Chapter 1198 Discovered?

Following Captain Zhang Xudong's order, the combat information center of the Jincheng suddenly became busy.

Different from passive positioning systems such as GPS, the Beidou first generation that is currently providing services requires the receiving terminal to send a request signal in advance, and then the ground control center station completes positioning and timing services.

Although this working mode results in a narrow effective service area, poor terminal concealment, and no altitude and speed measurement functions, it is not a big problem for a destroyer sailing not far from the Chinese coastline.

On the contrary, the advantages of fast first positioning speed and relatively high timing accuracy are quite meaningful for this mission.

After just a few seconds, a report came from a fighting position not far away:

"Report to captain... time synchronization is completed."

Sitting on it is a staff member of the Electronic Technology Group wearing camouflage uniforms but without a title.

Faced with the high-pressure scene on the warship, which looked like it was about to be fought, his voice sounded somewhat unconfident.

"Don't be nervous, just do it like the previous ground test."

Zhang Xudong left his position, walked slowly behind the operator, stretched out a hand and put it on the operator's shoulder.

When the 346 radar was originally designed, it did not consider dual-base coordinated operations with land-based radar stations. Therefore, this temporarily installed module is completely independent of the ship's combat command system. The captain cannot see the specific work from his position. Condition.

With the captain's encouragement, several temporary radar operators stabilized their mentality to some extent:

"Injecting orthogonal sampling and motion compensation algorithms..."

Another technician next to him reported in a deep voice while inputting a series of preset instructions into the system.

Soon, a sinusoidal calibration space spectrum appeared on the display.

However, the position of the spectral lines is not clear, and even the position and height of the wave crest are constantly changing.

"Inform Yongjia to leave the formation, activate the auxiliary antenna, and prepare to test the carrier frequency synchronization and phase calibration results."

Zhang Xudong took the microphone of the radio communication equipment and personally issued instructions to another frigate in the fleet.

What followed was a somewhat depressing silence.

All that remains is the occasional short beep from some device.

On the sea outside the CIC, the No. 526 frigate that was originally following the Jincheng quickly turned its bow and accelerated eastward, and raised an additional whip antenna above the helicopter hangar.

Active correction algorithms are extremely efficient when the number, location, and array manifold of radiation sources are known.

Almost at the same time that the calibration signal was sent out, the spectral pattern displayed on the Jincheng radar display began to change.

After several adjustments, the clarity of the spectral lines and the consistency of the wave peaks are clearly better than before.

At the same time, several ground radars located near the coastlines of Zhejiang and Min provinces are also performing similar work.

As receivers, they do not need the assistance of auxiliary antennas. They only need to separate the direct wave from the received signal, solve the initial phase, and finally compensate during signal processing...

"Comrade Captain."

About half an hour later, a technician took off the headphones on his head and turned to look at Zhang Xudong behind him:

"The calibration of the two radar machines has been completed. The relative initial phase errors of each antenna are concentrated within 0.75 degrees, the gross frequency deviation is less than 0.03Hz, and the equivalent input signal-to-noise ratio is about 70dB..."

"..."

Zhang Xudong was born in a navigation position and was not proficient in radar, but as the captain of China's first regional air defense ship, he had received a long period of training before boarding the ship, so he could understand the meaning of these numbers.

"Is the calibration effect so good?"

He looked at the screens lined up in front of him with some surprise.

During the ground test, comrades from the Electronic Technology Group and the Air Force Equipment Research Institute had been vaccinated many times, saying that the effect of this kind of dual-base radar modified half-way through the process might not be particularly satisfactory. As a result, Zhang Xudong had already given a considerable opinion in his heart. Low expectations.

However, the result in front of me is not only not bad, it can even be said to be quite good.

However, the technician shook his head and explained:

"The equipment has just been debugged, and the accuracy must be very beautiful. However, the constant temperature crystal oscillator focuses on improving the short-term stability characteristics, and the long-term stability capability is relatively average, so there will be a certain accumulated error in the subsequent continuous work, and the search state will probably be maintained continuously 2 -Needs to be recalibrated every 3 hours..."

Perhaps for radar developers, this is some kind of forced regret.

