The chicken blood on the Internet has started to fight again! In the past few days, I don't know where it came out, saying that our Chang'e-6 lunar probe reached a speed of "Mach 31" when it returned from the moon and re-entered the earth's atmosphere.
Some bloggers have taken the trouble to say that if this "Mach 31" is replaced by an ICBM, then no US missile defense system will be able to intercept it, in short, it is one word "awesome"! What's more, Chang'e-6 was linked to Geng Shuang, the mainland's deputy permanent representative to the United Nations......
In addition, there is also news that the return trajectory of Chang'e-6 is the so-called "Qian Xuesen ballistic", in other words, this is a super-large hypersonic vehicle returning from the moon, if used in other fields, it is simply invincible.
At the same time, news about a certain type of electronic reconnaissance ship of the Chinese Navy has also been circulating on the Internet, with one moment saying that a certain type of electronic reconnaissance ship of the Chinese Navy successfully interfered with the daily communications of all participating ships during the US Rim of the Pacific military exercise, and at another time saying that all GPS signals on Luzon Island in the Philippines had been interfered with in the past two days, and that it was also the work of the Chinese Navy's reconnaissance ship.
News of the recent withdrawal of the U.S. Army's Intermediate-Range Capability Company (MRC) from the Philippine Islands was linked to news of the activities of Chinese Navy reconnaissance ships and "jamming" of the GPS signal on Luzon.
▲The Typhon medium-range missile system previously deployed to the Philippines
Needless to say, the success has created an invincible atmosphere for us, not only is it admired on the Internet, but since it is so popular on the Internet this time, and even in reality, colleagues have come to ask, so we really have to write an article to talk about these two things.
Whether it's the so-called Chang'e-6 re-entry at Mach 31, or the Chinese Navy's interference with the Rim of the Pacific exercise, the interference with the GPS signal of Luzon, and the scare off the U.S. Army's 1st Multi-Domain Warfare Task Force Intermediate-Range Strike Company (MRC), our view is very clear: it's all fake news, nothing is true, and it's the kind of fake news that has no common sense to speak of.
Mach 31's Chang'e-6
The first is that the so-called Chang'e-6 re-entered the atmosphere at a speed of Mach 31, and it is obvious that the bloggers who made up this statement do not understand the concept of the speed of the space vehicle and the speed of the Mach number.
What is the Mach number, the Mach number is a data used to describe the ratio of the airspeed and the speed of sound of an object in a continuous flow environment, that is to say, its comparison premise is that in the atmosphere, sound can travel, and the motion of the object under this premise is in line with the concept of Mach number.
At the same time, due to the different speed of sound propagation at different air densities, the Mach number is also different at different altitudes, for example, the speed of sound at sea level is 340 m/s, but the speed of sound at 10,000 meters is only 295 m/s, so the same true velocity, the Mach number is also different.
But in any case, we want to emphasize that the Mach number is a concept used for aerodynamics, and after spaceflight leaves the atmosphere, it is out of the field of aerodynamics and belongs to the field of astronautics, and there is no air in outer space. Therefore, the concept of Mach is not suitable for describing the return of Chang'e-6, and it is enough to describe the speed of the spacecraft in simple kilometers per second.
First of all, the blogger who re-entered the atmosphere at the so-called "Mach 31" may have seen the official report that the re-entry speed of Chang'e-6 was 10.5 km/s, so simply except for the sea level airspeed, the figure of Mach 31 was obtained.
In fact, even from the perspective of Chang'e-6's reentry speed, the reentry speed of 10.5 km/s is not the fastest speed, and the fastest human re-entry speed should be 39,897 kilometers per hour, or about 11.08 km/s, during the Apollo 10 mission in May 1969.
▲The second cosmic velocity reached 11.2 kilometers per second
In fact, all the vehicles returning from the moon in human history have a speed of more than 10 km/s, and we have already reached this data when Chang'e-5 returned to Earth. I don't know why, now that Chang'e-6 has returned to Earth, it has been taken out again, and a boring "Mach 31" that can't be played with the eight poles of space flight has been added, anyway, I didn't understand the meaning of this operation.
Of course, whether it is 10.5 km/s or 11.08 km/s, this speed cannot directly re-enter the earth's atmosphere, the re-entry speed is too fast, and no heat-proof tile can block such a large aerodynamic heating, the spacecraft will burn up directly in the atmosphere like a meteor, and only the wreckage will be left when it falls into the lower atmosphere.
