Most downloaded articles

1 Testing Technology for Wafer Level Heterogeneous Integration Millimeter-wave Transceiver Module

ZHANG Zhaohua , ZHANG Minghui , CUI Kai , HU Yongfang

2023, 45(8):91-96.

[Abstract](4547) [HTML](0) [PDF 18.32 M](49123)

Abstract:
Wafer level packaging (WLP) technology can significantly compress the volume and weight of the front-end transceiver module, realizing the miniaturization of active phased array radar. However, it also brings great challenges, such as heat management, channel isolation, signal cross-talk and adaptability of repairing and testing. Due to the introduction of more process steps and complex package architecture, how to test wafer level packaging modules to ensure yield and reduce testing costs has become an important technical issue. In this paper, the wafer level heterogeneous integration technology in millimeter-wave is summarized. Besides, the testing requirements and technical challenges, along with some integration solutions and testing process of typical products are deeply discussed. The existing key technologies are sorted out from three aspects: wafer level testing with probe station, socket testing and over the air (OTA) testing. It can provide some valuable references for the construction of radio frequency wafer level 3D packaging modules.

2 Overview of Doppler Technology Based on Vortex Electromagetic Wave

BU Lijun , XIE Wenxuan , ZHOU Yuang , ZHU Yongzhong

2022, 44(10):14-20.

[Abstract](4861) [HTML](0) [PDF 12.48 M](14566)

Abstract:
According to the basic theory of electromagnetic vortex wave, the properties of electromagnetic vortex waves are simulated and analyzed. Based on the uniform circular array model, the aliasing characteristics of the square Bessel function at the pitch Angle are verified. The principles and properties of linear Doppler, rotary Doppler and micro-Doppler are compared to show the advantages and disadvantages of vortex detection. The research progress of electromagnetic vortex wave Doppler detection in recent years is summarized, and the detection ability is verified by simulation. At the same time, the key problems in rotary Doppler and micro-Doppler detection are summarized, and the direction of further research is pointed out.

3 Detection of Small Sea-surface Target Based on Random Forest in High-dimensional Feature Domain

SHI Sainan , YANG jing , DONG Zeyuan

2022(3):63-69.

[Abstract](4797) [HTML](0) [PDF 12.78 M](7381)

Abstract:
Feature detection is an effective way to improve the detection of small sea-surface targets. Aiming at the problems of low detection probability of low-dimensional features and difficult control of high-dimensional feature false alarms, a high-dimensional feature detection method based on random forest with controllable false alarms is proposed in this paper. First, multi-dimensional features are extracted from multiple domains of time domain, frequency domain, and time-frequency domain. The detection problem is converted into a two-class classification problem in high-dimensional feature space. Second, two types of balanced training samples including sea clutter and target echo are obtained by simulating returns with target. Third, random forest algorithm is introduced into high-dimensional feature space, and function expression of the splitting factor and the false alarm rate is established to obtain the control region of false alarm. Finally, it is verified by the IPIX measured data that the proposed detector has a certain performance improvement and meets the requirements of real radar with constant false alarm detection.

4 Collaborative R & D Platform for Radar Based on Three-unified System

PING Li-hao

2011, 33(3).

[Abstract](7652) [HTML](0) [PDF 0.00 Byte](1117)

Abstract:
Collaborative R&D platform on which processes,tools,data and knowledge were integrated was built through analyzing radar R&D problems.Unified design environment,unified process system,unified data space that composed radar R&D system were described.Three-tier structure of radar R&D platform was present.Management platform on collaborative tier provides the ability of task transition across organization and discipline.Design platform on application tier integrates knowledge and tool.Data platform on data tie...

5 E-P-AMCBFM for Analysis of Electromagnetic Scattering by Hybrid Dielectric and PEC Objects

ZHONG Shao-wei

2011, 33(3).

[Abstract](6533) [HTML](0) [PDF 0.00 Byte](902)

Abstract:
In computational electromagnetic field,the moment method based on surface integral equations for analysis of electromagnetic scattering by 3-D homogenous dielectric and PEC objects is a hot topic all through.In this paper,the EFIE integral equation is built on the surface and PMCHW integral equations is constructed based on the surface of homogenous dielectric object.Combined with adaptively modified characteristic basis function method(AMCBFM) that is based on dividing the object geometry into distinct blo...

6 Sorties Determination for Targets with Non-rigid-structure via Narrowband Coherent Radar

PENG Shi-bao , XU Jia , XIANG Jia-bin , PENG Ying-ning

2011, 33(3).

[Abstract](6845) [HTML](0) [PDF 0.00 Byte](878)

Abstract:
The sorties determination principle is discussed for narrowband coherent radar targets with non-rigid-structure based on a long coherent integration time in this paper.Firstly a novel signal model is proposed and some new concepts are put forward,such as common rotation Doppler,radial Doppler,chirp Doppler.And then it is pointed out that the initial frequency of target time-frequency distribution is decided by the sum of common rotation Doppler and radial Doppler,the trend is decided by chirp Doppler.Accord...

7 Data Fusion System Modeling of Air-ground Cooperation Networking Aerial Defence

ZHANG Ping-ding , ZHENG Kou-quan , WANG Rui

2011, 33(3).

