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Research and Exploitation for GPS Self-adaptive Anti-jamming System on Array Antennas

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Tutor: JuYongFeng
School: Chang'an University
Course: Detection Technology and Automation
Keywords: GPS,Adaptive,time-space,antenna array,DSP
CLC: TN973.3
Type: Master's thesis
Year:  2011
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Abstract:
As a general navigation device, global positioning system (GPS) is satellite-based radio navigation system and has many incomparable superiority, comparing to other navigation systems, with man-made satellite serving as it¡¯s navigation station. GPS is able to provide any corner on the earth with high-class information of position¡¢speed and time in despite of weather. Due to the weak power of arriving GPS signal and complicated electromagnetic interfere in propagation channel, effective measures must be taken to eliminate interference signals in order to advance the GPS receiver¡¯s capacity of resisting disturbance, through which the reliability and stability of navigation system can be upgraded and optimized.In the course of GPS receiver¡¯s research, self-adaptive anti-jamming technique has broad practical foundation and application perspective. In this paper, based on antenna array and GPS Anti-jamming Algorithm, GPS receiver has been endowed a more advanced capability of anti-jamming so that high-class input signal could be extract for subsequent module. This article describes the principle of adaptive anti-jamming antenna, analysis of the classic adaptive measurement and common adaptive spatial filtering algorithms, conduct an in-depth research on the DOA estimation problem used in the adaptive spatial filtering algorithm. The LCMV-based algorithms are choosed as the core algorithm of anti-jamming GPS antenna, and the capabilities of different algorithms through simulation for a different priori conditions are compared and analyzed. On the analysis of the adaptive array antenna system¡¯s basic structure, the DSP-based system solution and the method of verifying the experimental results of this program are pointed out.
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