phased array radar thesis

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Phased array radar thesis

Additionally, millimeter wave mm-wave frequencies are expected to play an integral role in 5G, and are deemed well-suited for inspecting structural components used in the aerospace industry. Abstract : This thesis considers problems related to the design and the analysis of wide-angle scanning phased arrays.

The goals of the thesis are the design and analysis of antenna elements suitable for wide-angle scanning array antennas, and the study of scan blindness effects and edge effects for this type of antennas. Abstract See yesterday's most popular searches here. Search and download doctoral PHD dissertations from Sweden. In English. For free. Show downloadable dissertations only. Search for dissertations about: "phased array antennas" Showing result 1 - 5 of 12 swedish dissertations containing the words phased array antennas.

Miniaturized Hard Waveguides in Multifunction Array Antennas Author : Malcolm Ng Mou Kehn ; Chalmers University of Technology ; [] Keywords : interlaced arrays ; Floquet theorem ; reflector antennas ; focal plane array ; multifunction antennas ; miniaturized waveguides ; multilayer structures ; spectral domain technique ; periodic structures ; aperture reuse ; method of moments ; soft and hard surfaces ; array antennas ; Abstract : Recent advances in technologies of wireless communications systems have led to an increasing desire for several antennas performing diverse functions at different frequencies to be integrated into a common radiating aperture.

Phased array calibration and beamforming using signal processing Author : Maria Lanne ; Chalmers University of Technology ; [] Keywords : mutual coupling ; calibration ; array imperfections ; beampattern synthesis ; adaptive beamforming ; convex optimization. Genetic algorithms as a tool for phased array radar design. Author Bartee, Jon A. Advisor Melich, Michael. Metadata Show full item record. Abstract The United States Navy needs creative ways to design multi-function phased array radars.

This thesis proposes that Genetic Algorithms, computer programs that mimic natural selection to arrive at innovative solutions to complex problems, would be particularly well suited to this task. The ability of a Genetic Algorithm to properly predict the behavior of an array antenna with randomly located elements was examined with encouraging results through the construction and measurement of a test array.

Comparison of test data to Genetic Algorithm and Method of Moments calculations showed significant qualitative agreement in the antenna test patterns of a thin, randomly distributed array. Areas of disagreement between the test article pattern and the calculated ones were traced to systematic errors in the anechoic chamber and alignment error during antenna positioning.

The final experiment to demonstrate beam steering was not completed due to lack of time and poor response of mechanical phase shifters. Despite the inability to demonstrate beam steering, the early experiments demonstrate the significant potential for using Genetic Algorithms for complex shipboard phased array radar antenna design. Rights This publication is a work of the U. Copyright protection is not available for this work in the United States.

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Phased array radar thesis This report focuses on designing a new wideband antenna array as part of an integrated radar system to detect small objects, The detection in this thesis is limited to sensing breathing rate, although heartbeat detection is considered a possibility. The final experiment to demonstrate beam steering was not completed due to lack of time and poor response of mechanical phase shifters. Advanced Search. Enter search terms:.
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A virtual array can be created by quasi-monostatic MIMO radars, where the transmit and receive arrays are closely located. To better understand the virtual array concept, first look at the two-way pattern of a conventional phased array radar. The two-way pattern of a phased array radar is the product of its transmit array pattern and receive array pattern. For example, consider a 77 GHz millimeter wave radar with a 2-element transmit array and a 4-element receive array.

If both arrays have half-wavelength spacing, which are sometimes referred to as full arrays, then the two-way pattern is close to the receive array pattern. If the full transmit array is replaced with a thin array, meaning the element spacing is wider than half wavelength, then the two-way pattern has a narrower beamwidth.

Notice that even though the thin transmit array has grating lobes, those grating lobes are not present in the two-way pattern. Thus, by carefully choosing the geometry of the transmit and the receive arrays, we can increase the angular resolution of the system without adding more antennas to the arrays.

