CAJ | 학술논문

临近空间慢速平台合成孔径雷达成像效率低，本文提出一种方位向多波束切换成像模式，实现其对地面区域的快速成像。其基本思路为将方位向测绘带划分为多个子测绘带。同时将所需方位向采样率提高相应倍数。在方位向各采样点周期性的照射方位向各子测绘带。对比传统条带成像模式，本文提出模式可有效提高慢速平台成像效率。当方位向子波束个数足够大时，其方位向成像效率可快于快速平台。所提出的成像模式可同时实现对地面的高分辨率宽测绘带成像。本文给出了系统设计关键参数的计算公式及信号处理流程。仿真结果验证了本文提出成像模式及信号处理流程的有效性。
림근공간만속평태합성공경뢰체성상효솔저，본문제출일충방위향다파속절환성상모식，실현기대지면구역적쾌속성상。기기본사로위장방위향측회대화분위다개자측회대。동시장소수방위향채양솔제고상응배수。재방위향각채양점주기성적조사방위향각자측회대。대비전통조대성상모식，본문제출모식가유효제고만속평태성상효솔。당방위향자파속개수족구대시，기방위향성상효솔가쾌우쾌속평태。소제출적성상모식가동시실현대지면적고분변솔관측회대성상。본문급출료계통설계관건삼수적계산공식급신호처리류정。방진결과험증료본문제출성상모식급신호처리류정적유효성。
The imaging efficiency of the synthetic aperture radar installed in near space slow platform is low.In this pa-per an imaging mode based on the azimuth multi-beam switching is proposed.The basic idea is to divide the azimuth swath into multiple azimuth sub-swaths.The required pulse repeated frequency is increased accordingly.In the azimuth sampling positions,the azimuth sub-swaths are illuminated periodically.In contrast to the traditional stripmap mode,the proposed mode can improve the imaging efficiency effectively.When the number of the multi-beam is large enough,the imaging effi-ciency of the slow platform can be higher than that of the fast platform.The high resolution wide swath imaging,mean-while,can be achieved.The formulas for calculating the key parameters of the system as well as the signal processing steps are provided.The simulation results verify the validity of the proposed imaging mode and signal processing steps.