| The bi/multi-static radar, which separates the transmit and receive arrays into different configurations, has shown great potential advantages in modern electronic warfare. While the collected multiple-input multiple-output(MIMO) radar, which exploits mutually orthogonal waveforms at the transmitter, has shown superiorities such as improved capability of target detection, increased performance of parameter estimation, etc. In this paper, the bistatic MIMO radar that incorporates the advantages of both types of these two radar configurations is discussed. It shows better performance and has more potentialities. Moreover, the practical application of the bistatic MIMO radar is simple due to its similar structure as that of other modern radar systems.This thesis is based on a bistatic MIMO radar experimental system with a transmit/receive-receive(T/R-R) structure. By carrying out a variety of experiments as well as conducting theoretical analyses, the works of debugging system modules,calibrating system errors, testing system function, and verifying system algorithms has been done to ensure that the system work properly with normal functions, stable states and effective control logics. A series of field tests and corresponding experiments are carried out under the guidance of reasonable outfield experiment schemes, and the characteristics of MIMO radar as well as its ability of target detection are verified. The main work of this paper is listed as follows:1. The basic principle and signal processing procedure of the bistatic MIMO radar as well as several commonly used target information extraction algorithms are introduced; The influence of non-strictly orthogonal waveforms on the performance of mono-pulse angle measurement algorithms with amplitude sum and difference comparison is also discussed, based on which a correction method that can effectively eliminate these effects is proposed.2. The logic structure, module function, working procedure, and main parameters of the experimental system are introduced, and the functional test of the waveform generating module is also completed; The separation effectiveness of the transmitted signals is verified using the measured data, and the orthogonality of the transmitted signals are also verified by these experiments.3. The signal models for the case of existing non-ideal factors including themagnitude and phase errors associated with the transmit and the receive arrays, the frequency and phase differences between two stations are established, and their effects on signal processing algorithms are analyzed; Active correcting techniques are employed to implement the amplitude-phase calibration of the transmit and the receive arrays, and the effectiveness of this calibration method is evaluated using MUSIC algorithm; The frequency difference is estimated with the aid of the moving target detection(MTD) processing method. Meanwhile, the antenna beam patterns for the experimental system are plotted, and the equivalent emission beamforming principle of MIMO radar is verified. Making use of the far-field signal acquisition and power estimation, the interception resistance performance of MIMO radar is also verified.4. In order to verify the target detection function of the experimental system,moving target detection experiments for MIMO radar are carried out in condition that reasonable experimental methods and scenarios are designed. In order to achieve better detection performance, the CLEAN algorithm is employed aiming at cancelling out the fixed clutter. Compared with the traditional moving target identification(MTI) method,it gives better performance. In addition, multi-target detection experiments are also carried out so as to verify the multi-target detection capability of MIMO radar. |
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