To put it simply, aerial surveying and mapping in a general sense means moving the work performed on the ground into the air, continuously photographing the ground from a bird's-eye view to obtain data, and then drawing the geodetic coordinates based on the obtained data, which reflects the positional relationship of ground objects.
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It's obvious that military maps are not that simple.
Infantry troops commonly use large-scale maps with a scale of 1:50,000. The details of the information reflected on it are staggering to ordinary people. For example, a certain tree with a relatively identifiable location and a larger size is marked, or a piece of
Stones, and the positional relationship between them. For large-scale maps, a larger village is probably the main target area.
To draw such a map, it is definitely not possible to use the aerial surveying and mapping methods commonly used by civilians. Not only does it require high accuracy, but also the photos taken must be absolutely clear, and even a small mountain must be reflected.
In this way, just taking pictures is not enough.
The relevant electronic instruments carried in the surveying and mapping pod basically combine all the main functions of today's surveying and mapping tools, including maximum wide-angle and telephoto lenses with an error within five centimeters, radar surveying and laser altimetry scanning, and
The inertial measurement of the global positioning system also makes use of the function of mapping satellites to track and detect moving targets.
Fan Zengsheng said that four surveying and mapping pods are more expensive than one fighter plane.
The surveying and mapping team must not only conduct large-scale surveying and mapping, but also conduct precise surveying and mapping of certain areas. The latter must be more important. Li Zhan is not sure which department Lieutenant Colonel Lu belongs to, but he can clearly feel that despite his position
Not high but very scary. The answer is relatively obvious.
After entering the western area of the Beiku Mountains, Li Zhan entered a state of high alert. He adjusted the radar scanning mode to "Operation 2", which is a mode for simultaneous air and ground scanning. This batch of Su-27sk was in service with the Second Division.
There has been an improvement, mainly the replacement of the airborne radar, which is an improved model of the n001 radar. However, compared with the domestic large-diameter radar used by the J-11b, there is still a gap of three or four floors.
But at least it has a certain ground detection capability, and it also has a certain ground strike capability.
The visibility in this area is better, but because the terrain is more complex, more and more intense turbulent airflow is formed. Li Zhan is more worried about the low-altitude performance of the J-8fr. He had a deep experience of the beautiful man in the air while fighting floods in Sanhe.
Low-altitude performance for detecting garbage.
Zhu Wei was undoubtedly very familiar with it. After the visibility improved, Li Zhan could see that the No. 101 J-8FR had a stable air attitude and was flying very cautiously.
After climbing over a mountain ridge, we saw a scene that was completely different from the snowy Beiku area. Looking around, we could see lush green trees. Without the obstruction of clouds, the sun could shine on the earth. You could even see the roar of engines on the ground.
An unnamed bird that was so startled that it took flight.
Only separated by a mountain ridge, the east and west sides are like two seasons, and the east side is full of plateau mountains and barren soil, while the west side is green land and plains with fertile land.
"Yao Dong Yao, be careful to avoid birds." Li Zhan reminded Zhu Wei.
Zhu Wei replied, "Understood. I'm paying close attention to it. It's over."
At this time, the No. 101 J-8FR was in a low-altitude surveying and mapping state, only three to four hundred meters above the ground, so the chance of hitting a bird was absolutely high.
Li Zhan climbed a little higher and kept flying at medium and low altitudes. If there was a confrontation at this time, he would be the best detection target for ground radar. On the contrary, the No. 101 J-8fr would not be easily detected. The little prince with the lever was quite helpless. He had to
It is necessary to fly to cover Zhu Wei at this altitude.
"Yao Dong Yao, we are ready to turn west for high-altitude surveying and mapping. It's over." Li Zhan confirmed the position and reminded Zhu Wei.
Su-27sk No. 01 is also responsible for guiding the surveying and mapping route of No. 101 J-8fr, ensuring that the surveying and mapping fighter aircraft conducts surveying and mapping along the established route.
"Beep beep beep beep..."
The radar warning suddenly sounded without any warning beforehand. Those with poor heart endurance would probably be frightened to the point where their hands would shake, and the plane would shake as soon as it shook. Li Zhan had already been mentally prepared, so he was not frightened.
He quickly reported the situation to Zhu Wei, "Yao Dong Yao, I'm locked. It's the ground fire control radar. Execute the second plan, complete."
"Understood!" Zhu Wei accelerated, but did not change the flying altitude.
The second plan is that if Li Zhan, who is serving as a cover, is locked by the fire control radar, Zhu Wei will speed up the surveying and mapping. Even if he cannot achieve the expected accuracy, he must fly the entire surveying and mapping route, especially the curve in the western part of the mountain range.
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The tower issued the order as expected, "Good luck! The air force has conducted a surprise inspection and asked our fighter planes that are performing training missions to simulate an air encounter. The enemy situation is set to intercept you with the assistance of ground air defense positions.
Wish you good luck, it’s over!”
Sure enough, it came.
Li Zhan shook his head helplessly, "Good luck receiving it!"
