KR20130073682A - Apparatus for real-time searching of signal exist in wide frequency range - Google Patents

Apparatus for real-time searching of signal exist in wide frequency range Download PDF

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KR20130073682A
KR20130073682A KR1020110141663A KR20110141663A KR20130073682A KR 20130073682 A KR20130073682 A KR 20130073682A KR 1020110141663 A KR1020110141663 A KR 1020110141663A KR 20110141663 A KR20110141663 A KR 20110141663A KR 20130073682 A KR20130073682 A KR 20130073682A
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signal
time
segment
frequency
search
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KR1020110141663A
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Korean (ko)
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최영균
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(주)명진시스템
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers

Abstract

PURPOSE: A real time search apparatus of signals is provided to detect various signals in real time, and to obtain characteristic information of signals about detected signals. CONSTITUTION: A real time search apparatus of signals receives and detects signals of allocated frequency bandwidth, by separating a wide frequency bandwidth into a specific bandwidth interval; a signal treatment controller (200) analyzes signals and detected blocks, integrates information about all detected segment signals, and obtains, stores, and outputs information about all frequency bandwidth signal information in the whole frequency bandwidth. [Reference numerals] (100A,100B,100N) Signal receiving and searching block; (200) Signal treatment controller; (210) Signal information DB; (220) Interface unit

Description

Apparatus for real-time searching of signal exist in wide frequency range

The present invention relates to a real-time search device for a signal existing in a wide frequency band, and more particularly, various durations, frequencies, frequency bandwidths such as fixed frequency signals, frequency hopping signals, bursts, pulse signals, etc. that exist in a wide frequency band. The present invention relates to a real-time search apparatus for a signal present in a wide frequency band capable of searching for and processing various signals having a real time.

With the development of wireless communication technology, especially digital communication technology, a number of various signals are newly appearing in a wide frequency band, and the necessity of an apparatus for checking and receiving the existence of these unknown signals in a real propagation environment is emerging. Since the receiver focuses on receiving only signals of a known frequency, there are many limitations in identifying a new signal.

In the conventional general receiver, when searching for a new signal in a wide frequency band, a frequency scanning method of determining the presence of a signal by checking the energy of the signal while increasing the frequency to a predetermined magnitude is mainly used. However, in such a frequency scanning method, since it takes time to scan a predetermined frequency band, in order to receive signals having a shorter duration and not knowing when to appear, such a preliminary time as the appearance time or occupied frequency of the signal having the above-described form is required. Knowing the information could confirm and receive the signal.

Conventionally, in order to completely process the above unknown signals, all the signal bands are digitized, stored, and analyzed. In such a method, when the above unknown signals are required to be processed, an off-line signal processing process is performed in which a large amount of stored digital data of the entire signal band is loaded from the main memory, and only a portion of the signal is extracted for a long time. However, this off-line processing method takes a long time, so there is a problem in that it is not possible to obtain results or information immediately, and thus it is impossible to continuously receive signals of a frequency band of interest.

Therefore, in the technical field to which the present invention belongs, there is an urgent need for a technology capable of searching for such signals having various durations existing in a wide frequency band in real time and processing them in real time.

The present invention has been devised to solve the problems of the prior art as described above, and the signals having various durations and shapes, such as fixed frequency signals, frequency hopping signals, bursts, pulse signals, etc., which exist in a wide frequency band, are omitted. An object of the present invention is to provide a real-time search apparatus for a signal existing in a wide frequency band capable of searching in real time and processing the searched signal to derive specific information of the signal.

According to an aspect of the present invention, there is provided a real-time search apparatus for a signal present in a wide frequency band, the signal receiving unit receiving a signal of a frequency band allocated by a predetermined band interval for a wide frequency band through an antenna; And a signal down converter for down converting the signal received from the signal receiver into an intermediate frequency signal having an intermediate frequency suitable for signal processing, and a digital converter for converting the intermediate frequency signal converted from the signal down converter into a digital signal. And a band dividing unit for dividing the digital signal converted from the digital converting unit into segment digital signals divided into predetermined sub-bands, and time corresponding to each segment digital signal corresponding to the segment digital signal divided from the band dividing unit. Analyze and process in real time as changes At least one signal receiving unit configured to include at least one signal search unit for deriving segment signal information on the searched specific signals to receive and search for a signal of an allocated frequency band by dividing at a predetermined band interval for a wide frequency band And search block; And a signal processing controller for deriving, storing, and outputting signal information of all frequency bands existing in the entire frequency band region by analyzing all the segment signal information analyzed by analyzing and processing the at least one signal receiving and searching block. Characterized in that.

