CN105553915A - Demodulation method for intermittent radiation signal transient modulation parameter - Google Patents
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Abstract
本发明公开了间歇辐射信号瞬态调制参量解调方法包括：步骤一、对所述间歇辐射信号进行微波混频得到中频信号，进行微波检波得到时域信号；步骤二、对所述时域信号实时采样，并进行脉冲信号分析，获取脉冲参量；步骤三、对所述中频信号实时采样，对采样得到的脉内信号分时提取，对获取的时隙信号依次进行一级解调、二级解调、匹配滤波。
The invention discloses a method for demodulating transient modulation parameters of an intermittent radiation signal, comprising: step 1, performing microwave mixing on the intermittent radiation signal to obtain an intermediate frequency signal, and performing microwave detection to obtain a time-domain signal; step 2, performing microwave detection on the time-domain signal Real-time sampling and pulse signal analysis to obtain pulse parameters; step 3, real-time sampling of the intermediate frequency signal, time-division extraction of the sampled intra-pulse signal, and sequentially performing primary demodulation and secondary demodulation of the acquired time slot signal demodulation, matched filtering.
Description
技术领域 technical field
本发明涉及无线电电子学领域，特别涉及间歇辐射信号瞬态调制参量解调方法。 The invention relates to the field of radio electronics, in particular to a method for demodulating transient modulation parameters of intermittent radiation signals.
背景技术 Background technique
随着导弹导引头技术的发展，导弹寻的制导信号应用逐渐从连续波制导转变为脉冲间歇辐射制导，导弹电子制导系统日趋复杂，导弹的攻击目标也从单一目标向多目标的技术转化。特别是在高强度干扰空域背景下，要求导弹制导武器系统具备抗干扰、目标识别、多目标跟踪和制导能力，因此，雷达制导信号采用了间歇辐射制导方式，发送携带编码调制信息的制导信号，使得武器系统抗干扰、多目标攻击等战术性能大大提高。但同时，制导信号的复杂程度也达到了相当高的程度，尤其是复杂的、瞬态变化的、复合调制信号。对于雷达发射的制导信号的调制参数技术特性及其准确度一直以来都是设计师十分关注的问题，但在校准测试手段上没有获得有效解决。 With the development of missile seeker technology, the application of missile homing guidance signal has gradually changed from continuous wave guidance to pulse intermittent radiation guidance, the electronic guidance system of missiles has become increasingly complex, and the attack target of missiles has also changed from single target to multi-target technology. Especially in the context of high-intensity interference airspace, the missile-guided weapon system is required to have anti-jamming, target recognition, multi-target tracking and guidance capabilities. Therefore, the radar guidance signal adopts the intermittent radiation guidance method to send guidance signals carrying coded modulation information. The tactical performance of the weapon system such as anti-jamming and multi-target attack is greatly improved. But at the same time, the complexity of guidance signals has reached a fairly high level, especially complex, transiently changing, and composite modulation signals. The technical characteristics and accuracy of the modulation parameters of the guidance signal emitted by the radar have always been a matter of great concern to designers, but they have not been effectively resolved in the calibration and testing methods.
发明内容 Contents of the invention
本发明解决的问题是现有技术中雷达发射的制导信号的参数调制精度低；为解决所述问题，本发明提供一种间歇辐射信号瞬态调制参量解调方法。 The problem solved by the invention is that the parameter modulation precision of the guidance signal emitted by the radar in the prior art is low; in order to solve the problem, the invention provides a method for demodulating the transient modulation parameter of the intermittent radiation signal.
本发明提供的间歇辐射信号瞬态调制参量解调方法包括： The method for demodulating transient modulation parameters of intermittent radiation signals provided by the present invention includes:
步骤一、对所述间歇辐射信号进行微波混频得到中频信号，进行微波检波得到时域信号； Step 1, performing microwave mixing on the intermittent radiation signal to obtain an intermediate frequency signal, and performing microwave detection to obtain a time domain signal;
步骤二、对所述时域信号实时采样，并进行脉冲信号分析，获取脉冲参量； Step 2, sampling the time-domain signal in real time, and performing pulse signal analysis to obtain pulse parameters;
步骤三、对所述中频信号实时采样，对采样得到的脉内信号分时提取，对获取的时隙信号依次进行一级解调、二级解调、匹配滤波。 Step 3: Sampling the intermediate frequency signal in real time, extracting the sampled intrapulse signal in time division, and performing primary demodulation, secondary demodulation, and matched filtering on the acquired time slot signal in sequence.
进一步，对采样得到的脉内信号分时提取包括以脉内信号波形特征1个单位的时间间隔对脉内信号的数据进行分割。 Further, the time-division extraction of the sampled intra-pulse signal includes dividing the data of the intra-pulse signal at a time interval of one unit of the waveform characteristic of the intra-pulse signal.
