CN102087353B - Method and equipment for suppressing interference - Google Patents
Method and equipment for suppressing interference Download PDFInfo
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- CN102087353B CN102087353B CN200910241404.9A CN200910241404A CN102087353B CN 102087353 B CN102087353 B CN 102087353B CN 200910241404 A CN200910241404 A CN 200910241404A CN 102087353 B CN102087353 B CN 102087353B
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Abstract
The invention discloses a method and equipment for suppressing interference and belongs to the field of wireless communication. The method comprises the following steps of: adjusting a filtering threshold and a signal threshold value according to a position of a receiving end, an external environment and a signal propagation error factor; when suppressing interference in the signal has a narrow-band type, intercepting the signal through a window function, and removing the suppressing interference of which the frequency spectrum exceeds the filtering threshold from the intercepted signal; when suppressing interference in the signal has a wideband type, acquiring an interference cancelling signal, and removing the suppressing interference from the signal by utilizing the interference cancelling signal; and determining whether the signal is deception interference according to the signal threshold value, if so, discarding the signal, otherwise, determining that the signal is a normal signal. The interference can be suppressed under the condition that interference characteristics are not known in advance, and the wideband interference can be suppressed, and the deception interference is effectively suppressed.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of method and apparatus that suppresses interference.
Background technology
GPS (Global Position System) is the important Information base in various countries and strategic facility, has been widely used in the key areas such as national defence.In Military Application and part civil area, the integrity of satellite navigation and continuity have been proposed to very high requirement.Yet the power that arrives ground due to navigation satellite signal is extremely faint, satellite navigation receiving terminal is easy to be interfered; Especially artificial pressing type interference and deception formula are disturbed to application and have been brought huge hidden danger.
For pressing type, disturb, have at present the method for following several inhibition, comprising:
The first: produce a signal relevant to pressing type interference signal at receiving terminal, this signal is added in the signal that receiving terminal receives by sef-adapting filter, elimination pressing type interference signal.
The second: adopt many array-element antenna battle array to suppress to disturb, be specially: many array-element antenna battle array comprises a plurality of antennas, each antenna is connected with microwave network, processor respectively, when the signal from certain direction of judging reception when processor exists pressing type to disturb, the signal of adjusting this antenna reception is zero, to eliminate interference.
For deception formula, disturb, can suppress by following method at present, comprising:
The parameter of the satellite-signal that receiving terminal receives comprises power, related channel program integrated value and track major radius etc.Wherein, each parameter has normal working range, for example the working range of power be-110dBm is to-133dBm, the working range of related channel program integrated value be 5100 to 1821776 and the working range of track major radius be 5.153600E+003 to 5.153699E+003.When the signal from receiving, extract the paranormal working range of certain parameter time, can judge that this signal, as deception formula interference signal, directly abandons this signal.
In realizing process of the present invention, inventor finds that prior art at least exists following problem:
For pressing type, disturb:
In above-mentioned first method, need to know in advance the feature of pressing type interference signal, thereby produce relative signal to realize Interference Cancellation, therefore in the situation that knowing its feature, just cannot not realize.
In above-mentioned second method, the pressing type that is only applicable to arrowband type disturbs, the pressing type of wide-band type disturbs and just can not well suppress it.
For deception formula, disturb: the parameter of not considering signal under different occasions and emergency case can be undergone mutation etc., thereby can not effectively suppress to disturb.
Summary of the invention
In order can also to suppress to disturb in the situation that not knowing interference characteristic in advance, can suppress the interference in broadband and effectively suppress deception formula and disturb, the embodiment of the present invention provides a kind of method and apparatus that suppresses interference.Described technical scheme is as follows:
Suppress a method of disturbing, described method comprises:
According to the position at receiving terminal place and external environment and signal propagation errors factor, adjust filter threshold and signal threshold value;
Pressing type in signal disturbs as arrowband type, by window function, intercepts described signal, removes the pressing type interference that frequency spectrum surpasses described filter threshold from the signal of described intercepting;
Pressing type in described signal disturbs as wide-band type, obtains interference-cancelled signals, and utilizes described interference-cancelled signals from described signal, to remove pressing type and disturb;
According to described signal threshold value, determine whether described signal is that deception formula is disturbed, and if so, abandons described signal, and if not, described signal is normal signal;
Wherein, describedly by window function, intercept described signal, from the signal of described intercepting, remove the pressing type that frequency spectrum surpasses described filter threshold and disturb, specifically comprise:
By described window function, intercept described signal, and the signal of described intercepting is carried out to fast fourier transform obtain spectrum signal;
From described spectrum signal, remove frequency spectrum over the pressing type interference of described filter threshold;
In the spectrum signal disturbing according to described removal pressing type, trend and the slope of spectral line, match a spectrogram with the spectrogram of having stored, and take the spectrogram of described coupling as with reference to carrying out linear interpolation, obtains reconstruction signal;
Utilize described reconstruction signal to compensate the spectrum signal that described removal pressing type disturbs;
The spectrum signal of described compensation is carried out to inverse Fourier transform, obtain the signal of described intercepting.
