CN101977091A - Method and system for monitoring electromagnetic spectrum - Google Patents
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Abstract
本发明公开了一种电磁频谱监测方法及系统,所述方法包括:获取中频接收机输出的时域信号;将所述时域信号转换为频域信号;计算所述频域信号循环谱的各特征截面;利用信号转换结果和/或计算得到的循环谱的各特征截面进行电磁频谱监测。利用本发明,可以完全在频域实现电磁频谱监测处理,并能够简单、有效地应用在传感器节点上。
The invention discloses a method and system for monitoring electromagnetic spectrum. The method includes: acquiring a time-domain signal output by an intermediate frequency receiver; converting the time-domain signal into a frequency-domain signal; Characteristic cross-section: use the signal conversion result and/or the calculated characteristic cross-section of the cyclic spectrum to monitor the electromagnetic spectrum. With the invention, the electromagnetic spectrum monitoring process can be completely realized in the frequency domain, and can be applied to sensor nodes simply and effectively.
Description
技术领域technical field
本发明涉及电磁频谱监测技术领域,具体涉及一种电磁频谱监测方法及系统。The invention relates to the technical field of electromagnetic spectrum monitoring, in particular to an electromagnetic spectrum monitoring method and system.
背景技术Background technique
随着电子技术的不断发展和进步,无线电业务的应用领域迅速扩大,各种移动通信、卫星通信、广播电视、雷达导航、遥测遥控、射电天文等应用遍及国防、公共安全、商用和工业等各个部门,其业务量在日益增大。无线电业务的迅猛发展对无线电频谱的管理和监测提出了新的挑战和更高要求。With the continuous development and progress of electronic technology, the application field of radio business has expanded rapidly, and various mobile communications, satellite communications, radio and television, radar navigation, telemetry and remote control, radio astronomy and other applications have spread throughout national defense, public safety, commercial and industrial fields. sector, whose volume of business is increasing day by day. The rapid development of radio services has brought new challenges and higher requirements to the management and monitoring of radio spectrum.
电磁频谱监测是指对空间中的无线电信号进行监控普查,它主要包括信号检测、调制方式识别和参数估计三个主要环节,即首先检测监测频段内信号的有无和数量,在有信号的情况下识别出信号的调制方式,并估计信号的载频、带宽、波特率等参数。Electromagnetic spectrum monitoring refers to the monitoring and general survey of radio signals in space. It mainly includes three main links: signal detection, modulation mode identification and parameter estimation. Identify the modulation mode of the signal, and estimate the carrier frequency, bandwidth, baud rate and other parameters of the signal.
目前,面向电磁传感网应用的电磁频谱监测系统主要是依靠多个可任意布设的小型传感器节点以协同的方式来完成对一定区域内的电磁信号监测,其监测节点体积较小,能量有限,因而其处理能力也有限,这就对电磁频谱监测的处理方法提出了更高的要求,即处理算法必须简便、快速,所需的存储和处理能力都比较小等。At present, the electromagnetic spectrum monitoring system for electromagnetic sensor network applications mainly relies on a number of small sensor nodes that can be arranged arbitrarily to complete the monitoring of electromagnetic signals in a certain area in a coordinated manner. The monitoring nodes are small in size and limited in energy. Therefore, its processing capacity is also limited, which puts forward higher requirements for the processing method of electromagnetic spectrum monitoring, that is, the processing algorithm must be simple and fast, and the required storage and processing capabilities are relatively small.
