Inside GNSS Media & Research

SEP-OCT 2018

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www.insidegnss.com S E P T E M B E R / O C T O B E R 2 0 1 8 Inside GNSS 49 able and it is less meaningful at this stage of the deployment. Let's move on to another Initial Ser- vice figure of merit, the horizontal posi- tioning service availability, computed considering only system contributions from healthy Galileo SIS above a mini- mum elevation of 5 degrees, as a percent- age of time of the average location with a horizontal positioning error less than or equal to 10 meters (95%), both for single and dual frequency users. e position solutions are calculated starting from a minimum of three satellites in view assuming a receiver operating in altitude hold mode, using the previous altitude estimation or approximation available. A similar approach is used for the deri- vation of the HDOP ≤5 availability. Recent analyses ( Figure 9 ) for the month of June 2018 result in a mean HDOP≤5 availability of 92.0% and a mean horizontal positioning ≤10 m availabilit y of 96.4%. For t he same period the mean PDOP≤6 availability is 73.2%. T h e s y s t e m a v a i l a b i l i t y w i l l improve gradually with the inclusion of more operational satellites in the Galileo constellation. As shown in Fig- ure 10 , the evolution of the PDOP≤6 and positioning service availability for FIGURE 9 Horizontal positioning service availability (min: 90.9%, mean: 96.4%, max: 100%, June 2018) 80 60 40 20 0 -20 -40 -60 -80 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Latitude [deg] –150 –100 –50 0 Longitude [deg] (c) Airbus DS 50 100 150 Delivering Aviation Approved GPS Solutions…Worldwide. www.aspennexnav.com Copyright 2017 Aspen Avionics Inc. "Aspen Avionics," "NexNav", "MAX," "Micro-i," and the Aspen Avionics aircraft logo are trademarks of Aspen Avionics Inc. All rights reserved. U.S. Patent No. 8,085,168, and additional patents pending. Approved NexNav ™ GPS solutions for the aerospace industry have a well-proven track record in civil and military, manned and unmanned applications. • GPS-SBAS circuit card assemblies and GPSSUs • Small size, lightweight and low power consumption • Approved for ADS-B OUT position source • Approved for enroute, terminal and approach GPS navigation • Products meet all expected GPS requirements for UAS BVLOS operations • Made in U.S.A. • Go to www.aspennexnav.com for more information Compact Size • Small size, lightweight and low power consumption • Approved for ADS-B OUT position source • Approved for enroute, terminal and approach GPS navigation • Products meet all expected GPS requirements for UAS BVLOS operations

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