CN117031503A - Distributed GNSS interference effectiveness evaluation method - Google Patents
Distributed GNSS interference effectiveness evaluation method Download PDFInfo
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- CN117031503A CN117031503A CN202310805908.9A CN202310805908A CN117031503A CN 117031503 A CN117031503 A CN 117031503A CN 202310805908 A CN202310805908 A CN 202310805908A CN 117031503 A CN117031503 A CN 117031503A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
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- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention discloses a distributed GNSS interference effectiveness evaluation method which comprises seven steps, wherein the method can accurately give out the spatial distribution characteristics of distributed GNSS interference signals. According to the signal characteristics of GNSS interference radiation sources deployed on different nodes, on the basis of obtaining interference radiation source information, the characteristic change of interference signals on the whole electromagnetic wave propagation link from the transmission to the reception of each interference radiation source is completely considered, the estimation of attenuation of electromagnetic waves in the channel propagation process is realized through an electric wave propagation model, and the accurate estimation of GNSS interference coverage is realized by combining the self anti-interference characteristics of an onboard satellite navigation system module or equipment.
Description
Technical Field
The invention belongs to the field of GNSS interference monitoring, and particularly relates to a distributed GNSS interference efficiency evaluation method in the field.
Background
The GNSS interference effectiveness evaluation comprehensively considers factors such as electromagnetic environment, geographic environment, interference radiation source characteristics, deployment point positions, interference frequency bands and the like, and comprehensively analyzes and evaluates GNSS interference effects, so that various satellite navigation applications can obtain quick effect evaluation and alarm response when facing GNSS interference.
The distributed GNSS interference performance estimation refers to: the distributed interference mode is built by utilizing a plurality of interference radiation source nodes deployed in a certain area range, and the essence of the distributed interference mode is that the distributed interference mode is built on the basis of single GNSS interference radiation source efficiency evaluation, and the distributed GNSS interference efficiency evaluation capability is effectively represented by combining the self anti-interference characteristics of the carried satellite navigation system module or equipment through the weighting action of different points.
However, it should be noted that the distributed GNSS interference performance estimation cannot be simply considered as a linear combination of the performance of each interference radiation source, and the placed point location, the transmitting power of the interference radiation source, the interference affecting frequency band, the interference distance, and other factors will all affect the overall distributed GNSS interference performance. Therefore, the conventional single-equipment GNSS interference efficiency evaluation method or the simple linear superposition multi-interference radiation source interference efficiency evaluation method has no characterization capability on uncertainty of electromagnetic environment and target influence characteristics, and cannot accurately consider the distributed GNSS interference efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a distributed GNSS interference efficiency evaluation method.
The invention adopts the following technical scheme:
in a distributed GNSS interference performance estimation method, the improvement comprising the steps of:
step 1, setting deployment point positions (x) of each GNSS interference radiation source i ,y i ) And an interference range to be evaluated, determining deployment point positions (x) of each GNSS interference radiation source according to the interference range to be evaluated i ,y i ) I represents an ith GNSS interference radiation source;
step 2, setting characteristic parameters of each GNSS interference radiation source and antenna gain of each GNSS interference radiation source, wherein the characteristic parameters comprise the emission power of the ith GNSS interference radiation source(unit dBm), interfered GNSS frequency f and gain of transmitting antenna of ith GNSS interference radiation source>Information such as (unit dBi);
step 3, respectively calculating attenuation values on the electromagnetic wave propagation channel paths of each GNSS interference radiation source:
after each GNSS interference radiation source interference signal is emitted from the antenna, attenuation in the propagation process of each propagation path becomes complex and changeable due to different natural environment factors (such as topography factors, geographical environment, atmospheric refraction coefficient, earth transmission impedance, earth vegetation type, reflection coefficient and the like) on the propagation path, and the specific propagation mode increases with the increase of the complexity of the radio wave environment. The electromagnetic wave signal is propagated through free space propagation, ground reflection, various diffraction, scattering and other modes, and a special electric wave propagation model is required to be established in the step to analyze the attenuation value on the electromagnetic wave propagation channel path of each GNSS interference radiation source.
The invention calculates by a free space propagation model, and assumes that the electromagnetic wave is in an isotropic, uniform and infinite space without dielectric loss, namely free space when propagating. In this free space, the rays are straight lines, the energy of the wave is not affected by other factors, only the propagation distance is related, the signal is in the range of view, and the propagation loss is mainly caused by the divergence of the energy during propagation.
