Research On High Precision Strategy Of Radar Wave Refraction Correction

The radar commonly used in modern military relies on the reflection of electromagnetic waves to achieve the purpose of target positioning and speed measurement.The electromagnetic waves propagating in the atmosphere are affected by the uneven medium to produce a refraction effect,which in turn affects the accuracy of the radar's speed measurement.In order to improve the radar positioning speed Accuracy must be corrected for atmospheric refraction errors.Aiming at the current situation that the accuracy and speed of correction of radio wave refraction error can not meet the requirements of high-precision radar detection,it is urgent to give a high-precision strategy for radar wave refraction correction.Firstly,through the comparison and analysis of several commonly used atmospheric profile models and refractive error correction algorithms,the well-accurate segmented atmospheric model and radio-ray ray tracing correction algorithm are selected.Secondly,the high-precision strategy of radar wave refraction correction is studied in detail.In the accurate acquisition of atmospheric refractive index profile,the first is the refractive index on the radio wave ray caused by the atmospheric interpolation linear interpolation method commonly used in atmospheric profile treatment.In the case of large error,according to the law of atmospheric refractive index change,a segmental atmospheric refractive index interpolation method is proposed.Secondly,a combination method for obtaining the atmospheric refractive index profile is proposed for the complex area of the underlying surface.By using the atmospheric refractive index measured data for linear interpolation and piecewise interpolation,and the refractive index of the radio wave obtained from the national atmospheric profile model database established by the combination method is compared,which proves that the method can accurately obtain the wave.The refractive index of the atmosphere on the ray.In the high-precision research on the calculation method of radio wave refraction correction under the premise of ensuring accuracy,the first is to propose an improved algorithm based on virtual height.By using the virtual height method close to the true height of the target,the calculation of the upper limit of the integral based on the integral method is greatly improved.The reduction is greatly improved the calculation speed.Secondly,the method of transforming the integral calculation into differential calculation is proposed to improve the calculation speed,and then the improved step size algorithm based on the differential method is obtained.Through MATLAB simulation comparison,it is proved that both methods can effectively improve the calculation speed of radio wave refraction error correction.Finally,aiming at the low precision of radar refraction parameter refraction correction,a high-precision correction method for obtaining velocity refraction error from time difference and direction cosine is proposed.The simulation analysis shows that the method can effectively improve the accuracy of velocity radiance correction.The comprehensive improvement of these three aspects can further ensure the high-precision positioning speed of the radar.The research results in this paper not only give a practical one-dimensional and three-dimensional cross-section processing method for correcting the radar wave refraction error correction atmospheric profile,which can effectively improve the accuracy of radio wave refraction correction,and thus ensure the high-precision detection of radar.At the same time,the optimization algorithm of radio wave refraction error correction and the method of refraction error correction of radar velocimetry parameters are proposed,which not only ensures the correction accuracy but also greatly increases the calculation speed,so that the refraction error correction effect can be achieved with high precision and fast.This result can be directly applied to the in-service radar system to further improve its positioning accuracy.