CN104601505A - Phase and frequency deviation preventing technique in radar/communication integrated comprehensive electronic system - Google Patents
Phase and frequency deviation preventing technique in radar/communication integrated comprehensive electronic system Download PDFInfo
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- CN104601505A CN104601505A CN201510000559.9A CN201510000559A CN104601505A CN 104601505 A CN104601505 A CN 104601505A CN 201510000559 A CN201510000559 A CN 201510000559A CN 104601505 A CN104601505 A CN 104601505A
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Abstract
The invention relates to the field of wireless communication in a radar/communication integrated comprehensive electronic system, particularly to a technique applying a continuous time-domain feedback multiplicative method combined with a single-carrier modulation, spread-spectrum modulation and multi-carrier frequency division multiplexing system, to the radar/communication integrated system. The technique is characterized in that the single-carrier modulation, spread-spectrum modulation and multi-carrier frequency division multiplexing system is utilized to meet the requirements on communication transmission speed, and the continuous time-domain feedback multiplicative method is utilized to effectively prevent the influence of phase and frequency deviation during large-range rapid time varying. The technique applying a continuous time-domain feedback multiplicative method combined with a single-carrier modulation, spread-spectrum modulation and multi-carrier frequency division multiplexing system to the radar/communication integrated system achieves radar communication through different combination schemes according to the capacity of SNR (signal to noise ratio), thereby effectively preventing influence of the phase and frequency deviation, meeting the requirements of the continuous time-domain feedback multiplicative method on high SNR loss and system communication transmission speed.
Description
Technical field
The present invention relates to the wireless communication technology field in radar/communicating integral Integrated Electronic System, specifically a kind ofly continued time domain is fed back producting method respectively in conjunction with the technology being applied to radar/communication integrated system after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system.
Background technology
Although radar system and communication system are separate because of the difference of its research object and function, radar carrys out the information such as extracting position, speed by the reflection echo signal receiving non-cooperation object; In a communications system, cooperation object is by cooperating with each other to realize effective information transmission.But the two has a lot of similarity in operation principle, use frequency range, system realization etc., all relates to electromagnetic transmitting and receiving, and is all furnished with transmitter, receiving equipment, signal processor etc.Therefore, radar system be combined with communication system, carry out integrated design, do not affecting on the basis of radar function, by the process to signal of communication, the wireless data transmission realizing radar mode is feasible.
Only consider its own signal stationary problem in radar system, there is no to consider the mutually synchronization problem with other system, but what communication equipment needed most is mutual stationary problem.Based in the communication system of radar, carrier synchronization problem is one of mutually synchronization problem needing to solve.According to the operation principle of radar system, radar is always attempted to receive the pulse echo signal oneself launched, so do not need special carrier wave mutually synchronization circuit, because be all identical as the radar transmitter of same equipment and the frequency source of receiver.And in radar/communication binary system, the oscillator that transceiver produces carrier wave works alone, certainly exist phase place and the frequency departure of intercarrier, this will make the radar receiver signal obtained of sampling there is serious distortion, affect input and reception, even cannot proper communication transmission.In addition when radar/communication integrated system is in high-speed mobile environment, the phase place between radar mode communicating pair and frequency departure can strengthen further, and the performance of system is reduced greatly, very can not proper communication.Therefore, while guarantee radar/communication integrated system realizes efficient communication, how effectively to resist phase place and frequency departure problem, be the major issue needing research badly.
Therefore, designing a kind of technology effectively resisting phase place and frequency departure is the effective ways solving reliable data communication in real time in radar type communication process.Adopt continued time domain feedback product effectively can resist phase place and frequency departure problem, the method on a large scale fast time the frequency shift (FS) that becomes there is stronger stability, frequency difference because relative motion causes and difference are all cancelled when continuous feedback product, thus eliminate the adverse effect of frequency difference and difference, realize the real-time reliable data transmission in radar/communication integrated system.
Summary of the invention
The object of the invention is to utilize and continued time domain is fed back producting method respectively in conjunction with the technology being applied to radar/communication integrated system after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system, effectively can not only resist the phase place in radar/communication integrated system and frequency departure, realize radar type communication reliably in real time, and the valid data transmission of given pace under high-speed mobile environment can be ensured.
