2025 SMSI Bannerklein

1.1 Implementing Tmns Data on Demand

Event
ettc2022 - European Test and Telemetry Conference
2022-05-10 - 2022-05-12
Nuremberg
Chapter
1. Networks & Data Acquisition
Author(s)
R. Docimo, B. Kupferschmidt, K. Rodittis - Curtiss-Wright, Newtown (USA)
Pages
9 - 15
DOI
10.5162/ettc2022/1.1
ISBN
978-3-9819376-6-4
Price
free

Abstract

The Telemetry Network Standard (TmNS) was released as part of the 2017 version of the IRIG-106 standards. Traditionally, serial streaming telemetry data has been sent on a unidirectional link from the test article to the ground. The TmNS standard offers a new approach to acquiring flight test instrumentation (FTI) data that changes this paradigm by allowing the use of bi-directional data links. These bi-directional links allow for commands and requests to come from the ground back to the aircraft. This offers a new capability to the flight test community to request data on demand from the flight test recorder.

One of the longest-standing problems with traditional telemetry has been data dropouts. These gaps in the flight test data can occur at any point in a test flight, and they can prevent the ground controllers from knowing if a test was successfully completed. TmNS offers a solution to this problem by allowing the ground to request a PCM backfill to re-send the section of the data that was lost. This paper explores a fully functional demonstration system that Curtiss-Wright has created to show an end-to-end PCM backfill operation using a TmNS compliant recorder, two TmNS radios, and the IADS real-time visualization and analysis software.

Download