The position at described receiving terminal place at least comprises longitude and latitude and height above sea level, the external environment at described receiving terminal place at least comprises air humidity and obstacle around, described signal propagation errors factor at least comprises ionosphere and tropospheric refraction, and described signal threshold value at least comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope;
Correspondingly, described according to the position at receiving terminal place and external environment and signal propagation errors factor, adjust filter threshold and signal threshold value, specifically comprise:
According to the variation of described ionosphere, described tropospheric refraction and/or described height above sea level, adjust the size of described power bracket;
According to the variation of described longitude and latitude, described height above sea level, described ionosphere and/or described tropospheric refraction, adjust the size of described time of advent of scope;
According to the variation of described ionosphere, described tropospheric refraction, described longitude and latitude and/or described height above sea level, adjust the size of described arrival angular range;
According to the variation of described longitude and latitude, described ionosphere, described tropospheric refraction and/or described air humidity, adjust the size of described navigational parameter scope;
According to the variation of described ionosphere, described tropospheric refraction, described peripheral obstacle and/or described air humidity, adjust the size of described filter threshold.
The described interference-cancelled signals of obtaining, and utilize described interference-cancelled signals from described signal, to remove pressing type and disturb, specifically comprise:
From described signal, extract characteristic parameter, described characteristic parameter at least comprises variance, average, frequency and cycle;
By described characteristic parameter and the signal characteristic of having stored, carry out linear matched, produce and disturb relevant interference-cancelled signals to described pressing type;
Described interference-cancelled signals is carried out to adaptive-filtering, the more described interference-cancelled signals after adaptive-filtering is added in described signal, the pressing type of removing in described signal disturbs.
Described according to described signal threshold value, determine whether described signal is that deception formula is disturbed, and if so, abandons described signal, and if not, described signal is normal signal, specifically comprises:
Whether the power that judges described signal is the value in described power bracket, and if not, described signal is that deception formula is disturbed, and abandons described signal;
If the value in described power bracket judges whether is the value within the scope of the described time of advent time of advent of described signal, if not, described signal is that deception formula is disturbed, and abandons described signal;
If the value within the scope of the described time of advent judges whether the arrival angle of described signal is the value in described arrival angular range, if not, described signal is that deception formula is disturbed, and abandons described signal;
If the value in described arrival angular range judges whether the navigational parameter of described signal is the value within the scope of described navigational parameter, if not, described signal is that deception formula is disturbed, and abandons described signal; If so, described signal is the normal signal from satellite.
Described according to the position at receiving terminal place and external environment and signal propagation errors factor, after adjusting filter threshold and signal threshold value, also comprise:
Receive a plurality of signals, described signal is at least four;
Whether the signal to noise ratio that judges described signal surpasses default threshold value;
If surpass the number of the signal of described threshold value, be at least four, will not surpass the signal balancing of described threshold value, and record do not surpass the direction of the signal of described threshold value;
If surpass the number of the signal of described threshold value, be less than four, abandon all described signals, adjust the gain of the main lobe of antenna diagram, utilize described main lobe again to receive signal.
Suppress the equipment disturbing, described equipment comprises:
Adjusting module, for according to the position at receiving terminal place and external environment and signal propagation errors factor, adjusts filter threshold and signal threshold value;
The first removal module, disturbs as arrowband type for the pressing type when signal, by window function, intercepts described signal, removes the pressing type interference that frequency spectrum surpasses described filter threshold from the signal of described intercepting;
Second removes module, for the pressing type when described signal, disturbs as wide-band type, obtains interference-cancelled signals, and utilizes described interference-cancelled signals from described signal, to remove pressing type and disturb;
Determination module, for according to described signal threshold value, determines whether described signal is that deception formula is disturbed, and if so, abandons described signal, and if not, described signal is normal signal;
Wherein, described the first removal module specifically comprises:
Interception unit, for intercepting described signal by described window function, and carries out fast fourier transform to the signal of described intercepting and obtains spectrum signal;
The first removal unit, the pressing type that surpasses described filter threshold for remove frequency spectrum from described spectrum signal disturbs;
Obtain unit, trend and slope for the spectrum signal spectral line that disturbs according to described removal pressing type, match a spectrogram with the spectrogram of having stored, and take the spectrogram of described coupling as with reference to carrying out linear interpolation, obtains reconstruction signal;
Compensating unit, for utilizing described reconstruction signal to compensate the spectrum signal that described removal pressing type disturbs;
Converter unit, for the spectrum signal of described compensation is carried out to inverse Fourier transform, obtains the signal of described intercepting.
The position at described receiving terminal place at least comprises longitude and latitude and height above sea level, the external environment at described receiving terminal place at least comprises air humidity and obstacle around, described signal propagation errors factor at least comprises ionosphere and tropospheric refraction, and described signal threshold value at least comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope;
Correspondingly, described adjusting module specifically comprises:
The first adjustment unit, for according to the variation of described ionosphere, described tropospheric refraction and/or described height above sea level, adjusts the size of described power bracket;
The second adjustment unit, for according to the variation of described longitude and latitude, described height above sea level, described ionosphere and/or described tropospheric refraction, adjusts the size of described time of advent of scope;
The 3rd adjustment unit, for according to the variation of described ionosphere, described tropospheric refraction, described longitude and latitude and/or described height above sea level, adjusts the size of described arrival angular range;
The 4th adjustment unit, for according to the variation of described longitude and latitude, described ionosphere, described tropospheric refraction and/or described air humidity, adjusts the size of described navigational parameter scope;
The 5th adjustment unit, for according to the variation of described ionosphere, described tropospheric refraction, described peripheral obstacle and/or described air humidity, adjusts the size of described filter threshold.
