CN107356900A - A kind of multichannel receiver signal imitation method under linear array - Google Patents
A kind of multichannel receiver signal imitation method under linear array Download PDFInfo
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- CN107356900A CN107356900A CN201710600944.6A CN201710600944A CN107356900A CN 107356900 A CN107356900 A CN 107356900A CN 201710600944 A CN201710600944 A CN 201710600944A CN 107356900 A CN107356900 A CN 107356900A
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/74—Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals
Abstract
The present invention relates to electronic reconnaissance field.Purpose is to provide a kind of multichannel receiver signal imitation method under linear array, and the analogy method comprises the following steps：(1) linear array signal model is established；(2) each channel receiving signal delay inequality extraction of linear array antenna, while generate baseband modulation signal；(3) each array element delay inequality loading of linear array antenna；(4) up-conversion is to radiofrequency signal；(5) radiofrequency signal of launching simulation.The present invention can simulate the direction-finding signal under linear array, be available for direction-finding system to carry out simulating, verifying, can be in the case of without outfield experiments, and direction-finding system carries out related experiment checking, effectively convenient, not only shortens experimental period and also greatly saves R＆D costs.
Description
Technical field
The invention belongs to electronic reconnaissance field, and in particular to multichannel receiver signal imitation side under a kind of linear array
Method.
Background technology
The seventies of last century six, foreign countries begin to carry out the research of signal imitation technology, taken on technology is realized
Great success is obtained, there is the design that many big companies specialize in signal simulator, as Camber companies of U.S. handle develops
Radar Toolkit software successful implantations into signal simulator, modeling to nearly 20 kinds of radar systems and imitative can be used for
Very.And the domestic research to signal imitation technology is started late, until the scientific research department of the last century the nineties country just opens
Beginning carries out the research of radar simulation work, is simulated by changing the relative time delay of signal between direction-finding system and unknown object
Deflection.
But current static immobilization signal imitation technology is most of also more dull, and is directed to radar signal more.In actual feelings
Under condition, alignment system reception signal includes all kinds signal, not exclusively radar signal.If in the situation of outfield experiments
Under, direction-finding system carries out related experiment checking, and not only the R＆D cycle is grown, and R＆D costs are also very high.
The content of the invention
In view of this, multichannel receiver signal imitation method under a kind of linear array provided by the invention, the simulation skill
Art shortens the experimental period of direction-finding system and reduces R＆D costs.
For achieving the above object, the technical solution adopted in the present invention is：Multichannel receives under a kind of linear array
Machine signal imitation method, comprises the following steps：
(1) linear array signal model is established, sets target transmission signal is s (t)：
Wherein, u (t) is baseband modulation signal, fcFor signal center frequency；
(2) each channel receiving signal delay inequality of linear array antenna is extracted, while generates baseband modulation signal, then passage k
Delay inequality between passage 1 is：
τK~1=-dK~1/ c=- (l1+...+lK~1)·sin(θ)/c；
Wherein, c refers to the light velocity, l1Refer to the baseline length between array element 2 and array element 1, lk-1Between finger array element k and array element k-1
Baseline length, dK~1Refer to the distance between passage k and passage 1, θ refers to transmission signal arrival bearing；
(3) each array element delay inequality loading of linear array antenna, signal after each array element delay inequality loading is obtained
(4) up-conversion is to radiofrequency signal, and output signal carries out upper change after being loaded to each array element delay inequality of linear array antenna
FrequentlyProcessing；
(5) radiofrequency signal of launching simulation, the radiofrequency signal that the antenna receiving unit of receiving platform receives is r (t)：
Wherein, τK~1For the delay inequality between passage k and passage 1,For the phase compensation parameter of carrier frequency.
Preferably, the baseband modulation signal u (t) is produced by baseband modulation signal model.
Preferably, baseband modulation signal u (t) type is radar signal or general communication signal.
Preferably, the delay inequality τK~1It is calculated by linear array antenna model.
Preferably, the step (3) is completed by Delay model, the delay inequality τ that step (2) is calculatedK~1It is loaded onto phase
Answer on the baseband modulation signal u (t) of array element.
Preferably, the step (4) is completed by up-conversion model.
Preferably, the linear array antenna element number of array is 3.
