scholarly journals Design of a Low-Cost Indoor Navigation System for Food Delivery Robot Based on Multi-Sensor Information Fusion

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4980 ◽  
Author(s):  
Yunlong Sun ◽  
Lianwu Guan ◽  
Zhanyuan Chang ◽  
Chuanjiang Li ◽  
Yanbin Gao
Keyword(s):  
Information Fusion ◽  
Low Cost ◽  
Wide Band ◽  
Indoor Navigation ◽  
Ultra Wide Band ◽  
Steering Control ◽  
Labor Costs ◽  
Effective Manner ◽  
The Impact ◽  
Meal Delivery

As the restaurant industry is facing labor shortage issues, the use of meal delivery robots instead of waiters/waitresses not only allows the customers to experience the impact of robot technology but also benefits the restaurant business financially by reducing labor costs. Most existing meal delivery robots employ magnetic navigation technologies, which require magnetic strip installation and changes to the restaurant decor. Once the moving path is changed, the magnetic strips need to be re-laid. This study proposes multisource information fusion, i.e., the fusion of ultra-wide band positioning technology with an odometer and a low-cost gyroscope accelerometer, to achieve the positioning of a non-rail meal delivery robot with navigation. By using a low-cost electronic compass and gyroscope accelerometer, the delivery robot can move along a fixed orbit in a flexible and cost-effective manner with steering control. Ultra-wide band (UWB) and track estimation algorithm are combined by extended Kalman filter (EKF), and the positioning error after fusion is about 15 cm, which is accepted by restaurants. In summary, the proposed approach has some potential for commercial applications.

scholarly journals The Impact Of HIV/AIDS On International Human Resource Management

2011 ◽  
Vol 6 (3) ◽  
Author(s):  
Susan Baxter
Keyword(s):  
Competitive Advantage ◽  
Low Cost ◽  
Labor Costs ◽  
Level Of Involvement ◽  
Global Workforce ◽  
To Come ◽  
Multinational Businesses ◽  
The Impact ◽  
Hiv Aids ◽  
Labor Pools

Economies of global scope afford businesses a competitive advantage. One way to utilize this advantage is to coordinate the leveraging of resources especially labor. Businesses have attempted to minimize labor costs and risks in an effort to maintain or increase competitive advantage. There is a risk to the global workforce: HIV/AIDS. This disease is striking at the heart of low cost labor pools. The impact on business is being felt now and will be felt for years to come. How large the impact is depends on the level of involvement of multinational businesses in the fight against HIV/AIDS. Multinational businesses must develop policies and procedures to combat this illness, as it is devastating labor pools in various parts of the world.

scholarly journals Impact of Delay Spread on IEEE 802.15.4a Networks with Energy Detection Receivers

2010 ◽  
Vol 8 (03) ◽  
Author(s):  
P. Medina ◽  
J. R. Gallardo ◽  
J. Sánchez ◽  
F. Ramírez-Mireles
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Wide Band ◽  
Energy Detection ◽  
Ultra Wide Band ◽  
Delay Spread ◽  
Multiuser Interference ◽  
Ieee 802.15.4A ◽  
Industrial Environments ◽  
The Impact

This work analyzes the impact of delay spread on IEEE 802.15.4a networks using energy detection (ED) receivers.Specifically, we review the typical values for delay spread in Ultra Wide Band (UWB) systems reported to date for indoor, outdoor and industrial environments, and study how the delay spread impacts the bit-error rate with and without Multiuser Interference (MUI).

On the Impact of Ultra Wide Band (UWB) on Macrocell Downlink of CDMA-PCS System

2006 ◽  
Vol 43 (2) ◽  
pp. 355-367
Author(s):  
Bazil Taha-Ahmed ◽  
Miguel Calvo-Ramón ◽  
Leandro Haro-Ariet
Keyword(s):  
Wide Band ◽  
Ultra Wide Band ◽  
The Impact

scholarly journals Wide-Band Interference Mitigation in GNSS Receivers Using Sub-Band Automatic Gain Control

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 679
Author(s):  
Johannes Rossouw van der van der Merwe ◽  
Fabio Garzia ◽  
Alexander Rügamer ◽  
Santiago Urquijo ◽  
David Contreras Franco ◽  
...  
Keyword(s):  
Interference Mitigation ◽  
Automatic Gain Control ◽  
Low Cost ◽  
Poor Performance ◽  
Wide Band ◽  
Band Noise ◽  
Gnss Receivers ◽  
Interference Signals ◽  
Wide Band Noise ◽  
The Impact

The performance of GNSS receivers is significantly affected by interference signals. For this reason, several research groups have proposed methods to mitigate the effect of different kinds of jammers. One effective method for wide-band IM is the HDDM PB. It provides good performance to pulsed and frequency sparse interference. However, it and many other methods have poor performance against wide-band noise signals, which are not frequency-sparse. This article proposes to include AGC in the HDDM structure to attenuate the signal instead of removing it: the HDDM-AGC. It overcomes the wide-band noise limitation for IM at the cost of limiting mitigation capability to other signals. Previous studies with this approach were limited to only measuring the CN0 performance of tracking, but this article extends the analysis to include the impact of the HDDM-AGC algorithm on the PVT solution. It allows an end-to-end evaluation and impact assessment of mitigation to a GNSS receiver. This study compares two commercial receivers: one high-end and one low-cost, with and without HDDM IM against laboratory-generated interference signals. The results show that the HDDM-AGC provides a PVT availability and precision comparable to high-end commercial receivers with integrated mitigation for most interference types. For pulse interferences, its performance is superior. Further, it is shown that degradation is minimized against wide-band noise interferences. Regarding low-cost receivers, the PVT availability can be increased up to 40% by applying an external HDDM-AGC.

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