CN106443677A - Frequency-hopping spread spectrum communication system pseudo code ranging and angle measurement method - Google Patents
Frequency-hopping spread spectrum communication system pseudo code ranging and angle measurement method Download PDFInfo
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- CN106443677A CN106443677A CN201610858579.4A CN201610858579A CN106443677A CN 106443677 A CN106443677 A CN 106443677A CN 201610858579 A CN201610858579 A CN 201610858579A CN 106443677 A CN106443677 A CN 106443677A
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
Abstract
The invention provides a frequency-hopping spread spectrum communication system pseudo code ranging and angle measurement method. The method comprises the following steps: determining the installation position of each communication node according to the installation information of the node, the structure of a current communication network and the environmental information; calculating the correlation peaks of sum-difference three channels of a communication system pseudo code by using the discrete Fourier Transform method in the digital signal processing; detecting the presence or absence of a current area by using an adaptive threshold detection algorithm; detecting the azimuth position of the corresponding communication node, determining the number of moving objects, computing the target distance and a target angle, and determining a target location; performing tracking statistics on the current communication network node information. Based on a frequency-hopping spread spectrum communication system pseudo code ranging and angle measurement principle, the method can accurately detect and locate the nodes in the communication network, and provide the real-time positions of the communication nodes, and has a high-precision angle measurement and high-resolution range finding functions.
Description
Technical field
The present invention relates to Intelligent traffic information acquiring technical field, more particularly, to a kind of frequency hopping spread spectrum (FHSS) communication system pseudo-code survey
Away from, angle-measuring method.
Background technology
The more traffic information collection technology of application is road surface contact at present, and harvester is buried under road surface,
The change of corresponding pressure and electromagnetic field can be caused when automobile is above harvester, these changes are turned by harvester again
It is changed to required transport information.But this road surface contact traffic information collecting apparatus also have its shortcoming, install first and safeguard
Shi Bixu suspends traffic, destroys road surface, and maintenance cost is high；Next to that with the growth of use time, vehicle is for a long time to road
Pressure the detection performance of this kind of device can be led to reduce, certainty of measurement reduce；Adverse circumstances also can produce to its normal work
Detrimental effect is so as to service life shortens.
In the contactless traffic information collecting apparatus in road surface growing up in recent years, microwave detection system is with respect to other
Contactless device (such as tube video detecting device) have the advantages that easy maintenance, affected by weather environment little, by widely should
For Intelligent traffic information acquiring field.But, current microwave detection system is mostly applied to target detection and tests the speed, and has
Simple target can only be tested the speed, for example bayonet socket radar, this is accomplished by practical application installing a thunder in each track
Reach, but also a high hack lever will be filled so that cost greatly improves.Also there is the overspeed snapping thunder being applied to multilane in recent years
Reach, but wherein have typically can only identify a direction, have can only capture vehicle of driving over the speed limit, have to vehicle line ball travel
Detection is inaccurate, and the interference between each track also can affect to detect performance, wrong situation about clapping can often.
Content of the invention
For the drawbacks described above of prior art, the present invention provides a kind of frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging, angle-measuring method.
The frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging of present invention offer, angle-measuring method, including:
The installation position of mount message, the structure of present communications network and the environmental information each communication node of confirmation according to node
Put；
Calculate communication system pseudo-code and poor triple channel using the discrete Fourier transform method of Digital Signal Processing
Correlation peak respectively；
Have or not target using adaptive threshold detecting algorithm detection current region；
The position of orientation of detection respective communication node, and judge moving target number, calculate target range, target angle measurement,
Determine target location；
Present communications network nodal information is tracked count.
Method as above, described has or not target using adaptive threshold detecting algorithm detection current region, specially：
Cyclic convolution will be equivalent to the related operation of signal, Doppler frequency shift updated the frequency displacement corrected after the fft
In, realized using cyclic shift；
Circulation cross-correlation function between sequence a of two a length of N and b is:
Wherein, b '=(b (- n))N, take main value sequence to obtain after overturning sequence b periodic extension；Cyclic convolution for a and b；
In discrete Fourier transform, time domain cyclic convolution is equal to frequency domain and is multiplied：
Rab(m)=IDFT [Xa(k)·Xb(k)]=IDFT [Xa(k)·conj(Xb(k))],
Wherein, Xa(k)=DFT [a (n)], Xb(k)=DFT [b (n)], Xb(k)=conj [Xb(k)]；
Frequency domain displacement is equivalent to time domain frequency displacement:
Method as above, described calculating target angle measurement, by realizing with difference beam measuring angle by comparing amplitude, its
Principle formula is：
Wherein, FΔ(θ) it is and channel direction figure function, F∑(θ) it is difference channel direction figure function, k is proportionality coefficient, and θ is
Azimuth of target.
