Nanjing Research Institute of Electronics Technology

Nanjing, China

Nanjing Research Institute of Electronics Technology

Nanjing, China
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Lu K.,Nanjing Research Institute of Electronics Technology
Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011 | Year: 2011

Combined the characteristics of skywave over-the-horizon radar with the concept of cognitive radar, cognitive over-the-horizon radar (COTHR) becomes an important development approach of over-the-horizon radars. Integrating multitasking requirements with real-time dynamically sensing to propagation media - the ionosphere, COTHR assigns intelligently the missions and resources, achieves the best detection. In this paper, the definition of COTHR has been proposed firstly. And the characteristics of COTHR, including environment sensing, continuously iteration, and spectrum management, have been discussed in detail. Finally, some key techniques have been addressed. © 2011 IEEE.


Xue H.,Nanjing Research Institute of Electronics Technology
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

A Cassegrain optical system of infrared search and trace (IRST) working at 8~12 μm is introduced. After analyzing the characters of the IRST system, the compositions of the optical system are described. A diffractive optical element (DOE) is successfully introduced to the second imaging to correct ray aberrations, which makes the system working well at room temperature. In order to make the system work in a wide thermal environment, an electromechanical device is utilized to control the compensation lenses. To suppress the great amount of stray light, lens hood is set on the primary and secondary mirrors, which could eliminate stray light efficiently. Hence signal-to-noise ratio and contrast of the picture have been enhanced. The experiment shows that the system works well.


Zhang S.-Y.,Nanjing Research Institute of Electronics Technology
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | Year: 2014

Estimating procession period based on ballistic missile target's Radar Cross Section (RCS) sequences is an important means of feature extraction and target identification. The RCS sequences of ballistic missile target are unstable random process when the target is in procession, and the conventional Fourier transform and correlation type method needs long observation time and high data rate to estimate the procession period, which are unacceptable to the limited radar resource. A novel method of estimating procession period based on RCS sequences is presented. The proposed method first fits the RCS sequences with trigonometric function of a certain frequency, then get a procession frequency that minimize the fitting errors of different frequencies' trigonometric function. The proposed method estimate more accurately and needs fewer time resources than conventional ones, as is validated by the simulation results of RCS data.


Lv Y.,Nanjing Research Institute of Electronics Technology
AUTOTESTCON (Proceedings) | Year: 2015

To guarantee the data quality is of the first importance in the research of monitoring and management of the health of large complex electronic systems such as radars, and tracking the working performance. Influenced by the combined effect of all kinds of interfering factors, the observation series reflecting the health of a radar usually includes variety of outliers and noise, which ought to be detected and eliminated in time. After modeling the radar's health observation series, analyzing the correlation of neighbored observations based on Autoregressive and Moving Average Model (ARMA), a real-time outlier detection and replacement algorithm was put forward, which could rectify the employed ARMA model self-adaptively when radar's heath evolvement stage changed. The promoted algorithm was suitable to detect and replace the outliers dynamically, overcoming the shortcomings of the classical threshold comparison detection methods which could not deal with the outliers belongs to the heath evolution process characterized by trend and self-correlation. Finally, the experiment result indicated that the algorithm could detect the outliers validly and satisfy the application's demand for real time. © 2015 IEEE.


Zhou W.-X.,Nanjing Research Institute of Electronics Technology
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2016

Introducing velocity measurement into track filtering can improve filtering accuracy,but velocity ambiguity in LPRF radar still exists,and range differential or Kalman filter cannot solve this problem completely.Thus,a new velocity ambiguity filtering method based on multi-parameter delay decision is proposed.According to Bayes track probability,multi-hypothesis delay decision can be performed on those velocity parameters that are difficult to be decided currently,so the problem of radical velocity ambiguity in LPRF radar will be solved effectively.Simulation results show that this method is helpful for velocity ambiguity resolution and radical velocity measurement filtering,thus range estimation accuracy can be improved significantly and angle estimation accuracy can be improved to a certain extent. © 2016, Chinese Institute of Electronics. All right reserved.


Zhou W.-X.,Nanjing Research Institute of Electronics Technology
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2011

Based on the basic mechanism and characteristics, the development history and current status of skywave over-the-horizon radar has been addressed. Due to the military requirement and hotspot in the new era, the situation and functions of skywave radar in strategic warning system has been illuminated, including air defense, anti-missile and surface surveillance. In research fields such as system design, signal processing and data processing, the research trends and key techniques have been reviewed. Current research interests and hotspots in skywave radar have been proposed and some technical approaches have been discussed. Finally the development of skywave over-the-horizon radar has been prospects.


Xiao W.-S.,Nanjing Research Institute of Electronics Technology
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2010

Recently, it becomes difficult for normal radar system to detect the stealth targets and space objects, so the researchers have paid more attention to the MIMO radar. For moving targets, the probability density function of sufficient statistic is analyzed firstly; then, the meaning of four working mode is discussed; finally, based on four working mode, the MIMO radar system's detection method and performance are development. By theoretical analysis and simulation, we get the conclusions witch are: MISO working mode is suitable for MIMO radar system, and the number of receive station should be 4~6.


Wu S.-S.,Nanjing Research Institute of Electronics Technology
Proceedings - 4th International Conference on Computational and Information Sciences, ICCIS 2012 | Year: 2012

The article describes the design and implementation of generic situation layer building way oriented to the separate database. By designing general separate database metadata describing model and battlefield situation layers describing model, and constructing the describe of dynamic mapping and transforming relation between database metadata describing model and battlefield situation Layers describing model, we are able to standardize the way of extracting the database metadata, flexible configuring situation layers and automatic generating the describing of situation layer, in order to implement the dynamic integration of multi-source static and basic database data, and assist the generation of the situation layers. © 2012 IEEE.


Cheng C.H.,Nanjing Research Institute of Electronics Technology
IET Conference Publications | Year: 2015

The demand for collaboration between specialties is proposed in order to improve the efficiency of electronic products development. As for the structural design of radar system, a concept of TOP-DOWN collaborative design based on PDS platform is employed to realize coordinative development among various specialties and different departments. This paper mainly presents key points about procedures and specifications during 3D collaborative design by means of CREO 2.0 software on PDS platform. The discussion involves aspects of coordination system, framework model and process of collaborative product design. © 2015, Institution of Engineering and Technology. All rights reserved.


Chen C.,Nanjing Research Institute of Electronics Technology
IET Conference Publications | Year: 2015

This paper presents a model for a hexapod robot to solve the optimal force distribution problem with equality and inequality constraints. To find a fast way to obtain a suitable force distribution for the hexapod robots, an analytical force distribution method using the principle of linear interpolation of optimal solution for the control is introduced. The smoothness and continuousness of the solution and its ability to prevent leg slippage is evaluated by simulation. © 2015, Institution of Engineering and Technology. All rights reserved.

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