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Research on the Acquisition and Tracking Technology of INS-aided GPS Receiver

Author: YuHaiLiang
Tutor: HuXiaoPing
School: National University of Defense Science and Technology
Course: Control Science and Engineering
Keywords: Software GPS receiver Optimal loop bandwidth INS -assisted capture INS -Aided Tracking
CLC: P228.4
Type: Master's thesis
Year: 2007
Downloads: 488
Quote: 8
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Abstract


The low signal-to-noise ratio and high dynamic environment impact of GPS (Global Positioning System) receiver to successfully capture and tracking are two major factors. In order to improve the receiver acquisition and tracking performance in low signal-to-noise ratio and high dynamic environment, the INS (Inertial Navigation System)-based assisted GPS receiver capture and tracking technology, from both theoretical and practical aspects of the depth research. The research work includes the following aspects: (1) analysis of the main factors affecting the acquisition performance: frequency estimation error and code phase estimation error, coherent accumulated time as well as a single decision algorithm and multiple decision algorithm. Doppler frequency of the signal acquisition time becomes longer for high dynamic movement to improve the signal acquisition performance in low signal-to-noise ratio environments increase the coherent integration time and multiple decision algorithm strategy: using INS auxiliary receiver capture The method of weakening the carrier phase for satellite motion to generate Doppler frequency, effectively reducing the cold start of the receiver, the average acquisition time for warm start and hot restart, to improve the capture performance. 2 analysis and selection of a code adapted to the low SNR environment delay locked loop (Delay Lock Loops from DLLs) discriminator (lead less hysteresis discriminator) and carrier PLL (Phase Lock loops PLLs) discriminator ( two as arctangent discriminator): Based on the optimal closed-loop transfer function, the design of the second-and third-order tracking loop digital loop filter parameters; receiver tracking bad error sources (thermal noise error, oscillator stability error and The dynamic stress error) analysis shows that: error and dynamic stress of the thermal noise error is the main error of the receiver, and they are on the loop bandwidth requirements are contradictory. In order to meet the requirements of high dynamic conditions, and minimize the impact of thermal noise, design the optimum loop bandwidth of the receiver carrier tracking loop. In order to further weaken the impact of the high dynamic due to the Doppler frequency tracking loop bandwidth is reduced at the same time, improve the anti-jamming method using INS auxiliary carrier ring, design the INS auxiliary carrier ring structure, INS auxiliary minimum loop bandwidth of the carrier ring. 3. Receiver based on INS aided acquisition and tracking experimental verification using static data and dynamic simulation data. Static experimental results show that: the design of the capture and tracking loop based on the GPS receiver software to be able to meet the requirements of the capture and tracking signals; in low SNR environments, the use of the method may increase the the coherent acquisition time and reduce the bandwidth of the tracking loop respectively capture and tracking performance of the receiver: the design of optimum loop bandwidth of the tracking loop is feasible. High Dynamic Simulation results show that: the third-order tracking loop and the second-order INS assisted tracking loop to meet the acceleration of 10g, jerk 10g / s high dynamic requirements; the INS assisted third-order loop can meet the acceleration of 100g jerk 100g / s high dynamic requirements.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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