Spread spectrum time-resolved photon migration imaging system: the principle and simulation results

2003 ◽  
Author(s):  
Nan Guang Chen ◽  
Quing Zhu
Keyword(s):  
Spread Spectrum ◽  
Imaging System ◽  
Photon Migration ◽  
Time Resolved ◽  
Migration Imaging ◽  
Simulation Results

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.

Investigation of time-resolved proton radiography using x-ray flat-panel imaging system

2017 ◽  
Vol 62 (5) ◽  
pp. 1905-1919 ◽  
Author(s):  
K-W Jee ◽  
R Zhang ◽  
E H Bentefour ◽  
P J Doolan ◽  
E Cascio ◽  
...  
Keyword(s):  
Imaging System ◽  
Flat Panel ◽  
Proton Radiography ◽  
Time Resolved ◽  
X Ray ◽  
Flat Panel Imaging

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.

scholarly journals Detecting the Trajectory of Moving Object for Single-Pixel Imaging System

2018 ◽  
Vol 160 ◽  
pp. 07002
Author(s):  
Shao Hui ◽  
Wu Dongsheng ◽  
Chen Jie ◽  
Li Zhao ◽  
Xu Xiaoxue ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Compressed Sensing ◽  
Imaging System ◽  
Moving Object ◽  
Weighted Sum ◽  
Angle Change ◽  
Ideal Situation ◽  
Simulation Results ◽  
Orientation Parameters ◽  
Single Pixel

In order to get the trajectory of moving object using single-pixel imaging system, an algorithm is proposed. The same pseudorandom masks are employed to illuminate the different time scene. A time weighted sum of the background correction signals is employed to get the trajectory information using compressed sensing (CS) method. In ideal situation, we can obtain other parameters (e.g., speed, orientation) besides the trajectory. However, the reflective intensity of the object can be change due to the reflective angle change caused by the motion in some situations. This will mislead for achieving the speed, orientation parameters. In order to eliminate this effect, a division method is utilized. At last, the computer simulation results prove the effect validity of the proposed algorithm.

scholarly journals Time-resolved photon migration in bi-layered tissue models

2005 ◽  
Vol 13 (19) ◽  
pp. 7466 ◽  
Author(s):  
Karthik Vishwanath ◽  
Mary-Ann Mycek
Keyword(s):  
Photon Migration ◽  
Time Resolved ◽  
Tissue Models

Anti-Stealth Radar with Spread Spectrum Technology

2011 ◽  
Vol 474-476 ◽  
pp. 2079-2084 ◽  
Author(s):  
Lian Qing Fu ◽  
Li Sheng Yang ◽  
He Tang ◽  
Ya Ning Ma
Keyword(s):  
Spread Spectrum ◽  
Signal To Noise ◽  
Intercept Probability ◽  
Simulation Results ◽  
Stealth Radar

The paper addresses the realization of anti-stealth radar and the problems which modern radars are confronted with. With the application of spread spectrum technology to radars, the capability of anti-stealth and anti-jamming is improved. Signal-to-noise (SNR) of the receiver increases through raising the launching power. Intercept probability decreases by transmitting multiple PN codes. Range of radar detector increases on condition that the intercept probability is unchanged. Simulation results show the validity of the proposed method.

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