CN109600182A - Channelization detection method and system in satellite-borne electromagnetic spectrum monitoring - Google Patents
Channelization detection method and system in satellite-borne electromagnetic spectrum monitoring Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
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- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/15—Active relay systems
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Abstract
The invention discloses a channelization detection method and a channelization detection system in satellite-borne electromagnetic spectrum monitoring, which can extract effective signals of each sub-channel after performing channelization processing on collected signals, splice and combine the signals of each sub-channel, and finally continuously detect continuous signals through detection thresholds of each sub-channel, thereby avoiding missing detection and error detection of the collected signals and further improving the accuracy of signal detection.
Description
Technical field
This application involves the channelizings in spaceborne technical field of information processing more particularly to a kind of spaceborne electromagnetic spectrum monitoring
Detection method and system.
Background technique
With the development of space technology, during satellite is realized reception and is forwarded to spacing wave, electromagnetic spectrum monitoring
It is more important.During satellite is realized reception and is forwarded to spacing wave, if being extracted after detecting useful signal on star,
Useful signal number transfer efficiency in electromagnetic spectrum monitoring can greatly be improved.
Each sub-channel spectra and thresholding have obtained, can according in Threshold detection subchannel with the presence or absence of effective narrow band signal frequency
Spectrum.If every sub-channels individually make frequency domain detection, if there is signal is just in the position that two sub-channels overlap, channelizing can be incited somebody to action
Effective target signal is divided on two sub-channels, and the signal spectrum presented on every sub-channels can be than the frequency of entire useful signal
Bands of a spectrum width has the risk of false retrieval or missing inspection.
Summary of the invention
It is existing to solve the present invention provides the channelizing detection method and system in a kind of spaceborne electromagnetic spectrum monitoring
Effective target signal can be divided on two sub-channels by channelizing in technology, and the signal spectrum presented on every sub-channels can compare
The spectral band width of entire useful signal, there is the problem of false retrieval or risk of missing inspection.
Its specific technical solution is as follows:
A kind of channelizing detection method in spaceborne electromagnetic spectrum monitoring, which comprises
Channelizing processing is carried out to acquisition signal, obtains the corresponding time-domain signal of each sub-channels；
FFT transform is carried out to the corresponding signal of each sub-channels, obtains the corresponding frequency-region signal of each sub-channels；
According to the corresponding frequency-region signal of subchannel, the corresponding detection threshold of each sub-channels is calculated, and obtains each height letter
The corresponding detection threshold in road:
The useful signal in each sub-channels is extracted, and the useful signal is spliced on continuous frequency domain and is connected
Continuous signal to be detected；
Continuous signal to be detected is continuously detected according to the corresponding detection threshold of each sub-channels, and has been extracted
Effect has frequency point.
Optionally, continuous signal to be detected is continuously detected according to the corresponding detection threshold of each sub-channels, is wrapped
It includes:
Determine useful signal corresponding bandwidth on continuous frequency domain；
Determine the corresponding detection threshold of each bandwidth；
When continuously being detected, each bandwidth is detected using corresponding detection threshold respectively.
A kind of channelizing detection system in spaceborne electromagnetic spectrum monitoring, the system comprises:
Channelization block obtains the corresponding time-domain signal of each sub-channels for carrying out channelizing processing to acquisition signal；
It is corresponding to obtain each sub-channels for carrying out FFT transform to the corresponding signal of each sub-channels for FFT transform module
Frequency-region signal；
Threshold generation module, for calculating the corresponding detection door of each sub-channels according to the corresponding frequency-region signal of subchannel
Limit, and obtain the corresponding detection threshold of each sub-channels；
Processing module, for extracting the useful signal in each sub-channels, and by the useful signal in continuous frequency
Splicing obtains continuous signal to be detected on domain；According to the corresponding detection threshold of each sub-channels to continuous signal to be detected into
The continuous detection of row, and extract and effectively have frequency point.
Optionally, the processing module is specifically used for determining useful signal corresponding bandwidth on continuous frequency domain；It determines
The corresponding detection threshold of each bandwidth；When continuously being detected, each bandwidth is carried out using corresponding detection threshold respectively
Detection.