进一步，所述一级解调包括设定相应带宽的滤波，获得混合时域调制信号和一级调制的调制指数。 Further, the first-order demodulation includes filtering for setting a corresponding bandwidth to obtain the modulation index of the mixed time-domain modulation signal and the first-order modulation.
进一步，对所述混合时域调制信号进行解调，获得混合时域信号和二级调制的调制指数。 Further, the mixed time domain modulated signal is demodulated to obtain the mixed time domain signal and the modulation index of the secondary modulation.
进一步，根据所述混合时域调制信号和混合时域信号的调制频率的频带区间，设定两个带通滤波器，对混合时域信号进行匹配滤波，得到混合时域信号中携带的两个调制频率。 Further, according to the frequency band interval of the mixed time-domain modulation signal and the modulation frequency of the mixed time-domain signal, two bandpass filters are set, and the mixed time-domain signal is matched and filtered to obtain two band-pass filters carried in the mixed time-domain signal. modulation frequency.
本发明的优点包括： Advantages of the present invention include:
从调制参量的基本特性出发，将制导信号携带的调制信息进行分时提取、逐级解调，实现了对间歇辐射制导信号的调制特性的准确定标和校准，解决此类调制信号的校准问题。 Starting from the basic characteristics of the modulation parameters, the modulation information carried by the guidance signal is extracted in time division and demodulated step by step, realizing the accurate calibration and calibration of the modulation characteristics of the intermittent radiation guidance signal, and solving the calibration problem of such modulation signals .
附图说明 Description of drawings
图1为本发明实施例提供的间歇辐射信号瞬态调制参量解调方法的流程示意图； FIG. 1 is a schematic flowchart of a method for demodulating transient modulation parameters of intermittent radiation signals according to an embodiment of the present invention;
图2为本发明实施例提供的间歇辐射信号瞬态调制参量解调方法的一级解调的流程示意图； Fig. 2 is a schematic flow chart of the first-stage demodulation of the transient modulation parameter demodulation method of the intermittent radiation signal provided by the embodiment of the present invention;
图3为本发明实施例提供的间歇辐射信号瞬态调制参量解调方法的二级解调的流程示意图； Fig. 3 is a schematic flow chart of the secondary demodulation of the transient modulation parameter demodulation method for the intermittent radiation signal provided by the embodiment of the present invention;
图4为本发明实施例提供的间歇辐射信号瞬态调制参量解调方法的匹配滤波示意图。 FIG. 4 is a schematic diagram of a matched filter of a method for demodulating transient modulation parameters of an intermittent radiation signal according to an embodiment of the present invention.
具体实施方式 detailed description
下文中，结合附图和实施例对本发明作进一步阐述。 Hereinafter, the present invention will be further described in conjunction with the accompanying drawings and embodiments.
本发明提供的间歇辐射信号瞬态调制参量解调方法包括： The method for demodulating transient modulation parameters of intermittent radiation signals provided by the present invention includes:
步骤一、对所述间歇辐射信号进行微波混频得到中频信号，进行微波检波得到时域信号； Step 1, performing microwave mixing on the intermittent radiation signal to obtain an intermediate frequency signal, and performing microwave detection to obtain a time domain signal;
步骤二、对所述时域信号实时采样，并进行脉冲信号分析，获取脉冲参量； Step 2, sampling the time-domain signal in real time, and performing pulse signal analysis to obtain pulse parameters;
步骤三、对所述中频信号实时采样，对采样得到的脉内信号分时提取，对获取的时隙信号依次进行一级解调、二级解调、匹配滤波。 Step 3: Sampling the intermediate frequency signal in real time, extracting the sampled intrapulse signal in time division, and performing primary demodulation, secondary demodulation, and matched filtering on the acquired time slot signal in sequence.
