Preceded False Target Groups Jamming Against LFM Pulse Compression Radars

2011 ◽  
Vol 30 (6) ◽  
pp. 1350-1353 ◽  
Author(s):  
Jian-cheng Liu ◽  
Xue-song Wang ◽  
Zhong Liu ◽  
Jian-hua Yang ◽  
Guo-yu Wang
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Zijian Wang ◽  
Wenbo Yu ◽  
Zhongjun Yu ◽  
Yunhua Luo ◽  
Jiamu Li

Interrupted-sampling repeater jamming (ISRJ) is a new type of DRFM-based jamming designed for linear frequency modulation (LFM) signals. By intercepting the radar signal slice and retransmitting it many times, ISRJ can obtain radar coherent processing gain so that multiple false target groups can be formed after pulse compression (PC). According to the distribution characteristic of the echo signal and the coherence of ISRJ to radar signal, a new method for ISRJ suppression is proposed in this study. In this method, the position of the real target is determined using a gated recurrent unit neural network (GRU-Net), and the real target can be, therefore, reconstructed by adaptive filtering in the sparse representation of the echo signal based on the target locating result. The reconstruction result contains only the real target, and the false target groups formed by ISRJ are suppressed completely. The target locating accuracy of the proposed GRU-Net can reach 92.75%. Simulations have proved the effectiveness of the proposed method.


Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7702
Author(s):  
Zhidong Liu ◽  
Qun Zhang ◽  
Kaiming Li

Interrupted sampling repeater jamming (ISRJ) is an effective method for implementing deception jamming on chirp radars. By means of frequency-shifting jamming processing of the target echo signal and pulse compression during image processing, a group of false targets will appear in different spatial locations around the true target. Extracting the features of these false targets is complex and limited to existing countering methods against ISRJ. This paper proposes an anti-jamming method to identify the spatial location characteristics of two-dimensional deception false targets. By adjusting the parameters of the radar transmitted signal, the method simultaneously transmits the anti-jamming signal and carries out false target identification and elimination in the range and azimuth dimensions. Eventually, the optimal signal parameter design of the anti-jamming signal is obtained by comparing different anti-jamming strategies in the range dimension. The validity of the proposed method is proved by deducing the mathematical model between the spatial distribution characteristics of the false targets and the radar transmitted signal parameters and demonstrated by simulations.


Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8277
Author(s):  
Chaoyu Wang ◽  
Wanwan Hu ◽  
Zhe Geng ◽  
Jindong Zhang ◽  
Daiyin Zhu

By repeatedly sampling, storing, and retransmitting parts of the radar signal, interrupted sampling repeater jamming (ISRJ) based on digital radio frequency memory (DRFM) can produce a train of secondary false targets symmetrical to the main false target, threatening to mislead or deceive the victim radar system. This paper proposes a computationally-effective method to estimating the parameters for ISRJ by resorting to the framework of alternating direction method of multipliers (ADMM). Firstly, the analytical form of pulse compression is derived. Then, for the purpose of estimating the parameters of ISRJ, the original problem is transformed into a nonlinear integer optimization model with respect to a window vector. On this basis, the ADMM is introduced to decompose the nonlinear integer optimization model into a series of sub-problems to estimate the width and number of ISRJ’s sample slices. Finally, the numerical simulation results show that, compared with the traditional time-frequency (TF) method, the proposed method exhibits much better performance in accuracy and stability.


2008 ◽  
Vol 16 (3) ◽  
pp. 123-126 ◽  
Author(s):  
Toni Faltermaier

Abstract. The Flensburg health psychology group takes a salutogenic perspective and aims at developing innovative health promotion approaches. It stands in the interdisciplinary context of health and educational sciences. Our focus in research is on both, stress processes and lay representations of health and illness in the context of salutogenic theories of health. Basic and applied research activities aim at developing subject-oriented approaches of prevention and health promotion that are designed to promote health resources and competencies in selected settings and target groups. Current research is concentrated on socially disadvantaged groups, on occupational groups and on men to develop tailored health promotion approaches that reach groups in need and which show sustainable effects.


2015 ◽  
Vol 14 (3) ◽  
pp. 153-162 ◽  
Author(s):  
Andrea Fischbach ◽  
Philipp W. Lichtenthaler ◽  
Nina Horstmann

Abstract. People believe women are more emotional than men but it remains unclear to what extent such emotion stereotypes affect leadership perceptions. Extending the think manager-think male paradigm ( Schein, 1973 ), we examined the similarity of emotion expression descriptions of women, men, and managers. In a field-based online experiment, 1,098 participants (male and female managers and employees) rated one of seven target groups on 17 emotions: men or women (in general, managers, or successful managers), or successful managers. Men in general are described as more similar to successful managers in emotion expression than are women in general. Only with the label manager or successful manager do women-successful manager similarities on emotion expression increase. These emotion stereotypes might hinder women’s leadership success.


