DPCA-Based Doppler Radar Measurements from Space: Effect of System Errors on Velocity Estimation Performance

IF 1.9 4区 地球科学 Q2 ENGINEERING, OCEAN Journal of Atmospheric and Oceanic Technology Pub Date : 2023-07-01 DOI:10.1175/jtech-d-22-0048.1
S. Durden, R. Beauchamp, S. Graniello, V. Venkatesh, S. Tanelli
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Abstract

The displaced phased center antenna (DPCA) method of clutter cancellation for ground moving target detection from airborne platforms has been in use for a number of decades. Application of the DPCA method for spaceborne Doppler weather radar velocity estimation was suggested in 2007. The initial description and analysis of the technique was followed several years ago by demonstration using a multiantenna airborne radar. Recent reviews of methods and technology for spaceborne cloud and precipitation radar have also mentioned possible use of DPCA. However, to date, analyses of the application of DPCA to spaceborne Doppler weather radar have assumed that the two channels and antennas are identical, including perfect alignment, and that the DPCA condition is well-satisfied. This study uses simulation to examine the effects of relaxing these assumptions. The simulation method and its validation are discussed, with companion analytical calculations in the appendix. Next, simulations are used to show the effects on the Doppler estimates from errors in pointing and positioning relative to the ideal DPCA. The DPCA technique is relatively robust to possible errors, indicating that a practical DPCA radar system can provide precise Doppler measurements from space. Analytical and simulation results show that the displaced phase center antenna approach can enable spaceborne atmospheric Doppler radar measurements with good accuracy, even in the presence of antenna mispointing and other system errors.
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基于dpca的空间多普勒雷达测量:系统误差对速度估计性能的影响
用于机载平台地面运动目标探测的位移相控中心天线(DPCA)消杂波方法已经应用了几十年。2007年提出了DPCA方法在星载多普勒天气雷达速度估计中的应用。该技术的最初描述和分析是在几年前通过使用多天线机载雷达进行演示。最近对星载云和降水雷达方法和技术的审查也提到了可能使用DPCA。然而,到目前为止,星载多普勒天气雷达中DPCA的应用分析都是假设两个信道和天线完全相同,包括完全对准,并且DPCA条件得到了很好的满足。本研究使用模拟来检验放宽这些假设的影响。本文讨论了仿真方法及其验证,并在附录中给出了相应的分析计算。其次,模拟显示了相对于理想DPCA的指向和定位误差对多普勒估计的影响。DPCA技术对可能出现的误差具有较强的鲁棒性,这表明一个实用的DPCA雷达系统可以从太空提供精确的多普勒测量。分析和仿真结果表明,即使在存在天线指向误差和其他系统误差的情况下,采用移相中心天线方法也能保证星载大气多普勒雷达的测量精度。
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来源期刊
CiteScore
4.50
自引率
9.10%
发文量
135
审稿时长
3 months
期刊介绍: The Journal of Atmospheric and Oceanic Technology (JTECH) publishes research describing instrumentation and methods used in atmospheric and oceanic research, including remote sensing instruments; measurements, validation, and data analysis techniques from satellites, aircraft, balloons, and surface-based platforms; in situ instruments, measurements, and methods for data acquisition, analysis, and interpretation and assimilation in numerical models; and information systems and algorithms.
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