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<blockquote data-quote="Mr Geek" data-source="post: 79111" data-attributes="member: 15144"><p>On the non-GPS navigation scenario, I really do believe the Spark can actually navigate without GPS at some level. The IMU plays a crucial role in this (see below)l, along with the compass and time. I have also seen a post in this thread where a person lost GPS signal and yet the Spark returned to home. Anyway, I am just wondering and looking to learn, it's a great forum and discussions like this are very helpful. Here's info on what data the IMU provides which seems logical that this information could assist in non-GPS navigation routines when the Spark switches to ATTI mode:</p><p></p><p><span style="font-size: 22px"><em>The Essential Drone IMU </em></span></p><p><em>An inertial measurement unit works by detecting the current rate of acceleration using one or more accelerometers. The IMU detects changes in rotational attributes like pitch, roll and yaw using one or more gyroscopes. Some IMU on drones include a <a href="https://en.wikipedia.org/wiki/Magnetometer" target="_blank">magnetometer</a>, mostly to assist calibration against orientation drift.</em></p><p></p><p><em>On board processors continually calculate the drones current position. First, it integrates the sensed acceleration, together with an estimate of gravity, to calculate the current velocity. Then it integrates the velocity to calculate the current position.</em></p><p></p><p><em>To fly in any direction, the flight controller gathers the IMU data on present positioning, then sends new data to the motor electronic speed controllers (ESC). These electronic speed controllers signal to the motors the level of thrust and speed required for the quadcopter to fly or hover.</em></p><p></p><p><em>How a takes off and flies is fascinating technology. In another article entitled “<a href="https://www.dronezon.com/learn-about-drones-quadcopters/how-a-quadcopter-works-with-propellers-and-motors-direction-design-explained/" target="_blank">How A Quadcopter Flies</a>” we explain nice and simply how a drone can take off, hover, fly in any direction and land by adjusting its motor and propeller directions. The article includes some very informative videos.</em></p><p></p><p><em>Drone have many parts and you can read all about the various <a href="https://www.dronezon.com/learn-about-drones-quadcopters/drone-components-parts-overview-with-tips/" target="_blank">drone parts here</a>. This covers all the physical components found in most quadcopters.</em></p></blockquote><p></p>
[QUOTE="Mr Geek, post: 79111, member: 15144"] On the non-GPS navigation scenario, I really do believe the Spark can actually navigate without GPS at some level. The IMU plays a crucial role in this (see below)l, along with the compass and time. I have also seen a post in this thread where a person lost GPS signal and yet the Spark returned to home. Anyway, I am just wondering and looking to learn, it's a great forum and discussions like this are very helpful. Here's info on what data the IMU provides which seems logical that this information could assist in non-GPS navigation routines when the Spark switches to ATTI mode: [SIZE=6][I]The Essential Drone IMU [/I][/SIZE] [I]An inertial measurement unit works by detecting the current rate of acceleration using one or more accelerometers. The IMU detects changes in rotational attributes like pitch, roll and yaw using one or more gyroscopes. Some IMU on drones include a [URL='https://en.wikipedia.org/wiki/Magnetometer']magnetometer[/URL], mostly to assist calibration against orientation drift.[/I] [I]On board processors continually calculate the drones current position. First, it integrates the sensed acceleration, together with an estimate of gravity, to calculate the current velocity. Then it integrates the velocity to calculate the current position.[/I] [I]To fly in any direction, the flight controller gathers the IMU data on present positioning, then sends new data to the motor electronic speed controllers (ESC). These electronic speed controllers signal to the motors the level of thrust and speed required for the quadcopter to fly or hover.[/I] [I]How a takes off and flies is fascinating technology. In another article entitled “[URL='https://www.dronezon.com/learn-about-drones-quadcopters/how-a-quadcopter-works-with-propellers-and-motors-direction-design-explained/']How A Quadcopter Flies[/URL]” we explain nice and simply how a drone can take off, hover, fly in any direction and land by adjusting its motor and propeller directions. The article includes some very informative videos.[/I] [I]Drone have many parts and you can read all about the various [URL='https://www.dronezon.com/learn-about-drones-quadcopters/drone-components-parts-overview-with-tips/']drone parts here[/URL]. This covers all the physical components found in most quadcopters.[/I] [/QUOTE]
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