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Original debut over the North Atlantic]

A large, strange-looking plane is sailing north of the English peninsula. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ≦≧

Aside from the four engines at the base of the wing, the aircraft no longer bears any resemblance to its original mother, the "Comestar" 4C airliner.

After World War II, Britain took the lead in developing civilian jetliners and developed the comet airliner. In 1952, when the comet was put into operation and became the world's first commercial jetliner on scheduled flights, it was relatively technically and commercially successful, at a time when the Boeing 707 on the other side of the ocean had not yet begun test flights.

As a mature passenger aircraft, the fuselage has also begun to be modified, the first to be modified, is the Hunter anti-submarine aircraft, mainly in the rear of the tail of the long tail boom installed a magnetic anomaly detector, the nose is equipped with a search radar, the vertical tail is equipped with an antenna of the electronic support system. The newly designed non-pressurized belly weapons compartment and system compartment became a noticeable difference from the Comet airliner, the fuselage section was no longer circular, but a pronounced double-bubble type, and a search radar was installed in the nose of the cabin, which was larger than the nose of the airliner. In addition, the vertical tail area, cockpit windshield, and windows have been enlarged.

Moreover, compared to the airliner, the "Hunt" uses Rolls? Reuss' "Spey" engine has reduced fuel consumption, increased range, and, when the load is lighter, it can also be used to turn off the two engines and leave only two engines to work to increase the endurance. ≦≧

The improvement of the Hunt is very successful, and the current plane, compared to the Hunt, is much uglier, in the nose and tail, each bulging out a spiky bag, which is Marconi? Elliott Avionics Systems' new pre-jing radar, this strange-looking aircraft, is the fan-hunting pre-jing machine that British Space is experimenting!

As the first country to develop radar, the United Kingdom naturally took the lead in air pre-jing, and successively had several airborne pre-jing projects. For example, the old "Gannet" and "Shackleton" maritime patrol planes, the E-3 pre-jing aircraft in the United States have entered the era of active service, and the British have found that if they do not catch up, they will be left far behind.

However, the British are no longer an empire that does not fall, after World War II. Britain has suffered a lot of damage. Moreover, the discontinuation of the TSR-2 project has caused a serious loss of technical personnel in the UK. The British sadly found that their technical strength could not reach the way they carried a big plate on their backs, as in the United States.

Thereupon. The British came up with the idea of using two radars, arranged in front and rear of the aircraft, to provide a 360-degree scan to realize their own pre-aircraft project. ≦≧

However, the military didn't care about this, and the technical indicators put forward made the researchers go crazy.

It can not only effectively detect sea targets, but also track low-altitude targets on land at a long distance, while maintaining 400 tracking trajectories, Xing can be more advanced than the E-3!

"Attention. The radar is turned on and is ready to enter the predetermined airspace for testing. In the pressurized cabin in the middle of the pre-jing, said the project leader, John of British Aerospace.

Although this large passenger plane is very spacious when it comes to arranging passengers, it is now arranged with a large amount of equipment after adding a lot of equipment. Even the arrangement of the radar cāo station was tense, and five large monitors were displaying data along the side of the necessary aisles, plus two air combat commanders and two equipment maintenance personnel. It's already packed.

And in the back, in a small space, there are not even enough beds to accommodate the shift changer. It can only be the same as the navy, sleeping in a three-story hot bunk.

And now, the pressurized cabin is filled with engineers from the pre-jing project. ≦≧ (Actually, there is a certain danger in this kind of experiment, Ah San once developed his own pre-jing machine, but it crashed, resulting in the death of all the electronic experts above, and the pre-jing machine project was terminated)

With John's words, several cāo personnel began to flip the switches on the console in order, a row of indicator lights lit up in turn, and the waveguide and other components of the radar were charged and warmed up. The 4080m computer was turned on, ready to do its best to calculate the data that was pouring in like cháo.

Finally, an engineer on the main console pushed the cāo pole up.

Suddenly, the two large S-band pulse Doppler radars in the radome at the bow and tail of the pre-jing machine began to send out powerful electronic signals, and the gimbal at the bottom of the radar began to rotate, and the radar officially worked!

Radio waves, passing through the radome, shè to the surrounding airspace.

At the same time, the screen on the cāo console began to show points of light, which were several targets in the air and ships on the sea.

"The radar is working fine."

"Data tracking is normal. ≦≧”

"The computer is working fine."

One report after another popped out of the mouth of the engineer who was made by Cāo, and John knew that the current normality was only temporary.

