An Indoor Spread Spectrum Acoustic Ranging System

2007 ◽  
Author(s):  
Graeme R. Drysdale ◽  
Liming Dai ◽  
Ron J. Palmer
Keyword(s):  
Spread Spectrum ◽  
Indoor Environment ◽  
Maximum Length ◽  
Multipath Interference ◽  
Gold Codes ◽  
Acoustic Ranging ◽  
Gold Code ◽  
Range Error ◽  
Length Code ◽  
Made In

The design of a spread spectrum acoustic ranging system is presented as an alternative for transmitting and receiving positioning information [1]. Six pseudonoise codes, four maximum length and two Gold codes, are tested in a high multipath indoor environment to assess the system’s accuracy. Range measurements are made in 1 m intervals from 1 to 10 m and the results are shown for a maximum length code and a Gold code which is the modulo-2 addition of two maximum length codes. The average errors are bound between 6 and 20 cm. It appears multipath interference provides the largest contribution to the range error.

Research and Analysis of Accuracy of Location Estimation in Inertial Navigation System

2016 ◽  
Vol 817 ◽  
pp. 308-316 ◽  
Author(s):  
Piotr Rajchowski ◽  
Krzysztof Cwalina ◽  
Jarosław Sadowski
Keyword(s):  
Navigation System ◽  
Indoor Environment ◽  
Inertial Navigation System ◽  
Inertial Navigation ◽  
Digital Signal ◽  
Location Estimation ◽  
Navigation Algorithms ◽  
Movement Parameters ◽  
Measuring Unit ◽  
Made In

In the article the research and analysis of digital signal processing and its influence on accuracy of location estimation in developed inertial navigation system was presented. The purpose of the system is to localize moving people in indoor environment. During research a measuring unit for recording selected movement parameters was made. In the article were also described author’s inertial navigation algorithms.

New Binary Code Combined with New Chaotic Map and Gold Code to Ameliorate the Quality of the Transmission

2017 ◽  
Vol 5 (1) ◽  
pp. 166
Author(s):  
Mohamed Krim ◽  
Adda Ali-Pacha ◽  
Naima Hadj-Said
Keyword(s):  
Spread Spectrum ◽  
Communication Systems ◽  
Binary Code ◽  
Chaotic Map ◽  
Research Problem ◽  
Chaotic Sequence ◽  
Scanning System ◽  
Radio Communications ◽  
Gold Code

<p>While the private radio communications field has grown in recent years, the communication method known as spread spectrum name has gained much prominence. A spread spectrum method can be combined with multiple access method CDMA for dividing sequences to create multi-user communication systems with very good performance of interference between symbols.The production of the chaotic sequence in scanning system and the information system according to DS-CDMA remains a hot research problem in this study to supervise in the knowledge wireless communication. This fact is still a question in establishing the secret code random spread sequence between the transmitter and the receiver.In DS-SS’s spreading is important to embed security information.It can avoid many problems in the complex calculation of the true circle. Furthermore the pseudo chaotic is reconstructed in the conventional gold to change shape with the logical operator “XOR” the results in simulation result shows in progress.It improves also the computing speed as this can solve the new equation of the problem in the original logistic map.There certainly has a kind in design: spreading chaotic sequence, chaos with gold code; including the number of users.So these are less in number and also limit the security and to can improve the ameliorate the quality of the transmissionand performance in terms of allowable number of users.The Bit error rate (BER) performance of the system is evaluated in multi-user environment under AWGN and reveals that the DS-SS system using new binary code combined with new logistic mapand gold code to ameliorate the quality of the transmission.</p>

scholarly journals The PMV and PPD indices in the selected boiler room

2018 ◽  
Vol 44 ◽  
pp. 00021 ◽  
Author(s):  
Robert Cichowicz ◽  
Artur Stelęgowski
Keyword(s):  
Indoor Environment ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Thermal Conditions ◽  
Thermal Processes ◽  
Technological Equipment ◽  
Work Area ◽  
Boiler Room ◽  
Industrial Boiler ◽  
Made In

Thermal microclimate in a boiler room is formed by factors resulting from thermal processes that are taking place in combustion units. These factors are negatively affecting the indoor environment by worsening the air quality, and therefore it is crucial to maintain adequate air parameters in the room. It is a consequence of the fact that in the boiler room the operation of technological equipment results in an exposure of workers to adverse effects caused by thermal factors. Therefore, the evaluation of thermal conditions in the work area of people was made for the selected industrial boiler room using PMV and PPD indices (which allow to determine the thermal sensation of employees, regarding their surrounding thermal environment, based on the methodology of ISO 7730 standard). The analysis was based on own experimental measurements and numerical calculations made in the DesignBuilder program.

Indoor Three-Dimensional Positioning Method Based on CSS

2014 ◽  
Vol 556-562 ◽  
pp. 3281-3286
Author(s):  
Gao Ping Liu ◽  
Jin Yan Zhang ◽  
Ru Xiang Yang
Keyword(s):  
Kalman Filtering ◽  
Pressure Sensor ◽  
Spread Spectrum ◽  
Indoor Environment ◽  
Three Dimensional ◽  
Chirp Signal ◽  
Positioning Error ◽  
Filtering Method ◽  
Positioning Method ◽  
Chirp Spread Spectrum

This paper designs a three-dimensional positioning scheme suitable for indoor, adopts Chirp Spread Spectrum (CSS) and the particular Symmetric Double-Sided Two-Way Ranging (SDS-TWR). Combining BMP085 pressure sensor to measure altitude, it can implement three-dimensional positioning of a moving object in indoor. Due to the complex indoor environment would cause multipath effect when Chirp signal being transmitted, this scheme uses Kalman filtering method to filter out mutative coordinate value, thus the positioning error can be controlled within 1 m.

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