A Novel Schematic for Calibration of Large Phased Array Antenna Using Programmable Time-Delay Units

Alfred, Quazi Mohmmad; Chakravarty, Tapas; Sanyal, Sugata

doi:10.2528/pier06080301

Cited by 13 publications

(8 citation statements)

References 3 publications

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“…It is envisaged that instead of making an attempt to identify and quantify such errors, it is better to periodically calibrate the phased array. Such a calibration technique is discussed by the authors in [7]. The required phase offsets can be introduced in the system after the signal is received to account for random errors in hardware.…”

Section: Discussionmentioning

confidence: 99%

“…1. The beam forming (steering) matrix shown here is a true time delay (delay line) based switching matrix and is controlled by a 16 bit microcontroller was shown earlier by the authors [1,6,7]. Antenna elements in the subarray are properly loaded with time delay units so that equivalent phase tapering is obtained to steer the beam in a desired direction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

Alfred

Chakravarty

Singh

et al. 2008

Int J Infrared Milli Waves

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In this article, a simple and efficient technique for the wideband shaped beam and sector beam pattern generation with their adaptive interference rejection is proposed. A microcontroller controlled and time delay based beam forming network for simultaneously generating multiple beams, shaped beam and sector beam is conceptualized. The antenna patterns considered here is formed by linear array of isotropic elements grouped as subarray. The shaped and sector beam synthesis procedure is practically simplified by simultaneous adding the constituents beams from the subarrays, was theoretically established by Woodward and Lawson (Proc. IEE. 95(1): [362][363][364][365][366][367][368][369][370] 1948). Apart from the shaped beam generation a technique for adaptive interference rejection in shaped patterns using combination of time delay and phase shifter is discussed. This topic promises good prospect for wideband pattern generation and interference rejection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

Alfred

Chakravarty

Singh

et al. 2008

Int J Infrared Milli Waves

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show abstract

“…(6) allows keeping the same phase relations between its components. So, the time shifts in our calibration technique do not influence the radiation pattern, contrary to the approach in [15], where time delays are also used for phased array calibration. The relative time offset is equal to the width of a compressed signal s(t), that is to the width of the peak of its auto-correlation function ACF s .…”

Section: Descriptionmentioning

confidence: 93%

Simple Calibration Technique for Phased Array Radar Systems

Babur¹,

Manokhin²,

Monastyrev³

et al. 2017

PIER M

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Abstract-This paper presents a novel effective calibration technique applicable to phased array radars. The real embedded patterns of the array elements are measured independently in operating mode, taking antenna coupling and other parasitic effects into account. The proposed calibration technique requires minimal modification of the radar hardware. A set of angular-dependent error coefficients, which are compensated during the calibration process, are extracted for one received pulse for one/each angular direction of interest. The performance and effectiveness of the here-proposed calibration technique are assessed by means of modeling and experimental verification.

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“…Therefore, calibration of large phased arrays is required to off-set the beam-pointing errors. In an interesting approach to far-field measurements and calibration of very large sized array antenna, radio source has been used [9,10]. The noise temperature of the radio source Virgo-A (3C 274) was measured in the receive mode during its transit over the radar.…”

Section: Calibration Techniquesmentioning

confidence: 99%

A Programmable Phased Array with Time-Delay Units and its Applications

Alfred

Chopra

Chakravarty

et al. 2009

Int J Wireless Inf Networks

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In this paper, a phased array antenna schematic using true time delays is proposed and suitable time-delays are inserted by switching ON/OFF the RF switches. Using this concept, one can generate SUM pattern, DIFFER-ENCE pattern, as well as a combination of these two. It is shown that SUM-DIFFERENCE pattern has interesting applications in radar, namely, calibration of beam pointing accuracy and blind speed elimination in a delay line cancellation method. The proposed method can also be formatted to requirements of conical scan as well as shaped beam generation. The proposed method is validated using existing knowledge.

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A Novel Schematic for Calibration of Large Phased Array Antenna Using Programmable Time-Delay Units

Cited by 13 publications

References 3 publications

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

Simple Calibration Technique for Phased Array Radar Systems

A Programmable Phased Array with Time-Delay Units and its Applications

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