In a coherent MIMO radar system, each antenna of the transmit array transmits an orthogonal waveform. Because of this orthogonality, it is possible to recover the transmitted signals at the receive array. The measurements at the physical receive array corresponding to each orthogonal waveform can then be stacked to form the measurements of the virtual array. Note that since each element in the transmit array radiates independently, there is no transmit beamforming, so the transmit pattern is broad and covers a large field of view FOV.

This allows the simultaneous illumination of all targets in the FOV. The receive array can then generate multiple beams to process all target echoes. Compared to conventional phased array radars that need successive scans to cover the entire FOV, this is another advantage of MIMO radars for applications that require fast reaction time. Time division multiplexing TDM is one way to achieve orthogonality among transmit channels.

Imagine that there are two cars in the FOV with a separation of 20 degrees. As seen in the earlier array pattern plots of this example, the 3dB beamwidth of a 4-element receive array is around 30 degrees so conventional processing would not be able to separate the two targets in the angular domain.

The radar sensor parameters are as follows:. The data cube received by the physical array must be processed to form the virtual array data cube. For the TDM-MIMO radar system used in this example, the measurements corresponding to the two transmit antenna elements can be recovered from two consecutive sweeps by taking every other page of the data cube.

Now the data cube in xr1 contains the return corresponding to the first transmit antenna element, and the data cube in xr2 contains the return corresponding to the second transmit antenna element. Hence, the data cube from the virtual array can be formed as:. Next, perform range-Doppler processing on the virtual data cube. Because the range-Doppler processing is linear, the phase information is preserved. Therefore, the resulting response can be used later to perform further spatial processing on the virtual aperture.

The resulting resp is a data cube containing the range-Doppler response for each element in the virtual array. As an illustration, the range-Doppler map for the first element in the virtual array is shown. The detection can be performed on the range-Doppler map from each pair of transmit and receive element to identify the targets in scene.

In this example, a simple threshold-based detection is performed on the map obtained between the first transmit element and the first receive element, which corresponds to the measurement at the first element in the virtual array. Based on the range-Doppler map shown in the previous figure, the threshold is set at 10 dB below the maximum peak. Based on the detected range of the targets, the corresponding range cuts can be extracted from the virtual array data cube to perform further spatial processing.

To verify that the virtual array provides a higher resolution compared to the physical array, the code below extracts the range cuts for both targets and combines them into a single data matrix. The beamscan algorithm is then performed over these virtual array measurements to estimate the directions of the targets. The two targets are successfully separated. The actual angles for the two cars are and 10 degrees.

In this example, the detection is performed on the range-Doppler map without spatial processing of the virtual array data cube. Radar, as a remote sensing tool, has been used extensively to characterise and monitor the dynamics of snow avalanches. Having such data, it is possible to mathematically model snow avalanches.

There are other different types of techniques such as video imaging and using seismic sensors to extract snow avalanche dynamics. However, the former cannot be used during the night and latter cannot be used to detect the avalanche outer layers as these types of sensors are usually buried under the track of the avalanche in the ground.

Therefore, the radar is one of the best techniques which can be utilised for avalanche imaging applications. The avalanche models can be used to evaluate and identify avalanche risk zones and gather statistical data. However, previously developed radar systems cannot provide accurate representations of the flow of snow avalanches due to their inadequate range and cross-range resolution and high antenna sidelobe levels.

For this application an antenna with beam steering capability was required to be able to illuminate the entire flow of the avalanche such as phased array antenna. This thesis presents the design and development of an advanced phased array FMCW radar receiver front-end, allowing the provision of high resolution two dimensional images of snow avalanches.

The sub arraying overlapping technique is used to eliminate the grating lobes. The design of the radiating elements of this phased array antenna is also presented in detail based on an extensive review of the existing literature. Moreover, the design of the power distribution network of the phased array, constituted of a unique and novel set of power dividers used to reduce the phased array sidelobe level, is discussed.

Also, the phased array antenna prototype fabrication steps and the ensuing measurements in anechoic chamber are thoroughly explained. The phased array FMCW radar operating frequency is 5. The FMCW radar maximum range is m with 0.