Described second removes module specifically comprises:
Extraction unit, for extracting characteristic parameter from described signal, described characteristic parameter at least comprises variance, average, frequency and cycle;
Linear matched unit, for carrying out linear matched by described characteristic parameter and the signal characteristic of having stored, produces and disturbs relevant interference-cancelled signals to described pressing type;
The second removal unit, for described interference-cancelled signals is carried out to adaptive-filtering, then is added to the described interference-cancelled signals after adaptive-filtering in described signal, and the pressing type of removing in described signal disturbs;
Described determination module specifically comprises:
The first judging unit, for judging whether the power of described signal is the value in described power bracket, if not, described signal is that deception formula is disturbed, and abandons described signal;
The second judging unit, for if the value in described power bracket judges whether is the value within the scope of the described time of advent time of advent of described signal, if not, described signal is that deception formula is disturbed, and abandons described signal;
The 3rd judging unit, for if the value within the scope of the described time of advent judges whether the arrival angle of described signal is the value in described arrival angular range, if not, described signal is that deception formula is disturbed, and abandons described signal;
The 4th judging unit, for if the value in described arrival angular range judges whether the navigational parameter of described signal is the value within the scope of described navigational parameter, if not, described signal is that deception formula is disturbed, and abandons described signal; If so, described signal is the normal signal from satellite.
Described equipment also comprises:
Receiver module, for receiving a plurality of signals, described signal is at least four; Whether the signal to noise ratio that judges described signal surpasses default threshold value; If surpass the number of the signal of described threshold value, be at least four, will not surpass the signal balancing of described threshold value, and record do not surpass the direction of the signal of described threshold value; If surpass the number of the signal of described threshold value, be less than four, abandon all described signals, adjust the gain of the main lobe of antenna diagram, utilize described main lobe again to receive signal.
By according to the variation of the position of receiving terminal and external environment, adjust filter threshold and signal threshold value, the pressing type of removing arrowband by filter threshold disturbs, and the pressing type of removing broadband by obtaining interference-cancelled signals disturbs, and by signal threshold value, determines whether signal is that deception formula is disturbed.So do not know in advance the feature of interference, also can suppress to disturb, the pressing type that can suppress broadband disturbs, and has also considered the position of receiving terminal and the variation of external environment, can effectively suppress deception formula and disturb.
Accompanying drawing explanation
Fig. 1 is a kind of method flow diagram that suppresses interference that the embodiment of the present invention 1 provides;
Fig. 2 is a kind of method flow diagram that suppresses interference that the embodiment of the present invention 2 provides;
Fig. 3 is a kind of equipment schematic diagram that suppresses interference that the embodiment of the present invention 3 provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment 1
As shown in Figure 1, the embodiment of the present invention provides a kind of method that suppresses interference, comprising:
Step 101: according to the position at receiving terminal place and external environment and signal propagation errors factor, adjust filter threshold and signal threshold value;
Wherein, the position at receiving terminal place at least comprises longitude and latitude and height above sea level, the external environment at receiving terminal place at least comprises air humidity and obstacle around, signal propagation errors factor at least comprises ionosphere and tropospheric refraction, and the signal threshold value of need adjusting at least comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope.
Step 102: the type that the compacting in the signal that judgement receives is disturbed, if the pressing type in signal disturbs as arrowband type, performs step 103: if the pressing type in the signal receiving disturbs as wide-band type, perform step 104:
Step 103: intercept the signal receiving by window function, remove the pressing type interference that frequency spectrum surpasses filter threshold from the signal of intercepting;
Step 104:, obtain interference-cancelled signals, and utilize interference-cancelled signals from the signal receiving, to remove pressing type and disturb;
Step 105: according to signal threshold value, determine whether the signal receiving is that deception formula is disturbed, and if so, performs step 106; If not, the signal receiving is normal signal, EO;
Step 106: abandon the signal of reception, EO.
In embodiments of the present invention, by according to the variation of the position of receiving terminal and external environment and signal propagation errors factor, adjust filter threshold and signal threshold value, the pressing type of removing arrowband by filter threshold disturbs, the pressing type of removing broadband by obtaining interference-cancelled signals disturbs, and by signal threshold value, determines whether signal is that deception formula is disturbed.So do not know in advance the feature of interference, also can suppress to disturb, the pressing type that can suppress broadband disturbs, and has also considered the position of receiving terminal and the variation of external environment, can effectively suppress deception formula and disturb.
Embodiment 2
As shown in Figure 2, the embodiment of the present invention provides a kind of method that suppresses interference, comprising:
Step 201: according to the position at receiving terminal place and external environment, and signal propagation errors factor, signal threshold value and filter threshold to the knowledge base storage in receiving terminal are adjusted, wherein, the signal threshold value of need adjusting comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope;
Wherein, receiving terminal position at least comprises longitude and latitude and height above sea level, and the external environment at receiving terminal place at least comprises surrounding's obstacle and/or the air humidity of receiving terminal, and signal propagation errors factor at least comprises ionosphere and tropospheric refraction.
Wherein, the position at the place of the transducer Real-Time Monitoring receiving terminal of receiving terminal and external environment and signal propagation errors factor, when detecting the position at receiving terminal place and/or the variation of external environment and signal propagation errors factor, carry out this step, particularly, according to the variation of the height above sea level at ionosphere, troposphere folding body and/or receiving terminal place, adjust the size of the power bracket in knowledge base; According to the variation of the residing longitude and latitude of receiving terminal, height above sea level, ionosphere and/or tropospheric refraction, adjust the size of scope time of advent in knowledge base; According to the longitude and latitude of receiving terminal position and height above sea level, the variation of ionosphere and tropospheric refraction, the size of the arrival angular range in adjustment knowledge base; According to the variation of longitude and latitude, ionosphere, tropospheric refraction and/or air humidity, adjust the size of navigational parameter scope; According to the variation of the humidity of the peripheral obstacle of the ionosphere at receiving terminal place, tropospheric refraction, receiving terminal and/or air, adjust the size of filter threshold.
