Chapter 80 Echo Detectors Radio Navigation

When Zhang Zhimu returned to the office, Lu Bingyi was waiting for him here.

Seeing Lu Bingyi's dark and thin face, Zhang Zhimu said a little unbearable: "Mr. Lu has been out for so long this time, you are tired!" ”

"Yes! I'm a little tired, but I'm in good spirits. I saw a lot of places this time, and I gained a lot. Lu Bingyi said.

"Mr. Lu, you must not be like your disciples, you are not forgiving at your age!" Zhang Zhimu said, "Uncle Chen and Mr. Ouyang and I are very worried about you, and every time we meet, they ask you about it. ”

"Originally, I was going to see how the Lingqu was going this time, and see if there was a better way to cross the boat on the Lingqu side. But when you go out, you can't help yourself. Ouyang He said with some excitement, "This time I first went to Chencang (Baoji), then to our first-class reservoir construction site, after Qinling and then to Hanzhong, and then to the construction site on the other side of the Jialing River." Later, I took a boat to the Ling Canal, where I made an inspection and actual measurements, and there I worked out a plan for a new river channel. When I came back, the director of the Zhenjiang base sent a telegram to Lingqu and asked me to go to Yingtianfu (Nanjing) to have a look, and they wanted to restore the original dock for building big treasure ships in Nanjing. I went to Yingtianfu (Nanjing) to see the dock, and then to our Zhenjiang base to have a look. When I came back, I walked around the canal construction site from Kaifeng to Huai'an. He studied with Mr. Tang Jingyao, the engineering situation of the Huai River estuary, and studied the sand control of the canal from Kaifeng to Huai'an. When he arrived in Wuzhi, he investigated and measured the water surface of the Qinshui estuary and the Qinghe (Weihe), and formulated a plan to communicate the Qinghe (Weihe) and the Yellow River. I finally rushed back, although I came back a little late, but it was worth it. My disciples also said that it was really worth walking around like this. ”

"Oops! It's worth it. Zhang Zhimu said, "By the way, I didn't go home for a few more days when I passed through Yangzhou this time?" ”

"Nope. First, I don't have time, and my family is now in Yaogang. There was no one left at home. Lu Bingyi said, "At the beginning, they were reluctant to come to Yaogang, but now they are not leaving." Hehe! ”

"Mr. Lu, you may need to take some time to talk to us about the matter in this circle. However, I would recommend that you go home and rest for a few days. Zhang Zhimu said very considerately.

"Yes! As soon as I go back to rest, I also have to organize my thoughts. Then I'll share my thoughts with you. Lu Bingyi said.

"Actually, we have been waiting for you to come back and want to discuss with you the long-term plans for our railways and bridges in the future. This time, I think we'll look at the whole matter of land and water transportation together! Zhang Zhimu said.

Shi Tao rushed to Zhang Zhimu's office with a few people before getting off work in the evening, and Zhang Zhimu arranged to invite Shi Tao and Yang Chang to have a meal together in the evening, and by the way, let Yang Chang introduce the situation to Shi Tao and them.

Hearing that Zhang Zhimu couldn't go home for dinner at night, Yang Yulin was very unhappy, "Can't you let them eat by themselves?" If you don't go to dinner, your home won't be lively. The kids weren't happy! ”

"You go back and tell the children, there's no way today, I'm eating out and working."

Zhang Zhimu knew that the family liked to go back to eat by themselves, because they were busy during the day, and only when they ate at night, the family could gather to talk. Zhang Zhimu also tried his best to go home for dinner at night. But today Zhang Zhimu really wanted to have a good talk with Shi Tao and them, especially Yang Chang and them. Everyone can relax together to have a meal and drink, and you can also communicate with each other. Sometimes this kind of communication can collide with sparks.

Shi Tao brought three people over today, and Yang Chang also brought the two leaders of the echo detector team over.

