Netted Radar System Design with Spread Spectrum Technology

2011 ◽  
Vol 55-57 ◽  
pp. 648-653
Author(s):  
Lian Qing Fu ◽  
Li Sheng Yang ◽  
Tao Wang ◽  
Qing Le Zhang
Keyword(s):  
System Design ◽  
Spread Spectrum ◽  
Cross Correlation ◽  
Mutual Interference ◽  
Radar System ◽  
Power Ratio ◽  
Emission Signal ◽  
Simulation Results ◽  
Correlation Properties

In this paper, a novel netted radar system is designed to reduce the influence of mutual interference between signals. The emission signals of all stations are assigned the orthogonal PN codes. Because of the good autocorrelation and cross-correlation properties, mutual interference becomes weaker and signals from different stations could be separated by the preassigned PN codes. At the same time, the spectrum of the emission signal is spreaded, the peak-to-mean envelope power ratio (PMEPR) and the intercepted probability of the signals descend therefore. Simulation results show the good performance of the proposed approach.

Comparison of Two Waveform Design Methods Based on MI and SINR

2013 ◽  
Vol 427-429 ◽  
pp. 1076-1079
Author(s):  
Bin Wang ◽  
Jin Kuan Wang ◽  
Xin Song ◽  
Feng Ming Xin
Keyword(s):  
System Design ◽  
Energy Allocation ◽  
Waveform Design ◽  
Radar System ◽  
Design Methods ◽  
Signal Model ◽  
Ground Clutter ◽  
Radar Systems ◽  
Simulation Results

Modern radar systems should transmit different waveforms according to different environment. Waveform design is an important problem in radar system design. In this paper, we compare two waveform design methods based on MI and SINR with the signal model of a Gaussian target ensemble in ground clutter. The simulation results show that for the different tasks of radar, the energy allocation modes are different. Finally, the whole paper is summarized.

Anti-Jamming and LPI Radar with Spread Spectrum Technology

2011 ◽  
Vol 219-220 ◽  
pp. 57-60
Author(s):  
Lian Qing Fu ◽  
Li Sheng Yang ◽  
Ya Ning Ma ◽  
Tao Wang
Keyword(s):  
Computer Simulations ◽  
Spread Spectrum ◽  
Signal To Noise Ratio ◽  
Radar System ◽  
Signal To Noise ◽  
Detection Range ◽  
Emission Signal ◽  
Low Probability ◽  
Low Probability Of Intercept ◽  
Spread Spectrum Signals

In order to enhance the capability of anti-jamming and Low Probability of Intercept (LPI) of radar system, spread spectrum signals are designed for modern radar system. Emission signal is coded with PN codes at the transmitting terminal. Spectrum of signal is spreaded and multi-signal mixed together, so it is not easy to intercept. At the receiving terminal, undesired signals are spreaded when dispreading desired signal. Signal to noise ratio (SNR) of the received signals is raised after despreading, so the detection range broadens. Computer simulations verify the good performance of the proposed approach.

scholarly journals Special MISO-SAR and MIMO-SAR Modes for Bidirectional Imaging

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Hai Jiang ◽  
Hongjun Song ◽  
Lei Guo ◽  
Wei Wang
Keyword(s):  
System Design ◽  
Multiple Input Multiple Output ◽  
Mutual Interference ◽  
Synthetic Aperture ◽  
Signal Ratio ◽  
Single Output ◽  
Grating Lobe ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Simulation Results

The paper proposes special multiple-input single-output synthetic aperture radar (MISO-SAR) and multiple-input multiple-output SAR (MIMO-SAR) for bidirectional imaging, which can simultaneously illuminate two areas from different directions in azimuth. For the proposed MISO-SAR, two subpulses with the same carrier frequency and phase coding are transmitted with different azimuth directions by switching the phase coefficients in the transmit modules, and echoes corresponding to the subpulses are received by the main lobe and the first grating lobe of the whole antenna. To suppress mutual interference, the two subpulses are transmitted with different range-frequency bands, and their echoes are demodulated and recorded in different channels in the proposed MIMO-SAR. This paper presents the system design of these modes and analyzes their azimuth ambiguity to signal ratio (AASR). Besides, simulation results on points are carried out to validate the proposed bidirectional imaging modes.

