The Difference between Tilt Sensor and Gyro Sensor

 

The tilt sensor senses the angle of inclination deviation, only data feedback but no command feedback.

The gyroscope measures the angular velocity, senses the action variable, and then controls the steering gear to carry out the repair action command.

The tilt sensor uses Newton’s second law as its working principle. According to the law, we know that when the inclination sensor is stationary, because the side of the object and the vertical direction are affected by other forces, only the action of gravity, that is to say, it acts on the all it has on it is the acceleration of gravity. Therefore, the resulting angle between the vertical axis of gravity and the sensitive axis of the acceleration sensor is what we call the inclination angle, which is the angle we seek.

Tilt sensors are divided into three different working principles and are divided into three types. The first type of inclination sensor is the solid pendulum type, the second type of inclination sensor is called the liquid pendulum type, and the last type of inclination sensor is the gas pendulum type. The working principles of these three different types of inclination sensors will be different. Because of their different working principles, they will have different advantages and disadvantages.

No matter which type of tilt sensor it is, it will be substantially different from a gyroscope. Like inclination sensors, no matter which type it is, it measures the inclination angle at rest. Compared with the inclination sensor, the gyroscope measures the inclination in motion, and the measurement result of the inclination in static is not accurate. So when we measure the inclination in our daily life, whether to choose the inclination sensor or the gyroscope, we can choose according to this essential difference. If the inclination is measured at rest, then the inclination sensor must be selected, and the inclination in motion is measured, and of course the gyroscope is selected. The specific differences are summarized as follows:

1.Different definitions

The gyroscope is an angular motion detection device that uses the momentum moment-sensitive shell of a high-speed revolving body relative to the inertial space around one or two axes that are orthogonal to the axis of rotation. There are many varieties of gyroscopes, which can be divided into sensing gyroscopes and indicating gyroscopes according to their uses. The ER-MG2-022 is a single-axis MEMS angular rate sensor (gyroscope) capable of measuring angular velocity up to a maximum of ±100°/s with digital output compliant to SPI slave mode 3 protocol.  Angular rate data is presented as a 24-bit word, intended for north seeking applications.  An advanced, differential sensor design rejects the influence of linear acceleration, enabling the ER-MG2-022 to operate in exceedingly harsh environments where shock and vibration are present.

The sensor gyroscope is used in the automatic control system of the flying body movement, as a horizontal, vertical, pitch, heading and angular velocity sensor. The indicating gyroscope is mainly used for the indication of the flying condition, and is used as a driving and piloting surface.

2.Different functions

The tilt sensor measures the inclination of all stops. Compared with the inclination sensor, the gyroscope measures the inclination angle during the movement, and the measurement result of the inclination angle in the static state is inaccurate. The gyroscope is not a measuring device, but an auxiliary device. Just like the tank barrel, in order to allow the tank to shoot accurately during the trek, a gyroscope is installed to automatically control the viewpoint of the barrel.

3.Different applications

The tilt sensor is often used for the level measurement of the system. From the working principle, it can be divided into three types of inclination sensors: “solid pendulum”, “liquid pendulum” and “gas pendulum”. The inclination sensor can also be used to measure the inclination relative to the horizontal plane. The amount of change.

The gyroscope sensor was originally used on the helicopter model, and it has been widely used in mobile portable devices such as mobile phones. Not only that, the modern gyroscope is an instrument that can accurately determine the orientation of moving objects, so the gyroscope Sensors are essential controls in modern aviation, marine, aerospace and defense industrial applications.

Smallest Size Triaxial MEMS North Seeker

 ER-MNS-06 (0.25°-1°):

1. Smallest Size MEMS north seeker in the world;
2. Resistant to harsh mechanical environment;
3. Light weight, low power consumption.

ER-MNS-06 MEMS North Seeker is the world’s smallest triaxial MEMS north seeker, which is composed of a three-axis MEMS gyroscope and accelerometer, can measure the true north. It has the characteristics of small size, light weight, low power consumption, resistance to harsh mechanical environment, and is widely used in mining, tunnel construction and other fields.

Technical Features

Smallest size MEMS north seeker in the world

Triaxial MEMS gyro and accelerometer

Light weight, low power consumption

Resistant to harsh mechanical environment

If you need a north seeker, you can send your needs directly to the email . We will send the price and catalog to you！
E-mail：info@ericcointernational.com

How does Inertial Positioning Solve the Problem of Gyroscope Drift and Magnetic Field Interference?