Shi Tao and Yang Chang were already very familiar, and as soon as they came to the restaurant and sat down, Shi Tao didn't care about greetings, so he asked, "Mr. Yang!" How far can your echo detectors detect? ”

"The limit value has not been tested, but the current detector should have no problem probing a few hundred meters." Yang Chang replied, "But if necessary, increase the sensitivity, increase the transmission power, and the detection can be done even farther away." Distance shouldn't be a big deal. ”

"Great," Shi Tao exclaimed, and then asked, "Can this kind of detector arbitrarily specify the detection direction?" ”

"Of course, as long as it's in the water!" Yang Chang replied.

Hearing Yang Chang's answer, Shi Tao turned his head to Zhang Zhimu and said, "Mr. Zhang, with such a detector, our navigation will be much safer." We can put a detector on the bow of the ship, so that if there is a shoal reef ahead, you can know it. We can also install a detector under the bottom of a survey boat to detect the depth of the water, so that I can mark the depth of the water everywhere on the chart. In that case, it will be more convenient for us to sail. ”

Yang Chang also said: "When we developed this echo detector. Also considering the ease of use on the ship, we emit a pulse to count at the same time, when an echo is detected, calculate the counting result, and then display the time and distance with a digital tube at the same time. The people on board can be seen at a glance. ”

"Good! That's great! Shi Tao and the three people he brought kept saying yes.

Zhang Zhimu said to Yang Chang: "Your number can only display the distance parameter in one direction. Can it be so, the sending and receiving probe of this detector can be forward, within a certain range, constantly changing the angle back and forth, constantly detecting the distance parameters, and then displaying the data on a display, so that the distance parameters and even the shape of the distance in a sector area in front of the bow can be displayed intuitively through graphics. If there is also a downward detector, it can also be displayed with a display. This allows the ship to constantly see what is being detected in front of the scanned back. Also, if the target is too close in front, you can also activate the alarm to remind everyone to pay attention. ”

After listening to Zhang Zhimu's suggestion, Yang Chang and the two probes glanced at each other, and then said, "Mr. Zhang's idea should not be too big a problem technically." Our detector team and the monitor team should be able to do it together. ”

"Oops! It would be great if you could make this thing. You must find out about it. Shi Tao said, "There is basically no major thing in our country." Our navy is about to go to the sea to show its hands and feet, and the sea is not the same as our river, where the scope is large, and there are too many unknown situations. If we had the means to do that, it would be a great addition to us. ”

"Don't worry, we brothers have nothing ambiguity in doing things, and we can do it if we can do it." Yang Chang said, "In fact, there is another good thing, and I estimate that it will be successful soon." It's a radio detector. Just now we used hydroacoustic detectors, and I'm talking about radio detection distance in the air. With this on board, distant mountains and ships can be radioed to pinpoint the exact distance. It's much more accurate than optical ranging, and it's not affected by rain and fog. Especially if there is a lot of fog at sea, you can't see each other. Then the side with the radio detector can have a great advantage. They can precisely guide artillery for accurate fire with radio detectors. ”

"Oh my God! I can't believe it! If we have this thing, we will not be afraid of going anywhere, day or night. If there is a target approaching the underwater surface, you can find it, so what is there to worry about?" Shi Tao, an old sailor, knows too well the importance of the two things that Yang Chang and the others are engaged in.

Zhang Zhimu interjected again: "The radio detector should also be connected to the monitor." It is also necessary to combine the direction of the compass to show the situation in each direction. With radio detectors, you can measure how far away you are from the coast. It can be detected wherever the radius of curvature of the earth is not affected. However, in order to detect higher resolution, the higher the directivity of the electromagnetic waves you emit, the better. This requires you to transmit at a higher frequency and have better antenna directivity. ”

Shi Tao suddenly asked: "Mr. Zhang, we have this technology, since the detection accuracy of the radio measuring instrument is higher, can we make a radio artillery sight?" ”

"Hmmm! Shi Tao's suggestion was very good, so he asked the original person who was engaged in optical sights to send people to participate in the radio sight and work together on the radio sight. In this way, the accuracy of the artillery on our ships will be higher. Zhang Zhimu admired Shi Tao's associative ability.

"That's great!" Shi Tao was so excited that he didn't know what to say.