2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-617-Pr2-620
Author(s):  
Z. Zeng ◽  
R. Li ◽  
Z. Z. Xu

Author(s):  
Nguyen Van Dung ◽  
Giang Khac Binh

As developing programs is the core in fostering knowledge on ethnic work for cadres and civil servants under Decision No. 402/QD-TTg dated 14/3/2016 of the Prime Minister, it is urgent to build training program on ethnic minority affairs for 04 target groups in the political system from central to local by 2020 with a vision to 2030. The article highlighted basic issues of practical basis to design training program of ethnic minority affairs in the past years; suggested solutions to build the training programs in integration and globalization period.


2019 ◽  
Vol 8 (4) ◽  
Author(s):  
Nguyen Van Dung ◽  
Nguyen Ngoc Minh ◽  
Pham Kim Cuong

Developing a ethnic knowledge training program for cadres, civil servants and public employees according to 04 target groups (Prime Minister, 2018) in the political system from the central to local levels to meet the requirements of ethnic minority affairs up to 2030 is an urgent task. Because the program is “the core” to create a breakthrough in training ethnic knowledge, improving the capacity of the contingent of cadres, civil servants and public employees in formulating ethnic policies and organizing the implementation of Party and State’s policies in the current period. The article analyzes the results of theoretical and practical research on the development of ethnic knowledge training program and provides the results of developing a program that meets the requirements of Vietnam’s ethnic minority affairs from now to 2030.


Author(s):  
Maulana Akbar Shah @ U Tun Aung

Abstract In addition to compliance with the five pillars of Islam, Da’wah Islamiyyah is an indispensable act for Muslims who view their life missions as to propagate Islam. The act of da’wah is a mission only undertaken by those who are selected to do so, as Allah SWT said: “You are the best of peoples, taken out for mankind, you enjoin what is right, forbid what is wrong…,” (Al-Qur’an, Al- `Imran, 3:110). The phrase “you are taken out for mankind” is a very clear phrase which refers to a special group. Many du’at propagate Islam through regular procedures. In this contemporary day and age, it would be more successful if creative da’wah methodologies are used to special groups where special talent is required. Examples of these special target groups are individuals such as [1] pregnant mothers, [2] mothers of new born babies, [3] parents of toddlers, [4] parents of children [5] youth, teenagers and adolescents, [6] married couples, [7] elderly or aged individuals and [8] non-Muslims.  They are good targets to promote Islam. Thus, du’at must have special talents and knowledge to do so. In this regard, du’at must be equipped with exceptional knowledge of the target groups to propagate Islam effectively. The present paper attempts to highlight the distinctive natures of the above mentioned categories of individuals and explores how du’at should approach them when he or she encounters them for the purpose of promoting Islam.        Keywords: Call to Islam, Da’wah Islamiyyah, creative da’wah, creative da’ie, enjoin good, forbid evil.   Abstrak Selain mematuhi 5 rukun Islam, dakwah Islamiyyah tidak dapat diasingkan daripada seseorang Muslim yang bermatlamat untuk menyebarkan ajaran Islam. Berdakwah adalah suatu tugas yang hanya dijalankan oleh mereka yang terpilih. Seperti yang diwahyukan oleh Allah SWT “Kamu adalah sebaik-baik umat yang dilahirkan bagi umat manusia, kerana kamu menyuruh berbuat segala perkara yang baik dan melarang daripada segala perkara yang buruk dan keji...” (Al-Quran, Al-Imran, 3:110). Frasa “umat yang dilahirkan bagi umat manusia”  jelas dinyatakan di mana ia merujuk kepada satu golongan yang istimewa. Kebanyakan pendakwah menyebarkan Islam melalui metodologi yang sudah menjadi kebiasaan. Bagaimanapun, pada zaman ini, pendakwahan akan lebih berjaya jika kaedah yang kreatif digunakan kepada beberapa golongan yang tertentu. Antara contoh golongan yang dimaksudkan adalah [1] wanita yang mengandung, [2] ibu kepada bayi yang baru lahir, [3] ibu bapa kepada anak-anak kecil, [4] ibu bapa kepada kanak-kanak, [5] golongan belia dan remaja, [6] pasangan suami isteri, [7] warga emas, dan [8] golongan bukan Islam. Mereka merupakan sasaran yang sempurna untuk mempelajari Islam. Oleh hal demikian, para pendakwah mesti mempunyai bakat yang istimewa dan ilmu yang mencukupi untuk berdakwah. Para pendakwah juga harus memahami kumpulan sasaran dengan menyeluruh supaya penyebaran ajaran Islam akan lebih berkesan. Tujuan penulisan ini adalah untuk menggariskan sifat unik golongan yang dinyatakan di atas dan menerokai bagaimana para pendakwah harus mendekati mereka dengan niat untuk menyebarkan Islam.   Kata Kunci: Panggilan kepada Islam, dakwah Islamiyyah, dakwah kreatif, da’ie kreatif, menyuruh kepada kebaikan, menghalang daripada kejahatan.  


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