Therefore, both the American Apollo spacecraft and the Chinese Chang'e spacecraft must implement reentry deceleration when returning from the moon. This re-entry method is called semi-ballistic re-entry, and the current semi-ballistic re-entry method is divided into two types: lift re-entry and jump re-entry:
Lift reentry means that after the spacecraft enters the Earth's upper atmosphere, it uses the characteristics of the spacecraft's own lifting body to extend the gliding distance in the upper atmosphere and reduce the speed to an acceptable range, and then enters the lower atmosphere. For example, the typical space shuttle orbiter re-entry uses a lift-type re-entry, and the American Apollo spacecraft re-entry, several of which also use a lift-type re-entry.
After the re-entry capsule re-enters the upper atmosphere, the aerodynamic control of the re-entry capsule in the upper atmosphere is used to "float" and bounce back into outer space, and then re-enter the space for a second time, using this "water drifting" space to slow down the spacecraft, which is also the re-entry method used by Chang'e-5 and Chang'e-6.
Compared with lift-based reentry, jump reentry requires higher control accuracy, but it is not a unique reentry method in China, and the Apollo spacecraft of the United States has also used the jump reentry method in several of its missions, which has also been successful.
At the same time, it is worth noting that whether it is a lifting reentry or a jumping reentry, in essence, it has nothing to do with Qian Xuesen's ballistics! Qian Xuesen's ballistics, as we described before, is a kind of gliding trajectory that uses rocket engine boost and the high lift-to-drag ratio characteristics of the lifting body in the near space to carry out gliding flight, which can also be called a semi-ballistic flight.
However, it is different from the applicable altitude layer of spacecraft reentry, and does not have the orbital characteristics of entering the upper atmosphere - rebound reentry that jump reentry has, so the trajectory of Chang'e-6 when it returns to Earth has nothing to do with Qian Xuesen's trajectory, and it is not original.
So all in all, when Chang'e-6 returned to Earth, there was no so-called Mach 31 re-entry, nor did it use Qian Xuesen's ballistic re-entry, its re-entry level was very high, but it had nothing to do with Mach number and Qian Xuesen's ballistics. Not to mention, Chang'e-6 is a manifestation of the mainland's peaceful use of space, and some people have to associate it with military activities, and they don't know what their intentions are.
Electronic warfare scares away the US military
After talking about Chang'e-6, let's go back and talk about the so-called Chinese Navy reconnaissance ship interfering with the Rim of the Pacific military exercise, interfering with the Philippine GPS, and scaring the medium-range capability company (MRC) of the US military's First Multi-Domain Warfare Task Force (MDTF-1) into a panic.
In fact, these are all things that can't be beaten. Due to the extremely high level of the Chinese Navy reconnaissance ship, we really don't know much information, but what can be said is that this kind of naval reconnaissance ship is mainly responsible for SIGINT class tasks.
What is SIGINT? This is a relatively large category of electronic reconnaissance, including communications intelligence (COMINT), electronic reconnaissance intelligence (ELINT), measurement and characteristic intelligence (MASINT), and so on; communication intelligence is the intelligence that listens to and monitors the enemy's communications; electronic reconnaissance intelligence refers to the intelligence obtained by monitoring the enemy's radio frequency signal source, and measurement and characteristic intelligence mainly refers to the information obtained by distinguishing the type and nature of the enemy's electromagnetic radio frequency.
However, no matter what kind of intelligence it is, it is mainly based on passive collection of information and surveillance, and only when the opponent is not sure whether he has been spied on or not can he obtain the greatest reconnaissance effect. For such an electronic reconnaissance ship, silence is the greatest lethality.
What's more, now is not a time of war, how can we take the initiative to interfere with other people's communications, or even insert our own gossip into other people's communications, isn't this a clear way to tell people that I am listening to you? If you think about it a little deeper, people may use the fact that you have been spied on to push back your possible monitoring strategy and make corresponding technical improvements, which will bring trouble to our follow-up work.
Therefore, it is impossible for the Navy's reconnaissance ships to take the initiative to talk about things in other people's communication channels, not to mention that the 2024 Rim of the Pacific military exercise has not started at all, and this news is true or false.
The so-called Chinese Navy reconnaissance ship interfered with the GPS signal of the Philippines, scared the MDTF-1 to pee, naturally it is all gone, there is no foreign media to report this news, in fact, active electronic jamming and passive electronic reconnaissance, this is not the same thing at all, some people confuse it again.
As for the U.S. military's First Multi-Domain Warfare Task Force (MDTF-1), people were originally deployed in a mobile manner, emphasizing rapid maneuvering within the first and second island chains, and now that the Shoulder to Shoulder 2024 exercise has ended, it is natural that the girl should retreat, and I don't know how it is connected with the so-called Luzon GPS jamming, which is too bloody.
In general, our current strength is indeed up, but the stronger we are, the more we must maintain a modest and cautious style, not arrogant and impatient, because there are many shortcomings in our country. The stronger our strength is, the more cautious we must use our strength to ensure that our national strength is used where it should be used most and at the moment when it should be used the most.