scholarly journals Low-Cost Livestock Global Positioning System Collar from Commercial Off-the-Shelf Parts

2019 ◽  
Vol 72 (6) ◽  
pp. 954-958
Author(s):  
Jason W. Karl ◽  
James E. Sprinkle
Keyword(s):  
Global Positioning System ◽  
Low Cost ◽  
Positioning System ◽  
Global Positioning ◽  
Commercial Off The Shelf

scholarly journals In-motion Alignment of a Low-cost GPS/INS under Large Heading Error

2014 ◽  
Vol 68 (2) ◽  
pp. 355-366 ◽  
Author(s):  
Burak H. Kaygısız ◽  
Bekir Şen
Keyword(s):  
Global Positioning System ◽  
Inertial Navigation System ◽  
Low Cost ◽  
Positioning System ◽  
Performance Tests ◽  
Alignment Procedure ◽  
Attitude Error ◽  
Global Positioning ◽  
New Type ◽  
Navigation Accuracy

This paper presents a new type of Global Positioning System/Inertial Navigation System (GPS/INS) providing higher navigation accuracy under large initial heading error. The mechanization introduced is applicable to low cost GPS/INS systems and enhances the performance when the heading error is large. The proposed approach has the capability to decrease large heading errors very quickly and can start the strapdown navigation computations under poor heading accuracy without any special alignment procedure. Although the design is applicable to land, sea and aerial vehicles, a land vehicle is used for the performance tests. The test is conducted around a closed path and the proposed system is compared to a GPS/INS system based on small attitude error assumption. The performance of both systems is given in this paper.

scholarly journals DGPS Enhancement to GPS NMEA Output Data: DGPS by Correction Projection to Position-Domain

2012 ◽  
Vol 66 (2) ◽  
pp. 249-264 ◽  
Author(s):  
Byungwoon Park ◽  
Jeongkeun Lee ◽  
Younsil Kim ◽  
Ho Yun ◽  
Changdon Kee
Keyword(s):  
Global Positioning System ◽  
Projection Algorithm ◽  
Positioning System ◽  
Drastic Reduction ◽  
Output Data ◽  
Global Positioning ◽  
Limited Applicability ◽  
Rms Error ◽  
Commercial Off The Shelf ◽  
Shift Technique

Most Differential Global Positioning System (DGPS) correction formats are based on range information, and thus typical DGPS systems can be implemented only on correction message-readable or raw observable-providing devices. There is no other way to improve an already-calculated position than a ‘block shift technique’, which has a very limited applicability. This paper suggests an algorithm to project measurement correction directly to position domain data without requiring raw pseudorange data. By post-processing methodology, we evaluated the performance of our new algorithm compared to conventional DGPS, which requires raw pseudorange data; the observed difference between them was only 0·1 mm . The proposed correction projection algorithm can be used with commercial off-the-shelf receivers that provide National Marine Electronics Association (NMEA) format data. Our testing with a U-blox LEA-5H receiver resulted in a drastic reduction of horizontal Root Mean Square (RMS) error from 4·75 m to 1·09 m.

scholarly journals Indoor Localization System Using Wi-Fi Technology

2019 ◽  
pp. 69-77
Keyword(s):  
Global Positioning System ◽  
Indoor Localization ◽  
Tracking System ◽  
Low Cost ◽  
Positioning System ◽  
Test Results ◽  
Localization System ◽  
Transmission Technique ◽  
Wide Range ◽  
Global Positioning

Recently, indoor localization has witnessed an increase in interest, due to the potential wide range of using in different applications, such as Internet of Things (IoT). It is also providing a solution for the absence of Global Positioning System (GPS) signals inside buildings. Different techniques have been used for performing the indoor localization, such as sensors and wireless technologies. In this paper, an indoor localization and object tracking system is proposed based on WiFi transmission technique. It is done by distributing different WiFi sources around the building to read the data of the tracked objects. This is to measure the distance between the WiFi receiver and the object to allocate and track it efficiently. The test results show that the proposed system is working in an efficient way with low cost.

scholarly journals An Onboard Vision-Based System for Autonomous Landing of a Low-Cost Quadrotor on a Novel Landing Pad