Preferably, the signal search unit of the signal reception and search block may include a spectrogram including frequency-signal strength information at each time point by performing a short time fourier transform (STFT) on each time point of the segment digital signal. A segment digital signal analysis module for continuously calculating spectrograms over time; A segment digital signal search module for deriving segment signal search information for each view by searching for a specific signal existing for each view according to a time change through a spectrogram calculated from the segment digital signal analysis module; And a segment digital signal information derivation module for deriving segment signal information of a frequency domain of the segment digital signal by continuously accumulating the point-in-time segment signal search information derived from the segment digital signal search module according to a time change. .

Preferably, the segment digital signal search module searches for specific signals having a signal strength threshold value or more against the spectrogram against a preset signal strength threshold.

Preferably, the segment digital signal search module does not search for a signal that is lower than a signal strength threshold in the spectrogram as a noise signal.

Preferably, the segment digital signal search module searches for a start frequency and an end frequency of a specific signal searched for each time point according to a time change in the spectrogram.

Preferably, the segment digital signal search module calculates a center frequency of a corresponding signal based on a start frequency and an end frequency of the found specific signal.

Preferably, the segment digital signal search module calculates the center frequency by the following equation.

≪ Equation &

Figure pat00001

Preferably, the segment digital signal search module derives segment signal search information for each view including a start frequency and an end frequency of a specific signal, a center frequency, and signal strength of a specific signal obtained by searching for each view point according to a time change.

Preferably, the segment digital signal information derivation module compares the segment signal search information of each view at a current time point and the segment signal search information of a view at a previous time point derived from the segment digital signal search module. It is determined whether the specific signals present in the same signal.

Preferably, the segment digital signal information derivation module compares the center frequency of the specific signals included in the segment signal search information for each view of the current view with the center frequency of the specific signals included in the segment signal search information for the view of a previous time. If it is within the preset center frequency deviation value, it is determined that the signal is the same.

Preferably, the segment digital signal information derivation module calculates a start time, an end time, and a duration of the same signal based on the first search time and the last search time of the specific signal determined to be the same signal.

Preferably, the segment digital signal information derivation module may include start and end frequencies of specific signals existing in a frequency domain of the segment digital signal obtained as time-dependent segment signal search information is accumulated according to a change in time, and a center frequency of the corresponding signal. The segment signal information including the signal strength, the presence of the same signal, the start time and the end time, and the duration of the same signal are derived.

Preferably, the signal processing controller may include a start time according to a time change of all specific signals determined to be the same signal by combining respective segment signal information derived from each signal search unit of the at least one signal reception and search block. From the correlation between the specific signals based on the and the end time, the duration and the signal strength, the signals are correlated and the occupied frequency bandwidths of the classified signals are calculated.

Preferably, the signal classified in the signal processing controller may be a fixed frequency signal, a frequency hopping signal, a burst or a pulse signal.

Preferably, the signal processing controller, the start frequency and end frequency of all the specific signals present in the entire frequency domain obtained by analyzing all the segment signal information retrieved by analyzing and processing from the at least one signal receiving and searching block, the corresponding signal Deriving the signal information of the entire frequency band including the center frequency, signal strength, whether the same signal, the start time and end time, the duration of the same signal, and the occupied frequency bandwidth of the signal.

Preferably, the signal processing controller further comprises a signal information DB for storing signal information of the entire frequency band.

Preferably, the signal processing controller further includes an interface unit for outputting signal information of the entire frequency band to the outside.

