Efficient and Unambiguous Two-Target Resolution via Subarray-Based Four-Channel Monopulse

In this paper we propose an anlge-of-arrival (AoA) estimation technique using the monopulse signal to achieve a reliable link for the ground-to-unmanned aerial vehicle (UAV) or UAV-to-UAV. We first find the exact statistical characteristics of the monopulse signal, which is the random variable as a form of the ratio between the uncorrelated quadratic random variables with non-zero means. Specifically, we derive the probability density function (PDF) and the cumulative distribution function (CDF) of the monopulse signal in antenna array in closed-form. Then using the statistical characteristics of the monopulse signal, we develop the adaptive AoA estimator which can be applied to fast beamforming with high accuracy. Based on our exact analytical results, we derive the mean square error (MSE) performance of the proposed method. We show from our simulations that the proposed method achieves better performance with relatively less complexity and overhead than other conventional methods.

show abstract

“…In (17) and (18), c is an arbitrary constant. It should be noted that the ideal value for R re is zero, which is shown in (16).…”

Section: A Statistical Modeling Of Monopulse Signalmentioning

confidence: 99%

Angle-of-Arrival Estimation Technique for Fast Beamforming Using Monopulse Signal in the Antenna Array Systems

Song

Nam

2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…The authors in Ref. [18] proposed a subarray‐based four‐channel monopulse method to achieve an efficient and fast two‐target resolution to estimate the angle of same direction targets, but this method requires more antennas. We have proposed a novel closed‐form method that can estimate the angle of two unresolved targets whose signals overlap in both frequencies and time domains using only one pulse for amplitude comparison of monopulse radar, so, it can estimate the direction of rapidly fluctuating targets.…”

Section: Introductionmentioning

confidence: 99%

Closed‐form angle estimation of unresolved targets in monopulse radar to counter the angular electronic attack

Rezaei

Sebt

Zarei

et al. 2023

IET Signal Processing

View full text Add to dashboard Cite

Typical monopulse radar cannot detect the angle of two closely‐spaced targets in one resolution cell. The authors propose a closed‐form technique to estimate the angle of two unresolved targets by using a single snapshot of four radar receiver channels. In this work, phase comparison and amplitude comparison problems for monopulse radar are resolved. The monopulse radar angle estimation system has been enhanced using the diagonal difference channel. Using a single pulse, this technique can accurately determine the angle and amplitude of the deceptive decoy and the real target. If both targets have the same direction, the proposed scheme cannot detect them; therefore, to estimate the angle of such targets, we used an additional antenna. The effectiveness of the proposed method is validated by comparing the exact solutions and simulations.

show abstract

“…Jardak used an additional set of four antennas to estimate the ambiguous angles of the two unresolved targets that have identical azimuth or elevation angles in [3]. Ulteriorly, Wang proposed a subarray‐based four‐channel monopulse method in [4], which can apply to the radar of elliptical antenna array configuration by an initial estimation with the inscribed rectangular array.…”

Section: Introductionmentioning

confidence: 99%

Algorithm supplement of four‐channel two‐target resolution for amplitude‐comparison monopulse radar

Wang

Shi

2021

Electronics Letters

View full text Add to dashboard Cite

The traditional four-channel monopulse two-target resolution algorithm can only apply to phase-comparison monopulse radars with four parallel beams and is not suitable for amplitude-comparison monopulse radars with four squint beams. For this case, a supplementary algorithm is proposed here. By a novel matrix transform processing, virtual phase-comparison monopulse signals are generated from the received amplitude-comparison monopulse signals and the angles of the targets can be estimated by the traditional four-channel monopulse resolution algorithm. Moreover, by restructuring the amplitude-comparison monopulse signals of the two targets from the estimation results, the estimation bias caused by the monopulse curves inconsistency of the phase-comparison antenna and the amplitude-comparison antenna is eliminated as well. Simulations validate the effectiveness of the algorithm.

show abstract

Efficient and Unambiguous Two-Target Resolution via Subarray-Based Four-Channel Monopulse

Cited by 10 publications

References 25 publications

Angle-of-Arrival Estimation Technique for Fast Beamforming Using Monopulse Signal in the Antenna Array Systems

Angle-of-Arrival Estimation Technique for Fast Beamforming Using Monopulse Signal in the Antenna Array Systems

Closed‐form angle estimation of unresolved targets in monopulse radar to counter the angular electronic attack

Algorithm supplement of four‐channel two‐target resolution for amplitude‐comparison monopulse radar

Contact Info

Product

Resources

About