The LRA-2100 is Rockwell Collins first digital radio altimeter allowing increased precision while transmitting less power and consuming a fraction of the power of traditional radio altimeters. This is made possible through the use of the latest digital technology - specifically dual independent digital signal processors (DSP).

Using DSP technology, the LRA-2100s altitude algorithm can compute the fast fourier transform (FFT) spectral analysis of the signal returned from the terrain below. The spectral analysis algorithm used within the LRA-2100 provides the ability to discriminate terrain within the spectrum. This new capability allows for enhanced altitude reporting such as multi-target adaptation for fewer auto-pilot disconnects, bright spot rejection, and rejection of under-flying aircraft. Another feature of this technology is significantly improved performance over runway approach structures. Utilizing independent dual DSP technology it allows for tight cross comparison of the data to ensure integrity and safety.

The LRA-2100 benefits from moving from analog to digital technology by using minimal analog circuitry and a lower overall component count, which increases the overall reliability of the system. The 40% lower power consumption allows the LRA-2100 to not require forced air cooling and reduces the total weight by an incredible 25% of similar radio altimeters.

The LRA-2100 outputs a maximum of 26.5dBm (0.5W). A direct digital synthesizer (DDS) used within the RF transmitter to control the FM/CW is attributed to the increased altitude accuracy and lower RF power output.

The LRA-2100 is used to provide extremely high altitude accuracy above terrain to the pilot during approach and landing phases of flight. Accurate altitude information during approach and landing phases is crucial to autopilot and auto-landing systems, such as the Automatic Flight Control System (AFCS), that require high integrity accurate altitude information. The data is also a critical input to the Terrain Awareness and Warning System.