spy ace

Chapter 376 Multi-Point Direction Finding
Fan Keqin said: "But he didn't dare not confirm it, because he was afraid of missing a key task. So he must contact the Shanghai headquarters. After receiving the telegram, the Shanghai headquarters will confirm the situation and then reply to him. Then he Once sent and received twice, I thought I could use this to make a fuss."

Following Fan Keqin, he glanced at Han Qiang and said, "However, what you just said is still very vague, so my idea is obviously not valid."

Han Qiang waved his hand and said, "I can't say it's not true, but it's true. We can set up multi-point direction finding in advance, and the method of blackout in different areas to narrow down the scope of suspicion."

When it comes to professional technology, Fan Keqin is not very clear. He understands what multi-point direction finding means.Because this technology has another name, called triangulation positioning technology.In fact, this is just a difference in the name.But how to do it, he is a little bit clueless, after all, he is not a professional in this field.So he asked, "How to arrange it?"

Han Qiang didn't even think about it, and replied: "If we can really lure him to send a report, our targeted layout can still narrow the scope. For example, I have arranged monitoring points and monitoring stations in three different directions in our city in advance. Technical team, and after you publish in the newspaper, the radio station that appeared recently, or became active, must be the spy to be contacted by the encrypted message, and then my technicians will try their best to calculate a radio station with the strongest signal. line, and three line segments will be drawn in three directions, and the place where these line segments meet is the area where the station is located."

After hearing this, Qian Jinxun couldn't help asking: "Why didn't you use this method before?"

Han Qiang said: "I have used it, and I have been using it all the time. In fact, this technology is not a very powerful method at home and abroad, but it is almost the only way now. As long as you are engaged in technology, basically you can do it. Why did I apply for it in the early days? With so much money, there are basically secret monitoring points set up in every district of the city. But then again, Little Japan is not a vegetarian, and they naturally know the means of counter-reconnaissance. Shorten the time of sending reports, and even move The sending location, and others only appeared once and then hidden. This is a method to limit multi-point direction finding, and it is difficult to really catch them. "

Hearing his answer, Qian Jinxun nodded in understanding, and said, "Then... what Keqin said just now, can you handle it?"

Han Qiang said: "It should be possible, because the previous monitoring was passive monitoring, which is the monitoring point we set up. Although we are constantly listening to various signals over our city, as long as the other party does not turn on the phone or send a report, then we will There is no way. And we don’t know when the other party will turn on the phone and send the message, so the suddenness is too strong, and we may have no time to react, and the other party has already ended. But this time is different, the method Keqin said, make a mistake The order of the symbols is published in the Minsheng Daily, and the other party reads it both familiarly and unfamiliarly, so he has to send a report to inquire about the situation. Therefore, this means that we can control the sending time of the other party. It is best to prepare in advance. It’s not a problem to come up with a rough area.”

Fan Keqin asked: "If I prepare now, I will publish it in the newspaper the day after tomorrow. What kind of scope can I narrow it down to?"

Han Qiang thought for a while, and said: "If the other party is indeed in the urban area, I think it should be no problem to reduce it to one-third of the area. It depends on the length of his report. The longer the time, the smaller the range."

Fan Keqin said: "One-third of the district? That's still a bit big."

Han Qiang said: "I'm just estimating now. I don't know the specifics. It may be smaller, but it may also be larger."

Fan Keqin thought of this, looked at Qian Jinxun, and said, "How about it? Do you want to try it once?"

Qian Jinxun thought about it, and said: "If you try it once, what should you do next? Immediately blockade the area, enforce martial law, and search from house to house?"

Fan Keqin said: "No! He sent the letter once and received it again. We have two chances." Then he looked at Han Qiang and said: "You just mentioned a blackout method, how to do that?"

Han Qiang explained: "After using multi-point direction finding, we have determined an area, and then, we can divide this area into several smaller areas, and when the other party receives the telegram, we will pull power to these areas one by one. If the signal in the powered area stops while the power is being pulled, the target must be there."

After hearing this, Fan Keqin nodded and said, "Then there is really no rush for this. It must be arranged in advance, and all aspects can be coordinated before we can start."

Qian Jinxun said: "This old Han should be able to solve it. You first arrange multi-point direction finding, and tell Keqin when you are ready, and then he publishes the news. After the other party sends a report, you can use this method to lock an area and coordinate immediately. The Electric Power Bureau divides the power network in that area. Then let Lao Han’s technical team pull the dedicated line as quickly as possible, and take them all over. Then everyone guards a line, and when the other party receives a call back, let them dial immediately For the divided regional special lines, pull down the switch one by one. I believe that three to four seconds of power outage in each area is enough. Even if it is divided into ten areas, it is less than a minute? Unless the other party has a very short message and shuts down immediately , otherwise...you can definitely find him."

Fan Keqin nodded and said, "It's possible." Then he looked at Han Qiang.Han Qiang immediately nodded and said, "Just do it like this, I think it's okay."

With a way to deal with the matter, the three of them finally relaxed a bit. Qian Jinxun gave each of them another cigarette and said, "Keqin, when do you think the news should be published?"

Fan Keqin thought for a while, and said: "Yoshimune Yamaguchi has been hiding in the Sun God Restaurant for so long without showing his face, which means that this task requires accuracy, not speed. In addition, he also made it clear during the interrogation , then... the time can be put in ten days, from the time he arrived at the local area to the completion of the task, it was more than one and a half months, neither fast nor slow, so there should be no question."

Han Qiang said from the side: "That's great. Although the monitoring points in each district are ready-made, I still have to arrange them carefully to achieve the best effect. Ten days is enough, I only need one Just two days."

Qian Jinxun flicked the cigarette ash and said, "Let's discuss the details again. Can we go directly to the stage of pulling the switch the first time?"

Han Qiang thought about it, and said: "It's possible, but I'm afraid it will..."

(End of this chapter)