At present, the P20 V2 plant protection drone has begun to operate on the farmland in Xinjiang, Henan and other places, and the flight path has been shifted less than a bank card. Today, let's take a look at the RTK technology that enables the P20 V2 to achieve high-precision and stable flight.
Before using the RTK module, the P20's mapping and flight positioning are both dependent on GPS technology, but because the path of the GPS signal passing through the ionosphere and the troposphere is bent, the propagation path changes and the signal transmission time Δt is deviated. , resulting in GPS positioning accuracy ≥ 1 meter.
In addition to the effects of the ionosphere and the troposphere, GPS signals may also be received after reflection on different obstacles. This is called “multipath effectâ€. In addition, the satellite uses a cesium atomic clock, and the GPS receiver does not necessarily use a cesium atomic clock. Because it is expensive, the time between the two may not be synchronized, just as the time on your watch is not synchronized with the time of your living room wall clock. There will be a so-called "clock difference."
The ionosphere, troposphere, clock difference, multipath effect and other factors are the biggest mistakes of GPS, even the culprit of more than ten meters.However, in the course of the actual operation, we found that crops in the earth are facing the sun and rain, and they are still sensitive and fragile and need care. Agricultural plant protection is actually a fine work.
The width of the field of farmland in China is generally small, and the accuracy of the flight path of plant protection drones is relatively high. If the plant protection drone can't do the precise spraying, it will not achieve the effect of preventing pests and diseases, and even cause phytotoxicity.
Therefore, in order to enable the plant protection drone to spray more accurately, Feifei has adopted a new positioning technology, RTK, in the new generation of P20 V2 plant protection drones.
Comparing the upper and lower graphs, we can find that there are two main differences between RTK technologies:
(1) The distance between the receiver and the satellite is different by calculating the signal transmission time Δt and then multiplying Δt by the speed of light c; the RTK module receives the carrier signal transmitted by the satellite and passes the number of wavelengths of the carrier signal. And the calculation of the phase information to obtain a more precise distance between the satellite and the receiver;(2) Adding a base station with known own precise coordinates, transmitting observation data (phase observation value) and known data (precise coordinates) to the RTK module in real time, thereby eliminating satellite clock error, ephemeris error, and correcting the signal at Errors in propagation in the ionosphere and troposphere.
In layman's terms, compared to the previous generation of GPS positioning technology, RTK uses the more accurate "ruler" of "carrier", and further reduces the error of the "ruler" itself by means of "differential", and the accuracy of multiple guarantee data. Sex, which reduces the meter-level error to the centimeter level.
We are using RTK like this
Using a hand-held plotter equipped with an RTK module for plot measurement, high-precision field boundary information can be measured to plan a route with a centimeter accuracy.
The P20 V2 equipped with the RTK module can accurately spray along the pre-set route during flight. The error of the flight offset is within the range of centimeter, and there is no phenomenon of heavy spray or leakage.
At present, Xinjiang, Henan, Jiangsu, Hubei and Shandong are about to usher in the peak season of plant protection. With the full deployment of the new generation of plant protection drones, P20 V2 is about to fly over more and more farmland.
KNB1-100 Mini Circuit breakers, also named as the air switch which have a short for arc extinguishing device. It is a switch role, and also is a automatic protection of low-voltage electrical distribution. Its role is equivalent to the combination of switch. Fuse. Thermal Relay and other electrical components. It mainly used for short circuit and overload protection. Generally, According to the poles, mini Circuit breaker can be divided into 1P , 1P+N , 2P, 3P and 4P.
KNB1-100 Miniature Circuit Breaker
KNB1-100 Miniature Circuit Breaker,Electronics Miniature Circuits Breaker,Automatic Miniature Circuit Breaker,Mini Circuit Breaker
Wenzhou Korlen Electric Appliances Co., Ltd. , https://www.zjaccontactor.com