在现有技术中,电磁频谱监测采用的方法主要有时域、时频域混合两大类。其中:时域方法需要存储大量的时域信号,给节点的存储和处理能力带来很大的压力,且时域方法大多都比较复杂,不适于在能量有限的小型传感器节点上实现;时频域混合使用的电磁频谱监测方法一般是利用频域方法进行信号检测,利用时域方法和频域方法相结合的思路进行参数估计和调制方式识别等,这种方案一方面需要存储时域信号样本,另一方面在处理过程中需要时频域数据的来回转换,实现方案复杂,不利于算法的进一步开发加载,因此也不适合在传感器节点上实现。In the prior art, the methods adopted for electromagnetic spectrum monitoring mainly fall into two categories: time domain and time-frequency domain hybrid. Among them: the time-domain method needs to store a large number of time-domain signals, which puts great pressure on the storage and processing capabilities of the nodes, and most of the time-domain methods are relatively complicated, which is not suitable for small sensor nodes with limited energy; time-frequency The electromagnetic spectrum monitoring method used in the mixed domain generally uses the frequency domain method for signal detection, and uses the idea of combining the time domain method and the frequency domain method for parameter estimation and modulation identification. On the one hand, this solution needs to store time domain signal samples , on the other hand, the back and forth conversion of time-frequency domain data is required in the processing process, and the implementation scheme is complicated, which is not conducive to the further development and loading of the algorithm, so it is not suitable for implementation on sensor nodes.
发明内容Contents of the invention
本发明实施例提供一种电磁频谱监测方法及系统,以完全在频域内实现电磁频谱监测处理,简单、有效地在应用在传感器节点上。Embodiments of the present invention provide an electromagnetic spectrum monitoring method and system to completely implement electromagnetic spectrum monitoring and processing in the frequency domain, and be applied to sensor nodes simply and effectively.
为此,本发明实施例提供如下技术方案:For this reason, the embodiment of the present invention provides following technical scheme:
一种电磁频谱监测方法,包括:An electromagnetic spectrum monitoring method, comprising:
获取中频接收机输出的时域信号;Obtain the time-domain signal output by the intermediate frequency receiver;
将所述时域信号转换为频域信号;converting the time domain signal to a frequency domain signal;
计算所述频域信号循环谱的各特征截面;calculating each characteristic section of the cyclic spectrum of the frequency domain signal;
利用信号转换结果和/或计算得到的循环谱的各特征截面进行电磁频谱监测。The electromagnetic spectrum monitoring is performed by using the signal conversion result and/or the calculated characteristic sections of the cyclic spectrum.
优选地,所述将所述时域信号转换为频域信号包括:Preferably, said converting said time-domain signal into a frequency-domain signal comprises:
利用快速傅里叶变换将所述时域信号转换为频域信号。The time domain signal is converted into a frequency domain signal using a fast Fourier transform.
可选地,所述利用信号转换结果和/或计算得到的循环谱的各特征截面进行电磁频谱监测包括以下任意一项或多项:Optionally, the electromagnetic spectrum monitoring using the signal conversion result and/or the calculated characteristic sections of the cyclic spectrum includes any one or more of the following:
利用信号转换结果或其循环谱的各特征截面进行信号检测;Use the signal conversion result or each characteristic section of its cyclic spectrum to perform signal detection;
利用转换的频域信号和其循环谱的各特征截面识别信号调制方式;Use the converted frequency domain signal and each characteristic section of its cyclic spectrum to identify the signal modulation mode;
利用信号循环谱的各特征截面进行信号参数估计。The signal parameters are estimated by using each characteristic section of the signal cycle spectrum.
可选地,所述利用信号转换结果或其循环谱的各特征截面进行信号检测包括:Optionally, the signal detection using the signal conversion result or each characteristic section of its cyclic spectrum includes:
对信号转换结果进行功率检测;或者performing power detection on the signal conversion result; or
提取所述循环谱的频率为0的α截面谱峰位置信息进行检测。The peak position information of the α-section spectrum whose frequency is 0 of the cyclic spectrum is extracted for detection.
优选地,所述利用转换的频域信号和其循环谱的各特征截面识别信号调制方式包括:Preferably, the identification of the modulation mode of the signal by using the converted frequency domain signal and each characteristic section of its cyclic spectrum includes:
提取信号循环谱的各特征截面的特征来区分不同调制类型的信号。The features of each characteristic section of the signal cycle spectrum are extracted to distinguish signals of different modulation types.
