ALT-9000 Radio Altimeter Test Set

April 27, 2022

As manufacturers release  radio altimeter (RADALTs) with more sophisticated waveforms to address safety and security issues in the aviation industry, the ALT-9000 universal RADALT flight line test set adds fiber optic delay to traditional radio frequency (RF) testing, enabling it to test all types of RADALTS on the market today.

The RADALT measures an aircraft's altitude above the terrain, by transmitting a radio frequency (RF) signal down to the ground and receiving a reflection. To prevent potential spoofing or jamming of the return signal, modern RADALTs use more complex waveforms, and the U.S. military has transitioned a majority of its aircraft to these models. Also, as 5G networks begin to use C-band frequencies, older RADALTs may lack the required interference protection. These trends call for updated testing technology and procedures to address legacy and new RADALT types, and to enable rapid retesting to identify issues that can disrupt flight operations.

The VIAVI ALT-9000 is a portable test set that utilizes fiber-optic delay to allow it to work with all types of radio altimeters. It tests the complete RADALT system, allowing the operator to isolate a problem to the antenna, coaxial cable, line-replaceable unit (LRU) or indicator, eliminating unnecessary swaps or replacements of system components. The ALT-9000 performs complete closed-loop system tests, replicates in-flight conditions, and creates profiles for dynamic altitude simulations. The comprehensive, efficient and user-friendly test process enables more frequent testing of flight systems, reducing the cost of takeoff failures.

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