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Chapter 926 Signal Guidance Station

When Zuo Zhong heard Gao Ziheng's answer, he immediately asked him to elaborate. In terms of aviation technology, this man was a rare professional talent in the Republic of China.

Gao Ziheng nodded and explained the development of nighttime ground guidance, or aircraft navigation, in order to better answer his question.

"Deputy Director Zuo, ever since the American Wright brothers invented the airplane, for a long time, airplanes did not have any navigation equipment and relied entirely on pilots to visually observe iconic landmarks and fly along mountains or rivers.

However, without landmarks, how to prevent aircraft from getting lost in the sky where visibility changes greatly has become an important issue. Civilians and military forces in various countries have conducted relevant research on this and come up with many methods.

For example, in the 1920s, the Americans invested in building a large number of airmail flight road signs on the ground. The main body was a huge arrow, with a length of about 20 meters and a range spanning the entire United States.

These arrows are painted a bright lemon color, and there is a 15-meter-high tower near each arrow. There is a high-intensity gas lamp on the top of the tower to remind passing pilots to pay attention. (There are Easter eggs)

"Because of this easily identifiable design, USPS pilots can see the arrows from dozens of miles away and follow the arrows to the next location several miles away."

At this point, the plane slowly stopped, and the agents dragged the ashen-faced Wu Xiwen out of the cabin. Zuo Zhong and others also walked down the gangway and chatted, and came to a conference room at the airport.

Everyone found a place to sit down. Wu Xiwen was escorted to a corner, and several spies surrounded him vigilantly. Gao Ziheng rubbed his sore thighs and continued to introduce.

"However, this method is expensive and cannot be used in foggy weather, which greatly limits the flight range of the aircraft. It was fine during the peaceful period, but it seems a bit useless in the real period.

Zuo Zhong interrupted Gao Ziheng's introduction and asked with some confusion: "Can the aviation pointing platform you mentioned allow the Japanese to fly from thousands of miles away to the mountain city to accurately bomb the Huangshan official residence?"

Gao Ziheng and Guan Shaoyu knew the seriousness of the matter and replied in unison.

"Secretary-in-Chief, there is a cemetery nearby. Someone should be singing a funeral performance. I came here before when I was investigating the whereabouts of the officials in the official residence. Don't worry, there are no residents around here."

"good."

Gao Ziheng not only explained the principles, but also drew a schematic diagram on paper. It is very simple, even people who don’t understand radio can understand it at a glance (there are easter eggs).

Gu Qi and others looked around the note for a while and roughly figured out this technology, then a question came to their mind.

Since the Japanese can bring things like radios into the official residence, I don't know if they can bring in explosives, but the security work in the attendant's room is obviously not in place.

"Wait a minute."

"Of course not."

The first aviation pointing beacon of the Republic of China was built in Huaniaoshan, Zhejiang Province in the 16th year of the Republic of China, and the second one was built in Chengshantou, Shandong Province in the 21st year of the Republic of China, and the effect was pretty good."

After thinking for a while, he looked at the other party: "Director Gao, you just said it can be done. Could it be that some countries have overcome the technical difficulties of radio navigation and achieved precise guidance for bombing?"

After saying that, he turned his head slightly and saw Wu Xiwen's body shaking. Now he was even more sure that the deputy director's judgment was correct, otherwise the other party would have nothing to shake.

In this case, let alone guiding the aircraft, I am afraid that the Japanese will be discovered as soon as they turn on the aircraft. The current monitoring records have not found any abnormal signals in Huangshan.

When it comes to getting involved with the man in the official residence, no matter how small it is, it's a big deal. Just get the 100 barrels of aviation gasoline. They don't want to get involved in other things.

If the aircraft flies in the middle area between the two signals, it can receive short-tone and long-tone signals with the same intensity at the same time. If it yaws, one signal will become stronger and suppress the other signal.

Zuo Zhong nodded when he heard this. If anyone else said this, he would raise a question mark, but this person has fought with the Japanese Air Force many times and has a very clear understanding of his opponent's capabilities, so his evaluation should be objective.

Gao Ziheng said as he took a piece of paper, drew two horizontal lines on it, one short and one long, and marked the four words "short sound" and "long sound" next to it, and then looked up at Zuo Chong.

After the incident, we also checked and found nothing suspicious, but... the official residence is so big, it is impossible to determine whether there are any problems with the lines in other places, so I recommend a thorough inspection of the entire official residence."

Gao Ziheng shook his head and returned helplessly: "This thing can only allow the pilot to roughly judge how far away from the airport it is. If bombing is carried out, it is also necessary to find out the distance between the target and the airport. The two are used in conjunction with each other.

Looking at the dark mountains on both sides of the strait, Zuo Zhong lit a cigarette and stood on the bow of the boat. Under the dim moonlight, Changjiu became extremely tame and calm.

As soon as these words came out, everyone immediately reacted, yes, hiding it in the official residence. In this way, even if the electronic detection vehicle detects the signal, it will treat it as normal communication and ignore it.

"Chunyang, have you checked the wires in the official residence? Are there any lines of unknown purpose, especially those that have been connected without permission from the Attendant's Office?

