Ericsson Careers

Master Thesis - GNSS timing & positioning

Stockholm, Sweden
Students and Young Professionals

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English (US)

Job Description

Date: Nov 22, 2018

Master Thesis - GNSS timing receiver performance in urban canyons

 

Background

GNSS (Global Network Satellite System) timing receivers are used to provide accurate time, better than 50ns to Radio Base Station (RBS) in ERS (Ericsson Radio System). Many 5G Street Macro RBS using GNSS receiver will be installed on street level in city centers. This is called urban canyons as the sky visibility from their GNSS antenna will be very limited. The visible GNSS satellites in such areas represents often bad DOP (Dilution of Precision), i.e. bad position accuracy from triangulation viewpoint impacting time accuracy. Surrounding tall buildings will additionally cause multi-path signals due to reflexes.

 

Thesis Description

The study shall identify how the GNSS timing receiver accuracy, 1PPS (one pulse per second), is impacted by usage in urban canyons. Theory to be collected by literature research. Test setup to be defined. Time accuracy performance to be measured by placing the GNSS antenna in realistic positions in locations representing urban canyons. The study shall as conclusion provide guidance on where the GNSS antenna can be placed in urban canyons.

 

The following steps are envisioned as part of the thesis work:

Investigate how the 1PPS accuracy and stability depends on GNSS antenna placement in urban canyons. Theory to be collected by literature research and other open sources.

 

Implement a test setup and test achieved performance in challenging realistic conditions.

 

Analyze the results from theory, practical tests and propose guidelines.

 

The thesis will be concluded with a result presentation for Ericsson

 

Requirements/ key qualifications:

This project aims at students in MS computer engineering, computer science, electrical engineering or similar.

The successful candidate must have

·         Excellent grades

 

·         Fluent in English, both written and spoken

 

·         Good communications skills

 

·         Self-motivated and positive person

 

Location

Ericsson AB Kista, Stockholm

 

Preferred Starting Date: Spring-Summer 2019

While applying please attach your updated CV, current grades and cover letter written in English into one document (under CV field in the application tool) and clearly define your technical knowledge.

We encourage you to bring your own ideas to the topic above and we look forward to hearing them.

 

If you have any questions, please reach out to the person below:

Akbar Yassarati

akbar.yassarati@ericsson.com

 

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Primary country and city: Sweden (SE) || || Stockholm || Stud&YP

Job details: Developer