Results 31 to 40 of about 701,425 (185)

Error Analysis and Compensation of Roll-Pitch Semi-Strapdown Photo-Electricity Stabilized Platform [PDF]

Hangkong bingqi, 2021
In order to improve the pointing accuracy of roll-pitch semi-strapdown photo-electricity stabilized platform, a method for error modeling and parameter calibration of stabilized platform is proposed.
Zhao Yixin, Cui Hao, Chen Xiaozeng, Ding Haishan
doaj   +1 more source

Optical Wireless Performance Monitoring Using Asynchronous Amplitude Histograms

IEEE Photonics Journal, 2021
Optical performance monitoring (OPM) aims to estimate the amount of distortion in optical networks. Its importance relies on building robust and efficient networks with self and dynamic diagnosis.
Maged Abdullah Esmail
doaj   +1 more source

Multiple Transmitters for Gain Saturated Pre-Amplified FSO Communication Systems Limited by Strong Atmospheric Turbulence and Pointing Error

IEEE Access, 2023
The use of multiple transmitters in a turbulent free-space optical (FSO) communication link can enhance the systems performance because greater received power can improve receiver sensitivity. Nevertheless, the effect of having more power at the receiver
Jeremiah Oluwatosin Bandele, Ayodeji Olalekan Salau, Mmoloki Mangwala, Adamu Murtala Zungeru   +3 more
doaj   +1 more source

Maximum likelihood analysis of systematic errors in interferometric observations of the cosmic microwave background [PDF]

, 2013
We investigate the impact of instrumental systematic errors in interferometric measurements of the cosmic microwave background (CMB) temperature and polarization power spectra.
Andrei Korotkov, Ata Karakci, Battistelli, Benjamin D. Wandelt, Bond, Bunn, Bunn, Bunn, Bunn, Bunn, Bunn, Bunn, Emory F. Bunn, Gorski, Gregory S. Tucker, Guth, Hu, Hu, Kamionkowski, Kamionkowski, Kendall, Komatsu, Larson, Le Zhang, Lewis, Lewis, Miller, Myers, O'Sullivan, Park, Park, Paul M. Sutter, Pearson, Peter Timbie, Scott, Shimon, Su, Timbie, White, Yadav, Zaldarriaga, Zaldarriaga   +41 more
core   +5 more sources

Modelling Error Rates in Temporal Pointing [PDF]

Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems, 2016
We present a novel model to predict error rates in temporal pointing. With temporal pointing, a target is about to appear within a limited time window for selection. Unlike in spatial pointing, there is no movement to control in the temporal domain; the user can only determine when to launch the response.
Oulasvirta, Antti, Lee, Byungjoo
openaire   +3 more sources

Spatial Power Combining of DSSS Signals From a Sparse Array

IEEE Access, 2019
This paper generalizes the technique of spatial power combining to modulated signals and applies it to effectively strengthen or deny communications and navigation services in desired area.
Xiaofeng Ouyang, Fangling Zeng, Daqian Lv, Wenhao Wang   +3 more
doaj   +1 more source

A Mixed Distribution Model of Pointing Error of Aircraft

Shanghai Jiaotong Daxue xuebao
In the space exploration mission, the aircraft will be affected by mechanical shocks, tracking noise and other factors to cause angular micro-vibration, so that the antenna pointing error is always non-zero, which will affect the communication link ...
CAO Dongping, JING Qingfeng, ZHONG Weizhi
doaj   +1 more source

A Novel Online Estimation and Compensation Method for Strapdown Phased Array Seeker Disturbance Rejection Effect Using Extended State Kalman Filter

IEEE Access, 2019
The radome error and beam pointing error found commonly in the strapdown phased array radar seeker can cause coupling between the missile body motion and the seeker model, impacting the output precision of the seeker and causing the disturbance rejection
Shih-Yao Lin, Defu Lin, Wei Wang
doaj   +1 more source

On Effective Secrecy Throughput of Underlay Spectrum Sharing $\alpha -\mu$/ Málaga Hybrid Model Under Interference-and-Transmit Power Constraints

IEEE Photonics Journal, 2023
The underlay cognitive radio-based hybrid radio frequency/free-space optical (RF/FSO) systems have emerged as a promising technology due to their ability to eliminate spectrum scarcity and spectrum under-utilization problems.
Md. Ibrahim, A. S. M. Badrudduza, Md. Shakhawat Hossen, M. K. Kundu, Imran Shafique Ansari, Imtiaz Ahmed   +5 more
doaj   +1 more source

The Pointing System of the Herschel Space Observatory. Description, Calibration, Performance and Improvements

, 2014
We present the activities carried out to calibrate and characterise the performance of the elements of attitude control and measurement on board the Herschel spacecraft.
Altieri, Bruno, Aussel, Hervé, Feuchtgruber, Helmut, Group, The Herschel Pointing Working, Klaas, Ulrich, Linz, Hendrik, Lutz, Dieter, Marston, Anthony, Merín, Bruno, Müller, Thomas, Nielbock, Markus, Oort, Marc, Pilbratt, Göran, Schmidt, Micha, Stephenson, Craig, Sánchez-Portal, Miguel, Tuttlebee, Mark   +16 more
core   +1 more source