Wherein, the in advance different position at storing received end place and the corresponding relation of external environment and signal threshold value in knowledge base.For example, the corresponding relation of excursion and the filter threshold of tropospheric refraction is set in advance in knowledge base, as shown in table 1, when detecting the changing value of tropospheric refraction, from the filter threshold value that needs to adjust as found out the corresponding relation of table 1.
Table 1
| The excursion of tropospheric refraction | Filter threshold |
| [5-6) | 2 |
| [6-7) | 3 |
| ...... | ...... |
Wherein, the power obtaining from signal, the time of advent, arrival angle and navigational parameter all change along with the difference of the residing position of receiving terminal or external environment and signal propagation errors factor.Therefore, according to the position at receiving terminal place and external environment, adjust knowledge base, can suppress exactly to disturb, prevent that the power obtaining from signal under different occasions and emergency case, the time of advent, arrival angle from occurring and navigational parameter sudden change, cannot effectively suppress to disturb.
Step 202: receive the signal sending from satellite;
Wherein, in the signal of reception, may disturb with pressing type the signal mixing mutually for the normal signal from satellite, also may disturb the signal mixing mutually for pressing type Counter Measures And Deception formula.Receiving terminal needs four different signals to position self, so the signal receiving is at least four, the number of satellite is also at least four.The signal that utilizes antenna reception satellite to send, and each antenna at least receives the signal that a satellite sends.
Step 203: whether the signal to noise ratio that judges each signal surpasses default threshold value, is at least four if surpass the signal number of this threshold value, performs step 204; If surpass the signal number of this threshold value, be less than four, perform step 205; '
Step 204: for not surpassing the signal of this threshold value, control antenna, by signal balancing, does not receive the signal that does not surpass this threshold value, receives only the signal over this threshold value, execution step 206;
Wherein, if the signal to noise ratio in signal does not surpass this threshold value, show that this signal is subject to stronger pressing type and disturbs, the method that can return to zero by antenna, abandon this signal, the direction at this signal place can also be recorded in knowledge base, while utilizing antenna receiving signal, directly skip this direction next time simultaneously.
Step 205: adjust the main lobe of each antenna diagram to satelloid, increase the gain of the main lobe pattern of antenna diagram, the main lobe by antenna diagram receives the signal from satellite again;
Wherein, the antenna diagram of antenna comprises a main lobe and a plurality of secondary lobe, and the main lobe of antenna diagram receives after signal, can improve the signal to noise ratio of the signal of reception by improving the gain of the main lobe of antenna diagram, and the signal to noise ratio of the signal again receiving by main lobe is enhanced.
Step 206: for the signal of one of them reception, judge the type that the pressing type in the signal of this reception disturbs, if the pressing type of arrowband disturbs, perform step 207; If the pressing type in broadband disturbs, perform step 210;
Wherein, the number of the signal of reception is at least four, identical to the processing procedure of each signal, so for convenience of description, the signal of take describes as example.In addition, the signal of reception is all time-domain signal.
Step 207: resolution as required and the frequency of signal are selected window function, the signal that utilizes this window function intercepting to receive;
Wherein, resolution can arrange as required in advance, particularly, the frequency of signal and resolution are done to the calculating of ratio computing, draw window width, by window width, map out corresponding main lobe wider poor with principal subsidiary lobe, wide poor with principal subsidiary lobe according to main lobe, in the window function of storing, select corresponding window function from knowledge base.
Wherein, window function comprises main lobe and a plurality of secondary lobe, and secondary lobe is divided into the first secondary lobe, the second secondary lobe etc.It is wide that the width of main lobe is main lobe, and it is poor that the difference in height of main lobe and the first secondary lobe is principal subsidiary lobe.
Step 208: the signal of intercepting is carried out to FFT (Fast Fourier Transform, fast fourier transform) conversion, obtain spectrum signal, and remove the pressing type interference signal that frequency spectrum surpasses filter threshold from this spectrum signal;
Wherein, for the normal signal from satellite, the most of frequency spectrum obtaining after converting by FFT can not surpass filtering threshold value, therefore, can filter out the frequency spectrum that pressing type disturbs by filter threshold.In addition, by filter threshold, likely offset the frequency spectrum of the normal signal of part.
Step 209: trend and the slope of spectral line in the spectrum signal disturbing according to removal pressing type, obtain reconstruction signal, utilize this reconstruction signal compensation to remove the spectrum signal of pressing type interference; The spectrum signal of compensation is carried out to IFFT (Inverse Fast Fourier Transform, inverse Fourier transform) conversion and obtain time-domain signal, the signal that this time-domain signal disturbs for removing pressing type, execution step 212;
Particularly, trend and the slope of spectral line in the spectrum signal disturbing according to removal pressing type, the spectrogram of having stored with knowledge base mates, obtain a spectrogram, take this spectrogram as reference, by carrying out linear interpolation to removing the spectrum signal of pressing type interference, obtain reconstruction signal, utilize this reconstruction signal compensation to remove the spectrum signal that pressing type disturbs; The spectrum signal of compensation is carried out to IFFT conversion and obtain time-domain signal.