Channelizing detection method in a kind of provided spaceborne electromagnetic spectrum monitoring through the invention, can be to acquisition
After signal carries out channelizing processing, the useful signal of each sub-channels is extracted, and the signal of each sub-channels is spelled
Engagement simultaneously, continuously detects continuous signal finally by the detection threshold of each sub-channels, is avoided in this way to acquisition
The missing inspection of signal and false retrieval, and then improve the accuracy of signal detection.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the channelizing detection method in the embodiment of the present invention in spaceborne electromagnetic spectrum monitoring；
Fig. 2 is that the channelizing in the embodiment of the present invention in spaceborne electromagnetic spectrum monitoring detects execution flow chart；
Fig. 3 (a) is base-band signal spectrum schematic diagram in the embodiment of the present invention；
Fig. 3 (b) is each sub-channel spectra schematic diagram after channelizing in the embodiment of the present invention；
Fig. 4 is sub-channels of embodiment of the present invention spectrum diagram；
Fig. 5 is that 6 sub-channels effective spectrums merge schematic diagram in the embodiment of the present invention；
Fig. 6 is a kind of structural representation of the channelizing detection system in the embodiment of the present invention in spaceborne electromagnetic spectrum monitoring
Figure.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing and specific embodiment, it should be understood that this hair
Particular technique feature in bright embodiment and embodiment is the explanation to technical solution of the present invention, rather than is limited, not
In the case where conflict, the particular technique feature in the embodiment of the present invention and embodiment be can be combined with each other.
It is as shown in Figure 1 the process of the channelizing detection method in spaceborne electromagnetic spectrum monitoring a kind of in the embodiment of the present invention
Figure, this method comprises:
S101 carries out channelizing processing to acquisition signal, obtains the corresponding time-domain signal of each sub-channels；
S102 carries out FFT transform to the corresponding signal of each sub-channels, obtains the corresponding frequency-region signal of each sub-channels；
S103 calculates the corresponding detection threshold of each sub-channels according to the corresponding frequency-region signal of subchannel, and obtains each
The corresponding detection threshold of subchannel；
S104 extracts the useful signal in each sub-channels, and the useful signal is spliced on continuous frequency domain
Obtain continuous signal to be detected；
S105 continuously detects continuous signal to be detected according to the corresponding detection threshold of each sub-channels, and is mentioned
Taking out effectively has frequency point.
Specifically, technical solution of the present invention can be executed according to process shown in Fig. 2, be illustrated in figure 2 channelizing
The continuous detection algorithm process of frequency spectrum.Collected baseband signal is first made into channelizing processing, the signal after channelizing is divided into two-way；
Wherein signal as FFT transform obtains each sub-channel spectra all the way, and another way is used to generate the detection of each subchannel after channelizing
Thresholding；Thresholding and sub-channel spectra input subchannel are merged and continuous detection module, continuous frequency domain detection is made；It will test
Point extracts, and is mapped as corresponding frequency point；Finally narrow band signal is extracted.
Wherein, the processing method of channelizing is as follows:
Channelizing includes that mixing and filtering extraction, specific calculation are as shown in formula 1:
Yk (n)=[I (n)+jQ (n)] .e-jwn formula (1)
Baseband signal samples rate fs, bandwidth BW are inputted, signal bandwidth BW is divided into N sections by channelizing, each subchannel bandwidth
For BW/N, N number of subchannel centre frequency is moved respectively to 0 frequently by formula (1) mixing operation, I (n), Q (n) are that input is wide in formula 1
Band signal, w are the centre frequency of each subchannel, then remake D times of filtering extraction processing.
