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IF GPS signal simulator development and verification.

机译：中频GPS信号模拟器的开发和验证。

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A software-based intermediate frequency (IF) GPS signal simulator for the L1 C/A code signal is developed and verified in this thesis. The signal simulator is implemented in MATLAB with some key functions coded in C to accelerate speed of operation. A mathematical signal model is developed that expresses the digitized IF GPS signal as a function of various errors during propagation, such as satellite clock error, ionosphere error, and troposphere error; and user defined parameters, such as date and GPS time, user trajectory, expected C/N0, noise density, intermediate frequency, sampling rate, front-end bandwidth, and quantization bit. The simulator is verified by comparing the simulated signal with the hardware-collected IF GPS signal in the time, frequency, correlation and position domains.; Partially for the simulator verification purpose, a software GPS receiver was developed and verified, which was used to process the simulated signal to get the pseudorange and carrier phase measurements. The signal acquisition and tracking techniques originally studied and verified in this thesis were used for the first generation software receiver developed by the PLAN group of the Department of Geomatics Engineering. The receiver consists of the following modules: signal acquisition, signal tracking, bit synchronization, sub-frame synchronization and the navigation solution. It is verified by using a set of real GPS signal measurements collected by a commercial hardware front-end and comparing the tracking results and navigation solution with the corresponding results of a hardware GPS receiver.
机译：本文开发并验证了用于L1 C / A代码信号的基于软件的中频（IF）GPS信号模拟器。信号模拟器是在MATLAB中实现的，其中一些关键功能用C编码，可以加快操作速度。建立了数学信号模型，该数字信号模型将数字化IF GPS信号表示为传播过程中各种误差的函数，例如卫星时钟误差，电离层误差和对流层误差；用户定义的参数，例如日期和GPS时间，用户轨迹，预期的C / N0，噪声密度，中频，采样率，前端带宽和量化位。通过在时域，频域，相关域和位置域中将仿真信号与硬件收集的IF GPS信号进行比较来验证仿真器。部分出于模拟器验证的目的，开发并验证了软件GPS接收器，该软件用于处理仿真信号以获得伪距和载波相位测量值。本文最初研究和验证的信号采集和跟踪技术被用于地理工程学院PLAN小组开发的第一代软件接收机。接收机包括以下模块：信号采集，信号跟踪，位同步，子帧同步和导航解决方案。通过使用一组由商业硬件前端收集的真实GPS信号测量值，并将跟踪结果和导航解决方案与硬件GPS接收器的相应结果进行比较，可以对它进行验证。

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