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计算机工程与应用 2004年第18期40卷 215-216,224页

作者：蓝金巧孙晓闻吴顺君西安电子科技大学雷达信号处理国家重点实验室西安710071

分析了不同的多相滤波器对基于多相滤波的数字正交检波器性能所造成的影响。提出了4种多相滤波器选择方案:从32阶原型滤波器依次抽取出4个分支滤波器,取1、3分支为方案一,2、4分支为方案二;对32阶原型滤波器进行1/2抽取得到方案三,方案... 详细信息

分析了不同的多相滤波器对基于多相滤波的数字正交检波器性能所造成的影响。提出了4种多相滤波器选择方案:从32阶原型滤波器依次抽取出4个分支滤波器,取1、3分支为方案一,2、4分支为方案二;对32阶原型滤波器进行1/2抽取得到方案三,方案四是16阶原型滤波器的1/2抽取。它们均能在带宽内实现大于60dB的镜频抑制比,且不需混频,但在边带的镜频抑制比和实现的难易程度不同。在实际应用中,可根据实际情况选择不同的方案,具有很强的实用价值。

关键词：多相滤波正交检波镜频抑制比

Generalized adaptive subspace detector for range-Doppler spread target with high resolution radar

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Science China(Information Sciences) 2011年第1期54卷 172-181页

作者： DAI FengZhou,LIU HongWei & wu shunjun national lab of radar signal processing,Xidian University,Xi’an 710068,China 1. national lab of radar signal processing Xidian University Xi’an 710068 China

A generalized adaptive subspace detector for range-Doppler spread target(RDST-GASD)in the non-Gaussian clutter is derived in this *** subspace model of multi-pulse wideband radar target returns is established in the frequency-slow time *** clutters are modeled as nonhomogeneous spherically invariant random vectors(SIRVs);that is,the power of the clutter is different from one range cell to *** clutter covariance matrix is estimated with the secondary *** constant false alarm rate(CFAR)property of RDST-GASD with respect to both the power and the covariance matrix of the clutter is demonstrated *** that there is target range walking across range cells during a coherent processing interval(CPI)for wideband radar,the RDST-GASD does range alignment to the multiple returns of the target in a *** a result,the coherent integration is implemented and the detection performance is improved.

关键词： high resolution radar range-Doppler spread target range walking SIRV adaptive subspace de- tector

ASIC DESIGN OF ADAPTIVE THRESHOLD DENOISE DWT CHIP

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Journal of Electronics(China) 2002年第1期19卷 1-7页

作者： Luo Feng wu shunjun Jiao Licheng ZhangLinrang(national key lab. for radar signal processing, Xidian University, Xi’an 710071) national key lab. for radar signal processing Xidian University Xi'an 710071

According to the relationship of wavelet transform and perfect reconstructive FIR filter banks, this paper presents a real-time chip with adaptive Dorioho’s non-linear soft-threshold for denoising in different levels of multi-scale space through rearranging the input data during convolving, filtering and sub-sampling. And more important, it gives a simple iterative algorithm to calculate the variance of the noise in interregna with no signal. It works well whether the signal or noise is stationary or not.

关键词： Wavelet transform Filter banks ASIC CPLD

FINITE WORDLENGTH ANALYZING FOR RLS SYSTOLIC ALGORITHM BASED ON THE SQUARE-ROOT-FREE SCALED GIVENS ROTATIONS

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Journal of Electronics(China) 1997年第4期14卷 367-373页

作者： Xiong Jun Liao Guisheng wu shunjun(key laboratory of radar signal processing, Xidian University, Xj’an 710071)

The least squares(LS) minimization problem constitutes the core of many real-time signal processing problems. A square-root-free scaled Givens rotations algorithm and its systolic architecture for the optimal RLS residual evaluation are presented in this paper. We analyze upper bounds of the dynamic range of processing cells and the internal parameters. Thus the wordlength can be obtained to prevent overflow and to ensure correct operations. Simulation results confirm the theoretical conclusions and the stability of the algorithm.

