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Two Axis Electro Optical Sensor
Two Axis Electro Optical Sensor
The two axis electro optical sensor is widely utilized in astronomical navigation, fire control tracking, and aircraft landing guidance, etc.two axis electro optical sensor Its target measurement accuracy serves as a critical technical indicator and directly impacts the navigation precision, target hit rate, and aircraft landing accuracy. Therefore, enhancing its measurement accuracy is of paramount significance to achieve a higher mission success rate.
In dimensional metrology, a typical method for specifying the position of an object in a plane or in 3D space based on the multi-axis Cartesian coordinate system involves orthogonally placed multiple linear displacement sensors such as laser interferometers and linear encoders.two axis electro optical sensor However, the dynamic angular movement of a target can be difficult to detect with these sensors because of the influence of Abbe errors in the measuring process.
To overcome this challenge, the researchers proposed a new dual-axis inertially stabilized platform (ISP) to facilitate continuous Yaw and Pitch rotations, respectively, to support target surveillance and tracking. The ISP structure consists of an inner gimbal that carries the electro-optical (EO) devices and an outer gimbal that performs the yaw and pitch rotations. The EO devices are mounted on the ISP in the elevation direction (GY) and are oriented toward a target to be tracked. The yaw and pitch rotations of the ISP provide accurate feedback to the EO devices to stabilize their positioning.
Optical sensors are used to monitor structures that generate, produce, distribute, or convert electrical power. They are also used to monitor structures that carry, transmit, or convert oil and gas; examples include pipelines, offshore platforms, wind turbine blades, railway, airplane wing, and ship hull monitoring. The main types of optical sensors are passive and active. Passive sensors are characterized by the fact that they reflect light from their surroundings or their environment, while active ones have their own light source. Optical sensors can be categorized as monostatic or bistatic, depending on whether their light source is situated close to the sensor or located in free space.
For a monostatic two-axis electro optical sensor, the light source and the detector are situated at the conjugating front and focal planes of an objective lens. The image of the target G1 is projected onto the plane of the target G2 at a distance Dth from the optical axis of the objective lens. This distance can be converted into a perpendicularity error of the LOS to the target centroid by applying the transformation matrix o s - x s y s z s to both the coordinate axes and the angles D m d y and D m d z.
The RBFNN can efficiently approximate any function with infinite accuracy, making it a good choice to fit the target measurement error distribution of a two-axis electro-optical sensor. The proposed active compensation technique can significantly improve the target measurement accuracy of the equipment. In addition, the RBFNN can also effectively suppress the random error space surface and increase the measurement accuracy of a two-axis electro-optical infrared sensor.
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