Wherein, in knowledge base, store in advance the spectrogram of a large amount of signal models; First spectrum signal removal pressing type being disturbed mates with the spectrogram of each signal model in knowledge base, matches the most similar spectrogram, refers again to this spectrogram and carries out linear interpolation to removing the spectrum signal of pressing type interference, obtains reconstruction signal.The partial frequency spectrum that this reconstruction signal lacks with respect to this spectrogram for removing the spectrum signal of pressing type interference.
Wherein, the spectrum signal that utilizes this reconstruction signal compensation to remove pressing type interference is specially: reconstruction signal and the spectrum signal that removal pressing type disturbs are reconstructed.
In addition, utilize window function that step 207 obtains intercept signal in the remaining signal from the signal receiving again, then the pressing type of removing by step 208 and 209 in the signal of intercepting disturbs, so, repeat intercepting until intercept complete the signal receiving.
Step 210: from the signal receiving, extract characteristic parameter and comprise variance, average, frequency and cycle etc., and by the signal characteristic in the characteristic parameter of extraction and knowledge base is carried out to linear matched, produce to the pressing type in the signal receiving and disturb relevant interference-cancelled signals;
Further, the interference-cancelled signals of generation can also be stored in knowledge base, upper, while once receiving identical signal, can directly with the pressing type that the interference-cancelled signals of storage is removed in signal, disturb.
Step 211: this interference-cancelled signals is carried out to adaptive-filtering, then this interference-cancelled signals after adaptive-filtering is added in the signal of this reception, the pressing type of eliminating in the signal of this reception disturbs;
Wherein, now the pressing type in the signal receiving is disturbed and suppressed, now this signal may be the normal signal from satellite, or may be deception formula interference signal.Following step judges whether this signal is deception formula interference signal exactly.
Step 212: extract the performance number of the signal of this reception from the signal receiving, whether the power that judgement is extracted belongs to the value in the power bracket of storing in knowledge base, if so, performs step 213; If not, this signal is that deception formula is disturbed, execution step 219;
Step 213: the time of advent that obtains this signal from the signal of this reception;
Particularly, according to the signal of this reception, produce reproduction code, calculate the number of chips being offset between the signal that receives and reproduction code, according to number of chips and chip-spaced, do product and calculate the arrival time.
Wherein, receiving terminal, according to the signal receiving, reappears the chip sequence sending at delivery time and is reproduction code (this is prior art, and the present embodiment is not limited).Chip in chip in the signal receiving and reproduction code is all that to take 1023 chips be cycle period, in each cycle, there is an initial chip, the initial chip sequence number of the initial chip sequence number in the signal of reception and reproduction code is subtracted each other and obtained the signal receiving and the number of chips that reappears skew between code.
Step 214: whether belong to the value within the scope of the time of advent of storing in knowledge base the time of advent that judges the signal of this reception, if so, performs step 215, if not, performs step 219;
Wherein, the value time of advent that deception formula is disturbed surpasses the scope time of advent of storing in knowledge base, so if the value time of advent of the signal receiving does not belong to the value within the scope of the time of advent, the signal receiving is that deception formula is disturbed.
Step 215: extract from the signal receiving and arrive angle, wherein, arriving angle is the angle of line and the angle between horizontal plane of satellite and receiving terminal;
Step 216: judge that whether this angle of arrival belongs to the value in the arrival angular range of storing in knowledge base, if so, performs step 217; If not, perform step 219;
Wherein, the arrival angle that deception formula is disturbed surpasses the arrival angular range of storing in knowledge base, so if the arrival angle of the signal receiving does not belong to certain value arriving in angular range, the signal receiving is that deception formula is disturbed.
Step 217: extract orbit radius and deflection from the signal receiving, wherein, orbit radius and deflection form navigational parameter jointly, the line of satellite and receiving terminal projection straight line on horizontal plane, and the X-axis in this straight line and horizontal plane or the angle of Y-axis are deflection;
Step 218: judge whether this navigational parameter belongs to certain value within the scope of the navigational parameter of storing in knowledge base, if so, the signal of this reception is the normal signal from satellite, EO, if not, execution step 219;
Wherein, the navigational parameter of deception formula interference signal surpasses the navigational parameter scope of storing in knowledge base, so the navigational parameter of the signal receiving does not belong to certain value within the scope of navigational parameter, the signal receiving is that deception formula is disturbed.
Step 219: the signal of this reception is that deception formula is disturbed, and directly abandons this signal, EO.
Wherein, repeatedly according to step 206-219, the remaining signal receiving is suppressed to disturb.
In embodiments of the present invention, by according to the variation of the position of receiving terminal and external environment, adjust filter threshold and signal threshold value, the pressing type of removing arrowband by filter threshold disturbs, the pressing type of removing broadband by obtaining interference-cancelled signals disturbs, and by signal threshold value, determines whether signal is that deception formula is disturbed.So do not know in advance the feature of interference, also can suppress to disturb, the pressing type that can suppress broadband disturbs, and has also considered the position of receiving terminal and the variation of external environment, can effectively suppress deception formula and disturb.