优选地,所述利用信号循环谱的各特征截面进行信号参数估计包括以下任意一项或多项:Preferably, the signal parameter estimation using each characteristic section of the signal cycle spectrum includes any one or more of the following:
提取信号循环谱特征截面中包含信号载频信息的谱峰位置信息,利用该谱峰位置信息计算得到信号的载频;Extracting the spectral peak position information containing the signal carrier frequency information in the characteristic section of the signal cycle spectrum, and using the spectral peak position information to calculate the carrier frequency of the signal;
提取信号循环谱特征截面中包含信号波特率信息的次峰位置信息,利用该次峰位置信息计算得到信号的波特率。The sub-peak position information containing the signal baud rate information in the characteristic section of the signal cycle spectrum is extracted, and the baud rate of the signal is calculated by using the sub-peak position information.
一种电磁频谱监测全频域的系统,包括:A system for monitoring the full frequency domain of the electromagnetic spectrum, comprising:
信号获取单元,用于获取中频接收机输出的时域信号;a signal acquisition unit, configured to acquire a time-domain signal output by the intermediate frequency receiver;
信号转换单元,用于将所述时域信号转换为频域信号;a signal converting unit, configured to convert the time-domain signal into a frequency-domain signal;
计算单元,用于计算所述频域信号循环谱的各特征截面;a calculation unit, configured to calculate each characteristic section of the cyclic spectrum of the frequency-domain signal;
监测单元,用于利用信号转换结果和/或计算得到的循环谱的各特征截面进行电磁频谱监测。The monitoring unit is used to monitor the electromagnetic spectrum by using the signal conversion result and/or the calculated characteristic sections of the cyclic spectrum.
可选地,所述监测单元包括以下任意一个或多个子单元:Optionally, the monitoring unit includes any one or more of the following subunits:
信号检测子单元,用于利用信号转换结果或其循环谱的各特征截面进行信号检测;The signal detection subunit is used to perform signal detection by using the signal conversion result or each characteristic section of its cyclic spectrum;
调制方式识别子单元,用于利用转换的频域信号及其循环谱的各特征截面识别信号调制方式;The modulation mode identification subunit is used to identify the signal modulation mode by using the converted frequency domain signal and each characteristic section of its cyclic spectrum;
参数估计子单元,用于利用信号循环谱的各特征截面进行信号参数估计。The parameter estimation subunit is used for estimating signal parameters by using each characteristic section of the signal cycle spectrum.
可选地,所述信号检测子单元包括:Optionally, the signal detection subunit includes:
第一检测子单元,用于对信号转换结果进行功率检测;或者The first detection subunit is used to perform power detection on the signal conversion result; or
第二检测子单元,用于提取所述循环谱的频率为0的α截面谱峰位置信息进行检测。The second detection subunit is used to extract the peak position information of the α-section spectrum whose frequency is 0 in the cyclic spectrum for detection.
优选地,所述调制方式识别子单元,具体用于提取信号循环谱的各特征截面的特征来区分不同调制类型的信号。Preferably, the modulation mode identification subunit is specifically configured to extract features of each characteristic section of the signal cycle spectrum to distinguish signals of different modulation types.
可选地,所述参数估计子单元包括以下任意一个或多个子单元:Optionally, the parameter estimation subunit includes any one or more of the following subunits:
载频估计子单元,用于提取信号循环谱特征截面中包含信号载频信息的谱峰位置信息,并利用该谱峰位置信息计算得到信号的载频;The carrier frequency estimation subunit is used to extract the spectral peak position information containing the signal carrier frequency information in the characteristic section of the signal cycle spectrum, and use the spectral peak position information to calculate the carrier frequency of the signal;
波特率估计子单元,用于提取信号循环谱特征截面中包含信号波特率信息的次峰位置信息,并利用该次峰位置信息计算得到信号的波特率。The baud rate estimation subunit is used to extract the position information of the secondary peak containing the baud rate information of the signal in the characteristic section of the signal cycle spectrum, and use the position information of the secondary peak to calculate the baud rate of the signal.
