Abstract
The measurement of the phase center of the airborne array antenna can directly affect the accuracy of the Earth observation system. However, the relationship between the relative motion of each sub-antenna cannot be accurately measured because of the adverse environment of the airborne platform. Therefore, it is necessary to find a suitable method to measure the motion parameters of distributed antennas and the phase center of each element antenna accurately in order to improve the imaging resolution of the Earth observation system. Distributed position and orientation system (POS) technology has high precision, but its measurement error will accumulate with time. So it needs to transfer and align continuously to achieve high-precision measurement. The paper introduces the distributed measurement method of measuring the array antenna position based on the combination of fiber Bragg grating (FBG) sensing technology and POS technology on the aircraft wing. The paper first introduces the technical scheme and principle, then carries out the structural design and method analysis. Next, the structural strength of the experimental model is checked and summarized.
Highlights
The synthetic aperture radar (SAR) was first developed in the 1950s and used in the Earth observation system of airborne platforms [1]
The method combines position and orientation system (POS) technology [13,14] and fiber Bragg grating (FBG) sensor technology, which is helpful to improve the accuracy of measuring the phase center of array antenna
M where, as is the attitude of the subsystem in navigation coordinates, a m is the attitude angle of the main system after the conversion of the deflection angle at the load point measured by the FBG, which can be obtained by the inverse solution of the attitude transfer matrix Cnb m = Cθ Cnb m
Summary
The synthetic aperture radar (SAR) was first developed in the 1950s and used in the Earth observation system of airborne platforms [1]. Distributed position and orientation system (POS) technology is mainly based on the airborne-distributed inertial measurement system. By sharing the information of flight control, attitude reference or navigation system on the carrier, several high-precision inertial measurement units (IMU) are arranged to form a complete set of airborne inertial navigation system networks. The airborne distributed measurement technology is mainly used in initial attitude alignment of air-based missiles before launch and the relative motion information measurement of radar motion compensation. As a minimum distributed system including two sets of inertial navigation system (INS), the accuracy of sub-INS is guaranteed by fast transfer alignment technology. In order to obtain the phase center of the array antenna accurately, it is necessary to measure the deformation of the aircraft wing accurately.
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