THE DOPLOC DARK SATELLITE TRACKING SYSTEM

1963 ◽  
Author(s):  
A. L. G . DeBay ◽  
V. W. Richard
Keyword(s):  
Tracking System ◽  
Satellite Tracking

The Research on Phantom-Bit Technology of Digital Phase Shifters for Satellite Tracking System of Phase Array

2014 ◽  
Vol 644-650 ◽  
pp. 4555-4558
Author(s):  
Chao Hai Li ◽  
Wen Xian Jiang ◽  
Guo Long Wang
Keyword(s):  
High Speed ◽  
Phased Array ◽  
Tracking System ◽  
Correlation Method ◽  
Digital Signal ◽  
Satellite Tracking ◽  
Phase Shifters ◽  
Phase Array ◽  
Satellite Platform ◽  
Beam Displacement

Phased array satellite platform self-tracking system is for the stability between the missiles and other high-speed movement of the platform and the relay satellite two-way information transmission needs to carry out the self-tracking technology research of onboard platform-dimensional active phased array satellite. The system uses a sub-array correlation method for accurate measurement of the angle of the satellite signal. Receiving array is divided into four 4 * 4 sub-array, each antenna signal combining unit 4 sub array for 4-way A / D to be converted, through down-conversion, filtering, extraction and other processes to get a digital baseband signal, the baseband digital signal processing is to extract the angle error information into digital beam orientation system for tracking filtering operation, thereby ensuring that the transceiver has been aligned with the satellite antenna beam direction. In this paper ,phantom-bit technology for satellite tracking system under the condition of minimum beam displacement is researched for satellite tracking system.

Design of Computer Communication and Network in APOSOS Project

2011 ◽  
Vol 271-273 ◽  
pp. 700-705 ◽  
Author(s):  
You Zhao ◽  
Peng Qi Gao ◽  
Ming Shen ◽  
Xiao Zhong Guo ◽  
Da Tao Yang ◽  
...  
Keyword(s):  
Member State ◽  
Space Debris ◽  
Tracking System ◽  
Satellite Observation ◽  
Satellite Tracking ◽  
Asia Pacific ◽  
Observation System ◽  
Computer Communication ◽  
Observation Network ◽  
Observation Plan

Asia-Pacific Optical Satellite Observation System (APOSOS) is based on members of Asia-Pacific Space Cooperation Organization (APSCO). Its aim is to develop a regional or even global satellite tracking system basically composed of optical trackers. The system will be used to track objects of interest or space-debris for the safety of spacecraft launch mission or the intactness of operational satellites. APOSOS is composed of Asia-Pacific optical satellite observation center, APSCO member state node, sub-node and observation telescope. Asia-Pacific optical satellite observation center manage the whole observation network. Every member state node answers for the organization of observation with their country’s facility according to the observation plan released by observation center. The sub-node transmits observational data to corresponding member state node first. Then the member state node transmits the data summarized to the observation center. This paper will briefly introduce the APOSOS project first and present the design of computer communication and network in APOSOS project in detail.

scholarly journals Flexible and extendable advance satellite tracking system

2018 ◽  
Vol 7 (4.13) ◽  
pp. 10
Author(s):  
Mohamed Tarmizi Ahmad ◽  
Michael Lam ◽  
Razali Abidin ◽  
Shikin Razali ◽  
Amzari Zhahir
Keyword(s):  
Research Collaboration ◽  
Tracking System ◽  
Satellite Tracking ◽  
Data Monitoring ◽  
Position Information ◽  
Flight Data ◽  
Military Applications ◽  
Aircraft Tracking ◽  
Potential Applications ◽  
System Characteristics

Aircraft tracking via satellite uses four dimensional aircraft position information to enhance flight safety by recording, scrutinizing and visualizing the information generated by an Airborne Tracking Unit (ATU) fitted onboard of aircraft flying from one point to another. It is an important device for aircraft operator to ensure its operational safety. Starfish Tracker SF3100-1 aircraft tracking unit can be used in aircraft satellite tracking applications. Research collaboration between Worldgate Technologies (WGT), Universiti Pertahanan Nasional Malaysia (UPNM) and Universiti Putra Malaysia (UPM) has developed the ATU originally from land base to airborne vehicles tracking, hence it provides multitudes of civil and military applications. The ATU is a unique device that enables multi-tasking application such as Air Combat Manoeuvring Instrumentation (ACMI), Network Centric Warfare and Flight Data Monitoring systems. In this paper, system characteristics and its applications are presented with the potential applications for Flight Data Monitoring system.  

A Hybrid PSO-PI Controller for the LEO Satellite Tracking System

2014 ◽  
Vol 912-914 ◽  
pp. 1069-1072
Author(s):  
Te Jen Su ◽  
Jui Chuan Cheng ◽  
Ming Yuan Huang ◽  
Xun Xain Zhan
Keyword(s):  
Tracking System ◽  
Pso Algorithm ◽  
Satellite Tracking ◽  
Pi Controller ◽  
Feedback Mechanism ◽  
Low Earth Orbit ◽  
Search Process ◽  
Routing Mechanism ◽  
Leo Satellite ◽  
Angle Indicator

This paper presents a smart-routing mechanism of a control system to track Low Earth Orbit (LEO) satellites. Satellite tracking mainly relies on the antenna pointing database generated by SGP4 orbit forecasting model and follow the point coordinates to command the rotation of the axes. Gears rotation gaps will affect the strength of the received signal; the Proportional Integral (PI) controller is used to adjust the error values caused by the drive shaft mechanism. Particle swarm optimization (PSO) algorithm has fewer parameter settings and the advantages of fast convergence, which is adopted for variable selection and optimization for the parameters kp and ki of PI controller. The resolver feedback mechanism of actual angle indicator is using as a basis for performance adjustment in the search process. The experimental results of a three axes tracking system demonstrate the reliability and better performance of the proposed PSO-PI satellite tracking system.

