Open an aircraft carrier to fight against Japan

Sun Dehai said: "Although we detected this signal before, it was always far away from us, so we didn't pay attention to it. But today is different. The signal is very close to us, only about 20 kilometers away!"

Lin Yuan's heart moved, and he said: "More than 20 kilometers? Isn't that on the sea? Then there must be a ship using radios. The radios are still used by the military now. Then this ship must be an enemy ship. We are here There is a radar installed on the top of Longtou Mountain in Lushun Port, so it is impossible for any suspicious ships not to be spotted!"

Sun Dehai said with a smile: "There are so many ships passing by outside Lushun Port every day, and the radar station can't verify the identity of every warship. Since the identity cannot be verified, how can we determine which ship is suspicious? It is more difficult to find this ship. Go to heaven!"

Lin Yuan said: "I have a solution. Our radar has records of the ships passing by. Please give me the time and distance when the signal was received. I will take this time and distance to the Longtoushan Radar Station and record the records of the passing ships. Call it out and see the distance from them to you when they send out the signal, the ship with the same distance as you gave me is the ship that sent the signal!"

Sun Dehai thought for a while and said: "Your method is theoretically feasible, but it is very difficult to operate, because the signal transmission time of the other party is very short, so when we estimate the distance, there is a big error, within plus or minus five kilometers Within the range, that is to say, the distance you want to investigate is 25 kilometers to [-] kilometers, and you can calculate for yourself, how many ships will be within this range?"

Lin Yuan nodded and said, "I see, you give me the time and distance first, and leave the rest to me."

Sun Dehai tapped a few times on the keyboard, and then said to Lin Yuan: "The time when the signal was received was 10:47:15, and the signal lasted for 17 seconds and ended at 10:47:32. Already know."

Lin Yuan took out a small notebook, recorded the time and distance information, and asked, "Have you deciphered this group of signals?"

Sun Dehai shook his head helplessly and said: "It's very difficult. First of all, the number of ciphertexts we obtained is too small, so it is difficult to analyze the frequency of symbols in it. Secondly, we don't know what language the other party is based on, so even if we analyze the symbols Frequency is also difficult to analyze the meaning of symbols."

Lin Yuan said: "Well, you should monitor this signal first, and tell me when it appears later." Lin Yuan came out of the house after speaking, thinking that Longtou Mountain was far away, so he found an off-road vehicle, Driving it to Longtou Mountain, the base at this time is not as barren as it used to be. Now the base is full of trees. In the warm winter of Lushun, these trees are still green.

Lin Yuan was driving on the road, and suddenly saw a woman sitting on the ground with her back facing him by the edge of the woods, shrugging her shoulders, as if she was crying, Lin Yuan thought: "This figure looks familiar from the back, but I want to Who is she? I don’t know what sad things happened to her, why is she crying here?”

Lin Yuan parked the car aside, got out of the car and walked towards the woman. When the woman heard the footsteps, she turned her head and looked at Lin Yuan. Both of them exclaimed in surprise, "Why is it you?"

It turned out that this woman was Lin Xuezhi who was rescued by Lin Yuan from Tou Shanman. When she saw Lin Yuan, she burst into tears and laughed, ran to Lin Yuan and said with a smile, "Brother, why are you here?"

Lin Yuan raised his hand to wipe the tears off her face, and asked, "You still ask me, and I still ask you, why are you crying alone in the bushes?"

Lin Xuezhi's eyes turned red again when she heard this, and she murmured: "I feel so wronged."

Lin Yuan hurriedly asked, "What happened?"

Lin Xuezhi hesitated for a long time, then handed a piece of paper to Lin Yuan, and said, "You can read it yourself." Lin Yuan took the paper and looked at it, only to see that there were a lot of names on it, and Lin Xuezhi's name was ranked first. , Lin Yuan asked: "Is this a list? What kind of list is it?"

Lin Xuezhi cried and said, "Didn't you ask me to teach at the secret agent training base?" It turned out that after Lin Xuezhi surrendered to Lin Yuan, Lin Yuan arranged her in the secret agent training base. When it was time to perform the task, Lin Yuan smiled and said, "That's right, what's the matter?"

Lin Xuezhi wiped away her tears and said, "This list is the 'worst teacher list' summed up by the students, and the one ranked first is the worst..."

Lin Yuan laughed when he heard this, and said, "I thought it was a big deal..."

Lin Xuezhi said coquettishly: "Brother, you are still laughing. In order to do a good job in class, I prepare lessons until late every day, but the students actually say this about me, I..." She burst into tears as she spoke.

Lin Yuan said softly: "Okay, okay, don't cry, what class are you teaching?"

Lin Xuezhi said: "Introduction to intelligence work."

Lin Yuan said: "Students in this class are not serious and think it is useless. Okay, let's not talk about these things. I will take you to the beach to relax."

Lin Xuezhi shook her head fiercely, and said, "No, I want to go back to prepare lessons, and I will definitely not let them say that about me again!" Seeing her determined look, Lin Yuan couldn't help but think of her struggling to get out of the snow-covered woods back then. Looking at the scene, I thought to myself: "What a stubborn girl."

Just as Lin Yuan was about to say goodbye to her, it suddenly started to rain heavily. Lin Yuan hurriedly opened the car door and said, "This year is really weird. It rains in the winter. It is still far away from the secret agent training base. If you go back, you will definitely It will be soaked, hurry up." Lin Xuezhi got into the car and asked, "Where are we going?"

Lin Yuan smiled and said, "Go to the radar station on Longtoushan." Lin Yuan drove the car all the way, and soon came to the foot of the mountain. He showed his ID to the guard at the gate, and the two went up to the top of the mountain. Lin Yuan found the station master. Said: "I need to call the situation of the ship that was 10 to 47 kilometers away from the base at 15:25 this morning."

The stationmaster replied cheerfully: "So that's the case. It's a small matter. I'll transfer it to you right away. You can wait for a while. If you feel bored, you can go and see the sea view outside." The stationmaster went to another station after speaking. A room, after more than ten minutes, they greeted: "Okay, I have retrieved the ship's situation!"

At this time, Lin Xuezhi was still watching the waves on the sea with great interest, so Lin Yuan came to the room alone, and the comrade in charge pointed to the computer screen and said: "There are 45 targets that meet your requirements, of which 44 targets we They all have records and spectrum information, and they are all cargo ships departing from Yingkou Port, except for one ship that we have not filed."

Lin Yuan frowned, and asked, "No record? Why no record?"

The station master smiled and said, "You see, the radar reflection area of ​​this ship is relatively large. It should be a fishermen's sailboat. There are too many fishermen's sailboats. It is not surprising that there is no record."

Lin Yuan suddenly thought: "Didn't Feng Laoliu's boat leave this morning? This boat might be his boat." At this moment, he heard the guards outside running in and saying, "Report to the station master, don't you?" Alright! Something went wrong!"