CN109188355A - A kind of optimization of multipoint location system receiving antenna and Optimal Station method - Google Patents
A kind of optimization of multipoint location system receiving antenna and Optimal Station method Download PDFInfo
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- CN109188355A CN109188355A CN201811075579.2A CN201811075579A CN109188355A CN 109188355 A CN109188355 A CN 109188355A CN 201811075579 A CN201811075579 A CN 201811075579A CN 109188355 A CN109188355 A CN 109188355A
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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
- G01S5/08—Position of single direction-finder fixed by determining direction of a plurality of spaced sources of known location
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
Optimize reception station location, quantity, the method for receiving antenna directional properties the present invention relates to multipoint positioning technical field in civil aviation field more particularly to a kind of prediction of multipoint location system multi-path jamming and appraisal procedure and for difference airport environment locating for receiving station.The present invention is optimized from multipoint location system receiving antenna, multi-path jamming is inhibited using different directional aerials, it is established and the close traffic pattern 3D physical model of true environment by the detailed data obtained, the case where using propagation of the electromagnetic signal in airport environment is emulated based on ray casting, geometrically consistent diffraction theory, finally combines genetic algorithm and airport environment, MLAT system layout, receiving antenna directional properties to obtain multiobjective optimization solution.The present invention improves the electromagnetic parameter result reliability of emulation, provides more accurate MLAT system covering analyzing, can predict electromagnetic propagation, and optimization website layout improves the signal-to-noise ratio for receiving signal, enhances the fixation and recognition ability of multipoint location system.
Description
Technical field
The present invention relates to multipoint positioning technical field in civil aviation field more particularly to a kind of multipoint location system multipaths
Interference prediction and appraisal procedure and optimize for difference airport environment locating for receiving station receive station location, quantity, receiving antenna
The method of directional properties.
Background technique
Multipoint positioning technology based on step-out time (Time Difference of Arrival, abbreviation TDOA) is a kind of
Different from the novel positioning monitoring technology of conventional radar, visual and clear with positioning principle compared with conventional radar, website layout
Flexible easily-controllable, positioning accuracy the particular advantages such as is evenly distributed with website layout, recommends that it as " advanced by International Civil Aviation Organization
Scene activity guidance and control system " airport scene monitoring technology.
Multipoint positioning technology can be divided into scene multipoint positioning (runway/slide channel monitoring, level ground monitoring of standing) and wide area multiple spot
Positioning (air route/monitored into nearly monitoring, height, parallel runways monitoring) two major classes.Numerous in relative narrowness, building, aircraft is close
Collect, the traffic pattern of geographical environment and electromagnetic environment complexity, the echo signal under multi-path jamming seriously affects effectively connecing for signal
It receives.Because airport security and other factors limit, position multidigit receives multipoint location system receiving antenna in airport shelter bridge top
Position and terminal distance are close, and multipath signal power is strong, and the time difference for reaching receiving antenna with direct signal is small, and multipath signal is connecing
The superposition on antenna is received, signal pulse shape distortion and intersymbol interference are caused, positioning accuracy is caused to generate large error or even nothing
Method is recognized by the system.When multi-path jamming is serious, echo signal arrival time (Time of Arrival, abbreviation TOA) measurement error
It is excessive, cause multipoint positioning TDOA positioning equation group without solution, cannot achieve and target effective is positioned, Losing Data occur.Airport
Multi-path jamming in complex electromagnetic environment is the key factor for directly affecting multipoint positioning performance, is that multipoint location system is urgent
The practical problem for needing to solve.