"Director Gao, Captain Guan, thank you for your help. We will leave first. Please keep this matter confidential today. If anyone asks you about it, please contact me immediately."

If you want to bomb a city, that's no problem. After all, the target range is large and you can hit it. Bombing a building is simply impossible, at least not with the skills of Japanese navy and army pilots."

"Deputy Director Zuo, you are an intelligence officer and have taken telecommunications courses. You should know the principles of Morse code. The so-called code is the use of short and long sounds combined in regular patterns to represent different meanings.

Zuo Zhong did not look at the schematic diagram, but sat aside and put his hands on the table, tapping his fingers lightly on the table. After a long time, he slowly asked Wu Chunyang something.

The Attendant's Office is in 24-hour contact with military and political agencies in various places. The Japanese can hide the signal guidance station in the official residence, but no matter where it is hidden, the signal station must be powered on."

The dilapidated little robot boat turned on its full power and headed upstream, puffing out black smoke, and soon left Guangyangba Airport behind.

Zuo Zhong also noticed Wu Xiwen's strange behavior, but did not expose it on the spot. The scene had not finished yet. He stood up and bowed his hands to Gao Ziheng and Guan Shaoyu to say goodbye.

The pilot corrects the direction accordingly, and the heading problem is solved. As for how to know whether the aircraft has reached the target, there are many ways. I think there are two more reliable ones.

Wu Chunyang also noticed this scene, knew something in his mind, and raised his voice slightly: "In order to prevent eavesdropping, Yunxiu Tower where the envoy lives and Songting where the wife lives will check the lines every month.

By the time of the European War, Western science and technology developed explosively. As a new carrier that was invisible and ignored the weather, radio was regarded by various countries as a breakthrough in navigation.

When I was studying in France, I heard that the British Marconi Company was experimenting with a new technology. They used two radios to transmit Morse code, one to transmit short tones and the other to transmit long tones.

He didn't run away, but the deputy director was right when he said that the signal control station was real, and the Japanese had even brought it to the committee member's side. Now I don't know how many people were going to die.

One method is to calculate the mileage based on flight time, but the error is relatively large. The other is to set up an auxiliary signal transmitting station in another place and use the beams transmitted by the two stations to converge to the target.

"clear."

At the same time, the pilot uses the signal strength of the beacon and the compass to determine the location. The advantage is that it is not limited by time and weather, has a long range and a short positioning time.

Gu Qi and others looked at each other in confusion. They couldn't see anything at night. How could they know who did this? However, Wu Chunyang stood up and explained a few words.

Assuming a war breaks out, bombers can rely on the signal guidance platform established at the front line to carry out precise strikes on a certain target. The Japanese probably used this method to bomb the official residence.

Some people also took the magnetic compass and sextant into the plane based on their navigation experience, but there was still a problem. The speed of the plane was much faster than the speed of the ship, so these devices could not play their role.

In addition, they were looking for suspects before and were looking for who had gone out. Now it seems that the direction is completely wrong. The Japanese spy does not need to go out at all and can guide the bomber directly from the official residence.

As a result, radio navigation technology came out one after another. The specific method is to install radio navigation beacons near the airport to help aircraft accurately fly to the airport and land.

Suddenly, he heard the sound of a suona playing from the shore. Thinking that noise was strictly prohibited in the air defense regulations, he frowned and asked everyone what was going on.

Zuo Zhong felt relieved about the two of them. After shaking hands, he left with his men and Wu Xiwen, returned to the dock and boarded the navy patrol boat to return to the mountain city.

——If the situation is as Gao Ziheng guessed, where can the Japanese signal guidance station be located?

The Huangshan official residence is not a front line. As a cave for the commission, the surrounding area is heavily guarded. Electronic reconnaissance vehicles from the Central Command and the Military Command often patrol the area.

The disadvantage is that the radio has poor anti-interference and requires the support of a navigation station. Once the navigation station fails, the corresponding navigation equipment cannot be used, and is prone to malfunctions and poor accuracy.

The agents who were confused looked at Wu Xiwen in the corner and found that the other person was looking at his nose and his heart. He was sitting there motionless and seemed not to have heard what Gao Ziheng had just said.

But this requires very reliable radio technology. I’m not sure whether the Japanese have done relevant research. That’s what you, Deputy Director Zuo, have to do. I’m just analyzing it from a purely technical point of view.”

At this time, Wu Jingzhong and Gu Qi, who are good at observing words and expressions, discovered that Wu Xiwen's nostrils dilated, which was a signal that the brain needed more oxygen when he was emotional.

As long as there are no residents, Zuo Zhong, relieved, waved his hands and started thinking about the finishing work of the case. This matter is actually not complicated. The case can be declared over after finding the signal guidance station.

In this era, unlike later generations, the size of electronic products cannot be reduced, and the area of ​​the official residence is very large. As long as there are enough manpower, even if you dig three feet into the ground, you still have to find the equipment installed by the Japanese.

Zuo Zhong listened to the distant sounds of the riotous drama, raised his hand and flicked the cigarette butt into his clothes, ready to turn around and assign the task. This was not an easy task.

But at this moment, he seemed to have thought of something. His body paused and then returned to normal, and he calmly arranged the search for the Huangshan official residence.
Chapter completed!
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