But for Zhang Xudong, who uses radar, a single start-up time of two to three hours is not actually short.

As the largest power consumer on the ship, 346 does not work 24 hours a day and night.

In particular, this mission is very targeted, and it is enough to be effective during the most critical period of time.

…

In the next two or three days, everything seemed to be full of excitement.

The Air Self-Defense Force's P3Cs and F15Js took off at an unprecedented frequency and frequently tested its southwest direction.

The fighter jets of the Chinese navy and air force moved forward in a targeted manner to intercept and investigate these enemies who were obviously planning evil intentions.

On July 19, the fourth day after the confrontation began, even the latest early warning aircraft that had just been put into service by China had been put into the early warning command mission.

It can be said that in the past half a century, this airspace has never seen such a tit-for-tat grand occasion...

On the KJ-2000 command aircraft, Jiang Zengjian, the commander of the Air Force of the Jinling Military Region, folded his hands under his chin and stared at the position of the opponent shown on the display in front of him.

In the past few days, the frequency of the Air Self-Defense Force aircraft has been crazy, making China, which has insufficient number of new aircraft, a little exhausted.

Therefore, the superiors decided to activate this aircraft in advance to give full play to the advantages of data link and detection distance, and provide a longer response time for the command and dispatch of the air formation.

"Taishan Squadron, prepare to go to J7 airspace to intercept the target aircraft group marked as 07. The enemy model is initially determined to be an F2 fighter..."

"Captain Huaihe, the aircraft group 04 in front of you has already lowered its altitude and retreated in advance. Pay attention to the remaining fuel and prepare to return..."

"Songshan 05, Songshan 06..."

Although all command orders still need to be spoken, thanks to the help of the latest data link, about 60% of the commands can be directly presented on the multi-function display in the cockpit of the fighter. Voice commands only serve as a reminder and confirmation, greatly reducing the work intensity of the commanders on board.

While issuing orders in an orderly manner, Jiang Zengjian is also paying close attention to the airspace further south.

Although the Air Self-Defense Force's battle looks large, most of its aircraft have not even flown over the so-called "middle line" unilaterally advocated by the other side, and they always maintain a safe distance of more than 30km from the Chinese interceptors.

In other words, it is completely a battle in the air.

It is likely to be just a feint.

The real protagonists are probably the ghost-like F22 fighters.

Of course, in order to ensure safety, the KJ-2000's activity area is located within the coastline. At this distance, the stealth aircraft itself may be difficult to detect, but as far as Jiang Zengjian knows, in order to ensure the best concealment, the F22 will not use the universal data link (receive only but not send) that easily exposes signal characteristics, so it is difficult to form close cooperation with ordinary third-generation fighters such as the F15.

This also means that the deployment of stealth aircraft will definitely bring some distinctive features to the entire airspace.

And the direction that the Air Self-Defense Force has never appeared is the focus of the most attention.

It is precisely for this reason that no matter how great the air pressure in the northeast direction is, he always keeps the two J-11B four-plane formations on the ground and does not allow them to take off...

About 400 kilometers away.

Colonel Evan Robinson is carefully maneuvering his plane and flying north on the scheduled route.

He had been observing the lively situation in the distant airspace through an E767 early warning aircraft, and it was basically confirmed at this time that most of the attention of the Chinese Air Force had been attracted to the relatively northerly direction.

Even if the opponent may still have some backups, as long as there is no absolute numerical advantage, the stealth aircraft can guarantee an advantageous position in the confrontation.

This is the conclusion drawn after countless confrontation exercises.

"The Self-Defense Forces have diverted the enemy's attention. We adjust the direction and prepare to deal with the ground radar on the coastline."

Robinson gave the order while looking down to confirm the radar warning information given on the multi-function display.

Although the Chinese seemed a little embarrassed, they were obviously well prepared.

The two most threatening signals, one from the area marked as Jingnan on the map, and the other from the sea outside Yongcheng, were at an angle to each other.

If the course they chose was slightly deviated, it would be easy to detect the side with a relatively large RCS, so that the opponent could make a targeted response.

