CN205157787U - Mix satellite navigation anti jamming unit - Google Patents
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- CN205157787U CN205157787U CN201520843751.XU CN201520843751U CN205157787U CN 205157787 U CN205157787 U CN 205157787U CN 201520843751 U CN201520843751 U CN 201520843751U CN 205157787 U CN205157787 U CN 205157787U
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Abstract
The utility model provides a mix satellite navigation anti jamming unit, frequency conversion module is gone up in frequency conversion module, the anti interruption module of navigation and simulation down including the antenna array that connects in order, simulation for it, antenna array be used for with the mixed satellite navigation signal of received do low noise amplification handle the back carry give the simulation down frequency conversion module make the down coversion and handle, carry the anti interruption module of navigation after being about to radiofrequency signal frequency conversion to intermediate frequency, navigate anti interruption module to the intermediate frequency mix the navigation signal go on two dimension when empty anti interference filtration handle the back transmission and go up frequency conversion module for the simulation to make the up -conversion and handle, received 0 frequency conversion is soon exported to radiofrequency signal, its adopts when empty under the anti -interference mode of normal direction restraint and to lead the vector restraint for the carrier wave of the wideest navigation signal of bandwidth point frequently with the time domain for the event multisystem that realizes holding concurrently in the middle of the wave filter main lobe when navigation signal of different frequency channels is avoided trapped wave point and can all be located the sky is navigated anti -interferencely, it extensively is applicable to, and various mixed satellite navigation equipment are supporting to be used.
Description
Technical field
The utility model relates to a kind of mixed satellite navigation means for anti-jamming.
Background technology
Along with satellite navigation system deployment in the world, the receiver of compatible multiple navigation standard becomes the focus studied at present already; Because the satellite-signal arriving user terminal is very faint, often be submerged under noise, and be easily subject to complicated electromagnetic environment interference and artificial interference, therefore the receiver Anti-Jamming Technique of compatible multi-satellite navigation system progressively becomes a gordian technique of Receiver Design.
Present satellites navigation Anti-Jamming Technique, often based on array antenna Anti-Jamming Technique, divides again one-dimensional territory and plu-ral-dimensional domain other; The array antenna Anti-Jamming Technique in one-dimensional territory is pure spatial domain Anti-Jamming Technique, this technology only rely on interference with signal come to, when disturbing to when distinguishing larger with satellite-signal to spatial domain, spatial domain Anti-Jamming Technique has good performance, otherwise just can not accomplish effective differentiation; Combine for this reason time domain, frequency domain, polarizing field two-dimentional Federated filter effectively can make up the deficiency of simple airspace filter, above-mentioned plu-ral-dimensional domain associating Anti-Jamming Technique in the middle of, space-time two-dimensional associating Anti-Jamming Technique application comparatively extensive.
Space-time two-dimensional associating Anti-Jamming Technique in, usually select following two kinds of restriction modes: Normal Constraint immunity mode and without constraint immunity mode, described Normal Constraint immunity mode: this mode of operation is using the maximum direction of the normal direction of antenna array plane as antenna array gain, position is fallen into self-adaptative adjustment antenna array zero according to interference, suppress undesired signal adaptively, the array pattern of aerial array under Normal Constraint has narrower main lobe and larger main lobe gain, therefore when receiving high elevation angle satellite-signal, there is some superiority, but be difficult to receive the lower satellite-signal of the angle of pitch, total star number of receiving is caused to be fallen now, especially when antenna array run-off the straight, receive star situation can worsen further, and then have influence on interference free performance, described without constraint immunity mode: this mode of operation makes total output power minimum being but unlikely to be zero under the single array element gain of guarantee is the constraint condition of constant, restrained bay is often called as main antenna, all the other antennas are called as slave antenna, the feature that its array pattern has main lobe wider compared with Normal Constraint immunity mode, but Array Method to gain not as good as Normal Constraint immunity mode, at nothing constraint immunity mode, the satellite-signal that the angle of pitch is lower can be received, receipts star number order has some superiority.