The free space propagation model is defined as:
in the above-mentioned method, the step of,representing propagation attenuation value (unit dB) of interference signal of ith GNSS interference radiation source in propagation path, d i A radio wave propagation path length (in km) representing the distance between the ith GNSS interference radiation source and the current grid point;
step 4, respectively calculating the interference-signal ratio of each GNSS interference radiation source on each grid point in the interference range to be evaluated:
assuming that an i-th GNSS interference radiation source transmits interference signals with set power within an interference range to be evaluated, the gains of a transmitting antenna in all directions are the same, namely the omni-directional transmission, and the interference signal ratio can be calculated by combining attenuation values, other relevant losses and the floor power of a GNSS receiver on the path of an electromagnetic wave propagation channel. The whole physical process can be described using the following model:
in the above formula:a signal-to-interference ratio representing an ith GNSS interference radiation source; />Representing other relevant loss values (unit dB) of the ith GNSS interference radiation source; p (P) rec The floor power of the representative GNSS receiver is set to be constant and is generally set to be-125 dBm;
calculating the interference-signal ratio of each GNSS interference radiation source on the current grid point through the formula, and then calculating the interference-signal ratio of all grid points in the interference range to be evaluated in a traversing way;
step 5, synthesizing the anti-interference capability models of different GNSS receivers to give the anti-interference capability of the GNSS receivers under different conditions
The GNSS receivers of different types have different anti-interference capacities, and the GNSS receivers with stronger anti-interference capacities are generally provided with self-adaptive anti-interference zeroing antennas, and meanwhile, the satellite measurement and control link has anti-interference capacity in a spread spectrum system.
Representing the anti-interference capability of the GNSS receiver when the number of the interference radiation sources is k;
step 6, combining the anti-interference capability of GNSS receivers under different conditionsAnd +.>Judging the interfered condition of the current calculation grid point:
judging whether the number of the interference radiation sources is not lower than k and the interference signal ratio exists when the number of the interference radiation sources is k by a traversing modeNot lower than->If yes, stopping traversing, and judging that the current calculation grid point is interfered; if the current calculation grid points are not interfered when the traversal is finished, judging that the current calculation grid points are not interfered;
and 7, traversing the interfered conditions on all grid points in the interference range to be evaluated to obtain the interference effectiveness space distribution characteristics of the whole distributed GNSS interference signal.
The beneficial effects of the invention are as follows:
the method disclosed by the invention can accurately give out the spatial distribution characteristics of the distributed GNSS interference signals. According to the signal characteristics of GNSS interference radiation sources deployed on different nodes, on the basis of obtaining interference radiation source information, the characteristic change of interference signals on the whole electromagnetic wave propagation link from the transmission to the reception of each interference radiation source is completely considered, the estimation of attenuation of electromagnetic waves in the channel propagation process is realized through an electric wave propagation model, and the accurate estimation of GNSS interference coverage is realized by combining the self anti-interference characteristics of an onboard satellite navigation system module or equipment.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a schematic representation of the selected area coverage of example 1;
FIG. 3 is a schematic diagram of the position of the source of interfering radiation in example 1;
fig. 4 is a schematic diagram of interference performance evaluation results of embodiment 1.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In embodiment 1, the present embodiment discloses a distributed GNSS interference performance evaluation method, whose flow is shown in fig. 1, and can quickly implement interference performance area influence range analysis.
The area range selected in this embodiment is shown in fig. 2, the horizontal direction is the X direction range of 0 km-78 km, and the vertical direction is the Y direction range of 0 km-33 km, which is a rectangular area; as shown in FIG. 3, the number of the interference radiation sources is 5, and each interference radiation source is set to transmit an interference signal with the same power, and the transmission power is 50W, namely the interference transmission powerAll 47dBm; the transmitting antenna is omni-directional, the interference transmitting antenna gain is +.>All set to 3dBi; the interference affecting frequency f was 1575.42Mhz; the coordinate positions of the 5 interference radiation sources are respectively as follows: the interference radiation source 1 coordinates (39 km,27 km), the interference radiation source 2 coordinates (23 km,21 km), the interference radiation source 3 coordinates (55 km,21 km), the interference radiation source 4 coordinates (30 km,10 km), the interference radiation source 5 coordinates (50 km,10 km).
According to step 3, attenuation valueCalculation is performed with a free space propagation model, and thus the propagation attenuation values of electric waves at the respective grid points are calculated according to the free space propagation model formula (1)>
Thus, the attenuation value of each interference radiation source reaching each grid point can be calculated
According to step 4, setOther relevant loss is 8dB, P rec Is-125 dBm, combined with the known And +.calculated by equation (1)>Obtaining the interference signal ratio +.f of each GNSS interference radiation source at each grid point in the interference range to be evaluated according to the formula (2)>
Taking a four-array-element adaptive GNSS zeroing antenna as an example according to step 5, the anti-interference capability of the GNSS receiver is assumedAs shown in table 1 below:
TABLE 1
According to step 6, combine differentAnti-jamming capability of GNSS receiver under conditionAnd calculated in step 4And judging the interfered condition of the current calculation grid point. Judging whether the number of the interference radiation sources is not less than 1 and the interference signal ratio is not less than 1 in a traversing way>If the current calculated grid point is not lower than 70, stopping traversing, and judging that the current calculated grid point is interfered; if not, traversing whether the number of the interference radiation sources is not less than 2 and the interference signal ratio is +.>If the current calculated grid point is not lower than 60, stopping traversing, and judging that the current calculated grid point is interfered; if not, traversing whether the number of the interference radiation sources is not less than 3 and the interference signal ratio is not less than 3>If the current calculated grid point is not lower than 50, stopping traversing, and judging that the current calculated grid point is interfered; if not, traversing whether the interference radiation source number is not less than 4 and the interference signal ratio is +.>If the current calculated grid point is not lower than 40, stopping traversing, and judging that the current calculated grid point is interfered; if the current calculation grid point is not satisfied at the end of the traversal, judging that the current calculation grid point is not interfered.