关键词： Linear least squares minimization problem Adaptive signal processing Systolic array

THE DESIGN OF VMEBUS BRIDGE CONTROLLER WITH SHARC BUS

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Journal of Electronics(China) 2005年第6期22卷 632-639页

作者： Wang Min wu shunjun Su Tao key lab for radar signal processing Xidian University Xi＇an 710071 China

Targeting at the high expense and inflexibility to realize VMEbus bridge controller by professional Integrated Circuit (IC), this paper presents a scheme of adopting CPLD/FPGA (Complicated Programmable Logic Device/Field Programmable Gate Array) to design bridge controller between VMEbus and local bus. SHARC DSP (Digital signal Processor) bus is an example. It has functions of nearly entire master/slave interface of VMEbus, and can act as DMA (Direct Memory Access) controller and perform block transfer in DMA or master processor initiative way without length limit. External circuit of the design is very simple. In comparison with special ICs, it has high performance to price ratio and can be easily applied to local buses of other processors with quite a little modification.

关键词： VMEbus Bridge controller Complicated Programmable Logic Device(CPLD) Master Slave SHARC bus

A NOVEL DETECTOR FOR UPLINK CDMA SYSTEM WITH UNKNOWN INTERFERENCE

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Journal of Electronics(China) 2003年第4期20卷 289-292页

作者： wu Lili Huang Hui Liao Guisheng (key lab for radar signal processing, Xidian University, Xi’an 710071) key lab for radar signal processing Xidian University Xi'an 710071

In this letter, the detection of asynchronous DS-CDMA signal with multipath fading and interference from neighboring cells is studied. A novel multiuser detector based on Gibbs sampler is proposed, in which Gibbs sampler is employed to perform the Bayesian multiuser detection according to the linear group-blind decorrelator output. Since Gibbs sampler is dependent of parameter estimation that can be improved by the output of the detector, an enhanced Gibbs sampler based detector using the improved parameter estimation is put forward. The novel multiuser detection technique has the advantages of high performance and wide applications. Computer simulations show its effectiveness.

关键词： Gibbs sampler Asynchronous DS-CDMA signal Bayesian multiuser detection Parameter estimation

STUDY OF MISMATCHED FILTERING OF PASSIVE radar USING TV signal

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Journal of Electronics(China) 2006年第1期23卷 144-147页

作者： Sun Xiaowen Zhang Linrang wu shunjun State key lab of radar signal processing Xidian University Xi＇an 710071 China

This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause the range ambiguity. To overcome this problem, the mismatched filter is proposed to suppress the correlation sidelobcs of matched filtering of TV signals. By utilizing the iteration process, this method could achieve the required peak sidclobc level. The impacts of the noise and target movement on mismatched filtering are also analysed, Simulation results are included to demonstrate the effectiveness of the proposed technique.

关键词： Color TV signal Mismatched filtering Sidelobe suppression Passive radar

Optimizing and Implementing the Fast Algorithm for Real Time SAR Imaging

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Optimizing and Implementing the Fast Algorithm for Real Time...

Technique of Doppler compensation for phase-coded signal pulse compression

2006 CIE International Conference on radar

作者： Tao Su 1 Xuehui He 1 shunjun wu 1 1 national key lab.for radar signal processing Xidian University Xi’an 710071 China

A fast correlation algorithm in SAR imaging is presented to lower down the computation burden of range compression and azimuth focusing *** is based on the decomposition method of *** order to minimize the computation amount,the relationship of number of padding zeroes and the decomposition scheme to computation complexity is investigated,which is dependent on the number of correlation filter coefficient *** for different numbers of correlation filter coefficient taps,the number of padding zeroes and decomposition scheme are *** algorithm is superior in computational efficiency compared with other *** is applied to real time SAR imaging and proved to be effective in computation.

关键词： decomposition optimizing

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Technique of Doppler compensation for phase-coded signal pul...