The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

HoustonNet GPS Network - NASA-Space Center Houston P.S.
Start: 13-Mar-2014
End: 17-Jun-2022
Wang, Guoquan, 2015, HoustonNet GPS Network - NASA-Space Center Houston P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5N014TH