Open (bulletin) number CN103901397A discloses a kind of choice of scene multipoint positioning position solution under complex environment
Method, be mainly responsible for TDOA under multipoint location system complexity actual field face ring border to target position location settle accounts and sprocket bit
The self-test output function set.Cardinal principle is by whether judging two step location estimation residual sample of chanShi multipoint positioning algorithm
Meet the probability distribution under normal noise level to carry out positioning result subsequent processing and accept or reject to operate.The patent only passes through
Determine whether to meet normal noise level to the sample residual estimation of position to accept or reject website, and not from the original of transmission
Noise is reduced in beginning root.Open (bulletin) number CN104833953A discloses a kind of based on TDOA and the double tracking module systems of track
The multipoint positioning monitoring system and method united under the airport non line of sight channel circumstance of framework, the patent are handled by TDOA tracking
TDOA information after generating correction handles the location information after generating correction by Track In Track.But the patent is only applicable to
Multipoint positioning monitoring system under non line of sight channel circumstance can not be believed by Track In Track auxiliary corrective TDOA information from electromagnetism
Non line of sight interference and multi-path jamming in multipoint location system number are solved the problems, such as in the original root of transmission.Open (bulletin)
Number CN104965401A discloses a kind of measurements of arrival time method and system of multipoint positioning dependent surveillance system, fixed in multiple spot
Under the system reference clock that position dependent surveillance system provides, A/D sample quantization is carried out for the target response signal received；It is right
Digital signal after A/D sample quantization carries out difference matched filtering；To the signal after difference matched filtering into zero-crossing examination；?
The time is reached using zero-crossing examination technology acquisition target response signal in detection threshold.Effectively improving multipoint positioning correlation
Under the premise of the positioning accuracy and reduction hardware cost of monitoring system require, reaches and improve estimating precision, reducing system for arrival time
The purpose of unified test amount time error.But the patent is only with the mode of the software filtering of difference matched filtering, to channel
Middle AF panel effect is limited.Therefore above-mentioned all patents without solving complicated electromagnetism in civil aviaton's multipoint location system from the root
Under environment the problem of multi-path jamming.
Open (bulletin) number CN101706569A discloses the covering precision appraisal procedure and dress of a kind of multipoint location system
It sets, realizes effective assessment under non line of sight serious situation to the covering precision of multipoint location system, so that user can be with
Influence of the placement geometry distribution of each distal end receiving station to the precision of multipoint location system is got, it can be to multipoint positioning system
It is instructed at the receiver geometry cloth station of system.But in complex electromagnetic environment, electromagnetic signal is built different structure is various sizes of
Situations such as generating reflection, refraction, diffraction on object is built, is only that can not carry out multipoint positioning system under multi-path jamming by coordinate data
Effective assessment of system covering precision, and the undocked receipts station antenna optimization aspect of the patent carries out multipoint positioning receiver cloth station and examines
Consider.
Summary of the invention
In order to solve the problems, such as under multi-path jamming serious conditions to the prediction of multipoint location system receptivity and assessment and needle
Optimize the problem of receiving station location, quantity, receiving antenna directional properties to difference airport environment locating for receiving station.Benefit of the invention
Inhibit " space filtering " function than realization with the directional properties of directional aerial and front and back, inhibits multipath in receiver front end
Interference solves the problems, such as in civil aviaton's multipoint location system multi-path jamming under complex electromagnetic environment；Based on ray casting and
Geometrically consistent diffraction theory realizes civil aviaton's multipoint location system in the three-dimensional modeling on airport, solve multipoint location system by
The problem of being predicted and assessed in the case of multi-path jamming；In conjunction with genetic algorithm and airport environment, multipoint positioning
(Multilateration, abbreviation MLAT) system layout, receiving antenna directional properties, solve in civil aviaton's multipoint location system
The problem of receiving station location, quantity, the optimal solution of receiving antenna directional properties.
The technical solution adopted by the present invention to solve the technical problems is:
First against electromagnetic signal, complex electromagnetic environment in civil aviaton's multipoint location system is solved in the root of transmission
The problem of lower multi-path jamming.The present invention is optimized from multipoint location system receiving antenna, for multipath signal and direct signal
The different situation of arrival direction can use different directional aerials to multipoint positioning receiving station.Directional aerial is because it is in space
On directed radiation performance, its main beam can be made to be directed toward desired sense, and secondary lobe and episternites are directed toward interference radiating way,
Inhibit the reception power than improving desired signal by the main lobe width of directional aerial and front and back, and multipath signal is inhibited to connect
Power is received, " airspace filter " is played the role of, to improve the signal-to-noise ratio for receiving signal, the positioning for enhancing multipoint location system is known
Other ability.The use of directional aerial also mitigates the burden of back end signal processing simultaneously, inhibits multipath from the source for receiving signal
Interference.