The present invention can be reached by following measures:
Continued time domain is fed back producting method respectively in conjunction with the technology being applied to radar/communication integrated system after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system, it is characterized in that carrying out continued time domain feedback product to single-carrier modulated signal, spread-spectrum signal, ofdm signal respectively, the phase place in radar type communication process and frequency departure are cancelled in signal time domain feedback product procedure.Under different state of signal-to-noise, the present invention can resist phase place in radar/communication integrated system and frequency departure effectively, and can realize the real time communication of certain message transmission rate.
Of the present inventionly continued time domain is fed back producting method respectively in conjunction with the technology being applied to radar/communication integrated system after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system, be specially: the method adopting secondary time domain feedback product, combine the phase place of three continuous print digital signals come the phase place and frequency departure introduced in erasure signal source or transmitting procedure.Single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system, the speed that they can realize transfer of data is different, also different with frequency departure susceptibility to phase place.Three systems, respectively in conjunction with after continued time domain feedback producting method, are applied in radar/communication integrated system, had both remained three kinds of original advantages of system, effectively be counteracted that again phase place and frequency departure problem in radar/communication integrated system.
The present invention compared with prior art, do not need to arrange corresponding frequency estimation algorithm and frequency compensation algorithm at receiving terminal, but adopt the measure of obviate to resist phase place between radar mode communicating pair and frequency departure, and then ensure that the reliable and work of real-time of radar/communication integrated system.
accompanying drawing illustrates:
Accompanying drawing 1 is in the present invention, continued time domain is fed back producting method in conjunction with the theory diagram be applied to after single carrier modulation system in radar/communication integrated system
Accompanying drawing 2 is in the present invention, continued time domain is fed back producting method in conjunction with the theory diagram be applied to after spread spectrum system in radar/communication integrated system
Accompanying drawing 3 is in the present invention, continued time domain is fed back producting method in conjunction with the theory diagram be applied to after multicarrier Frequency Division Multiplexing system in radar/communication integrated system
Accompanying drawing 4 is continued time domain feedback product modulated theory diagram
Accompanying drawing 5 is continued time domain feedback product demodulation theory diagram
Accompanying drawing 6 realizes schematic diagram for continued time domain feeds back product modulated correction block-scheme method
Accompanying drawing 7 realizes schematic diagram for continued time domain feeds back product demodulation correction block-scheme method
Accompanying drawing 8 realizes schematic diagram for continued time domain feeds back product modulated phase method
Accompanying drawing 9 realizes schematic diagram for continued time domain feeds back product demodulation phase method
embodiment:
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Main contributions of the present invention is by continued time domain being fed back producting method respectively in conjunction with the phase place be applied to after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system in the technical antagonism radar/communication integrated system of radar/communication integrated system and frequency departure problem.Not only effectively resist phase place and frequency departure in conjunction with continued time domain feedback producting method, and ensure that the systematic function of complete real-time working.
As shown in Figure 1, described in the present invention, continued time domain is fed back producting method to be realized by following steps in conjunction with being applied to after single carrier modulation system in radar/communication integrated system:
Step 1: the constellation mapping of the binary baseband signal of input being carried out to base-band digital modulation
Step 2: carry out the modulation of continued time domain feedback product phase method to signal, namely the precautionary measures of the anti-phase place of transmitting terminal and frequency departure, carry out intermediate frequency Modulation afterwards
Step 3: complete radar/communicating integral, rf modulations is launched
Step 4: the integration signal modulated is delivered in wireless channel and transmit (signal may be subject to the impact of phase place and frequency departure and white Gaussian noise)
Step 5: receiving terminal receives integration signal, radio demodulating, then carries out integrated treatment
Step 6: carry out intermediate frequency demodulation to signal of communication, and the demodulation of continued time domain feedback product phase method, remove the impact of phase place and frequency departure
Step 7: inverse mapping phase method restituted signal being carried out to base-band digital modulation, recovers original transmitted signal.
