Experimental study on multi-channel waveform agile beamforming and testbed calibration

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In this paper, a novel multi-channel waveform agile radar testbed - ASTAP (Advanced Space-Time Adaptive Processing) with eight transmit channels and a single receive channel to form a co-located Multiple-Input Single-Output (MISO) radar is presented. Based on current configuration, the ASTAP radar system possesses agility for synthesizing and transmitting independent waveforms via each transmit channel simultaneously via multi-channel Arbitrary Waveform Generator (AWG). Hardware imperfections influence on digitally created waveforms including limited-bits DAC (Digital-to-Analog Converter) quantization, inter-channel time- and phase-skew (and/or jitter), non-linearities introduced by high-frequency devices (RF amplifiers and mixers etc) and antenna dispersion effects has been studied experimentally.An end-to-end system-level digital calibration using Over-the-Air (OTA) channel measurements to minimize system hardware imperfections prior to transmission is proposed. Calibration accuracy for waveform transmit ambiguity functions, orthogonality in MISO transmissions, received signals separation and beamforming process for the synthesis of target azimuth distributions is examined and quantified. Front-end performance with different waveforms types for colored transmission and simultaneous MIMO is demonstrated and analysed. Extraction of the signals corresponding to each transmit channel from the composite received signal in a single receive channel exploiting waveforms orthogonality is studied experimentally.
Original languageEnglish
Title of host publication2021 IEEE Conference on Antenna Measurements & Applications (CAMA)
Subtitle of host publicationProceedings
Number of pages6
ISBN (Electronic)978-1-7281-9697-8
ISBN (Print)978-1-7281-9698-5
Publication statusPublished - 2021
Event2021 IEEE Conference on Antenna Measurements & Applications (CAMA) - Antibes Juan-les-Pins, France
Duration: 15 Nov 202117 Nov 2021


Conference2021 IEEE Conference on Antenna Measurements & Applications (CAMA)
CityAntibes Juan-les-Pins,

Bibliographical note

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Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Coded waveforms
  • front-end calibration
  • multi-channel radar demonstrator
  • MISO transmissions
  • multibeam processing
  • multi-channel front-end
  • OTA measurement calibration
  • waveform agility


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