Aiming at the problem that multi-path jamming prediction in civil aviaton's multipoint location system and assessment, the present invention is by obtaining traffic pattern
Landform digital elevation model, Aerodrome Construction structure size and material and other airport environment data, by the detailed number obtained
It is managed according to foundation and the close traffic pattern 3D physical model of true environment, and using based on ray casting, geometrically consistent diffraction
The case where by propagation of the electromagnetic signal in airport environment is emulated, this method is for complicated city, suburb, interior and mixing
The electromagnetic wave propagation and the characteristic of channel of indoor and outdoor surroundings or particular model can provide the prediction of efficiently and accurately.Ray tracing
Method is a kind of general propagation modeling tool, can be used for solving the Maxwell equation of high-frequency region, calculates path loss, reaches
Angle and time delay.The versatility poor compared to Conventional wisdom models and theory model, ray casting is by computer journey
Sequence finds out more accurate numerical solution, requires seldom, to calculate to calculator memory using the high-frequency approximation method of ray casting
Speed is fast, solve Fdtd Method, finite element, moment method be representative etc. electromagnetic computing softwares it is remote to radio propagation environment
Much larger than electromagnetic wavelength (electrically large sizes) computational problem when low memory hsrdware requirements and simulation time is too long can not
The problems such as obtaining analytic solutions.Previous geometrical optics field is unable to the field in computational shadowgraph region, and the field of computational shadowgraph near border is also
Inaccuracy, geometrically consistent diffraction theory is because it provides accurate calculation method to electromagnetic wave diffraction problem, so repairing
The shortcomings that just geometric optics is unable to computational shadowgraph regional field.Electric and magnetic fields are carried out by reflection coefficient and scattering properties
Approximate calculation carries out the ginsengs such as reception power, path loss, arrival time delay using the performance parameter of electric field He practical receiver antenna
Several calculating provides a good solution for the Electromagnetic Simulation problem of super electrically large sizes.
Aiming at the problem that receiving station location, quantity, the optimal solution of receiving antenna directional properties in civil aviaton's multipoint location system,
Present invention combination genetic algorithm and airport environment, MLAT system layout, receiving antenna directional properties obtain multiobjective optimization solution.It loses
Propagation algorithm is a kind of computation model based on Swarm Evolution, it by the individual of group ask the methods of breeding, variation, competition into
The capable information exchange survival of the fittest, thus the optimal solution of approximation problem a step by a step.Choosing is mainly passed through to the genetic manipulation of individual
It selects (breeding), intersect and these three basic heredity that make a variation are let it pass to realize.According to MLAT positioning system positioning requirements and machine
Restricted area of receiving station installation etc. proposes constraint condition, establishes auto-adaptive function, several times by genetic algorithm iteration
Until iteration result meets auto-adaptive function and constraint condition, the optimal layout position of all receiving stations in traffic pattern can be found out
It sets and the directional properties of receiving antenna and cloth station quantity.
The beneficial effects of the present invention are:
The 3D physical model for realizing traffic pattern electromagnetic environment is established, and the foundation of model relies on accurate digital terrain mould
The structure sizes such as type and accurate Aerodrome Construction such as airline, runway, shelter bridge, control tower data and material, true electromagnetism
The close model of environment greatly improves the electromagnetic parameter result reliability of emulation.
Electrically large sizes Electromagnetic Simulation is carried out using ray casting, electromagnetic computing software is solved and electrically large sizes is calculated
The too long problem of the hardware problem and simulation time of low memory when problem, while geometrically consistent diffraction theory method is to electromagnetism
Wave diffraction problem provides accurate calculation method.Covered area of optical radiation institute in previous MLAT system covering analyzing
Domain is to receive effective coverage, and have ignored shadow region electromagnetic wave diffraction problem, compared to using with the presence or absence of optical sighting distance
The method to analyze the covering of MLAT system is propagated, this patent is capable of providing more accurate MLAT system covering analyzing, and pre-
Electromagnetic propagation is surveyed, the functions such as receiving antenna directional properties are rationally arranged in optimization website layout.
