How to measure the altitude of Multicopter/Quadcopter UAV Drone?

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Welcome Again! In this post we will discuss about the main part of the whole Quadcopter/Multirotors system. Here we will learn about How to measure the altitude of Multicopter/Quadcopter UAV Drone? Before knowing about How to measure the altitude of Multicopter/Quadcopter UAV Drone? you must know the basics of Quadcopters or UAV or Multirotors. As we are discussing about How to measure the altitude of Multicopter/Quadcopter UAV Drone? so we must know about the system on which we want to implement it.

How to measure the altitude of Multicopter/Quadcopter UAV Drone?

INTRODUCTION


sonar, altitude of drone, barometer, radar

It is very important for  pilot to know exact position of quad copter. At higher altitude velocity of air increases significantly which can create problem in balancing the drone.To know the exact co-ordinate of quad copter we can use many methods like SONAR, RADAR, GPS system, BAROMETER  technique etc.

How to measure height using different technique:

SONAR

sonar, altitude of drone, barometer, radar

In this technique we transmit a sound signal which will be reflected back from ground. By using power transmitted and received we can find the altitude easily.

RADAR

sonar, altitude of drone, barometer, radar
Radar

It uses a radio signal to transmit. It calculates the height using time taken by signal reflected from ground to quad copter. It uses Frequency Modulated Continuous-wave for transmission. It measure the frequency shift which is dependent on distance traveled by wave from drone.

GPS system

It uses satellite to give co-ordinates of drone. it uses three satellite to give two dimensional co-ordinates and uses four Satellite to give.But it is very uncommon to be used for height measurements because it is not much accurate. It’s accuracy depends upon satellite orientation.

BAROMETER

sonar, altitude of drone, barometer, radar

It uses the parameter pressure to measure height . With altitude pressure decreases so this pressure change is used to measure height of aircraft.It follow the below equation to find height:

z=c\;T\;\log(P_{o}/P)

where

c is constant,

T is temperature,

Po is the pressure at sea level,

P is the pressure at altitude z

In quad copter we use two method to find height of aircraft SONAR and BAROMETER.Two method are used because barometer is not accurate at lower levels so may cause landing problem.For that we used sonar upto 2 meters from reference level and after that we use barometer.By using these two methods we can get mostly correct reading about altitude of quad copter.

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3 COMMENTS

    • GPS is used to measure the coordinates of the surface (x-y) using satellites….
      You must study about DGPS i.e Differential GPS or we will update you through an article

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