本发明实施例电磁频谱监测方法及系统,针对电磁传感网应用的需求,利用信号离散傅立叶变换(DFT)结果和循环谱结果,完全基于信号频域信息来完成信号检测、参数估计、调制方式识别等电磁频谱监测任务。无需存储大量的时域信号样本,也无需时频域信号的来回转换,大大简化了电磁频谱监测的实现复杂度,也易于进行硬件实现,同时还能够保证较灵活的算法可加载性,可以较好地应用在传感器节点上,实现面向电磁传感网的电磁频谱监测。The electromagnetic spectrum monitoring method and system of the embodiment of the present invention, aiming at the requirements of electromagnetic sensor network applications, uses the signal discrete Fourier transform (DFT) results and cyclic spectrum results to complete signal detection, parameter estimation, and modulation methods based entirely on signal frequency domain information Electromagnetic spectrum monitoring tasks such as identification. It does not need to store a large number of time-domain signal samples, nor does it need to convert time-frequency domain signals back and forth, which greatly simplifies the implementation complexity of electromagnetic spectrum monitoring, and is also easy to implement in hardware. It is well applied to sensor nodes to realize electromagnetic spectrum monitoring for electromagnetic sensor networks.
附图说明Description of drawings
为了更清楚地说明本申请实施例或现有技术中的技术方案,下面将对实施例中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明中记载的一些实施例,对于本领域普通技术人员来讲,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the embodiments. Obviously, the accompanying drawings in the following description are only described in the present invention For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings.
图1是本发明实施例电磁频谱监测方法的流程图;Fig. 1 is the flowchart of the electromagnetic spectrum monitoring method of the embodiment of the present invention;
图2是本发明实施例电磁频谱监测方法的一个具体应用示意图;Fig. 2 is a specific application schematic diagram of the electromagnetic spectrum monitoring method of the embodiment of the present invention;
图3是本发明实施例电磁频谱监测系统的结构示意图。Fig. 3 is a schematic structural diagram of an electromagnetic spectrum monitoring system according to an embodiment of the present invention.
具体实施方式Detailed ways
为了使本技术领域的人员更好地理解本发明实施例的方案,下面结合附图和实施方式对本发明实施例作进一步的详细说明。In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.
如图1所示,是本发明实施例电磁频谱监测方法的流程图,包括以下步骤:As shown in Figure 1, it is a flow chart of the electromagnetic spectrum monitoring method of the embodiment of the present invention, including the following steps:
步骤101,获取中频接收机输出的时域信号。
假定中频接收机接收的信号已经完成模数转换、下变频、下抽取和预处理等步骤,经过这些处理后的信号是一个具有更低频率和更低抽样速率的带通数字信号。其中:It is assumed that the signal received by the IF receiver has completed steps such as analog-to-digital conversion, down-conversion, down-decimation, and preprocessing, and the signal after these processes is a band-pass digital signal with a lower frequency and a lower sampling rate. in:
模数转换是指将模拟信号转换为数字信号;Analog-to-digital conversion refers to the conversion of analog signals into digital signals;
下变频处理是指将具有一定频率的输入信号,转换成具有更低频率的输出信号,通常不改变信号的信息内容和调制方式的过程;Down-conversion processing refers to the process of converting an input signal with a certain frequency into an output signal with a lower frequency, usually without changing the information content and modulation mode of the signal;
下抽取处理是指以更低的速率对信号重新采样的过程;Down-decimation refers to the process of resampling a signal at a lower rate;
预处理主要完成信号的分离及带宽、载频等的粗估计。Preprocessing mainly completes signal separation and rough estimation of bandwidth and carrier frequency.
上述这些处理也是现有技术中电磁频谱监测通常需要经历的处理步骤,具体各处理过程在此不再一一详细描述。The above-mentioned processing is also the processing steps that electromagnetic spectrum monitoring usually needs to go through in the prior art, and the specific processing processes will not be described in detail here.
步骤102,将所述时域信号转换为频域信号。
具体地,假设中频接收机输出的时域信号为x(n),可以利用快速傅里叶变换算法(FFT)计算信号x(n)的DFT结果X(k)。Specifically, assuming that the time-domain signal output by the intermediate frequency receiver is x(n), the DFT result X(k) of the signal x(n) can be calculated using a Fast Fourier Transform algorithm (FFT).
步骤103,计算所述频域信号循环谱的各特征截面
通常,将统计特性呈周期或多周期平稳变化的信号统称为循环平稳或周期平稳信号,循环谱理论是研究分析周期平稳信号的主要方法。Generally, the signals whose statistical properties change steadily in periods or multiperiods are collectively referred to as cyclostationary or cyclostationary signals, and cyclic spectrum theory is the main method for studying and analyzing cyclostationary signals.
