Calibration and diagnostics of the THAAD solid state phased array in a planar nearfield facility

Mulcahey, J.K.; Sarcione, M.

doi:10.1109/past.1996.566108

Cited by 13 publications

(9 citation statements)

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“…It is often performed under controlled conditions of temperature and humidity inside of an anechoic chamber [9]. An example of this is the widely known park and probe technique [10], [11], that employs a robotic scanner. Other examples that require external equipment are [12]- [15].…”

Section: While the Conventional Methods In An Anechoic Chambermentioning

confidence: 99%

“…The park and probe technique has been traditionally used to estimate the phase and amplitude errors among all antenna elements of a phased array system [10]. The procedure is straight forward, it employs a robotic manipulator to position an external antenna probe at a distance d of the nth active element, and then proceeds to test it.…”

Section: A Park and Probementioning

confidence: 99%

“…The column matrix that contains the unknown error terms is denominated K. Lastly, the column matrix on the right side is R, and it is composed of the measured coupling values R n,m . Consequently, (10) and (11) have the following form:…”

Section: B Mutual Coupling-basedmentioning

confidence: 99%

“…In this way, (5) and 7are simplified to K r n = k r n and K t n = k t n . As a consequence, by calculating the k r n and k t n terms from (10) and 11, the unknown K r n and K t n ratios are also obtained. Moreover, (14) also results in…”

Section: B Mutual Coupling-basedmentioning

confidence: 99%

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Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

et al. 2020

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This paper presents experimental results of an initial and in-situ mutual coupling calibration techniques of an active phased array antenna. The antenna is a dual-polarized 64-element C-band subarray panel equipped with an RF beamformer that enables mutual coupling measurements. Both techniques were implemented, tested and validated using a custom anechoic chamber and a radar backend. The implementation of a radar backend enables the in-situ validation of both methods. A conventional near-field calibration procedure, also known as park and probe, was used as a reference, in order to validate the proposed method. To quantify the calibration effectiveness of the mutual coupling-based techniques, the results are translated into phase and amplitude errors. It is found that the amplitude estimation of the tested initial technique is affected by edge effects, resulting in errors larger than 1 dB, whereas the phase estimation is less sensitive, yielding an overall root mean square error (RMSE) of 2.5 •. In contrast, the proposed in-situ technique is not affected by edge effects, and its estimation RMSE is less than 0.12 dB in amplitude and less than 0.75 • in phase. Mutual coupling-based calibration techniques are demonstrated to be very versatile, as they provide calibration methods for environments outside an anechoic chamber, and they also enable immediate feedback on the health of the system. INDEX TERMS Active phased array, calibration, component failure, mutual coupling, park and probe.

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Section: While the Conventional Methods In An Anechoic Chambermentioning

confidence: 99%

Section: A Park and Probementioning

confidence: 99%

Section: B Mutual Coupling-basedmentioning

confidence: 99%

Section: B Mutual Coupling-basedmentioning

confidence: 99%

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Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

et al. 2020

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“…When fully implemented, MPAR will employ between 7 and 20 million transmit/receive (T/R) modules requiring over 100 million Monolithic Microwave Integrated Circuits (MMICs) and will be the largest phased array program ever fielded with production volumes typical of consumer applications. The calibration of phased array radar systems has been an important area of discussion over the last several years [1][2][3][4][5], and Section II presents a technical approach for the calibration of a subarray that uses two S-band panels. Each panel of 8 × 8 elements is currently under development at MIT Lincoln Laboratory [6,7].…”

Section: Introductionmentioning

confidence: 99%

A method for improved cross-pol isolation based on the use of auxilliary elements

Yeary

Conway

Herd

et al. 2013

2013 IEEE International Symposium on Phased Array Systems and Technology

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This paper describes a method to answer the following questions: can several of the elements of a phased array be employed as auxiliary (AUX) elements and how can the phase of each be adjusted so that the (1) cross-polarization (cross-pol) isolation is minimized to 40 dB, (2) the sidelobe levels of the main lobe are minimally impacted, and (3) the width and height of the main lobe are minimally impacted? This calibration work is being completed as one component of Lincoln Laboratory's effort within the multifunction phased array radar (MPAR) initiative. Devoting a few of the elements to serve as the AUX channels to specifically operate to mitigate the effects of the cross-pol influence, the distributed sidelobe levels will not suffer much impact; yet, the impact of the AUX elements will have deepened the cross-pol isolation at the peak of the co-polar beam can occur because the AUX elements can achieve a high degree of narrowband angular resolution.

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Array Excitation Error Calibration

He,

Gao,

Zhang

et al. 2023

Modern Antenna

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Calibration and diagnostics of the THAAD solid state phased array in a planar nearfield facility

Cited by 13 publications

References 0 publications

Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

A method for improved cross-pol isolation based on the use of auxilliary elements

Array Excitation Error Calibration

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