Zhang Zhimu asked Shi Tao: "When you are sailing, in the vast sea, the most important situation you need to know is your own position, and then the direction, right?" ”

"Yes!" Shi Tao looked at Zhang Zhimu when he answered, he knew that Zhang Zhimu would not ask such a simple question for no reason, "We usually use the compass to determine the direction, and now we can measure the position through the sextant." However, the compass cannot be used in the north in winter, because the compass floating in the water will freeze, and other methods will be used. For example, look at the equality of the stars. ”

"That's right! The water-floating compass you used was used by Zheng He when he went to the West. I suggest you improve that compass. It is necessary to make a sealed type, so that the water in it can be replaced with alcohol, and under normal circumstances, the alcohol is not easy to freeze. Isn't that the solution to the problem? Zhang Zhimu suggested.

"Oops!" Shi Tao clapped his hands and said, "This problem is solved so easily, why didn't we think of it?" This has to be improved immediately. ”

"And yes!" Zhang Zhimu didn't care about Shi Tao's surprised looks, and continued, "You use the sextant and the method of pulling the stars across the ocean, but it is useless on a rainy day. And rainy days are the most likely to go wrong, aren't they? ”

Shi Tao nodded and said, "Yes." Then wait for Zhang Zhimu's next words.

Zhang Zhimu smiled and said: "You are all here today, I suggest that we should start doing radio navigation!" ”

"Radio navigation?" Shi Tao looked confused. Yang Chang didn't speak.

"Actually, this thing is just a piece of window paper, which sounds very hanging." Zhang Zhimu said, picking up a bowl and putting it aside, saying, "We built a radio transmitter on the seashore, and then we built a radio receiver on a ship at sea, using a loop antenna." If our antenna torus is perpendicular to the direction of transmission of the radio station, the power received is the maximum. On the contrary, our loop antenna surface is parallel to the direction of radio transmission, and the signal received is minimal. In other words, this loop antenna surface is pointing in the direction of the transmitter? ”

Yang Chang nodded and said, "That's right!" ”

Shi Tao suddenly understood, "Oops! Is this the case, we set up two separate launch pads on the shore, and measured the direction of our ship relative to the two launch pads, and the two launch pads and our ship form a triangle. Then the distance and position of the two launch pads are determined, and the position of our ship is determined. ”

"Yes, yes!" Yang Chang: They all understood at once.

Seeing that everyone understood, Zhang Zhimu said: "There is another way, we can send an interrogation signal from the ship to the launch pad, the launch pad answers the signal, and the ship measures the delay of the answer signal, and the distance from the ship to the launch pad can be measured, so that the distance between the two launch pads can also be measured through the triangle to measure the position of the ship." ”

Yang Chang said: "Mr. Zhang, I think the easiest way is the first way. With our existing technology, there are no obstacles. I suggest that we first select three places along the coast, preferably on the top of a mountain, and build three high-power transmitting stations. An easy-to-use marine navigation device is then being developed. At least we can navigate the waters. ”

"That's right! Mr. Zhang, we should get it right away. "But I suggest that we build a launch pad at the southern tip of Hainan Island, Haiphong in Annam, and Sulu." That way, we can use radio navigation to Nanyang. ”

"To build a radio navigation station, there should be a backup of two transmitters and a backup of diesel generators. There should be a large capacity battery backup in the mountains, and wind power generation and storage in the mountains can also be used. It is also a problem for personnel to be on duty all year round in the high mountains, and there must be a rotation mechanism. I think this department is in charge of Shi Tao's naval army. ”

Shi Tao said: "No problem, I'll take care of this matter myself." ”

"That's right! Yang Chang, you should build such a transmitter as soon as possible, and you must build a miniaturized receiver. Because of Li Wei, their delta-wing flight team did not dare to fly far because they were afraid that they would not be able to find the airport. Now they navigate entirely on ground terrain features. If there is such a launch pad, they can fly back to the airport in the direction of the launch pad. Zhang Zhimu said.

