Hybrid Phased MIMO Radar With Unequal Subarrays

Khan, Wasim; Qureshi, Ijaz Mansoor; Basit, Abdul; Zubair, Muhammad

doi:10.1109/lawp.2015.2419279

Cited by 28 publications

(35 citation statements)

References 11 publications

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“…It should be noted that the number of subarray antennas must be confirmed and applied in relation (1). In scenarios 2 to 4, desired pattern is normalized based on (14), and consequently, the constraint of total power is applied to all cases. Optimization, as a default, is done 10 times.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Unequal subarrays have been investigated in Anastasios et al One of the waveforms of s ( t ) = [ s 1 ( t ) ⋯ s K ( t )] T is assigned to each subarray, which satisfies the orthogonality condition as

\int_{T_{0}} bold-italics ((), t) s^{H} ((), t) italicdt = I_{K,}

…”

Section: System Modelmentioning

confidence: 99%

“…As noted earlier, the total power is equal to tr(R). If the desired beam pattern is selected so that the relation (14) can be satisfied, as the designed beam pattern convergence toward desired beam pattern, its corresponding total power converges toward desired total power, too. Although, there might be more accurate methods to achieve the total power constraint, current method calls upon desired total power with few errors and without extra calculations.…”

Section: Practical Constraintsmentioning

confidence: 99%

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Designing the focused and wide beam pattern in linear and planar phased‐MIMO radar considering the antennas' overlap

Moghaddasi

Bizaki

2020

Int J Communication

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Summary Phased‐array multiple‐input multiple‐output (MIMO) radar is a new method for collocated MIMO radar, benefiting from its advantages without losing the coherent processing gain considered the main feature of phased‐array radars. In this method, the whole array is divided into several overlapping subarrays; then a waveform is allocated to the antennas of each subarray, which are orthogonal to other subarray's waveforms. In order to obtain a desired beam pattern, appropriate weighting coefficients for each subarray should be designed. This study aimed to design the phased‐MIMO radar's weighting coefficient matrix in two modes: In the first mode, the aim is to design a beam pattern, which has the maximum value in direction of the desired targets. In the second mode, a desired beam pattern is defined, and the coefficients should calculated in such a way that the obtained pattern be as much as possible compatible with the desired patter. In the two modes, the design, at first, is accomplished for linear array and then is extended to the planar array. Moreover, the impact of subarrays' overlap and the power constraints is investigated. The proposed methods, in special cases, are applicable in MIMO and phased‐array radars, too.

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Section: Simulation Resultsmentioning

confidence: 99%

\int_{T_{0}} bold-italics ((), t) s^{H} ((), t) italicdt = I_{K,}

…”

Section: System Modelmentioning

confidence: 99%

Section: Practical Constraintsmentioning

confidence: 99%

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Designing the focused and wide beam pattern in linear and planar phased‐MIMO radar considering the antennas' overlap

Moghaddasi

Bizaki

2020

Int J Communication

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“…The main concept of this new scheme is to place the transmitting beampattern nulls at the peak sidelobes of the waveform diversity beampattern and place the waveform diversity beampattern nulls at the peak sidelobes of the transmitting beampattern [9]. Additionally, a Phased-MIMO radar with unequal overlapped subarrays is proposed in [10]. The unequal size and greater length of the subarrays can not only provide the improvements of transmitting and receiving beampatterns but also enhance the output SINR of spatial beamforming.…”

Section: Introductionmentioning

confidence: 99%

An Array Partitioning Scheme of Airborne Phased-Mimo Radar Based on Stap Sinr

Wang¹,

Zou²,

Wang³

2018

PIER Letters

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An airborne phased-multiple-input-multiple-output (Phased-MIMO) radar with collocated antenna array is a tradeoff of phased array radar and MIMO radar. Its transmitting array is divided into multiple subarrays that are allowed to be overlapped. In this letter, we mainly study the array partitioning scheme of the airborne Phased-MIMO radar with equal uniform linear subarrays that are fully overlapped on the basis of space-time adaptive processing (STAP). A mathematical formula is derived to determine the number of subarrays and the elements in each subarray according to the principle of maximum STAP signal-to-interference-plus-noise ratio (SINR). The SINR performances corresponding to different partitioning schemes are simulated and discussed to demonstrate the effectiveness of the proposed mathematical formula for array partitioning in the sense of maximum STAP SINR.

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“…All these works divided the transmit array into subarrays of equal length. The authors of [12] presented a phased MIMO radar with unequal subarrays named HPMR-US, which divides the whole transmit array into overlapping and variable-sized partitions. It was shown that HPMR-US can provide a better directional gain than its equal-sized subarray counterpart.…”

Section: Introductionmentioning

confidence: 99%

Transmit Subaperturing for MIMO Radars with Nested Arrays

Mao

Zhang

2017

Signal Processing

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We consider a multiple-input multiple-output (MIMO) radar equipped with a colocated nested array for both transmit and receive. A novel transmit subaperturing (TS) approach that decomposes the nested array into unequal subarrays is proposed to take the advantage of the degrees of freedom (DOF) provided by the nested array but without resorting to spatial smoothing. Phased-array and the conventional MIMO with omni-directional transmission (omni-MIMO) are also extended to the nested array scenario, which utilize spatial smoothing to improve their DOF. Simulation results show that with sufficient training data, the omni-MIMO with nested array achieves the highest output signalto-interference-plus-noise ratio (SINR), while the TS-MIMO scheme outperforms the other methods when training is limited when the radar operates in a non-homogeneous environment. Keywords-Nested array (NA), subaperturing, transmit beamforming, degrees of freedom (DOF).

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Hybrid Phased MIMO Radar With Unequal Subarrays

Cited by 28 publications

References 11 publications

Designing the focused and wide beam pattern in linear and planar phased‐MIMO radar considering the antennas' overlap

Designing the focused and wide beam pattern in linear and planar phased‐MIMO radar considering the antennas' overlap

An Array Partitioning Scheme of Airborne Phased-Mimo Radar Based on Stap Sinr

Transmit Subaperturing for MIMO Radars with Nested Arrays

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