Embodiment 3
As shown in Figure 3, the embodiment of the present invention provides a kind of equipment that suppresses interference, comprising:
Adjusting module 301, for according to the position at receiving terminal place and external environment and signal propagation errors factor, adjusts filter threshold and signal threshold value;
The first removal module 302, disturbs as arrowband type for the pressing type when signal, by window function, intercepts this signal, removes the pressing type interference that frequency spectrum surpasses filter threshold from the signal of this intercepting;
Second removes module 303, for the pressing type when this signal, disturbs as wide-band type, obtains interference-cancelled signals, and utilizes interference-cancelled signals from this signal, to remove pressing type and disturb;
Determination module 304, for according to signal threshold value, determines whether this signal is that deception formula is disturbed, and if so, abandons this signal, and if not, this signal is normal signal.
Wherein, the position at receiving terminal place at least comprises longitude and latitude and height above sea level, the external environment at receiving terminal place at least comprises air humidity and obstacle around, signal propagation errors factor at least comprises ionosphere and tropospheric refraction, and signal threshold value at least comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope;
Correspondingly, adjusting module 301 specifically comprises:
The first adjustment unit, for according to the variation of ionosphere, tropospheric refraction and/or height above sea level, the size of Modulating Power scope;
The second adjustment unit, for according to the variation of longitude and latitude, height above sea level, ionosphere and/or tropospheric refraction, adjust the size that arrives time range:
The 3rd adjustment unit, for according to the variation of ionosphere, tropospheric refraction, longitude and latitude and/or height above sea level, adjusts the size that arrives angular range;
The 4th adjustment unit, for according to the variation of longitude and latitude, ionosphere, tropospheric refraction and/or air humidity, adjusts the size of described navigational parameter scope; ,
The 5th adjustment unit, for according to the variation of ionosphere, tropospheric refraction, peripheral obstacle and/or air humidity, adjusts the size of filter threshold.
First removes module 302 specifically comprises:
Interception unit, for intercept the signal receiving by window function, and carries out FFT conversion to the signal of intercepting and obtains spectrum signal;
The first removal unit, the pressing type that surpasses filter threshold for remove frequency spectrum from this spectrum signal disturbs;
Obtain unit, for according to trend and the slope of removing the spectrum signal spectral line of pressing type interference, match a spectrogram with the spectrogram of having stored, the spectrogram mating of take carries out linear interpolation as reference, obtains reconstruction signal;
Compensating unit, for utilizing the reconstruction signal compensation of acquisition to remove the spectrum signal that pressing type disturbs;
Converter unit, for the spectrum signal of compensation is carried out to IFFT conversion, obtains carrying the signal of getting;
Second removes module 303 specifically comprises:
Extraction unit, for extracting characteristic parameter from signal, characteristic parameter at least comprises variance, average, frequency and cycle;
Linear matched unit, for carrying out linear matched by characteristic parameter and the signal characteristic of having stored, produces interference-cancelled signals;
The second removal unit, for this interference-cancelled signals is carried out to adaptive-filtering, then is added to this interference-cancelled signals after adaptive-filtering in signal, and the pressing type of removing in signal disturbs.
Determination module 304 specifically comprises:
The first judging unit, for judging whether the power of signal is the value in power bracket, if not, signal is that deception formula is disturbed, and abandons signal;
The second judging unit, for if the value in power bracket judges whether is the value within the scope of the time of advent time of advent of signal, if not, signal is that deception formula is disturbed, and abandons signal;
The 3rd judging unit, for if the value within the scope of the time of advent, judges whether the arrival angle of signal is the value arriving in angular range, and if not, signal is that deception formula is disturbed, and abandons signal;
The 4th judging unit, for if arrive the value in angular range, judges whether the navigational parameter of signal is the value within the scope of navigational parameter, and if not, signal is that deception formula is disturbed, and abandons signal; If so, signal is the normal signal from satellite;
Further, the equipment that this inhibition is disturbed also comprises:
Receiver module, for receiving a plurality of signals, the signal of reception is at least four; Whether the signal to noise ratio that judges each signal surpasses default threshold value; If surpass the number of the signal of this threshold value, be at least four, will not surpass the signal balancing of this threshold value, and record do not surpass the direction of the signal of this threshold value; If surpass the number of the signal of this threshold value, be less than four, abandon the signal of all receptions, adjust the gain of the main lobe of antenna diagram, utilize main lobe again to receive signal.
In embodiments of the present invention, by according to the variation of the position of receiving terminal and external environment, adjust filter threshold and signal threshold value, the pressing type of removing arrowband by filter threshold disturbs, the pressing type of removing broadband by obtaining interference-cancelled signals disturbs, and by signal threshold value, determines whether signal is that deception formula is disturbed.So do not know in advance the feature of interference, also can suppress to disturb, the pressing type that can suppress broadband disturbs, and has also considered the position of receiving terminal and the variation of external environment, can effectively suppress deception formula and disturb.
All or part of content in the technical scheme that above embodiment provides can realize by software programming, and its software program is stored in the storage medium can read, storage medium for example: the hard disk in computer, CD or floppy disk.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. suppress a method of disturbing, it is characterized in that, described method comprises:
According to the position at receiving terminal place and external environment and signal propagation errors factor, adjust filter threshold and signal threshold value;
Pressing type in signal disturbs as arrowband type, by window function, intercepts described signal, removes the pressing type interference that frequency spectrum surpasses described filter threshold from the signal of described intercepting;
Pressing type in described signal disturbs as wide-band type, obtains interference-cancelled signals, and utilizes described interference-cancelled signals from described signal, to remove pressing type and disturb;
According to described signal threshold value, determine whether described signal is that deception formula is disturbed, and if so, abandons described signal, and if not, described signal is normal signal;
Wherein, describedly by window function, intercept described signal, from the signal of described intercepting, remove the pressing type that frequency spectrum surpasses described filter threshold and disturb, specifically comprise:
By described window function, intercept described signal, and the signal of described intercepting is carried out to fast fourier transform obtain spectrum signal;
From described spectrum signal, remove frequency spectrum over the pressing type interference of described filter threshold;
In the spectrum signal disturbing according to described removal pressing type, trend and the slope of spectral line, match a spectrogram with the spectrogram of having stored, and take the spectrogram of described coupling as with reference to carrying out linear interpolation, obtains reconstruction signal;
Utilize described reconstruction signal to compensate the spectrum signal that described removal pressing type disturbs;
The spectrum signal of described compensation is carried out to inverse Fourier transform, obtain the signal of described intercepting.
