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Chapter 1773: Navigation technology

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    This Qin Baoshan really valued them too much.  Ask them to solve any technical problems.  The last time they were asked to make an aluminum oil radiator, it took them a lot of effort to make this thing.  Just came up with this thing, before taking a breath, Qin Baoshan asked them to do radio navigation again.  How could this thing be so simple, the basic principle of the two of them is still unclear, and now both of them are blinded.

    Just like that, they pondered all night, and both of them had dark circles under their eyes.  Fortunately, on the second day, Qin Baoshan brought Wei Dayong over.

    "Hey, what's the matter with you two?" Qin Baoshan asked the two of them: "It seems that you two are not in a good condition."

    Hearing Qin Baoshan's concern, Xiong Zheng and Lu Da had the urge to strangle him to death. We are not in a good state, and we were not forced by you.  You have to ask us to develop a radio navigation system, this thing is not so easy.

    Complaints are complaints, and they also know that this thing is very important.  After the pleasantries passed, Xiong Zheng said: "We only understand the basic principles of radio navigation. We can use radio direction finding, so that the plane can fly to the target, but the navigation accuracy of this method is too high.  Bad. There will be about two degrees of error in the heading. After the distance is long, the target is likely to be lost. That is to say, this method can take you to the Japanese mainland and find the little devil¡¯s big city to bomb, but I want to  It won't be easy to bring you back."

    In fact, the history of radio navigation began very early. In World War I, Germany dispatched Zeppelin airships to bomb London, using the original ground radio direction finding navigation.

    The two of them studied this thing all night. The basic principle is a loop receiving antenna. The larger the antenna, the better. During the propagation of radio waves, they will drift towards the receiving antenna. When the signal and the loop  When the plane is at 90 degrees, the induced currents on both sides just cancel each other out.  (In fact, there is no induced current at this time, only the induced electromotive force, which is just opposite, and the current cannot flow.) When the radio signal and the plane of the ring are at 0 degrees, the induced current is the largest.

    In this way, the direction of the radio can be determined according to the strength of the induced current by rotating the antenna.  This is the earliest wireless measurement technology used.

    In the early days, the antenna was manually rotated by the pilot, and the pilot listened to the sound, so that he could capture the strength of the radio and determine the direction of the target.  After the 1940s, there was an automatic rotating mechanism, which became a professional radio compass.

    This method has very low requirements on the ground transmitting station. As long as the frequency is appropriate, no matter it is a navigation station, a communication station or a radio broadcasting station, it can be used for direction finding. However, the accuracy of this device is limited by the size of the antenna ring.  , If you want to get a diameter of more than ten meters, then the accuracy is fine, but the plane is not that big, and it is already very bad to have a diameter of one meter at most. In that case, the error will be about two degrees.

    In this case, when you go, you should be more relaxed. After all, Japan is so big that you can bomb other places if you can¡¯t bomb Tokyo.  As long as they can drop bombs on the little devil's homeland, they will be satisfied.  If they knew that what Qin Baoshan planned to throw was not a bomb, it was a leaflet.  That's even easier.  But how to return?

    This is a pretty serious problem.  If the accuracy is not enough, I originally wanted to fly to the base of Licheng, but ended up flying to Taiyuan City.  The lights are blind, and the landmarks below cannot be seen.  When the time comes and how will they land?  This flight mission was carried out at night, and it flew over. When returning, there was a little delay, let alone the issue of fuel.  How do they land once it's daylight?  Wouldn't it be exposed?

    This problem is not easy to solve, the navigation accuracy must be improved.

    Hearing what the two said, Qin Baoshan smiled: "Of course, we must improve the accuracy of navigation, so we must set up a special navigation antenna here. This is what you need to study. The radio direction finding device  It is too simple, and of course it cannot be fully used. It must be done in a more precise way."

    "Director Qin, you know how to navigate radio?" Xiong Zheng couldn't believe it.

    "Quickly say it!" Lu Da said, Lu Da mainly researched materials, and he accompanied Xiong Zheng to do it out of a sense of responsibility. Now, he is very dissatisfied with Qin Baoshan's behavior of selling out.

    "If we want to get accurate direction determination, we need to work hard on ground transmitters, using accurate directional beacons. One transmitter tower is not enough, we can build two, and they emit phase complementary MorseFor example, these two codes can be the letter e (composed of dots) and the letter t (composed of bars), so that when the aircraft is flying to the left of the centerline of the beam, the pilot hears dots, and when it is on the right  What you hear is horizontal. When you are in the center, you can receive two signals at the same time, and what you hear is an equal-strength signal without interruption.  "

    What Qin Baoshan said is the most common lorenz system in radio navigation. It is simple and practical. When returning to the voyage, the pilot only needs to know whether the heading is left or right, so that he can adjust it and guide him all the way to the airport.  At that time, the runway lights will be turned on, and you can land calmly.

    When Qin Baoshan said this, the surprised eyes of both of them came out.

    "Of course, if we feel that this accuracy is not enough, we can also use a four-way beacon, which consists of two groups, that is, four antenna towers with similar signals. The faces of the two groups of antenna towers are at right angles. In this way, the aircraft  Flying in different positions, you can hear different sounds, which can meet higher navigation requirements, such as" Before Qin Baoshan finished speaking, he was interrupted by two people.

    On the one hand, because the principle is too complicated, it will take a certain amount of time for them to understand the principle now.  In this case, it is better to just give up!  On the other hand, it is also because their time is too tight. Even if they want to make this kind of more accurate radio navigation equipment, they still have time to experiment, so they only need to make the simplest one.  They don't want to make too much fuss.  Anyway, they don't need navigation signals in all directions, as long as they can point to the northeast and aim at the little devil's side, it is more than enough.

    Xiong Zheng's eyes were wide open, looking at Qin Baoshan, it was like seeing a monster.  Who would have thought that Qin Baoshan is so powerful, there is almost nothing he doesn't understand!  (Remember the site URL: www.hlnovel.com
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