Method as above, described calculating target angle measurement, realized by interferometric phase method angle measurement, it is former
Managing formula is：
Wherein, d is the distance of two antennas, and λ is signal wavelength,For the phase difference of two echo-signals, θ is target bearing
Angle.
Method as above, wherein, the described discrete Fourier transform method using Digital Signal Processing calculates logical
Letter system pseudo-code and difference difference triple channel difference correlation peak, including：
With difference difference triple channel signal sampling；
Passage width phase compensates；
With difference difference Three-channel data clutter recognition；
Circular correlation capture based on FFT.
Method as above, wherein, described differs from triple channel signal sampling with difference, using A/D chip, by three antennas
The antenna echo of array received is converted into data signal from analog signal.
The frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging that the present invention provides, angle-measuring method include:According to the mount message of node, when
The structure of front communication network and the installation site of the environmental information each communication node of confirmation；Direct computation of DFT using Digital Signal Processing
Leaf transformation method calculates communication system pseudo-code and difference difference triple channel difference correlation peak；Calculated using adaptive threshold detecting
Method detection current region has or not target；The position of orientation of detection respective communication node, and judge moving target number, calculate target
Distance, target angle measurement, determine target location；Present communications network nodal information is tracked count.This method is based on to jump and expands
Frequency communication system pseudo-random code ranging, angle measuring principle, can accurately detect to the node in communication network, and it are carried out determine
Position, provides communication node accurate real time position, possesses the functions such as high precision angle measurement, high-resolution ratio range finding.
Brief description
Frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging that Fig. 1 provides for the present invention, the flow chart of angle-measuring method；
Fig. 2 is that the clock generation unit of the present invention divides theory diagram；
Fig. 3 is the transmitter module partial schematic block diagram of the present invention；
Fig. 4 is the receiver module partial schematic block diagram of the present invention.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, is clearly and completely described to the technical scheme in the present invention it is clear that described embodiment is only the present invention one
Section Example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
The every other embodiment being obtained under the premise of going out creative work, broadly falls into the scope of protection of the invention.
Frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging that Fig. 1 provides for the present invention, the flow chart of angle-measuring method.As shown in figure 1, jumping
Spread spectrum communication system pseudo-random code ranging, angle-measuring method specifically can include herein below.
S101, the mount message according to node, the structure of present communications network and environmental information confirm each communication node
Installation site.
In a particular application, this step can also further include：
Step 1：Installation site when dual-mode antenna array is fixing, installation luffing angle and setting height(from bottom)；
Step 2：The mobile highest of dual-mode antenna array, bottom line set it is thus necessary to determine that loading dual-mode antenna array car
Correct travel direction and driving vehicle vehicle；
Step 3：According to during the position correction nodal test target of aerial array in corresponding position.
S102, calculate communication system pseudo-code using the discrete Fourier transform method of Digital Signal Processing and differ from three
Passage correlation peak respectively.
In a particular application, this step can also further include：
Step 1：With difference difference triple channel signal sampling；
Step 2：Passage width phase compensates；
Step 3：With difference difference Three-channel data clutter recognition；
Step 4：Circular correlation capture based on FFT.
Described passage width phase compensates, and system should have amplitude-phase consistency with the sampling differing from three passages, but actual feelings
Condition can not be completely secured, and needs to be compensated accordingly according to system and noise characteristic.Described and difference difference Three-channel data is miscellaneous
Ripple suppresses, and using offseting wave filter, suppresses various clutters, to improve the signal to noise ratio of three passage echo-signals, reduces missing inspection, mistake
Inspection probability.The described circular correlation capture based on FFT, respectively to differ from three passage echo-signals do distance to FFT with
Orientation time FFT, to obtain the 2-d spectrum of echo-signal.Linear FM signal is done with the circular correlation capture based on FFT, because
And we can find moving-target position by code acquisition correlation peak-to-mean than peak.
S103, using adaptive threshold detecting algorithm detection current region have or not target.
In a particular application, this step can also further include：
Step 1：Adaptive environment interference noise threshold value is arranged；
Step 2：Moving-target self adaptation detection threshold detects.
S104, the position of orientation of detection respective communication node, and judge moving target number, calculate target range, target
Angle measurement, determines target location.
Described moving target number judges, due to the impact of the distribution of target scattering point and signal secondary lobe etc., a mesh
Mark often shows as multiple relevant peaks in 2-d spectrum, but their distribution has certain rule, so we need
To judge having several moving-targets according to peak-to-average force ratio in 2-d spectrum higher than the distribution of the point of detection threshold.
S105, present communications network nodal information is tracked count.