In order to solve the problems of integral error and magnetic field interference of gyroscope and electronic compass in attitude calculation of navigation system, a fusion algorithm of Kalman filter and complementary filter was proposed. First, the electronic compass and gyroscope are obtained through the Kalman filter to obtain the optimally estimated quaternion. Then, the complementary filtering algorithm is used to compensate for the drift of the gyroscope to obtain the corrected quaternion. Then, the obtained quaternion and Kalman filters are used to obtain the optimally estimated quaternion, and the second optimal estimation of the quaternion is conducted through the Kalman filter. Then output attitude Angle. The results of the proposed algorithm, the complementary filtering algorithm, and the non-filtering algorithm are compared in the experiment. Experiments show that the algorithm can not only effectively solve the divergence of azimuth error, but also effectively solve the magnetic field interference, and achieve high precision azimuth output.

For more info Ericco Gyro Sensor.

With the development of miniaturized inertial devices represented by MEMS (Micro-Electromechanical Systems) sensors, the inertial positioning technology based on strapdown inertial navigation principle and MEMS sensors is increasingly paid attention to. Especially in indoor, underground, mine, underwater, battlefield, and other occasions where satellite signals are difficult to receive [1].In view of the above problems, the electronic compass is often used to correct the gyro. In the indoor, underground, mine, underwater, and other processes, the magnetometer is more prone to interference, resulting in greater deviation of orientation. To solve the problems of magnetometer vulnerable to interference and gyro integral drift, there have been numerous fusion algorithms, such as Kalman filter, untracked Kalman filter (UKF), extended Kalman filter (EKF), etc. [2-4]. These filtering methods need to establish accurate state equations and observation equations. There is another filtering algorithm that extends on the basis of complementary filterings, such as classical complementary filtering and complementary filtering algorithm based on gradient descent method [3-6]. However, the accuracy of this filtering algorithm is not high. Face these problems, this paper proposes an inertial positioning algorithm of Kalman filtering and complementary filtering fusion, the algorithm in the design of Kalman filter, the accelerometer and magnetometer fusion of quaternion as observed value, using the gyroscope of a quaternion as a status value, through the data fusion filtering, complete the quaternion optimal estimate for the first time, For the gyro drift problem, the designed complementary filter is used to compensate the gyro drift, and the corrected angular velocity is obtained, and then the continuously updated quaternion after correction is obtained. Then, the optimal estimation quaternion completed at the first time is estimated through the second Kalman filter, and then the high-precision attitude angle is output.

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What is the structure of a Gyro Theodolite?

 

A gyro theodolite consists of a gyroscope, theodolite and a tripod.

(1) Gyroscope
The gyroscope is the core of the system, which is mainly composed of gyro sensitive parts, electromagnetic shielding mechanism, suspension wire and guide wire, azimuth rotation servo drive device, damping device, inertial sensitive part locking device, support leveling device, photoelectric angle sensor, power supply, control and display.

The sensitive part of the gyro is equipped with a gyro motor that rotates at a constant speed. The gyro motor is suspended on the gyro frame by a suspension wire, and the power is provided by the guide wire.

The gyro sensitive part locking device is to ensure the safety of the gyro sensitive part in the transportation state, and the inertial sensitive part is fixed with the frame.

The purpose of the damping device is to attenuate the swing amplitude of the sensitive part of the gyro after the release, so that the swing state meets the north-seeking requirements, and finally overcome the northing moment, so that the sensitive part of the gyro is relatively stable in a fixed position.

The azimuth indentation servo drive system can realize the azimuth rotation of the gyro, provide rotational torque and stable transmission.

The supporting and leveling device can realize the mechanical and optical docking of the theodolite and the gyroscope, the leveling of the entire instrument and the installation and fixation of various components.

The photoelectric angle sensor includes a photoelectric angle sensor that detects the swing angle of the inertial sensing part and a grating code disk system that detects the azimuth rotation angle of the gyro.

Electro-magnetic shielding is mainly used to shield the interference of internal and external magnetic fields on gyro north finding.

The control and display part collects and processes signals through sensors, and completes the functions of locking and releasing the sensitive part of the gyro, damping control, azimuth tracking, communication, calculation, sending and displaying true north position.

(2) Theodolite
Theodolite is the bearing extraction device of the system. It is also possible to measure the geographic azimuth or coordinate azimuth of the target by aiming at the target. The theodolite has a self-collimation function, which is convenient for measurement and calibration. Usually theodolite has a serial communication interface, which can realize the serial data communication and command system with the gyroscope.

(3) Tripod
The tripod provides support for the gyro theodolite.

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