The UAV industry on the tall?

1. What is a drone?

Answer: UAV is the abbreviation of Unmanned Aerial Vehicle. It is an unmanned aircraft using radio remote control equipment and its own program control device, including unmanned helicopter, fixed-wing aircraft, multi-rotor aircraft, unmanned airship and unmanned paraglider. Broadly speaking, it also includes near space vehicles (20-100 km airspace), such as stratospheric airships, high-altitude balloons, solar drones and so on. From a certain point of view, UAV can complete complex air flight tasks and various load tasks under unmanned conditions, and can be regarded as an "air robot".

2. What is flight control?

The so-called flight control of UAV is the flight control system of UAV, which mainly consists of gyroscope (flight attitude perception), accelerometer, geomagnetic induction flight control, air pressure sensor (rough control of hovering height), ultrasonic sensor (precise control of low altitude height or obstacle avoidance), optical flow sensor (precise determination of hovering horizontal position), GPS module (rough positioning of horizontal position height) and control circuit. The main function is to automatically maintain the normal flight attitude of the aircraft.

3. Remote control and receiver?

A: A model airplane needs a device to control it. This device is the remote control, and the corresponding airplane needs a device to receive instructions from the remote control. This device is the receiver. The remote controller communicates with the receiver through radio waves, and the commonly used radio frequencies are 72Mhz and 2.4Ghz (72MHZ long wave was mainly used in the early days, and now 2.4GHZ short wave is mainly used in technical progress). The remote controller can set some flight parameters, such as the forward and reverse of throttle, the sensitivity of rocker, the adjustment of neutral position of steering gear, the function definition of channel, the recording and reminding of aircraft time, the setting of lever function, and the advanced functions include battery voltage and current data returned by model airplane, etc.

4. Crystal oscillator and counter frequency?

Answer: When using the 72Mhz remote controller, due to the openness of radio waves, 50 channels are allocated every 20kHz in the 72MHz frequency band from 72.010MHz to 72.99MHz, so that the remote controller and the receiver have a frequency generator (crystal oscillator) with the same frequency, so that the receiver and the remote controller can communicate. With the development of technology, the 2.4Ghz remote controller no longer needs to be matched with a single crystal, but only needs to directly calibrate the frequency between the remote controller and the receiver, so that the remote controller and the receiver can directly establish communication connection. Because of the demand and price, 40MHZ and 27Mhz are mainly used for household remote control toys, and the remote controllers with the same frequency can sometimes be commonly operated with each other. This problem also exists in airplane models. Therefore, when using the remote controller of 72Mhz in the early days, when the model friends arrive at the flying field, they will first know each other's remote control frequency bands to avoid misoperation. 2.4Ghz, which is widely used now, is not needed.