Wildlife tracking technology options and cost considerations

2011 ◽  
Vol 38 (8) ◽  
pp. 653 ◽  
Author(s):  
Bindi Thomas ◽  
John D. Holland ◽  
Edward O. Minot
Keyword(s):  
Case Studies ◽  
Tracking System ◽  
Satellite Tracking ◽  
Gps Tracking ◽  
Technology Choice ◽  
Long Distance ◽  
Wildlife Tracking ◽  
Choice Decision ◽  
Project Objectives ◽  
Tracking Technology

Context Continued demand for long-distance remote wildlife tracking has resulted in the development of a variety of satellite tracking technologies. Choosing an appropriate satellite tracking system for a project involves financial, technical and operational tradeoffs associated with different systems. Aim The aim of the present research was to assess the technology options and associated costs to help wildlife researchers select the best tracking solution for their needs. Methods A technology-choice decision guide was developed to assist wildlife scientists select an optimal tracking technology. We undertook four satellite tracking case studies involving avian, aquatic and terrestrial species living in diverse environments around the world and use these case studies to validate and test the technology-choice decision guide and to calculate the cost effectiveness of alternative tracking methods. Technologies used in marine tracking were out of the scope of the present paper. Key results Choosing the tracking method best suited for a project requires (1) clearly specifying the data required to meet project objectives, (2) understanding the constraints imposed by the study species and its environment, and (3) calculating the net cost per datum of the various tracking methods available. Key conclusions We suggest that, in most circumstances, global positioning system (GPS) tracking is preferable to other options. However, where weight and environmental limitations prevent the use of GPS, alternatives such as Argos satellite Doppler-based positions (Argos) or very high frequency (VHF) can function adequately. Implications The present paper provides simplified criteria for selecting the best wildlife satellite tracking technology for different situations.

scholarly journals Drogue-Loss Detection for Surface Drifters during the Lagrangian Submesoscale Experiment (LASER)

2018 ◽  
Vol 35 (4) ◽  
pp. 705-725 ◽  
Author(s):  
A. C. Haza ◽  
E. D’Asaro ◽  
H. Chang ◽  
S. Chen ◽  
M. Curcic ◽  
...  
Keyword(s):  
Tracking System ◽  
Satellite Tracking ◽  
Wind Forcing ◽  
Storm Events ◽  
Material Dispersion ◽  
Surface Flows ◽  
Winter Conditions ◽  
Different Depths ◽  
Surface Drifters ◽  
Steep Waves

AbstractThe Lagrangian Submesoscale Experiment (LASER) was designed to study surface flows during winter conditions in the northern Gulf of Mexico. More than 1000 mostly biodegradable drifters were launched. The drifters consisted of a surface floater extending 5 cm below the surface, containing the satellite tracking system, and a drogue extending 60 cm below the surface, hanging beneath the floater on a flexible tether. On some floats, the drogue separated from the floater during storms. This paper describes methods to detect drogue loss based on two properties that distinguish drogued from undrogued drifters. First, undrogued drifters often flip over, pointing their satellite antenna downward and thus intermittently reducing the frequency of GPS fixes. Second, undrogued drifters respond to wind forcing more than drogued drifters. A multistage analysis is used: first, two properties are used to create a preliminary drifter classification; then, the motion of each unclassified drifter is compared to that of its classified neighbors in an iterative process for nearly all of the drifters. The algorithm classified drifters with a known drogue status with an accuracy of virtually 100%. Drogue loss times were estimated with a precision of less than 0.5 and 3 h for 60% and 85% of the drifters, respectively. An estimated 40% of the drifters lost their drogues in the first 7 weeks, with drogue loss coinciding with storm events, particularly those with steep waves. Once the drogued and undrogued drifters are classified, they can be used to quantify the differences in material dispersion at different depths.

Study of Vehicle Vibration for High-Performance Land Mobile Satellite Tracking System for Telemedicine

2014 ◽  
Vol 5 (2) ◽  
pp. 27-48
Author(s):  
Toshihiko Kitano
Keyword(s):  
High Performance ◽  
Tracking System ◽  
Satellite Tracking ◽  
Data Communications ◽  
The Road ◽  
Vibration Data ◽  
Road Surfaces ◽  
Past Data ◽  
On The Road ◽  
Mobile Satellite

The land mobile satellite service (LMSS) is a key component of telemedicine and an important technology for grasping the status of a patient in an ambulance. However, rough road surfaces can destabilize satellite tracking and disturb data communications with the ambulance carrying the patient. Nevertheless, accurate estimates of the location of the vehicle at any given time and rapid reconfiguration of the tracking antenna based on past data can allow stable and effective data communications. This study examined positions characterized by large vibration amplitudes from past data on vehicle vibrations due to rough road surfaces as feature points to provide the vehicle system in advance with reference pitch angle vibration data. Drawing on reference vibration data for convolution and a cost function, The authors synchronized past data with real-time vibration data and accurately estimated the point at which the ambulance or other vehicle passes on the road. They also discuss limits on the range of vibrations that can be used for data synchronization. This study demonstrates that the present method enables high-precision estimates of vehicle location.

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