CN105911520B - The recognition methods of moving object reflected radio signal - Google Patents
The recognition methods of moving object reflected radio signal Download PDFInfo
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- CN105911520B CN105911520B CN201610445802.2A CN201610445802A CN105911520B CN 105911520 B CN105911520 B CN 105911520B CN 201610445802 A CN201610445802 A CN 201610445802A CN 105911520 B CN105911520 B CN 105911520B
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/003—Bistatic radar systems; Multistatic radar systems
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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
- G01S5/0273—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 using multipath or indirect path propagation signals in position determination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
The invention discloses a kind of recognition methods of moving object reflected radio signal, the transmitting terminal in wireless transmission environments is wireless signal transmission equipment；Receiving terminal in wireless transmission environments is wireless signal receiver corresponding with transmitting terminal；It is characterized in that, it is not necessary to modify wireless signal transmission end and receiving devices, signal is received by the aerial array at reception of wireless signals end, the signal for merging direct path signal and stationary body reflection path by signal processing method is a static path signal, the angle of arrival of the signal of the angle of arrival and moving object reflection path of automatic identification static path signal during signal identification, to identify the wireless signal of moving object reflection.Technical solution of the present invention is low for equipment requirements, need not change hardware, can be deployed in common commercial wireless apparatus, implements quickly, conveniently, low cost, high benefit.
Description
Technical field
The present invention relates to wireless signal technical field more particularly to a kind of identification sides of moving object reflected radio signal
Method.
Background technology
Wireless signal reaches receiving terminal in transmission process, not only by the direct path between transceiver, simultaneously
Object (ground, people, the wall, furniture etc.) reflection that will also pass through in transmission environment reaches receiving terminal, this is also referred to as Multipath Transmission.
When receiving terminal uses antenna array receiver signal, the signal in different transmission path (direct path and reflection path) reaches should
The angle of aerial array is different, which is referred to as transmitting the angle of arrival of signal.When being deposited in the transmission space in wireless signal
There are one the object moved, object meeting reflected radio signal receiving end is received.If the movement can be told
Object reflects signal and its reaches angle, many physical messages in relation to the mobiles can be therefrom obtained, such as position, shape
Shape, movement locus etc..
However, the signal of different transmission path is finally superimposed, receiving end receives, it is necessary to be received by processing
Signal, the Signal separator of mobiles reflection path is come out and identifies its angle of arrival.
1986, U.S. Ralph O.Schmidt were in (the Multiple emitter location and of document 1
signal parameter estimation,IEEE transactions on antennas and propagation,AP-
34(3):276-280, Mar.1986) in propose a solution：Multiple signal classification algorithm (Multiple Signal
Classification, MUSIC), it is distinguished at receiving terminal aerial array using the method for autocorrelation matrix Eigenvalues Decomposition
The multiple incoming signals being superimposed, and estimate their own angle of arrival.However, this method requires the antenna of receiving terminal
The antenna number of array is more than incoming signal, all signaling zones could be separated and accurately estimated the angle of arrival of each signal in this way
Degree.When the antenna number of receiving terminal aerial array is less than the quantity of incoming signal, which can be the close incidence of several angles
Signal is identified as an incoming signal, causes the angle of arrival for the incoming signal being identified inaccurate.Disappear for daily
Take grade wireless signal transceiver, such as WiFi network interface cards, router, RFID card reader, is limited by cost and size, antenna number is past
Toward only 3-4 roots the application requirement of this method is cannot be satisfied far less than the signal number in general Multipath Transmission environment.
2013, Britain Xiong Jie were in 2 (ArrayTrack of document:A Fine-Grained Indoor Location
System, NSDI 13) in be put forward for the first time with the channel information of WiFi signal (Channel State Information,
CSI it) identifies the signal of direct path under Multipath Transmission environment as the input of MUSIC algorithms and estimates its angle of arrival, it should
Method is realized on open visit wireless platform (Warp), and needs 4-8 root antennas, this is difficult real on commercial WiFi network interface cards
It is existing.And this method is equally limited by antenna amount, can only ensure to identify direct path signal, can not ensure to identify dynamic
The reflection signal of object.