2. the method for claim 1, it is characterized in that, the position at described receiving terminal place at least comprises longitude and latitude and height above sea level, the external environment at described receiving terminal place at least comprises air humidity and obstacle around, described signal propagation errors factor at least comprises ionosphere and tropospheric refraction, and described signal threshold value at least comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope;
Correspondingly, described according to the position at receiving terminal place and external environment and signal propagation errors factor, adjust filter threshold and signal threshold value, specifically comprise:
According to the variation of described ionosphere, described tropospheric refraction and/or described height above sea level, adjust the size of described power bracket;
According to the variation of described longitude and latitude, described height above sea level, described ionosphere and/or described tropospheric refraction, adjust the size of described time of advent of scope;
According to the variation of described ionosphere, described tropospheric refraction, described longitude and latitude and/or described height above sea level, adjust the size of described arrival angular range;
According to the variation of described longitude and latitude, described ionosphere, described tropospheric refraction and/or described air humidity, adjust the size of described navigational parameter scope;
According to the variation of described ionosphere, described tropospheric refraction, described peripheral obstacle and/or described air humidity, adjust the size of described filter threshold.
3. the method for claim 1, is characterized in that, described in obtain interference-cancelled signals, and utilize described interference-cancelled signals from described signal, to remove pressing type and disturb, specifically comprise:
From described signal, extract characteristic parameter, described characteristic parameter at least comprises variance, average, frequency and cycle;
By described characteristic parameter and the signal characteristic of having stored, carry out linear matched, produce and disturb relevant interference-cancelled signals to described pressing type;
Described interference-cancelled signals is carried out to adaptive-filtering, the more described interference-cancelled signals after adaptive-filtering is added in described signal, the pressing type of removing in described signal disturbs.
4. the method for claim 1, is characterized in that, described according to described signal threshold value, determines whether described signal is that deception formula is disturbed, and if so, abandons described signal, and if not, described signal is normal signal, specifically comprises:
Whether the power that judges described signal is the value in described power bracket, and if not, described signal is that deception formula is disturbed, and abandons described signal;
If the value in described power bracket judges whether is the value within the scope of the described time of advent time of advent of described signal, if not, described signal is that deception formula is disturbed, and abandons described signal;
If the value within the scope of the described time of advent judges whether the arrival angle of described signal is the value in described arrival angular range, if not, described signal is that deception formula is disturbed, and abandons described signal;
If the value in described arrival angular range judges whether the navigational parameter of described signal is the value within the scope of described navigational parameter, if not, described signal is that deception formula is disturbed, and abandons described signal; If so, described signal is the normal signal from satellite.
5. method as claimed in claim 2, is characterized in that, described according to the position at receiving terminal place and external environment and signal propagation errors factor, after adjusting filter threshold and signal threshold value, also comprises:
Receive a plurality of signals, described signal is at least four;
Whether the signal to noise ratio that judges described signal surpasses default threshold value;
If surpass the number of the signal of described threshold value, be at least four, will not surpass the signal balancing of described threshold value, and record do not surpass the direction of the signal of described threshold value;
If surpass the number of the signal of described threshold value, be less than four, abandon all described signals, adjust the gain of the main lobe of antenna diagram, utilize described main lobe again to receive signal.
6. suppress the equipment disturbing, it is characterized in that, described equipment comprises:
Adjusting module, for according to the position at receiving terminal place and external environment and signal propagation errors factor, adjusts filter threshold and signal threshold value;
The first removal module, disturbs as arrowband type for the pressing type when signal, by window function, intercepts described signal, removes the pressing type interference that frequency spectrum surpasses described filter threshold from the signal of described intercepting;
Second removes module, for the pressing type when described signal, disturbs as wide-band type, obtains interference-cancelled signals, and utilizes described interference-cancelled signals from described signal, to remove pressing type and disturb;
Determination module, for according to described signal threshold value, determines whether described signal is that deception formula is disturbed, and if so, abandons described signal, and if not, described signal is normal signal;
Described first removes module specifically comprises:
Interception unit, for intercepting described signal by described window function, and carries out fast fourier transform to the signal of described intercepting and obtains spectrum signal;
The first removal unit, the pressing type that surpasses described filter threshold for remove frequency spectrum from described spectrum signal disturbs;
Obtain unit, trend and slope for the spectrum signal spectral line that disturbs according to described removal pressing type, match a spectrogram with the spectrogram of having stored, and take the spectrogram of described coupling as with reference to carrying out linear interpolation, obtains reconstruction signal;
Compensating unit, for utilizing described reconstruction signal to compensate the spectrum signal that described removal pressing type disturbs;
Converter unit, for the spectrum signal of described compensation is carried out to inverse Fourier transform, obtains the signal of described intercepting.
