Science Research Institute of China North Industries Group Corporation

Beijing, China

Science Research Institute of China North Industries Group Corporation

Beijing, China

Time filter

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Yu J.-Y.,China Academy of Space Technology | Bo P.,China Academy of Space Technology | Bo P.,Beihang University | Dan H.,Science Research Institute of China North Industries Group Corporation | And 2 more authors.
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

According to the requirement of the navigation satellite in orbit power, limited hardware resources and the high real-time of spread spectrum communication, an efficient FFT based fast correlation detection design of high efficiency onboard is proposed. First, the navigation satellite spread spectrum signal acquisition is described, the existing methods are analyzed which require a lot of hardware resources, further miniaturization is not conducive or practical to the development of communication module on-board; then, the algorithm of the acquisition process of spread spectrum signal is improved, and FFT based method is used to combine the digital down conversion process with the pseudo code to simplify the hardware implementation, in which a matched filter is used to complete the correlation detection of IF signal; and, the corresponding hardware design structure is given according to the improved theory method; At last, based on the design method of this paper, the experiment is carried out in FPGA, which is compared with the previous design. Compared to the previous design, the proposed has less resource occupation, faster maximum speed, the experimental results show the effectiveness of the design itself. © 2016 IEEE.


Yu J.-Y.,China Academy of Space Technology | Dan H.,Science Research Institute of China North Industries Group Corporation | Wang L.-Y.,China Academy of Space Technology | Xin L.,China Academy of Space Technology | Li W.-J.,China Academy of Space Technology
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

A on-board ship targets detection method based on multi-scale salience enhancement is proposed. Unlike the traditional wavelet filter enhancement methods, the proposed utilizes the wavelet decomposition to obtain the high-low frequency parts, and estimate the salience feature with both parts, which enhance the ship targets efficiently. First, decompose the remote sensing image by 2-D DWT, and obtain the low-frequency part, high-frequency part of horizontal, vertical and diagonal; then, compute the OSTU threshold, which is subtracted by the low-frequency coefficients to get the low-frequency salience image; and, the high-frequency parts are used to compose the high-frequency salience image; finally, the high-low parts are fused by addition and normalized to obtain the salience map. The original data of multi sets of remote sensing images are experimented, and the results are compared with the method without the proposed salience enhancement. The proposed shows obvious salience enhancement for the low-resolution, high-noise remote sensing images. © 2016 IEEE.


Yu J.-Y.,China Academy of Space Technology | Dan H.,Science Research Institute of China North Industries Group Corporation | Xin L.,China Academy of Space Technology | Ke X.,China Academy of Space Technology | Wang L.-Y.,China Academy of Space Technology
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

A conflict-free architecture for multi-butterfly parallel processing in-place radix-r fast Fourier transform (FFT) is proposed. The parallel FFT computing principle for any radix-r is deduced, and the number of data points and butterfly units could be the any integer power of r. The method works for FFT data paths with pipeline data stream and multiple dual-port memory banks for parallel access. By dividing the data needed to be processed into multiple independent sets, a method is given to calculate the discrete Fourier transform (DFT) with multiple parallel small points DFT. With the help of time division multiplexing radix-r butterfly, the multi-butterfly could access the memory banks without conflicts and additional hardware cost compared with the traditional algorithm. The hardware implementation block diagram of the new method are also presented, and the comparison of computing time with the traditional methods shows the effectiveness of the new architecture. © 2016 IEEE.


Yu J.-Y.,China Academy of Space Technology | Dan H.,Science Research Institute of China North Industries Group Corporation | Wang L.-Y.,China Academy of Space Technology | Jian G.,China Academy of Space Technology | Wang Y.-H.,Beijing Institute of Technology
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

Optical remote sensing satellite holds great potential for ship detection. However, it is challenging for real-time detection due to the relatively low resolution and complicated background. We propose a real-time on-board ship detection method based on statistical analysis and shape identification. First, Gaussian and median filter are used to reduce the periodical and pepper noise generated by the camera sensor system. Then, mathematical morphology processing is employed to remove the background interference and thus enhances the ship targets. Next, statistic analysis is performed on inspected and neighbor areas to distinguish the suspected ship target and pure-sea, land, islands or strong waves. Finally, features, such as the length-width ratio, circular degree of the suspected targets, are used to detect the targets. The proposed method was implemented on a single FPGA and was validated on real high-orbit optical satellite images. For an image as large as 1024×1024 of 8bits, the computation time was less than 10 seconds. The detection rate was above 90% while the false alarm rate was under 5%. The experimental results demonstrate the ability to support low-power consumption, miniaturization for the real-time ship targets detection on-board. © 2016 IEEE.


Shao Z.Y.,Beijing Institute of Technology | Feng Y.,Science Research Institute of China North Industries Group Corporation | Jin J.,Academy of Armored force Engineering | Bian J.N.,Beijing Institute of Technology
Advanced Materials Research | Year: 2014

The Unmanned Underwater Vehicle (UUV) is used more and more widely in military and non-military areas. Since UUV's navigation and motion control system is highly complex, a Hardware-In-the-Loop Simulation (HILS) system is designed and implemented to help research and development of its navigation and motion control system. The HILS system is mainly composed of real-time simulation computer, main control compute, GPS/Beidou satellite signal simulator, three-axis turntable, actuator load simulator, water pressure simulator, acceleration simulation unit, visual computer and interface devices. Performance specifications are allocated to each components of the HILS system according to dynamic characteristics of the UUV under complicated disturbances. Proximity between the results of the UUV's HILS and sea trial demonstrates the validity of the HILS system elementarily. © (2014) Trans Tech Publications, Switzerland.