If defeated base signal sampling rate fs be 60MHz, bandwidth BW=be 36MHz (± 18MHz), signal is divided into 6 sons
Channel, filtering extraction multiple D be 8, then after channelizing each subchannel bandwidth be 6MHz, sample rate f s_sub be 7.5MHz such as
Shown in formula (2):
Fs_sub=fs/D=60/8=7.5MHz formula (2)
Shown in base-band signal spectrum schematic diagram such as Fig. 3 (a), 6 sub-channels centre frequencies of division respectively -15MHz, -
9MHz, -3MHz, 3MHz, 9MHz and 15MHz.After channelizing shown in each sub-channel spectra such as Fig. 3 (b).
The processing method of subchannel FFT transform is as follows:
The time-domain signal of 6 sub-channels is obtained after channelizing, signal frequency domain detection need to make FFT to each subchannel time-domain signal
Transformation, sets FFT length L as 32768.FFT transform obtains shown in the frequency resolution such as formula (3) of frequency spectrum, and fs_sub is son letter
Road sample rate, f_res are frequency resolution.
F_res=fs_sub/L=7.5MHz/32768=228.88Hz formula (3)
According to subchannel sample rate 7.5MHz, effective bandwidth 6MHz, FFT length 32768 can obtain each subchannel effective bandwidth
It is 26214 that corresponding frequency spectrum points, which are rounded several points, and sub-channel spectra is as shown in Figure 4.
The processing method of threshold generation is as follows:
Frequency domain detection also needs to obtain detection threshold in addition to obtaining signal spectrum.Detection threshold is obtained using adaptive threshold
Shown in method such as formula (4), yk (n) is subchannel time-domain signal, and thre_coef is threshold coefficient, and Threk is each subchannel of kth
Adaptive threshold.
Threk=thre_coef* (∑ | yk (n) | 2) formula (4)
The step of can must obtaining adaptive threshold according to formula (4) are as follows:
1, to square of the point difference modulus of 32768 time-domain signals；
2, noise power is obtained to a square summation for 32768 moulds；
Adaptive threshold can be obtained multiplied by threshold coefficient thre_coef with noise power again.
The processing method that subchannel continuously detects is as follows:
The effective spectrum of each subchannel is extracted in this method, merges these effective spectrums, remakes continuous frequency domain inspection
It surveys, just solves signal and fail to judge risk.6 sub-channels effective spectrums are merged as shown in Figure 5.
Continuous detection is made to the frequency spectrum of effective bandwidth after merging, is needed in continuous detection process according to each subchannel change detection
Thresholding.When points are less than 26214, detection threshold is switched to the thresholding of subchannel 1；Points are greater than 26214, when being less than 26214*2,
Detection threshold is switched to the thresholding of subchannel 2；Points are greater than 26214*2, and when being less than 26214*3, detection threshold is switched to sub- letter
The thresholding in road 3；Points are greater than 26214*3, and when being less than 26214*4, detection threshold is switched to the thresholding of subchannel 4；Points are greater than
26214*4, when being less than 26214*5, detection threshold is switched to the thresholding of subchannel 5；Points are greater than 26214*5, are less than 26214*6
When, detection threshold is the thresholding for being switched to subchannel 6.After detecting useful signal, position of the signal in Fig. 5 is recorded
Come, it is subsequent to remake frequency point extraction.
The processing method that frequency point extracts is as follows:
It the frequency point position detected such as has been corresponded in figure 5 above in true frequency.0-26216 point corresponds to -18MHz
~-12MHz；26214~26214*2 point corresponds to -12MHz~-6MHz；26214*2~26214*3 point correspondence -6MHz~-
0MHz；26214*3~26214*4 point corresponds to 0MHz~6MHz；26214*4~26214*5 point corresponds to 6MHz~-12MHz；
26214*5~26214*6 point corresponds to 12MHz~18MHz.
If the point position detected is 13108,39324,65538,91752,117966 and 144180, useful signal is corresponding
Actual frequency fc be then followed successively by -15MHz, -9MHz, -3MHz, 3MHz, 9MHz and 15MHz.The signal detected continues to exceed
Detection threshold, then it is assumed that be the same signal, after detecting signal less than detection threshold, what is detected is next more than detection
The signal of thresholding is considered next useful signal.