Be directed to multisystem navigation anti-interference, no matter all there is certain technological deficiency without constraint immunity mode when Normal Constraint immunity mode or sky when being sky; This is due to for multisystem navigation signal, the navigation signal of different navigation standard is spaced apart among whole signal envelope, and as triangular web navigation signal, be not positioned at the center of whole signal envelope, space-time filtering technology traditional is again owing to introducing time-domain filtering, certain trap frequency point can be produced on overall filtering output spectrum, therefore when using empty to multisystem during Normal Constraint immunity mode, be difficult to make its time domain trap frequency point avoid the frequency of useful signal well, filtering can be received star to system and be caused serious loss in this way; If to avoid the frequency trap of time-domain filtering in the middle of the main lobe making the overall bandwidth of hybrid navigation signal be positioned at time domain filtering, then the exponent number of space-time filtering then should significantly reduce to cater to wider bandwidth, the decline of the frequency resolution of space-time filtering can be caused in this way, and then affect the performance of space-time filtering; Again for during sky without constraint immunity mode for, although not as violent under Normal Constraint immunity mode time empty in time domain trap degree, but the linear phase characteristic of its time domain filtering has a little gap compared with Normal Constraint, moreover, owing to adopting constraint main antenna gain be the constraint condition of constant and make total output power minimum without constraint immunity mode during sky, therefore when main antenna breaks down, system just cannot ensure to receive star work normally, subversiveness will be brought to affect to system.
Patent of invention 201310275142.4 discloses a kind of space-time adaptive filter processing method, it is by the smoothing processing to space-time adaptive filter factor, decrease the fluctuation of coefficient, the data that space-time filtering device is exported are more steady, improve the reliability of system, but not too applicable to the jamproof process of navigating of multisystem mixed satellite.
Summary of the invention
For above-mentioned situation, the utility model object is to provide a kind of mixed satellite navigation means for anti-jamming, it can when sky under Normal Constraint immunity mode by the adjustment to the constraint of time domain steering vector, realize in the middle of the different main lobes making the navigation signal of different systems lay respectively at space-time filtering device not loss system frequency resolution when to hold concurrently therefore multisystem navigation is anti-interference; And one-piece construction is scientific and reasonable, install and easy to operate, low cost of manufacture, non-environmental-pollution, is easy to promote the popularization use.
For realizing above-mentioned task, a kind of mixed satellite navigation means for anti-jamming, it comprises the aerial array, analog down module, navigation immunity module and the simulation up-converter module that connect in turn; Described aerial array flows to analog down module after being used for that the mixed satellite navigation signal received is done low noise amplification process and makes down-converted, navigation immunity module is transported to after being converted to intermediate frequency by radiofrequency signal, described navigation immunity module to intermediate frequency hybrid navigation signal carry out two dimension empty time anti-interference filtration process after be transferred to simulation up-converter module and make upconversion process, be converted to radiofrequency signal by intermediate-freuqncy signal and export.
For realizing the utility model structure, effect optimization, its further step: described navigation immunity module comprises the analog-to-digital conversion module, space-time adaptive filtering processing module and the D/A converter module that connect in turn; Described analog-to-digital conversion module carries out modulus A/D sampling according to sample frequency to intermediate frequency hybrid navigation signal and is converted to digital signal respectively, time domain steering vector is constrained to the carrier frequency point of the widest navigation signal of bandwidth by described space-time adaptive filtering processing module under constraint condition at spatial domain method to digital signal, and anti-interference filtration process time empty to digital signal work two dimension according to the space-time filtering parameter area selected, the digital signal after anti-interference filtration during sky two-dimentional to work is converted to simulating signal through digital-to-analogue D/A and exports by described D/A converter module.
Described aerial array comprises four bays and low noise amplifier, and described four bays are connected with low noise amplifier respectively.
Described analog-to-digital conversion module is connected for carrying out bandpass filtering treatment to the intermediate frequency hybrid navigation signal being converted to digital signal with the outer undesired signal of filter out-band with space-time adaptive filtering processing module through bandpass filter.
The utility model also provides a kind of mixed satellite navigation anti-interference method, and it comprises the following steps:
A. low noise amplification process is done to the signal of antenna array receiver;
B. down-converted is done to the Received signal strength after low noise amplification process, radiofrequency signal is converted to intermediate frequency;
C. according to sample frequency, modulus A/D is carried out to intermediate frequency hybrid navigation signal and change sampling, and make bandpass filtering treatment with the outer undesired signal of filter out-band;
D. under constraint condition, time-domain constraints is carried out to intermediate frequency hybrid navigation signal at spatial domain method, and determine space-time filtering parameter area;
E. the time-domain constraints in above step and space-time filtering parameter are to anti-interference filtration during intermediate frequency hybrid navigation signal work two dimension sky;
F. carry out digital-to-analogue D/A to filtered data-signal change rear and export;
G. as upconversion process, radiofrequency signal is converted to simulating signal and exports to navigation neceiver.
Described step c comprises definite frequency range to intermediate frequency hybrid navigation signal determination different navigation signal and center frequency point, according to center frequency point determination sample frequency.
