Phasedmimo radar with frequency diversity for rangedependent beamforming hybrid phased mimoradar embedded plus solution. We propose a new multipleinput, multipleoutput mimo radar system with colocated antennas that can greatly reduce target fluctuations. The mimo radar stap for multipath clutter mitigation can be found in 10. Time division multiplexing tdm is one way to achieve orthogonality among transmit channels. Qureshi2, abdul basit1, aqdas naveed1, and adnan umar1 abstract frequency diverse array fda uses a small frequency increment at each antenna element to get a range, angle and time dependent beam pattern. Mainlobe jamming suppression using improved frequency. Frequency diverse array fda has its unique advantage in realizing low probability of intercept lpi technology for its dependent beam pattern. Instead the signal is reflected along multiple paths before.
However, grating lobes would change to different positions if the frequencies of the radiated waveforms. Jun 15, 2017 frequency diverse array fda radar has been proposed in last decade for joint range and angle beamforming of a target. Like mimo communications, mimo radar offers a new paradigm for signal processing research. The authors in 3 and 4 considered optimal frequencyhopping waveform designs for colocated mimo radar, but the frequencyhopping codes and. The distinguishing features of mimo radar and fda radar are waveform diversity and frequency diversity, respectively, while their phasedarray counterpart lacks any such diversity. Qureshi2, abdul basit1, aqdas naveed1, and adnan umar1 abstractfrequency diverse array fda uses a small frequency increment at each antenna element to get a range, angle and time dependent beam pattern. Sparse frequency diverse mimo radar imaging for offgrid. For diversity mimo radar, it is expected that the target echo signals received in diversity channels are statistically independent with each other. The use of diversity techniques at both ends of the link is termed spacetime coding. Combining the advantages of fda and mimo radar, fdamimo radar can steer multiple beams to different. In this paper, design of discrete frequencycoding waveform dfcw using linear chirp lc pulse and pseudonoise pn code sequence is proposed to improve the. The authors explore a special polarisation and frequency diverse mimo pfd mimo radar system here. Ofdm mimo radar waveform design for targets identification. Index termsmultipleinput multipleoutput radar, frequency diverse array.
Multipleinput multipleoutput mimo radar is an advanced type of phased array radar employing digital receivers and waveform generators distributed across the aperture. The radar referred to as fdamimo radar employs a slight frequency increment across the elements so that the rangeangledependent beam pattern is achieved 5. According to the types of diversity information, diversity mimo radar can be divided into two types. The proposed mimo radar system results in a radar array with frequencydivision multiplexing that can also incorporate beamforming to design the transmission. The frequencyhopping waveforms, proposed in 8, were originally designed for multiuser communications. Design of discrete frequencycoding waveforms using phase. A preferable property of hfswr is that it can detect and track ship and aircraft targets beyond. Target spatial and frequency scattering diversity property. The remainder of this example shows how to model and simulate a tdmmimo frequencymodulated continuous wave fmcw automotive radar system. Collocated mimo radar systems exploit the waveform diversity, based on. Introduction multipleinput multipleoutput mimo radar is an. Mimo radar with frequency diversity jun jason zhang and antonia papandreousuppappola department of electrical engineering, arizona state university, tempe, az, usa email.
Mainlobe jamming suppression using improved frequency diverse. Fda radar has also been presented recently to provide some improvements. Mimo radar with frequency diversity ieee conference. Performance analysis of mimofrequency diverse array radar with variable logarithmic o. Diversity coding is the spatial coding techniques for a mimo system in wireless channels.
Mimo ofdm radar systems structure in 1, ofdm technique has the advantage of combating the frequency selective fading drawback for a narrowband system. Mimo radar transmitter design that can exploit frequency diversity. These beams help to localize the target in range as well as angle dimension. The mimo radar system with frequency diversity fdmimo has been researched widely in the recent years 24, since its range resolution can be further improved by simultaneously fusing the echoes coming from different transmitters to form a wideband signal 5. Considering the many advantages of phase coded pulse waveforms in radar applications, this paper derives the mimo radar ambiguity function of phased coded pulse waveforms. Phasedmimo radar with frequency diversity for range. A method based on frequency diversity to suppress grating lobes in coherent mimo radar with separated subapertures is proposed. Both distributed and colocated mimo radars exploit waveform diversity, and it has been shown that both radars have many advantages. In this paper, a new hybrid scheme is proposed in which each subarray of mimofda uses a variable logarithmic offset. This turns the researchers toward making use of such advantage to be imposed in mimo radar systems.
