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Study on Key Techniques of Distributed Spaceborne SAR Hardware-in-the-loop Simulation

Author: HeZhiHua
Tutor: LiangDianNong
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Distributed Satellite SAR Phase synchronization Time Synchronization Channel consistency Echo simulation fast algorithm High Performance Computing Dual-channel echo signal simulator Real-time correction Semi-physical simulation Error Tracing Test and Evaluation
CLC: TN958
Type: PhD thesis
Year: 2011
Downloads: 167
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Abstract


Distributed satellite synthetic aperture radar (SAR) is the spaceborne SAR satellite formation and technology combine new institutional space-based radar system that can get more than a simple networking SAR more features and higher performance, all-weather , all-time, high efficiency, high precision seamless access to global three-dimensional digital ground elevation information (DEM) of the preferred means to become a research hotspot at home and abroad. However, as the key technology of multi-system, system integration testing complex, with each error source close coupling relationship exists between only by all-digital simulation has been unable to fully meet the integration of distributed satellite SAR system verification requirements, and the use of distributed satellite SAR Loop simulation technology is an effective way to solve this problem. This paper aimed at semi-physical simulation of distributed satellite SAR forefront of this urgent issue, focusing on \The specific content of each chapter is organized as follows: Chapter II study of distributed satellite SAR signal level, phase and time synchronization collaborative methods, and the synchronization error signal error model and its impact on InSAR performance. Analysis of phase synchronization error on InSAR performance; establish a direct wave and two-way exchange of both pulse synchronization signal based on the phase synchronization method to pass compensation phase signal model, comparative analysis of the characteristics of various types of residual phase error and magnitude; studied the ping-pong bistatic mode phase synchronization method is proposed in echo processing directly related to the domain using the phase synchronization processing methods; study the time synchronization error on the interference swath loss InSAR bistatic SAR imaging and altimetry effects; studied tame high stability crystal oscillator based on GPS time synchronization method; establish a channel frequency-domain model and the interference signal amplitude and phase model to study the channel coherence interferometric phase error on the impact of bias and standard deviation. Chapter III study of distributed satellite SAR precision digital echo signal efficient simulation method. A distributed digital satellite SAR echo signal high accuracy and fast simulation algorithm, the echo signal transmitted signal expressed as the convolution of the modulated signal with the scene, the use of sampling techniques to ensure that the echo signal l simulation accuracy, the modulated signal through the scene down sampling to ensure that the sampling frequency radar echo semi-physical simulation process can be implemented in real time on the simulator, the algorithm has a model of wide applicability, echo simulation of high precision, the advantage of high computational efficiency echo; echo simulation calculation proposed concept can be used for quantitative assessment of the performance and hardware echo simulation algorithm computing power; studied based on temporal decomposition parallel echo method based on high performance computing GPU-accelerated HPC echo method. Chapter IV for distributed satellite SAR semi-physical simulation validation requirements, the completion of a two-channel echo signal simulator design and implementation. Done echo simulator overall design, complete RF subsystem, IF subsystem, the digital processing section and display control software design and implementation, and ultimately complete echo simulator developed; propose a simulator based on the relevant windowing precision amplitude and phase estimation method can effectively suppress noise and spurious data loop effects; studied complex coefficient FIR filter design and optimization methods, according to the estimate of the amplitude and phase characteristics of the design of complex FIR filter coefficients; complete the complex coefficient FIR filter FPGA real-time implementation. Tested echo simulator mode and channel amplitude and phase characteristics of the echo simulator reaches the indicator. Chapter V of the distributed satellite SAR phase, time synchronization and channel consistency error loop simulation and evaluation. Given semi-physical simulation system digital simulation system architecture and physical simulation system components; proposes a semi-physical analysis based on data error characteristics extraction methods; propose a solution based on different devices connected semi-isolation and physical errors traceable test assessment methods, the design of distributed satellite SAR phase synchronization error loop validation tests, tests to obtain phase synchronization error on the impact of interference altimeter to verify bidirectional switching pulse phase synchronization method engineering feasibility; design of distributed satellite SAR Time synchronization error loop verification test, the test to get time synchronization error on the impact of interference altimetry verified tame high stability frequency GPS-based time synchronization source engineering feasibility; design of distributed satellite SAR channel consistency error loop verification test, the test to get the channel coherence interferometry measurement error on the influence of high.

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