IFF应答接收机设计与实现
发布时间：2018-11-02 19:29
【摘要】：随着现代战争的日益信息化发展,现代电子信息战成为战争中的重要组成部分。IFF(敌我识别)系统已经成为了现代电子战争中的不可缺少的部分。从二十世纪开始,随着远程武器在战场中使用,对己方人员的误伤就不断的出现,各个国家开始注意到敌我识别的重要性。西方国家最开始对敌我识别进行研究,从最开始的M1、M2、M3、MC模式发展到如今的M4、M5模式。而其中M5模式是目前北约使用的最新的敌我识别系统,与前几代敌我识别系统相比,它具有更好的保密性好、作用的距离更远以及更高的识别概率等优点。本文针对西方的M5模式,对M5模式中应答接收机进行研究与设计,分别在MATLAB平台以及ISE平台进行仿真并实现,本文的研究工作主要有以下几个部分:首先,本文研究了M5模式的工作原理以及相关的工作模式,分析了M5模式下的询问信号格式以及应答信号格式,同时对询问信号以及应答信号的产生流程进行了研究。对M5模式中涉及到的基带信号算法进行研究,从RS编码到Walsh扩频,再到MSK调制解调等相关算法。RS编码以及Walsh扩频的使用,使得M5模式具有更强的容错能力以及更远的识别距离,与前一代敌我识别M4模式中PSK调制方式相比,MSK调制的方式能在相同符号率的情况下占据更小的频带,提高了频谱利用率。然后,对IFF接收机进行设计仿真。针对M5模式工作方式中MSK信号是窄脉冲的情况,根据过零检测法,提出了一种基于CORDIC算法的鉴相求频解调方法,并在matlab平台与ISE平台上仿真验证;而当敌我识别器工作在数据传输模式下,利用相干解调的方法往往能够得到更好的效果,在matlab平台上对几种相干解调的方法进行仿真和性能对比,然后在ISE平台上对平方环解调方法进行了仿真与验证。最后,在对应答接收机进行大量仿真的基础上,对电路进行设计。电路中ADC芯片采用AD9265,提供80MHz的采样率。对模拟中频信号为70MHz的MSK信号进行采样得到数字信号,再经过数字下变频之后,基于CORDIC算法的鉴相求频方法,基于FPGA的平台对基带信号处理,利用非相干解调的方法对MSK信号进行解调,在信噪比为15dB的条件下,误码率接近理论值。
[Abstract]:With the development of modern war information, modern electronic information warfare has become an important part of the war,. IFF (identification) system has become an indispensable part of modern electronic warfare. Since the beginning of the twentieth century, with the use of long-range weapons in the battlefield, the accidental injury to their own personnel has been emerging, and each country has begun to pay attention to the importance of the identification of the enemy and the self. The western countries began to study the identification of foe and foe, from the initial M1M2M3M3 MC model to the present M4 / M5 model. The M5 pattern is the newest identification system used by NATO at present. Compared with the previous generation of identification system, M5 pattern has the advantages of better confidentiality, longer distance and higher recognition probability. Aiming at the western M5 mode, this paper studies and designs the answering receiver in M5 mode, and simulates and implements it on MATLAB platform and ISE platform respectively. The research work of this paper mainly includes the following parts: first, In this paper, the working principle of M5 mode and its related working modes are studied, and the format of interrogation signal and response signal in M5 mode are analyzed. At the same time, the generating process of challenge signal and response signal is studied. The base-band signal algorithms involved in M5 mode are studied, from RS coding to Walsh spread spectrum, and then to MSK modulation and demodulation algorithms. RS coding and the use of Walsh spread spectrum, The M5 mode has stronger fault-tolerant ability and longer recognition distance. Compared with the PSK modulation in the previous generation of M4 mode, the MSK modulation can occupy a smaller frequency band at the same symbol rate. The spectrum efficiency is improved. Then, the IFF receiver is designed and simulated. In view of the situation that the MSK signal is a narrow pulse in M5 mode, a phase demodulation method based on CORDIC algorithm is proposed according to the zero-crossing detection method, and simulated on matlab platform and ISE platform. When the foe / I recognizer works in the data transmission mode, the method of coherent demodulation can get better results. The simulation and performance comparison of several coherent demodulation methods are carried out on the matlab platform. Then the square loop demodulation method is simulated and verified on ISE platform. Finally, the circuit is designed based on the simulation of the transponder. In the circuit, ADC chip uses AD9265, to provide the sampling rate of 80MHz. The digital signal is obtained by sampling the MSK signal whose analog intermediate frequency signal is 70MHz. After digital downconversion, the method of phase identification and frequency finding based on CORDIC algorithm is used to process the baseband signal based on the platform of FPGA. The non-coherent demodulation method is used to demodulate the MSK signal. When the SNR is 15dB, the bit error rate is close to the theoretical value.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TJ5;TN97
本文编号：2306747
[Abstract]:With the development of modern war information, modern electronic information warfare has become an important part of the war,. IFF (identification) system has become an indispensable part of modern electronic warfare. Since the beginning of the twentieth century, with the use of long-range weapons in the battlefield, the accidental injury to their own personnel has been emerging, and each country has begun to pay attention to the importance of the identification of the enemy and the self. The western countries began to study the identification of foe and foe, from the initial M1M2M3M3 MC model to the present M4 / M5 model. The M5 pattern is the newest identification system used by NATO at present. Compared with the previous generation of identification system, M5 pattern has the advantages of better confidentiality, longer distance and higher recognition probability. Aiming at the western M5 mode, this paper studies and designs the answering receiver in M5 mode, and simulates and implements it on MATLAB platform and ISE platform respectively. The research work of this paper mainly includes the following parts: first, In this paper, the working principle of M5 mode and its related working modes are studied, and the format of interrogation signal and response signal in M5 mode are analyzed. At the same time, the generating process of challenge signal and response signal is studied. The base-band signal algorithms involved in M5 mode are studied, from RS coding to Walsh spread spectrum, and then to MSK modulation and demodulation algorithms. RS coding and the use of Walsh spread spectrum, The M5 mode has stronger fault-tolerant ability and longer recognition distance. Compared with the PSK modulation in the previous generation of M4 mode, the MSK modulation can occupy a smaller frequency band at the same symbol rate. The spectrum efficiency is improved. Then, the IFF receiver is designed and simulated. In view of the situation that the MSK signal is a narrow pulse in M5 mode, a phase demodulation method based on CORDIC algorithm is proposed according to the zero-crossing detection method, and simulated on matlab platform and ISE platform. When the foe / I recognizer works in the data transmission mode, the method of coherent demodulation can get better results. The simulation and performance comparison of several coherent demodulation methods are carried out on the matlab platform. Then the square loop demodulation method is simulated and verified on ISE platform. Finally, the circuit is designed based on the simulation of the transponder. In the circuit, ADC chip uses AD9265, to provide the sampling rate of 80MHz. The digital signal is obtained by sampling the MSK signal whose analog intermediate frequency signal is 70MHz. After digital downconversion, the method of phase identification and frequency finding based on CORDIC algorithm is used to process the baseband signal based on the platform of FPGA. The non-coherent demodulation method is used to demodulate the MSK signal. When the SNR is 15dB, the bit error rate is close to the theoretical value.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TJ5;TN97
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