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Research and Implement on the Key Techniques of Rf in Satellite Navigation Terminal

Author: LiPengPeng
Tutor: OuGang
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Navigation terminal RF front-end Group delay compensation Early-late code estimation Amplitude equalizer
CLC: TN965.3
Type: Master's thesis
Year: 2009
Downloads: 65
Quote: 3
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Abstract


RF circuit is an important part of the navigation terminal , the satellite navigation and positioning system , and passive location , the signal processing circuit of the weak RF satellite signals directly collected , the weak signal received by the RF front-end is amplified downconverting processing; active positioning purposes , the RF front end is necessary to increase the conversion and signal amplification on link used to Star communicate . Many of the key indicators of the navigation terminal are directly related to the performance of the RF front-end . And group delay characteristics of the RF channel to improve the two key points of the article focuses on active and passive navigation terminal RF front-end hardware . In this paper, a national engineering models project background, in-depth study of the key technologies of the RF circuit 's overall design and engineering to achieve , and to improve the accuracy of passive receivers ranging focused RF channel delay characteristics and compensation Technical realization . First , frequency planning , the upconversion program and downconversion program analysis and implementation point of study and the completion of the hardware implementation of the RF channel RF implementation of a number of key technologies for the solution of some problems in the practical work , summed up : High both stability of the reference clock frequency to achieve a threshold level under zero error rate on the power requirements , and reception and transmission in the shared local oscillator premise isolation , transmit power and band harmonic clutter suppression and miniaturized to achieve the critical technology, etc. , and are discussed in electromagnetic compatibility and anti-jamming technically . On this basis , for the high-precision the receiver zero value measurement problem , in order to effectively improve ranging accuracy , in-depth study of group delay characteristics of the RF , all-pass group delay compensation and the amplitude equalization techniques to complete certain critical delay compensation impact analysis of the factors that ultimately achieve delay compensation effectively improve the RF channel passband group delay characteristics . Finally , the actual receiver platform experiments the influence of fluctuations in the RF channel, group delay ranging performance , analyzed under the conditions of the group delay fluctuation estimator the accuracy of the coherent early-late code , and eventually through the RF channel and its the hardware implementation of the delay compensation effectively improve ranging accuracy .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio navigation > Navigation equipment, navigation station > Sending device and timer
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