Quadrature Compressive Sampling for Radar Signals
Quadrature Compressive Sampling for Radar Signals
复制标题
雷达信号的正交压缩采样
DOI：
10.1109/tsp.2014.2315168
复制
发表时间：
2014-01
影响因子：
5.4
通讯作者：
Liu, Zhong
中科院分区：
文献类型：
--
作者：
Xi, Feng;Chen, Shengyao;Liu, Zhong
正交采样在相干雷达系统中被广泛应用，以提取接收到的雷达信号中的同相和正交（I和Q）分量。然而，采样是低效的，因为所接收的信号仅包含少量的有效目标信号。将压缩采样（CS）理论引入正交采样系统的设计中，设计了一种正交压缩采样（QuadCS）系统，实现了低采样率下I、Q分量的采集。QuadCS系统首先将接收到的信号随机地投影成压缩带通信号，然后利用正交采样来输出压缩I和Q分量。压缩输出用于重建I和Q分量。为了理解系统性能，我们建立了QuadCS系统的频域表示。利用波形匹配字典，我们证明了QuadCS系统以压倒性的概率满足约束等距性。对于观测间隔T中的K个目标信号，仿真表明QuadCS仅需要O（Klog（BT/K））个样本来稳定地重建信号，其中B是信号带宽。对于目标数目K中的每一个倍频程增加，重建的信噪比降低3dB，并且对于压缩带宽中的每一个倍频程增加，重建的信噪比增加3dB。理论分析和仿真结果表明，该系统是一种有效的雷达信号I、Q分量提取系统。
Quadrature sampling has been widely applied in coherent radar systems to extract in-phase and quadrature ( I and Q) components in the received radar signal. However, the sampling is inefficient because the received signal contains only a small number of significant target signals. This paper incorporates the compressive sampling (CS) theory into the design of the quadrature sampling system, and develops a quadrature compressive sampling (QuadCS) system to acquire the I and Q components with low sampling rate. The QuadCS system first randomly projects the received signal into a compressive bandpass signal and then utilizes the quadrature sampling to output compressive I and Q components. The compressive outputs are used to reconstruct the I and Q components. To understand the system performance, we establish the frequency domain representation of the QuadCS system. With the waveform-matched dictionary, we prove that the QuadCS system satisfies the restricted isometry property with overwhelming probability. For K target signals in the observation interval T, simulations show that the QuadCS requires just O(Klog(BT/K)) samples to stably reconstruct the signal, where B is the signal bandwidth. The reconstructed signal-to-noise ratio decreases by 3 dB for every octave increase in the target number K and increases by 3 dB for every octave increase in the compressive bandwidth. Theoretical analyses and simulations verify that the proposed QuadCS is a valid system to acquire the I and Q components in the received radar signals.
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影响因子：
2.3
作者：
M. Talagrand
通讯作者：
M. Talagrand
DOI：
10.1137/100785028
发表时间：
2011-10
期刊：
SIAM J. Optim.
影响因子：
--
作者：
E. Berg;M. Friedlander
通讯作者：
E. Berg;M. Friedlander
DOI：
10.1017/cbo9780511794308
发表时间：
2012
期刊：
--
影响因子：
--
作者：
Gitta Kutyniok
通讯作者：
Gitta Kutyniok
DOI：
10.1109/milcom.2010.5680110
发表时间：
2010-10
期刊：
2010 - MILCOM 2010 MILITARY COMMUNICATIONS CONFERENCE
影响因子：
--
作者：
T. Petros;M. Salman Asif
通讯作者：
T. Petros;M. Salman Asif
DOI：
10.1090/surv/089
发表时间：
2001
期刊：
--
影响因子：
--
作者：
M. Ledoux
通讯作者：
M. Ledoux