"Doot toot!"

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At the same time, when the commander of the Red Army, Fan Tianlei, was giving combat orders to the fire phoenix and lone wolf group B, the sound of connection also came from the wireless headsets of Liu Mang's eight little powerhouses.

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"The little powerhouses who can't be killed, have you arrived at the battlefield, please answer if you receive it."

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He Zhijun's inquiring voice came from the wireless headset.

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"Report to the chief, we have arrived at the designated location, ready to carry out the next action according to your instructions at any time, chief!" Liu Mang responded.

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"That's right, comrades, I just received a tip-off that five of our comrades have been detained by the Red Army in Area C, and now I need you to go to the rescue." He Zhijun said.

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"During the rescue, I ask you not to startle the enemy and disturb the enemy, and you must rescue our five comrades safely!"

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"Roger!"

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Liu Mang responded: "Let's start acting now!" ”

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"Guaranteed to complete the mission!"

"Okay, come on, comrades!" He Zhijun cheered everyone in the microphone.

Immediately afterwards, Liu Mang said: "At your location, five meters away, behind a stone, there is a backpack with some necessary equipment we have provided for you!" ”

"Roger, chief, we'll get ready."

Then Liu Mang walked out of the stone pointed by He Zhijun, and then hung up the wireless headset.

The stone was not far away, and there was an army-green backpack in the back, and after opening it, Liu Mang took out a positioning device similar to a tablet from it.

Inside is installed the Big Dipper positioning device.

It belongs to a branch of the Big Dipper navigation system class.

The Beidou Navigation Satellite System is a global satellite navigation system developed by China itself. It is the fourth mature satellite navigation system after the United States Global Positioning System, the Russian GLONASS Satellite Navigation System, and the European Galileo Satellite Navigation System.

It is composed of three parts: space segment, ground segment and user segment, which can provide high-precision and high-reliability positioning, navigation and timing services for all kinds of users around the world around the world and all day, and has the ability of short message communication, and has initially possessed regional navigation, positioning and timing capabilities, with a positioning accuracy of 10 meters, a velocity measurement accuracy of 0.2 m/s, and a timing accuracy of 10 nanoseconds.

At an altitude of more than 20,000 kilometers above the ground, 35 satellites orbit the earth in a fixed period, so that more than four satellites can be observed at any time and at any point on the ground.

The precise source of all the positions in our military comes from the Big Dipper navigation system!

Satellite positioning implements the concept of "time difference of arrival" (time delay): the time difference of arrival from satellite to receiver is obtained by using the precise position of each satellite and the navigation information generated by the atomic clock on board the satellite transmitted continuously.

Satellites continuously transmit radio signals with time and position information in the air for receivers to receive. Due to the distance of transmission, the moment when the receiver receives the signal is delayed than the time when the satellite transmits the signal, which is usually called the time delay.

Therefore, the distance can also be determined by the delay. The satellite and receiver generate the same pseudo-random code at the same time, and once the two codes are time synchronized, the receiver can determine the time delay. Multiply the delay by the speed of light to get the distance.

Due to the errors in the orbit and clock of the satellite, and the influence of the troposphere and ionosphere on the signal in the atmosphere, the positioning accuracy of civil use is only tens of meters. In order to improve the positioning accuracy, differential positioning technology, such as DGPS and DGNSS, is widely used to establish a ground reference station (differential station) for satellite observation, and the precise coordinates of the known reference station are used to compare with the observed value, so as to obtain a correction and release it to the public.

After receiving the correction, the receiver compares it with its own observations, eliminating most of the errors and obtaining a more accurate position. Experiments show that the positioning accuracy can be improved to the meter level by using differential positioning technology!

Therefore, the accuracy of the domestic military positioning device is extremely high, and the display shows that the hostages are there, right there, and the error can be said to be basically close to 0!

The military function of the Beidou satellite navigation and positioning system is similar to that of GPS, and it is applied to many military activities, such as the positioning and navigation of moving targets, the rapid positioning of the launch position of weapons and vehicles to shorten the reaction time, and the positioning needs of personnel search and rescue, and water demining.

Quite a lot of uses.

Even the command system in the military is a dedicated military function provided by the Big Dipper navigation system......

"Ding!"

"Ding!"

All this is a long story, in fact, after Liu Mang took out this positioning device like a tablet from his backpack, he quickly clicked the switch, and soon a picture of red dots flashing appeared on it.

Liu Mang pointed to the flashing red dot on it and said: "This is the place where the hostages in Area C are held, and the exercise we are conducting now should be a rescue project, the red side will definitely be heavily guarded in this place, or around, and we must rescue the hostages safely without alarming their large forces." ”

After speaking, the hooligan continued: "For the next period of time, everyone must give priority to orders, and there is no shooting order to prohibit shooting, otherwise it is easy to expose the position, and the red side opposite is two first-class special operations troops, which are all a group of old fritters." ”

"Roger!"

The crowd responded.

Immediately afterwards, under the leadership of Liu Mang, the unbeatable Xiaoqiang crossed the mountains and forests at great speed, approaching the hostage detention point on the positioning device.

In the process of crossing, everyone has a solemn expression on their faces, always paying attention to the surrounding situation, and ready to face all possible emergencies at any time.

The mountains and forests seem to be calm now, but they are already full of primitive traps prepared by the red side for the blue side, as well as modern mines.

If you don't pay attention to the fact that everyone on the BLU side approaches the hostage point at great speed, they will be taken away by the traps prepared by the red side and a wave of mines.

The empty ammunition still used in this exercise is not live ammunition.

When the Blues are hit, blue smoke rises from the place where they are hit, indicating that they have been killed.

When the Red Army is hit, where it is hit on its body, red smoke will rise, indicating that it has been killed.

In order to ensure the integrity of the team, Liu Mang walked alone in the forefront, relying on the crisis sense provided by the beast's intuition, he easily dodged dozens of primitive traps prepared by the Red Army.

and mines sold in caches.

In this way, under the leadership of Liu Mang, the unbeatable Xiaoqiang suddenly stopped after crossing the mountains and forests for about half an hour.

"There is a situation!"

Liu Mang raised his palm upwards and signaled everyone to stop advancing.

"Everyone's mind is hidden!"

Watching Liu Mang make a concealed hand gesture again, the unbeatable Xiaoqiang quickly dispersed, pulled their respective bolts, raised their guns and aimed around, and each of them stood guard in a direction.

"What's the situation with the captain?"

Shi Dafan asked.

"At seven o'clock, there is an enemy sniper at two hundred and sixty meters!"

Liu Mang's eyes narrowed slightly, the light was shining, and then he responded one after another.

"At eight o'clock, there is an enemy sniper at three hundred and seventy-five meters!"

"At nine o'clock, there is an enemy sniper at a distance of one hundred and seventy meters!"

ps: The second more delivered. Two shots in a row.

Wrote the third chapter, and the fourth chapter went.

Update it together after writing.