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NexNav mini GPS SBAS sensor units include part numbers 21000 and 21001. The NexNav mini GPS SBAS is a satellite sensor that utilizes the signals coming from the Global Positioning System (GPS) satellite constellation and satellite-based augmentation systems (SBAS). Wide Area Augmentation System (WAAS) is one example of SBAS. It also supports EGNOS, MSAS and GAGAN to the extent that they are compatible with WAAS.
They are GPS sensor units designed to meet the requirements of US FAA TSO C145c and intended for installation on board civil aircraft. Their primary function is to provide aircraft position, aircraft velocity and precise time.
Part numbers 21000 and 21001 share a common mechanical enclosure. Both have a TNC-type antenna connector and a 25 pin D-type connector for all other input/output. Part number 21000 supports the RS-232 based NexNav Binary and NMEA 0183 interface protocols. Part number 21001 supports the RS-232-based Accord Binary and NMEA 0183 interface protocols. Both are authorized US FAA TSO C145C, WAAS Class Beta 1. All NexNav mini sensor units meet the requirements of US FAA Advisory Circular 20-165B for ADS-B GPS source.
1f The NexNav Micro-i GPS SBAS is a satellite receiver that utilizes the signals coming from Global Positioning System (GPS) satellite constellation and satellite-based augmentation system (SBAS). Wide Area Augmentation System (WAAS) is one example of SBAS. It also supports EGNOS, MSAS and GAGAN to the extent that they are compatible with WAAS.
NexNav Micro-i GPS products, modules and GPS sensor units, have been designed to meet the requirements of both TSO C199, Appendix 1, Section A1.2.6 for TABS and the position source performance requirements of 14 CFR §91.227(c) for ADS-B OUT. Accordingly, the currently targeted applications for the NexNav Micro-i GPS products include aircraft exempted from carrying a transponder or ADS-B equipment (such as gliders, balloons and aircraft without electrical systems) optionally equipped with TABS and experimental aircraft requiring a 14 CFR §91.227 compliant ADS-B OUT position source. Depending on how the regulatory and policy situation evolves, potential future applications for NexNav Micro-i GPS products could include use as a 14 CFR §91.227 compliant ADS-B OUT position source on UAS platforms and on Part 23, Class I & II TC’ed aircraft.
The primary function of Micro-i is to compute the position, velocity of an aircraft and the precise time (PVT) and provide the output to the host system, such as a transponder. It also computes the integrity of the PVT from the SBAS signal, if available. Micro-i detects the failed satellites (FD) using receiver autonomous integrity monitoring (RAIM) algorithm, whenever there are enough number of satellites to support the FD.