Calibration method of phase distortions for cross polarization channel of instantaneous polarization radar system

In this paper, a Multiple Input Multiple Output (MIMO) radar system based on a sparse-array is proposed. In order to reduce the side-lobe level, a genetic algorithm (GA) is used to optimize the array arrangement. To reduce the complexity of the system, time-division multiplexing (TDM) technology is adopted. Since the signals are received in different periods, a frequency migration will emerge if the target is in motion, which will lead to the lower direction-of-arrival (DOA) performance of the system. To solve this problem, a stretching transformation method in the fast-frequency slow-time domain is proposed, in order to eliminate frequency migration. Only minor adjustments need to be implemented for the signal processing, and the root-mean-square error (RMSE) of the DOA estimation will be reduced by about 90%, compared with the one of an uncalibrated system. For example, a uniform linear array (ULA) MIMO system with 2 transmitters and 20 receivers can be replaced by the proposed system with 2 transmitters and 12 receivers, achieving the same DOA performance. The calibration formulations are given, and the simulation results of the automotive radar system are also provided, which validate the theory.

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A phase error calibration method for distributed VHF radar system

2016 CIE International Conference on Radar (RADAR) ◽

10.1109/radar.2016.8059166 ◽

2016 ◽

Cited By ~ 2

Author(s):

Wei Zhang ◽

Minglei Yang ◽

Baixiao Chen ◽

Yuxi Lin ◽

Jing Wang

Keyword(s):

Phase Error ◽

Calibration Method ◽

Radar System ◽

Vhf Radar ◽

Error Calibration

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Fast Phased Array Calibration by Power-Only Measurements Twice for Each Antenna Element

International Journal of Antennas and Propagation ◽

10.1155/2019/6432149 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10

Author(s):

Guolong He ◽

Xin Gao ◽

Hui Zhou

Keyword(s):

Phased Array ◽

Calibration Method ◽

Point Of View ◽

Antenna Element ◽

Phased Array Antenna ◽

Field Distortion ◽

Array Calibration ◽

Complex Electric Field ◽

Power Measurements ◽

Phase Distortions

This paper proposes a novel power-only measurement method for phased array antenna calibration. Besides the total array power, only one phase shift and two power measurements for each array element are required to determine the element complex electric field distortion, one by shifting the element’s phase of π/2 and the other by turning the element under test off. The theory of the proposed calibration method is given, and the closed form formulation of the element amplitude and phase distortions is derived. From the mathematical point of view, it is the minimum required measurements that use two scalar values to determine one complex vector. Numerical simulations and experiments are conducted to validate and demonstrate the effectiveness of the proposed calibration method.

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METODE KALIBRASI RADAR TRANSPONDER ROKET MENGGUNAKAN DATA GPS (CALIBRATION METHOD OF RADAR TRANSPONDER FOR ROCKET USING GPS DATA)

Jurnal Teknologi Dirgantara ◽

10.30536/j.jtd.2012.v10.a1725 ◽

2012 ◽

Vol 10 (1) ◽

Author(s):

Wahyu Widada

Keyword(s):

Calibration Method ◽

Base Station ◽

Google Earth ◽

Radar System ◽

Calibration Factor ◽

Gps Data ◽

Rocket Launch ◽

Measured Position ◽

Accuracy Result ◽

Data Calibration

This paper discusses the method of calibration of radar transponders for the rocket launch applications using GPS data. Calibration is performed by measuring the distance of two positions with GPS data and used as a reference for the calibration range radar transponder. Transponder is placed on the measured position and the radar transceiver is placed in a position of radar base station. The obtained results shows that the calibration method is very easy to do, reference to a longer distance can improve the accuracy result of the calibration. We obtained a calibration factor value for the radar system used in the experiment is 0.9275.. Keywords: Radar transponder, GPS, Google-earth, Calibration method

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A convenient calibration method of instantaneous polarization radar system

2012 Asia Pacific Microwave Conference Proceedings ◽

10.1109/apmc.2012.6421501 ◽

2012 ◽

Author(s):

Ning Yang ◽

Guo-qiang Zhao ◽

Zhuo Zhang ◽

Hou-jun Sun ◽

Xin Lv

Keyword(s):

Calibration Method ◽

Radar System

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A Calibration Method Based on Fusing Multiple Calibrators for Ultra Wide Band Virtual Aperture Radar System Using Stepped Frequency

JOURNAL OF ELECTRONICS INFORMATION TECHNOLOGY ◽

10.3724/sp.j.1146.2011.00337 ◽

2011 ◽

Vol 33 (11) ◽

pp. 2775-2779 ◽

Cited By ~ 1

Author(s):

Peng-yu Wang ◽

Zhi-min Zhou ◽

Qian Song ◽

Tian Jin

Keyword(s):

Wide Band ◽

Calibration Method ◽

Radar System ◽

Ultra Wide Band ◽

Stepped Frequency ◽

Aperture Radar

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Influence of a Radome on Antenna Performance

Journal of Atmospheric and Oceanic Technology ◽

10.1175/jtech-d-12-00033.1 ◽

2013 ◽

Vol 30 (2) ◽

pp. 313-324 ◽

Cited By ~ 12

Author(s):

Michael Frech ◽

Bertram Lange ◽

Theo Mammen ◽

Joerg Seltmann ◽

Chris Morehead ◽

...

Keyword(s):

Power Level ◽

Radar System ◽

Main Beam ◽

Cross Polarization ◽

Polarization Ratio ◽

Antenna Performance ◽

Radar Systems ◽

Radar Network ◽

Linear Depolarization Ratio

Abstract The German Meteorological Service [Deutscher Wetterdienst (DWD)] operates the German weather radar network and is currently replacing all radar systems with new dual-polarization radars. One of the key components of a radar system is its antenna. The quality of the dual-polarized (dual-pol) moments is dependent on the quality of the antenna and its proper characterization. Dedicated on-site antenna pattern measurements with and without radome are performed in order to verify the antenna and radome specification of the new Hohenpeissenberg radar. Those on-site measurements are carried out from three different source sites in the far field of the antenna. The pattern measurements show that the main antenna specifications, such as the 3-dB beamwidth, beam squint, and sidelobe levels, are met. This is also true if a radome is in place. However, the data suggest that the manufacturer’s specifications are not fulfilled completely. This study finds a substantial increase of the copolar power level off the main beam. The homogeneity of the main beam with respect to differential power and phase is degraded with the radome. The measurements based on the three source sites indicate that a small (but negligible) radome-induced azimuthal variability of the radar moments can be expected. The integrated cross-polarization ratio based on the pattern measurement suggests that 1.4 dB of sensitivity is lost in the linear depolarization ratio (LDR) due to the dry radome.

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