Preferably, delay inequality τ in the step (2)K~1Computational methods specifically include：
The first step, it is θ that user, which sets the arrival bearing of objective emission signal, and linear array antenna element number of array is N
Baseline length between each array element is l；
Second step, according to user's arrange parameter, calculate the delay inequality τ between array element k and array element 1K~1。
Preferably, the step (3) specifically includes：
The first step, delay inequality loading is carried out to signal using group delay；
Y (n)=x (n-n0)；
Wherein, x (n-n0) it is filter input signal, n0It is delayed for flora of filters；
Second step, the baseband modulation signal after being loaded to delay inequality carry out carrier phase compensation.
The invention has the advantages that：In the inventive solutions, the present invention can be simulated under linear array
Direction-finding signal, for direction-finding system carry out simulating, verifying, can in the case of without outfield experiments, direction-finding system carry out phase
Experimental verification is closed, it is effectively convenient, not only shorten experimental period and also greatly save R＆D costs.And signal mode provided by the invention
Plan technology does not limit signal type, applied widely, and adaptive analog signal is provided for alignment system.
Brief description of the drawings
Fig. 1 is the general frame of the present invention；
Fig. 2 is overview flow chart of the present invention；
Fig. 3 is linear array antenna schematic diagram of the present invention；
Fig. 4 is radar baseband signal analogous diagram of the present invention；
Fig. 5 is present invention communication QPSK baseband signal analogous diagrams；
Fig. 6 is each communication channel delay analogous diagram of radar signal of the present invention；
Fig. 7 is present invention communication each communication channel delay analogous diagram of QPSK signals.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, belongs to the scope of protection of the invention.
With reference to shown in Fig. 1, multichannel receiver signal imitation method includes baseband modulation signal mould under a kind of linear array
Type, linear array antenna model, Delay model and up-conversion model.The baseband modulation signal model generates each passage institute
Need baseband modulation signal；The arrival angular direction that the linear array antenna model is set according to user obtains each channel analog signal
Delay inequality；The delay inequality of each channel analog signal obtained according to linear array antenna model, the Delay model will
Delay inequality is loaded onto on corresponding baseband modulation signal；The up-conversion model will be loaded with the baseband modulation signal root of delay inequality
According to up-conversion formula up-conversion to radio frequency, the radiofrequency signal at correspondence direction angle under current antenna model is simulated.
With reference to shown in Fig. 2, the reception signal that the present invention simulates the linear array antenna for direction finding uses following steps：
(1) linear array signal model is established；
(2) each channel receiving signal delay inequality extraction of linear array antenna, while generate baseband modulation signal；
(3) delay inequality loads；
(4) up-conversion is to radiofrequency signal；
(5) radio frequency analog signal is launched.
Further, the particular content of the step (1) is：Sets target transmission signal is s (t) first
The signal that then the antenna receiving unit of direction finding receives is r (t)
Wherein, s (t) is the objective emission signal set according to customer parameter, and signal is the carrier of information, and linear array is believed
Number model is stated with complex signal.U (t) is the signal modulation style that baseband modulation signal model is set according to user and modulation ginseng
The baseband modulation signal of number generation, fcFor signal center frequency.R (t) be final output radio frequency analog signal, τK~1For passage k
With the delay inequality between passage 1,Linear array antenna model is obtained for Delay model
The delay inequality of each channel analog signal is loaded onto on the baseband modulation signal of respective channel, u (t- τK~1) add for baseband signal u (t)
Carry delay inequality τK~1Delay time signal afterwards, andFor the phase compensation parameter of carrier frequency, because entering line delay in radiofrequency signal
When, carrier phase variable quantity and delay inequality τK~1It is directly proportional, therefore carrier phase need to be compensated.Produced for up-conversion model
Raw up-conversion information.