The use of the call sign "Good Luck" means that the temporary drill to be performed next is a red-blue confrontation test against the 101st Brigade Falcon Brigade. At this time, the role of the Falcon Brigade is to simulate the Blue Army, which means that the opponent must be a simulated Red Army.
All other missions use the radio call sign "01". After all, this is the officially compiled call sign.
"Tower, let me ask, I was locked by the radar. Is it a simulation of the Red Army? Are you done?" Li Zhan asked.
Xue Xiangdong answered simply, "The confrontation has begun, I can't say, good luck and good luck."
I wish your sister good luck. The flight commander really knows how to choose the time and the place. There is not even a mountain that can be used in this flat plain. Am I not just a target for the Red Army?
I feel helpless, but I still need to create conditions.
What didn't surprise Li Zhan was that he had been locked for more than a minute, but the simulated Red Army had not yet attacked him. This reaction speed was really expected.
The fire control radar locked onto the target for two or three minutes and the missile failed to fire out. This simulation of the Red Army was enough to give face, knowing that we, Lao Li, did not have the terrain advantage to let go.
Li Zhan performed an escape maneuver in accordance with standard procedures and scanned the ground in a focused manner, but it was useless. It was difficult for the airborne radar to separate the target from the complex terrain background.
Looking at the position of No. 101 J-8FR, Li Zhan quickly calculated the time required to complete this section of mapping based on its speed, and entered a countdown of three minutes on the screen. He had to hold on for at least three minutes to cover Zhu Wei.
Complete the surveying and mapping of this section. Otherwise, the commander will judge him as a failure in the confrontation.
It is obviously not that simple for the air commander to carry out a surprise inspection at this time. What needs to be tested is the ability of your falcon brigade to respond if it encounters the enemy under the current actual situation.
A typical encounter.
This means that there will be simulated Red Army fighter planes to intercept.
After Li Zhan completed his evasive maneuvers and got rid of the lock, he turned around again and flew westward, then followed the No. 101 J-8fr and turned south. There was no suspense that he was locked again. This was an involuntary helplessness, and he couldn't help it.
If you rush forward, the simulated Red Army will focus on Zhu Wei. If Zhu Wei is "shot down", he will fail.
The purpose of escort is to protect your own aircraft from threats, whether you take the initiative to shoot down the enemy aircraft or rush to take missiles for the protected own aircraft.
This limits the performance of escort fighters, and they cannot use all their air combat skills as they wish without worries.
Many strings of fast flames emerged from the ground, rising rapidly and heading straight towards them.
Li Zhan turned on the afterburner after reaching the bottom of the throttle lever. The two al-31f engines burst out with powerful thrust. The fighter jet ran forward with full energy. Li Zhan gained more energy in a very short time by pressing the lever and diving.
Then continue to roll the barrel to avoid.
Unguided anti-aircraft shells obviously hardly pose a threat to him, of course they are simulated shells.
The radar warning kept blaring. Li Zhan knew that this time the simulated Red Army would have time to launch surface-to-air missiles, so he did not dare to underestimate it. He continued to dive until he reached a height of about 300 meters above the ground before leveling the fighter plane. Radar warning
The chirping of the device suddenly disappeared.
Li Zhan secretly breathed a sigh of relief. This showed that the low-altitude detection blind zone of the simulated Red Army fire control radar was below 300 meters.
"Yao Dong Yao, the height of 300 meters is the safety line, it's over!" Li Zhan reminded Zhu Wei.
Zhu Wei replied, "Yao Dong Yao understands! Hold on for one more minute and it's over!"
Without any hesitation, Li Zhan drove up with afterburners close to a forest at ultra-low altitude. He had already found a location. This forest was relatively flat and very suitable for ultra-low altitude acceleration and flying to supersonic speeds. He wanted to
Quickly gain speed to make the next move.
After estimating the height of the ground, Li Zhan descended some heights. It looked like the belly of the aircraft was touching the treetops, and he used the heavy air superiority fighters on both sides as "treetop killer" armed helicopters.
Su-27sk No. 01 quickly broke through the sound barrier, and the brutal noise rushed to the ground like shock waves. The soldiers who simulated the Red Army on the ground covered their ears and opened their mouths in discomfort, and all the windows of the barracks nearby were blown away.
Their gunners held their hearts in pain and controlled the anti-aircraft guns to aim at the sky but could not see anything, because before the noise came, an afterimage flashed past their heads...
After breaking the sound barrier, Li Zhan immediately pulled the stick and climbed vertically, with the nose of the plane pointing straight into the sky. Even with two air-to-air missiles and two rocket launchers mounted, it could still fly at supersonic speeds in such a short period of time, proving that
The Su-27 series fighters are indeed world-class fighters. After all, the thrust-to-weight ratio of the fighters is there.
"Beep beep beep beep..."
The radar warning sounded again, but Li Zhan discovered that his airborne radar had scanned the target. This time, it was not the fire control radar of the ground air defense position that locked onto him, but the target from the air.
Li Zhan quickly judged from the radar beam reflection characteristics that the one coming from the right wing and targeting him was a dual-engine, two-seater heavy air superiority fighter model simulated by the Red Army that had better maneuverability than the su-27sk and stronger air combat capabilities.