A Novel Method for Pulse Integration in Radar-Probing System

2012 ◽  
Vol 529 ◽  
pp. 23-28
Author(s):  
Ya Ming Xi ◽  
Rong Jiu Huang ◽  
Yan Jing Han ◽  
Qing Zhang
Keyword(s):  
Spread Spectrum ◽  
Cross Correlation ◽  
Pulse Sequence ◽  
Side Lobe ◽  
Bipolar Pulse ◽  
System A ◽  
Low Sidelobe ◽  
M Sequence ◽  
Novel Method ◽  
Correlation Properties

In this paper, a novel method for pulse integration in radar-probing system is proposed to yield a low sidelobe response. According to m-sequence widely used in spread spectrum communication system, a bipolar pulse sequence is designed in this paper. At the receiving end, the envelop-detected signal is processed by a corresponding algorithm which dilutes the range sidelobe influence much. Because of the good autocorrelation and cross-correlation properties, waveforms yield a low sidelobe response and major lobe to side lobe ratio can reach 30dB or more, which is easy to satisfy the practical requirements. Simulation results show the good performance of the proposed approach. Furthermore, the approach is compatible to the conventional radars and can also be applied to the upgrade of radar.

SIMULATION OF DIRECT SPREAD SPECTRUM COMMUNICATION SYSTEM ON THE HARDWARE MODULE EMONA DATEX. EVALUATION OF THE EFFECT OF NOISE ON THE QUALITY OF DEMODULATION

2019 ◽  
Author(s):  
Maksim Zhmakin ◽  
Irina Chadyuk ◽  
Aleksey Nadymov
Keyword(s):  
Spread Spectrum ◽  
Communication System ◽  
Spread Spectrum Communication ◽  
Direct Spread ◽  
Simulation Results

A variant of implementation of a communication system with direct spread spectrum is presented in this article, simulation results are also presented, the main parameters of the system are taken, and conclusions are drawn.

Comparative Study on Spreading Codes

2017 ◽  
Vol MCSP2017 (01) ◽  
pp. 14-16
Author(s):  
Omprava Agasti ◽  
Sujatarani Raut ◽  
Shibashis Pradhan
Keyword(s):  
Communication Networks ◽  
Spread Spectrum ◽  
Cross Correlation ◽  
Additive White Gaussian Noise ◽  
Personal Communication ◽  
Spreading Codes ◽  
Personal Communication Networks ◽  
Transmission Data ◽  
Commercial Applications ◽  
Spread Spectrum Systems

In this paper, we studied on spreading code for wireless communication, their performance analysis, applications and its implementation. Spread-spectrum systems have found important commercial applications in CDMA cellular networks and wireless personal communication networks. Implementation is complex, mainly because spreading the baseband (by a factor that can be several orders of magnitude) forces the electronics to act and react accordingly, which, in turn, makes the spreading and dispreading operation necessary. In spread spectrum the transmission signal bandwidth is much higher than the information bandwidth. The signal occupies a bandwidth much larger than what is necessary to send the information in spread spectrum technology. CDMA uses unique spreading codes to spread the baseband data before transmission data. The performance of a CDMA system gets controlled by two types of interference, namely ISI and MAI which are the function of auto and cross correlation values of the spreading codes respectively. The existing codes using Additive White Gaussian Noise channel under multi-user has been compared with the Bit Error Rate(BER) performance.

scholarly journals Peak-to-average power ratio reduction based on Cross-Correlation in OFDM systems

2014 ◽  
Author(s):  
Mohsen Kazemian ◽  
Pooria Varahram ◽  
Shaiful Jahari B. Hashim ◽  
Borhanuddin B. Mohd. Ali ◽  
Somayeh Mohammady ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Average Power ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Power Ratio Reduction ◽  
Ratio Reduction
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