Open an aircraft carrier to fight against Japan

Lin Yuan smiled and said: "Of course we need to discuss it. I can tell you clearly that the electronic warfare module on our J-25 is not competent for this mission."

Xu Feng asked: "Why can't I be competent? When I fought against the Japanese radar last time, the electronic warfare module performed very well."

Lin Yuan said: "This time is different from last time. Last time we used the electronic warfare module for tactical support, but this time the mission already has the nature of strategic reconnaissance. Last time the Japanese army only had one radar. It is impossible for the Japanese army to deploy only one radar this time, and there will be many types. I can only think of two types: long-range warning radar and anti-aircraft gun guidance radar. different."

"What we need to do is to calibrate the position of the radar. In electronic warfare, prior knowledge is required to calibrate the position of the radar, which is to know the situation of the radar in advance. But now we don't know anything about the situation of the radar, so we need to find out first. The transmission frequency, pulse width, etc. of each radar, this is a huge workload, which has exceeded the capability of our electronic warfare module."

Xu Feng said: "Then we use electronic warfare pods?"

Lin Yuan said: "Yes, this time we dispatched the two-seater J-25, each carrying an electronic warfare equipment operator, and the electronic warfare equipment operator is responsible for the operation of the electronic warfare pod."

Xu Feng said: "Okay then, we will deploy the two-seater J-25 with an electronic warfare pod."

Lin Yuan said: "There is one more thing I want to remind you. Although our fighter planes have stealth design, but the Japanese military's radar works in the low frequency band, their radar will still detect you."

Xu Feng said with a smile: "I already know. Didn't they find us during the last battle? But it doesn't matter, it's useless if they find out, because the positioning accuracy of the low-frequency band is not high, and they can't accurately determine our position , let alone guide anti-aircraft guns to attack us."

Lin Yuan smiled and said: "That's true, so this operation of yours is safe and sound, okay, you go to meet your old lover, I'm going back too, after I go back, I will open a meeting with the comrades of the Japanese Liberation League." Yes, to promote our great strength."

The two then acted separately. Xu Feng returned to Lushun, mobilized four two-seater J-25s, added electronic warfare pods, and then determined the reconnaissance flight route. After everything was ready, the four aircraft flew in the early morning of April [-]. We took off at four o'clock and flew towards Wonsan.

After taking off, Xu Feng raised the altitude to [-] meters, and then flew at the most fuel-efficient economical speed. When he arrived at a distance of [-] kilometers from Wonsan, Xu Feng picked up the communicator and gave an order: "I am Dongyao, the order: Each unit divides the airspace according to the schedule and conducts reconnaissance operations."

After Xu Feng finished speaking, the voices of three other fighter pilots came from the communicator: "Dong Er understands!" "Dong San understands!" "Dong Si understands!"

Xu Feng received the report from the pilots of the three fighter planes, turned his head and looked out the porthole, and saw that the three planes had changed their course and flew in other directions, then turned back to the electronic warfare equipment operator Su Heng behind and said with a smile: " Old Su, wake up, it's your turn to play."

Su Heng smiled and said, "I've been awake all the time." Su Heng then turned on the receiver of the electronic warfare pod and said, "This place is more than 300 kilometers away from Wonsan. Do we need to start it up so early?"

Xu Feng said with a smile: "I checked the information yesterday and found that the early radar had a range of [-] kilometers. We should be able to receive the Japanese radar signal at this distance now."

Su Heng smiled and said: "Then let's try." Su Heng stared at the display screen in front of him, and saw some messy waveforms appearing on it from time to time. He knew that it was natural noise. There are many sources of these noises, such as the inside of the receiver. Thermal noise from the environment, electromagnetic radiation from nature, etc.

The upper left corner of the screen displays the altitude, speed, and distance to Wonsan. Su Heng glanced at the altitude: [-] meters, and said to Xu Feng: "Can it be higher? The probability of receiving a signal will be lower. Bigger."

Xu Feng then pulled the control stick to control the downward deflection of the ailerons, the airflow pushed the ailerons upwards, the nose was raised, and the plane climbed upwards until Xu Feng reached 1000 meters before allowing the plane to level off again. At this time, Su Heng saw a series of pulses appear on the display, and he immediately said: "Radar signal is found, please stabilize the course."

In order to obtain a longer detection distance, the radar will use the antenna to concentrate the electromagnetic waves in one direction. In this concentrated direction, the detection distance is the longest. If the reconnaissance receiver wants to receive the electromagnetic waves emitted by the radar, it must align the receiving antenna The emission direction of the enemy's radar, but before detecting the enemy's signal, no one knows where the enemy's radar is emitting, so once the enemy's radar signal is found, the current heading must be maintained, the purpose is to continue to find the opponent radar signal.

The radar antenna rotates. After irradiating the J-25 driven by Xu Feng, it turns to another direction. It takes a while to turn back again. During this time, Su Heng recorded the received pulses and sent Back to the electronic warfare intelligence processing center, while analyzing the enemy's pulse.

At this moment Xu Feng asked: "Old Su, according to your analysis, what kind of radar did the Japanese army send out this pulse?"

Su Heng said: "The pulse frequency is 280 megahertz, and the pulse width is three microseconds. The radar that emits the pulse is about [-] kilometers away from us. I think it should be a long-range warning radar."

While Su Heng was talking, another series of pulses came in. Su Heng said: "There is another pulse, which is the same as the last pulse, and it is from the same radar."

Xu Feng asked: "Is it possible to determine the specific position of the radar according to the direction finding route?"

Su Heng thought for a while and said: "Okay, let's start measuring the position of the radar." Xu Feng then slowed down his flight speed, turned an angle to the left, and started to fly in an "S" shape. The flight control system sends the aircraft altitude and speed data to the electronic warfare pod, and the electronic warfare pod will estimate a range based on these data and the radar pulses found by the enemy. This range is an ellipse, and the Japanese radar must be deployed. in this ellipse.

The aircraft flies in an "s" shape, which increases the time it takes to fly over the target, and the number of pulses received by the electronic warfare pod also increases. Every time a pulse is received, the electronic warfare pod draws an ellipse, and these ellipses will There is an intersection, the radar deployed by the enemy is in this intersection.

Su Heng looked at the screen in front of him, and saw that ellipses were drawn one after another, and the intersection area was shrinking. At this moment, the radar signal of the Japanese army disappeared!