate in advance, the navigation error is corrected, which greatly improves the accuracy. This is the result of the networking principle. The positioning accuracy of ordinary civilian GPS is 25 meters, but with this principle, the rough position differential can reach the meter level, and the most accurate carrier phase differential can improve the accuracy to the centimeter level!

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Now, this specially improved meter-wave radar has a single detection accuracy of 300 meters. By accurately measuring the radar coordinates and comparing the data of the two radars, differential calibration can be performed. This way, the detection accuracy can be improved by at least 100 times to the order of meters!

Although the meter-wave radar cannot guide missiles with semi-active or active radar seekers, the command guidance method is sufficient!

Between these two radars, which is ten kilometers away, in the center of the city, there are three SAM-3 air defense missile positions deployed in a trapezoidal arrangement, guarding the north of the Argentine capital. This is also the direction where the American stealth fighters are most likely to appear!