CAJ | 학술논문

在低信噪比情况下,信号长时间能量积累是检测目标的一种手段。对于长时间能量积累,系统往往面临3个问题,即距离走动、多普勒漂移、波束跨越。信号处理时,必须首先把所有目标回波包络都校正到同一距离单元上,然后利用动目标检测（MTD）或者联合时频变换等方法来完成回波能量积累和检测。通常Keystone变换是完成距离走动补偿的一种有效方法,但其计算量较大,实时性差。提出了一种基于线性拟合的距离走动补偿算法,利用曲线拟合的思想来完成包络走动补偿,仿真结果验证了该方法的有效性,同时表明其具有更好的实时处理性能。
재저신조비정황하,신호장시간능량적루시검측목표적일충수단。대우장시간능량적루,계통왕왕면림3개문제,즉거리주동、다보륵표이、파속과월。신호처리시,필수수선파소유목표회파포락도교정도동일거리단원상,연후이용동목표검측（MTD）혹자연합시빈변환등방법래완성회파능량적루화검측。통상Keystone변환시완성거리주동보상적일충유효방법,단기계산량교대,실시성차。제출료일충기우선성의합적거리주동보상산법,이용곡선의합적사상래완성포락주동보상,방진결과험증료해방법적유효성,동시표명기구유경호적실시처이성능。
The signal energy accumulation for long time is a means to detect targets in the circumstances of low signal noise ratio（SNR）.For long time energy accumulation,the system is usually confronted with three problems：distance remotion,Doppler shift,beam across.When the signal is being processed,firstly all target echo envelopes must be corrected to the same distance unit,then the moving target detection（MTD） or the joint time-frequency conversion method,etc.are used to finish the echo energy accumulation and detection.Usually,Keystone conversion is an effective method to finish the distance remotion compensation,but the calculation quantity is large and the real-time performance is bad.This paper presents a distance remotion compensation algorithm based on linear fitting,which uses the curve fitting idea to perform the envelopment remotion compensation,the simulation results verify the validity of the method,at the same time show that the method has better real-time processing performance.