循环谱密度函数表示信号x(t)在频率f+α/2和f-α/2处的谱分量的相关密度,其中,f是经典傅氏频谱中的频率,α是循环频率变量。循环谱特征截面是指固定f所对应的α截面,或者是固定α所对应的f截面。Cyclic Spectral Density Function Represents the correlation density of the spectral components of a signal x(t) at frequencies f+α/2 and f-α/2, where f is the frequency in the classical Fourier spectrum and α is the cyclic frequency variable. The characteristic section of the cyclic spectrum refers to the α section corresponding to a fixed f, or the f section corresponding to a fixed α.
比如,可以计算得到信号循环谱f=0的α截面信号循环谱f=fc的α截面等。For example, the α-section of the signal cycle spectrum f=0 can be calculated The α-section of the signal cycle spectrum f=f c wait.
步骤104,利用信号转换结果和/或计算得到的循环谱的各特征截面进行电磁频谱监测。
可以进行的电磁频谱监测主要有以下任意一种或多种:The electromagnetic spectrum monitoring that can be carried out mainly includes any one or more of the following:
利用信号转换结果或其循环谱的各特征截面进行信号检测;Use the signal conversion result or each characteristic section of its cyclic spectrum to perform signal detection;
利用转换的频域信号和其循环谱的各特征截面识别信号调制方式;Use the converted frequency domain signal and each characteristic section of its cyclic spectrum to identify the signal modulation mode;
利用信号循环谱的各特征截面进行信号参数估计。The signal parameters are estimated by using each characteristic section of the signal cycle spectrum.
下面分别对上述各种监测进行详细说明。The various monitoring above will be described in detail below.
(1)信号检测(1) Signal detection
在本发明实施例中,可以通过多种方式实现对信号的检测。In the embodiment of the present invention, signal detection may be implemented in various ways.
比如,可以通过对信号转换结果的功率检测,完成电磁频谱监测所需的信号检测。For example, the signal detection required for electromagnetic spectrum monitoring can be completed by detecting the power of the signal conversion result.
再比如,由于噪声不具有循环平稳特性,而信号则多具有循环平稳特性,因此在噪声循环谱f=0的α截面最大值位置应该在α=0的位置,而信号则不然,因此,还可以通过提取所述循环谱的各特征截面频率为0的截面谱峰位置信息的检测,完成电磁频谱监测所需的信号检测。For another example, since the noise does not have the cyclostationary characteristic, but the signal mostly has the cyclostationary characteristic, so the position of the maximum value of the α section of the noise cyclic spectrum f=0 should be at the position of α=0, but the signal does not, therefore, also The signal detection required for electromagnetic spectrum monitoring can be completed by extracting the detection of the peak position information of each characteristic cross-section of the cyclic spectrum whose cross-section frequency is 0.
(2)识别信号调制方式(2) Identify the signal modulation method
在本发明实施例中,可以识别的信号类型包括ASK(Amplitude Shift Keying,幅移键控)、FSK(Frequency-shift keying,频移键控)、MSK(最小移频键控)、BPSK(Binary Phase Shift Keying,二相相移键控)、QPSK(Quadrature Phase Shift Keying四相相移键控)、8PSK(8 Phase Shift Keying,8移相键控)、QAM(Quadrature Amplitude Modulation,正交振幅调制)等多种常用的数字调制类型。In the embodiment of the present invention, the identifiable signal types include ASK (Amplitude Shift Keying, amplitude shift keying), FSK (Frequency-shift keying, frequency shift keying), MSK (minimum frequency shift keying), BPSK (Binary Phase Shift Keying, binary phase shift keying), QPSK (Quadrature Phase Shift Keying quadrature phase shift keying), 8PSK (8 Phase Shift Keying, 8 phase shift keying), QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation ) and many other commonly used digital modulation types.