And 7, traversing the interfered condition on each grid point in the interference range to be evaluated to obtain the interference efficiency spatial distribution characteristic of the whole distributed GNSS interference signal. The result of the interference performance evaluation in this embodiment is shown in fig. 4, where black squares represent that the current grid point is interfered, and gray grid points represent that the current grid point is not interfered. According to the point positions of the five interference radiation sources of the embodiment, in combination with the related parameters given by the embodiment, it can be seen that the interference range basically covers the periphery of the interference radiation source and the central zone of the region to be evaluated, which accords with the calculation characteristics of the model of the invention, but other regions far from the interference radiation source are not interfered, which indicates that the single interference signal cannot really influence the performance of the receiver at a far distance. The result of the embodiment accords with the natural law and the spatial distribution characteristic of the distributed GNSS interference efficiency.
The embodiment specifically explains the specific application process of the method, calculates and explains the region where a plurality of distributed GNSS interference radiation sources are located, the calculated result also accords with the change trend of the distributed GNSS interference efficiency, and the typical technical problem to be solved is to provide a distributed GNSS interference efficiency evaluation method, which can accurately give out the spatial distribution characteristics of the distributed GNSS interference signals, and the problem is matched with the method of the invention, has good representativeness, so the data is selected as an embodiment.
In summary, the method for evaluating the interference performance of the distributed GNSS provides the spatial distribution characteristics of the distributed GNSS interference signals, and has very important value in the field of GNSS interference monitoring.
Meanwhile, it should be pointed out that the technical scheme of the invention cannot be independent from technical flow and mathematical model, and the calculation and formulas appearing in each step are indispensable technical means for realizing the scheme of the invention, and the technical characteristics of the invention are already represented in the physical meaning and specific application field represented by mathematical function parameters.
Claims (1)
1. A distributed GNSS interference effectiveness evaluation method is characterized by comprising the following steps:
step 1, setting deployment point positions (x) of each GNSS interference radiation source i ,y i ) And an interference range to be evaluated, determining deployment point positions (x) of each GNSS interference radiation source according to the interference range to be evaluated i ,y i ) I represents an ith GNSS interference radiation source;
step 2, setting characteristic parameters of each GNSS interference radiation source and antenna gain of each GNSS interference radiation source, wherein the characteristic parameters comprise the emission power of the ith GNSS interference radiation sourceInterfered GNSS frequency f and gain of transmitting antenna of ith GNSS interference radiation source +.>
Step 3, respectively calculating attenuation values on the electromagnetic wave propagation channel paths of each GNSS interference radiation source:
in the above-mentioned method, the step of,representing propagation attenuation value d of interference signal of ith GNSS interference radiation source on propagation path i Representing the wave propagation path length of the ith GNSS interference radiation source from the current grid point;
step 4, respectively calculating the interference-signal ratio of each GNSS interference radiation source on each grid point in the interference range to be evaluated:
in the above formula:a signal-to-interference ratio representing an ith GNSS interference radiation source; />Representing the ith GNSS interferes with other relevant loss values of the radiation source; p (P) rec Setting the floor power of the representative GNSS receiver to-125 dBm;
calculating the interference-signal ratio of each GNSS interference radiation source on the current grid point through the formula, and then calculating the interference-signal ratio of all grid points in the interference range to be evaluated in a traversing way;
step 5, giving the anti-interference capability of the GNSS receiver:
representing the anti-interference capability of the GNSS receiver when the number of the interference radiation sources is k;
step 6, combining the anti-interference capability of GNSS receivers under different conditionsAnd +.>Judging the interfered condition of the current calculation grid point:
judging whether the number of the interference radiation sources is not lower than k and the interference signal ratio exists when the number of the interference radiation sources is k by a traversing modeNot lower than->If yes, stopping traversing, and judging that the current calculation grid point is interfered; if the current calculation grid points are not interfered when the traversal is finished, judging that the current calculation grid points are not interfered;
and 7, traversing the interfered conditions on all grid points in the interference range to be evaluated to obtain the interference effectiveness space distribution characteristics of the whole distributed GNSS interference signal.
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