具体地，由高速采集模块分别对获得的时域信号和中频信号进行时域实时采样，其中时域信号作为中频信号采样的同步触发；然后，时域信号采样获得的一组信号数据信息，进行脉冲信号的解调，解调时可采用对脉冲参量的分析方式，获取脉冲周期、脉冲宽度、上升时间等信息，中频信号实时采样获得的一组信号数据信息，由于制导信号在脉内的时域变化，使得每个发送时隙内的信号是瞬态变化的，因此，需要对每个发送的时隙进行信号的分时提取，获取每一个时隙内的信号数据；接着，分析间歇辐射信号的脉内调制模型，对提取获得的每一个时隙的信号数据，进行软件模型的解调处理；由于间歇辐射信号的脉内信号是一个复杂的多级复合调制信号，需要对其进行逐级的解调处理，每一级解调分析后，都可以获得相应调制方式下的调制频率和调制指数，最终，通过多级解调处理，能够获得整个间歇辐射信号瞬态调制参量的特性数据，实现信号的解调分析。在本实施例中，以两级解调为例，进行示意性说明。 Specifically, the high-speed acquisition module performs time-domain real-time sampling on the obtained time-domain signal and intermediate frequency signal, wherein the time-domain signal is used as a synchronous trigger for sampling the intermediate-frequency signal; then, a set of signal data information obtained by sampling the time-domain signal is processed For the demodulation of pulse signals, the analysis method of pulse parameters can be used to obtain information such as pulse period, pulse width, rise time, etc., and a set of signal data information obtained by real-time sampling of intermediate frequency signals. The domain changes, so that the signal in each transmission time slot changes transiently. Therefore, it is necessary to perform time-division extraction of the signal for each transmission time slot to obtain the signal data in each time slot; then, analyze the intermittent radiation The intra-pulse modulation model of the signal performs the demodulation processing of the software model on the extracted signal data of each time slot; since the intra-pulse signal of the intermittent radiation signal is a complex multi-level composite modulation signal, it needs to be processed step by step. After each level of demodulation processing, the modulation frequency and modulation index under the corresponding modulation mode can be obtained. Finally, through multi-level demodulation processing, the characteristic data of the transient modulation parameters of the entire intermittent radiation signal can be obtained. , to realize the demodulation analysis of the signal. In this embodiment, two-stage demodulation is taken as an example for schematic illustration.
对脉内信号分时提取包括：将中频信号实时采样之后，从显示的波形信息上可以认为是按照时间分布的时域信号，从采集到的数据量上可以认为是按照时间分布的数据信息；接着，根据时间分布一致性的原则，对采集到的中频信号数据信息进行时隙分割，以信号波形特征1个单位的时间间隔对脉内信号的数据进行分割，可以获得一系列的时隙信号，该时隙信号是以时间分布的波形特征信息。 The time-division extraction of the intrapulse signal includes: after real-time sampling of the intermediate frequency signal, the displayed waveform information can be considered as a time-domain signal distributed according to time, and the collected data can be regarded as data information distributed according to time; Then, according to the principle of time distribution consistency, the collected intermediate frequency signal data information is divided into time slots, and the data of the intrapulse signal is divided by the time interval of 1 unit of signal waveform characteristics, and a series of time slot signals can be obtained , the time slot signal is the characteristic information of the time-distributed waveform.
一级解调包括：对于时隙信号的数据信息，使用软件无线电技术，对该信号进行解调相，解调中设定相应带宽的滤波，从而获得混合时域调制信号。在解调过程中，利用解调理论可以得到一级调制的调制指数（即调相指数等）。二级解调包括：经过一级解调获得的混合时域调制信号，再次使用软件无线电技术，对该信号进行解调幅，从而获得混合时域信号。在解调过程中，利用解调理论可以得到一级调制的调制指数（即调幅度等）。 The first-level demodulation includes: for the data information of the time slot signal, use the software radio technology to demodulate the signal, and set the corresponding bandwidth filter in the demodulation, so as to obtain the mixed time-domain modulation signal. In the demodulation process, the modulation index (ie phase modulation index, etc.) of the primary modulation can be obtained by using the demodulation theory. The second-level demodulation includes: using the software radio technology to demodulate the amplitude of the mixed time-domain modulated signal obtained after the first-level demodulation, so as to obtain the mixed time-domain signal. In the demodulation process, the modulation index (ie modulation amplitude, etc.) of the primary modulation can be obtained by using the demodulation theory.
匹配滤波包括：经过二级解调获得的混合时域信号，是混合了两个携带不同调制频率的调制信号。因此，根据两个调制频率的频带区间，利用软件无线电技术，设定两个带通滤波器，对混合时域信号进行匹配滤波，即可通过滤波获得混合时域信号中携带的两个调制频率。 Matched filtering includes: a mixed time-domain signal obtained through secondary demodulation, which is a mixture of two modulated signals carrying different modulation frequencies. Therefore, according to the frequency band interval of the two modulation frequencies, using software radio technology, set two band-pass filters, and perform matched filtering on the mixed time-domain signal, and the two modulation frequencies carried in the mixed time-domain signal can be obtained by filtering .
本发明虽然已以较佳实施例公开如上，但其并不是用来限定本发明，任何本领域技术人员在不脱离本发明的精神和范围内，都可以利用上述揭示的方法和技术内容对本发明技术方案做出可能的变动和修改，因此，凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化及修饰，均属于本发明技术方案的保护范围。 Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the methods disclosed above and technical content to analyze the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made in the technical solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention, which do not depart from the content of the technical solution of the present invention, all belong to the technical solution of the present invention. protected range.
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