由于不同信号在循环谱特征截面上表现出不同特点,因此可以通过提取信号循环谱特征截面的特征来区分不同调制类型的信号。如MSK信号循环谱在f=0的α截面有两根明显的谱峰,而2ASK信号则只有一根谱峰,那么通过提取该截面谱峰个数信息就可以完成MSK和2ASK信号的识别。Since different signals exhibit different characteristics on the characteristic section of the cyclic spectrum, the signals of different modulation types can be distinguished by extracting the characteristics of the characteristic section of the cyclic spectrum of the signal. For example, there are two obvious spectral peaks in the α-section of the MSK signal cyclic spectrum at f=0, while the 2ASK signal has only one spectral peak, then the identification of MSK and 2ASK signals can be completed by extracting the information of the number of spectral peaks in this section.
(3)信号参数估计(3) Signal parameter estimation
由于信号循环谱的f=fc的α截面中次峰位置包含波特率信息,而f=0的α截面谱峰位置包含信号载频信息,因此可以通过提取相应截面的谱峰位置和/或次峰位置信息来进行信号参数估计。比如:Since the secondary peak position in the α section of f=f c of the signal cycle spectrum contains baud rate information, and the α section spectrum peak position of f=0 contains signal carrier frequency information, it can be obtained by extracting the spectral peak position and/or or secondary peak position information for signal parameter estimation. for example:
可以提取信号循环谱特征截面中包含信号载频信息的谱峰位置信息,利用该谱峰位置信息计算得到信号的载频;The spectral peak position information containing the signal carrier frequency information in the characteristic section of the signal cycle spectrum can be extracted, and the carrier frequency of the signal can be calculated by using the spectral peak position information;
提取信号循环谱特征截面中包含信号波特率信息的次峰位置信息,利用该次峰位置信息计算得到信号的波特率;Extracting the sub-peak position information containing the signal baud rate information in the characteristic section of the signal cycle spectrum, and using the sub-peak position information to calculate the baud rate of the signal;
当然,本发明实施例中可估计的信号参数不仅限于上述载频、波特率,还可以进行其他参数估计,比如扩频参数等,在此不再一一列举。Of course, the signal parameters that can be estimated in the embodiment of the present invention are not limited to the above-mentioned carrier frequency and baud rate, and other parameters can also be estimated, such as spreading parameters, etc., which will not be listed here.
可见,本发明实施例电磁频谱监测方法,针对电磁传感网应用的需求,利用信号离散傅立叶变换(DFT)结果和循环谱结果,完全基于信号频域信息来完成信号检测、参数估计、调制方式识别等电磁频谱监测任务。无需存储大量的时域信号样本,也无需时频域信号的来回转换,大大简化了电磁频谱监测的实现复杂度。FFT作为DFT的快速实现算法,也易于进行硬件实现,同时还能够保证较灵活的算法可加载性,可以较好地应用在传感器节点上,实现面向电磁传感网的电磁频谱监测。It can be seen that the electromagnetic spectrum monitoring method in the embodiment of the present invention is aimed at the requirements of electromagnetic sensor network applications, using the signal discrete Fourier transform (DFT) results and cyclic spectrum results to complete signal detection, parameter estimation, and modulation methods based entirely on signal frequency domain information Electromagnetic spectrum monitoring tasks such as identification. There is no need to store a large number of time-domain signal samples, and there is no need to convert time-frequency domain signals back and forth, which greatly simplifies the implementation complexity of electromagnetic spectrum monitoring. As a fast implementation algorithm of DFT, FFT is also easy to implement in hardware. At the same time, it can ensure a more flexible algorithm loadability, and can be better applied to sensor nodes to realize electromagnetic spectrum monitoring for electromagnetic sensor networks.
