CAJ | 학술논문

小波变换在信号处理方面的优势越来越明显,但是小波中的小波基不是唯一的,所以采用不同的小波基即使处理同一组数据其结果也会不同。为了确定那种小波基更适合于大光斑激光雷达,通过对MATLAB中常用的小波基参数特性的比较分析最终确定选用Daubechies小波基和Symlets小波基,并分别通过对ICESAT-GLAS波形进行小波分解、阈值处理和小波重构来实现波形去噪过程。结果表明：用Symlets小波基中的sym7小波基比用Daubechies小波基中的db1小波基去噪后波形信噪比要高,而均方根误差则比用Daubechies小波基中的db1小波基的低,由此看来Symlets小波基中sym7小波基更适合于处理大光斑激光雷达波形数据。
소파변환재신호처리방면적우세월래월명현,단시소파중적소파기불시유일적,소이채용불동적소파기즉사처리동일조수거기결과야회불동。위료학정나충소파기경괄합우대광반격광뢰체,통과대MATLAB중상용적소파기삼수특성적비교분석최종학정선용Daubechies소파기화Symlets소파기,병분별통과대ICESAT-GLAS파형진행소파분해、역치처리화소파중구래실현파형거조과정。결과표명：용Symlets소파기중적sym7소파기비용Daubechies소파기중적db1소파기거조후파형신조비요고,이균방근오차칙비용Daubechies소파기중적db1소파기적저,유차간래Symlets소파기중sym7소파기경괄합우처리대광반격광뢰체파형수거。
The advantage of wavelet transform on signal processing is increasingly obvious.Since the wavelet basis isn't unique,the results derived from the same data by different wavelet basis may be various.In order to know which wavelet basis is appropriate for ICESAT-GlAS data,this paper chooses Daubechies wavelet basis and Symlets wavelet basis according to the comparison and analysis on the characteristics of eight common wavelet basis parameters in MATLAB,and achieves the denoised wave by the decomposition,setting threshold function,and re-constructing to the data about the shape of echo wave from ICESAT-Glas.The conclusions are the SNR of the data processing using Sym7 of Symlets wavelet basis is higher than that using db1 of Daubechies wavelet basis,while the RMS error is lower than that using db1.Thus,Sym7 wavelet is the right one to process the data of ICESAT-GlAS.