This paper proposes a desirable method to detect different kinds of low probability of intercept (LPI) radar signals, targeted at the main intra-pulse modulation method of LPI radar signals including the signals of li...This paper proposes a desirable method to detect different kinds of low probability of intercept (LPI) radar signals, targeted at the main intra-pulse modulation method of LPI radar signals including the signals of linear frequency modulation, phase code, and frequency code. Firstly, it improves the coherent integration of LPI radar signals by adding the periodicity of the ambiguity function. Then, it develops a frequency domain detection method based on fast Fourier transform (FFT) and segmented autocorrelation function to detect signals without features of linear frequency modulation by virtue of the distribution characteristics of noise signals in the frequency domain. Finally, this paper gives a verification of the performance of the method for different signal-to-noise ratios by conducting simulation experiments, and compares the method with existing ones. Additionally, this method is characterized by the straightforward calculation and high real-time performance, which is conducive to better detecting all kinds of LPI radar signals.展开更多
为了提高量子数字信号表示的灵活性,本文提出了一种新的基于补码浮点表示的一维有限长度量子数字信号表示模型(Complement Floating-point Representation of Digital Signals,CFRDS)。该模型使用两组量子比特序列分别表示位置信息与幅...为了提高量子数字信号表示的灵活性,本文提出了一种新的基于补码浮点表示的一维有限长度量子数字信号表示模型(Complement Floating-point Representation of Digital Signals,CFRDS)。该模型使用两组量子比特序列分别表示位置信息与幅值信息。其中,位置信息采用有符号定点整数补码形式表示,保证了信号位置的精确性和负数处理能力;幅值信息则采用浮点数形式表示,浮点数的阶码和尾数均采用补码形式,能够更灵活地应对不同幅值的信号,确保在极端数值条件下依然保持高精度,同时,这种表示方法也简化了数学运算,能够处理更广泛的信号类型。该模型不仅在信号幅值的表示范围与精度上取得了显著提升,还在数学运算的便捷性方面展现了优越性,使得各种信号处理算法更加高效和可靠,适用于更加复杂的信号处理算法,提高了信号处理的效率。本文提出了CFRDS模型,设计了该模型的量子制备线路与基于该模型的量子数字信号基本运算线路,包括两个量子数字信号的序列加法、序列乘法以及自相关函数序列运算,并深入分析了线路复杂度,最后通过计算机仿真实验验证了所提出方案的可行性和有效性。展开更多
基金supported by the National Natural Science Foundation of China(61571462)Weapons and Equipment Exploration Research Project(7131464)
文摘This paper proposes a desirable method to detect different kinds of low probability of intercept (LPI) radar signals, targeted at the main intra-pulse modulation method of LPI radar signals including the signals of linear frequency modulation, phase code, and frequency code. Firstly, it improves the coherent integration of LPI radar signals by adding the periodicity of the ambiguity function. Then, it develops a frequency domain detection method based on fast Fourier transform (FFT) and segmented autocorrelation function to detect signals without features of linear frequency modulation by virtue of the distribution characteristics of noise signals in the frequency domain. Finally, this paper gives a verification of the performance of the method for different signal-to-noise ratios by conducting simulation experiments, and compares the method with existing ones. Additionally, this method is characterized by the straightforward calculation and high real-time performance, which is conducive to better detecting all kinds of LPI radar signals.
文摘为了提高量子数字信号表示的灵活性,本文提出了一种新的基于补码浮点表示的一维有限长度量子数字信号表示模型(Complement Floating-point Representation of Digital Signals,CFRDS)。该模型使用两组量子比特序列分别表示位置信息与幅值信息。其中,位置信息采用有符号定点整数补码形式表示,保证了信号位置的精确性和负数处理能力;幅值信息则采用浮点数形式表示,浮点数的阶码和尾数均采用补码形式,能够更灵活地应对不同幅值的信号,确保在极端数值条件下依然保持高精度,同时,这种表示方法也简化了数学运算,能够处理更广泛的信号类型。该模型不仅在信号幅值的表示范围与精度上取得了显著提升,还在数学运算的便捷性方面展现了优越性,使得各种信号处理算法更加高效和可靠,适用于更加复杂的信号处理算法,提高了信号处理的效率。本文提出了CFRDS模型,设计了该模型的量子制备线路与基于该模型的量子数字信号基本运算线路,包括两个量子数字信号的序列加法、序列乘法以及自相关函数序列运算,并深入分析了线路复杂度,最后通过计算机仿真实验验证了所提出方案的可行性和有效性。
