UAV developers recommend UAVs to various fields: in peacetime, they can monitor pipelines in the tundra, search for forest fires, and search for fish schools, etc. In wartime, they can perform reconnaissance, low-altitude bombing, and attack on steep terrain. Targets (such as caves) launch air-to-ground missiles and other tasks. But no one could have imagined that these tasks might not be completed in wartime for the following reasons.

　　With the gyroscope-based inertial navigation system alone, UAVs cannot obtain sufficiently accurate self-coordinate data. Therefore, the flight control of UAVs in various countries adopts the combination of GPS satellite navigation system and inertial navigation system. When UAVs carry out photographic reconnaissance of stationary tanks, they must obtain the geographical coordinates of the target, and this can only be achieved with the help of GPS systems (in the future, the "GLONASS" or "Galileo" satellite navigation systems can also be used).

　　The drone also needs to know its precise location when taking pictures, so a GPS signal receiver is installed on the drone. The GPS signal receiver can not only continuously measure the current coordinates of the UAV, but also can start work regularly to correct the inertial navigation system. The drone still needs to know its geographic coordinates to return to the base after obtaining intelligence. UAV precision bombing and launching air-to-ground missiles also need to accurately determine their current position relative to the target, and inertial navigation systems cannot provide the required accuracy of positioning data.

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