Yu J.-Y.,China Academy of Space Technology | Huang D.,Science Research Institute of China North Industries Group Corporation | Liang C.-C.,China Academy of Space Technology | Wang B.,China Academy of Space Technology | And 2 more authors.
2016 IEEE International Conference on Mechatronics and Automation, IEEE ICMA 2016 | Year: 2016

An effective method is proposed for calculating the on-board real-time path planning of large-scale space redundant manipulators. Firstly, the 7-DOF manipulator kinematics model is described and analyzed, and the main computational process of path planning is presented. The homogeneous transformation matrices of various degrees of freedom are obtained through the telemetry joint angle, and is used to calculate the Jacobian matrix and the pseudo inverse for the angular velocity of each joint. Then, according to the theoretical analysis, the on-board hardware design structure based on FPGA computing is deduced, and the parallel matrix multiplication and inversion implementation structures are depicted, and the path planning computing data flow are given based on FPGA implementation. Finally, the path planning hardware implementation based on the FPGA is tested and the results are compared with the previous design. Compared to the previous design computing resources, speed and error, the proposed method with fewer resources occupied, fast calculation speed, and error can meet the on-board calculation and the experimental results show the effectiveness of the design. © 2016 IEEE.


Hu C.,Beijing Institute of Technology | Liu Z.-P.,Beijing Institute of Technology | Zeng T.,Beijing Institute of Technology | Fu B.-B.,Science Research Institute of China North Industries Group Corporation | Zhu Y.,China Academy of Space Technology
Binggong Xuebao/Acta Armamentarii | Year: 2010

The geosynchronous earth orbit synthetic aperture radar (GEO SAR) running in high orbit can capture high resolution radar image in hundreds or thousands of kilometers and offer a very effective way for target reconnaissance and accurate attack in wide swath. The large orbit height brings a lot of advantages, and causes a lot of imaging difficulties for GEO SAR. The conventional lower orbit SAR secondary range compression algorithms are based on the linear trajectory model or the Fresnel approximation. It will cause high order phase error of hundreds radians and result in severe spatial-variance in range direction when it is used in GEO SAR, thus the accurate focusing is difficult to be implemented under the conditions of long synthetic aperture time and large scene. An improved secondary range compression (SRC) algorithm to adapt the GEO SAR imaging requirements at perigee was proposed. Based on the accurate satellite curve trajectory model, the chirp rate of azimuth reference function was analytically derived, and its variance was adaptively compensated and the spatial-variance in range direction was overcome. Under the conditions of 100 seconds in synthetic aperture time and 40 km in distance, the simulation results verify the effectiveness of the algorithm proposed in this paper, and the highly accurate imaging can be implemented in GEO SAR.


Yu J.,China Academy of Space Technology | Huang D.,Science Research Institute of China North Industries Group Corporation | Zhao S.,China Academy of Space Technology | Pei N.,China Academy of Space Technology | And 2 more authors.
WIT Transactions on Engineering Sciences | Year: 2014

A real-time Stirling formula algorithm based on hardware acceleration is proposed. The large number is represented by the extended floating-point in the hardware design, and the hardware logic implementation for the Stirling formula is derived. By calculating the base 2 logarithm of the integer part and the fractional part, the result of the Stirling formula is divided into exponent and mantissa. The logarithm is derived by CORDIC, and the Taylor series is used to calculate the fractional power of 2. The proposed algorithm is implemented in FPGA, while the hardware block diagram and resources costs are deduced. The factorial results calculated by Matlab and FPGA based on the Stirling formula are compared and analyzed, while the proposed provides high accuracy and computing efficiency. © 2013 WIT Press.


Feng Y.,Beijing Institute of Technology | Feng Y.,Science Research Institute of China North Industries Group Corporation | Tao R.,Beijing Institute of Technology | Wang Y.,Beijing Institute of Technology
Science China Information Sciences | Year: 2012

The signal feature of propeller cavitation noise during acceleration or deceleration procedure can be used to passively detect and classify moving vessels and underwater vehicles in the port regions. By analyzing the chirp periodicity of the variation of propeller wake velocity under acceleration situation, this paper presents a time domain expression of the modulation envelope signal of the accelerating propeller noise, treating the signal as a Gaussian-shaped chirp periodic pulse train with increasing trend and fluctuating pulse amplitude. The paper investigates the characteristics of simplified fractional Fourier transform (SFRFT) spectrum of the chirp periodic signal, and thus obtains the relation between the chirp periodic signal and its chirp harmonics under the conditions of underwater passive detection. Furthermore, the experimental data of the cavitation tunnel satisfy the results obtained by simulation, which verifies the correctness of the proposed signal model. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.


Yao W.-J.,Science Research Institute of China North Industries Group Corporation | Chen L.,Science Research Institute of China North Industries Group Corporation
Binggong Xuebao/Acta Armamentarii | Year: 2010

The equipment system construction of airborne force is vital significant for improving its combat abilities. Based on the analysis and discussion of status and development trend of foreign airborne force, the differences and problems of native airborne force equipments are point out. Some suggestions on their system construction are proposed.

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