"Keep tracking."

The plane headed east and continued to fly over England.

Entering the sky over the land, all of a sudden, there were more targets on the radar screen, and the pre-jing machine scanned the sea surface, and was rarely affected by clutter, but when it came to the ground sky, the clutter suddenly increased.

gebsp; The 4080m electronic computer feels that the data that needs to be processed has increased significantly, and the pulse Doppler radar uses the different radial velocities of the target and the jammer relative to the radar, and the echo signal also has different Doppler frequencies. The Doppler frequency spectral line of the target can be selected by the method of frequency domain filtering, and the spectral line of the interference clutter can be filtered out, so that the radar can separate and detect the target signal from the strong clutter.

The larger the area of radar detection and the more complex the terrain on the ground, the more echo signals will need to be processed. ≦≧ particularly, even the signals of many fast-moving cars on the ground were not filtered out, and the data began to increase alarmingly.

The British side proposed to establish 400 stable tracking trajectories, but such a computer only has 1 m of memory, and even if it is expanded, it will only add another 1.4 m externally.

gebsp; The 4080m electronic computer began work at full capacity.

"There's a huge increase in the amount of data."

"Two hundred tracks have been tracked."

"The computer is already working at full speed."

"The data is overloaded, and twenty tracks that have been established have been lost."

"The system has started to overheat..."

Hearing the latter, John's face showed disappointment, and the nightmare began again, and although the measures were improved, the problems were not ruled out.

The platform for hunting fans is at most ninety tons, and after so many electronic devices are crammed in, how to deal with the problem of heat dissipation is very difficult for engineers to scratch their heads.

At present, fuel is often used for heat dissipation, which circulates in the body, which is equivalent to the refrigerant of the air conditioner, absorbing the heat released when the mission electronic system and radar are working at full load, and bringing it to the outside of the body to be lost. To ensure that it can fully function, the onboard fuel tank must be kept at least 50% full, but as the flight progresses, the fuel in the aircraft will gradually be consumed, and now the electronic system is working at full speed, the problem of heat dissipation has become more serious.

(This heat dissipation method is the most common, such as the Concorde supersonic airliner, due to the high speed, the temperature caused by friction with the air will also be higher, that is, the fuel is circulated to take away the heat.) The modern F-35B also faces similar thermal management difficulties, due to the increase in the weight of the aircraft, the fuel reserve during vertical landing is forced to decrease, resulting in not enough oil in the fuel system to absorb the waste heat released by the electronic system, and if the ambient temperature is high, the aircraft's electronic system will not work properly. ）

John shook his head and began to repeat the process again, in fact, if the technology required by the Air Force is not so strict, as long as the computer does not process so much data, for example, for targets that are too low, all of them are filtered out as clutter, then the electronic system will not process so much data, and it will not overload, causing a rapid increase in heat.

However, this is impossible, and the Air Force wants the Star of the Hunt to surpass the E-3, which is too much to overestimate its own research and development capabilities.

And now, the Ministry of Defense has no extra funds to continue to maintain the research and development of this project, John has heard a lot of news, at the top level, the call to cut this project is getting louder and louder, and the risk of buying a ready-made pre-jing machine from the United States is very small.

John has been working on this project for several years, and he really doesn't want it to die, but the current situation seems to be very unoptimistic.

"The computer is about to crash." An engineer said.

Due to the limitation of computing power, the computer is unable to maintain the established tracking trajectory, that is, the target is lost, and then the target that has been successfully tracked will be re-tracked as a new target, further increasing the pressure on the computer's computing power, causing a vicious cycle, and now, the computer system is about to fall into a state of collapse.

This time, however, the computer did not crash, because, then, all of a sudden, the radar signal disappeared.

All the light spots on the screen are gone, the data that the computer needs to process is missing, and it has returned to its original state.

"The traveling wave tube is burning." Although the rear cabinet compartment was a non-pressurized cabin, the altitude had now dropped to less than three thousand meters, and the engineer went to the cabinet compartment to check it out, and came back to John.

The traveling wave tube is the most important electronic component of the radar that generates electronic signals, and if this thing is broken, it can only be replaced on the ground, and due to design problems, it will take at least five hours to replace this element.

"Let's get back to base." John said that this experiment ended in failure again, and the hunting machine always failed to work stably!

The mood of all the engineers in the cabin was very low, if it weren't for the unrealistic indicators to be completed, their pre-jing machine would probably have entered active service by now! To be continued