How to judge whether the route is correct when the plane is flying in the air?

The method for judging the course of an airplane when flying in the air is as follows:

1, instrument navigation?

According to the data of airspeed, heading, attitude, angle of attack, drift angle, wind speed and wind direction measured by airspeed indicator and heading instrument, the distance is calculated, so as to determine the position of the aircraft.

Aircraft autopilot is an automatic navigation instrument, which can make this calculation process continue. Instrument navigation has certain autonomy, reliable operation, continuous operation and small volume and weight, but its navigation and positioning accuracy is lower than calibration.

2. Infrared navigation

Infrared radiometer is used to detect and display ground targets, and then compare with the known ground targets in advance to determine the position of the aircraft. Infrared navigation has a limited range and is greatly influenced by external conditions such as rain and fog, so it is necessary to know the infrared radiation emitted by the ground target itself in advance.

3. Panoramic radar navigation

The ground image is taken by radar, and then compared with the ground image taken in advance to determine the position of the aircraft. Navigation based on panoramic radar has also developed into automatic map navigation. Panoramic radar navigation is not limited by meteorological conditions, and its navigation and positioning accuracy is also high, but it is easy to be disturbed and has poor concealment when it wants to emit radio waves.

? Extended data:

navigation system

According to different working principles, aircraft navigation systems can be divided into many types.

1. Instrument navigation system: Using the data provided by simple instruments on the plane, various navigation parameters are obtained by manual calculation. These instruments are airspeed indicator, magnetic compass, directional gyroscope and altimeter. Later, from manual calculation to automatic calculation, there was an autopilot. Various simple instruments gradually developed into heading and attitude system and air data computer.

2. Inertial navigation system: three accelerometers installed on the inertial platform are used to measure the acceleration of the aircraft in three directions perpendicular to each other, and the computer integrates the acceleration signals once and twice to obtain the speed and displacement of the aircraft in three directions, thus continuously giving the spatial position of the aircraft.

Instead of using inertial platform to measure acceleration, the accelerometer can be directly installed on the fuselage, and then the signals provided by the heading system and attitude system can be input into the computer to calculate the speed and displacement of the aircraft. This is strapdown inertial navigation system.

3. Astronomical navigation system: Based on a celestial body (such as a star), the angle between the horizontal plane of the star and the line of sight (called the star height angle) is measured by a star tracker. The position line formed by points with equal height angles is a great circle on the earth. Two great circles can be obtained by measuring the height angle of two stars, and their intersection point is the position of the plane.

4. Integrated navigation system: a navigation system with more perfect performance composed of the above navigation systems.

References:

Baidu Encyclopedia-Aircraft Navigation System