Further, with reference to shown in Fig. 3, the particular content of the step (2) is：First, the objective emission that user is set
The arrival bearing of signal and the angle of normal direction are θ, and the normal direction is 0 °, the incoming wave side of the objective emission signal
The angle change value to be turned clockwise to the angle with normal direction is 0 ° -360 °, and user sets the array element of linear array antenna
Number is that the baseline length between N and each array element is l, and corresponding channel number is also N, and the passage refers to that transmission signal reaches
The signal path of each array element.Then, the target of transmission signal is considered as far-field radiation source, the time delay of each channel receiving signal
Value τkWith the distance d of signal to each passagekIt is directly proportional, then delay inequality τK~1With range difference dK~1It is directly proportional, the delay inequality τK~1It is
On the basis of passage 1, the delay between passage k and passage 1, the range difference dK~1It is passage k and passage on the basis of passage 1
The distance between 1.Then when arrival bearing is θ, the delay inequality between other passages and passage 1 is：
τK~1=-dK~1/ c=- (l1+...+lK~1)·sin(θ)/c
Wherein, c refers to the light velocity, l1Refer to the baseline length between array element 2 and array element 1, lk-1Refer to array element k and array element k-1
Between baseline length, be delayed and represent that current channel k signal lags than passage 1 for timing；Represent current logical when being delayed to bear
Road k signal is more advanced than passage 1.
Meanwhile modulated signal type and Modulation Signal Parameters are set according to user, obtain required baseband modulation signal.It is described
Modulated signal type includes radar signal and general communication signal etc..The Modulation Signal Parameters are different according to modulated signal type
It is also not exclusively the same to load signal parameter content, when modulated signal type is radar signal, Modulation Signal Parameters include center
Frequency fc, pulsewidth τ, pulse repetition period PRI.When modulated signal type is general communication signal, Modulation Signal Parameters include
Centre frequency fc, code speed, roll-off factor.Because before delay inequality is loaded, the baseband modulation signal of each passage is the same, base
The baseband modulation signal of a passage can be only produced with modulated signal model, when follow-up each passage carries out delay inequality loading, all
Using this baseband modulation signal, baseband modulation signal model amount of calculation and algorithm complex are reduced.
As shown in figure 4, the objective emission signal simulated is set as normal radar signal, the radar signal centre frequency fc
Be 1us for 500MHz, pulsewidth τ, pulse repetition period PRI be 1ms.Fig. 4 is to generate two-way just according to radar signal parameter setting
I, the Q signal of friendship, the part slightly wider than radar pulsewidth have only been intercepted in Fig. 4, other are zero, do not influence the place of follow-up signal
Reason, and sample rate is 12GHz.
As shown in figure 5, the objective emission signal simulated is set as general communication QPSK signals, the general communication QPSK letters
Number centre frequency fcIt is 10Msps, uses roll-off factor to be generated for 0.35 root raised cosine filter for 500MHz, code speed.Figure
5 be to set the orthogonal I of the two-way of generation, Q signal according to general communication QPSK signal parameters.
Further, step (3) particular content is：When carrying out algorithm simulating, each channel signal is discrete shape
Formula, it is f in sample ratesWhen, the delay inequality τ of each passageK~1It can be exchanged into delay sampling number
Wherein,Can be that integer is alternatively decimal.
The present invention realizes that decimal or integer sampled point prolong to signal using the group delay property of linear-phase filter
When.
Setting signal x (n) passes through the wave filter that is responded with frequencies below：
Wherein, n0Can not be integer for the group delay of wave filter.
Setting filter input signal is x (n), and output signal is y (n), using the time shift characteristic of Fourier transformation, is obtained
Frequency domain exports：
Time domain exports：
Y (n)=x (n-n0)
Wave filter is filtered input signal in passband so that input signal generates n0Delay.Therefore set
PutObtaining group delay isWave filter, according to the delay inequality τ of different passages and passage 1K~1Obtain different passages
Flora of filters delay, baseband modulation signal corresponding to each passage is filtered processing by the wave filter, you can obtains difference
Signal after channel time delay.In addition, another delay process method of the invention is, it is known that after filter freguency response,
Filtering is replaced by way of frequency domain multiplication, also can obtain the signal after delay process.
After being delayed to signal, because entering line delay, carrier phase variable quantity and delay inequality τ in radiofrequency signalK~1It is directly proportional, therefore
Carrier phase need to be compensated, directly be multiplied by signalObtain after carrying out delay inequality loading and carrier phase compensation
Analog signal Sbase(t)。
Further, the particular content of the step (4) is：Up-conversion model is obtained by delay inequality according to step (3)
Analog signal S after loading and carrier phase compensationbase(t) upconversion process, the analog signal S are carried outbase(t) it is：
The analog signal Sbase(t) it is multiplied byObtain carrying out the RF signal S after upconversion processRF(t),
SRF(t)=real { Sbase(t)}·cos(2πfct)-imag{Sbase(t)}·sin(2πfct)
Wherein, real refers to obtain analog signal Sbase(t) value of real part, imag refer to obtain analog signal Sbase(t)
Imaginary values.