According to the present invention, various signals such as fixed frequency signals, frequency hopping signals, bursts, pulse signals, etc., which exist in a wide frequency band, can be searched in real time in real time, and characteristics information of the found signals can be derived in real time. Can be. In addition, it is possible to accurately derive the center frequency and occupied frequency bandwidth of the signals having extremely short duration and various frequencies without sharing information with the transmitter. In addition, real-time signal search is possible for a wide frequency band, it is possible to easily expand the frequency bandwidth to search. In addition, even without changing or replacing equipment for receiving and searching signals, software or firmware changes allow continuous performance improvement, making it easy to upgrade at low cost to easily adapt to various signals and new signals.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
1 is a block diagram showing a schematic configuration of a device for real-time search of a signal existing in a wide frequency band according to the present invention.
2 is a block diagram illustrating a functional configuration of a signal receiving and searching block according to the present invention.
3 is a block diagram showing a detailed functional configuration of the signal search unit according to the present invention.
FIG. 4 is a diagram illustrating a spectrogram of a signal calculated by performing a short time fourier transform (STFT).
5 is a graph showing signal frequency and signal strength at a specific time point in a spectrogram.
6 is a diagram illustrating signal information derived by a real-time search apparatus for a signal existing in a wide frequency band according to the present invention.
7 is a block diagram showing the configuration of a general-purpose processor that can be employed in the signal processing controller according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a block diagram showing a schematic configuration of a real-time search apparatus for a signal existing in a wide frequency band according to the present invention, Figure 2 is a block diagram showing the functional configuration of the signal receiving and searching block according to the present invention 3 is a block diagram illustrating a detailed functional configuration of a signal search unit according to the present invention, FIG. 4 is a diagram illustrating a spectrogram of a signal calculated by performing a Short Time Fourier Transform (STFT), and FIG. 5. Is a graph showing the signal frequency and signal strength at a specific time in the spectrogram.

Referring to FIG. 1, the apparatus for real-time searching for a signal existing in a wide frequency band according to the present invention is an apparatus for deriving information on various signals existing in a wide frequency band by analyzing and processing the wide frequency band in real time. And at least one signal receiving and searching block 100A, 100B to 100N, a signal processing controller 200, a signal information DB 210, and an interface unit 220.

The signal receiving and searching blocks 100A, 100B to 100N are provided at least one to distribute the digital processing load while batch processing in real time over a wide frequency band, so that each signal receiving and searching block 100A, 100B to 100N is provided. ) Are divided into regular band intervals for a wide frequency band so that signals of the allocated frequency band can be received and searched through the antenna 1. In this case, the number of signal receiving and searching blocks 100A, 100B to 100N may be determined according to the frequency bandwidth to be searched, and when the frequency bandwidth to be searched is needed, the signal receiving and searching blocks 100A and 100B to 100N) can be further increased.

The signal receiving and searching blocks 100A, 100B to 100N convert analog signals received from the antenna 1 into digital signals, and process the digital signals in a software defined manner to search for signals. Digital signal processor (DSP) based digital device. This means that even without changing or replacing equipment for signal reception and discovery, continuous performance improvement can be achieved simply by changing the software or firmware, making it easy to upgrade at low cost to easily adapt to various signals and new signals.

Specifically, as shown in FIG. 2, the signal receiving and searching blocks 100A and 100B to 100N may include a signal receiver 110, a signal down converter 120, a digital converter 130, and a band divider ( 140 and at least one signal search unit 150a, 150b to 150n.

The signal receiver 110 may select and receive only a specific frequency band from an external radio signal received through the antenna 1, and divide the signal into a predetermined band interval for a wide frequency band and then allocate a signal of a frequency band. It serves to receive.

The signal down converter 120 down-converts the signal received from the signal receiver 110 into an intermediate frequency signal having an intermediate frequency suitable for signal processing.

The digital converter 130 digitizes the analog signal into a digital signal by digitizing the intermediate frequency signal converted from the signal down converter 120 so that the digital signal can be processed in a software defined manner. .

The band splitter 140 divides the digital signal converted from the digital converter 130 into segment digital signals divided into predetermined lower bands. Here, the segment digital signal is a signal having a frequency band included in a wide frequency band of the digital signal, and means a digital signal having a frequency band in a narrower range than the wide frequency band. That is, the band divider 140 may reduce the signal processing load by dividing the digital signal converted by the digital converter 130 into segment digital signals having frequency bands of a plurality of lower bands. In this way, the signal processing load can be distributed to enable signal processing in real time.