2014, the Jon Gjengset of Britain were in 3 (Phaser of document:Enabling Phased Array Signal
Processing on Commodity WiFi Access Points, Mobicom 14) in propose a kind of scheme, pass through company
Two pieces of commercialization WiFi network interface cards are connect and synchronized, to obtain 5 usable antennas, improve the estimation of the angle of arrival of direct path signal
Precision.However, this method is equally it cannot be guaranteed that identifying the reflection signal of moving object and estimating angle of arrival.
2015, the Manikanta Kotaru in the U.S. were in 4 (SpotFi of document:Decimeter Level
Localization Using WiFi, Sigcomm ' 15, P269-282) in propose a solution：Utilize WiFi network interface cards
The information on 30 subcarriers provided, increases the quantity of virtual-antenna, to reduce common WiFi network interface cards antenna number to signal
The influence of differentiation and angle of arrival estimation.However, this method is when being estimated signal and being distinguished, increases signal and arrive
Up to the dimension of time Estimate, identifiable number of paths can only be limitedly improved.In actual multipath transmisstion, in addition to directly logical
Outside the transmission path on road and the reflection path of moving object, there is also the transmission paths of many stationary bodies reflection.If there is
One signal reflected by stationary body, the arrival time and the signal of moving object reflection for reaching receiving terminal reach receiving terminal
The arrival time of aerial array is sufficiently close to, and is limited by actual physics antenna amount, the two incoming signals also can be multiple
The wireless signal of moving object reflection can not be recognized accurately as a signal identification in signal sorting algorithm.In true room
It in interior environment, is limited by space, when the arrival of the signal of arrival time and the dynamic object reflection of the signal of stationary body reflection
Between be sufficiently close to, can be identified as a signal by multiple signal classification algorithm.In addition to this, which can not
It distinguishes in the incoming signal being identified, which signal is the signal reflected by moving object, which is stationary body reflection
Signal.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of identification side of moving object reflected radio signal
Method can not appoint hardware using the coherence of signal under the limitation of the finite antenna quantity of commercial wireless transceiver
What is changed, and signal is received by using the aerial array at reception of wireless signals end, by signal processing method unrelated straight
The signal of path signal and stationary body reflection is connect as an incoming signal --- static path signal reduces what needs identified
Number of signals, while estimating the angle of arrival of the static path signal and the signal of moving object reflection, and estimate from these
The angle of arrival of the wireless signal of moving object reflection is identified in the angle of arrival of the signal gone out.
The principle of the present invention is：It is relevant between the signal of direct path and the signal of all stationary body reflection paths
, when using multi-signal sorting algorithm (Multiple Signal Classification (MUSIC)), coherent signal can quilt
Merge as a signal, will not be distinguished, in the present invention, it is (relevant to reduce irrelevant signal using the coherence of signal
Stationary body reflection path signal and direct path signal).The present invention claims the coherent signal for being merged into a signal
For static path signal；And the reflection signal of moving object is referred to as dynamic route signal.Static path signal and dynamic route
Signal is incoherent, in the case of sufficient antenna amount, can be accurately distinguished open by MUSIC algorithms and estimate angle of arrival
Degree.In this way, even if there is many stationary bodies reflection signals in the environment, but need signal that is identified and estimating angle of arrival only
The dynamic route signal of static path signal and several moving object reflection after merging including one, greatly reduces needs
The number of signals of identification reduces the requirement to antenna number so that under the finite antenna number of commercial wireless signal sending and receiving equipment,
Also it can identify and estimate the angle of arrival of the reflection signal of moving object.In addition to this, higher using static path signal
The reflection signal of stability and moving object sometimes can not the characteristic that receives of receiving end, the present invention is by comparing in shorter window
The interior stability difference being identified according to each angle distinguishes the reflection signal of moving object and arriving for static path signal automatically
Up to angle.
