JOHN AGGREY

 

John graduated with a Master’s degree (MSc) from York University after his Bachelor of Science degree in Geomatics Engineering from Kwame Nkrumah University of Science and Technology, Ghana. He made it a point to gain work experience after school, in various engineering positions.

His research interests and work include the enhancement and development of positioning filtering, functional models, stochastic models, and prediction models of GNSS data processing. He is a crucial part of the Precise Point Positioning Team and has been investigating various low-cost receivers, both geodetic and smartphones to analyse their positioning accuracy. 

When he is not behind his 5-monitor computer station setup working, he is busy behind his laptop on Steam video games saving the world and being awesome at it. He loves the arts and is a fine artist himself as well as a poet and story writer. If 5k foam fests are considered as sports, John boasts of 2 medals and has an enviable record in go-carting.

He can be contacted on :

Linkedln: https://ca.linkedin.com/in/john-egyir-aggrey-82218b18

Publications

  Journal Papers and Articles

  1. Vana, Sudha, Aggrey, John, Bisnath, Sunil, Leandro, Rodrigo, Urquhart, Landon, Gonzalez, Paola, "Analysis of GNSS Correction Data Standards for the Automotive Market," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 4197-4214.
  2. S. Vana, J. Aggrey, S. Bisnath, R. Leandro, L. Urquhart, P. Gonzalez, "Analysis of GNSS Correction Data Standards for the Automotive Market," Navigation: Journal of The Institute of Navigation, In Press. (Accepted for publishing)
  3. Aggrey, J, Bisnath, S, Naciri, N, Shinghal, G, Yang, S. “Multi-GNSS Precise Point Positioning with next-generation smartphone measurements”. 2019. Journal of Spatial Science. Publication is under review for publication.
  4. Aggrey, J.; Bisnath, S. Improving GNSS PPP Convergence: The Case of Atmospheric-Constrained, Multi-GNSS PPP-AR. Sensors 2019, 19, 587.
  5. Bisnath S, Aggrey J, Seepersad G, Gill M. “Examining precise point positioning now and in the future: Where Are We Now, and Where Are We Going?”, GPS World, March 2018,  https://www.gpsworld.com/innovation-examining-precise-point-positioning-now-and-in-the-future/
  6. Aggrey, J, Bisnath, S, "Dependence of GLONASS Pseudorange Inter-frequency Bias on Receiver-Antenna Combination and Impact on Precise Point Positioning", NAVIGATION, Journal of The Institute of Navigation, Vol. 63, No. 4, Winter 2016, pp. 377-389.

 

Conference Proceeding Papers

  1. Aggrey, J, Bisnath, S, Naciri, N, Shinghal, G, Yang, S, " Use of PPP processing for next-generation smartphone GNSS chips: Key benefits and challenges" Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019. Publication is under review for publication.
  2. Aggrey, J, Bisnath, S, Naciri, N, Shinghal, G, Yang, S, " Accuracy trend analysis of low-cost GNSS chips: The case of multi-constellation GNSS PPP". Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019. Publication is under review for publication.
  3. Aggrey, John, "Assessment of Global and Regional Ionospheric Corrections in Multi-GNSS PPP," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 3967-3981. https://doi.org/10.33012/2018.16079. Winner of best student paper award.
  4. Vana, Sudha, Aggrey, John, Bisnath, Sunil, Leandro, Rodrigo, Urquhart, Landon, Gonzalez, Paola, "Analysis of GNSS Correction Data Standards for the Automotive Market" Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 4197-4214.                https://doi.org/10.33012/2018.16081
  5. Gill, Maninder, Bisnath, Sunil, Aggrey, John, Seepersad, Garrett, "Precise Point Positioning (PPP) using Low-Cost and Ultra-Low-Cost GNSS Receivers" Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 226-236.
  6. Aggrey, John, Seepersad, Garrett, Bisnath, Sunil, "Performance Analysis of Atmospheric Constrained Uncombined Multi-GNSS PPP" Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 2191-2203.
  7. Seepersad, G., Aggrey, J., Bisnath, S., "Do We Need Ambiguity Resolution in Multi-GNSS PPP for Accuracy or Integrity?" Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 2204-2218.
  8. Aggrey, J, Bisnath, S, "Analysis of Multi-GNSS PPP Initialization using Dual- and Triple-frequency Data," Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2017, pp. 445-458.
  9. Seepersad, G., Aggrey, J., Gill, M., Bisnath, S., Kim, D., Tang, H., (2015) "Relative Positioning Using RTK Measurement Filtering and PPP," Proceedings of the 28th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2015), Tampa, FL, September 2015, pp. 2537-2547.
  10. Aggrey J, Bisnath S (2014) Analysis and modelling of pseudorange and carrier-phase biases in GNSS Precise Point Positioning. In: Proceedings of the 27th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2014). Tampa Convention Center Tampa, Florida, pp 2512–2522