Method as above, wherein, described have or not target using adaptive threshold detecting algorithm detection current region, tool
Body is：
Cyclic convolution will be equivalent to the related operation of signal, Doppler frequency shift updated the frequency displacement corrected after the fft
In, realized using cyclic shift；
Circulation cross-correlation function between sequence a of two a length of N and b is:
Wherein, b '=(b (- n))N, take main value sequence to obtain after overturning sequence b periodic extension；Cyclic convolution for a and b；
In discrete Fourier transform, time domain cyclic convolution is equal to frequency domain and is multiplied：
Rab(m)=IDFT [Xa(k)·Xb(k)]=IDFT [Xa(k)·conj(Xb(k))],
Wherein, Xa(k)=DFT [a (n)], Xb(k)=DFT [b (n)], Xb(k)=conj [Xb(k)]；
Frequency domain displacement is equivalent to time domain frequency displacement:
Method as above, wherein, described target range and radial velocity calculate, can be according to several targets around
The distribution of point judges target's center's point, and according to the position of target's center's point corresponding apart from frequency with the calculation of orientation Doppler's frequency
Go out distance and the radial motion speed of target.Computing formula is as follows：
In formula, TpThe signal repetition time sending for communication node, r0Can reach in theory for radar system
The ultimate range resolution ratio arriving.
Method as above, wherein, described calculating target angle measurement, can be by surveying than width with difference beam
Angle is realized, and its principle formula is：
Wherein, FΔ(θ) it is and channel direction figure function, F∑(θ) it is difference channel direction figure function, k is proportionality coefficient, and θ is
Azimuth of target.
Method as above, wherein, described calculating target angle measurement, interferometric phase method angle measurement can be passed through
Realize, its principle formula is：
Wherein, d is the distance of two antennas, and λ is signal wavelength,For the phase difference of two echo-signals, θ is target bearing
Angle.
Method as above, wherein, the described discrete Fourier transform method using Digital Signal Processing calculates logical
Letter system pseudo-code and difference difference triple channel difference correlation peak, specifically can include：
With difference difference triple channel signal sampling；
Passage width phase compensates；
With difference difference Three-channel data clutter recognition；
Circular correlation capture based on FFT.
Method as above, wherein, described differs from triple channel signal sampling with difference, using A/D chip, by three antennas
The antenna echo of array received is converted into data signal from analog signal.
The frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging that the present invention provides, angle-measuring method include:According to the mount message of node, when
The structure of front communication network and the installation site of the environmental information each communication node of confirmation；Direct computation of DFT using Digital Signal Processing
Leaf transformation method calculates communication system pseudo-code and difference difference triple channel difference correlation peak；Calculated using adaptive threshold detecting
Method detection current region has or not target；The position of orientation of detection respective communication node, and judge moving target number, calculate target
Distance, target angle measurement, determine target location；Present communications network nodal information is tracked count.This method is based on to jump and expands
Frequency communication system pseudo-random code ranging, angle measuring principle, can accurately detect to the node in communication network, and it are carried out determine
Position, provides communication node accurate real time position, possesses the functions such as high precision angle measurement, high-resolution ratio range finding.
The present invention relates to frequency hopping spread spectrum (FHSS) communication system field, it is specifically related to a kind of frequency hopping spread spectrum (FHSS) communication system pseudo-code and expands to jumping
Every positional information between frequency communication network interior joint is detected, it is fixed that nodes multiple in frequency hopping spread spectrum (FHSS) communication system can be carried out
Position, possesses the functions such as high precision angle measurement, high-resolution ratio range finding, can apply to various complexity frequency hopping spread spectrum (FHSS) communication systems, meets state
Inside and outside most of frequency hopping spread spectrum (FHSS) communication system situation.
Fig. 2 is that the clock generation unit of the present invention divides theory diagram.As shown in Fig. 2 for the present invention clock generation unit divide former
Reason block diagram.Clock module is used for providing stable clock source, including the clock source of digital signal processing module system work, numeral
The local oscillation signal of Up/Down Conversion.Clock module mainly provides the local oscillator clock of 20M system clock and upper and lower frequency conversion；During system
Clock is directly supplied to digital module, then utilizes digital dock to distribute chip, is supplied to each several part and is used；Local oscillator clock is divided into two
Level, one-level is fixing 2.05GHz, and another level can be controlled switching frequency according to numerical portion.
Fig. 3 is the transmitter module partial schematic block diagram of the present invention.As shown in figure 3, it is partly former for the transmitter module of the present invention
Reason block diagram.The analog signal that digital module is brought is carried out intermediate frequency filtering by transmitter module, is then mixed with local vibration source, mixes
Frequently after complete, (bandwidth 20M, frequency is fixed tentatively as 8620.5～8640.5MHz), two-stage reach 20mW power after amplifying after filtering, profit
Launched with antenna.Transmitter module employing mixing scheme and digital local oscillator scheme twice, achievable 8378.5MHz～
Flexible frequency handover between 8878.5MHz.Transmitter module utilizes two local oscillation signals of clock module offer respectively at digital mould
The 70MHz intermediate frequency of block carries out being mixed and produces the required pumping signal of transmitting, transmission signal through a series of filtering, matching attenuation,
Drive amplification, finally 20mW is amplified to by power amplifier and exports antenna.