Distributed mimo radar improves performance by exploiting spatial diversity, whereas colocated mimo radar exploits waveform diversity. In this paper, whenever we mention mimo radar, we are referring to colocated mimo radar. Joint polarisation and frequency diversity for deceptive. Performance analysis of mimofrequency diverse array. In the pfd mimo radar system, polarisation and frequency diversity are employed in the transmit array, and twodimensional vector sensors are adopted in the receive array to measure the horizontal and vertical components of the received signals. A similar approach was used in 41 in the context of mimo synthetic aperture radar sar with orthogonal frequencydivision multiplexing linear frequency modulated ofdm lfm waveforms, where. In this paper, we proposed a cognitive radar based on the frequency diverse array multipleinput multipleoutput mimo. Multipleinput multipleoutput mimo radar can offer waveform diversity to increase the virtual aperture length for azimuth coherent focus processing in radar imaging. It capitalizes on the independence of transmitted and received signals and on the diversity of target scattering by viewing the target from multiple aspects. Waveform diversity and mimo radar communications university. In the pfdmimo radar system, polarisation and frequency diversity are employed in the transmit array. Detection and characterization of mimo radar signals. It is possible to suppress the clutters e ectively by properly utilizing the diversity information. However the mimo radar allows the multiple antennas to transmit arbitrary waveforms.
Hence, here we focus our research on the fdmimo radar imaging. Mimo radar ambiguity properties and optimization using. Aug 27, 2015 phased mimo radar with frequency diversity for rangedependent beamforming hybrid phased mimoradar embedded plus solution. Frequency diverse array fda has attracted much attention in recent years due to its rangeangledependent beampattern. Digital beamforming in mimoradar with frequency diversity.
Discrete frequency and phase coding waveform for mimo radar. Cognitive mimo frequency diverse array radar with high lpi. Application of frequency diversity to suppress grating lobes. However, instead of distributing the radar elements throughout the surveillance area, antennas are closely located to obtain better spatial resolution, doppler resolution, and dynamic range. Frequency diversity radar in order to overcome some of the target size fluctuations many radars use two or more different illumination frequencies. Multipleinput multipleoutput radar waveform diversity design has received much attention, but many of existing waveforms are lack of a large timebandwidth product. Pratt, senior member, ieee yihfang huang, fellow, ieee zhenhua gong mike lemmon, member, ieee university of notre dame we consider the problem of subspace optimization for centralized noncoherent multiple inputmultiple output mimo radar based on various measures such as capacity, diversity, and probability of detection. The essence of the proposed technique is to divide the frequency diverse array transmit array into multiple subarrays, each subarray coherently transmits a distinct waveform with a small frequency increment across the array elements. Concepts, performance enhancements, and applications 65 keith w. To implement lpi of fda mimo transmit signals, a scheme for array weighting design is proposed, which is to minimize the energy. Phasedmultipleinput and multipleoutput mimo radar is a flexible technique which enjoys the advantages of mimo radar without sacrificing. Joint range and angle estimation using mimo radar with. In this paper, we propose a new phased mimo radar with frequency diversity for rangedependent beamforming.
This paper proposes an orthogonal frequency division multiplexing ofdm chirp waveform diversity design scheme to generate four waveforms with good correlation properties, ambiguity performance and doppler. Frequency diversity typically uses two transmitters operating in tandem to illuminate the target with two separate frequencies like shown in the picture. However, quantitive metrics of fda radars clutter suppression performance are still inadequate. The frequency hopping waveforms, proposed in 8, were originally designed for multiuser communications. A similar approach was used in 41 in the context of mimo synthetic aperture radar sar with orthogonal frequency division multiplexing linear frequency modulated ofdm lfm waveforms, where. Frequencydiversity frequency diversity is a technique that can signi. Research open access joint doddoa estimation in mimo. In general, the existing mimo radar with frequency diversity can be generally classified into two categories. Performance analysis of mimofrequency diverse array radar. The signal processing algorithm for diversity mimo radar depends highly on the statistical property of target.
Mimo radar signals propagate in a fashion similar to multistatic radar. Mimo radar may also be used to obtain lowprobabilityofintercept radar properties. Mimo radar ambiguity function of frequency hopping waveforms is recently derived. Multiple input multiple output frequency diverse array mimofda radar has also been presented recently in literature to steer multiple beams by creating subarrays in transmit array. High resolution mimohfswr radar using sparse frequency. High frequency surface wave radar hfswr is a lowcost radar system that adopts vertically polarized high frequency electromagnetic signals which propagate along the ocean surface. On clutter ranks of frequency diverse radar waveforms. Mimo radar uses spatially distributed multiple transceivers. In order to overcome some of the target size fluctuations many radars use two or more different illumination frequencies. However, in the mimo radar, the stap becomes even more challenging because of the extra dimension created by the orthogonal waveforms.