Presentations

  1. Aggrey, John, "Assessment of Global and Regional Ionospheric Corrections in Multi-GNSS PPP," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 3967-3981.
  2. Aggrey, John, Seepersad, Garrett, Bisnath, Sunil, "Performance Analysis of Atmospheric Constrained Uncombined Multi-GNSS PPP" Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 2191-2203.
  3. Seepersad, G., Aggrey, J., Bisnath, S., "Do We Need Ambiguity Resolution in Multi-GNSS PPP for Accuracy or Integrity?" Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 2204-2218.
  4. Aggrey, J, Bisnath, S (2017), "Multi-GNSS Precise Point Positioning Software Architecture and Analysis of GNSS Equipment Biases," Research Evaluation Course, [Presentation], May 15, 2017, York University, Toronto, Canada.
  5. Aggrey, J, Bisnath, S (2017), "Analysis of Multi-GNSS PPP Initialization using Dual- and Triple-frequency Data," Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, [Presentation], Monterey, California, January 2017, pp. 445-458.
  6. Aggrey J, Bisnath S (2016) "Multi-GNSS Precise Point Positioning Software Architecture and Analysis of GNSS Equipment Biases" Research Evaluation Course [Presentation], 2nd Prize Winner, York University, Toronto, Canada.
  7. Seepersad, G., Aggrey, J., Gill, M., Bisnath, S., Kim, D., Tang, H., (2015) "Relative Positioning Using RTK Measurement Filtering and PPP," Proceedings of the 28th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2015), [Presentation], Tampa, FL, September 2015, pp. 2537-2547.
  8. Aggrey J (2015) "Analysis of the spectral characteristics of PPP error sources" York University ESSE 5020 (Time Series) graduate project [Presentation], York University, Toronto, Canada.
  9. Aggrey J, Bisnath S (2015) "Multi-GNSS Precise Point Positioning Software Architecture and Analysis of GNSS Equipment Biases" Research Evaluation Course [Presentation], York University, Toronto, Canada.
  10. Aggrey J, Bisnath S (2014, " Analysis and modelling of pseudorange and carrier-phase biases in GNSS Precise Point Positioning". In: Proceedings of the 27th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2014). [Presentation], Tampa Convention Center Tampa, Florida, pp 2512–2522.
  11. Aggrey J, Bisnath S (2014) "Multi-GNSS Precise Point Positioning Software Architecture and Analysis of GNSS Equipment Biases" Research Evaluation Course [Presentation], York University, Toronto, Canada.
  12.  Aggrey J, Bisnath S (2014), " Analysis and modelling of pseudorange and carrier-phase biases in GNSS Precise Point Positioning" In: Proceedings of the 27th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2014). [Presentation], Tampa Convention Center Tampa, Florida, pp 2512–2522.
  13. Aggrey J, Bisnath S (2014) "Multi-GNSS Precise Point Positioning Software Architecture and Analysis of GNSS Equipment Biases" Research Evaluation Course [Presentation], York University, Toronto, Canada.
  14. Aggrey J, Bisnath S (2013) "Development of a Multi-GNSS Precise point Positioning Processor" Research Evaluation Course [Presentation], York University, Toronto, Canada.
  15. Aggrey J, Layer T, Girin I (2012) "Real-time data processing comparison using Least squares, Extended Kalman filter and Sequential Least Squares filters" York University ESSE 5430 (Advanced Satellite Positioning) graduate project [Presentation], York University, Toronto, Canada.
  16. Aggrey J, Bisnath S (2012) "Development of a Multi-GNSS Precise point Positioning Processor" Research Evaluation Course [Presentation], York University, Toronto, Canada.

 

   Posters

  1. Aggrey J, Bisnath S, (2019) " Improving Multi-GNSS PPP convergence" Association of Ontario Land Surveyors [Poster], Third Prize Winner, February 27 - March 1, 2019, Westin Harbour Castle, Toronto, Ontario Ontario, Canada.
  2. Aggrey J, Bisnath S, (2018) "Ionospheric constrained Multi-GNSS PPP: Towards RTK-like performance" Association of Ontario Land Surveyors [Poster], Fourth Prize Winner, February 28 - March 2, 2018, Niagara Falls, Ontario, Canada.
  3. Aggrey J, Bisnath S, (2017) "From Dual- to Triple-Frequency Multi-GNSS PPP: Benefits and Challenges" Association of Ontario Land Surveyors [Poster], First Prize Winner, March 1 - 3, 2017, Shaw Centre, Ottawa, Canada.

 

Thesis

  1. Aggrey J (2015) "Multi-GNSS Precise Point Positioning Software Architecture and Analysis of GLONASS pseudorange biases". MSc. Thesis, York University, Toronto, Ontario, Canada, 137 p.
  2. Aggrey J, Tetteh L K (2010) "Optimal Location and Network Capacity of Mobile Telecommunication Cellular Towers - A Review of Licensed Network Operators In Ashanti Region of Ghana". BSc. Thesis, Kwame Nkrumah university of Science and Technology, Kumasi, Ghana, 53 p.

 

 

 

 

 

 

 

 

 

 

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