CN108828513A - The signal source localization method intersected based on more monitoring point radio wave propagations decaying isodiff - Google Patents
The signal source localization method intersected based on more monitoring point radio wave propagations decaying isodiff Download PDFInfo
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- CN108828513A CN108828513A CN201810342088.3A CN201810342088A CN108828513A CN 108828513 A CN108828513 A CN 108828513A CN 201810342088 A CN201810342088 A CN 201810342088A CN 108828513 A CN108828513 A CN 108828513A
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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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/04—Position of source determined by a plurality of spaced direction-finders
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Abstract
The invention discloses a kind of signal source localization methods intersected based on more monitoring point radio wave propagations decaying isodiff, include the following steps：Step 1：In the monitoring built-in vertical n >=3 electromagnetic signal monitoring point in region；Step 2：It determines the radio wave propagation decaying isodiff of n monitoring point between any two, obtainsIsodiff；Step 3：It findsThe intersection point of isodiff between any two, these highest net regions of intersection point registration are the position location in unknown signaling source.The present invention is a kind of DF and location method of passive target, and the position in unknown signaling source can be accurately positioned, and can effectively overcome electromagnetic wave diffraction brought by geographical environment and multipath effect to influence, and independent of accurate antenna or antenna array.
Description
Technical field
The invention belongs to spectrum monitoring fields, are related to a kind of letter intersected based on more monitoring point radio wave propagations decaying isodiff
Number source localization method.This method on the basis of the signal strength that electromagnetic monitoring point measures, by monitor region geography information and
Radio wave propagation algorithm constructs the radio wave propagation decaying isodiff between monitoring point, and is intersected with a plurality of isodiff come positioning signal
Source.
Background technique
As the mankind more and more deeply and are widely applied electromagnetic spectrum resource, electromagnetic environment deteriorates increasingly, frequency spectrum money
Source growing tension.To efficiently use electromagnetic spectrum resource, maintenance legitimate correspondence is unimpeded, reduces electromagnetic pollution and malice electromagnetism is dry
It disturbs, it is necessary to grasp reliable outdoor radio Passive Localization Technology and means.
According to DF and location clarification of objective, radio direction finding technology can be divided into passive Bearing positioning with
Active target DF and location.In general, the locating effect of the latter is more preferable when the former technology is suitable for the latter.
Passive Bearing positioning generally comprises 2 steps of direction finding and positioning, is more monitoring point direction findings first, then can realize friendship
Fork positioning.Passive Bearing substantially includes 4 kinds of systems：(1) amplitude-comprised direction-finding：Same letter is measured according to direction-finder antenna or antenna array
Number relative radiated power size determine sense；(2) than phase direction finding：Same signal is measured according to direction-finder antenna or antenna array
Relative phase difference determine sense；(3) Space ball：Using the spatial correlation characteristic of antenna array output signal as base
The super-resolution Power estimation method of plinth；(4) interferometer direction finding：Interferometer is divided into two class of phase-interferometer and correlation interferometer, phase
The sample database that interferometer does not pre-establish, wave are solved up to phase difference；Correlation interferometer must in advance press azimuth and pitch angle
Certain resolution establishes sample database, and the phase difference vector of incoming wave is compared one by one with sample database.Modern passive Bearing is fixed
Position is typically necessary accurate antenna or antenna array.
Active target DF and location generally requires active target and issues a mark that can be effectively recognized, substantially wraps
Containing 4 kinds of systems：(1) timi requirement (TOA) is reached based on wave：Data are carried out to certain time of arrival (toa) with multiple monitoring points to adopt
Collection, estimation monitoring point use equidistant circular arc cross bearing with after target range；(2) wave reaches digital (TDOA)：Pass through ratio
The more same signal reaches the time difference of time spent by different monitoring points to obtain target to the range difference of different monitoring points, hands over
Fork may be implemented to position by the hyperbola of focus of different monitoring points；(3) signal strength positioning (SOA)：Also known as signal strength
Telemetry (RSSI), the target emanation signal strength of this method are known quantity, by measurement received signal strength, use electromagnetic wave
The statistical model of space attenuation, estimates the distance of target and monitoring point, and then realizes cross bearing again.
However, existing localization method is all not easy to effectively remove the influence of electromagnetic wave diffraction and multipath effect.
Summary of the invention
Deficiency existing for above-mentioned prior art is solved in order at least part of, the present invention proposes a kind of based on more monitoring point electricity
The signal source localization method that wave propagation attenuation isodiff is intersected, is a kind of DF and location method of passive target, can be accurately positioned
The position in unknown signaling source.Localization method proposed by the invention can effectively overcome electromagnetic wave diffraction brought by geographical environment
It is influenced with multipath effect, and independent of accurate antenna or antenna array.