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4703 ◽  
Author(s):  
Liu ◽  
Zhang ◽  
Tian ◽  
Liu
Keyword(s):  
Dynamic Model ◽  
Global Positioning System ◽  
Pose Estimation ◽  
Low Cost ◽  
Positioning System ◽  
Autonomous Landing ◽  
Global Positioning ◽  
Optical Markers ◽  
Vision Algorithm ◽  
Landing Control

In this paper, an onboard vision-based system for the autonomous landing of a low-cost quadrotor is presented. A novel landing pad with different optical markers sizes is carefully designed to be robustly recognized at different distances. To provide reliable pose information in a GPS (Global Positioning System)-denied environment, a vision algorithm for real-time landing pad recognition and pose estimation is implemented. The dynamic model of the quadrotor is established and a system scheme for autonomous landing control is presented. A series of autonomous flights have been successfully performed, and a video of the experiment is available online. The efficiency and accuracy of the presented vision-based system is demonstrated by using its position and attitude estimates as control inputs for the autonomous landing of a self-customized quadrotor.

scholarly journals A Low-Cost System for Measuring Horizontal Winds from Single-Engine Aircraft

2014 ◽  
Vol 31 (6) ◽  
pp. 1312-1320 ◽  
Author(s):  
Stephen A. Conley ◽  
Ian C. Faloona ◽  
Donald H. Lenschow ◽  
Anna Karion ◽  
Colm Sweeney
Keyword(s):  
Global Positioning System ◽  
Measurement System ◽  
Low Cost ◽  
Horizontal Wind ◽  
Positioning System ◽  
Cost System ◽  
Upper Limit ◽  
Global Positioning ◽  
True Airspeed ◽  
Wind Measurements

Abstract The implementation and accuracy of a low-rate (~1 Hz) horizontal wind measurement system is described for a fixed-wing aircraft without modification to the airframe. The system is based on a global positioning system (GPS) compass that provides aircraft heading and a ground-referenced velocity, which, when subtracted from the standard true airspeed, provides estimates of the horizontal wind velocity. A series of tests was performed flying “L”-shaped patterns above the boundary layer, where the winds were assumed to be horizontally homogeneous over the area bounded by the flight (approximately 25 km2). Four headings were flown at each altitude at a constant airspeed. Scaling corrections for both heading and airspeed were found by minimizing the variance in the 1-s wind measurements; an upper limit to the error was then computed by calculating the variance of the corrected wind measurements on each of the four headings. A typical uncertainty found in this manner tends to be less than 0.2 m s−1. The measurement system described herein is inexpensive and relatively easy to implement on single-engine aircraft.

Low-Cost Global Positioning System Harness for Pampas Deer

2009 ◽  
Vol 73 (3) ◽  
pp. 452-457 ◽  
Author(s):  
Carlos André Zucco ◽  
Guilherme Mourão
Keyword(s):  
Global Positioning System ◽  
Low Cost ◽  
Positioning System ◽  
Global Positioning

Miniaturization and Low-Cost Microstrip Antenna Design for GPS Receiver

2013 ◽  
Vol 765-767 ◽  
pp. 2736-2741
Author(s):  
Hong Gang Hao ◽  
Shao Wen Wang ◽  
Hua Xiao Lu ◽  
Wei Ruan
Keyword(s):  
Global Positioning System ◽  
Microstrip Antenna ◽  
Low Cost ◽  
Antenna Design ◽  
Positioning System ◽  
Test Results ◽  
Gps Receiver ◽  
Experimental Basis ◽  
Practical Applications ◽  
Global Positioning

As the key components of the receiver in the GPS(Global Positioning System) system, the performance of the antenna has an important impact on the accuracy of navigation and positioning for a GPS receiver. The paper shows a novel microstrip antenna on the basis of the slot loaded method. The simulated results and the experimental test results indicate that the characteristics of impedance and circular polarization, as well as the radiation pattern of the proposed antenna can meet the requirements of the applications of GPS, which provides the theoretical and experimental basis for the practical applications of the proposed antenna.

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