Technical solution provided by the invention is：
A kind of method of estimation of the recognition methods and angle of arrival of moving object reflected radio signal, it is not necessary to modify hardware to set
It is standby, signal is received by using the aerial array at reception of wireless signals end, unrelated is directly led to by signal processing method
Road signal and the signal fused of stationary body reflection are a static path signal, reduce and need identified number of signals, together
When estimate the static path signal and moving object reflection signal angle of arrival, and the signal estimated from these to
Up to the angle of arrival for the wireless signal for identifying moving object reflection in angle；Include the following steps：
1) it builds an antenna spacing using the limited antenna of receiving terminal and is no more than used wireless signal wavelength half
Linear antenna array；
Transmitting terminal is wireless signal transmission equipment (such as WiFi equipment, RFID tag)；Receiving terminal is corresponding with transmitting terminal
Wireless signal receiver builds linear antenna array with existing antenna；For example, commercialization WiFi receive-transmit systems are used, it can
To use the WiF signals of 2.4GHz or 5GHz, common commercial Wi-Fi network interface cards to support three antennas of connection, structure can be used for
The linear antenna array of a triantennary is built, antenna spacing is no more than the WiFi signal of used 2.4GHz or 5GHz
Half-wavelength.The wavelength of interval signal used by specific wireless signal transceiver of aerial array determines.In addition,
If certain wireless systems can provide more antennas and build aerial array, better effect can be obtained, such as common RFID is read
4 antennas can be provided by writing device.
In one embodiment of the invention, wireless signal transmission equipment is WiFi equipment；Wireless signals reception equipment sets for WiFi
It is standby；Wireless signal is 2.4GHz or 5GHz signals；Antenna amount in linear antenna array is three.In specific implementation,
It is also an option that RFID tag is as wireless signal transmission equipment；Wireless signals reception equipment is RFID reader；Wireless signal
For wireless signal used in RFID device；Antenna amount in linear antenna array is four.
2) channel information in receiving terminal acquisition different antennae；
Common wireless signal receive-transmit system can provide channel information to describe to shake after signal is transmitted by wireless channel
The decaying and phase shift that the variation of width and phase --- wireless channel is brought.Such as in commercial WiFi equipment, channel information is general
Channel status information (Channel State Information (CSI)) is shown as, it embodies wireless signal and is sent out from transmitting terminal
It is transmitted by wireless channel after going out and reaches amplitude decaying and phase drift caused by receiving terminal.Assuming that the aerial array of receiving terminal
It is made of M root antennas, in sampling instant t, obtains the channel information of M root reception antennas respectively acquired, constitute aerial array letter
Number vector X (t)：
In formula 1, xm(t) it is collected channel information on m root antennas；N indicates to reach the difference of receiving antenna array
The signal number in path；θiIndicate that the signal of the i-th paths reaches the angle of arrival of the aerial array of receiving terminal；a(θi) indicate i-th
Guiding vector of the signal of paths on the aerial array of receiving terminal；si(t) it is that the signals of the i-th paths reaches receiving terminal day
The decaying and phase shift of first antenna of linear array；N (t) is noise vector.
The transmission path of the signal reflected due to direct path signal and stationary body stablize at any time it is constant, mutually
Between centre frequency having the same and fixed phase difference, therefore these signals are relevant.S is used in the present inventions,1(t) table
Show that direct path signal reaches the decaying and phase shift of receiving terminal first antenna of aerial array, then direct path and stationary body are anti-
The decaying and phase shift of i-th of signal, first antenna of arrival in the signal set of rays diameter are ss,i(t)=αs,iss,1(t),
αs,iIt is the fixed skew of the signal and direct path signal, is a constant.The signal of moving object reflection (believe by dynamic route
Number) transmission path constantly change over time, therefore with static path signal have time-varying phase difference, be each other
It is incoherent.Therefore, in the presence of the object for having movement is in wireless transmission environments, the signal vector of aerial array is：
In formula 2, X (t) is the signal vector for the aerial array for having M root antennas in t moment；xm(t) it is on m root antennas
Collected channel information；N indicates to reach the signal number in the different paths of receiving antenna array；θiIndicate the letter of the i-th paths
Number reach receiving terminal aerial array angle of arrival；a(θi) indicate the signal of the i-th paths on the aerial array of receiving terminal
Guiding vector；si(t) be the i-th paths signal reach receiving terminal aerial array first antenna decaying and phase shift；N
(t) it is noise vector；nsBe direct path and all stationary body reflection paths signal set in signal sum；nmIt is fortune
The signal number of animal body reflection；ss,1(t) indicate direct path signal reach receiving terminal first antenna of aerial array decaying and
Phase shift；ss,i(t)=αs,iss,1(t) the i-th paths in the signal set of direct path and stationary body reflection path are indicated
Signal reaches the decaying and phase shift of first antenna, αs,iIt is the fixed skew constant of the signal and direct path signal；θs,i
Indicate that the signal of the i-th paths in the signal set of direct path and stationary body reflection path reaches the antenna array of receiving terminal
The angle of arrival of row；a(θs,i) indicate the letters of the i-th paths in the signal set of direct path and stationary body reflection path
Guiding vector number on the aerial array of receiving terminal；sm,i(t) indicate that i-th of dynamic reflective path signal reaches receiving terminal day
The decaying and phase shift of first antenna of linear array；θm,iIndicate that the signal in i-th dynamic reflective path reaches the antenna array of receiving terminal
The angle of arrival of row；a(θm,i) indicate guiding vector of the signal in i-th dynamic reflective path on the aerial array of receiving terminal.
