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The HAS service provides free PPP corrections from the Galileo constellation and the Internet,  with targeted real-time\u00a095% positioning performance of better than 20\u00a0cm horizontal and 40\u00a0cm vertical error after 5\u00a0min of convergence time globally and shorter in Europe. The HAS initial service, under validation\u00a0at the time of writing, provides these capabilities with a reduced performance (based on the current Galileo stations network). Live HAS test signals broadcasted from the Galileo satellites during summer 2022 have been decoded and analyzed. Corrections include Galileo and GPS orbit, clock, and code bias corrections, with SISRE of 10.6\u00a0cm and 11.8\u00a0cm for Galileo and GPS, respectively. Code bias corrections showed good performance as well, with rms of 0.28\u00a0ns, 0.26\u00a0ns, and 0.22\u00a0ns for Galileo C1C\u2013C5Q, C1C\u2013C7Q, and C1C\u2013C6C, respectively, and 0.20\u00a0ns for GPS C1C\u2013C2L. Float PPP positioning performance results show that the combined Galileo and GPS solution can already achieve the HAS full service accuracy performance target and is close in terms of convergence time, with 95% rms of 13.1\u00a0cm and 18.6\u00a0cm horizontally and vertically, respectively, in kinematic mode, and with a 95% convergence time of 7.5\u00a0min. The latter is expected to be improved with the inclusion of satellite phase bias and local atmospheric corrections. With these early Galileo HAS test signals, this preliminary analysis indicates that the HAS full service targets are attainable. Finally, a correction latency analysis is performed, showing that even with latency of up to 60\u00a0s, positioning can remain within the targeted HAS accuracy performance.<\/jats:p>","DOI":"10.1007\/s10291-023-01410-y","type":"journal-article","created":{"date-parts":[[2023,2,17]],"date-time":"2023-02-17T02:53:51Z","timestamp":1676602431000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":82,"title":["Assessment of Galileo High Accuracy Service (HAS) test signals and preliminary positioning performance"],"prefix":"10.1007","volume":"27","author":[{"given":"Nacer","family":"Naciri","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ding","family":"Yi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sunil","family":"Bisnath","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F. 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