Time series of autonomous phase-sensitive radar (ApRES) measurements at location EIS8 on Ekström Ice Shelf, Antarctica from April 2020 to January 2021

The dataset consists of raw data from autonomous phase-sensitive radar (ApRES) measurements. The ApRES was operated with two broadband frame antennas at the Ekström Ice Shelf since April 2020 with one measurement every hour. These Lagrangian measurements allow the estimation of basal melt rates based on estimated vertical displacements of englacial and basal reflections. The ApRES is an autonomous operating frequency-modulated continuous wave (FMCW) radar that transmits a tone sweep - called chirp - ranging from 200 to 400 MHz over a period of one second. In order to improve the signal-to-noise ratio, 20 chirps were transmitted within a single measurement. These measurements were repeated every hour. A raw data file contains up to 4 measurements. Background of the pRES-system is published by Nicholls et al. (2015). The processing of the data is described in Zeising et al. (2025).

该数据集包含自主相敏雷达（autonomous phase-sensitive radar，ApRES）测量的原始数据。自2020年4月起，该ApRES在埃克斯特伦冰架（Ekström Ice Shelf）使用两个宽带框架天线运行，每小时进行一次测量。这些拉格朗日（Lagrangian）测量可基于冰内和冰底反射的估计垂直位移来估算冰底融化速率。ApRES是一款自主运行的调频连续波（frequency-modulated continuous wave，FMCW）雷达，它发射一种称为线性调频脉冲（chirp）的音调扫描信号，在1秒内频率范围从200 MHz到400 MHz。为提高信噪比（signal-to-noise ratio），单次测量中会发射20个线性调频脉冲。ApRES系统的背景信息由Nicholls等人（2015）发表，数据处理方法由Zeising等人（2025）描述。