The signal search units 150a, 150b, and 150n are provided with at least one so as to correspond to segment digital signals divided from the band divider 140, and analyze each segment digital signal in real time according to a time change. Thus, it serves to derive segment signal information about the found specific signals. Here, the segment signal information includes the start frequency and end frequency of specific signals in the frequency domain of the segment digital signal, the center frequency of the corresponding signal, the signal strength, whether the same signal is present, the start time and end time, and the duration of the same signal. Information to include.

As shown in FIG. 3, the signal search units 150a, 150b to 150n include a segment digital signal analysis module 151, a segment digital signal search module 152, and a segment digital signal information derivation module 153. It is composed.

The segment digital signal analysis module 151 performs a short time fourier transform (STFT) on the segment digital signal for each point of time according to a time change to time a spectrogram including frequency-signal strength information at each point in time. Calculate continuously according to the change. Here, the spectrogram calculated through the STFT, for example, as shown in Figure 4, so that the change in the frequency components and the intensity change of the intensity of each frequency component in the segment digital signal over time. On the spectrogram, the color represents the strength of the signal strength, and the signal strength increases from blue to red. At this time, the blue part means a part without a signal, and the red part means a part where a signal exists. That is, the spectrogram illustrated in FIG. 4 shows that the frequency domain information calculated for each view point by the segment digital signal analysis module 151 is continuously accumulated according to time change.

The segment digital signal search module 152 searches for a specific signal existing for each time point according to a time change through the spectrogram calculated from the segment digital signal analysis module 151 to derive the segment signal search information for each time point.

Specifically, the segment digital signal search module 152 searches for a specific signal having a signal strength threshold value or more by comparing the spectrogram with a preset signal strength threshold value. That is, the segment digital signal search module 152 searches only for a signal that has a signal strength threshold or higher as a meaningful specific signal in comparison with the signal strength threshold in the spectrogram. For example, as shown in FIG. 5, when looking at a graph based on signal frequency and signal strength in a spectrogram at a specific time point, only a signal having a signal strength threshold value or more is searched among the signals shown in the frequency region of the horizontal axis. In the case of a signal lower than the signal strength threshold, it is determined as a noise signal and is not searched.

In addition, the segment digital signal search module 152 searches for a start frequency and an end frequency of a specific signal searched for each time point according to a time change in the spectrogram. That is, the segment digital signal search module 152 searches for the low frequency of the searched specific signal as the start frequency and the high frequency as the end frequency except for the noise signal.

In addition, the segment digital signal search module 152 calculates a center frequency of the corresponding signal based on the start frequency and the end frequency of the found specific signal. The center frequency may be calculated by the following equation.

≪ Equation &

Figure pat00002

In addition, the segment digital signal search module 152 derives segment signal search information for each view including a start frequency and an end frequency of a specific signal, a center frequency, and signal strength of a specific signal obtained by searching for each view point according to a time change. .

The segment digital signal information derivation module 153 continuously accumulates the point-by-view segment signal search information derived from the segment digital signal search module 152 according to a change in time, thereby causing segment signal information on the frequency domain of the segment digital signal. To derive

In detail, the segment digital signal information derivation module 153 compares the segment signal search information of each view point in time from the segment digital signal search module 152 and the segment signal search information of view points in a previous view point. It is determined whether specific signals existing in the segment signal search information are the same. That is, the segment digital signal information derivation module 153 compares the center frequencies of the specific signals included in the segment signal search information for each view point of time and the center frequencies of the specific signals included in the segment signal search information for each view of a previous time point. If it is within the center frequency deviation value in advance, it is determined that the signal is the same. The discrimination process is continuously accumulated with time, and is derived as segment signal information of the frequency domain of the segment digital signal.

In addition, the segment digital signal information derivation module 153 may calculate start time, end time, and duration of a specific signal determined to be the same signal when the segment signal search information for each view point is accumulated according to a time change. do. That is, the first search time of the specific signal determined to be the same signal is calculated as the start time, the last search time is calculated as the end time, and the interval between the start time and the end time is calculated as the duration.

