航空计算技术
航空計算技術
항공계산기술
AERONAUTICAL COMPUTER TECHNIQUE
2015年
4期
90-92,100
,共4页
雷达回波%直升机目标%S变换%特征提取
雷達迴波%直升機目標%S變換%特徵提取
뢰체회파%직승궤목표%S변환%특정제취
radar echo%helicopter target%S transform%feature extraction
S变换吸收并发展了短时傅里叶变换和连续小波变换，在对非平稳信号进行分析时具有独特优势。利用S变换在时频域对包含旋翼旋转的直升机雷达回波信号进行了分析，通过仿真验证，得到了直升机旋翼运动特征。比较了几种常见时频分析工具的变换结果及性能差异，仿真结果表明，S变换方法在分析直升机旋翼的调制特性方面是可行而稳健的，这对直升机目标的识别具有重要的价值。
S變換吸收併髮展瞭短時傅裏葉變換和連續小波變換，在對非平穩信號進行分析時具有獨特優勢。利用S變換在時頻域對包含鏇翼鏇轉的直升機雷達迴波信號進行瞭分析，通過倣真驗證，得到瞭直升機鏇翼運動特徵。比較瞭幾種常見時頻分析工具的變換結果及性能差異，倣真結果錶明，S變換方法在分析直升機鏇翼的調製特性方麵是可行而穩健的，這對直升機目標的識彆具有重要的價值。
S변환흡수병발전료단시부리협변환화련속소파변환，재대비평은신호진행분석시구유독특우세。이용S변환재시빈역대포함선익선전적직승궤뢰체회파신호진행료분석，통과방진험증，득도료직승궤선익운동특정。비교료궤충상견시빈분석공구적변환결과급성능차이，방진결과표명，S변환방법재분석직승궤선익적조제특성방면시가행이은건적，저대직승궤목표적식별구유중요적개치。
The S transform absorbs and develops the features of short -time Fourier transform and contin-uous wavelet transform .Its good nature makes this time-frequency analysis method have a unique advan-tage in non-stationary signal analysis .In this paper ,S transform is used to analyze helicopter radar echo signal through simulation ,and the characteristics of the movement of helicopter rotor blade is obtained . The paper compares the transformation results and performances of several common frequency analysis methods ,and the simulation results show that the S transform method is feasible and prudent in analyzing modulation characteristics of the helicopter rotor blade ,which is of great value to target identification and recognition of the helicopter .
