基于DSP的确知信号回波检测系统设计
发布时间：2018-08-12 08:49
【摘要】：随着计算机技术和微电子技术的快速发展,信号处理技术逐渐从模拟化方式转变成数字化方式并被广泛应用于数字通信、语音和图像处理、频谱分析、信号检测和自动控制等领域。确知信号回波检测技术是人类的又一大应用,被广泛应用于生命探测,物体无损检测、目标识别与定位、军舰水下通信,飞机雷达障碍物测距和声纹识别等。因此,研究出快速、高效、精准、具有通用性的确知信号回波检测系统对生命探测,发展高新技术,国防信息安全处理具有十分重要的意义。在此背景下,本文对确知信号回波的检测方法进行研究。通过在时域和频域范围对该类确知信号回波的特点及性质进行分析,发现它们具有一些共同的特点：(1)确知信号回波幅度很小,常常被淹没在接收信号的各种杂波和背景噪声中。(2)频带易于噪声发生重叠,由于这些干扰信号的频带远比确知信号回波的频带宽易相互重叠,因此干扰信号是不能通过滤波的方法去除的。(3)确知信号回波特征己知且与参考信号存在相关性,由于将发射波作为参考信号,它的的特征是已知的；在检测端接受到的确知信号回波的特征与发射波是同一个波,只是产生了传输时延;因此参考信号与接收的确知信号回波是相关的。针对上述问题,在此基础上,利用特点(3)提出一种基于DSP的确知信号回波检测系统设计方案。它利用参考信号信号的特征是已知的,参考信号与接收的确知信号回波相关与噪声不相关这些特征。通过系统仿真发现其特点是不论回波信号的幅度大小,当接受到的确知信号回波中含有参考信号时,确知信号回波与参考信号的互相关性最大；确知信号回波检测方法实现简单,电路易集成且检验结果不受滤波器的限制；针对确知信号回波检测而言,此检测系统具有通用性；确知信号回波检测方法采用数字化方式相比于传统方式提高了相关检测的精度和可靠性,而且可以降低成本,易于升级换代。论文的研究工作主要体现在如下几个方面：其一,首先通过收集大量与确知信号回波检测相关的文献资料,对国内外确知信号回波检测技术发展现状进行了总结和分析,在研究和掌握现有理论和手段基础上,重点进行了利用数字处理手段来解决确知信号回波检测的具体实现方法。其二,根据确知信号回波与接收设备的模板信号间的信号相关性和模板信号与干扰信号无相关性这区别,探讨了以此为基础,利用DSP芯片实现确知信号相关检测算法的设计,从而解决回波信号检测设备的低成本、稳定性、灵活性、通用性问题。其三,在MATLAB环境下,对不同信噪比的雷达确知信号回波检测过程进行仿真与分析。其四,在嵌入式集成开发环境CCS5.2下,深入研究确知信号回波相关检测算法及DSP芯片的硬件开发技术和软件编程技术以及调试技巧：利用TI公司的16位定点DSP芯片TMS320VC5509APGE的硬件进行了检测系统的设计；利用汇编和C语言编写了DSP的确知信号回波相关检测算法,并在CCS上进行了调试和功能仿真；在此过程中掌握了程序开发方法、调试工具的使用、多种开发语言嵌套使用的方法以及程序的优化技巧。仿真结果证明了研究结果与系统设计的正确性,实现了功能要求和设计目标。本课题研究的确知信号回波相关检测技术的基本理论及实现方法经测试表明,实际电路的工作和测试结果基本与理论研究的相关结果相吻合,为确知信号回波检测系统的设计以及确知信号回波检测方法和相关运算功能扩展应用的实现提供参考。利用相关运算检测出在复杂背景噪声中的确知信号回波的技术,还可运用于矿难、地震灾害中生命探测,军事电子对抗、声纹识别、为军事信息安全相关领域提供了理论及技术支持,为以后从事信号处理和DSP硬件研发工作积累了经验。
[Abstract]:With the rapid development of computer technology and microelectronics technology, signal processing technology has gradually changed from analog mode to digital mode and is widely used in digital communications, speech and image processing, spectrum analysis, signal detection and automatic control and other fields. It can be used in life detection, non-destructive detection of objects, target recognition and location, underwater communication of warships, radar obstacle ranging and voiceprint recognition of aircraft, etc. Therefore, it is very important to develop a fast, efficient, accurate and universal certainty signal echo detection system for life detection, development of high-tech, national defense information security processing. Under this background, this paper studies the detection method of the ascertained signal echo. By analyzing the characteristics and properties of the echo in time domain and frequency domain, it is found that they have some common characteristics: (1) the ascertained signal echo amplitude is very small, and is often submerged in various clutters and background noises of the received signal. (2) Frequency band is liable to overlap noise, because the frequency bands of these interference signals are much easier to overlap than those of the known signal echoes, so the interference signals can not be removed by filtering the waves. (3) The characteristics of the signal echoes are known and correlated with the reference signals, because the transmitted waves are used as the reference signals, its characteristics are as follows. It is known that the characteristics of the echo received at the detection end are the same as that of the transmitted wave, and only the transmission delay is produced. Therefore, the reference signal is related to the received echo of the known signal. It takes advantage of the known characteristics of the reference signal and the uncorrelated correlation between the reference signal and the received certainty signal echo and the noise. The system simulation shows that the characteristic is that, regardless of the amplitude of the echo signal, when the received certainty signal echo contains the reference signal, the reciprocity between the signal echo and the reference signal is ascertained. The detection method of ascertained signal echo is simple to implement, the circuit is easy to integrate and the test result is not limited by the filter; for ascertained signal echo detection, this detection system is universal; ascertained signal echo detection method uses digital method to improve the accuracy and reliability of correlation detection compared with the traditional method. The research work of this paper is mainly embodied in the following aspects: firstly, by collecting a large number of documents and materials related to the detection of the known signal echo, this paper summarizes and analyzes the development status of the detection technology of the known signal echo at home and abroad, and studies and grasps the existing theory and hands. Secondly, according to the difference between the signal correlation between the echo signal and the template signal of the receiving equipment and the non-correlation between the template signal and the interference signal, this paper discusses the realization of the ascertained signal using DSP chip on the basis of this. The design of correlation detection algorithm solves the problems of low cost, stability, flexibility and versatility of echo signal detection equipment. Thirdly, under MATLAB environment, the echo detection process of radar certainty signal with different signal-to-noise ratio is simulated and analyzed. Fourthly, under embedded integrated development environment CCS5.2, the phase of certainty signal echo is studied deeply. The hardware development technology, software programming technology and debugging skills of the switch detection algorithm and DSP chip are introduced. The detection system is designed by using the hardware of the 16-bit fixed-point DSP chip TMS320VC5509APGE of TI company. The algorithm of the correlation detection of the DSP's deterministic signal echo is compiled by using assembly and C language, and debugged and simulated on CCS. The simulation results prove the correctness of the research results and the system design, and achieve the functional requirements and design goals. The basic signal echo detection technology is known in this paper. Tests show that the actual circuit work and test results are basically consistent with the results of theoretical research. It provides a reference for the design of the ascertained signal echo detection system and the realization of the detection method of ascertained signal echo and the extension of related operation functions. Acoustic echo technology can also be used in mine accidents, earthquake disasters, life detection, military electronic countermeasures, voiceprint recognition, providing theoretical and technical support for military information security related fields, for the future engaged in signal processing and DSP hardware research and development work has accumulated experience.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN911.23