Fig. 4 is the receiver module partial schematic block diagram of the present invention.As shown in figure 4, it is partly former for the receiver module of the present invention
Reason block diagram, receiver module workflow is as follows：Receiver module reception antenna receives the radiofrequency signal of X-band, first passes through band a width of
The radio frequency analog wave filter of 500M is filtered, and reserve frequency is the signal of 8879.5MHz～9397.5MHz, then passes through work(
Put the power improving radiofrequency signal, then the one-level local oscillation signal through providing with clock module carries out down-converted again, will
Signal after down coversion is filtered through analog filter again, two grades of bases that filtered signal is provided then at clock module
The signal that shakes carries out down-converted, is then passed through an intermediate-frequency filter and obtains a 70M intermediate-freuqncy signal, is delivered to by SMA mouth
AD mouth.
The frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging of the present invention, angle-measuring method also reside in：Pseudo-code can be passed through, whole jump is expanded
Frequency communication system network is monitored, and is suitable for multinode network detection, possesses the function of communication node precision ranging, angle measurement,
Improve the cost performance of frequency hopping spread spectrum (FHSS) communication system；Can be on whole frequency hopping spread spectrum (FHSS) communication system and the positional information of each node is entered
Row scientific statistics；Artificial control is easy, because this method can be accurately positioned node, uses in multinode frequency hopping spread spectrum (FHSS) communication system
When, it is possible to achieve adaptive session spot net partition functionality, the present invention adopts self adaptation detection threshold detection algorithm, and detection performance is not
Affected by communication environment and noise jamming, can be worked long hours and centre is no longer necessary to artificial correction parameter, system maintenance
Convenient；
Finally it should be noted that：The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement made etc., should be included in the protection of the present invention
Within the scope of.
Claims (6)
1. a kind of frequency hopping spread spectrum (FHSS) communication system pseudo-random code ranging, angle-measuring method are it is characterised in that include:
The installation site of mount message, the structure of present communications network and the environmental information each communication node of confirmation according to node；
Calculate communication system pseudo-code and poor triple channel using the discrete Fourier transform method of Digital Signal Processing respectively
Correlation peak；
Have or not target using adaptive threshold detecting algorithm detection current region；
The position of orientation of detection respective communication node, and judge moving target number, calculate target range, target angle measurement, determine
Target location；
Present communications network nodal information is tracked count.
2. method according to claim 1, described using adaptive threshold detecting algorithm detection current region have or not target,
It is specially：
Cyclic convolution will be equivalent to the related operation of signal, Doppler frequency shift updated in the frequency displacement corrected after the fft, profit
Realized with cyclic shift；
Circulation cross-correlation function between sequence a of two a length of N and b is:
Wherein, b '=(b (- n))N, take main value sequence to obtain after overturning sequence b periodic extension；Cyclic convolution for a and b；
In discrete Fourier transform, time domain cyclic convolution is equal to frequency domain and is multiplied：
Rab(m)=IDFT [Xa(k)·Xb(k)]=IDFT [Xa(k)·conj(Xb(k))],
Wherein, Xa(k)=DFT [a (n)], Xb(k)=DFT [b (n)], Xb(k)=conj [Xb(k)]；
Frequency domain displacement is equivalent to time domain frequency displacement:
3. method according to claim 1 is it is characterised in that described calculating target angle measurement, by surveying than width with difference beam
Angle is realized, and its principle formula is：
Wherein, FΔ(θ) it is and channel direction figure function, F∑(θ) it is difference channel direction figure function, k is proportionality coefficient, and θ is target
Azimuth.
4. method according to claim 1 is it is characterised in that described calculating target angle measurement, by interferometric phase method angle measurement
Realize, its principle formula is：
Wherein, d is the distance of two antennas, and λ is signal wavelength,For the phase difference of two echo-signals, θ is azimuth of target.
5. method according to claim 1 is it is characterised in that the discrete Fourier transform of described utilization Digital Signal Processing
Method calculates communication system pseudo-code and difference difference triple channel difference correlation peak, including：
With difference difference triple channel signal sampling；
Passage width phase compensates；
With difference difference Three-channel data clutter recognition；
Circular correlation capture based on FFT.
6. method according to claim 5 is it is characterised in that described differs from triple channel signal sampling with difference, using AD core
Piece, the antenna echo of three antenna array receiver is converted into data signal from analog signal.
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Cited By (1)
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| CN111751782A (en) * | 2020-06-08 | 2020-10-09 | 西安思丹德信息技术有限公司 | Amplitude comparison angle measurement system and method based on FPGA |
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Application publication date: 20170222 |