Dual-band Infrared And Geomagnetic Attitude Measurement And Infrared Interference Compensation

In recent years,the contention among the countries in the Asia-Pacific coastal areas around territorial sovereignty and marine resources has become increasingly fierce,and the arms race in maritime forces has been intensifying.Previous local wars have shown that ammunition without precision strike capability has no foothold in the future era of information warfare.It is of great significance to study the attitude parameter measurement theory and method to improve the new shipborne guided projectiles and conventional ammunition precision strike capability.Dual-band infrared and geomagnetic combined attitude measurement technology has the advantages of low cost,high precision,high anti-interference ability,small size,solid state structure,without drift and cumulative error,no need for initial alignment,etc.It has important practical significance for improving the precision strike capability of the shipborne intelligent ammunition.The basic theory of dual-band sea-sky infrared radiation is studied,and the missile-borne dual-band infrared radiation attitude measurement model is established.The reasonable dualband infrared sensors arrangement method and solution method are designed.The sun,cloud layer,atmospheric turbulence and the missile body infrared radiation interference under the sea and sky background are analyzed,and the infrared radiation error compensation method in dualband missile attitude measurement is carried out.A dual-band infrared and geomagnetic fusion algorithm for spinning projectile attitude measurement is designed by combining the two-band infrareds and geomagnetic sensors.The hardware-in-the-loop simulation experiments are carried out to verify the effectiveness of the dual-band infrared and magnetic fusion attitude measurement method and infrared interference compensation algorithm.Main research work can be summed up in the following aspects:(1)Based on the infrared radiation basic theory,the generation mechanism of infrared radiation field in sea-sky background is analyzed.Through the static sea surface model,the relationship between the sea surface infrared radiation brightness and ground inclination angle is obtained.The transmission and absorption stratification theory is used to analyze the atmosphere long-wave(8?14?m)and medium-wave(3?5?m)infrared radiation propagation law.The theoretical model of dual-band sea-sky infrared radiation is constructed by using Planck's blackbody radiation law.The variation law of dual-band sea-sky infrared radiation with ground inclination angle is obtained,which provides a theoretical basis for the establishment of missile-borne dual-band infrared radiation attitude measurement model.(2)According to the infrared sensor measurement principle,the missile-borne infrared sensor theoretical measurement model is established.Combined with the spinning projectile motion characteristics,a dual-band two-axis infrared sensors combination array is designed on the projectile coordinate system,which avoids the conventional three-axis infrared sensor installation method that needs to open a hole at the head of the projectile.Based on the error transfer theory,the the two-axis infrared sensor's optimal attitude angle is given.The advantages and disadvantages of the two-axis and three-axis infrared sensor solution methods are compared and analyzed.(3)The environmental disturbances in the sea-sky infrared attitude measurement are analyzed.The solar infrared radiation influence on dual-band infrared attitude measurement is calculated and statistically analysed by using MODTRAN,and designed the attitude calculation method under day and night conditions.The cloud infrared radiation interference theoretical measurement model is established by using the gray body approximation theory,and the dualband infrared radiation difference compensation algorithm is designed.The infrared radiation path model and the infrared radiation intensity weakening model under the turbulence influence are respectively established.The projectile surface temperature and infrared radiation characteristics are studied,and the projectile infrared radiation model is established to analyze the infrared sensor measurement error.(4)A combined attitude measuremnt method using data fusion of dual-band two-axis infrared sensor and three-axis geomagnetic sensor is proposed to solve the rotating projectile full attitude angle.The integral ratio attitude measurement algorithm using the three orthogonal geomagnetic sensor is designed.Statistical feature ratio is used to replace single point feature ratio,which improves the accuracy of independent geomagnetic attitude calculation.An interactive multi-model extended Kalman filter attitude estimation algorithm is designed.When encountering infrared or geomagnetic anomalies,the probability of filtering models can be updated in time,and the attitude measurement accuracy of dual-band infrared and geomagnetic fusion is improved.The feasibility of the algorithm is verified by numerical simulation analysis.(5)A dual-band infrared and geomagnetic attitude measurement system is developed and the static performance is carried out.The three-axis turntable is used to simulate the spinning projectile attitude change.The water-patterned paper is used to simulate static sea surface.The semi-physical experimental study on the dual-band infrared and geomagnetic combination attitude measurement and infrared radiation interference compensation technology under seasky environment are carried out.The experimental results show that the dual-band infrared and geomagnetic fusion attitude measurement and interference compensation method are effective and robust.