106 Chapter 106 - Night Detective (II)

Yang Niu said: "This location is in the territory of country Z, could it be that country Z has developed its own counter-artillery radar?" ”

Speaking of this, his fingers flew, he entered a string of instructions on the keyboard, and called up a illustrated information, and he couldn't help but breathe a long sigh of relief, nodded and said, "That's it." ”

Wang Xiaoyu next to him saw a picture at first sight on this information, which was a warrior off-road vehicle pretending to be a round, like a pressure cooker, but this "pressure cooker" was surrounded by a circle of corrugated metal sheets, and there are two explanations below:

"YLC-48 is a portable multi-functional reconnaissance radar, is a new equipment successfully developed by Huaxia half a year ago, this small radar works in the S-band, using circular phased array system and digital beamforming technology, can achieve all-round beam sweeping.

YLC-48 adopts active phased array radar technology, which has a detection distance of not less than 5 kilometers for UAVs with a radar scattering cross-section of 0.01 square meters, and has the ability to detect and track multiple targets in multiple directions, which can achieve 360-degree omnidirectional detection and tracking alone. It is mainly used to detect low-flying small UAVs and mortar PAO bombs, and can also be networked to form an anti-cruise DAO bomb network. It seems that they were pulled to country Z to test. ”

I don't know when, Xiao Shancha also came to watch this information, and after reading it, he asked Wang Xiaoyu worriedly: "Brother Xiaoyu, this radar is specially designed to deal with small drones, is it going to deal with us?" ”

Wang Xiaoyu comforted: "This new type of radar has just been successfully developed in China, and they may be testing it, how can we be a little person who is worthy of their use of the most advanced weapons and equipment?" ”

Xiao Shancha still asked uneasily: "Then will they give it to the Wild Wolf Army?" And what if that's the case, what about our drones? ”

Wang Xiaoyu said: "You can rest assured, the attitude of those big men towards the People's X armed forces is: they will not oppose it openly, nor will they secretly support it, that is, they will not help each other, and they will not be handed over to country A and the wolf army casually."

At the same time, next to Xinba Village in country Z, a radar car was quietly parked on the hillside, Zhao Feng and the three soldiers on duty stared closely at the screen of the laptop, and just now they detected that two small flying machines rose into the air on the hill not far from the national border, and they went all the way to the north, where only a few kilometers were the territory of country A controlled by the mercenary alliance. The east, west, and north sides of this place are surrounded by country Z, and these two small flying machines may soon fly across the border and enter the territory of country Z.

This is unreasonable, if it is a drone of the mercenary alliance, they should fly south, there is a position of the wolf army. What do they want to do when they fly north? Do you want to fly to the territory of country Z to carry out illegal activities? This couldn't help but arouse Zhao Feng's high vigilance. When I looked at it again, I found that in their flight trajectory, the drone flying in front of it flickered with the ups and downs of the mountains and rivers, and when the drone flew down the hillside, it descended into the valley and disappeared into the radar screen. After a while, it was only visible if the drone flew over the mountain beam and was caught by the radar. The other flew higher, slightly slower, and was more than 200 meters above the top of the mountain, but it was always tracked by radar.

"Is that a contour terrain matching flight?" Zhao Feng muttered, his heart did not go through the waves, judging from the speed and volume of these two aircraft, it is undoubtedly a civilian drone, but can a civilian drone match the contour terrain to fly? At least, Zhao Feng hadn't seen it before.

The two drones flew north for a while, less than two kilometers away from the border, and the soldier next to them asked Zhao Feng: "Staff Officer Zhao, do you want to take action?" In two or three minutes, they will cross the border? ”

Zhao Feng stared at the screen and replied, "Don't alarm it, these 2 drones are weird." Keep track of them to see where they landed, then notify the nearest troop to come and look. ”

As soon as Zhao Feng's words fell, the two drones turned west again, flew two or three kilometers, and then turned south again, they flew next to the border, but they did not fly across the border.

The section of the border that flew south was the Bainiluo River, and the two drones lowered their altitude at the same time, almost flying south against the river. Due to being blocked by the high mountains and approaching the limit of the detection range of the YLC-48 radar, snowflakes appeared on the radar screen in front of Zhao Feng, but the two drones had disappeared without a trace.

The soldier operator said: "I really don't understand, they crossed the mountains, went around in circles, and flew more than ten kilometers along the Bainiluo River, but they didn't fly over the border, where are they going to fly?" ”

Zhao Feng asked, "How many kilometers have they flown now?" ”

The operator measured it on the electronic map and said: "22 km"

Zhao Feng was surprised: "It's 22 kilometers, their machine, I have seen it in General Xiaohong's office, is an ordinary plant protection drone of Xiaoyu Company, the remote control distance will not exceed 1,000 meters, and it will fly out more than 20 kilometers?" Also, the small drone that flew in front of me, can you tell me if it is a contour terrain matching flight? ”

The operator looked at the soldier on the left, he didn't speak, and then looked at the soldier on the right, he didn't speak, so he had to spread his hands and show a helpless expression to Zhao Feng. Needless to say? That's exactly what it is.

Zhao Feng thought about it, and called a radar station somewhere on the border line, wanting to ask about the situation after the two small drones left the Nu River, who knows, the radar station said that during this time period, there was no aircraft activity around the border line at all, Zhao Feng couldn't help sighing, hey, these two small planes, flying close to the mountain, may be less than one meter in diameter, the height of the fuselage is only tens of centimeters, and the radar reflection area is within 0.1 square meters, which is not inferior to stealth aircraft, where can ordinary conventional radars be seen? If you want to monitor such a small aircraft, you have to rely on these two YLC-48 active phased array radar vehicles.