Hearing Zhang Zhimu talk about Li Wei's flying team, Shi Tao couldn't help but ask: "Mr. Zhang, I also heard below that we have an air force, is it true?" How far have they come? ”

"Huh!" Zhang Zhimu said with a smile: "Li Wei, they do have a flying team. They train hard. Now the first pilots can fly long distances. It can not only drop bombs in the air, but also take pictures in the air and correct and command the artillery fire from the air. It's a force that we've always been reborn. It's still in its infancy, though. Yang Chang: You also have to develop some special and lightweight radio stations for them. By the way, there is also this radio navigation device. ”

Yang Chang said: "No problem. We'll do it as soon as we get back. Now we have a group of trained technicians who can do more work separately. ”

When discussing technical issues, whether it was Shi Tao or Yang Chang, they all forgot their respective identities, and talked and even argued with Zhang Zhimu very harmoniously. Zhang Zhimu likes this atmosphere very much.

Shi Tao is a technical navigator, and after he arrived in Yaogang, he has always been particularly keen on technology. In addition to organizing the survey of the main rivers and roads in the Ming Dynasty, the survey team that could be sent overseas in Nanyang has sent personnel. Shi Tao and the others also helped Li Zhi train a lot of personnel, so that many of Li Zhi's people also have the ability to survey terrain and location.

Just as they were drinking and talking, Li Zhi suddenly ran over.

Li Zhi was also familiar with Shi Tao and Yang Chang, but Li Zhi greeted them, declined the invitation to drink, and invited Zhang Zhimu to go out to talk.

Zhang Zhimu saw Li Zhi's appearance and knew that something big must be something, so he followed Li Zhi out.

Li Zhi said to Zhang Zhimu: "There is an urgent matter, a telegram from Liaodong said that many troops from the Manchu Qing Dynasty have begun to assemble, I don't know why. It stands to reason that now that Liaodong is already covered by heavy snow, they are also going to celebrate the New Year this season, so they shouldn't gather troops? ”

"This is a strange thing," Zhang Zhimu said, "and what actions do they have after the Spring Festival?" However, the Manchus lived between the white mountains and black waters, and adapted to life there, and it was difficult for them to march and fight in winter. Isn't it that they want to increase the number of troops at Shanhaiguan during the Chinese New Year, and take advantage of the slack of Shanhaiguan soldiers to carry out a sneak attack? ”

"That's not right! Mr. Zhang. Since they know that we are going to attack them, they should find a way to reinforce Jinzhou and strengthen our defense, right? Li Zhi analyzed.

"Huh! Maybe we didn't deliberately reveal that we were going to attack Liaodong, and they won't carry out a winter sneak attack yet. According to the character of the Manchus, they would not sit back and wait for others to beat them. They want to take advantage of the time when everyone is lax and raid Shanhaiguan. If the raid is successful, they can take the initiative when we attack next year. Zhang Zhimu thought about it and said, "Let's study it with Uncle Chen and Mr. Ouyang tomorrow." However, you should send this information to the emperor immediately. Let the emperor remind Wu Sangui of Shanhaiguan not to be careless. ”

When Zhang Zhimu returned to the wine table, everyone knew the rules and didn't ask Zhang Zhimu what happened. But Zhang Zhimu said to everyone: "I'm sorry everyone, something happened just now." Don't discourage everyone's interest in drinking! ”

"No, no!" Everyone said.

"Just now Li Zhi sent a telegram back from our intelligence officer in Liaodong saying that there was a sudden build-up of troops on the Manchu side. This is not normal. Zhang Zhimu said.

Shi Tao smiled and asked, "Mr. Zhang, do they still dare to take action against us in the Manchu Qing Dynasty?" ”

"Huh! The Manchus were not so stupid! Zhang Zhimu smiled and said, "I'm worried that they will do something to Shanhaiguan." I have already informed the Emperor of his intentions. Looking at the world, no one has dared to touch our kiln gang people. ”

Zhang Zhimu's arrogance infected everyone, and soon everyone recovered and drank.

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New progress in "Memories of the Southern Song Dynasty": the Battle of Yashan, the defeat of the Yuan army, the counterattack of the Song army, and the landing in Fuzhou.