In a general sense, aerial surveying and mapping is simply to move the work carried out on the ground to the air, and continuously shoot the ground from a top-down angle to obtain data, so as to draw geodetic coordinates according to the obtained data, reflecting the position relationship of ground objects.

Obviously, military maps are not so simple.

Infantry units often use maps with a scale of 1:50,000, and the details of the information reflected on them are astonishing. For example, mark a relatively recognizable and larger tree, or a rock, and the relationship between them. For large-scale maps, a large village is probably the main target area.

In order to draw such a map, it is certainly not possible to adopt the aerial surveying and mapping methods commonly used by the people. Not only is it required to be precise, but it is also required that the photos taken must be absolutely clear, and even a small mountain bag must be reflected.

In this way, shooting alone is not enough.

The relevant electronic instruments carried in the surveying and mapping pod basically integrate all the main functions of today's surveying and mapping tools, including the maximum wide-angle and telephoto lenses with an error of less than five centimeters, both radar surveying and mapping, laser altimetry and scanning, both global positioning system inertial measurement, and the use of surveying and mapping satellites to track and detect moving targets.

Fan Zengsheng said that four mapping pods are more expensive than one fighter.

The surveying and mapping team has to carry out both large-scale surveying and mapping of certain areas, and the latter must be more important. Li Zhan, who is Lieutenant Colonel Lu, is not clear now, but he can clearly feel that although his position is not high, he is very feared. The answer is more obvious.

After entering the western region of the Beiku Mountains, Li Zhan entered a state of high vigilance. He changed the radar scanning mode to "Combat II," which is a simultaneous air-to-ground scanning mode. This batch of SU-27SK has been improved once during the service of the second division, mainly to replace the airborne radar, which is an improved model of the N001 radar, but there is still a big gap of three or four stories compared with the domestic large-caliber radar used by the J-11B.

However, if you have a certain amount of ground detection capability, you will have a certain amount of ground strike capability.

Visibility in this area is better, but because the terrain is more complex, there are more and more intense turbulent currents. Li Zhan was more worried about the low-altitude performance of the J-8FR, and he had deeply learned the low-altitude performance of the beautiful man in the air and the garbage detective in the Sanhe flood control at that time.

Zhu Wei is undoubtedly very familiar with it, and after the visibility improves, Li Zhan can see that the air attitude of the No. 101 J-8FR is very stable and flying very cautiously.

Turning over a mountain beam, there is a scene completely different from the snow-capped Beiku area - as far as the eye can see, the trees are green and green, the sun is not blocked by clouds, and the sun can shine on the earth, and even unnamed birds can be seen on the ground startled by the roar of engines.

Separated by only a mountain beam, the east and west sides are like two seasons, and the east side is full of plateau and mountain soil is barren, and the west side is green plain and fertile land.

"Be careful to avoid birds." Li Zhan reminded Zhu Wei.

Zhu Wei replied, "I understand, I'm highly concerned, over." ”

At this time, the No. 101 J-8FR is in a low-altitude mapping state, only three or four hundred meters from the ground, and the probability of hitting a bird is absolutely relatively large.

Li Zhan rose a little to a certain altitude and kept flying at a low and medium altitude. At this time, if it is a confrontation, he is the best detection target for ground radar, but the No. 101 J-8FR is not easy to detect. The little prince of the lever was quite helpless, he had to fly at this altitude to cover Zhu Wei.

"I'm ready to turn west for high-altitude mapping, over." Li Zhan confirmed the location and reminded Zhu Wei.

The No. 01 SU-27SK is also responsible for guiding the mapping route of the No. 101 J-8FR to ensure that the mapping fighters are surveying along the established route.

"Toot Toot Toot Toot ......"

The radar siren sounded suddenly, without the slightest warning. It is estimated that the heart can almost withstand it will be so frightened that its hands will tremble, and the plane will tremble as soon as it shakes. Li Zhan had already been mentally prepared, so he was not frightened.

He quickly reported the situation to Zhu Wei, "I am locked, it is the ground fire control radar, and the second set of plans is implemented, and it is over." ”

"Understood!" Zhu Wei accelerated, but did not change the flight altitude.

The second plan is that if Li Zhan, who is in charge of the cover mission, is locked by the fire control radar, Zhu Wei will speed up the surveying and mapping, and even if he cannot achieve the expected accuracy, he will fly the entire mapping route, especially the curve of this section of the western part of the mountain range.

The tower unsurprisingly ordered, "Good luck!" The air division has made a surprise spot check, and asked the fighters of our department who are carrying out training tasks to simulate an air encounter, and the enemy situation is set up to intercept you with the assistance of the ground air defense position. ”

Sure enough, it came.