According to an aspect of the present invention, a kind of signal source intersected based on more monitoring point radio wave propagations decaying isodiff is provided
Localization method includes the following steps：
Step 1：In the monitoring built-in vertical n >=3 electromagnetic signal monitoring point in region, wherein the position of any 3 monitoring points is not
Collinearly, k-th of monitoring point is expressed as Rk(k=1,2 ..., n) and this monitoring point RkThe radiant power for the signal source that place measures is
Pk；
Step 2：It determines the radio wave propagation decaying isodiff of n monitoring point between any two, obtainsIsodiff；
Step 3：It findsThe intersection point of isodiff between any two, these highest net regions of intersection point registration are
The position location in unknown signaling source.
Further, the step 1 further includes：According to the resolution ratio m of generalized information system, monitoring region is divided into grid.
In some embodiments, in the step 2, the radio wave propagation decaying isodiff packet between two monitoring points is determined
Include following steps：
S01：According to monitoring point RkAnd RjThe radiant power P of the signal source measuredkAnd Pj, calculate monitoring point RkAnd RjRadiation
Power difference Pk-Pj=xdB, wherein k, j≤n, and k ≠ j, x are real number；
S02：Establishing frequency in each grid point is f0, radiant power P0Radiation source, calculate the radiation of each grid point
Source is to monitoring point RkAnd RjRadio wave attenuation lkAnd lj, by difference DELTA L=lk-ljEqual grid connects into line, obtains monitoring point
RkAnd RjBetween radio wave propagation decay isodiff cluster；
S03:The difference that radio wave propagation decaying is picked out in the isodiff cluster that step S02 is obtained is the isodiff of xdB, is determined
For monitoring point RkAnd RjBetween radio wave propagation decay isodiff Δ Lk,j。
Further, it in step S02, is calculated using the Detvag-90/FOI radio waves propagation model comprising topography and geomorphology each
The radiation source of grid point is to monitoring point RkAnd RjRadio wave attenuation lkAnd lj。
In some embodiments, in the step 2, the radio wave propagation decaying isodiff packet between two monitoring points is determined
Include following steps：
S01':In monitoring point RkUpper erection radiant power is PjVirtual radiation source, using radio wave propagation algorithm, in GIS system
The radiated electric field contour of virtual radiation source generation is drawn out on system；
S02'：Equally, in monitoring point RjUpper erection radiant power is PkVirtual radiation source, draw radiated electric field contour；
S03'：For the radiated electric field contour of two virtual radiation sources there are multiple intersection points, it is to supervise that these intersection points, which are linked to be line,
Measuring point RkAnd RjBetween radio wave propagation decaying difference be xdB isodiff, which is determined as monitoring point RkAnd RjBetween electricity
Wave propagation attenuation isodiff Δ Lk,j,
Wherein, k, j≤n, and k ≠ j, x are real number.
Further, signal source is omnidirectional radiation, is highly h, receiving antenna is omnidirectional antenna.
The beneficial effects of the present invention are：
Radio wave propagation algorithm has fully considered the diffraction and multipath effect of signal.Intersected based on radio wave propagation decaying isodiff
Signal source localization method electromagnetic wave diffraction brought by geographical environment and multipath effect can be overcome to influence, realize intricately
Manage the positioning of signal source in environment.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical solution in the application embodiment
Attached drawing to be used is briefly described.
Fig. 1 is monitoring point R in monitoring region1、R2、R3Position view.
Fig. 2 is the monitoring point R of an embodiment1With monitoring point R2Radio wave propagation decaying isodiff cluster trajectory diagram.
Fig. 3 is the monitoring point R of another embodiment1With monitoring point R2Radio wave propagation pad value isodiff Δ L1,2Track
Figure.
Fig. 4 is according to three isodiff Δ L1,2、ΔL2,3、ΔL1,3Intersection point estimation radiation source source position schematic diagram.
Specific embodiment
Below in conjunction with the attached drawing in the application embodiment, the technical solution in presently filed embodiment is carried out clear
Chu, complete description.
For convenient for calculating, the radiant power unit of signal is unified for dBm.Without loss of generality can simplified model, setting signal
The frequency in source is f0, signal source is omnidirectional radiation, is highly fixed on h；Receiving antenna is also omnidirectional antenna.Monitor GIS in region
Resolution ratio in system is m.