Direct path signal and the signal of all stationary bodies reflection melt in formula 2 as a signal, in the present invention by
Referred to as static path signal, guiding vector are the guiding vectors of direct path signal and each stationary body reflection path signal
Superposition, the decaying and phase shift of first antenna of arrival are exactly decaying and phase shift that direct path signal reaches first antenna.
3) it is sampled as inputting several times with the signal vector of antenna array receiver, runs MUSIC algorithms；
Multiple signal classification algorithm (Multiple Signal Classification, MUSIC) is U.S. Ralph
O.Schmidt document 1 (Multiple emitter location and signal parameter estimation,
IEEE transactions on antennas and propagation,AP-34(3):276-280, Mar.1986) in note
The multiple signal classification method of load can be classified (quiet after fusion by each signal obtained in above-mentioned formula 2 using this method
State path signal and other dynamic route signals) and estimate that its guiding vector obtains arrival angle information.If dynamic route is believed
Number presence and receiving end receives, the output of MUSIC algorithms are exactly to identify a static path signal and at least one dynamic
Parameter-angle of arrival of state path signal and these signals；
4) angle of arrival of automatic identification dynamic route signal：Each path is repeatedly identified in a shorter time window
Signal and angle of arrival distinguish using the difference of static path signal and dynamic route signal stabilization and belong to dynamic road
The angle of arrival of diameter signal；Thus static path signal and dynamic route signal are identified；The angle of arrival of dynamic route signal
It is exactly the angle of arrival of moving object reflection signal.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention provides a kind of recognition methods of moving object reflected radio signal, utilizes multi-signal sorting algorithm
(Multiple Signal Classification (MUSIC)) and signal coherency, by unrelated direct path signal and quiet
The signal of state object reflection merges into a signal, accurately distinguishes out the reflection signal (dynamic route signal) of moving object and quiet
State path signal and its angle of arrival.The present invention has saved identification dynamic route signal to antenna number by merging irrelevant signal
Requirement so that can be realized on wireless transmitting-receiving equipments used in everyday to mobilizing exercises object reflection signal identification and
The estimation of its angle of arrival information can be into using the dynamic route signal and static path signal and its angle of arrival identified
One step identifies and understands the behavior of moving object in environment.
The method provided by the present invention is low for equipment requirements, is realized on some common commercial wireless signal transceivers, it is only necessary to
Existing 3-4 roots antenna can be achieved with, and need not change hardware, and therefore, technical solution provided by the invention can be deployed in often
On the commercial wireless apparatus seen (such as WiFi network interface cards, WiFi routers, RFID reader), implement quickly, conveniently, low cost,
High benefit.
Description of the drawings
Fig. 1 is the Wi-Fi aerial array receive-transmit systems built in the embodiment of the present invention；
Wherein, (a) is transmitting terminal (Wi-Fi equipment)；(b) it is that receiving terminal (is equipped with the Wi-Fi nets of linear antenna array
Card, Wi-Fi network interface cards support three antenna openings, are separately connected three antennas, and antenna spacing is no more than half-wavelength).
Fig. 2 is the method flow block diagram of the angle of arrival of the reflection signal for the people that movement is identified in the embodiment of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention, the model of but do not limit the invention in any way are further described by embodiment
It encloses.
