Under the starry sky, a transport plane was flying close to the peaks of the mountains.
In the cab, the faces of the crew members were all tense, with no expressions visible.
The transport crew of this transport plane also took great risks to perform this mission.
The navigation signal is intermittent.
Before departure, the superiors had clearly informed us that because the Beidou system was damaged, the flight could only rely on the old method - visual control and gyroscope.
Gyroscope was a flight navigation mode before the invention of satellite navigation.
Its invention and application are of epoch-making significance in the field of navigation. From the initial mechanical gyroscope, various high-precision products such as laser gyroscopes and fiber optic gyroscopes have been developed.
For an aircraft, multiple gyroscopes are generally configured at the same time, so that the aircraft's heading, speed, acceleration, and angular velocity can be continuously measured during the flight. Under the action of the timer, integral calculations can be performed to achieve flight
The trajectory of any point in the process relative to the take-off point can be effectively marked on the aeronautical chart to achieve navigation.
However, this navigation mode is very complex and has high requirements for pilots. Because of this method of navigation, two issues need to be paid attention to -
First of all, this kind of navigation is very dependent on the coordinates of the initial reference point, which is the coordinate parameters of the take-off point. This reference point must be determined in advance. If this reference point is wrong, everything will go wrong later.
Secondly, the process of navigation integral calculation is the process of error amplification. As time goes by or the voyage increases, the measurement errors in each link are constantly accumulated and amplified.
Therefore, the use of this kind of navigation system, especially long-distance long-distance flights, generally requires external correction measures, such as ground navigation radar radio correction, which relies on a series of navigation radars on the ground to measure the relative position of the aircraft from the radar base station at this time.
, and then sent to the aircraft to correct the trajectory of the aircraft.
This was the most mainstream navigation method for civil aviation before there was a satellite navigation system, that is, before the 1990s.
The other is ground reference objects or instructions from ground personnel. This method was mostly used in war years. For example, during World War II, when fighting deep behind enemy lines, it was necessary to rely on the navigator in the crew to constantly observe the ground reference objects and then make manual corrections against the aeronautical charts.
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This is why the crew is so nervous.
But compared to the members of the special operations squadron in the cabin, they were still too relaxed.
Those people are truly life-threatening.
"We are still less than thirty kilometers away from the airdrop point."
The navigator looked up from the laptop and turned to the driver.
"Did you check it clearly? Are you sure it's correct?" the driver asked.
The navigator nodded: "Well, I checked it three times to make sure it's OK."
The driver said: "Turn on the lights."
The co-pilot heard this and pressed the cabin light button.
Soon, the green light came on in the cabin of the transport plane.
In the cabin, the leader of the 270th Special Forces Squadron, Li Bing, raised his head and glanced at the lights on the bulkhead. He immediately stood up, turned around and gestured to everyone while shouting: "Get ready to parachute, check the parachute gear!"
In the huge cabin, the special forces on all seats stood up. Under the dim lights, according to the usual training rules, they checked each other's equipment, various instruments on their bodies, and then checked the oxygen supply system.
After that, hang up the weapon packs, line them up, and slowly move towards the rear of the cabin.
The cabin door slowly opened.
The icy air flow swept into the cabin, and Li Bing, who was standing at the edge of the cabin, could still feel the cold wind as sharp as a knife even with a mask on his face.
I glanced at the thermometer on my forearm, and the pointer pointed to more than forty degrees below zero.
It can be seen that the temperature outside the cabin will be lower.
This is 10,000 meters high in the sky.
What they were going to do this time was to jump high and fly low, using high-altitude air currents to glide southward to a landing site 60 kilometers away.
He stretched his head and looked out the cabin door. Under the moonlight, there were mountains covered with white snow everywhere. Even at night, he could still see the white light reflected from the snow.
Li Bing took a deep breath of cold air to calm his mind.
Although he is an experienced veteran, he couldn't help but feel a little nervous at this time.
He has jumped over 600 parachute jumps, over all kinds of terrains.
But like tonight's parachute jump, Li Bing was also an older girl getting into a sedan chair - her first time.
Because this is a death jump.
Because the Beidou system is currently damaged, the positioning and navigation signals are extremely unstable and almost intermittent.
The statement given by superiors is that Beidou will be restored in two days, but the statement is not certain.
The red, blue, and yellow sides have been at odds with each other in outer space these days. You destroy mine, and I destroy your satellite.
Both sides are trying every means to maintain the stability of their own navigation, and they are also trying every means to destroy the other side's navigation satellites.
The result is that sometimes there is a signal, sometimes not.
When it works, it may be that the satellite replenishment was successful. When the signal is lost, it may be that the satellite was destroyed by the other party again.
The actions of the 270 Special Forces are equivalent to wrestling with death.
At night, on complex terrain, there is no Beidou and no ground guidance.
All the necessary fatal conditions are in place.
However, military operations never depend on time, location, weather, or even conditions, but on fighter planes.
270 has all been dispatched. They were divided into several special operations squadrons and sent to the Guri Corridor and the seven northeastern states of White.
There is also a squadron that has been transferred, and its whereabouts are unknown. The operation is kept secret, and even the members of their own unit are not aware of it.
This shows how confidential the operation is.
beep--
The lights in the cabin suddenly changed.
The green light turned into a red light.
Li Bing stood by the hatch, reached out and patted the shoulder of the team member in front of him heavily - this was one of the guides.
All parachute guides have top-notch skills.
There were three guides for this parachute drop, one for each special operations platoon.
The guide's responsibility is to be responsible for positioning, just like the leading goose in a flock of wild geese.
If the leading goose flies to the wrong place, the other geese will also fly to the wrong place.
If the leader loses direction, it means that the entire platoon following him will fly in the wrong direction.
Doing so means failure of the action.
After patting him on the shoulder, he said nothing - in fact, no one could hear him clearly at this time.
The sound of the wind drowned out everything.
Li Bing gave the instructor a thumbs up.
This means asking if he is ready to skydive.
The conductor didn't say anything and gave Li Bing a thumbs up and smacked it twice in the air.
The answer is obvious - "Okay!"
Li Bing waved his hand forward and made a "jump" gesture.
The conductor dragged the heavy weapons bag to the cabin door and jumped down without hesitation. He quickly disappeared into the night outside the cabin, and only the IR light on the helmet was visible.
The special operations team members who followed jumped out one by one.
Li Bing patted everyone on the back one by one and watched them leave the cabin. Finally, when all the team members in the cabin jumped, he raised his head and raised his head towards the deputy captain who was also standing on the opposite side of the cabin urging the team members to parachute.
Thumbs up, then rushed out of the cabin door and jumped down.