Performance Analysis of MIMO-Frequency Diverse Array Radar with Variable Logarithmic Offsets
نویسندگان
چکیده
Frequency diverse array (FDA) uses a small frequency increment at each antenna element to get a range, angle and time dependent beam pattern. Although linear frequency offset is used in most radar systems, nonlinear frequency offset is also very useful for analyzing FDA radar. A logarithmic frequency offsets based FDA (log-FDA) removes the inherent periodicity of FDA beam pattern to get a single maxima in area of interest. Multiple input multiple output frequency diverse array (MIMOFDA) radar has also been presented recently to provide some improvements compared to FDA radar. In this paper, a hybrid scheme has been proposed in which each subarray of MIMO-FDA uses a variable logarithmic offset. The resultant system, called MIMO-log-FDA, uses not only a different logarithmic offset, but also unique waveform in each subarray. Different logarithmic offsets have contributed in terms of getting more control on width of beam pattern, while the different waveforms have provided diversity, which can be exploited at the receiver of the proposed system. Some improvements in transmit beam patterns have been shown for MIMO-log-FDA, followed by detailed signal model for better estimation of target at the receiving side. Performance analysis has also been done in terms of signal to interference plus noise ratio (SINR) and Cramer-Rao lower bound (CRLB). Simulation and results have verified the effectiveness of proposed scheme by comparing it with Log-FDA and MIMO-FDA radar.
منابع مشابه
Performance of Target Detection in Phased-MIMO Radars
In this paper, the problem of target detection in phased-MIMO radars is considered and target detection performance of phased-MIMO radars is compared with MIMO and phased-array radars. Phased-MIMO radars combine advantages of the MIMO and phased-array radars. In these radars, the transmit array will be partitioned into a number of subarrays that are allowed to overlap and each subarray transmit...
متن کاملOn Clutter Ranks of Frequency Diverse Radar Waveforms
Frequency diverse (FD) radar waveforms are attractive in radar research and practice. By combining two typical FD waveforms, the frequency diverse array (FDA) and the steppedfrequency (SF) pulse train, we propose a general FD waveform model, termed the random frequency diverse multi-input-multioutput (RFD-MIMO) in this paper. The new model can be applied to specific FD waveforms by adapting par...
متن کاملRange-azimuth decouple beamforming for frequency diverse array with Costas-sequence modulated frequency offsets
Different from the phased-array using the same carrier frequency for each transmit element, the frequency diverse array (FDA) uses a small frequency offset across the array elements to produce range-angle-dependent transmit beampattern. FDA radar provides new application capabilities and potentials due to its range-dependent transmit array beampattern, but the FDA using linearly increasing freq...
متن کاملTransmit/Receive Beamforming and Interferences Cancellation Using Phased Mimo Radar with Full Waveform Diversity
APhased MIMO radar with full waveform diversity is proposed which divides the transmit array into overlapping subarrays in such a way that the number of subarrays are equal to the number of transmit antennas. Each subarray send sout a unique wave form towards the target of interest and thus provides a full waveform diversity, which results in the virtual extension of received array. This virtua...
متن کاملJoint Range and Angle Estimation Based on Sub- Array Scheme with Frequency Diverse Array Radar
Frequency Diverse Array (FDA) has its unique advantage in realizing Low Probability of Intercept (LPI) technology for its beam pattern is related to the range, time and angle. In this paper, a sub-array scheme of range-angle joint estimation of a target for Frequency Diverse Array (FDA) radar is proposed. To solve the problem of distance and angle response coupling of basic ULA FDA radar, the e...
متن کامل