"Damn, this broken system still can't achieve positioning, I had a hunch before I set off that it wouldn't be so smooth today, but I didn't expect the situation to be worse than I thought." Amid the muffled echo of four Rolls-Royce Merlin engines, Harry's angry voice roared as if it were about to overturn the roof of the cockpit.

"Don't do that, Harry, it's a common thing." Captain Robinson, the captain of the plane, comforted him, "It's good to have this system, and when we didn't have a system before, didn't we fly over and bomb it?" And you see, at least now our small team lineup is still very neat, and the formation is maintained quite well. ”

"How far have we flew?" Heavy Karak couldn't help but ask, "I feel like I've been out of the base for a long time. ”

"There's still almost 80 percent fuel, don't worry guys, if you can't find your target when the fuel level drops below 50 percent, I'll fly you back - trust my experience, as long as I fly across the channel, I can find a home without a positioning system." Robinson comforted everyone, "When the time comes, the bomb can be thrown wherever it goes, and anyway, it's either Germans or German-controlled territory down there." ”

Karak couldn't help but vomit: "The Germans have learned smartly, the implementation of light control in the past was very so-so, we can use the city lights to achieve general positioning, and now look at the black oppression, if you want to say that the Atlantic Ocean is below, I can believe it......."

Driver Paul sneered: "It's not learning to be smart, it's being blown up by us, they probably didn't expect it to be today when they dropped bombs over London, right?" ”

In the era of no GPS positioning and satellite navigation, Britain and Germany have put a lot of effort into achieving accurate positioning of aircraft, and have launched a variety of systems that use radio signals to navigate. Then the plane will appear on the other hyperbola at the same time, and the intersection of the two hyperbolas is naturally the current position of the aircraft. In the process of use, the aircraft navigator can use the pulse signal of 20-85MHz to achieve distance determination, and use a specially made map printed with a color hyperbolic network to find the intersection point and achieve successful positioning according to the received results. The advantage of the system is that it can achieve simultaneous positioning, that is, it can guide multiple aircraft, and it is very convenient to fly in large formations, and the disadvantage is that there is an error due to the curvature of the earth, the farther away from the navigation station, the greater the error, and the positioning accuracy outside 350 kilometers decreases very quickly, and can only be located in a place within the range of 10 square kilometers.

The reason for the loss of the voyage was not that the British had a bad system or principle, but that the navigation stations they used were all on the British island, and the location they were going to was all in the heart of the European continent, and they had to fly so far to the Ruhr industrial area, of course, problems were inevitable.

Due to the heavy losses of the Royal Air Force crew in the summer air raids, many newcomers were formed into the crew after hastily training, Robinson was the pilot of the other crews, and was promoted to captain because he had successfully carried out more than ten air raid missions, and Harry was selected to be the leader of this small team after only three or four successful missions. The staffing of this aircraft is quite ideal, otherwise it would not have been selected as the commander of the formation, because the other wingmen did not even have qualified navigators, and they were purely flying closely with the long plane. Harry only knew that the higher the flight altitude, the higher the accuracy of the system, so he asked the captain to raise the flight altitude to the Lancaster ceiling, but completely forgot that the Gee system only had a range of about 550-650 kilometers, which could cover the Ruhr area but not Berlin. Now it is clear that it is not the system that has a problem, but that they have left the maximum scope of the system, but no one understands this truth, and no one can teach him now.

"Attention of all units, the enemy aircraft 4 large aircraft in a close formation has entered the Greater Berlin air defense circle, the current altitude is about 5500 meters, the speed is 400 km / h, and the course is 110 degrees......" The horn sound in the command hall sounded, and everyone's attention was raised a level, and they cast their eyes on the huge aviation map, only to see that 4 tight red light points had appeared on it, and some blue light points were scattered in the distance, according to the dispatch of the command hall, Soon, 8 blue dots of light began to outflank the red dots.

"This is supposed to be an aircraft of the NJG1 wing." Pointing to the map, Kamhuber explained, "The other planes are not moving for the time being, dealing with possible contingencies. ”

"Does our radar always work? Could it be a false target or false interference? ”

"It's not." "If there had been interference, there would have been a snowflake on the radar screen, and no one has reported this now, so it shows that the British are not jamming." ”

Jeshunek added: "When bombing in large formations, the British usually interfere with us, and at first we were tossed and helpless, but then we got used to it, and these millions of signals in turn were directing the British flight path - after all, interference does not come out of thin air, there must be planes thrown in the air, and where there is interference, there are British." ”

Through the explanation, Hoffman understood that electronic jamming is still very rudimentary, and at most it is to throw aluminum foil or use radio waves of the same frequency to interfere with the enemy, similar to creating false targets, blocking communications, and other means are far from appearing.

"Very well, you can take full command, you don't need to ask for my opinion." Although Hoffman was also the commander-in-chief of the Air Force, he did not understand air defense operations at all, so he consciously did not interfere, and only quietly watched the light spots flicker and approach each other.

Harry...... It's not a way to fly like this, or let's lower the altitude and go down and see? You may be able to see some references from the ground. After flying for more than ten minutes, Robinson couldn't help but see that Harry still couldn't use the system to achieve positioning.

"It's fine." Harry put down his device, closed the hyperbolic positioning map in his hand, and shouted through the microphone, "Attention formation members, the descent below is about to reach 12,000 feet (about 3,600 meters), please follow close." ”

"Roger!"

"Roger!" The massive Lancaster swung its ailerons and began to swoop downward.

"The enemy aircraft began to reduce the altitude ......" the pilot received a call from the forward warning radar station and immediately began to report, "the direction remains the same, the speed increases to 420 km / h, altitude: 5000 m...... 4800 m ...... 3600 meters. ”

As the guide reported the figures, the markings on the light spots began to be adjusted in an orderly manner, while the staff officers on the other side used rulers and compasses to map the tracks on the ground drawings and made nervous predictions about the subsequent routes of the enemy planes -- in the era when there was no computer to process data, the level of manual mapping could often tell the quality of the staff officers.

"This height is not the height of bombing, what do the British want to do?" Kamhuber muttered, in peacetime the command center is under the full command of Colonel William, and today since the Führer personally came to inspect, he took over the command without hesitation, the problem is that he is not familiar with the details, so he had to turn his head and ask the colonel, "How long will it be for enemy planes to enter the air defense position?" ”

"Position No. 7 will be ...... enemy in 5 minutes" Colonel William consciously turned into a staff officer and informed Hoffman and others of the information in real time. Being taken over the command by General Kamhuber is nothing, it is worth everything to show his face in front of the Führer, not to mention that today the Führer is followed by Marshal Keitel, Minister Speer and other rare bigwigs, his heart has long been beating "thump", and he has prayed more than once that the air defense forces will be a little more courageous.

"The enemy aircraft has an altitude of 3,600 meters, a speed of 380 km / h, a course of 117 degrees, and the No. 7 position has been prepared......" Hearing this, Camhubel waved his hand heroically, regardless of the fact that the commander on the anti-aircraft gun position could not see such a windy action at all, and directly ordered "Open fire!" ”