After making a decision, Bai Huawei did not delay and asked Liu Zunling to arrange it.

In fact, it is to use satellite communication radios to contact the rear, so that the Air Force can immediately take action and arrange for bombers to deal with the landing fleet left near the transit island.

Fortunately, it was a very short command.

When developing communications satellites, the Imperial military valued secrecy the most, including the electromagnetic radiation generated when sending and receiving messages.

To put it bluntly, you have to try to reduce the intensity of radiation, preferably without electromagnetic radiation.

For this reason, for a long period of time, the imperial military pinned their hopes on laser communication technology, that is, the laser has excellent directivity.

In addition, the communication efficiency of lasers is far greater than that of radio.

At that time, it seemed that laser communication was very promising and had a tendency to replace radio stations.

In fact, it was in the field of communications that research trained a large number of professionals and laid a solid foundation for the later development of laser weapons.

Unfortunately, the application of lasers in the field of communication has not been so smooth.

Compared with radio communication equipment, laser communication equipment has both outstanding advantages and disadvantages that cannot be concealed, such as being highly susceptible to weather influences. In the atmosphere, the signal strength decreases rapidly, making it suitable for short-range communications, not long-distance communications.

This characteristic is very evident in a secret project of the Military Intelligence Agency.

Eight years ago, the Military Intelligence Agency purchased a state-of-the-art supercomputer to analyze and process intelligence information. It's a pity that there is no place to install this supercomputer at the headquarters of the Military Intelligence Agency, and the environment is not very good. As a result, the MIA built a building on the outskirts of headquarters, near the National Forest Park, about 30 kilometers from its headquarters, to house the supercomputer.

Now, communication becomes a big problem.

Although it is possible to lay cables, the delay caused by wired communication is too large, which will reduce the efficiency of the computer, and a faster communication system is required.

It is in this context that laser communication technology has gained the opportunity to perform.

Funding from the Military Intelligence Agency was to build a tall tower at the headquarters and a computing center to house laser communications equipment. Because the laser propagates in a straight line, the military intelligence agency also buys land near the communication line through relevant agencies to ensure that there are no tall buildings blocking the light path.

It must be admitted that the transmission speed of laser communication equipment is really fast, several orders of magnitude higher than that of radio communication equipment.

In a test conducted by the Military Intelligence Agency, the laser communication equipment sent 10 GB of data information in just one second, while the data radio of the same period did not even have 10 MB. For example, the No. 15 data link, which is common to the three armies of the empire, can only send 1MB of data per second under ideal conditions, while the No. 16 data link, which is under development and has not yet been officially equipped, only reaches 10MB per second.

It's just that the shortcomings of laser communication are also prominent.

In addition to being able to transmit point-to-point straight, it is highly susceptible to weather influences, and the signal strength decreases rapidly.

In fact, this system has only been working for 3 years.

It's not that there is more advanced communication technology, but the production process of optical fiber has been solved and can be mass-produced.

Affected by all these factors, laser communication technology was not considered when developing military communication satellites.

If anything, the Imperial Air Force did a not very successful test. A laser communication satellite was launched, and the test results showed that in order to obtain a good enough signal strength, the satellite can only be deployed in low-earth orbit, and hundreds of satellites are required to network to cover the whole world.

Obviously, the cost of networking alone is unaffordable.

In addition, satellites in low-earth orbit are vulnerable to attack and will certainly not be reliable in a global war.

It was after these attempts that the Imperial Military temporarily abandoned laser communication technology and shifted its focus to radio communication technology.

Compared with laser communication technology, radio communication not only does not transmit information fast enough, but also generates electromagnetic radiation.

It is precisely for this reason that many fleet commanders do not like to take the initiative to contact the rear.

Although after decades of development, the most advanced agile radio station has produced very weak radiation when working, and can change its own signal characteristics through frequency hopping, reducing the probability of being discovered and intercepted by the enemy, but theoretically, the radio signal that can be received by one's own communication satellite, the enemy's communication satellite can also receive, even if there is no way to crack it, it can also measure the approximate location of the signal source.

If anything, it is not an uncommon thing to spy on the military communication satellites of hostile countries, especially the main ones.

All along, the Imperial Air Force has been monitoring the communications satellites of the Nuland Republic and the Empire, especially the large military communications satellites in geosynchronous orbit.

