GNSS抗干擾接收機(jī)前端的設(shè)計(jì)與實(shí)現(xiàn)
[Abstract]:(Global Navigation Satellite System, (Global Satellite Navigation system) is more and more widely used in civil and military fields. However, the satellite navigation signal is weak and vulnerable to various unintentional or intentional electromagnetic interference. Antenna array and RF channel are at the front end of the anti-jamming receiver. The performance of this part affects the effect of anti-jamming algorithm to a great extent. In this paper, the performance of various array antennas is simulated by software to guide the design of hardware system, and the RF front-end circuit of anti-jamming receiver is designed and implemented. Firstly, this paper summarizes the research status of anti-jamming technology of satellite navigation at home and abroad, introduces the application background and research direction of this design. In this paper, the principle, advantages and disadvantages of frequency domain, space domain and space-time anti-jamming are studied, which adaptive criterion should be chosen for anti-jamming algorithm is deduced, and the algorithm of power inversion in spatial domain is studied emphatically. The principle is deduced and the frame of anti-jamming receiver system is designed. In the aspect of array antenna design, the common receiving model of array antenna is established, and the effect of array element spacing and number of array elements on the performance of antenna array is studied by theoretical derivation and software simulation. Through the study of the distance between the elements, the optimal performance of the array is obtained when the array elements are uniformly distributed at half wavelength. The performance of common array antennas such as uniform linear array and uniform circular array is studied by simulation. The planar circular array with the center of the circle is chosen as the layout of the array antenna of the receiver. By comparing common antenna performance, microstrip antenna is selected as array element. In the aspect of RF module circuit design, the performance index, complexity, power consumption and cost of RF front-end structure of three kinds of receivers are analyzed and compared, and the system requirement of anti-jamming receiver is combined. Finally, the design scheme of low intermediate frequency structure is adopted. The channel gain, noise coefficient, dynamic range, impedance matching and so on, which need to be considered in the RF front-end design of anti-jamming receiver, are studied in detail. According to the above research, the key components of RF front end, such as low noise amplifier, frequency synthesizer, mixer and so on, are designed in detail. The low noise amplifier of the RF front-end adopts two-stage cascade to provide sufficient gain and reduce the noise coefficient, while ensuring no saturation distortion and third-order Intermodulation distortion. An automatic gain control module with a large dynamic range is used to ensure that the power of the low intermediate frequency signal input to the back-end ADC not only meets the sensitivity requirements of signal processing, but also does not cause saturation distortion. Considering the problem of signal integrity in RF module, impedance matching circuit and necessary filter circuit are added to each module of RF front-end. Finally, every part of the system is tested in detail, and the test results are analyzed. The joint test results show that the designed hardware can meet the requirements of the front end of the anti-jamming receiver.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN965.5
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