GNSS接收机DSP信号与数据处理软件测评

发布时间：2018-02-22 23:55

本文关键词： GNSS接收机 DSP 软件测试可靠性评估　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着全球卫星导航系统(GNSS)的建设,在国民经济和国防建设中各种导航定位接收机的应用越来越广泛,功能日益丰富,设计也越来越复杂。作为GNSS的应用终端,其地位也越来越重要。目前软件接收机逐步占据了主流市场,那么对于用户来说,接收机的软件质量与可靠性至关重要的,其可靠性将直接决定整个系统是否可靠。若要保证软件的质量,测试是关键。而软件开发者往往忽略了开发过程中测试的重要性而偏重于产品的性能测试,这些测试项目都是在硬件的基础上基于整机的黑盒测试,忽略了程序的内部运行情况,未考虑到代码执行时产生的不可靠因素,这样便导致软件故障原因的查找困难并且需要付出较大代价。本文针对GNSS接收机DSP信号与数据处理软件,以可靠性评估为目的,主要进行了如下几方面工作:(1)对GNSS接收机进行详细分析,结合传统的软件测试方法,针对被测对象的设计及功能结构,制定本课题的测试策略。(2)基于MATLAB和DSP开发环境CCS建立了DSP嵌入式软件测试环境,使用CCSLink开发工具实现了MATLAB与CCS及硬件DSP的双向连接。(3)在MATLAB环境下对测试系统的GUI、信号产生、测试驱动及数据分析模块进行设计与实现,生成测试用例驱动被测软件运行并获取测试结果。(4)从单元、集成测试和可靠性评估这三个阶段分别给出了具体的测试方案,在单元测试和集成测试阶段分别阐述了测试流程和步骤,给出了基于BitMap技术的插桩点设置及路径覆盖度和误码率指标的获取方法。在可靠性评估阶段,针对高可靠性软件短期内失效数据收集困难,可靠度无法用可靠性模型拟合的问题,首次提出一种根据可靠性指标间接评估可靠性的方法,分别从测试条件、潜在威胁和异常测试的角度给出了测试指标的选取和定义,并建立模糊决策模型给出了可靠性指标间接评估模型参数的推导过程,使得评估结果的置信度在理论上得以提升。
[Abstract]:With the construction of global satellite navigation system (GNSS), the applications of various navigation and positioning receivers in the national economy and national defense are becoming more and more extensive, the functions are becoming more and more abundant, and the design is becoming more and more complicated. Its status is also becoming more and more important. At present, the software receiver has gradually occupied the mainstream market, so for users, the software quality and reliability of the receiver is very important. The reliability will directly determine the reliability of the whole system. To ensure the quality of the software, testing is the key. Software developers tend to ignore the importance of testing in the development process and focus on the performance testing of the product. These test projects are based on hardware, black-box testing, ignoring the internal operation of the program, not taking into account the unreliability of code execution, In this way, it will be difficult to find the cause of the software failure and will have to pay a large price. The purpose of this paper is to evaluate the reliability of the DSP signal and data processing software of the GNSS receiver. The main work is as follows: 1) the GNSS receiver is analyzed in detail. Combining with the traditional software testing method, the design and function structure of the object under test are discussed. Based on MATLAB and DSP development environment CCS, the embedded software testing environment of DSP is established. The bidirectional connection between MATLAB and CCS and hardware DSP is realized by using CCSLink development tool. In MATLAB environment, the gui and signal of the test system are generated. Test driver and data analysis module are designed and implemented to generate test case driven test software running and obtain test results. In the phase of unit test and integrated test, the test flow and steps are described, and the setting of the insertion point based on BitMap technology and the method of obtaining the index of path coverage and error rate are given. In view of the difficulty of collecting failure data in a short period of time and the problem that reliability can not be fitted with reliability model, a method of indirectly evaluating reliability according to reliability index is proposed for the first time. The selection and definition of test indexes are given from the angles of potential threat and abnormal testing, and the fuzzy decision model is established to derive the parameters of indirect evaluation model of reliability index, which improves the confidence of evaluation results theoretically.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5

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