To get the most use out of scarce spectrum, technologies have emerged that permit single systems to accommodate both radar and communications functions. Dual-function communication (DFRC) systems, where two same platform share hardware spectral resources, form a specific class radio-frequency (RF) technology. These support applications data, whether as target waveform parameter information or independent operation, are efficiently transmitted using aperture frequency bandwidth. This is...

In this paper, we propose co-prime arrays for effective direction-of-arrival (DOA) estimation. To fully utilize the virtual aperture achieved in difference co-array constructed from a array structure, sparsity-based spatial spectrum estimation technique is exploited. Compared to existing techniques, proposed achieves better utilization of and thus results increased degrees-of-freedom as well improved DOA performance.

The theoretical feasibility is explored of spectrum-sharing between radar and wireless communications systems via an interference mitigation processing approach. new approach allows to operate at the same carrier frequency if possesses a multiple-input multiple-output (MIMO) structure. A novel signal developed for coherent MIMO that effectively minimizes arbitrary interferences generated by from any direction, while operating using cognitive radio technology. Various aspects are...

The parametric adaptive matched filter (PAMF) for space-time processing (STAP) is introduced via the (MF), multichannel linear prediction, and LDU decomposition. Two alternative algorithmic implementations of PAMF are discussed. Issues considered include sample training data size constant false alarm rate (CFAR). Detection test statistics estimated airborne phased array radar measurements, probability detection using simulated surveillance scenarios. For large sizes, performs close to MF;...

This paper addresses target detection in passive multiple-input multiple-output (MIMO) radar networks comprised of non-cooperative transmitters and multichannel receivers. A generalized likelihood ratio test is derived, approximate statistic distributions are presented for both hypotheses under common scenario conditions. Analysis simulation results show that this detector outperforms other MIMO detectors because it exploits more correlations within the measurement data. also compared...

In this paper, we consider moving target detection using a distributed multiple-input multiple-output (MIMO) radar on stationary platforms in nonhomogeneous clutter environments. Our study is motivated by the fact that multistatic transmit-receive configuration MIMO causes nonstationary clutter. Specifically, power for same test cell may vary significantly from one pair to another, due azimuth-selective backscattering of To account these issues, new model, where resides low-rank subspace...

In this paper, an integrated cubic phase function (ICPF) is introduced for the estimation and detection of linear frequency-modulated (LFM) signals. The ICPF extends standard (CPF) to handle cases involving low signal-to-noise ratio (SNR) multi-component LFM asymptotic mean squared error (MSE) ICPF-based estimator as well output SNR detector are derived in closed form verified by computer simulation. Comparison with several existing approaches also included, which shows that serves a good...

We present a transmit subaperturing (TS) approach for MIMO radars. A TS-MIMO radar offers continuum of operating modes from the phased-array radar, which achieves maximum directional gain but least interference rejection ability, to omni-directional transmission based can handle largest number sources no gain. Tuning system be made by changing configuration subapertures, provides direct trade-off between and power. The output SINR is examined in an training limited environment.

An effective complex multitask Bayesian compressive sensing (CMT-BCS) algorithm is proposed to recover sparse or group signals. The existing (MT-CS) powerful in recovering multiple real-valued solutions. However, a large class of problems deal with values. A simple approach, which decomposes value into independent real and imaginary components, does not take account the sparsity these two components thus yields poor recovery performance. In this paper, we first introduce CMT-BCS that jointly...

This work addresses the problem of target detection in passive multiple-input multiple-output (MIMO) radar networks without utilization direct-path reference signals. A generalized likelihood ratio test for this is derived, and distribution statistic identified under both hypotheses. Equivalence established between MIMO references source localization networks. Numerical examples demonstrate important characteristics detector, namely, asymmetric contributions to performance from transmitters...

This paper considers moving target detection (MTD) with distributed multi-input multi-output (MIMO) radars in non-homogeneous environments, where the received disturbance signal (clutter and noise) exhibits non-homogeneity not only power but also covariance structure from one transmit-receive (TX-RX) antenna pair to another as well across different test cells. To address this problem, we introduce a parametric approach by employing set of distinctive auto-regressive (AR) models, for each...