本发明实施例电磁频谱监测方法,主要利用信号的DFT结果和循环谱结果来实现。采用循环谱方法可以带来以下两个方面的好处:一方面由于循环谱特征截面包含丰富的信息,包括信号载频、波特率、带宽、调制方式特征等,为调制识别和参数估计提供了很大的便利,比如信号载频所对应的循环谱特征截面包含有信号的波特率信息及扩频参数信息,f=0的循环谱特征截面则包含了信号载频、检测信号有无的特征和进行调制识别的很多特征;另一方面循环谱作为一种更加全面的信号分析工具利用信号的循环谱特征可以完成大多数调制类型,如ASK、FSK、MSK、BPSK、QPSK、8PSK、QAM等通信信号的调制识别与参数估计。The electromagnetic spectrum monitoring method in the embodiment of the present invention is mainly realized by using the DFT result and the cyclic spectrum result of the signal. The use of the cyclic spectrum method can bring the following two benefits: on the one hand, because the cyclic spectrum feature section contains rich information, including signal carrier frequency, baud rate, bandwidth, modulation mode characteristics, etc., it provides information for modulation identification and parameter estimation. Great convenience, for example, the cyclic spectrum characteristic section corresponding to the signal carrier frequency contains the signal baud rate information and spread spectrum parameter information, and the cyclic spectrum characteristic section of f=0 includes the signal carrier frequency, detection signal presence or absence Features and many features for modulation identification; on the other hand, as a more comprehensive signal analysis tool, the cyclic spectrum can use the cyclic spectrum characteristics of the signal to complete most modulation types, such as ASK, FSK, MSK, BPSK, QPSK, 8PSK, QAM Modulation identification and parameter estimation of communication signals.
如图2所示,是本发明实施例电磁频谱监测方法的一个具体应用示意图。As shown in FIG. 2 , it is a schematic diagram of a specific application of the electromagnetic spectrum monitoring method of the embodiment of the present invention.
在该示例中,包括以下步骤:In this example, the following steps are involved:
步骤201,利用快速傅里叶变换算法FFT计算信号x(n)的DFT结果;
步骤202,利用信号x(n)的DFT结果计算信号循环谱特征截面,如 等;
步骤203,利用信号x(n)的DFT结果或信号循环谱特征截面进行信号检测;
步骤204,利用信号x(n)的DFT结果、信号循环谱特征截面,进行信号调制方式识别,信号类型包括ASK、FSK、MSK、BPSK、QPSK、8PSK、QAM等多种常用的数字调制类型;
步骤205,利用信号循环谱特征截面和信号调制方式识别的结果,进行信号参数估计,估计参数包括信号的载频、带宽、波特率和扩频码参数等。
需要说明的是,图2所示示例表示的仅仅是一个具体流程,在实际应用中,电磁频谱的监测也可以只进行其中的一项或某几项监测,而不限定必须按照上述流程来处理。It should be noted that the example shown in Figure 2 represents only a specific process, and in practical applications, the monitoring of the electromagnetic spectrum can also only carry out one or some of the monitoring, and it is not limited to be processed according to the above process .
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成,所述的程序可以存储于一计算机可读取存储介质中,所述的存储介质,如:ROM/RAM、磁碟、光盘等。Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage Media, such as: ROM/RAM, disk, CD, etc.
相应地,本发明实施例还提供了一种电磁频谱监测全频域的系统,如图2所示,是该系统的一种结构示意图。Correspondingly, the embodiment of the present invention also provides a system for monitoring the full frequency domain of the electromagnetic spectrum, as shown in FIG. 2 , which is a schematic structural diagram of the system.
在该实施例中,所述系统包括:In this embodiment, the system includes:
信号获取单元301,用于获取中频接收机输出的时域信号;A
信号转换单元302,用于将所述时域信号转换为频域信号;a
计算单元303,用于计算所述频域信号循环谱的各特征截面;A
监测单元304,用于利用信号转换结果和/或计算得到的循环谱的各特征截面进行电磁频谱监测。The
其中,所述监测单元304可以包括以下任意一个或多个子单元:Wherein, the
信号检测子单元,用于利用信号转换结果或其循环谱的各特征截面进行信号检测;The signal detection subunit is used to perform signal detection by using the signal conversion result or each characteristic section of its cyclic spectrum;
调制方式识别子单元,用于利用转换的频域信号和及其循环谱的各特征截面、识别信号调制方式;The modulation mode identification subunit is used to identify the signal modulation mode by using the converted frequency domain signal and each characteristic section of its cyclic spectrum;
参数估计子单元,用于利用信号循环谱的各特征截面进行信号参数估计。The parameter estimation subunit is used for estimating signal parameters by using each characteristic section of the signal cycle spectrum.