In addition, the segment digital signal information derivation module 153 may start and end frequencies of specific signals existing in the frequency domain of the segment digital signal obtained as time-dependent segment signal search information is accumulated according to time changes, and centers of the corresponding signals. Segment signal information including frequency, signal strength, whether or not the same signal, start time and end time, and duration of the same signal are derived.

As such, the signal search units 150a and 150b to 150n include the segment digital signal analysis module 151, the segment digital signal search module 152, and the segment digital signal information derivation module 153. It is possible to process the search for various signals in the frequency domain in real time. This real-time search is possible because the digital signal processing is distributed to at least two or more signal search units 150a, 150b to 150n, This is possible because it is applied as a processing signal.

The signal processing controller 200 analyzes the at least one signal receiving and searching block 100A, 100B to 100N, and aggregates all the segment signal information found to collect signals of the entire frequency band existing in the entire frequency band region. It serves to derive information.

Specifically, the signal processing controller 200 may aggregate the respective segment signal information derived from the signal search units 150a, 150b, 150n of the at least one or more signal receiving and searching blocks 100A, 100B, 100N. Correlated signals may be classified from correlations between specific signals based on a start time and an end time, a duration, and a signal strength according to a time change of all specific signals determined to be the same signal. A typical hopping signal is a frequency hopping signal whose transmission frequency changes periodically. For example, to classify the frequency hopping signal is to detect and classify that the signals are applied with continuity even if the frequencies are different from each other in the currently set frequency band, and that the signals are applied at a predetermined time interval as the frequency hopping signal. Can be identified. The occupied frequency bandwidth of the frequency hopping signal is calculated based on the start frequency and the end frequency of the identified frequency hopping signal.

Further, the signal processing controller 200 may analyze all the specific signals existing in the entire frequency domain obtained by combining all the segment signal information searched by analyzing the at least one signal receiving and searching block 100A, 100B to 100N. Signal information of the entire frequency band is derived including the start frequency and the end frequency, the center frequency of the corresponding signal, the signal strength, whether the same signal is present, the start time and end time, duration, and occupied frequency bandwidth of the same signal.

In addition, the signal processing controller 200 may be provided with a signal information DB 210 to store signal information of all frequency bands, or an interface unit 220 may be provided to output signal information of all frequency bands to the outside. .

On the other hand, the signal information of the entire frequency band output through the real-time search device for the signal existing in the wide frequency band according to the present invention is communicated through the process of synthesizing by matching with the input signal delayed for a certain time before the signal search process Alternatively, it can be converted into a data signal. However, the present invention is not limited to the manner of utilizing the signal information of the entire frequency band found.

More specifically, a process of deriving signal information by a real-time search apparatus for a signal existing in a wide frequency band according to the present invention will be described with reference to FIG. 6.

6 is a diagram illustrating signal information derived by a real-time search apparatus for a signal existing in a wide frequency band according to the present invention. FIG. 6 is a view schematically illustrating only the characteristic elements of the spectrogram calculated and accumulated by the segment digital signal analysis module 151 of the signal search units 150a and 150b to 150n.

In the horizontal axis the frequency domain in the spectrogram of Fig. 6 f A, f B and f C will represent the frequency band allocation of said plurality of signal receiving and search block (100A, 100B ~ 100N), each of f A, f F A1 , f A2 and f A3 included in B and f C , f B1 , f B2 And f B3 and f C1 , f C2 and f C3 represent the lower frequency bands divided by the signal search units 150a, 150b to 150n of the signal receiving and searching blocks 100A, 100B and 100C.

First, the signal search in the signal search unit 50a, 150b to 150n can be searched for a signal at a specific time point of the spectrogram, as shown in f A2 of f A on the spectrogram, and the search signal is time If it continues in accordance with the change, it is determined that the same signal. At this time, even if the signal continues in succession, if the center frequency does not fall within the center frequency deviation value, it is discriminated as another signal. Also, in the searched signal, the lower frequency becomes the start frequency f s and the higher frequency is searched for as the end frequency f e . The centers of the start frequency f s and the end frequency f e become the center frequency f c . In addition, the first searched time point in the searched signal becomes the start time t s of the same signal, and the last searched time point is searched for as the end time t e of the same signal. Then, the interval between the start time t s and the end time t e becomes the duration t d .