Step 1:As shown in Figure 1, selected monitoring region, establishes n=3 electromagnetic signal monitoring point R1、R2、R3, 3 monitorings
Point R1、R2、R3Position it is not conllinear.In this example, the frequency f in setting signal source0=900MHz.Monitoring point R1、R2、R3In
The signal radiation power that each monitoring point measures signal source is respectively P1=-77.1dBm, P2=-74.5dBm, P3=-
76.1dBm。
Step 2：Determine monitoring point R1、R2Between radio wave propagation decay isodiff Δ L1,2.In radio wave propagation decaying equal difference
Line Δ L1,2On, signal source to monitoring point R1、R2Radio wave propagation decaying difference Δ L be constantly equal to P2-P1=-74.5dBm- (-
77.1dBm)=2.6dBm.When Δ L value difference, there is different isodiffs, number is surveyed in the data valid bit number of Δ L and monitoring point
According to being consistent.Similarly determine monitoring point R2、R3Between radio wave propagation decay isodiff Δ L2,3, monitoring point R1、R3Between
Radio wave propagation decaying isodiff Δ L1,3.Monitoring point of the invention between any two radio wave propagation decaying isodiff can by with
Lower two kinds of directions determine.To simplify explanation, below only with isodiff Δ L1,2For illustrate the determination method of isodiff.
Method 1：According to the resolution ratio m of generalized information system, monitoring region is divided into grid.Establishing frequency in each grid point is
f0The radiation source of=900MHz, setting radiant power can random value, value is from P here0=-20dBm starts, using comprising
The Detvag-90/FOI radio waves propagation model of topography and geomorphology calculates the radiation source of each grid point to monitoring point R1And R2Electric wave
Decay l1And l2, by difference DELTA L=l1-l2Equal grid connects into line, and monitoring point R can be obtained1And R2Between radio wave propagation decline
Subtract isodiff cluster.The isodiff that difference by the decaying of wherein radio wave propagation is 2.6dB is picked out, and monitoring point R is determined as1、R2Between
The high h in source radio wave propagation decay isodiff Δ L1,2。
As shown in Fig. 2, setting up a virtual radiation source respectively on each grid point, radiant power is -20dBm；Using
Detvag-90/FOI radio waves propagation model comprising topography and geomorphology calculates each grid point to monitoring point R1、R2Path attenuation
l1、l2.By path attenuation l1、l2The equal grid point line of difference, establish path attenuation isodiff cluster.To simplify figure, in figure
The isodiff cluster that the differences such as wherein path attenuation are -10dB, -5dB, 3dB, 6dB, 10dB is only marked.
It should be appreciated that grid point point is thinner, isodiff cluster is more and precision is higher.
Method 2：In monitoring point R1One virtual radiation source of upper erection, the radiant power of the virtual radiation source are monitoring point R2
Reception power -74.5dBm；It is emulated using the Detvag-90/FOI radio waves propagation model comprising topography and geomorphology, in GIS
The radiated electric field contour of virtual radiation source generation is drawn out in system.Equally, in monitoring point R2Upper erection radiant power is
Monitoring point R1Reception power -77.1dBm virtual radiation source, draw electric field contour.
As shown in figure 3, in monitoring point R1、R2Upper to set up a virtual radiation source respectively, radiant power is the reception function of other side
Rate -74.5dBm and -77.1dBm；It is emulated using the Detvag-90/FOI radio waves propagation model comprising topography and geomorphology.Two
There are intersection points for the equivalent contour of virtual radiation source, these intersection points are linked to be line, as monitoring point R1And R2Between radio wave propagation decay
Difference be 2.6dB isodiff.The radiated electric field contour P of virtual source generation is drawn out in monitoring regiont2、Pt1.It will
Pt2、Pt1Be worth identical location point to be marked, for simplify figure mark wherein -90dBm, -100dBm, -110dBm, -
The crosspoint of 120dBm.Contour crosspoint line is obtained into monitoring point R1、R2Between the high h in source radio wave propagation decay equal difference
Line Δ L1,2。
Equally, monitoring point R is determined respectively2、R3Between radio wave propagation decay isodiff Δ L2,3, monitoring point R1、R3Between
Radio wave propagation decay isodiff Δ L1,3。
Step 3：Find 3 isodiff Δ L obtained in step 21,2、ΔL2,3、ΔL1,3Intersection point between any two, this
A little highest net regions of intersection point registration are the position location in unknown signaling source.As shown in figure 4, determining monitoring point R1、R2It
Between radio wave propagation decay isodiff Δ L1,2, monitoring point R2、R3Between radio wave propagation decay isodiff Δ L2,3, monitoring point R1、
Radio wave propagation decaying isodiff Δ L between R31,3.The intersection position of three radio wave propagation pad value isodiffs is unknown signaling
The estimated location in source.In principle, the radio wave propagation decaying isodiff of monitoring point between any two all can be by where unknown signaling source
Position
It should be understood that theoretically the intersection point of isodiff between any two coincides with a bit, but due to the precision of mapping
Each intersection point can be made to cannot achieve to coincide with a bit.