The present invention provides a kind of moving object reflected radio signal recognition methods, based on wireless signal antenna array transmitting-receiving system
System and processing server, using multi-signal sorting algorithm (Multiple Signal Classification (MUSIC)) by phase
Dry signal merges into a signal, accurately distinguishes out the reflection signal (dynamic route signal) and static path signal of moving object
And identify its angle of arrival.Include the following steps：
1) wireless signal antenna array receive-transmit system, including transmitting terminal and receiving terminal are built；Receiving terminal is connect with aerial array
Receive wireless signal；
Transmitting terminal is wireless signal transmission equipment (such as WiFi equipment, RFID tag)；Receiving terminal is corresponding with transmitting terminal
Wireless signal receiver builds linear antenna array with existing antenna；Using commercialization in embodiment of the present invention
WiFi receive-transmit systems, and using the WiF signals of 5GHz, common commercial Wi-Fi network interface cards support three antennas of connection, can be used for
The linear antenna array of a triantennary is built, the half-wavelength of WiFi signal of the antenna spacing no more than 5GHz is (such as Fig. 1 institutes
Show).The wavelength of interval signal used by specific wireless signal transceiver of aerial array determines.In addition, if
Certain wireless systems can provide more antennas and build aerial array, can obtain better effect, such as common RFID reader
4 antennas can be provided.
2) channel information in the different antennae of receiving terminal acquisition aerial array；
WiFi network interface cards are used in embodiment of the present invention, the channel information that receiving terminal acquires in different antennae is each antenna
On the CSI information that measures；
3) every time sampling obtain receiving terminal aerial array in every antenna measurement to channel information and construct signal
Vector；
With the sampling several times of the signal vector of antenna array receiver (specific number determines by sample frequency and antenna number,
In embodiment of the present invention, 3 reception antennas, 2000Hz sample frequencys are sampled as inputting with 90 every time；General 10 or more
Sample effect it is relatively good；Sample frequency is relatively good in 1000Hz or more) it is input, MUSIC algorithms are run, each of identification is exported
The signal in a path simultaneously estimates that its guiding vector obtains arrival angle information：If dynamic route signal exists and is received termination
It receives, the output of MUSIC algorithms is exactly to identify a static path signal and at least one dynamic route signal (specifically by day
Line number amount and physical presence dynamic route number of signals determine) and these signals parameter --- angle of arrival；
4) angle of arrival of automatic identification dynamic route signal；
(15 times or more) each path signals of estimation of (0.3s or more) continuous several times arrives in one section of shorter time window
Up to angle, the angle of arrival that can be identified always is the angle of arrival of static path signal；Due to the letter of moving object reflection
Number weaker and can not reach receiving terminal sometimes, undetectable angle is exactly the angle of arrival of dynamic route signal sometimes, such as
Continuous 20 measurements, at least 1 time detection is less than then the angle belongs to the angle of arrival of dynamic route signal；
In embodiments of the present invention, the probability being detected according to path signal distinguishes static path signal and dynamic road
Diameter signal：The path signal that energy 100% is detected is static path signal, and the angle being detected is static path signal
Angle of arrival；Remaining is dynamic route signal, and the angle being detected is the angle of arrival of dynamic route signal；
5) angle of arrival of dynamic route signal is exactly the angle of arrival of the signal of moving object reflection, thus identifies fortune
The signal of animal body reflection simultaneously estimates its angle of arrival.
Following embodiment uses common Wi-Fi equipment as signal transmitting terminal, with everyday commerce WiFi network interface cards (such as Intel
5300 network interface cards, Atheros AR9580 network interface cards, Atheros AR9590 network interface cards etc.) it is mounted on a PC as signal
Receiving terminal, the freely activity in transmission environment that there are one people identify that the reflection of the movable people is believed with the method provided by the present invention
Number and signal angle of arrival, include the following steps：
1) system is built：
Three antenna openings supported with business WiFi network interface cards are separately connected three antennas, and one antenna spacing of structure is no more than
The linear antenna array of half-wavelength, as shown in Figure 1.Using 5300 network interface cards of Intel come the system of building in present example,
Use the WiFi signal of 5GHz, 40MHz bandwidth.This example is made of 1 transmitting terminal, 1 receiving terminal, 1 server.