Next, classification of the signals correlated with each other in the signal processing controller 200, e.g., classification of the frequency hopping signal, is shown in f B1 , f B2 and f B3 of f B on the spectrogram. Frequency hopping for the search signals f h1 , f h2, and f h3 , which are searched in the set frequency band and whose frequency is changed in the frequency domain but whose continuity with time changes, that is, the period of appearance (t p ) of the signal has a certain pattern It can be identified as a signal, and the starting and ending frequency points of the frequency hopping signals f h1 , f h2 and f h3 are calculated as the occupied frequency bandwidth f obw of the frequency hopping signal.

Meanwhile, the signal receiving and searching blocks 100A, 100B to 100N and the signal searching and processing processes of the signal processing controller 200 of the apparatus for real-time searching for signals existing in a wide frequency band according to the present invention may use various computer processor means. It may be embodied in the form of program instructions that can be executed through the program, and recorded in a readable medium by the computer processor means. The computer processor readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be those known to those skilled in the computer program arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Hardware devices specially configured to store and execute program instructions such as magneto-optical media and ROM, RAM, flash memory and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

7 is a block diagram showing the configuration of a general-purpose processor that can be employed in the signal processing controller according to the present invention.

The signal processing controller 200 includes one or more processors 201 connected to a main memory including a RAM 202 and a ROM 203. The processor 201 may be called a central processing unit (CPU), and may drive a control algorithm for digital signal processing performed by the signal processing controller 200. As is well known in the art, the ROM 202 serves to transmit data and instructions to the processor 201 in one direction, and the RAM 203 typically transmits data and instructions to the processor 201 bidirectionally. It is used to RAM 202 and ROM 203 may comprise any suitable form of computer readable media. In addition, the mass storage device 204 is used to store programs, data, and the like, and is typically an auxiliary memory device such as a hard disk that is slower than the main memory device, and the signal information DB 210 may correspond thereto. In addition, the processor 201 is connected to an input / output device such as a display module, a mouse, a keyboard, a microphone, a touch screen display, and a signal receiving device through the input / output interface 205. In addition, the processor 201 may be connected to a wired or wireless communication network through the network interface 206. Through such a network connection, the signal receiving and searching blocks 100A, 100B to 100N and the signal searching and processing in the signal processing controller 200 may be performed. The apparatus and tools described above are well known to those skilled in the computer hardware and software arts. Meanwhile, the hardware device described above may be applied not only to the signal processing controller 200 but also to the signal receiving and searching blocks 100A and 100B to 100N, and configured to operate as one or more software modules to perform the operation of the present invention. Can be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100A ~ 100N: Signal Receive and Search Block
110: signal receiver 120: signal down converter
130: digital conversion unit 140: band division unit
150a to 150n: signal search unit 200: signal processing controller

Claims (17)

