| 1. |
- Rowe, W.L., et al.
(författare)
-
Frequency division orthogonal waveforms for narrowband MIMO arrays
- 2013
-
Ingår i: IEEE International Symposium on Phased Array Systems and Technology. ; , s. 421-427
-
Konferensbidrag (refereegranskat)abstract
- Multiple-Input Multiple-Output arrays with closely spaced antennas typically utilize orthogonal waveforms to create a larger virtual aperture. Orthogonality between waveforms can be achieved using time, Doppler, coding, or frequency division. In this work we examine the method of generating frequency diverse waveforms. In general, the frequency division approach generates waveforms that have reduced bandwidth which results in reduced range resolution. To overcome this loss of range resolution more spectrum must be utilized which might not be compatible with narrowband arrays. Herein, we present an approach for generating a notched waveform set that preserves range resolution, is effectively orthogonal, and could be utilized by narrowband arrays.
|
|
| 2. |
- Rowe, W.L., et al.
(författare)
-
Robust adaptive beamforming for MIMO monopulse radar
- 2013
-
Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9780819495051 ; 8714
-
Konferensbidrag (refereegranskat)abstract
- Researchers have recently proposed a widely separated multiple-input multiple-output (MIMO) radar using monopulse angle estimation techniques for target tracking. The widely separated antennas provide improved tracking performance by mitigating complex target radar cross-section fades and angle scintillation. An adaptive array is necessary in this paradigm because the direct path from any transmitter could act as a jammer at a receiver. When the target-free covariance matrix is not available, it is critical to include robustness into the adaptive beamformer weights. This work explores methods of robust adaptive monopulse beamforming techniques for MIMO tracking radar.
|
|
| 3. |
- Ström, Marie, 1984, et al.
(författare)
-
Robust transceiver design for wideband MIMO radar utilizing a subarray antenna structure
- 2013
-
Ingår i: Signal Processing. - : Elsevier BV. - 0165-1684. ; 93:12, s. 3541-3552
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, we investigate the possibility to suppress interference in wideband multiple-input multiple-output radar. The idea is to employ tunable filters at the transmitter and the receiver sides, and to derive filter coefficients that result in optimal transmitted signals from a system performance point of view, for a given radar scenario. The system performance is measured in signal-to-interference-and-noise ratio (SINR) at the receiver output, from which the filter properties are derived. The focus is to suppress active jamming interference, and especially deceptive jamming interference. We discuss two ways to derive the transmit and the receive filters. Each procedure utilizes two different power constraints related to the transmit filters. To incorporate imperfections in the given scenario, a robust extension to the design problem is proposed. Two different robust methods are evaluated: one that utilizes a Taylor series expansion of the SINR, and one that exploits a worst-case SINR maximization. Numerical validation illustrates the possibility to suppress interference without actually forming a spatial null in the direction towards interference, and the necessity to design transmit filters that are robust to uncertainties in the given scenario. (C) 2013 Elsevier B.V. All rights reserved.
|
|