Mimo radar with frequency diversity ieee conference publication. Joint frequencyhopping waveform design for mimo radar. Discrete frequency and phase coding waveform for mimo. The remainder of this example shows how to model and simulate a tdm mimo frequency modulated continuous wave fmcw automotive radar system. Mimo radar can obtain plenty of diversity information of target echoes. Request pdf digital beamforming in mimoradar with frequency diversity the aim of this work is to develop an algorithm of digital beam forming for coherent mimo radar with frequency diversity. These advantages include improved angle estimation and target detection.
Performance analysis of mimofrequency diverse array radar with. Antenna diversity, also known as space diversity or spatial diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a wireless link. Without frequency offset no diversity with frequency offset. Numerical results are presented to validate the effectiveness of the proposed approach. The statistical property of target echo signals received. Research article transmit waveform optimization for spatial. However, grating lobes would change to different positions if the frequencies of the radiated. In section iv, we develop the crlb for estimating moving target parameters using the proposed radar system, and we provide some corresponding numerical examples in section v. The proposed mimo radar system results in a radar array with frequency division multiplexing that can also incorporate beamforming to design the transmission beam pattern.
Each transmit antenna radiates an arbitrary waveform independently of the other transmitting antennas. In this paper, mimo ground moving target indication gmti radar is addressed. The authors in 3 and 4 considered optimal frequency hopping waveform designs for colocated mimo radar, but the frequency hopping codes and. Application of frequency diversity to suppress grating. Pdf we propose a new multipleinput, multipleoutput mimo radar system with colocated antennas that can greatly reduce target fluctuations. As we can see, there are nr receiver antennas and each antenna can receive. Mimo radar signals from an electronic surveillance perspective rather than to remark on other merits of mimo radar. Increasing angular resolution with mimo radars matlab. By transmitting orthogonal waveforms from separated subapertures or subarrays, receiving beams can be formed at the receiving end with the same mainlobe direction.
Pier c online performance analysis of mimofrequency. On one hand, the extra dimension increases the rank of the jammer and. Multipleinput multipleoutput mimo extensions to radar systems enable a number of advantages compared to traditional approaches. Vaidyanathan, fellow, ieee abstractthe concept of mimo multipleinput multiple output radars has drawn considerable attention recently. The use of multiple antennas at both transmit and receive results in a multipleinput multipleoutput mimo system. Large timebandwidth product ofdm chirp waveform diversity. Distributed multiple inputmultiple output mimo subspace. However, instead of distributing the radar elements throughout the surveillance area, antennas are closely located to obtain better spatial resolution. N2 we propose a new multipleinput, multipleoutput mimo radar system with colocated antennas that can greatly reduce target fluctuations. Simulation and results verify the effectiveness of proposed scheme by comparing it with logfda and mimofda radar. Mimoofdm radar systems structure in 1, ofdm technique has the advantage of combating the frequency selective fading drawback for a narrowband system. The authors explore a special polarisation and frequency diverse mimo pfdmimo radar system here. The first type is mimo radar with frequency diverse array fda.
Research article transmit waveform optimization for. Multiple input multiple output frequency diverse array mimo. Frequency diverse array fda radar has been proposed in last decade for joint range and angle beamforming of a target. The joint exploitation of polarisation and frequency diversity is considered here as a way to improve the deceptive jamming suppression capability in multipleinput multipleoutput mimo radar. Mimo radar ambiguity optimization using phase coded. Mimo radar with frequency diversity semantic scholar. Statistical multipleinput multipleoutput mimo radar, e.
Due to the different waveforms, the echo signals can. The hybridization form of mimo and phasedarray radars, called phased mimo radar. Receiver architecture the receiver design of the mimo radar with frequency diversity is shown in fig. Pdf mimo radar with frequency diversity researchgate. Multiple inputmultiple output mimo radar 16is jointly. We show that the waveform diversity afforded by mimo radar enables a much improved parameter identi.713 1562 436 1344 584 847 554 104 1289 1473 1155 963 886 1489 122 891 113 1286 170 667 883 684 1492 349 3 788 40 1381 16 955 1491 466 34 278 1187