本文编号：2178549
[Abstract]:With the rapid development of computer technology and microelectronics technology, signal processing technology has gradually changed from analog mode to digital mode and is widely used in digital communications, speech and image processing, spectrum analysis, signal detection and automatic control and other fields. It can be used in life detection, non-destructive detection of objects, target recognition and location, underwater communication of warships, radar obstacle ranging and voiceprint recognition of aircraft, etc. Therefore, it is very important to develop a fast, efficient, accurate and universal certainty signal echo detection system for life detection, development of high-tech, national defense information security processing. Under this background, this paper studies the detection method of the ascertained signal echo. By analyzing the characteristics and properties of the echo in time domain and frequency domain, it is found that they have some common characteristics: (1) the ascertained signal echo amplitude is very small, and is often submerged in various clutters and background noises of the received signal. (2) Frequency band is liable to overlap noise, because the frequency bands of these interference signals are much easier to overlap than those of the known signal echoes, so the interference signals can not be removed by filtering the waves. (3) The characteristics of the signal echoes are known and correlated with the reference signals, because the transmitted waves are used as the reference signals, its characteristics are as follows. It is known that the characteristics of the echo received at the detection end are the same as that of the transmitted wave, and only the transmission delay is produced. Therefore, the reference signal is related to the received echo of the known signal. It takes advantage of the known characteristics of the reference signal and the uncorrelated correlation between the reference signal and the received certainty signal echo and the noise. The system simulation shows that the characteristic is that, regardless of the amplitude of the echo signal, when the received certainty signal echo contains the reference signal, the reciprocity between the signal echo and the reference signal is ascertained. The detection method of ascertained signal echo is simple to implement, the circuit is easy to integrate and the test result is not limited by the filter; for ascertained signal echo detection, this detection system is universal; ascertained signal echo detection method uses digital method to improve the accuracy and reliability of correlation detection compared with the traditional method. The research work of this paper is mainly embodied in the following aspects: firstly, by collecting a large number of documents and materials related to the detection of the known signal echo, this paper summarizes and analyzes the development status of the detection technology of the known signal echo at home and abroad, and studies and grasps the existing theory and hands. Secondly, according to the difference between the signal correlation between the echo signal and the template signal of the receiving equipment and the non-correlation between the template signal and the interference signal, this paper discusses the realization of the ascertained signal using DSP chip on the basis of this. The design of correlation detection algorithm solves the problems of low cost, stability, flexibility and versatility of echo signal detection equipment. Thirdly, under MATLAB environment, the echo detection process of radar certainty signal with different signal-to-noise ratio is simulated and analyzed. Fourthly, under embedded integrated development environment CCS5.2, the phase of certainty signal echo is studied deeply. The hardware development technology, software programming technology and debugging skills of the switch detection algorithm and DSP chip are introduced. The detection system is designed by using the hardware of the 16-bit fixed-point DSP chip TMS320VC5509APGE of TI company. The algorithm of the correlation detection of the DSP's deterministic signal echo is compiled by using assembly and C language, and debugged and simulated on CCS. The simulation results prove the correctness of the research results and the system design, and achieve the functional requirements and design goals. The basic signal echo detection technology is known in this paper. Tests show that the actual circuit work and test results are basically consistent with the results of theoretical research. It provides a reference for the design of the ascertained signal echo detection system and the realization of the detection method of ascertained signal echo and the extension of related operation functions. Acoustic echo technology can also be used in mine accidents, earthquake disasters, life detection, military electronic countermeasures, voiceprint recognition, providing theoretical and technical support for military information security related fields, for the future engaged in signal processing and DSP hardware research and development work has accumulated experience.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN911.23
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