scholarly journals Frequency Domain Acquisition Method for Dual-System GNSS

2014 ◽  
Author(s):  
Zhang Zhan ◽  
Xiong Zhang ◽  
Zhang Xiaolin ◽  
Su Linlin
Keyword(s):  
Frequency Domain ◽  
Dual System ◽  
Acquisition Method ◽  
Domain Acquisition

Research on Acquisition and Tracing Algorithm of GPS Receiver

2012 ◽  
Vol 229-231 ◽  
pp. 1556-1559
Author(s):  
Wen Zhong Ma ◽  
Zhi Wang ◽  
Yao Rong Li ◽  
Wei Zhang
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Correlation Property ◽  
Gps Receiver ◽  
Carrier Wave ◽  
Intermediate Data ◽  
Navigation Message ◽  
Tracing Algorithm ◽  
Domain Acquisition

An acquisition and tracing algorithm of GPS receiver is introduced. The shortage of time domain acquisition algorithm is pointed out by analyzing the composition of GPS signal and C/A code’s correlation property. Then the frequency domain acquisition algorithm is discussed. The carrier wave track loop and C/A code track loop are designed and the algorithms of them are determined. Using these two loops can get the navigation message, etc that used for positioning and navigation. The GPS raw intermediate data is processed and the satellites signals are acquired and traced in MATLAB, then obtain the navigation message verified the feasibility and availability of the acquisition and tracing algorithm.

A reduced complexity frequency domain acquisition of DS-SS signals for embedded applications

2005 ◽  
Author(s):  
David Akopian ◽  
Phani K. Sagiraju ◽  
Sos Agaian ◽  
G. V. Raju
Keyword(s):  
Frequency Domain ◽  
Reduced Complexity ◽  
Embedded Applications ◽  
Domain Acquisition

scholarly journals Frequency-domain acquisition of fourth-order correlation by spectral intensity interferometry

2013 ◽  
Vol 21 (20) ◽  
pp. 23206 ◽  
Author(s):  
Sucbei Moon ◽  
Heeso Noh ◽  
Dug Young Kim
Keyword(s):  
Frequency Domain ◽  
Fourth Order ◽  
Spectral Intensity ◽  
Intensity Interferometry ◽  
Domain Acquisition

scholarly journals Accurate and Autonomous Star Acquisition Method for Star Sensor under Complex Conditions

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Hao Zhang ◽  
Yanxiong Niu ◽  
Jiazhen Lu ◽  
He Zhang
Keyword(s):  
Frequency Domain ◽  
Laboratory Experiments ◽  
High Accuracy ◽  
Nonlinear Filter ◽  
Attitude Measurement ◽  
Star Sensor ◽  
Excellent Performance ◽  
Star Image ◽  
Image Simulations ◽  
Acquisition Method

Star sensor is a preferred attitude measurement device for its extremely high accuracy. Star acquisition is the essential and critical procedure, which is aiming at acquiring accurate star areas. However, degenerated acquisition results under complex conditions become one of the major restrictions for modern star sensor. In this paper, an accurate and autonomous star acquisition method is proposed. Mathematical morphology and variable thresholding are combined for accurate star extraction; motion PSF is estimated in frequency domain and nonlinear filter is adopted for star restoration. Accurate star acquisition can be achieved based on only one star image. Simulations and laboratory experiments are conducted for verification. Several existing methods are also reproduced for comparison. Acquisition results demonstrate that the proposed method is effective and an excellent performance can be achieved autonomously under complex conditions, along with more detected stars and improved acquisition accuracy.

Correction to "The analysis of slug tests in the frequency domain" (WRR 25(11), pp. 2388-2396

1990 ◽  
Vol 26 (8) ◽  
pp. 1863-1863
Author(s):  
Paul Marschall ◽  
Baldur Barczewski
Keyword(s):  
Frequency Domain ◽  
Slug Tests
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