A Method of Segmentation Recognition of Large Time Width Signal Based on DSP
A signal and original signal technology, applied in the field of identification of radar signal modulation types, can solve the problems of long DSP processing time and the influence of signal processing time without considering the signal duration, so as to reduce the data length and ensure real-time and accuracy Effect
Active Publication Date: 2020-01-31
HARBIN ENG UNIV
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[0003] Judging from the current literature on radar signal modulation methods, most studies have not considered the influence of signal duration on signal processing time; many radar signal intra-pulse modulation identification methods implemented in engineering practice also use The recognition method based on DSP (Digital Signal Processor), and the length of the signal data affects the DSP processing time, the longer the signal data length, the longer the DSP processing time, so the research on the large time width signal recognition based on DSP necessary
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[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] The present invention uses the sampling frequency f through the analog-to-digital converter NYQ For the collected original signal data x(n), firstly, according to the length of the original signal data, the signal is intercepted into M segments. Convert to the complex domain to form M-segment complex signals; then, the M-segment complex signal data are fast Fourier transformed to obtain the amplitude spectrum of the signal, and the amplitude spectrum of the M-segment signal is integrated to obtain the 3dB bandwidth of the signal; after that, the M-segment signal data is obtained The time-frequency information of the signal; finally, the spectrum of the M-segment signal data and the time-frequency characteristics of the signal are analyzed to obtain the modulation method of the original signal data x(n).
[0017] The applicable conditions of the present inventio...
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The invention belongs to the field of radar signal modulation type identification, and particularly relates to a DSP-based large time-width signal segmented identification implementation method. The system according to the method comprises the following four modules: 1 an original signal data segmented interception module; 2 a segmented digital orthogonal frequency mixing, filtering and extraction module; 3 a frequency spectrum and time frequency characteristic segmented calculation module; and 4 an integrated discrimination module. Duration of signal processing performed on the DSP depends on the length of signal data so that the length of the data required to be processed is reduced by using an original sampling data segmented digital frequency mixing orthogonal transformation method under the condition of guaranteeing that the signal identification effect is the same, and then the signals are identified by integrating the frequency spectrum and time frequency characteristics of each segment of the signal data so that the real-time performance and the accuracy of signal processing can be guaranteed by the processing method.
Description
technical field [0001] The invention belongs to the field of recognition of radar signal modulation types, and in particular relates to a method for segment recognition of large time-width signals based on DSP. Background technique [0002] In the electronic reconnaissance system, there are often signals with a particularly large pulse width, that is, a signal with a large time width. Sampling this kind of signal will generate massive data, and the longer the length of the signal data, the longer the signal processing time, so the data processing will cause a heavy burden on the system, and the effect of real-time processing cannot be achieved. Aiming at this problem, a method of segmented signal data processing and comprehensive identification of intrapulse modulation characteristics is proposed in engineering practice [0003] Judging from the current literature on radar signal modulation methods, most studies have not considered the influence of signal duration on signal...
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IPC IPC(8): G01S7/02
CPCG01S7/021
Inventor 刘鲁涛戴亮军陈涛郭立民
Owner HARBIN ENG UNIV