The dual use of radio signals for simultaneous operation radar and communications has recently attracted significant interest. In this paper, we develop a method information embedding into the emission multiple-input multiple-output (MIMO) using frequency-hopping (FH) waveforms. set orthogonal waveforms used to implement primary MIMO is generated FH codes. secondary communication function implemented by one phase-shift keying (PSK) symbol in each frequency hop, i.e., number embedded symbols...

This paper considers the problem of passive detection with a multistatic radar system involving noncooperative illuminator opportunity (IO) and multiple receive platforms. An unknown source signal is transmitted by IO, which illuminates target interest. These platforms are geographically dispersed, collect independent echoes due to illumination same IO. We consider generalized canonical correlation (GCC) detector for requires knowledge noise power. derive closed-form expressions...

We jointly design the transmit and receive beamforming based on a-priori information locations of target interferences in an active array, where each element emits same waveform up to a complex scalar. A sequential optimization algorithm is proposed maximize output signal-to-interference-plus-noise ratio (SINR). Numerical results demonstrate that significant gain SINR can be achieve this compared conventional phased-array radar omnidirectional multiple-input-multiple-output (MIMO) radar.

Since the seminal paper by Marzetta from 2010, Massive MIMO paradigm in communication systems has changed being a theoretical scaled-up version of MIMO, with an infinite number antennas, to practical technology. Its key concepts have been adopted 5G new radio standard and base stations, where 64 fully-digital transceivers commercially deployed. Motivated these recent developments, this considers co-located radar M <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

We study issues associated with applying space-time adaptive processing (STAP) techniques in bistatic airborne applications. consider the performance of several STAP approaches different scenarios. Specific consideration is given to effects clutter spectral dispersion on covariance estimation and algorithm's resulting rejection capability. Our prime focus emphasizes methods capable high efficient utilization training data. A deterministic two-dimensional compensation used align centers thus...

The key to the feasibility of spectrum sharing between radar and wireless systems is effective mainlobe interference mitigation processing by radar. Traditional array capable cancel sidelobe interferences only. This letter presents an innovative beamforming approach, first its kind, eliminate in both directions based on a coherent phase-coding multiple-input multiple-output (MIMO) platform. theoretical proof conditions simultaneous cancellation target detection using MIMO are mathematically...

We consider the problem of joint delay-Doppler estimation a moving target in passive radar that employs non-cooperative illuminator opportunity (IO) for illumination, reference channel (RC) steered to IO obtain signal, and surveillance (SC) monitoring. practically motivated scenario, where RC receives noise-contaminated copy signal SC observation is polluted by direct-path interference usually neglected prior studies. develop data model without discretizing parameter space, which may lead...

This paper examines moving target detection in distributed multi-input multi-output radar with sensors placed on platforms. Unlike previous works which were focused stationary platforms, we consider explicitly the effects of platform motion, exacerbate location-induced clutter non-homogeneity inherent such systems and thus make problem significantly more challenging. Two new detectors are proposed. The first is a sparsity based detector which, by exploiting sparse representation Doppler...

This paper deals with the problem of detecting a moving range-spread target in distributed MIMO radar. A new knowledge-aided (KA) model that takes into account nonhomogenous characteristics disturbance (clutter and noise) radar is proposed. Specifically, covariance matrices corresponding to different transmit-receive (Tx-Rx) pairs are modeled as random matrices. These share prior matrix structure but power levels nonhomogeneous clutter powers across Tx-Rx pairs. Two cases considered,...

Although radar and communication systems so far have been considered separately, recent advances in passive motivated us to propose a unified system, capable of fulfilling the requirements both communications. In this paper, we provide performance tradeoff analysis for system consisting transmitter, receiver, receiver (CR). The total power is allocated transmitting waveforms information signals such way that probability detection (PD) maximized, while satisfying rate requirement CR. An exact...

A non-repeating, spectrum-optimized FM waveform suitable for radar pulse agility is described. The an alternative manifestation of the recently developed pseudo-random optimized (PRO) FMCW framework noise radar, now implemented in a pulsed form. Each iteratively to match spectrum shape with low range sidelobes and good spectral properties, while random initialization each ensures sufficient diversity that resulting form unique, thereby providing decoherence sidelobes. performance this...