These satellites tend to operate in orbit for more than 10 years, and are mainly used to receive and relay important information.

The key point is that the geosynchronous orbit is 36,000 kilometers above the ground, which exceeds the launch height of all land-based, sea-based and air-based anti-satellite weapons.

Obviously, geosynchronous orbit is the safest and an ideal location for the deployment of communications satellites.

Theoretically, only three geosynchronous communications satellites are needed to cover the area except the North and South Poles, which is equivalent to 80% of the Earth's surface area.

In fact, no one went to the South Pole or the North Pole to fight.

In order to strengthen surveillance, a separate set of signal receiving equipment is installed on the third-generation geosynchronous communications satellites to measure the general direction of the intercepted radio signals. The point is that the Imperial Air Force has been adopting a strategy of following the deployment closely, that is, deploying a communications satellite of its own in geosynchronous orbit near the communications satellites of the Nuland Republic and the Empire, and the deployment distance is getting closer and closer.

So far, the distance is less than 100 kilometers!

For satellites flying at tens of thousands of kilometers per hour, this is a distance within reach.

In order to avoid unnecessary troubles, such as small frictions leading to large-scale wars, the International Space Organization (ISO) was jointly initiated by the Liangxia Empire, the Juman Empire and the Nuland Republic, and its main functions include allocating orbital resources and ensuring that all countries have the right to use outer space.

This time, the signal was forwarded through a communications satellite deployed in geosynchronous orbit.

A very short telegram, known as the "Battle of North Khowai", began the first large-scale naval battle in the Guia Theater of World War III.

When giving the order, Bai Huawei definitely did not expect that the Air Force would be so proactive.

As early as the afternoon of the 12th local time, that is, on the evening of the 12th on Bai Huawei's side, 40 "H-9Ds" deployed in the North Malaysia Islands, to be precise, the Saidao Air Base, were lifted into the air, and all of these bombers were equipped with 24 heavy anti-ship missiles.

That's right, it's KD-30B.

This heavy anti-ship missile was independently invested and developed by the Navy, and the basic type is an air-launched cruise missile that can be carried by the "Attack-12".

However, in the process of development, we encountered great trouble, mainly because the performance indicators set by the navy were too high.

For example, the quality control should be within 1000 kg, reach a range of 1500 km, and the quality of the warhead should preferably reach 500 kg, at least not less than 250 kg, and later add stealth requirements, as well as the ability to replan the mission during the flight.

Obviously, it is very difficult to solve the contradiction of just the mass with the range.

What's even worse is that it has to be stuffed into the bomb bay of the "Attack-12", and it can carry at least two.

As a result, the KD-30 was developed for almost ten years, but it has never been able to pass the acceptance of the Navy, or it has not met the performance indicators proposed by the Navy at all.

As the "Attack-12" project entered the prototype flight test stage, the Navy also had to retreat to the next best thing.

In fact, that is, to reduce the performance indicators and give priority to the development of air-launched anti-ship types that do not have high performance requirements.

As a result, the air-launched anti-ship version was developed first, that is, it passed the test acceptance.

If anything, the point is that the anti-ship type really does not need a long range.

Although there is no difficulty in developing an anti-ship missile with a range of 1,000 kilometers or even 1,500 kilometers, and there are no technical obstacles, in actual combat use, it does not mean that the longer the range, the better, and how far is the best is also affected by other factors.

To put it simply, it is actually the time it takes for an anti-ship missile to hit the target from launch.

For example, the KD-30B is equipped with a dual-mode seeker with active radar and infrared imaging, and even under ideal conditions, the detection range of large warships is only 40 kilometers. Because an ideal situation is unlikely, in real combat, the active search range of anti-ship missiles will definitely be smaller. This means that if the enemy ship travels more than 40 kilometers before the anti-ship missile arrives, then the KD-30B is likely to miss the target. Normally, the speed of a warship in a combat state is about 30 knots, and even if it is calculated according to 30 knots, it will take about 45 minutes to sail 40 kilometers, and this time determines the range of anti-ship missiles.

For a subsonic anti-ship missile, it can fly about 600 kilometers in 45 minutes.

It is precisely this that the maximum range of the KD-30B is only 650 km.

Obviously, this range is not too far, but it is enough.

To say, the Imperial Navy has not paid much attention to supersonic anti-ship missiles, the main thing is that supersonic anti-ship missiles are too bulky.