Described steps d comprises carrier frequency point time domain steering vector being constrained to the widest navigation signal of bandwidth, and determine space-time filtering parameter area, the i.e. usable range of time delay T between number of taps N and tap, and space-time filtering parameter area is finely tuned, make the navigation signal of different frequency range avoid trap wave point and can all be positioned in the middle of space-time filtering device main lobe.
Time empty to intermediate frequency hybrid navigation signal work two dimension in described step e, after anti-interference filtration, the final output signal of space-time filtering device can be expressed as:
The beneficial effect that the utility model is produced compared to existing technology:
I, the utility model adopts carrier frequency point time domain steering vector being constrained to the widest navigation signal of bandwidth, and finely tune in the scope that space-time filtering parameter is selected, making the navigation signal of different frequency range avoid trap wave point can all be positioned in the middle of space-time filtering device main lobe, trap frequency point when to avoid sky when not loss system frequency resolution can be ensured, and hold concurrently therefore multisystem satellite navigation anti-interference process;
II, the utility model adopts carrier frequency point time domain steering vector being constrained to the widest navigation signal of bandwidth, and finely tune in the scope that space-time filtering parameter is selected, making the navigation signal of different frequency range avoid trap wave point can all be positioned in the middle of space-time filtering device main lobe, can effectively avoid using the problem without the navigation signal single point failure stability deficiency under constraint immunity mode;
III, the utility model adopts carrier frequency point time domain steering vector being constrained to the widest navigation signal of bandwidth, and finely tune in the scope that space-time filtering parameter is selected, making the navigation signal of different frequency range avoid trap wave point can all be positioned in the middle of space-time filtering device main lobe, system filter can be made to output signal there is good inband flatness, be convenient to navigation neceiver and signal is resolved and analyzes;
IV, the utility model to adopt when sky under Normal Constraint immunity mode by the adjustment to the constraint of time domain steering vector, realize in the middle of the different main lobes making the navigation signal of different systems lay respectively at space-time filtering device not loss system frequency resolution when to hold concurrently therefore multisystem navigation is anti-interference; And one-piece construction is scientific and reasonable, to install and easy to operate, low cost of manufacture, filtered output signals steadily, improves the reliability of system, wide market, is convenient to promote the use of.
The utility model is widely used in various mixed satellite navigator and supports the use.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming the application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.
Fig. 1 is hardware connection structure schematic diagram of the present utility model.
Self application filter structure schematic diagram when Fig. 2 is the utility model sky.
Fig. 3 is the system time domain trap spectrogram under existing normal mode N=2, T=4 condition at one's leisure.
Normal mode N=2, T=4 when Fig. 4 is the present embodiment hollow, the space-time filtering output spectrum figure of time domain steering vector constraint BD2B1 carrier frequency point.
Embodiment
As shown in Figure 1, the utility model provides a kind of mixed satellite navigation means for anti-jamming, and it comprises the aerial array, analog down module, navigation immunity module and the simulation up-converter module that connect in turn; Described aerial array flows to analog down module after being used for that the mixed satellite navigation signal received is done low noise amplification process and makes down-converted, navigation immunity module is transported to after being converted to intermediate frequency by radiofrequency signal, described navigation immunity module to intermediate frequency hybrid navigation signal carry out two dimension empty time anti-interference filtration process after be transferred to simulation up-converter module and make upconversion process, be converted to radiofrequency signal by intermediate-freuqncy signal and export; Described navigation immunity module comprises the analog-to-digital conversion module, space-time adaptive filtering processing module and the D/A converter module that connect in turn; Described analog-to-digital conversion module carries out modulus A/D sampling according to sample frequency to intermediate frequency hybrid navigation signal and is converted to digital signal respectively, time domain steering vector is constrained to the carrier frequency point of the widest navigation signal of bandwidth by described space-time adaptive filtering processing module under constraint condition at spatial domain method to digital signal, and anti-interference filtration process time empty to digital signal work two dimension according to the space-time filtering parameter area selected, the digital signal after anti-interference filtration during sky two-dimentional to work is converted to simulating signal through digital-to-analogue D/A and exports by described D/A converter module; Described aerial array comprises four bays and low noise amplifier, and described four bays are connected with low noise amplifier respectively; Described analog-to-digital conversion module is connected for carrying out bandpass filtering treatment to the intermediate frequency hybrid navigation signal being converted to digital signal with the outer undesired signal of filter out-band with space-time adaptive filtering processing module through bandpass filter.