7. equipment as claimed in claim 6, it is characterized in that, the position at described receiving terminal place at least comprises longitude and latitude and height above sea level, the external environment at described receiving terminal place at least comprises air humidity and obstacle around, described signal propagation errors factor at least comprises ionosphere and tropospheric refraction, and described signal threshold value at least comprises power bracket, time of advent scope, arrives angular range or navigational parameter scope;
Correspondingly, described adjusting module specifically comprises:
The first adjustment unit, for according to the variation of described ionosphere, described tropospheric refraction and/or described height above sea level, adjusts the size of described power bracket;
The second adjustment unit, for according to the variation of described longitude and latitude, described height above sea level, described ionosphere and/or described tropospheric refraction, adjusts the size of described time of advent of scope;
The 3rd adjustment unit, for according to the variation of described ionosphere, described tropospheric refraction, described longitude and latitude and/or described height above sea level, adjusts the size of described arrival angular range;
The 4th adjustment unit, for according to the variation of described longitude and latitude, described ionosphere, described tropospheric refraction and/or described air humidity, adjusts the size of described navigational parameter scope;
The 5th adjustment unit, for according to the variation of described ionosphere, described tropospheric refraction, described peripheral obstacle and/or described air humidity, adjusts the size of described filter threshold.
8. equipment as claimed in claim 6, is characterized in that, described second removes module specifically comprises:
Extraction unit, for extracting characteristic parameter from described signal, described characteristic parameter at least comprises variance, average, frequency and cycle; ,
Linear matched unit, for carrying out linear matched by described characteristic parameter and the signal characteristic of having stored, produces and disturbs relevant interference-cancelled signals to described pressing type;
The second removal unit, for described interference-cancelled signals is carried out to adaptive-filtering, then is added to the described interference-cancelled signals after adaptive-filtering in described signal, and the pressing type of removing in described signal disturbs;
Described determination module specifically comprises:
The first judging unit, for judging whether the power of described signal is the value in described power bracket, if not, described signal is that deception formula is disturbed, and abandons described signal;
The second judging unit, for if the value in described power bracket judges whether is the value within the scope of the described time of advent time of advent of described signal, if not, described signal is that deception formula is disturbed, and abandons described signal;
The 3rd judging unit, for if the value within the scope of the described time of advent judges whether the arrival angle of described signal is the value in described arrival angular range, if not, described signal is that deception formula is disturbed, and abandons described signal;
The 4th judging unit, for if the value in described arrival angular range judges whether the navigational parameter of described signal is the value within the scope of described navigational parameter, if not, described signal is that deception formula is disturbed, and abandons described signal; If so, described signal is the normal signal from satellite.
9. equipment as claimed in claim 6, is characterized in that, described equipment also comprises:
Receiver module, for receiving a plurality of signals, described signal is at least four; Whether the signal to noise ratio that judges described signal surpasses default threshold value; If surpass the number of the signal of described threshold value, be at least four, will not surpass the signal balancing of described threshold value, and record do not surpass the direction of the signal of described threshold value; If surpass the number of the signal of described threshold value, be less than four, abandon all described signals, adjust the gain of the main lobe of antenna diagram, utilize described main lobe again to receive signal.
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| CN103197292B (en) * | 2013-04-03 | 2015-12-02 | 北京华清瑞达科技有限公司 | The generation of Multichannel radar analogue echoes signal and verification method |
| CN103336285B (en) * | 2013-07-02 | 2015-04-08 | 江苏指南针导航通信技术有限公司 | Circuit and method for detecting false satellite navigation signal and satellite navigation receiving equipment |
| CN103760530B (en) * | 2014-01-15 | 2016-02-10 | 西安电子科技大学 | Based on radar suppress interfere and the Deceiving interference recognition methods of signal cone |
| CN104393883B (en) * | 2014-11-01 | 2017-03-15 | 中国民航大学 | ADS B pressing type disturbance restraining methods based on improved power inversion method |
| CN105911566A (en) * | 2016-04-13 | 2016-08-31 | 中国电子科技集团公司第五十四研究所 | Deception jamming detection method |
| CN107872268A (en) * | 2016-09-26 | 2018-04-03 | 北京大学（天津滨海）新代信息技术研究院 | A kind of method that interference is eliminated for satellite communication system |
| CN107171693B (en) * | 2017-04-25 | 2019-03-26 | 西安电子科技大学 | Broadband interference suppressing method based on Waveform Reconstructing |
| CN109960252B (en) * | 2017-12-25 | 2022-05-06 | 深圳市优必选科技有限公司 | Robot and data processing method thereof |
| CN109286421B (en) * | 2018-09-13 | 2021-03-26 | 上海垣信卫星科技有限公司 | Comprehensive anti-interference method and system for processing satellite communication signals |
| CN109655794B (en) * | 2018-11-14 | 2020-09-08 | 上海无线电设备研究所 | Detection and identification method for suppressing interference by narrow-band self-defense noise |
| CN109815877B (en) * | 2019-01-17 | 2020-10-02 | 北京邮电大学 | Noise reduction processing method and device for satellite signals |
| CN111366950B (en) * | 2020-05-31 | 2020-08-28 | 湖南跨线桥航天科技有限公司 | Comprehensive detection method and system for satellite navigation suppression type interference and deception interference |
| CN115951374B (en) * | 2023-03-13 | 2023-05-19 | 钛玛科（北京）工业科技有限公司 | Signal interference suppression method |
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