Polarization grating navigation sensor

Abstract

The invention provides a polarization grating navigation sensor which mainly comprises a polarization grating detecting array, an image sensor, a signal amplifying, filtering and conditioning part, a voltage signal acquiring and processing part, a direction angle resolving and outputting part and the like. The polarization grating navigation sensor is in optical, mechanical and electronic integration design; by selecting a specific band-pass filter, a polarization grating detection array and a CMOS photoelectric detection array, the problem of low time and space resolution of the polarization grating navigation sensor is solved and the angle measurement accuracy and resolution of the polarization grating navigation sensor are improved; and simultaneously, a practical angle resolving method is used for eliminating the influence of the change of the polarization degree of sky polarization light on the angle measurement accuracy of the sensor. The invention has the advantages of simple structure, reliable performance and high angle measurement accuracy.

Description

technical field [0001] The invention relates to the field of heading angle measuring devices, in particular to a navigation sensor which utilizes a relatively stable polarized light distribution pattern in the atmosphere to measure angular displacement. Background technique [0002] In the current attitude angle measurement sensor system, it mainly includes geomagnetic compass, inertial gyroscope and star sensor. The geomagnetic compass has a simple principle and structure, but its accuracy is low; the inertial gyroscope has high instantaneous accuracy, but it has a large accumulated error after long-term use; the GPS system is characterized by all-weather, high precision, automation, high efficiency and its unique positioning Navigation, time service and frequency correction, precision measurement and other powerful functions, but the GPS system completely relies on electromagnetic communication with satellites and is susceptible to electromagnetic interference. Stellar se...

AI Technical Summary

Problems solved by technology

The geomagnetic compass has a simple principle and structure, but its accuracy is low; the inertial gyroscope has high instantaneous accuracy, but it has a large accumulated error after long-term use; the GPS system is characterized by all-weather, high precision, automation, high efficiency and its unique positioning It has many powerful functions such as navigation, time service and frequency correction, precision measurement, etc. However, the GPS system completely relies on electromagnetic communication with satellites and is susceptible to electromagnetic interference

Stellar sensors have high measurement accuracy, relatively complex principles, extremely high computing performance requirements, and high cost, so they are subject to many restrictions in navigation engineering applications

[0003] The existing polarization grating navigation sensor device has disadvantages: three polarization main direction analyzers are used to form the polarization direction detection head. When one polarization main direction analyzer is blocked or damaged, it is easy to cause the performance of the entire sensor to decline or fail

Because it uses point photodetectors to detect polarization information with a wide field of view, the spatial detection resolution of the sky polarization direction mode is relatively low, and the heading angle measurement accuracy is relatively low

Images