The reflection signal of moving object and its flow such as Fig. 2 of the detailed process of angle of arrival are identified using the aerial array
It is shown, include the following steps：
2) transmitting terminal uses 1 transmitting antenna, with the 2000 per second rate transmission signals wrapped (each corresponding primary letter of packet
Road samples, and is equivalent to the sample rate of 2000Hz here；It is general relatively good using the rate of 1000Hz or more), the antenna of receiving terminal
The array received signal, and acquire channel information and be sent to server.
On WiFi network interface cards, channel information is by channel state information (Channel State Information) come table
Show, this example uses 5300 network interface cards of Intel, and using the WiFi signal of 5GHz, the bandwidth of 40MHz, transmitting terminal passes through 1 antenna
Emit signal, the linear antenna array that receiving terminal is constituted with 3 antennas receives signal, often receives a WiFi signal
Packet, 5300 network interface cards of Intel of receiving terminal can all obtain 90 CSI information, wherein each pair of dual-mode antenna is in 30 subcarriers
It is upper to obtain corresponding 30 CSI information, 3 pairs of dual-mode antennas pair, totally 90 CSI information.
3) for the WiFi packets received in t moment, a fixed subcarrier is selected, obtaining 3 CSI information compositions should
The received signal vector of aerial array；
One fixed subcarrier, example are selected for 3 antennas of receiving terminal for the WiFi packets received in t moment
Such as the 10th sub-carriers, the received signal vector that 3 CSI information constitute the aerial array can be obtained：X (t)=[x1(t),x2
(t),x3(t)]T。
4) signal vector that the metrical information of multiple WiFi packets constitutes multiple repairing weld runs MUSIC algorithms as input, defeated
Go out the angle of arrival of each path signal；
For WiFi network interface cards, each packet provides major channel information sampling, and (10 or more imitate the enough sufficient amount of packets of caching
Fruit is preferable, with specific reference to transmitting packet rate and available antenna number determine, this example use 90) metrical information constitute signal
Vector runs MUSIC algorithms and exports the angle of arrival of each path signal as input.
5) angle of arrival of automatic identification dynamic route signal：
This example continuously identifies in 0.4s and estimates the angle of arrival 20 times of each path signal, calculates each angle and is visited
The number measured, can 100% angle that is detected be static path signal angle of arrival, at least 1 time it is unrecognized go out
Angle be activity people reflect signal angle of arrival.
It should be noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but the skill of this field
Art personnel are appreciated that：It is not departing from the present invention and spirit and scope of the appended claims, various substitutions and modifications are all
It is possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with claim
Subject to the range that book defines.
Claims (7)
1. a kind of recognition methods of moving object reflected radio signal, the transmitting terminal in wireless transmission environments is wireless signal transmission
Equipment；Receiving terminal in wireless transmission environments is wireless signal receiver corresponding with transmitting terminal；It is characterized in that it is not necessary to modify nothings
Line signal transmitting terminal and receiving device, by using the antenna array receiver signal at reception of wireless signals end, at signal
Reason method detaches and identifies the wireless signal of moving object reflection, includes the following steps：
1) a linear antenna array is built using the antenna at reception of wireless signals end；In the linear antenna array
Antenna amount be at least three；Interval between the more antennas is no more than the half of used wireless signal wavelength；
2) receiving terminal acquires the channel information on more antennas in the linear antenna array, constitute antenna array signals to
Amount；The channel information indicates that wireless signal is sent out from transmitting terminal antenna and receives institute by wireless channel transmission receiving end antenna
The decaying and phase shift of generation；The antenna array signals vector is obtained by the structure of formula 1：
The aerial array of setting receiving terminal is made of M root antennas, in sampling instant t, obtains respectively acquiring for M root reception antennas
Channel information constitutes antenna array signals vector X (t) by formula 1：
In formula 1, xm(t) it is collected channel information on m root antennas；N indicates to reach the different paths of receiving antenna array
Signal number；θiIndicate that the signal of the i-th paths reaches the angle of arrival of the aerial array of receiving terminal；a(θi) indicate the i-th paths
Guiding vector of the signal on the aerial array of receiving terminal；si(t) be the i-th paths signal reach receiving terminal aerial array