If other performance indicators are the same, just increase the speed to Mach 3, and the mass will be increased by more than 2 times!

Obviously, an anti-ship missile weighing 3 tons not only cannot be mounted by a tactical aircraft, but even if it is deployed on a warship, it will take up a lot of space.

The key is that no matter how good the supersonic anti-ship missile is, the combat effectiveness cannot reach 3 times that of the subsonic anti-ship missile.

Even if the price of supersonic anti-ship missiles does not reach 3 times that of subsonic anti-ship missiles, the cost-effectiveness ratio may not be very bad, but in a large-scale war that requires the use of supersonic anti-ship missiles, especially in a global war, the last thing to consider is actually the cost-effectiveness ratio.

No matter how expensive the missile is, it is cheaper than the enemy's warship.

In a small-scale war that requires consideration of the cost-effectiveness ratio, subsonic anti-ship missiles are also competent, and their combat efficiency is not much lower than that of supersonic anti-ship missiles.

As for the theoretical ability to get a longer range, it is only theoretically.

To put it simply, an anti-ship missile with 3 times the speed of sound theoretically has a maximum range of 3 times that of high subsonic, that is, it can reach 1,800 kilometers. The problem is that to get this range, the mass will be close to 10 tons, and even with the latest technologies, such as lighter composites, it will not be able to fall to less than 8 tons. It's so bulky that not only can't be carried by tactical platforms, but it's also going to be very expensive.

In fact, the Imperial Navy has long done arguments and research in this regard.

In the end, it was concluded that in the existing technical conditions, a flying supersonic anti-ship missile is not the best option. Even if it is possible to solve the problem of guidance and make the hit rate meet the targets proposed by the Navy, there is a more ideal, or more cost-effective option.

For example, ballistic missiles are used as vehicles to directly deliver anti-ship warheads thousands of kilometers away.

It is a pity that due to various factors, the study of the Navy ended here.

The main reason is that at the time of the relevant demonstrations, the Navy did not have ballistic missiles available, and it did not have the priority to develop ballistic missiles. If it is proposed that ballistic missiles can be used to carry out anti-ship missions, the Air Force and Army will certainly pounce and snatch the projects belonging to the Navy.

However, there are also technical difficulties that are difficult to solve.

It is precisely in this way that the Western Continent group did its best to develop supersonic anti-ship missiles, and even the Republic of Nuland did something, and the Imperial Navy still insisted on using subsonic anti-ship missiles.

However, the KD-30B is no ordinary anti-ship missile.

This is a stealth anti-ship missile!

As mentioned earlier, the most serious problem facing the Imperial Navy is not how to take out the enemy's warships, but how to keep their own warships.

In other words, that is, the interception of anti-ship missiles.

When studying how to intercept anti-ship missiles, the Imperial Navy discovered a very important problem.

Comparatively speaking, the difficulty of timely detection of anti-ship missiles is much greater than the difficulty of intercepting anti-ship missiles. In other words, as long as the incoming anti-ship missiles can be detected in a timely manner, they can generally be successfully intercepted by relying on the existing air defense system, and a relatively ideal interception probability can be achieved by appropriately improving the air defense system.

It is precisely for this reason that the Imperial Navy invested heavily in the development of phased array radars for use in the "Qingzhou" class.

It's just that this discovery also made the Imperial Navy realize. Reducing the signal characteristics of anti-ship missiles, that is, reducing the probability of being discovered, can also improve the penetration efficiency and reach a relatively ideal level.

This is the theoretical basis for the development of stealth anti-ship missiles.

Actually, this truth is not difficult to understand. Unfortunately, not everyone felt the need for this.

The reason is also very simple, compared with warships, even fighters, the target characteristics of anti-ship missiles are very weak, and they themselves have strong concealment. For example, the RCS value of an anti-ship missile of the AGM-84 "Harpoon" class generally does not exceed 0.1 square meters, while the RCS value of the A-7 light attack aircraft exceeds 20 square meters, and the RCS value of the F-14B heavy fighter is about 50 square meters.

It's just that in the face of increasingly advanced air defense systems, the signal signature of anti-ship missiles is already obvious enough.

Then, theoretically, reducing the RCS value by several orders of magnitude will inevitably increase the penetration efficiency of anti-ship missiles.

As for whether this theory is correct or not, it will soon be concluded.