This method uses directional aerial in MLAT system receiving station, inhibits multi-path jamming in receiver front end, improves
The signal-to-noise ratio for receiving signal, enhances the fixation and recognition ability of multipoint location system.
Detailed description of the invention
Fig. 1 is the S mode signal under multi-path jamming；
Fig. 2 is the S mode signal after directional aerial inhibits；
Fig. 3 is the flow chart of the method for the invention.
Specific embodiment
In order to be illustrated more clearly that technical solution of the present invention, the present invention is done further in detail with reference to the accompanying drawing
Description.
Multi-path jamming can be inhibited from source using different directional aerials to multipoint positioning receiving station.If such as in S mould
Multipath signal in formula signal in aliasing Fig. 1, the multipath signal are direct signal amplitude 3dB, and delay is about 700ns, if connecing
It receives antenna main lobe direction and receives direct signal, multipath signal is received from antenna episternites direction, and the front and back inhibition ratio of directional aerial is
20dB, then for received signal as shown in Fig. 2, multi-path jamming obtains effective inhibition, signal, can be more without intersymbol interference
Threshold test accurately is carried out to preamble pulse, improves the precision and recognition capability of multipoint positioning TOA estimation.
The present invention will realize three purposes: multi-path jamming is asked under complex electromagnetic environment in solution civil aviaton's multipoint location system
Topic；Solve the problems, such as multi-path jamming prediction and assessment in civil aviaton's multipoint location system；It solves to receive in civil aviaton's multipoint location system
The problem of station location, quantity, optimal solution of receiving antenna directional properties.Wherein, multipoint location system multi-path jamming is solved the problems, such as,
It needs to predict using multi-path jamming to judge whether multi-path jamming eliminates MLAT systematic influence with assessment, assessment result is multipath
Interference suppressioning effect provides data supporting.And third object of the present invention: it solves to receive erect-position in civil aviaton's multipoint location system
It sets, quantity, the Optimal solution problem of receiving antenna directional properties, is in the rear realization for realizing the first two purpose.
As shown in figure 3, the specific implementation process is as follows:
The first step establishes traffic pattern electromagnetic environment model.Obtain the ground that will carry out the airport that MLAT receives station arrangement
Shape digital elevation model, Aerodrome Construction (terminal building, shelter bridge, runway etc.) structure, material and dimension data are established and true electricity
The close 3D physical model of magnetic environment.
Second step is arranged effective transmitting position and receives position.Transmitting position is evenly distributed on the MLAT to be assessed
In the recognition capability region of system, transmitting position can be according to needing to be arranged.Position is received often by factors such as Airport Operation safety
Limitation needs to combine practical and assessment receiving area, and setting receives position.
Third step changes the directional properties of receiving antenna.Existing MLAT system receiving station because consider coverage area, so
It is all made of horizontal omnidirectional receiving antenna, and having proved in technical solution can obtain more preferably in receiving station's replacement directional aerial
Reception, wherein factor in need of consideration is the main lobe angle of directional antenna radiation, the horizontal direction main lobe of aerial radiation
Angle can be set to 0 to 360 °, and the inhibitory effect and receiving antenna that the main lobe angle of antenna will affect multipath signal are to transmitting
The coverage area in region is needed in the directional receiving antenna MLAT receptivity for assessing different main lobe widths in next step.
4th step, airport electromagnetic signal Electromagnetic Simulation.Each launch point in emitting area successively emit equal-wattage and
The identical signal of mode, such as S mode, electromagnetic signal are propagated in the 3D model of airport, by ray casting and it is geometrically consistent around
The processes such as the reflection, refraction, diffraction of theoretical judgment signal are penetrated, and obtain reception power, the road of transmitting signal in receiving antenna
Diameter loss reaches delay parameter.
