頻域抗干擾算法在GNSS高精度測量型接收機(jī)中的應(yīng)用
[Abstract]:At present, there are four independent satellite navigation systems around the world, collectively known as the Global Navigation Satellite system (GNSS), the BeiDou Satellite Navigation system of China, which was completed and put into operation at the end of 2012. Multiple satellite navigation systems increase the number of observable satellites, as well as the number of observable frequency points. The combined application of multi-system is an effective means to improve the position accuracy and reliability. Satellite navigation system can provide navigation, timing, measurement and other application modes, and its high-precision measurement mode is more and more widely used. However, there are more electromagnetic interference in the actual working environment, the most common is narrowband interference. Frequency domain interference suppression technology is simple to implement and is often used to eliminate narrowband interference signals. In this paper, the frequency domain anti-jamming algorithm scheme of threshold detection method is selected and applied to the GNSS high-precision measuring receiver. The effectiveness of the selected scheme is verified by two methods of simulation test and physical test. In this paper, the principle of anti-jamming algorithm in frequency domain is studied firstly, and the structure of overlapping synthesis algorithm, the characteristic of window function, the algorithm of time-frequency domain transform and so on are analyzed, and the N-sigma algorithm is analyzed. The simplified interference suppression algorithms are compared and the parameters of the selected frequency domain anti-interference algorithm are given. Through simulation, the correlation between signal and interference is analyzed, and different interference signals, such as continuous wave, sweep wave, narrow band noise and so on, are generated. The input signal is composed of satellite signal, Gaussian white noise and interference signal. The frequency domain anti-interference algorithm is used to filter the interference, and the signal correlation change after filtering interference is analyzed. Then the tracking loop model is established to filter and track the input signals with different interference forms, and the pseudo-code tracking phase errors and carrier phase tracking errors are counted, and the different interference conditions are analyzed. The variation of measurement accuracy of two kinds of loops. Finally, the frequency-domain anti-jamming algorithm is implemented in the GNSS high-precision measurement receiver, and the concrete solution to the practical problem of resource limitation and high power consumption encountered in the design is given. The anti-interference test of the receiver is carried out, and the zero-baseline measurement method is used to suppress different types of interference signals at a fixed level, and the influence on the pseudo-range and carrier distance measurement accuracy of the receiver is analyzed. The test results show that the frequency-domain anti-jamming algorithm can suppress the different types of interference signals at a fixed level, but the measurement accuracy of the measurement receiver and the baseline solution result will be affected to some extent. Under the test conditions, the affected test results still meet the accuracy requirements, so the selected frequency domain anti-interference scheme can be applied to GNSS high-precision measurement receiver.
【學(xué)位授予單位】:清華大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN967.1
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