Technology behind camera drones with "follow" function

In summary, most modern camera quadcopters have a "follow" function that allows them to track and film a person. The DJI Phantom 4 uses optical tracking, while other brands require a smartphone or wearable to be carried by the person being followed. The process involves the drone receiving coordinates from the sender's GPS and comparing them to its own, with differential GPS achieving a high level of accuracy. However, atmospheric effects can still impact the precision of GPS.
  • #1
greypilgrim
548
38
Hi.
Most modern camera quadcopters (drones) have a "follow" function, allowing them to follow and film a person. The DJI Phantom 4 does this by optical tracking, most other brands require that the person carry a smartphone or other wearable.

How does this work? I assume the smartphone or wearable sends a signal, but how can a single drone determine its distance and direction from the source? Obviously not by triangulation.

Or is it that simple that both the smartphone/wearable and the drone must have GPS and the drone simply receives the coordinates of the sender, compares them with its own and follows? But is this fast and accurate enough? As far as I know GPS is only accurate to a couple of meters, which could bring the drone dangerously close to the person it follows so far away that the camera shots become useless.
 
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  • #2
I don't know what exactly the different tools are using, but GPS is precise enough. The absolute precision of GPS is not good, but the problem mainly comes from atmospheric effects - nearby GPS devices will have the same measurement errors so they cancel in the difference. Even if the receivers are kilometers apart this differential GPS can achieve an accuracy of about a centimeter.
 

FAQ: Technology behind camera drones with "follow" function

How do camera drones with "follow" function track their subjects?

The technology behind camera drones with "follow" function involves the use of sensors and algorithms. Drones are equipped with GPS, visual sensors, and other tracking technologies that allow them to detect and track their subject's movements. These sensors work together with the drone's flight control system to adjust its position and maintain a steady distance from the subject.

What is the range of the "follow" function on camera drones?

The range of the "follow" function on camera drones varies depending on the model and the environment. In general, most camera drones can track their subject within a range of 100-300 feet. However, factors such as obstacles, weather conditions, and battery life can affect the range of the "follow" function.

How do camera drones with "follow" function avoid collisions?

Camera drones with "follow" function use obstacle avoidance technology to avoid collisions. This technology involves the use of sensors, such as infrared or ultrasonic sensors, to detect obstacles in the drone's path. When an obstacle is detected, the drone's flight control system will adjust its path to avoid the obstacle and continue tracking the subject.

Can camera drones with "follow" function track multiple subjects?

Some camera drones with "follow" function have the capability to track multiple subjects at once. This is achieved through the use of advanced algorithms that can detect and track multiple objects simultaneously. However, the accuracy and range of the "follow" function may be affected when tracking multiple subjects.

Are there any safety features on camera drones with "follow" function?

Yes, most camera drones with "follow" function come with safety features to prevent accidents and injuries. These features include return-to-home function, low battery warning, and emergency stop button. It is important to familiarize yourself with these safety features before operating a camera drone with "follow" function.

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