Using super resolution direction of arrival（DOA） estimation algorithm to reduce the resolution angle is an effective method for passive radar seeker（PRS） to antagonize non-coherent radar decoy.Considering the powe...Using super resolution direction of arrival（DOA） estimation algorithm to reduce the resolution angle is an effective method for passive radar seeker（PRS） to antagonize non-coherent radar decoy.Considering the power and correlation property between radar and non-coherent decoy,an improved subspace DOA estimation method based on traditional subspace algorithm is proposed.Because this new method uses the invariance property of noise subspace,compared with traditional MUSIC algorithm,it shows not only better resolution in condition of closely spaced sources,but also superior performance in case of different power or partially correlated sources.Using this new method,PRS can distinguish radar and non-coherent decoy with good performance.Both the simulation result and the experimental data confirm the performance of the method.展开更多
This paper analyzes the effect of waveform parame- ters on the joint target location and velocity estimation by a non- coherent multiple input multiple output （MIMO） radar transmitting multiple subcarriers signals. ...This paper analyzes the effect of waveform parame- ters on the joint target location and velocity estimation by a non- coherent multiple input multiple output （MIMO） radar transmitting multiple subcarriers signals. How the number of subcarriers in- fluences the estimation accuracy is illustrated by considering the joint Cramer-Rao bound and the mean square error of the maxi- mum likelihood estimate. The non-coherent MIMO radar ambiguity function with multiple subcarriers is developed and investigated by changing the number of subcarriers, the pulse width and the frequency spacing between adjacent subcarriers. The numerical results show that more subcarriers mean more accurate estimates, higher localization resolution, and larger pulse width results in a worse performance of target location estimation, while the fre- quency spacing affects target location estimation little.展开更多
为提高射频识别(radio frequency identification,RFID)标签的吞吐量并减少系统的复杂度,针对被动式RFID标签识别系统,提出了3种新的标签防冲突协议,分别是动态二进制树时隙协议、自适应二进制树时隙协议和分裂二进制树时隙协议.这3种...为提高射频识别(radio frequency identification,RFID)标签的吞吐量并减少系统的复杂度,针对被动式RFID标签识别系统,提出了3种新的标签防冲突协议,分别是动态二进制树时隙协议、自适应二进制树时隙协议和分裂二进制树时隙协议.这3种协议均采用二进制树时隙的算法,即标签先随机选择时隙,如果发生冲突,则冲突的标签立即执行二进制树分解,而其余的标签等待,直到分解结束再识别等待的标签.其最大优点在于无需估计标签,可减少系统的复杂度,同时,又能保持较高的识别标签的吞吐量,而且吞吐量不受标签的变化影响.从仿真结果看,所提出的3种RFID标签防冲突协议的最大识别的吞吐量能达到0.425,高于传统的动态帧时隙Aloha协议、树时隙类Aloha协议,并且当标签在5～1000时,识别吞吐量未产生大的波动.展开更多
文摘Using super resolution direction of arrival（DOA） estimation algorithm to reduce the resolution angle is an effective method for passive radar seeker（PRS） to antagonize non-coherent radar decoy.Considering the power and correlation property between radar and non-coherent decoy,an improved subspace DOA estimation method based on traditional subspace algorithm is proposed.Because this new method uses the invariance property of noise subspace,compared with traditional MUSIC algorithm,it shows not only better resolution in condition of closely spaced sources,but also superior performance in case of different power or partially correlated sources.Using this new method,PRS can distinguish radar and non-coherent decoy with good performance.Both the simulation result and the experimental data confirm the performance of the method.
基金supported by the National Natural Science Foundation of China (60972152 61001153)the Aeronautics Science Foundation of China (2009ZC53031)
文摘This paper analyzes the effect of waveform parame- ters on the joint target location and velocity estimation by a non- coherent multiple input multiple output （MIMO） radar transmitting multiple subcarriers signals. How the number of subcarriers in- fluences the estimation accuracy is illustrated by considering the joint Cramer-Rao bound and the mean square error of the maxi- mum likelihood estimate. The non-coherent MIMO radar ambiguity function with multiple subcarriers is developed and investigated by changing the number of subcarriers, the pulse width and the frequency spacing between adjacent subcarriers. The numerical results show that more subcarriers mean more accurate estimates, higher localization resolution, and larger pulse width results in a worse performance of target location estimation, while the fre- quency spacing affects target location estimation little.
文摘为提高射频识别(radio frequency identification,RFID)标签的吞吐量并减少系统的复杂度,针对被动式RFID标签识别系统,提出了3种新的标签防冲突协议,分别是动态二进制树时隙协议、自适应二进制树时隙协议和分裂二进制树时隙协议.这3种协议均采用二进制树时隙的算法,即标签先随机选择时隙,如果发生冲突,则冲突的标签立即执行二进制树分解,而其余的标签等待,直到分解结束再识别等待的标签.其最大优点在于无需估计标签,可减少系统的复杂度,同时,又能保持较高的识别标签的吞吐量,而且吞吐量不受标签的变化影响.从仿真结果看,所提出的3种RFID标签防冲突协议的最大识别的吞吐量能达到0.425,高于传统的动态帧时隙Aloha协议、树时隙类Aloha协议,并且当标签在5～1000时,识别吞吐量未产生大的波动.
