W-band High Range Resolution Altimeter White paper by Ali Dagdeviren

W-band High Range Resolution Altimeter Developments in Arralis by Ali Dagdeviren

Our Engineering Team Leader Ali Dagdeviren will be presenting his paper ‘W-band High Range Resolution Altimeter Developments in Arralis’ at this year’s ARMMS conference which is taking place on the 7th and 8th of November in Wyboston. Ali’s paper summarizes his work to create a W-band FMCW Radar which maximises the range resolution capability of a rotary aircraft altimeter to detect obstacles when landing in poor visibility. You can access the full paper below the abstract.


The range resolution capability of the aircraft altimeter is one of the key parameters during precise height measurements. During the landing of a rotary-wing aircraft, it is vital to detect obstacles such as power cables, especially in poor visibility conditions like snow (White-out) and dust clouds (Brown-out) to assist a safe landing.

For lower height measurements, Frequency Modulated Continuous Wave (FMCW) radars are used to achieve a better resolution with the aid of higher bandwidth. However, this comes with two challenges: (1) the design complexity of the Radio Frequency Integrated Circuit (RFIC), (2) the high rate of atmospheric attenuation caused by the gases and aerosols.

Using the frequencies in the neighbourhood of 94 GHz for the transmission significantly reduces the atmospheric attenuation and provides an atmospheric transparency window.

In this paper, the W-band FMCW altimeter radar developed by Arralis is described. Arralis comes with the solution of both integrated circuits and modules used in a transmitter/receiver chain designed for W-band. This provides a complete FMCW radar system working in the frequency range of 92-96 GHz with the aid of commercial off the shelf analogue to digital converters and Digital Signal Processing (DSP) evaluation boards. Thus, by achieving a 4 GHz bandwidth at the centre of 94 GHz, a theoretical range resolution of 3.75 cm is achieved, which is then degraded by the windowing function factor during converting the signal into the frequency domain. The FMCW radar system uses a triangular waveform by default, which then can be converted to other waveforms as well.

Click here to download the white paper


Interested in our FMCW Radar or applications of W-band Technology?

Contact Arralis today at sales@reliasat.com or visit https://reliasat.com/w-band-products/ for our W-band product datasheets.