Airborne polarimetric Doppler weather radar: trade-offs between various engineering specifications

Author:

Vivekanandan JothiramORCID,Loew Eric

Abstract

Abstract. NCAR EOL is investigating potential configurations for the next-generation airborne phased array radar (APAR) that is capable of retrieving dynamic and microphysical characteristics of clouds and precipitation. The APAR will operate at C band. The APAR will use the electronic scanning (e-scan) feature to acquire the optimal number of independent samples for recording research-quality measurements. Since the airborne radar has only a limited time for collecting measurements over a specified region (moving aircraft platform ∼ 100 m s−1), beam multiplexing will significantly enhance its ability to collect high-resolution, research-quality measurements. Beam multiplexing reduces errors in radar measurements while providing rapid updates of scan volumes. Beamwidth depends on the size of the antenna aperture. Beamwidth and directivity of elliptical, circular, and rectangular antenna apertures are compared and radar sensitivity is evaluated for various polarimetric configurations and transmit–receive (T/R) elements. In the case of polarimetric measurements, alternate transmit with alternate receive (single-channel receiver) and simultaneous reception (dual-channel receiver) is compared. From an overall architecture perspective, element-level digitization of T/R module versus digital sub-array is considered with regard to flexibility in adaptive beamforming, polarimetric performance, calibration, and data quality. Methodologies for calibration of the radar and removing bias in polarimetric measurements are outlined. The above-mentioned engineering options are evaluated for realizing an optimal APAR system suitable for measuring the high temporal and spatial resolutions of Doppler and polarimetric measurements of precipitation and clouds.

Funder

Directorate for Geosciences

Publisher

Copernicus GmbH

Subject

Atmospheric Science,Geology,Oceanography

Cited by 8 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Estimating Polarization Purity With Noise;IEEE Transactions on Geoscience and Remote Sensing;2024

2. Airborne Polarimetric Doppler Phased Array Weather Radar: Digital Twin of the Active Electronically Scanned Array;2022 IEEE International Symposium on Phased Array Systems & Technology (PAST);2022-10-11

3. Two-Way Pattern Synthesis for the Airborne Phased Array Radar (APAR);2022 IEEE International Symposium on Phased Array Systems & Technology (PAST);2022-10-11

4. Enabling efficient execution of a variational data assimilation application;The International Journal of High Performance Computing Applications;2022-08-28

5. Calibration and Weather Observation of a Dual-polarized Phased Array Line Replaceable Unit Radar Demonstrator;2020 IEEE Radar Conference (RadarConf20);2020-09-21

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