Research On High-resolution One-dimensional Range Imaging Technique Of Missile-borne Millimeter Wave

Accurate guidance technology is mainly used to detect,track and identify targets from complex battlefield environments to achieve accurate guidance of the targets.Which occupies an increasingly important position in the modern era.In order to improve the accuracy of hits,the key is to perform high-resolution imaging on the target and analyze its shape and key parts.For this application requirement,the characteristics of the missile-borne millimeter-wave radar system are studied in this paper.The causes and effects of the error of the missile-borne millimeter-wave radar system,the influence of the Doppler of relative movement and the redundant information are analyzed.A high-resolution one-dimensional distance imaging method based on amplitude-phase correction,high-speed motion compensation and de-redundancy is proposed.Its main contents and innovations are as follows:(1)The ‘Time-domain amplitude-phase correction method' and ‘All-phase FFT phase measurement method' are introduced in view of the characteristics of the missile-borne millimeter-wave radar system's transceiving channel.The inconsistency of the receive and transmit channels of the missile-borne millimeter-wave radar system is solved from the perspective of signal processing.Firstly,by in-depth study of the effects of amplitude inhomogeneity,phase non-orthogonality,and DC offset of the missile-borne millimeter-wave radar system on the effect of the high-resolution one-dimensional range image,the amplitude-phase correction method is proposed.Then,for the amplitude and phase errors of the signal among the various frequency points,which are caused by the AD-chip's transceiving local oscillator and frequency hopping,a amplitude-phase correction method among frequency points based on the‘All-phase FFT phase measurement method' is proposed.(2)According to the phenomenon of target echo's movement across the distance units and the range-Doppler coupling phenomenon caused by the high-speed relative motion of the projectile,a motion compensation method based on the ‘Wide-range Doppler velocity measurement method' is proposed to significantly improve the effect of the one-dimensional range imaging.First,the influence of target echo across the distance unit on the effect of the high-resolution one-dimensional range image is analyzed and discussed.Based on the ‘Wide-range Doppler velocity measurementmethod',the ‘frequency domain envelope compensation method' is proposed to make the package center alignment.In addition,in-depth analysis of the impact of the echo phase change of fast target on the high-resolution one-dimensional range image,the‘time domain phase compensation method' is proposed to make the phase linear.(3)Based on the residual velocity error of the high-speed projectile motion compensation and the redundant target information of the adjacent distance unit,the‘Weighted range image mosaic algorithm based on the velocity compensation error' is proposed.By analyzing the causes of the redundant information in the radar signal processing system and its effect on the high-resolution one-dimensional range imaging effect,taking into account the speed compensation error after high-speed motion compensation,the neighboring distance units are weighted for information processing.and splicing.A high-resolution one-dimensional range image splicing method with certain speed compensation error tolerance and redundant information removal effect is realized(4)Based on the FPGA hardware architecture,the signal processing process of the high-resolution one-dimensional range image is realized.Through the pipelined and time division multiplexed work methods to achieve signal processing,the use of resources is greatly reduced.At the same time,several key operational function modules are elaborated and functional simulation verification is attached.