其中,各子单元可以有多种方式实现,比如:Among them, each subunit can be realized in many ways, such as:
所述信号检测子单元包括:第一检测子单元、或者第二检测子单元。所述第一检测子单元用于对信号转换结果进行功率检测;第二检测子单元用于提取所述循环谱的频率为0的α截面谱峰位置信息进行检测。The signal detection subunit includes: a first detection subunit, or a second detection subunit. The first detection subunit is used to detect the power of the signal conversion result; the second detection subunit is used to extract the peak position information of the α-section spectrum with a frequency of 0 in the cyclic spectrum for detection.
所述调制方式识别子单元,可以通过提取信号循环谱的各特征截面的特征来区分不同调制类型的信号。The modulation mode identification subunit can distinguish signals of different modulation types by extracting features of each characteristic section of the signal cycle spectrum.
所述参数估计子单元可以包括以下任意一个或多个子单元:The parameter estimation subunit may include any one or more of the following subunits:
载频估计子单元,用于提取信号循环谱特征截面中包含信号载频信息的谱峰位置信息,并利用该谱峰位置信息计算得到信号的载频;The carrier frequency estimation subunit is used to extract the spectral peak position information containing the signal carrier frequency information in the characteristic section of the signal cycle spectrum, and use the spectral peak position information to calculate the carrier frequency of the signal;
波特率估计子单元,用于提取信号循环谱特征截面中包含信号波特率信息的次峰位置信息,并利用该次峰位置信息计算得到信号的波特率。The baud rate estimation subunit is used to extract the position information of the secondary peak containing the baud rate information of the signal in the characteristic section of the signal cycle spectrum, and use the position information of the secondary peak to calculate the baud rate of the signal.
当然,本发明实施例中,所述参数估计子单元并不仅限于上述结构,还可以包含其他参数估计子单元,利用信号循环谱特征截面,完成相应信号参数的估计,比如带宽、扩频码参数等。Of course, in the embodiment of the present invention, the parameter estimation subunit is not limited to the above-mentioned structure, and may also include other parameter estimation subunits, which use the signal cyclic spectrum characteristic section to complete the estimation of corresponding signal parameters, such as bandwidth and spreading code parameters wait.
本发明实施例电磁频谱监测系统,针对电磁传感网应用的需求,利用信号离散傅立叶变换(DFT)结果和循环谱结果,完全基于信号频域信息来完成信号检测、参数估计、调制方式识别等电磁频谱监测任务。无需存储大量的时域信号样本,也无需时频域信号的来回转换,大大简化了电磁频谱监测的实现复杂度。FFT作为DFT的快速实现算法,也易于进行硬件实现,同时还能够保证较灵活的算法可加载性,可以较好地应用在传感器节点上,实现面向电磁传感网的电磁频谱监测。The electromagnetic spectrum monitoring system of the embodiment of the present invention is aimed at the requirements of electromagnetic sensor network applications, using the signal discrete Fourier transform (DFT) results and cyclic spectrum results to complete signal detection, parameter estimation, modulation mode identification, etc. based entirely on signal frequency domain information Electromagnetic Spectrum Monitoring Mission. There is no need to store a large number of time-domain signal samples, and there is no need to convert time-frequency domain signals back and forth, which greatly simplifies the implementation complexity of electromagnetic spectrum monitoring. As a fast implementation algorithm of DFT, FFT is also easy to implement in hardware. At the same time, it can ensure a more flexible algorithm loadability, and can be better applied to sensor nodes to realize electromagnetic spectrum monitoring for electromagnetic sensor networks.
需要说明的是,对于系统实施例而言,由于其基本相似于方法实施例,所以描述得比较简单,相关之处参见方法实施例的部分说明即可。以上所描述的系统实施例仅仅是示意性的,其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性劳动的情况下,即可以理解并实施。It should be noted that, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to the part of the description of the method embodiment. The system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.
以上对本发明实施例进行了详细介绍,本文中应用了具体实施方式对本发明进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及设备;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本发明的限制。The embodiments of the present invention have been described in detail above, and the present invention has been described using specific implementation methods herein. The descriptions of the above embodiments are only used to help understand the method and equipment of the present invention; meanwhile, for those of ordinary skill in the art, According to the idea of the present invention, there will be changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.
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