Further, the RF signal S that the step (5) will obtain after step (4) processingRF(t) launched.
Another embodiment of the invention is, it is 3 to set linear array antenna element number of array, array element 1 and array element 2 it
Between baseline length be set to 0.15m, the baseline length between array element 2 and array element 3 is set to 0.21m, and arrival bearing θ is 30 °, radar
Signal parameter and QPSK signal parameters are consistent with being set in step (2).As shown in fig. 6, it is each communication channel delay emulation of radar signal
Figure.As shown in fig. 7, it is each communication channel delay analogous diagram of QPSK signals.The signal of passage 2 and passage 3 is can be seen that from Fig. 6 and Fig. 7
Signal than passage 1 is advanced, and each array element of direction finding receiving unit simulated has different time delayed signals, for positioning direction-finding system
Simulating, verifying.
The present invention can simulate the direction-finding signal under linear array, and the scope of direction-finding signal angle of arrival is [0 °, 360 °], can
Simulate the direction-finding signal of any direction.Direction-finding signal needed for being provided for direction-finding system, simulating, verifying is carried out for direction-finding system,
Avoid carrying out outfield experiments, it is effectively convenient to carry out direction finding checking, experimental period is shortened, and saved development cost.This hair
The signal imitation method of bright offer does not limit signal type, applied widely, and adaptive simulation is provided for positioning direction-finding system
Signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (9)
1. a kind of multichannel receiver signal imitation method under linear array, it is characterised in that：Comprise the following steps：
(1) linear array signal model is established, sets target transmission signal is s (t)：
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Wherein, u (t) is baseband modulation signal, fcFor signal center frequency；
(2) each channel receiving signal delay inequality extraction of linear array antenna, while generate baseband modulation signal, then passage k is with leading to
Delay inequality between road 1 is：
τK~1=-dK~1/ c=- (l1+...+lK~1)·sin(θ)/c；
Wherein, c refers to the light velocity, l1Refer to the baseline length between array element 2 and array element 1, lk-1Refer to the baseline between array element k and array element k-1
Length, dK~1Refer to the distance between passage k and passage 1, θ refers to transmission signal arrival bearing；
(3) each array element delay inequality loading of linear array antenna, signal after each array element delay inequality loading is obtained
(4) up-conversion is to radiofrequency signal, and output signal carries out up-conversion after being loaded to each array element delay inequalityProcessing；
(5) radiofrequency signal of launching simulation, the radiofrequency signal that the antenna receiving unit of receiving platform receives is r (t)：
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Wherein, τK~1For the delay inequality between passage k and passage 1,For the phase compensation parameter of carrier frequency.
2. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
Baseband modulation signal u (t) is stated to be produced by baseband modulation signal model.
3. multichannel receiver signal imitation method under a kind of linear array according to claim 2, it is characterised in that：Institute
It is radar signal or general communication signal to state baseband modulation signal u (t) types.
4. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
State delay inequality τK~1It is calculated by linear array antenna model.
5. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
State step (3) to be completed by Delay model, the delay inequality τ that step (2) is calculatedK~1It is loaded onto the baseband modulation of corresponding array element
On signal u (t).
6. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
Step (4) is stated to be completed by up-conversion model.
7. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
Linear array antenna element number of array is stated as 3.
8. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
State delay inequality τ in step (2)K~1Computational methods specifically include：
The first step, it is θ that user, which sets the arrival bearing of objective emission signal, and linear array antenna element number of array is for N and respectively
Baseline length between array element is l；
Second step, according to user's arrange parameter, calculate the delay inequality τ between array element k and array element 1K~1。
9. multichannel receiver signal imitation method under a kind of linear array according to claim 1, it is characterised in that：Institute
Step (3) is stated to specifically include：
The first step, delay inequality loading is carried out to signal using group delay；
Y (n)=x (n-n0)；
Wherein, x (n-n0) it is filter input signal, n0It is delayed for flora of filters；
Second step, the baseband modulation signal after being loaded to delay inequality carry out carrier phase compensation.
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