As shown in Figure 2, the final output signal of space-time filtering device of the present utility model can be expressed as:
Wherein, W represents the weight vector of space-time filtering device, and X is that MN × 1 receives data vector, and M is array element number, and N is time-domain taps number; Set again time delay between tap as T (T be the positive integer in system sampling clock cycle doubly), then the difference equation of this system can be expressed as:
y(k)＝W
11x
1(k)+W
12x
1(k-T)+...+W
1Nx
1(k-NT)+
W
21x
2(k)+W
22x
2(k-T)+...+W
2Nx
2(k-NT)+...+
W
M1x
M(k)+W
M2x
M(k-T)+...+W
MNx
M(k-NT)
Owing to all doing same time domain delay process for the signal received by the bay of every road, Xian Qu mono-road signal does time-domain analysis, and the system difference equation be simplified in this way can be rewritten as:
y(k)＝W
1x(k)+W
2x(k-T)+...+W
Nx(k-NT)
Do transform (being transformed to the expression formula at complex frequency domain by time-domain signal discrete-time series) can obtain:
Y(z)＝W
1X(z)+W
2X(z)z
-T+...+W
NX(z)z
-NT
＝X(z)(W
1+W
2z
-T+...+W
Nz
-NT)
Obtaining Z domain system function is:
From Z domain system function, this system top step number is N × T, be time delay number T between number of taps N and tap long-pending, system will have N × T multiple pole at true origin place, by point submultinomial this system known, there is N × T zero point, namely on [0, Fs] interval, have N × T trap wave point, wherein Fs is sample frequency; Determined the number of main lobe in amplitude-frequency response by the known T of system function formula, i.e. total T main lobe in sample frequency [0, Fs], and tap number N determines the number at zero point between main lobe; Along with the rising of total exponent number, the trap frequency number in sample frequency Fs significantly increases, frequency discrimination performance enhancement; Phase-frequency characteristic response between every two zero points meets linear phase relation, and while wave filter main lobe gain increases, main lobe bandwidth narrows to some extent; For navigation signal, this main lobe bandwidth should be greater than the bandwidth of navigation signal, otherwise will produce obvious trap in frequency band, and linear phase also will be destroyed, and will produce certain impact to the correlation demodulation of rear end navigation signal.
As shown in Figure 3, traditional empty time normal mode N=2, immunity mode filtering is done to the overall signal of mixing different navigation standard under T=4 condition, overall bandwidth due to mixed signal is greater than the main lobe bandwidth of system filter, cause producing obvious trap in frequency band, linear phase also will be destroyed, will have an impact to the correlation demodulation of rear end navigation signal, therefore be difficult to the hybrid navigation signal taking into account all frequency bands.
By reference to the accompanying drawings, embodiment 1 of the present utility model: adopt satellite navigation system to be GPSL1 frequency and BD2B1 frequency commingled system, the frequency band range of satellite navigation signals is 1.559098GHz ~ 1.57642GHz, and bay number is 4; Carry out anti-interference processing method to satellite navigation signals to comprise the following steps:
1) low noise amplification process is done to antenna array receiver signal;
2) down-converted is done to the Received signal strength after low noise amplification process, radiofrequency signal is converted to intermediate frequency;
3) determine that GPSL1 frequency signal be 54.25MHz ± 1MHz, BD2B1 frequency signal is 39.75MHz ± 2MHz, hybrid navigation signal center frequency is 47MHz; Because the navigation signal carrier frequency of GPSL1 and BD2B1 two kinds of standards is close, only there is 14.5MHz at interval, and hybrid navigation signal center frequency is 47MHz, therefore with the sample frequency of 61.5MHz, modulus A/D sampling is carried out to hybrid navigation signal and be converted to digital signal respectively, and make bandpass filtering treatment with the outer undesired signal of filter out-band;
4) due to GPSL1 signal bandwidth 2MHz, BD2B1 signal bandwidth 4MHz, be BD2B1 carrier frequency point 39.75MHz by time-domain constraints at spatial domain method under constraint condition, and determine space-time filtering Parameter N=2, T=4;
5) time-domain constraints in above step and space-time filtering Parameter N=2, T=4 to intermediate frequency hybrid navigation signal do two dimension empty time anti-interference filtration process, be illustrated in figure 4 the output spectrum figure after anti-interference filtration process, as can be seen from Figure 4 BD2B1 frequency signal 39.75MHz ± 2MHz and GPSL1 frequency signal 54.25MHz ± 1MHz lays respectively in the middle of the different main lobes of space-time filtering frequency characteristic, and when can effectively avoid tradition empty, under normal direction immunity mode, filtering is lost the trap of many navigational system signal;
6) carry out exporting after digital-to-analogue D/A is converted to simulating signal to filtered data-signal;
7) as upconversion process, radiofrequency signal is converted to simulating signal and exports to navigation neceiver.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations; All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. a mixed satellite navigation means for anti-jamming, is characterized in that comprising the aerial array, analog down module, navigation immunity module and the simulation up-converter module that connect in turn; Described aerial array flows to analog down module after being used for that the mixed satellite navigation signal received is done low noise amplification process and makes down-converted, navigation immunity module is transported to after being converted to intermediate frequency by radiofrequency signal, described navigation immunity module to intermediate frequency hybrid navigation signal carry out two dimension empty time anti-interference filtration process after be transferred to simulation up-converter module and make upconversion process, be converted to radiofrequency signal by intermediate-freuqncy signal and export.
