"But boss, we will soon succeed." Barn said helplessly.

"But we didn't succeed." Lin Rui added, "We did have an advantage, but we didn't turn this advantage into a final victory. So we had to withdraw."

Ba En was helpless. From the bottom of his heart, he recognized Lin Rui's words, but he was forced to retreat just a step away from victory, which made him still a little unwilling.

Although unwilling, he led the team to evacuate. And it was completely withdrawn from the surrounding area of ​​Horu Town.

Because here will be the focus of the enemy's attack direction.

Unsurprisingly, an hour later, the outskirts of Horu town were hit by retaliatory artillery fire from the Orumi Federal Army.

boom! Boom, boom! ! !

A cannonball flew out of the barrel with a deafening roar, and fell in the air, whizzing and flying. The powerful explosive force carried an unstoppable momentum, smashing large pits in the position, where the explosion flame went. , Are all fragmented building fragments and soil mixed with fragments of vegetation, sprinkled into the sky at will.

This burst of shelling was like a signal flare. The other artillery of the Federal Army of Orumi roared like thunder, and the shells flew in with the screams of tearing the air, and everything in contact with it was powerful. Shattered by force.

The mercenaries who led the retreat had lingering fears, and even Ba En could only be thankful that they had retreated fast enough.

"Boss, they really started shelling to support." Barn whispered.

"We are not retreating enough. They have satellites to determine our approximate location, although it is unlikely to conduct blind shelling.

But it is very likely to have a pre-judgment of our position. Under the guidance of infantry reconnaissance, it is still possible to continue to launch counterattacks. Lin Rui whispered. "We must go further north." "

"Do you rely on the cover of the northern jungle? They would expect us to do this." The actuary warned in the communication channel.

"Perhaps we can move north, but not to the depths of the jungle, but lurking in the northwest of Horu Town. Currently Horu Town is still under their control. And further northwest of Horu Town is near the Achena Mine It's underfoot, and the enemy's heavy artillery is unlikely to hit there." Lin Rui replied.

"It was basically rocket launchers that attacked us just now. According to our anti-artillery radar, their location should be at least in Zone B of Songshi Town." Lin Rui continued.

Anti-artillery radar appeared before World War II and was developed for air defense purposes. Soon, there was a fire control radar that provided firing calibration for ship artillery and shore fire artillery.

This kind of radar provides shooting correction data for the artillery by finding the location of the splash caused by the shell that failed to hit the target. Under the technical conditions at the time, the radar could not directly track the shell itself. This was because the radar reflection area of ​​the shell was very small, and the radar using the mechanical scanning method at that time could not keep up with the flying speed of the shell.

In use, the operator found that under certain conditions, the radar is possible to find and track the trajectory of the projectile. After the radar obtains the different position information of a projectile at different time points, mathematical operations can calculate the projectile’s landing point and calibrate the shooting parameters of one’s own artillery. German engineers developed the "Darmstadt" gun sight based on this. radar.

The reverse derivation of the projectile's flight trajectory can theoretically find out the direction of the projectile’s attack, and then calculate the position of the enemy’s artillery. Based on this principle, the concept of anti-artillery radar was born. But this has higher requirements for radar performance, and the entire system must complete data calculations in a very short time, which is difficult to achieve under the technical conditions of World War II.

The technology of tracking the trajectory of the projectile to confirm the position of the enemy’s artillery was developed only after the end of World War II. The United States first developed the AN/MPQ-10 anti-artillery radar on the basis of the SCR-584 gun sighting radar during World War II.

However, this kind of radar can only be used to detect incoming mortar shells, because the trajectory of the mortar shells is a standard parabola, and the flying speed is not high. By solving the trajectory of the shells obtained by the radar, the enemy launch position can be obtained. Location information.

Since then, other countries have also introduced their own anti-artillery radars. Until the 1970s, this type of radar was mainly used for counter-mortars.

In the 1980s, the emergence of high-performance computers made the technology for fast and reverse ballistic calculation mature. Combined with digital map technology, it was possible to develop anti-artillery radar capable of detecting large-caliber howitzers and cannons. These radars can automatically calculate the position of the enemy's artillery and mark it on the map within a few seconds of detecting an incoming shell.

The development of phased array radar technology has further improved the performance of anti-artillery radar. Traditionally, in order to ensure accurate positioning of high-speed targets, anti-artillery radars generally use X-band. When working, the radar antenna uses a mechanical rotation method to detect at a scanning angle below 30 degrees horizontally, which makes the entire system detect an incoming attack. The efficiency of shells is relatively low.

The Anmore Army used the "Fire Finder" series provided by the Americans. The detection range of this kind of anti-artillery radar is generally 30-50km, and the specific parameters depend on the type and launch distance of the enemy's artillery. Moreover, their anti-artillery radars generally use vehicle-mounted methods, and their actions are very concealed.

Lin Rui also brought on a set of gun sighting radar this time, and this critical moment really came into play.

"Boss, since we can know the location of each other, why not organize our heavy artillery and kill their artillery directly?" Sausage asked.

"Thinking too much, the gun sighting radar provided by Yankee to Anmore is an old model that the military has eliminated. At most, it can only calculate the approximate range. It does not provide precise positioning.

Our heavy artillery is basically a rocket launcher, only a small number of 152 caliber cannon howitzers. The accuracy of the rocket launcher itself is a weakness, if you use inaccurate coordinates to shoot. The deviation can be imagined.

In the end, it failed to cause damage to the enemy, and it would alarm the enemy. So, you know what I mean. First try to hide, and then you must find a chance to kill the enemy's heavy artillery. "

"But how to solve the problem that can't be accurately located?" Kuaima also asked.

"We have one set of anti-artillery radar here, and another set in the Anmore Army. They will also carry out detection and deployment based on the results we have observed this time. When the time comes, the artillery of the Orumi Federal Army will use it again. A set of anti-artillery radars work at the same time.

Although used alone, the data obtained is not accurate enough, but when used at the same time, it can achieve the effect of triangulation. From two observation positions, the exact position of the enemy's artillery can be determined.

Then, let our heavy artillery come into play. "Lin Rui whispered.