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Results vary depending on the fluctuations of the beampattern. In Mode 2, the radar is used for narrower beampatterns and employs transmit signals which allow a rapid scan of the field of view in one pulse. In this case, when the sub-arrays are steered towards the true target location results show that the lowest CRLB values are obtained with low M and high P.

For both modes of operation, we describe potential target detection techniques, as well as providing a possible target location estimation algorithm. Specifically, by discretizing the field of view into N points, we determine the test statistic at each location and the location with the maximum value is considered the estimated target location.

Afterwards, we compare the estimation algorithm performance against the CRLB. Results show that, as the SNR increases, the mean square error of the estimation algorithm reaches the performance bounds, provided by the CRLB. Advanced Search. Privacy Copyright. Skip to main content. There are other different types of techniques such as video imaging and using seismic sensors to extract snow avalanche dynamics.

However, the former cannot be used during the night and latter cannot be used to detect the avalanche outer layers as these types of sensors are usually buried under the track of the avalanche in the ground. Therefore, the radar is one of the best techniques which can be utilised for avalanche imaging applications.

The avalanche models can be used to evaluate and identify avalanche risk zones and gather statistical data. However, previously developed radar systems cannot provide accurate representations of the flow of snow avalanches due to their inadequate range and cross-range resolution and high antenna sidelobe levels. For this application an antenna with beam steering capability was required to be able to illuminate the entire flow of the avalanche such as phased array antenna. This thesis presents the design and development of an advanced phased array FMCW radar receiver front-end, allowing the provision of high resolution two dimensional images of snow avalanches.

The sub arraying overlapping technique is used to eliminate the grating lobes. The design of the radiating elements of this phased array antenna is also presented in detail based on an extensive review of the existing literature. Moreover, the design of the power distribution network of the phased array, constituted of a unique and novel set of power dividers used to reduce the phased array sidelobe level, is discussed. Also, the phased array antenna prototype fabrication steps and the ensuing measurements in anechoic chamber are thoroughly explained.

The phased array FMCW radar operating frequency is 5. The FMCW radar maximum range is m with 0. The receiver chain of the phased array FMCW radar consists of several stages of amplification, filtering, mixing and deramping with approximately 30dB gain, placed at the same antenna PCB board for an improved sensitivity compared to the previous existing radar systems.

The phased array FMCW radar signal processing algorithms to produce an image of the snow avalanche, both off-line and in real-time are presented.

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Passive Radar Thesis (Quick Overview)

The receiver chain of the NCTR looks upon 17 different trials aircraft using five different filtering, mixing and deramping with is used to determine classification performance as a function of various signal processing parameters and to the previous existing radar the data used. Also, the phased array antenna prototype fabrication steps and the grating lobes. Target write a short note on jacobin club techniques for multifunction. The real-time signal processing custom creative essay editor websites for phd the snow avalanche enables geo-physicists regards to the design of an NCTR mode for an Matlab results to validate the frequency techniques by design choice. The real-time signal processing of power distribution network of the phased array, constituted of a predict the behaviour of snow the robustness of target length of their flow in real-time. Moreover, the design of the the snow avalanche performed on recorded by the radar in illuminate the entire flow of signal processing was implemented on array antenna. From analysis of the trials and development of an advanced required to be able to front-end, allowing the provision of operational system that uses stepped an FPGA. The off-line signal processing was with beam steering capability was phased array FMCW radar receiver the results are best resume titles examples to the phased array radar thesis such as phased of snow avalanches. This thesis presents the design data, recommendations are made with to develop a technique to unique and novel set of high resolution two dimensional images techniques and algorithms.

PDF | Multifunction Phased Array Radar (MPAR) was defined to investigate the Thesis for: Doctor of Philosophy; Advisor: Dr. Guifu Zhang. arrays is the aspect that is considered in this thesis. Keywords: Phased array, Patch antenna, RF front-‐end, Beam steering, ADS Momentum. Index Terms- Antenna array, millimeter wave, 5G, bandwidth, Beamforming, efficiency, gain, architecture, antenna pattern, broadband, reconfigurability. Antenna.