How does the drone communicate with the outside world (eg PC ground station, mobile APP, RTK base station)? I believe that most people will think of digital radio stations. It is true that digital radio stations play a big role in the data transmission of the previous drones. Even today, most data transmissions on drones use digital radio stations.
Advantages of digital radio station: 1 stable data transmission within the effective range; 2 real-time transmission.
Disadvantages of digital radio: 1 Generally, the transmission distance of small-power digital radio stations is about 2 kilometers, which is difficult to meet the development needs of drones; 2 digital transmission has certain radiation.
So, is there any way to make up for the shortcomings of digital radio? Next, let's take a look at the new application scheme - cloud base station and cloud control technology.
What is a cloud base station?
The cloud base station, that is, the RTK base station, is organically combined with the cloud platform and cellular communication technology.
RTK (Real-Time Kinematic), the key to RTK technology is the use of GPS carrier phase observation, and the spatial correlation of observation errors between the reference station and the mobile station is utilized, and the mobile station is removed by differential means. Observe most of the errors in the data to achieve high-precision (decimeter or even centimeter-level) positioning.
Network RTK Jinyun Base Station
Network RTK: A GPS network composed of reference stations to estimate the GPS error model of an area and provide correction data for users in the network coverage area. The user does not receive the observation data of an actual reference station, but the data of a virtual reference station and the correction data of a reference grid that is closer to its own location. Therefore, the network RTK technology is also called virtual. Reference station technology.
At present, the commonly used Chihiro RTK belongs to the network RTK. It is known that the cloud base station successfully applied to the plant protection flight control has a flying intelligent control and a very flying.
What is cloud control?
UAV cloud control combines drones, cloud platforms, and cellular network technologies to achieve over-the-horizon control.
Advantages of cloud control: 1 In the network environment, the control has no distance limitation; 2 The use scene is extensive (UAV logistics, power inspection, flight protection, etc.).
Disadvantages of cloud control: 1 Due to the limitation of mobile network coverage, the high-altitude mobile signal is weak, making cloud control unable to adapt to high-altitude environment (the high-altitude mobile signal above 100m will be unstable or unusable); 2 cloud control will generally have about 2 seconds Control delay (does not affect normal use). The practical application of cloud control technology, it is known that in 2016, Yizhizhi successfully applied cloud control to logistics drones. In 2017, China Southern Power Grid successfully applied cloud control to power inspection drones.
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Planar Die Construction Sealed Glass Case Ideally Suited for Automated Insertion - 75V Nominal Zener Voltages
Case: MiniMELF, Glass Terminals: Solderable per MIL-STD-202, Method 208 Polarity: Cathode Band Approx. Weight: 0.05 grams= 25°C unless otherwise specified Symbol Pd VF RqJA Tj, TSTG Value to +175 Unit mW V K/W °C
Characteristic Forward Voltage = 200mA Thermal Resistance, Junction to Ambient Air (Note 2) Operating and Storage Temperature Range Notes:
1. Tested with Pulses, 20ms. 2. Valid provided that Electrodes are kept at Ambient Temperature.
1. Tested with pulses = 20 ms. 2. Valid provided that electrodes are kept at ambient temperature.
VZ, ZENER VOLTAGE (V) Fig. 1, Zener Current vs Zener Voltage
25 20 VZ, ZENER VOLTAGE (V) Fig. 8, Zener Current vs Zener Voltage
TA, AMBIENT TEMPERATURE (°C) Fig. 3, Power Dissipation vs Ambient Temperature
15 20 VZ, ZENER VOLTAGE (V) Fig. 4, Differential Zener Impedance
VZ, ZENER VOLTAGE (V) Fig. 5, Junction Capacitance vs Zener Voltage
MINI MELF,Smd mini melf,zener mini melf,mini melf package,mini melf resistor,mini melf diode,mini melf resistor datasheet
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