Zhao Feng said impatiently: "That's it, tomorrow we will make a detour to the mouth of the Mangxing River to continue monitoring, and this position will be left to the No. 2 car to take over." ”

On the top of the mountain, since Wang Xiaoyu knew that it was the YLC-48 radar in country Z that was tracking them, not the counter-battery radar of the Wild Wolf Army, he let go of his hanging heart. He thought to himself, as long as I don't fly across the border, I haven't broken the law, and I don't care about you, whether I like it or not.

Flying all the way, he controlled the plane, not as Zhao Feng thought according to the preset terrain matching in the flight, this is in the abdomen of the drone to install a toothpick box-sized laser rangefinder, the girl said on the Amazon to find, more than a week to arrive, the measurement distance can reach 2000 meters, it emits a very faint red light, almost invisible to the naked eye. The laser rangefinder scans the distance from the aircraft to the ground every second, feeds back the value to the flight control host, and the flight controller will automatically adjust the flight altitude according to Wang Xiaoyu's preset 50-meter altitude, and it will automatically fly with the ups and downs of the terrain, but it is indeed very similar to the automatic matching flight of the contour line, no wonder Zhao Feng misjudged.

At this moment, they had already flown close to the mouth of the Mangxing River, less than 500 meters deep at a depth of six degrees. Its current flight altitude is only 50 meters from the river surface, and there are more than 1,000 meters of mountains on both sides of the Bainiluo River, and it is impossible for them to receive any signal on the top of the mountain next to the Ziyan base, but at this moment, more than 1,000 meters above the top of the mountain, Xiao Camellia is controlling her drone in a circle, and there is a small iron box like a lunch box hanging under the belly, which is the airborne communication signal differential that Wang Xiaoyu and Yangniu made for two days, and the two-way signal propagation distance in the air has reached 40 kilometers, and now, The signals of the man and the machine over the Bainiluo River were transmitted back to the base through it. It is like a satellite hanging in the sky, no wonder it is not afraid of the barrier of mountains and rivers.

Although Wang Xiaoyu's airborne two-way signal differential can only relay a distance of about 40KM, it is a straight-line distance in the air, and it can already reach an area 60 kilometers away on the ground, and if it is combined with the high-power ground station of the cottage he made, it can ensure that it can ensure 80 kilometers of signal and data transmission in the air, which can already meet the needs of the battlefield at the tactical level. However, the bandwidth is only 100M, and it is not a problem to command 20~30 UAVs at the same time, and if there are more, it will be "traffic jams" and form a serious "delay". But there is no way to do it, the wireless network cards he uses are removed from civilian laptops, and they are only 100M at most, which cannot be compared with the bandwidth of several gigabytes used on military satellites.

Wang Xiaoyu slowly approached the plane to Shenliudu, and when it was about 200 meters away from the ferry, a stilted tower was erected next to the ferry, and it was obvious that it was a sentry post. He hovered the plane in the air, turned the camera under his belly, and took several high-definition infrared pictures in quick succession. It was Wang Xiaoyu who controlled the plane, and it was the foreign girl next to her who analyzed the picture, only to hear her say: "There are two soldiers walking around on this tower, don't get too close and be discovered by them." ”

Wang Xiaoyu said: "I know, I went around the ferry 360 degrees to take pictures, always keeping a distance of about 200 meters, how can they see the sky is dark?" ”

Xiao Shancha next to him reminded: "Brother Xiaoyu, don't be careless, you can hear the sound of the propeller if you fly too close!" ”

Wang Xiaoyu said: "You forget, we replaced the motor and propeller, the single-layer two-blade pulp was replaced with the upper and lower two-layer three-blade pulp, the diameter of the blade was also expanded, the speed of the motor was reduced by two times, and the noise of the propeller was reduced by half or more." We can't hear it even if we test it here for 50 meters, let alone they are 200 meters away? ”

The foreign girl who was looking at the picture next to her suddenly raised her hand and said to Wang Xiaoyu: "You go back a quarter of an hour, there is a bush of banana trees, the infrared radiation under the tree is abnormal, there may be someone lurking in it, you get closer and take a few photos." ”

Wang Xiaoyu listened, controlled the drone to do a backflip, and returned directly the same way, flying towards the banana tree marked by the Yangniu, until the distance was about 150 meters to take pictures, and then flew forward, took several photos at a different angle, and then probed the Yangniu's computer screen to see. One of them is very angled, with a red shadow peeking out from under the head of the plantain tree, half-lying as if sleeping. The girl asked, "Do you think this is a secret whistle?" It's just that why does this person look so weird? Pointed head? ”

Wang Xiaoyu looked at it seriously for a while, smiled dumbly, and said, "The wild wolf army is mighty, please ask the second senior brother to give them a sentry!" ”

The girl didn't react and asked, "Who?" Who do you say is keeping a sentry on them? ”

Xiao Shancha laughed out loud: "Pig! ”

The foreign girl said angrily: "Girl, who do you say is a pig?" Look at me confiscating your drone! ”

Wang Xiaoyu said: "Yangniu, don't get me wrong, the girl is saying that the animal sleeping under the banana tree is a pig, not a human!" ”

The foreign girl was stunned for a moment, looked back, looked at the picture carefully, and laughed at herself embarrassedly: "Oh my God, what a pig!" ”