实验科学与技术
實驗科學與技術
실험과학여기술
EXPERIMENT SCIENCE AND TECHNOLOGY
2012年
1期
6-9
,共4页
S变换%瞬时频率%广义S变换%超视距雷达
S變換%瞬時頻率%廣義S變換%超視距雷達
S변환%순시빈솔%엄의S변환%초시거뢰체
S-transform%instantaneous frequency%generalized S-transform%OTHR
研究了基于S变换的电离层相位去污染算法,针对S变换瞬时频率估计存在对低频估计性能较差的问题,提出了基于广义S变换电离层去污染算法,并将该算法应用于超视距雷达的电离层相位去污染中。实验结果显示,相比其他方法,如最大熵谱估计算法、伪Wigner-Ville分布电离层相位去污染算法、改进的自适应短时傅里叶变换方法等,文中提出的方法在低复杂度条件下可以得到更好的去污染性能。
研究瞭基于S變換的電離層相位去汙染算法,針對S變換瞬時頻率估計存在對低頻估計性能較差的問題,提齣瞭基于廣義S變換電離層去汙染算法,併將該算法應用于超視距雷達的電離層相位去汙染中。實驗結果顯示,相比其他方法,如最大熵譜估計算法、偽Wigner-Ville分佈電離層相位去汙染算法、改進的自適應短時傅裏葉變換方法等,文中提齣的方法在低複雜度條件下可以得到更好的去汙染性能。
연구료기우S변환적전리층상위거오염산법,침대S변환순시빈솔고계존재대저빈고계성능교차적문제,제출료기우엄의S변환전리층거오염산법,병장해산법응용우초시거뢰체적전리층상위거오염중。실험결과현시,상비기타방법,여최대적보고계산법、위Wigner-Ville분포전리층상위거오염산법、개진적자괄응단시부리협변환방법등,문중제출적방법재저복잡도조건하가이득도경호적거오염성능。
This paper analyzes the instantaneous frequency(IF) estimation properties of S-Transform(ST) and proposes the reason of the poor estimation performance for ST at low frequencies.A generalized S-Transform(GST) which has better performance than the ST at low frequencies is therefore introduced in the IF estimation.GST is applied in the phase contamination correction of over-the-horizon-radar(OTHR) in this paper.Through the comparisons on the calculation complex and the effectiveness of contamination correction with the maximum entropy spectrum analysis(MESA),Pseudo Wigner-Ville Distribution(PWVD) method and the Modified Adaptive Short Time Fourier Transform(MASTFT) method in the referred literatures,the GST method used in this paper has much better performance.