A signal receiver which receives signals of an allocated frequency band through a antenna by dividing the signal into a predetermined band interval for a wide frequency band;
A signal down converter for down converting the signal received from the signal receiver into an intermediate frequency signal having an intermediate frequency suitable for signal processing;
A digital converter for converting the intermediate frequency signal converted from the signal down converter into a digital signal;
A band dividing unit dividing the digital signal converted from the digital converting unit into segment digital signals divided into predetermined lower bands;
And at least one signal searcher corresponding to each segment digital signal divided from the band divider and analyzing the segment digital signal in real time according to a time change to derive segment signal information on the found specific signals. At least one signal receiving and searching block for receiving and searching for a signal of an allocated frequency band by dividing a predetermined band interval for a wide frequency band; And
A signal processing controller for deriving, storing, and outputting signal information of all frequency bands existing in the entire frequency band region by analyzing all the segment signal information analyzed by analyzing and processing the at least one signal receiving and searching block; Real-time search device for a signal existing in a wide frequency band characterized in that. The method of claim 1,
The signal search unit of the signal reception and search block,
Segmented digital signal that continuously generates a spectrogram including frequency-signal strength information at each time point by performing a short time fourier transform (STFT) for each time point of the segmented digital signal. An analysis module;
A segment digital signal search module for deriving segment signal search information for each view by searching for a specific signal existing for each view according to a time change through a spectrogram calculated from the segment digital signal analysis module; And
And a segment digital signal information derivation module for deriving segment signal information for a frequency domain of the segment digital signal by continuously accumulating the point-in-time segment signal search information derived from the segment digital signal search module according to a change in time. A device for real-time searching for a signal existing in a wide frequency band. The method of claim 2,
The segment digital signal search module,
And searching for specific signals having a signal strength threshold value or more against the spectrogram against a preset signal strength threshold value. The method of claim 3,
The segment digital signal search module,
In the case of a signal lower than the signal strength threshold value in the spectrogram, the real-time search device for a signal existing in a wide frequency band characterized in that the search is not determined as a noise signal. The method of claim 2,
The segment digital signal search module,
And a start frequency and an end frequency of a specific signal searched for each time point according to a time change in the spectrogram. The method of claim 5,
The segment digital signal search module,
And a center frequency of the corresponding signal is calculated based on a start frequency and an end frequency of the searched specific signal. The method according to claim 6,
The segment digital signal search module is a real-time search device for a signal in a wide frequency band, characterized in that to calculate the center frequency by the following equation.
≪ Equation &
Figure pat00003
 The method of claim 2,
The segment digital signal search module,
Segment signal search information for each point of time including the start frequency and the end frequency of the specific signal, the center frequency, and the signal strength of the specific signal obtained by searching for each point of time according to the change of time is derived. Real time navigation device. The method of claim 2,
The segment digital signal information derivation module,
Comparing the segment signal search information for each view of the current view and the segment signal search information for the view of the previous view, which are derived from the segment digital signal search module, to determine whether the same signals are present in the segment signal search information for the two views. Real-time search device for a signal existing in a wide frequency band characterized in that. 10. The method of claim 9,
The segment digital signal information derivation module,
The center frequency of the specific signals included in the segment signal search information of each view point of the current view and the center frequency of the specific signals included in the segment signal search information of the view points of the previous view are compared to be equal to each other within a preset center frequency deviation value. A real-time search apparatus for a signal existing in a wide frequency band, characterized in that it is determined to be a signal. 10. The method of claim 9,
The segment digital signal information derivation module,
And a start time, an end time, and a duration of the same signal based on an initial search time and a final search time of a specific signal determined to be the same signal. The method of claim 2,
The segment digital signal information derivation module,
As the segment signal search information for each time point is accumulated according to the change of time, the start frequency and end frequency of specific signals existing in the frequency domain of the segment digital signal, the center frequency of the corresponding signal, the signal strength, whether the same signal is present, A device for real-time searching for a signal existing in a wide frequency band characterized by deriving segment signal information including a start time, an end time, and a duration. The method of claim 1,
The signal processing controller,
Start time and end time, duration time and signal strength according to time change of all the specific signals determined to be the same signal by combining the respective segment signal information derived from each signal search unit of the at least one signal reception and search block And classifying signals that are related to each other from correlations between specific signals, and calculating occupied frequency bandwidths of the classified signals. The method of claim 13,
And a signal classified in the signal processing controller are fixed frequency signals, frequency hopping signals, bursts or pulse signals. The method of claim 13,
The signal processing controller,
Starting and ending frequencies of all the specific signals present in the entire frequency domain obtained by analyzing all the segment signal information searched by analyzing and processing the at least one signal receiving and searching block, the center frequency of the corresponding signal, the signal strength, and the same signal. And whether or not, the signal information of the entire frequency band including the start time and the end time, the duration of the same signal, and the occupied frequency bandwidth of the signal. The method of claim 1,
The signal processing controller,
The apparatus for real-time searching for a signal existing in a wide frequency band further comprising a signal information DB for storing signal information of the entire frequency band. The method of claim 1,
The signal processing controller,
An apparatus for real-time searching for a signal existing in a wide frequency band, further comprising an interface unit for outputting signal information of the entire frequency band to the outside.
KR1020110141663A 2011-12-23 2011-12-23 Apparatus for real-time searching of signal exist in wide frequency range KR20130073682A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102219087B1 (en) * 2020-09-02 2021-02-23 세종대학교산학협력단 Indoor situation recognition system and method using FMCW radar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102219087B1 (en) * 2020-09-02 2021-02-23 세종대학교산학협력단 Indoor situation recognition system and method using FMCW radar

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