Study On Key Techniques Of The Analog Signal Channel In High Performance Satellite Navigation Receiver

High performance satellite navigation receiver is one of the important systemicequipments in satellite navigation systems, which usually requires accurate rangingmeasurement and large dynamic range. Analog signal channel is one of the necessaryparts of navigation receivers, its amplitude response and phase response have becomethe bottlenecks which made ranging measurement difficult to reach sub-nanosecondaccuracy, and its dynamic range has great influence on the performance of anti-jammingreceivers. This dissertation takes the construction of the Chinese Compass satellitenavigation system as the application background, and is based on some advanced topicssuch as accuracy ranging measurement of navigation receiver, frequency plan andanti-jamming large dynamic range design, four aspects of the study on analog signalchannel in high performance satellite navigation receivers will be carried out:(1) Most analytical methods of PN ranging measurement and carrier phase rangingmeasurement assume that the hL(t), the channel equivalent lowpass filter, is an idealmodel or some special model, which makes it difficult to meet the design requirementof the actual high performance navigation receivers. This paper extends hL(t) to anycomplex function, and investigates the formula of PN ranging measurement ofBPSK/QPSK signal which is estimated by coherent/non-coherent Early-Late estimatorand the formula of carrier phase ranging measurement of BPSK/QPSK signal which isestimated by multiplier/arctangent estimator; and gives out the expression of the optimalfilter for carrier phase ranging measurement of BPSK/QPSK signal when usedarctangent estimation. The validity of this method has been proved by analytical andsimulation results. The model in the dissertation is obviously better than the classicalanalytical models, which can be used as the reference for the optimal design of thereceiver channel.(2) Zero value has direct impact on the measurement bias in receivers, but there isa lack of general model to analyze the impact of any channel characteristics on the zerovalue measurement. Based on the hL(t) mentioned above, the impact on the PN zerovalue and carrier phase zero value of BPSK/QPSK signal, caused by the filter'samplitude response and group delay, is studied in this dissertation respectively; thisdissertation extends above methods to the occasion with time and frequency domainanti-jamming, explains the phenomena that interfere with different bandwidth andcenter frequency bring on different PN zero value and carrier phase zero value ofBPSK/QPSK signal; the dissertation also discusses the delay calibration technique,presented the sufficient condition which guarantees the validity of the calibration andit's shortage. The maximal error between the theoretical results and simulation results isless than 0.2 ns, which proves the accuracy of the model. (3) Along with the modernization of various satellite navigation systems, thefrequency plan has been restricted increasingly. According to the characteristic ofnavigation receivers, this dissertation considers the performance of receiver, as well asthe realization complexity of hardware and software, improves the general method offrequency plan for BPSK/QPSK signal navigation receivers, studys the general methodof frequency plan for BOC signal navigation receivers, which can direct the navigationreceiver design. This dissertation also establishes the analysis model for I/Q amplitudeand phase error when hL(t) is non-ideal, works out the formula of ranging measurementand zero value of BPSK/QPSK signal caused by the I/Q amplitude and phase error, thetheoretic result agrees quiet well with the simulation results in the software receiver,which proves the feasibility of analog quadrate down conversion in high performancereceivers.(4) To meet the requirement of the"Navigation Warfare", a large dynamic range isrequired in the analog channel design of the anti-jamming receivers. This dissertationsets up the ordinary model of analog signal channel, takes the given noise figuretolerance as the restriction, and points out the simple and convenient way to optimizethe dynamic range of analog channel as well as the gain plan for each stage; thisdissertation points out that the essence of the dynamic range optimizing is the process tosolve the point of intersection of a set of curves, reveals the relationship betweendynamic range and each circuit parameters, and presents a clear way to the optimaldesign of dynamic range.At last, the research work in this thesis and its engineering application aresummarized , the further work for next step is also presented. The results of the researchhave been already used in many projects of Chinese Compass satellite navigationsystem.