Li Zhan shook his head helplessly, "Good luck to receive!" ”

The use of the call sign "Good luck coming" means that the next temporary exercise to be carried out is the red and blue confrontation test for the 101 Brigade Eagle Brigade, at this time the role of the Eagle 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 regular call sign.

"Tower, let me ask, I'm locked by the radar, it's a simulation of the Red Army, right?" Li Zhan asked.

Xue Xiangdong replied very simply, "The confrontation has begun, I can't say, good luck comes, I wish it well." ”

I wish your sister a smooth trip, the air division will really pick the time, and the place will be picked. There is not even a mountain that can be used here, so am I not the target of the simulated Red Army?

I am helpless in my heart, but I also have to create conditions.

To Li Zhan's surprise, he had been locked for more than a minute, but the simulated Red Army had not yet attacked him. The speed of the reaction was really expected.

The fire control radar locked on to the target for two or three minutes, and the missile failed to shoot out, which simulated the Red Army and was enough to save face.

Li Zhan did the maneuver according to the standard procedure, and by the way, he focused on scanning the ground, but there was no indiscriminate use, and it was difficult for the airborne radar to sneak the target out of the complex terrain background.

Looking at the position of the No. 101 J-8FR, Li Zhan quickly calculated the time required to complete the mapping of this section according to 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 to complete the mapping of this section. Otherwise, the air division will also judge him to lose the confrontation.

At this time, it is obviously not so simple for the air division to surprise and spot check, and what you have to test is the ability of your Eagle Falcon Brigade to deal with the enemy if it encounters the enemy in the current actual situation.

Typical encounters.

It means that there will be fighters simulating the Red Army to intercept them.

After Li Zhan completed the evasion maneuver and got rid of the lock, he turned around again and flew back to the west, and then followed the No. 101 J-8FR to turn south. Without any suspense, he was locked again. This is involuntary helplessness, if he does not rush forward, the simulated Red Army will focus on Zhu Wei, and if Zhu Wei is "shot down", he will fail.

The purpose of an escort is to protect your aircraft from threats, whether you take the initiative to shoot down enemy aircraft or rush over to take missiles for your protected aircraft.

This restricts the use of escort fighters, and they are unable to give full play to their air combat skills as they wish.

A number of fast-moving fires erupted from the ground, quickly rising and heading straight for them.

Li Zhan's throttle lever turned on the afterburner, and the two AL-31F engines burst out with powerful thrust, and the fighter rushed forward with full energy, and Li Zhan's pressure lever dive was able to obtain more energy in a very short time, and then continuously rolled the barrel to avoid.

Unguided anti-aircraft shells are clearly difficult to pose a threat to him, of course, they are analogues.

The radar alarm kept beeping, and Li Zhan knew that this time the simulated Red Army would have time to launch ground-to-air missiles, so he didn't dare to underestimate it. He continued to dive until he reached an altitude of about 300 meters above the ground before leveling the fighter. The chirp of the radar siren disappeared all at once.

Li Zhan secretly breathed a sigh of relief, which showed that the low-altitude detection blind spot of the fire control radar simulating the Red Army was below 300 meters.

"Hole, three hundred meters high is the safety line, over!" Li Zhan reminded Zhu Wei.

Zhu Wei replied, "I understand!" Hold on for one more minute and you're done! ”

Li Zhan did not hesitate at all, and drove up with afterburner at an ultra-low altitude against a forest, he had already found a location, this forest was relatively flat, and it was very suitable for ultra-low-altitude acceleration flight until supersonic speed. He has to gain speed quickly to make the next move.

After estimating the height of the ground, Li Zhan lowered it some more, and it seemed that the belly of the plane was about to stick to the treetops, and he used the heavy air superiority fighters of both sides as "treetop killer" gunships.

SU-27SK No. 01 quickly broke through the sound barrier, and the brutal sound noise rushed to the ground like a shockwave. The soldiers on the ground simulated the Red Army so uncomfortable that they covered their ears and opened their mouths widely, and all the barracks glass on the side were blown up, and their gunners held their uncomfortable hearts and manipulated the anti-aircraft guns to aim at the sky but could not see anything, because before the sound came, an afterimage had already flashed over their heads......

After breaking the sound barrier, Li Zhan immediately pulled the rod and climbed vertically, and the nose of the plane pierced the sky. The fact that the SU-27 series fighters are indeed world-class fighters can still fly at supersonic speeds in such a short period of time with two air-to-air missiles and two rocket launchers on board. After all, the thrust-to-weight ratio of the fighter is there.

"Toot Toot Toot Toot ......"

The radar alarm sounded again, but Li Zhan found that his airborne radar had scanned the target, and 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 through the radar beam reflection characteristics that the twin-engine two-seat heavy air fighter that killed him from the right flank and locked on to him simulated the Red Army, with better maneuverability than the SU-27SK and stronger air combat combat capabilities.

"Damn, Su 30 MKI!"