在非合作接收场景中,对于一些特殊信号,在输出目标数据时会产生脉冲分裂现象,使得无法及时掌握目标真实参数。这是由于脉冲内部的幅度存在起伏,当信号到达接收设备时,同一脉冲幅度高的位置超过了接收设备灵敏度,幅度低的位置未达到灵敏...在非合作接收场景中,对于一些特殊信号,在输出目标数据时会产生脉冲分裂现象,使得无法及时掌握目标真实参数。这是由于脉冲内部的幅度存在起伏,当信号到达接收设备时,同一脉冲幅度高的位置超过了接收设备灵敏度,幅度低的位置未达到灵敏度造成的。针对这一问题,本文以脉内线性调频的雷达信号为例,深入分析了雷达脉冲分裂信号的内在规律,并在此基础上提出了分选与参数估计方法。本方法首先基于脉冲流的到达时间差分(differenceoftimeofarrival,DTOA)、频率(radiofrequency,RF)和脉冲宽度(pulse width, PW),利用双向长短时记忆网络(bidirectional long short-term memory,BLSTM),学习信号复杂的内在规律,提取多个参数之间的耦合关系,进而将属于同一目标的分裂脉冲从脉冲流中分选出来;再结合波形设计原理,基于分选后脉冲流的到达时间(time of arrival, TOA)、RF和PW,通过聚类和类间估计结果共享,反演得到雷达信号真实参数。仿真结果表明,本文所提的分选方法对于脉内线性调频的雷达脉冲分裂信号,具有极佳的分选效果;本文的参数估计方法,基于分选后的脉冲流数据,对原始信号斜率、RF、PW和PRI都有理想的估计结果。展开更多
Bistatic SAR（Bi SAR）with illuminators of opportunity is a kind of flexible SAR system that consists of non-cooperative transmitters and a stationary or moving receiver,as Figure 1shows.In recent years,notable effort...Bistatic SAR（Bi SAR）with illuminators of opportunity is a kind of flexible SAR system that consists of non-cooperative transmitters and a stationary or moving receiver,as Figure 1shows.In recent years,notable efforts have been made to promote the development of this kind of system.Progress regarding Bi SAR with navigation satellites as transmitters before 2015,including the related theory and practice,has been well reviewed by Antoniou et al.and can be referred from[1].This paper reviews some of the progress in 2015and 2016,including novel signal processing approaches,advanced Bi SAR system configurations and potentially展开更多
文摘在非合作接收场景中,对于一些特殊信号,在输出目标数据时会产生脉冲分裂现象,使得无法及时掌握目标真实参数。这是由于脉冲内部的幅度存在起伏,当信号到达接收设备时,同一脉冲幅度高的位置超过了接收设备灵敏度,幅度低的位置未达到灵敏度造成的。针对这一问题,本文以脉内线性调频的雷达信号为例,深入分析了雷达脉冲分裂信号的内在规律,并在此基础上提出了分选与参数估计方法。本方法首先基于脉冲流的到达时间差分(differenceoftimeofarrival,DTOA)、频率(radiofrequency,RF)和脉冲宽度(pulse width, PW),利用双向长短时记忆网络(bidirectional long short-term memory,BLSTM),学习信号复杂的内在规律,提取多个参数之间的耦合关系,进而将属于同一目标的分裂脉冲从脉冲流中分选出来;再结合波形设计原理,基于分选后脉冲流的到达时间(time of arrival, TOA)、RF和PW,通过聚类和类间估计结果共享,反演得到雷达信号真实参数。仿真结果表明,本文所提的分选方法对于脉内线性调频的雷达脉冲分裂信号,具有极佳的分选效果;本文的参数估计方法,基于分选后的脉冲流数据,对原始信号斜率、RF、PW和PRI都有理想的估计结果。
基金supported by the National Natural Science Foundation of China(Grant Nos.61120106004,61427802,61225005,61601031)ChangJiang Scholars Program(Grant No.T2012122)111 project of China(Grant No.B14010)
文摘Bistatic SAR（Bi SAR）with illuminators of opportunity is a kind of flexible SAR system that consists of non-cooperative transmitters and a stationary or moving receiver,as Figure 1shows.In recent years,notable efforts have been made to promote the development of this kind of system.Progress regarding Bi SAR with navigation satellites as transmitters before 2015,including the related theory and practice,has been well reviewed by Antoniou et al.and can be referred from[1].This paper reviews some of the progress in 2015and 2016,including novel signal processing approaches,advanced Bi SAR system configurations and potentially