[Abstract](7297) [HTML](0) [PDF 0.00 Byte](805)

Abstract:
Aiming at the complicated electromagnetic environment in informationization,Based on frame,function and character of the air-based command and control system and aerial denfence weapon network battle system,the concentrated,the distributed and the composite netting frame of the air-ground multi-sensor system fitting the dissimilar flat are proposed.Data fusion system model of the air-ground cooperation network aerial defense campaign system is constructed in this paper,which can improve the capability for a...

8 A Method of Characteristic Analysis and Identification on Convolution Jamming

GU Hai-yan , LU Gang , TANG Bin

2011, 33(3).

[Abstract](6697) [HTML](0) [PDF 0.00 Byte](797)

Abstract:
Convolution jamming has become an important jamming for its high utilizable efficiency of energy,admirable interference effect and flexible control.Based on the forming mechanisms,the interference performances and characteristics of different kinds of noise convolution jammings is analyzed.According to the difference of waveforms and phases between noise convolution jamming and ordinary pulse convolution jamming,the character factors are extracted,and then fuzzy pattern recognition has been used to recogniz...

9 Application of Higher-order Statistic to Servo Drive System Fault Diagnosis

卢雪林 , 程望东

2008, 30(7).

[Abstract](5550) [HTML](0) [PDF 0.00 Byte](793)

Abstract:
对小波包分解和高阶统计量理论进行了阐述,提出一种基于高阶统计量特征和小波包分析相结合的雷达伺服传动系统故障诊断方法.当传动系统故障发生时,振动信号一般是非平稳和非高斯分布的信号,通常包含较强的噪声.用小波包分析对故障信号进行有针对性分解,并提取出故障特征频率带,然后运用高阶谱对故障特征信号进行分析,能够有效地实现故障诊断.

10 Radar System State Comprehensive Evaluation Based on AHP and Fuzzy

HUANG Jian-jun , YANG Jiang-ping , FANG Zi-cheng

2011, 33(3).

[Abstract](6622) [HTML](0) [PDF 0.00 Byte](787)

Abstract:
Radar system state evaluation involves many factors,and most of the factors have fuzzy uncertainty.On the basis of establishing evaluation index system,an evaluation method of radar system state based on analytic hierarchy process(AHP) and fuzzy is proposed in this paper.For the problem that multi-factor comparison matrix is difficult to meet consistency is achieved by transfer matrix theory,then the comprehensive weight of each index is obtained.Aiming at difference of various indexes,methods of measuring ...

11 A Study on Relationship Between Target Detection Performance and Operation Frequency of HF Surface Wave Radar

YANG Yun-sheng , XUE Wen-hu , BIAN Xiao-lin

2011, 33(3).

[Abstract](7083) [HTML](0) [PDF 0.00 Byte](766)

Abstract:
Because the operation frequency of high frequency surface wave radar(HFSWR) for target detection is selected by the monitoring of outside noise level,the optimal detection performance can not be achieved.To solve the problem,the multiple factors that affect the target detection performance are analyzed based on HF surface wave radar equation,and then a frequency selection method is presented by numerical simulation to calculate the relationship curve between SNR(SCR) and frequency.With the operation frequen...

12 A New Algorithm of One-step Delay Based on Universal Tracking Initialization Model

TAO Zhao-yang , WANG Sheng-li

2011, 33(3).

[Abstract](6677) [HTML](0) [PDF 0.00 Byte](764)

Abstract:
A new algorithm is proposed to solve the problem of quick target tracking initialization in clutter.The advantages of a new track initial model and one-step delay approach are integrated.An intermediate stage is added to the current common track initiation model.The one-step delay approach is used in processing the intermediate track.Two scan measurements is used for calculating the cumulative innovation and eliminating the false tracks.By this algorithm,the design flexibility is improved and that probabili...

13 Characteristics and Application Analysis of Semiconductor Power Devices for Three Generations

郑新

2008, 30(7).

[Abstract](5875) [HTML](0) [PDF 0.00 Byte](763)

Abstract:
以Si双极型功率晶体管为代表的第一代半导体功率器件和以GaAs场效应晶体管为代表的第二代半导体功率器件为雷达发射机的大规模固态化和可靠性提高做出了贡献.近年来以SiC场效应功率晶体管和GaN高电子迁移率功率晶体管为代表的第三代半导体--宽禁带半导体功率器件具有击穿电压高、功率密度高、输出功率高、工作效率高、工作频率高、瞬时带宽宽、适合在高温环境下工作和抗辐射能力强等优点.人们寄希望于宽禁带半导体功率器件来解决第一代、第二代功率器件的输出功率低、效率低和工作频率有局限性以至于无法满足现代雷达、电子对抗和通信

14 A Method for PD Radar Dim Target Detection Based on Stochastic Resonance Principle

LIU Wei , LU Zai-qi , ZHU Yi-long

2011, 33(3).

[Abstract](6799) [HTML](0) [PDF 0.00 Byte](758)

Abstract:
Dim signal detection is chanllenging due to the fact that the signal is submerged by the powerful sidelobe clutter,while the pulse Dopple(PD) radar is following the target.Stochastic resonance principle is made good use of to improve the signal noise ratio and the detection performance.Firstly,the basic principle of stochastic resonance is introduced,and the frequency spectrum characteristic of the return signals is analyzed while the radar is after the target.Then a novel approach based upon stochastic res...

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