First antenna decaying and phase shift；N (t) is noise vector；
In the presence of having moving object in wireless transmission environments, the antenna array signals vector is expressed as formula 2：
In formula 2, X (t) is the signal vector for the aerial array for having M root antennas in t moment；xm(t) it is to be acquired on m root antennas
The channel information arrived；N indicates to reach the signal number in the different paths of receiving antenna array；θiIndicate that the signal of the i-th paths arrives
Up to the angle of arrival of the aerial array of receiving terminal；a(θi) indicate the i-th paths signal leading on the aerial array of receiving terminal
To vector；si(t) be the i-th paths signal reach receiving terminal aerial array first antenna decaying and phase shift；N(t)
It is noise vector；nsBe direct path and all stationary body reflection paths signal set in signal sum；nmIt is moving object
The signal number of body reflection；ss,1(t) indicate that direct path signal reaches the decaying and phase of receiving terminal first antenna of aerial array
It moves；ss,i(t)=αs,iss,1(t) letter of the i-th paths in the signal set of direct path and stationary body reflection path is indicated
Number reach first antenna decaying and phase shift, αs,iIt is the fixed skew constant of the signal and direct path signal；θs,iTable
Show that the signal of the i-th paths in the signal set of direct path and stationary body reflection path reaches the aerial array of receiving terminal
Angle of arrival；a(θs,i) indicate the signals of the i-th paths in the signal set of direct path and stationary body reflection path
Guiding vector on the aerial array of receiving terminal；sm,i(t) indicate that i-th of dynamic reflective path signal reaches receiving terminal antenna
The decaying and phase shift of first antenna of array；θm,iIndicate that the signal in i-th dynamic reflective path reaches the aerial array of receiving terminal
Angle of arrival；a(θm,i) indicate guiding vector of the signal in i-th dynamic reflective path on the aerial array of receiving terminal；
3) it using the multiple repairing weld of antenna array signals vector described in step 2) as input, is carried out by multiple signal classification algorithm
Modulation recognition and the angle of arrival for estimating signal, it is one that relevant direct path signal and all stationary bodies reflection signal, which is melted,
A signal, described melt are identified as static path signal for one signal；The wireless signal that moving object is reflected is identified as
Dynamic route signal；The static path signal and the dynamic route signal are irrelevant；
Step 3) is by estimating that the angle of arrival of signal identifies the moving object reflected radio signal, especially by one
Between repeatedly detect in window, identify the angle of arrival of the angle of arrival and dynamic route signal of static path signal, pass through static state
The difference of path signal and dynamic route signal stabilization distinguishes the angle of arrival for belonging to dynamic route signal.
2. the recognition methods of moving object reflected radio signal as described in claim 1, characterized in that the wireless signal transmission
Equipment is WiFi equipment or RFID tag；The wireless signals reception equipment is WiFi equipment corresponding with transmitting equipment or RFID
Reader.
3. the recognition methods of moving object reflected radio signal as described in claim 1, characterized in that the wireless signal transmission
Equipment is WiFi equipment；The wireless signals reception equipment is WiFi equipment；The wireless signal is 2.4GHz or 5GHz signals；
Antenna amount in the linear antenna array is three.
4. the recognition methods of moving object reflected radio signal as described in claim 1, characterized in that the wireless signal transmission
Equipment is RFID tag；The wireless signals reception equipment is RFID reader；Antenna in the linear antenna array
Quantity is four.
5. the recognition methods of moving object reflected radio signal as described in claim 1, characterized in that step 3) is described to be sampled as
10 times or more；Sample frequency at least 1000Hz.
6. the recognition methods of moving object reflected radio signal as described in claim 1, characterized in that step 3) the multiple letter
Number sorting algorithm be document 1 (Multiple emitter location and signal parameter estimation,
IEEE transactions on antennas and propagation,AP-34(3):276-280, Mar.1986) in note
The multiple signal classification method MUSIC of load.
7. the recognition methods of moving object reflected radio signal as described in claim 1, characterized in that described in a time window
It is repeatedly detected in mouthful, the time window is 0.3s or more；Described is repeatedly 15 times or more；At least 1 in multiple detection process
Secondary undetectable direction of arrival degree is identified as the angle of arrival of dynamic route signal.
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