5th step judges multipath signal to MLAT system interference degree.It, can according to transmitting position at a distance from reception position
The time required to calculating the direct signal between transceiver location, direct signal is judged, then calculate multipath signal through
The amplitude difference and phase difference of signal and each multipath signal, if multipath signal amplitude is greater than 50% or more direct signal amplitude
Or multipath signal and direct signal time delay are greater than 0.5us (the single element duration of S mode signal is 0.5 ± 0.05us), then
Think to be influenced by multipath signal more serious, returns to third step, change directional aerial main lobe width, emulate again, if multipath is believed
It number is met the requirements with direct signal amplitude, delay variation, then it is believed that the receiving antenna performance meets MLAT system identification condition,
" space filtering " is achieved the purpose that, in all directional receiving antennas met the requirements, selection keeps main lobe width maximum, with to the greatest extent
Wider array of coverage rate can be able to satisfy.
6th step proposes constraint condition, finds out the target of MLAT system receiving station addressing restrictive condition and optimization.MLAT system
The reception station location addressing of system is often limited by the various aspects such as Airport Operation safety and receiving station's installation safety, therefore, is needed
The region of receiving antenna setting is limited in a model.How to choose the position of website in the region of limitation is in need of consideration ask
One of topic；How different receiving stations be arranged different receiving antennas directional properties (such as omnidirectional antenna, 180 ° of directional aerials,
120 ° of directional aerials, 90 ° of directional aerials etc.) it is one of problem；Meanwhile receiving station's quantity as few as possible is also one of target,
The covering precision and recognition capability of MLAT system can be improved in more website numbers, but consequent is the cost of great number,
Therefore, the website layout side for meeting minimum number under the positioning requirements such as covering power and precision, recognition capability of MLAT system is found out
Case is also one of target.
7th step establishes auto-adaptive function according to the algorithm that will be used.Auto-adaptive function changes for distinguished number
After generation as a result, simultaneously, provide the index of quantization to the influence degree of direct signal for multipath signal in MLAT system to judge,
Therefore, it is necessary to combine algorithm to be used establishing auto-adaptive function.It is established formula (1) here in connection with genetic algorithm, the letter of formula (1)
Numerical value it is smaller characterization its influenced by multipath signal it is smaller, according to practical MLAT system accuracy and recognition capability requirement be configured.
N multipath signal number, P in formulaiFor the reception power of i-th multipath signal, tiFor the TOA of i-th multipath signal,
PdFor the reception power of direct signal, tiFor the TOA of direct signal, Δ tmaxFor direct signal with multipath signal is maximum allowable arrives
Up to the time difference.
8th step, airport electromagnetic environment model Computer Simulation.Go out the number of receiving station by algorithm such as genetic algorithm iteration
Directional properties of amount, position and receiving antenna, then parameter is substituted into electromagnetic environment model, using based on ray casting,
Geometrically consistent diffraction theory emulates the case where propagation of the electromagnetic signal in airport environment, obtains its direct signal and multipath signal
Reception power and the parameters such as arrival time, the parameter that will acquire substitute into auto-adaptive function and calculate, wanted if more than auto-adaptive function
Evaluation then continues iteration of simulations, if functional value is less than required value, iteration terminates, the addressing of current receiving station, quantity, orientation
Performance is then target layout scheme.
The above is the preferred embodiment of the present invention, is not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.Under the premise of technical principle of the invention, if can also make
Dry replacement improves, and should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of prediction of multipoint location system multi-path jamming and appraisal procedure and excellent for difference airport environment locating for receiving station
Change receive station location, the method for quantity receiving antenna directional properties, feature the following steps are included:
The first step is established and the close 3D physical model of true electromagnetic environment；
Second step is arranged effective transmitting position and receives position；
Third step changes the directional properties of receiving antenna；
4th step, airport electromagnetic signal Electromagnetic Simulation；
5th step judges multipath signal to MLAT system interference degree；
6th step finds out the target of MLAT system receiving station addressing restrictive condition and optimization；
7th step establishes auto-adaptive function according to the algorithm that will be used；
8th step, airport electromagnetic environment model Computer Simulation, selection target placement scheme.
2. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receive station location, the method for quantity receiving antenna directional properties, which is characterized in that in the first step, needs
Obtain landform digital elevation model, Aerodrome Construction structure, material and the size that will carry out the airport that MLAT receives station arrangement
Data.
3. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receives station location, the method for quantity receiving antenna directional properties, which is characterized in that in second step, hair
It penetrates position to be evenly distributed in the recognition capability region of the MLAT system to be assessed, transmitting position can connect according to needing to be arranged
It receives position to need to combine practical and assessment receiving area, setting receives position.
4. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receive station location, the method for quantity receiving antenna directional properties, which is characterized in that in third step, needs
The factor to be considered is the main lobe angle of directional antenna radiation, and the angle of the horizontal direction main lobe of aerial radiation can be set to 0
To 360 °, the inhibitory effect and receiving antenna that the main lobe angle of antenna will affect multipath signal to the coverage area of emitting area,
Need to assess the directional receiving antenna MLAT receptivity of different main lobe widths in the 4th step.
5. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receives station location, the method for quantity receiving antenna directional properties, which is characterized in that in the 4th step, hair
The each launch point penetrated in region successively emits equal-wattage and the identical signal of mode, and electromagnetic signal passes in the 3D model of airport
It broadcasts, the reflection, refraction, diffraction process of signal is judged by ray casting and geometrically consistent diffraction theory, and receiving day
Line obtains the reception power of transmitting signal, path loss, reaches delay parameter.
6. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receive station location, the method for quantity receiving antenna directional properties, which is characterized in that, can in the 5th step
At a distance from reception position, the time required to calculating the direct signal between transceiver location, to be judged straight according to transmitting position
Up to signal, multipath signal is then calculated in the amplitude difference and phase difference of direct signal and each multipath signal, if multipath is believed
Number amplitude is greater than 50% or more direct signal amplitude or multipath signal and direct signal time delay is greater than 0.5us, then it is assumed that by multipath
Effect of signals is more serious, returns to third step, changes directional aerial main lobe width, emulates again, if multipath signal and through letter
Number amplitude, delay variation are met the requirements, then it is believed that the receiving antenna performance meets MLAT system identification condition, have reached " empty
Between filter " purpose, in all directional receiving antennas met the requirements, selection keeps main lobe width maximum, to meet as far as possible
Wider array of coverage rate.
7. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receives station location, the method for quantity receiving antenna directional properties, which is characterized in that in the 6th step,
The reception station location addressing of MLAT system is often limited by the various aspects such as Airport Operation safety and receiving station's installation safety, is needed
The region of receiving antenna setting is limited in a model.
8. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receives station location, the method for quantity receiving antenna directional properties, which is characterized in that in the 7th step, from
Fitness function be iterated for distinguished number after as a result, simultaneously, in MLAT system multipath signal to direct signal
Influence degree provides the index of quantization to judge.
9. multipoint location system multi-path jamming according to claim 1 prediction and appraisal procedure and for locating for receiving station not
Optimize with airport environment and receive station location, the method for quantity receiving antenna directional properties, which is characterized in that in the 8th step, leads to
It crosses algorithm iteration and goes out the directional properties of the quantity of receiving station, position and receiving antenna, then parameter is substituted into electromagnetic environment model
In, the case where using based on ray casting, emulation propagation of the electromagnetic signal in airport environment of geometrically consistent diffraction theory, obtain
Reception power and the arrival time for taking its direct signal and multipath signal, the parameter that will acquire substitute into auto-adaptive function and calculate, if
Greater than auto-adaptive function required value, then continue iteration of simulations, if functional value is less than required value, iteration terminates, current receiving station
Addressing, quantity, directional properties be then target layout scheme.
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| CN110456334A (en) * | 2019-07-27 | 2019-11-15 | 南京理工大学 | TDM-MIMO radar system and its signal processing method based on optimization Sparse Array |
| CN110764050A (en) * | 2019-11-07 | 2020-02-07 | 南京莱斯电子设备有限公司 | Simulation test method for multipoint positioning system |
| CN111510932A (en) * | 2020-03-21 | 2020-08-07 | 杭州迪普科技股份有限公司 | Wireless access point deployment method and device, electronic equipment and computer readable medium |
| CN111629383A (en) * | 2020-05-09 | 2020-09-04 | 清华大学 | Channel prediction method and device for pre-deployment of mobile air base station |
| CN114374982A (en) * | 2022-01-05 | 2022-04-19 | 上海船舶运输科学研究所有限公司 | Antenna arrangement method for container ship deck area |
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