Claims (8)
1. a kind of signal source localization method intersected based on more monitoring point radio wave propagations decaying isodiff, which is characterized in that including
Following steps：
Step 1：In the monitoring built-in vertical n >=3 electromagnetic signal monitoring point in region, wherein the position of any 3 monitoring points is not total
Line, k-th of monitoring point are expressed as Rk(k=1,2 ..., n) and this monitoring point RkThe radiant power for the signal source that place measures is Pk；
Step 2：It determines the radio wave propagation decaying isodiff of n monitoring point between any two, obtainsIsodiff；
Step 3：It findsThe intersection point of isodiff between any two, these highest net regions of intersection point registration are as unknown
The position location of signal source.
2. the signal source localization method according to claim 1 intersected based on more monitoring point radio wave propagations decaying isodiff,
It is characterized in that, the step 1 further includes：According to the resolution ratio m of generalized information system, monitoring region is divided into grid.
3. the signal source localization method according to claim 2 intersected based on more monitoring point radio wave propagations decaying isodiff,
It is characterized in that, determining that the radio wave propagation decaying isodiff between two monitoring points includes the following steps in the step 2：
S01：According to monitoring point RkAnd RjThe radiant power P of the signal source measuredkAnd Pj, calculate monitoring point RkAnd RjRadiant power
Difference Pk-Pj=xdB, wherein k, j≤n, and k ≠ j, x are real number；
S02：Establishing frequency in each grid point is f0, radiant power P0Radiation source, the radiation source for calculating each grid point arrives
Monitoring point RkAnd RjRadio wave attenuation lkAnd lj, by difference DELTA L=lk-ljEqual grid connects into line, obtains monitoring point RkAnd Rj
Between radio wave propagation decay isodiff cluster；
S03:The difference that radio wave propagation decaying is picked out in the isodiff cluster that step S02 is obtained is the isodiff of xdB, is determined as supervising
Measuring point RkAnd RjBetween radio wave propagation decay isodiff Δ Lk,j。
4. the signal source localization method according to claim 3 intersected based on more monitoring point radio wave propagations decaying isodiff,
It is characterized in that, calculating each grid using the Detvag-90/FOI radio waves propagation model comprising topography and geomorphology in step S02
The radiation source of point is to monitoring point RkAnd RjRadio wave attenuation lkAnd lj。
5. the signal source localization method according to claim 2 intersected based on more monitoring point radio wave propagations decaying isodiff,
It is characterized in that, determining that the radio wave propagation decaying isodiff between two monitoring points includes the following steps in the step 2：
S01':In monitoring point RkUpper erection radiant power is PjVirtual radiation source, using radio wave propagation algorithm, in generalized information system
Draw out the radiated electric field contour of virtual radiation source generation；
S02'：Equally, in monitoring point RjUpper erection radiant power is PkVirtual radiation source, draw radiated electric field contour；
S03'：For the radiated electric field contour of two virtual radiation sources there are multiple intersection points, it is monitoring point R that these intersection points, which are linked to be line,k
And RjBetween radio wave propagation decaying difference be xdB isodiff, which is determined as monitoring point RkAnd RjBetween radio wave propagation
Decay isodiff Δ Lk,j,
Wherein, k, j≤n, and k ≠ j, x are real number.
6. the signal source positioning intersected described in one of -5 based on more monitoring point radio wave propagations decaying isodiff according to claim 1
Method, which is characterized in that signal source is omnidirectional radiation, is highly h, receiving antenna is omnidirectional antenna.
7. the signal source positioning intersected described in one of -6 based on more monitoring point radio wave propagations decaying isodiff according to claim 1
Method, which is characterized in that the signal source localization method is positioned suitable for passive Bearing.
8. the signal source positioning intersected described in one of -6 based on more monitoring point radio wave propagations decaying isodiff according to claim 1
Method, which is characterized in that the signal source localization method is suitable for active target DF and location.
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