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| 1 | Monopulse instantaneous 3D imaging for wideband radar system显示文摘To avoid the complicated motion compensation in interferometric inverse synthetic aperture(InISAR)and achieve realtime three-dimensional(3 D)imaging,a novel approach for 3 D imaging of the target only using a single echo is presented.This method is based on an isolated scatterer model assumption,thus the scatterers in the beam can be extracted individually.The radial range of each scatterer is estimated by the maximal likelihood estimation.Then,the horizontal and vertical wave path difference is derived by using the phase comparison technology for each scatterer,respectively.Finally,by utilizing the relationship among the 3 D coordinates,the radial range,the horizontal and vertical wave path difference,the 3 D image of the target can be reconstructed.The reconstructed image is free from the limitation in InISAR that the image plane depends on the target's own motions and on its relative position with respect to the radar.Furthermore,a phase ambiguity resolution method is adopted to ensure the success of the 3 D imaging when phase ambiguity occurs.It can be noted that the proposed phase ambiguity resolution method only uses one antenna pair and does not require a priori knowledge,whereas the existing phase ambiguity methods may require two or more antenna pairs or a priori knowledge for phase unwarping.To evaluate the performance of the proposed method,the theoretical analyses on estimation accuracy are presented and the simulations in various scenarios are also carried out. | LI Yuhan QI Wei DENG Zhenmiao FU Maozhong ZHANG Yunjian | 2021 | Journal of Systems Engineering and Electronics2021，32，1： | 3 |
| 2 | High-precision angle estimation based on phase ambiguity resolution for high resolution radars显示文摘Dear editor,In case of tracking radars, performing highprecision angle estimation is crucial to determine the spatial position of a target [1]. Majority of the modern radars use a monopulse technique, which is a classical high-precision method for estimating the angle of target [1–3]. | Xiangyu XIONG Zhenmiao DENG Wei QI Yujiang DOU | 2019 | Science China(Information Sciences)2019，62，4： | 1 |
| 3 | Further investigation on time-domain maximum likelihood estimation of chirp signal parameters 显示文摘 | Deng Zhenmiao Ye Linmei Fu Maozhong | 2013 | IET Signal Processing2013，7，5： | 1 |
| 4 | High precision phase-domain radial velocity estimation for wideband radar systems显示文摘Radial velocity estimation used in wide-band radar systems is investigated.By analyzing the signal of cross-correlation output of adjacent echoes,it is found that the frequency and phase of the cross-correlation output are related to the target’s radial velocity.Since the precision of the phase estimation is higher than that of the frequency,a phase-based velocity estimator is proposed.However,the ambiguity problem exists in the phase estimators,and thus the estimation of the cross-correlation of adjacent echoes(CCAE)is used to calculate the ambiguity number.The root-mean-square-error(RMSE)of the proposed estimator is derived.Simulation results show that the performance of the proposed method is better than that of the frequency-based estimator. | QI Wei CUI Zijian YAO Huisheng DENG Zhenmiao | 2020 | Journal of Systems Engineering and Electronics2020，31，3： | 0 |
| 5 | Range-spread target detector via coherent energy accumulation and block thresholding denoising显示文摘A range-spread target(RST)detector is proposed for wideband radar.The detector,referred to as a conjugate multiplication and block thresholding(CMBT)detector,is simple for implementation in existing radar systems and has the advantage of minor calculation.First,the target energy of adjacent stretched echoes is coherently accumulated via conjugate multiplication and Fourier transform operations.It is noted that conjugate multiplication of two complex Gaussian distributed noise is complex double Gaussian distributed,leading to a signal to noise ratio(SNR)loss.Subsequently,considering the sparsity and clustering characteristics of the conjugate multiplication amplitude spectrum(CMAS),the block thresholding method is adopted for denoising,where the noise and cross-terms are adaptively smoothed,and the signal terms can be basically preserved.Finally,numerical simulation results for both synthetic and real radar data validate the effectiveness of the proposed detector,comparing with the conventional integration detector(ID),the spatial scattering density(SSD)detector,and waveform entropy(WE)and waveform contrast(WC)based detectors. | ZHANG Yunjian PAN Pingping DENG Zhenmiao WU Gang | 2021 | Journal of Systems Engineering and Electronics2021，32，4： | 0 |
| 6 | Phase-domain blind estimation of symbol duration based on Haar wavelet transform显示文摘A phase-domain blind estimator of symbol duration based on Haar wavelet transform(HWT) is proposed.It can estimate the symbol duration of phase modulated signals,such as M-ary phase-shift keying(MPSK) signals and polyphase coded signals.The closed form of the spectrum of HWT is derived.Theoretical analysis shows the frequency of the first spectral peak is equal to the symbol rate,which is the reciprocal of symbol duration.Thus the symbol duration can be extracted from the spectrum.Subsequently,the optimum wavelet scale is determined according to the maximum output signal to noise ratio(OSNR) criterion.MAT-LAB simulations show that this algorithm can blindly estimate the symbol duration without any prior knowledge.This estimator need not estimate the carrier frequency and has the characteristics of low computation complexity and high accuracy. | Zhenmiao Deng Yu Liu | 2010 | Journal of Systems Engineering and Electronics2010，21，3： | 0 |
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