Channelizing detection method in a kind of provided spaceborne electromagnetic spectrum monitoring through the invention, can be to acquisition
After signal carries out channelizing processing, the useful signal of each sub-channels is extracted, and the signal of each sub-channels is spelled
Engagement simultaneously, continuously detects continuous signal finally by the detection threshold of each sub-channels, is avoided in this way to acquisition
The missing inspection of signal and false retrieval, and then improve the accuracy of signal detection.
In addition, additionally providing the channelizing detection system in a kind of spaceborne electromagnetic spectrum monitoring in the embodiment of the present invention, such as
Fig. 6 show the structural schematic diagram of the system, which includes:
Channelization block 601 obtains the corresponding time domain letter of each sub-channels for carrying out channelizing processing to acquisition signal
Number；
FFT transform module 602 obtains each sub-channels pair for carrying out FFT transform to the corresponding signal of each sub-channels
The frequency-region signal answered；
Threshold generation module 603, for calculating the corresponding detection of each sub-channels according to the corresponding frequency-region signal of subchannel
Thresholding, and obtain the corresponding detection threshold of each sub-channels；
Processing module 604, for extracting the useful signal in each sub-channels, and by the useful signal continuous
Splicing obtains continuous signal to be detected on frequency domain；According to the corresponding detection threshold of each sub-channels to continuous signal to be detected
It is continuously detected, and extracts and effectively have a frequency point.
Further, the processing module 604 is specifically used for determining useful signal corresponding bandwidth on continuous frequency domain；
Determine the corresponding detection threshold of each bandwidth；When continuously being detected, corresponding detection threshold is used to each bandwidth respectively
It is detected.
Although the preferred embodiment of the application has been described, but one of ordinary skilled in the art once knows substantially
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the application range, including vertex is determined using special symbol, label
Equal changes mode.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (4)
1. the channelizing detection method in a kind of spaceborne electromagnetic spectrum monitoring, which is characterized in that the described method includes:
Channelizing processing is carried out to acquisition signal, obtains the corresponding time-domain signal of each sub-channels；
FFT transform is carried out to the corresponding signal of each sub-channels, obtains the corresponding frequency-region signal of each sub-channels；
According to the corresponding frequency-region signal of subchannel, the corresponding detection threshold of each sub-channels is calculated, and obtains each sub-channels pair
The detection threshold answered；
The useful signal in each sub-channels is extracted, and the useful signal is spliced on continuous frequency domain and is obtained continuously
Signal to be detected；
Continuous signal to be detected is continuously detected according to the corresponding detection threshold of each sub-channels, and extracts and effectively has
Frequency point.
2. the method as described in claim 1, which is characterized in that according to the corresponding detection threshold of each sub-channels to continuously to
Detection signal is continuously detected, comprising:
Determine useful signal corresponding bandwidth on continuous frequency domain；
Determine the corresponding detection threshold of each bandwidth；
When continuously being detected, each bandwidth is detected using corresponding detection threshold respectively.
3. the channelizing detection system in a kind of spaceborne electromagnetic spectrum monitoring, which is characterized in that the system comprises:
Channelization block obtains the corresponding time-domain signal of each sub-channels for carrying out channelizing processing to acquisition signal；
FFT transform module obtains the corresponding frequency of each sub-channels for carrying out FFT transform to the corresponding signal of each sub-channels
Domain signal；
Threshold generation module, for calculating the corresponding detection threshold of each sub-channels according to the corresponding frequency-region signal of subchannel, and
Obtain the corresponding detection threshold of each sub-channels；
Processing module, for extracting the useful signal in each sub-channels, and by the useful signal on continuous frequency domain
Splicing obtains continuous signal to be detected；Continuous signal to be detected is connected according to the corresponding detection threshold of each sub-channels
Continuous detection, and extract and effectively have frequency point.
4. system as claimed in claim 3, which is characterized in that the processing module is specifically used for determining useful signal even
Corresponding bandwidth on continuous frequency domain；Determine the corresponding detection threshold of each bandwidth；When continuously being detected, respectively to each band
Width is detected using corresponding detection threshold.
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