2. mixed satellite navigation means for anti-jamming according to claim 1, is characterized in that described navigation immunity module comprises analog-to-digital conversion module, space-time adaptive filtering processing module and the D/A converter module connected in turn; Described analog-to-digital conversion module carries out modulus A/D sampling according to sample frequency to intermediate frequency hybrid navigation signal and is converted to digital signal respectively, time domain steering vector is constrained to the carrier frequency point of the widest navigation signal of bandwidth by described space-time adaptive filtering processing module under constraint condition at spatial domain method to digital signal, and anti-interference filtration process time empty to digital signal work two dimension according to the space-time filtering parameter area selected, the digital signal after anti-interference filtration during sky two-dimentional to work is converted to simulating signal through digital-to-analogue D/A and exports by described D/A converter module.
3. mixed satellite navigation means for anti-jamming according to claim 1, it is characterized in that described aerial array comprises four bays and low noise amplifier, described four bays are connected with low noise amplifier respectively.
4. mixed satellite navigation means for anti-jamming according to claim 2, is characterized in that described analog-to-digital conversion module is connected for carrying out bandpass filtering treatment to the intermediate frequency hybrid navigation signal being converted to digital signal with the outer undesired signal of filter out-band with space-time adaptive filtering processing module through bandpass filter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646528A (en) * | 2016-11-03 | 2017-05-10 | 中国科学院云南天文台 | System and method of eliminating interference on navigation signals by solar radio burst based on auxiliary antenna |
| CN108226963A (en) * | 2016-12-22 | 2018-06-29 | 法国国家太空研究中心 | The GNSS receiver of the simplification with improved precision in perturbation environment |
| CN108519608A (en) * | 2018-03-09 | 2018-09-11 | 中国航天电子技术研究院 | A kind of satellite navigation based on array antenna is anti-interference and surveys attitude positioning method |
| CN109116377A (en) * | 2018-07-26 | 2019-01-01 | 中国电子科技集团公司第五十四研究所 | A kind of satellite navigation anti-interference method and device calculated based on time domain submatrix |
-
2015
- 2015-10-27 CN CN201520843751.XU patent/CN205157787U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646528A (en) * | 2016-11-03 | 2017-05-10 | 中国科学院云南天文台 | System and method of eliminating interference on navigation signals by solar radio burst based on auxiliary antenna |
| CN108226963A (en) * | 2016-12-22 | 2018-06-29 | 法国国家太空研究中心 | The GNSS receiver of the simplification with improved precision in perturbation environment |
| CN108226963B (en) * | 2016-12-22 | 2021-12-07 | 法国国家太空研究中心 | Simplified GNSS receiver with improved accuracy in a perturbation environment |
| CN108519608A (en) * | 2018-03-09 | 2018-09-11 | 中国航天电子技术研究院 | A kind of satellite navigation based on array antenna is anti-interference and surveys attitude positioning method |
| CN109116377A (en) * | 2018-07-26 | 2019-01-01 | 中国电子科技集团公司第五十四研究所 | A kind of satellite navigation anti-interference method and device calculated based on time domain submatrix |
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Address after: 414000 Kangwang Industrial Park, Yueyang Economic and Technological Development Zone, Hunan Province Patentee after: Hunan 6906 Information Technology Co.,Ltd. Address before: 414000 Kangwang Industrial Park, Yueyang Economic and Technological Development Zone, Hunan Province Patentee before: GUOXIN JUNCHUANG (YUEYANG) 6906 TECHNOLOGY Co.,Ltd. |
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