The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multi-carrier (MC) multiple-input multiple-output (MIMO) radar offers an additional degree of freedom in the array optimization through the carrier frequencies. In this paper, we study the MC-MIMO array optimization with respect to the direction of arrival (DOA) estimation based on the Cramer-Rao bound (CRB). In particular, we choose the transmit and receive antenna positions as well as the carrier...
A novel orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) radar concept for automotive applications is presented in this paper. Multiple transmit antennas are multiplexed via OFDM subcarrier interleaving. Such a multiplexing enables a simultaneous operation of transmit antennas utilizing the complete bandwidth. Whereas the known OFDM-MIMO radar concepts use an...
Multi-carrier (MC) multiple-input multiple-output (MIMO) radar was recently applied to build sparse virtual arrays with a large aperture for a high-accuracy direction-of-arrival (DOA) estimation. The resulting grating lobes (DOA ambiguities) were resolved using multiple carriers. One problem of MC-MIMO is the coupling of the unknown parameters range and DOA. In this contribution, we study this range-DOA...
A novel concept of orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) radar for automotive applications is presented in this paper. Multiple transmit antennas are multiplexed via OFDM subcarrier interleaving. Such a multiplexing enables a simultaneous operation of transmit antennas, while the complete bandwidth is utilized by each of them. Whereas the known OFDM-MIMO...
In sky-wave over-the-horizon radar (OTHR), it is quite difficult to handle the issues of target location (ground range) and height (altitude) estimation due to their joint effect on group range. This work addresses the joint estimation of target location and height by the means of multipath propagation of OTHR signals and structure of a two-dimensional (2D) array. Usually, the multipath signal results...
For spatially distributed targets encountered in radar and sonar applications, direct application of subspace-based methods usually do not lead to an accurate estimation of the direction and angular extent of the signal arrivals. If the spatial distribution of the targets can be parameterized with a known model a priori, the direction-of-arrival (DOA) estimation problems can be simplified as parameter...
This paper presentes a new scheme for joint direction-of-departure (DOD) and direction-of-arrival (DOA) estimation in multiple-input multiple-output (MIMO) radar using a wideband orthogonal frequency division multiplexing (OFDM) signal. The scheme utilizes a two-way multiple signal classification (MUSIC) algorithm at each of the sub-carriers to estimate the DOD and DOA, and combines the estimated...
Recent years have shown how the performances of the standard radar systems can be significantly improved by using a multiple-input multiple output (MIMO) approach. MIMO technique is an already well studied method for communications applications thanks to the benefits that it offers in multipath fading environments. This paper is aimed to present the design of a new MIMO based, short range, surveillance...
We investigate the topic for the direction of departure (DOD) and direction of arrival (DOA) estimation in bistatic multiple-input-multiple-output (MIMO) radar systems with the exploitation of array invariance. Several MUSIC-derived algorithms for angle estimation in MIMO radar have been presented and compared for their complexity costs against that of ESPRIT. The proposed scheme of multi-invariance...
In this paper, a new joint direction of departure (DOD) and direction of arrival (DOA) estimation method is presented for bistatic multiple input multiple output (MIMO) radar. Because all the diagonal elements of the transmitting and receiving invariance matrices are located on the unit circle of the complex plane, we construct a complex matrix so that the DOD and DOA pairing is given automatically...
A computationally efficient direction-of-arrival (DOA) estimation algorithm is proposed for the multiple-input multiple-output (MIMO) radar with uniform linear array (ULA). In the proposed algorithm, the ULA structure is exploited to greatly reduce the array vector dimension, which results in a significant decrease in computational complexity. The effectiveness of the algorithm is verified by simulations.
Previously, the Generalized Likelihood Ratio Test - Linear Quadratic (GLRT-LQ) has been extended to the Multiple-Input Multiple-Output (MIMO) case where all transmit-receive subarrays are considered jointly as a system such that only one detection threshold is used. The new MIMO detector is Constant False Alarm Rate (CFAR) with respect to the clutter power fluctuations. In this paper, the adaptive...
In this paper, the rank of clutter covariance matrix (CCM) is studied for space-time adaptive processing (STAP) implemented on the multiple-input multiple-output (MIMO) radar with waveform diversity. It is found that the clutter rank is dependent on the rank and structure of the covariance matrix of the transmitting waveforms, and that clutter rank of orthogonal waveforms acts as the upper bound for...
We propose an agile sensing algorithm to optimally select the transmission waveform of a multiple-input, multiple-output (MIMO) radar system in order to improve target localization. Specifically, we first derive the Cramer-Rao lower bound (CRLB) for the joint estimation of the antenna reflection coefficients and the range and direction-of-arrival of a stationary target using MIMO radar with colocated...
The multiple-input multiple-output (MIMO) radar system is a new kind of radar technology. It can choose flexibly the probing signals transmitted via its antennas or increase the inter-element distance to reduce the cross-correlation of the signals, so that the spatial diversity gain can be obtained. Waveform design is one of the important topics of the MIMO radar. We discuss here the waveform design...
A distributed MIMO radar is considered, in which the transmit and receive antennas belong to nodes of a small scale wireless network. The transmit waveforms could be uncorrelated, or correlated in order to achieve a desirable beampattern. The concept of compressive sampling is employed at the receive nodes in order to perform direction of arrival (DOA) estimation. According to the theory of compressive...
Optimum antenna placement is considered for MIMO radar performing velocity estimation. A general optimization strategy for velocity estimation using MIMO radar is derived based on the Cramer-Rao bound analysis. Optimal antenna placement is investigated.We show that when orthogonal signals are adopted for transmission, symmetrically placing the transmit antennas as well as the receive antennas achieves...
This paper proposes two subspace algorithms, named S-MUSIC and S-SSMUSIC, based on the MUSIC and SSMUSIC algorithms for direction finding in MIMO array systems, which achieve improved performance by exploiting the waveform information about the transmitted signals. Numerical results show that the proposed algorithms outperform their traditional counterparts at low SNR.
The concept of multiple-input multiple-output (MIMO) radar is recently proposed inspired by recent advances in MIMO communications. A recently proposed statistical MIMO radar configuration is considered here, in which the transmit array antennas are widely spaced to enable spatial diversity with respect to the targets, while the receiver is an uniform linear array with the elements spaced half a wavelength...
This paper addresses a new perspective on the exploitation of diversity resembling recent seminal proposals with multiple antennas known as MIMO radar. Our focus pursues similar advantages as spatial MIMO systems but intending to achieve the desired resistance over fading or/and SNR increase without relying on multiple antennas. We design an OFDM-CDM waveform well inspired in modern communications...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.