Fortunately, after the disaster in 1999, the US Air Force also learned from the pain and summarized the way to fight against the anti-stealth system, and deployed a fully functional radar warning system on the F22.

When a threatening radar wave is found sweeping across the aircraft, the system will not only give the approximate location of the radiation source, but also remind the pilot to adjust the course or attitude at any time to minimize the reflected area exposed to electromagnetic waves.

Compared with the F117 or B2 that could only fly according to the established bombing route, the F22 has evolved into a more flexible and capable killer.

He could only see that after slightly adjusting the course to the west, the signs of the two radiation sources all returned to "completely non-threatening".

This means that even if you enter a distance of 200km or even closer, the opponent cannot clearly catch you.

Of course, the actual battlefield situation changes rapidly, and it is not possible to rely on these equipment rigidly.

So an excellent air commander is still needed to lead the battle on the front line.

And Colonel Robinson thinks he is the most qualified candidate.

However, what he didn't know was that just now, he just passed through a Z-shaped connection line formed by a dual-base radar...

As the four-plane formation got closer and closer to the Chinese airspace, the other pilots became more and more excited.

"Captain, should we go deeper later?"

The pilot of the No. 02 aircraft asked in a relaxed tone.

The US military's radio discipline has always been bad, especially the pilots of the 43rd Squadron, who are even more unscrupulous by relying on the ultra-highly concealed IFDL data link between F22 aircraft of the same type.

Robinson did not criticize this eager subordinate, but just rechecked the route map in front of him.

But in the end he suppressed his impulse.

"No, strictly follow the plan before takeoff."

He tried to make his voice sound serious:

"Regardless of whether the other party responds or not, return 17 miles away from the coastline and do not enter China's airspace."

The order he received on this trip was to give the Chinese people a command, so he was given a high degree of freedom of action.

But it definitely does not include actual invasion content.

While talking, the four-plane formation had flown about 40 kilometers northwest.

The airspace situation in front of us has also changed slightly.

"Captain, the opponent's two Flankers took a southerly turn and returned. They will pass our two o'clock direction in about 100 seconds, a distance of 115 miles...Should we slow down a little?"

Unit 03 suddenly reported.

Robinson lowered his head again and found that two Chinese targets had indeed deviated from the previous route and were turning to the right on a tight route.

But the distance of 115 miles is really too far.

Although the Self-Defense Forces have never had visual contact with Chinese aircraft, radar alone cannot confirm the Su-27SK and J-11B, two models with the same appearance but huge differences in radar performance.

But any existing fighter radar cannot detect its own front hemisphere at a distance of more than 180 kilometers.

In fact, the alarm system didn't even issue any reminder.

"No need for the time being. If the other party is just returning, the direction of the plane's nose will only scan us for a moment. Even if they turn on the radar, it is unlikely..."

However, before he finished speaking, he saw that the two Flankers did not continue to return to the west as they expected. Instead, after turning about 110°, they leveled off again and flew straight south.

At the same time, it was still accelerating and climbing, and soon exceeded the speed of sound at an altitude of about 9,500 meters.

This is obviously not the rhythm for preparing to return home.

"Squadron Captain, this..."

There was some urgency in Unit 03's tone——

If the current course continues, the two sides will not really face each other.

But the other party's unusual actions were not a good sign.

When unable to fire, if a third-generation aircraft is really approached within 20-30 kilometers, it may still be detected by the airborne radar, or even locked.

Robinson rechecked his surroundings and found no non-stealth friendly aircraft.

For a moment, he even thought that a group of F16s took off from the southeast to join in the fun, thus attracting the other party's attention.

But this idea is obviously unrealistic.

"Let's drop some altitude, move to the west, and avoid the radar in the northeast."

The colonel checked the fuel gauge and then ordered.

The F22 is not known for its range, and it is obviously impossible to carry auxiliary fuel tanks or carry out mid-air refueling in this kind of mission, so it is not willing to fly at low altitudes if possible.

But now, it is obviously not the time to care about the fuel consumption.

As he pushed the stick into a shallow dive, Robinson took another look at the radar screen.

An idea suddenly popped out of his mind——

"Fxxk, we...were not discovered?"