As shown in Figure 2, described in the present invention, continued time domain is fed back producting method to be realized by following steps in conjunction with being applied to after spread spectrum system in radar/communication integrated system:
Step 1: utilize the binary baseband signal of spreading code to input to carry out spread spectrum
Step 2: the constellation mapping of spread-spectrum signal being carried out to base-band digital modulation
Step 3: carry out the modulation of continued time domain feedback product phase method to signal of communication, namely the precautionary measures of the anti-phase place of transmitting terminal and frequency departure, carry out intermediate frequency Modulation afterwards
Step 4: complete radar/communicating integral, rf modulations is launched
Step 5: the integration signal modulated is delivered in wireless channel and transmit (signal may be subject to the impact of phase place and frequency departure and white Gaussian noise)
Step 6: receiving terminal receives integration signal, radio demodulating, then carries out integrated treatment
Step 7: carry out intermediate frequency demodulation to signal of communication, and the demodulation of continued time domain feedback product phase method, remove the impact of phase place and frequency departure
Step 8: utilize the spreading code corresponding with transmitting terminal to carry out despreading to phase method restituted signal
Step 9: inverse mapping despread signal being carried out to base-band digital modulation, recovers original transmitted signal.
As shown in Figure 3, described in the present invention, continued time domain is fed back producting method to be realized by following steps in conjunction with being applied in radar/communication integrated system after multicarrier Frequency Division Multiplexing system:
Step 1: the constellation mapping of the binary baseband signal of input being carried out to base-band digital modulation
Data parallel is multichannel by step 2: serial/parallel conversion
Step 3: IFFT conversion is carried out to data, then carry out parallel/serial conversion
Step 4: add Cyclic Prefix, protection coefficient interval time can get the derivative parameter such as 1/4,1/8,1/16
Step 5: carry out the modulation of continued time domain feedback product phase method to signal, namely the precautionary measures of the anti-phase place of transmitting terminal and frequency departure, carry out intermediate frequency Modulation afterwards
Step 6: complete radar/communicating integral, rf modulations is launched
Step 7: the integration signal modulated is delivered in wireless channel and transmit (signal may be subject to the impact of phase place and frequency departure and white Gaussian noise)
Step 8: receiving terminal receives integration signal, radio demodulating, then carries out integrated treatment
Step 9: carry out intermediate frequency demodulation to signal of communication, and the demodulation of continued time domain feedback product phase method, remove the impact of phase place and frequency departure
Step 10: take out Cyclic Prefix, serial/parallel conversion, carries out FFT conversion to multiple signals
Step 11: parallel/serial conversion, carries out the inverse mapping of base-band digital modulation, recovers original transmitted signal to signal.
the principle of continued time domain feedback producting method.
Continued time domain feeds back the modulation block diagram of product as shown in Figure 4:
z n for initialize signal,
v n for modulating rear signal, lower relational expression can be able to by schematic diagram:
P n =
P n-1 Z n (1)
V n=
V n-1 P n
Then:
z n=
v n v n-2/
v 2 n-1=(
v n/
v n-1) × (
v n-2/
v n-1), order
φ n=arg (
v n)-arg (
v n-1),
θ nfor initialize signal phase place,
θ n=arg (
z n) can obtain:
θ n=?
φ n－?
φ n-1=?
2 φ n(2)
If the signal after the continued time domain feedback product modulated that receiving terminal receives is
v n(
t)=
e j(
wt+
φn)
,
ωfor carrier frequency, then
θ n=
φ n－2
φ n-1＋
φ n-2(3)
Continued time domain feeds back the demodulation block diagram of product as shown in Figure 5:
When
nwhen>=0, consider the Gauss's single-input single-output channel having phase place and frequency departure.If the signal received is:
x(
t)= √
Ee j (
wdt+
ψ)
V n (
t)＋
e n(
t) (4)
Wherein:
efor the signal energy received;
ω d for the frequency difference between transmitting terminal and receiving terminal; ψ is difference;
e n for the noise in channel, it is white Gaussian noise.
Relational expression is there is by accompanying drawing 5 is known
x n(
t)=
x n (
t)
x * n-1(
t), formula (4) is substituted into and can obtain:
X n(
t)=
Ee j [(w+
wd)
T+?
φn]
+ √
E e - j (
wd(
t-
T)+
ψ)
V * n-1(
t)
e n(
t)
+√
E e j (
wdt+
ψ)
V n (
t)
e * n-1(
t)+
e n(
t)
e * n-1(
t) (5)
=
Ee j [(w+
wd)
T+?
φn]
+
θ n (
t)
Wherein:
θ n(
t) be
x n(
t) middle overall noise, be white Gaussian noise.Known by above formula,
x n(
t) and the time
tirrelevant, with differ ψ irrelevant, with frequency difference
ω d relevant.Therefore difference can be eliminated through once feeding back time domain product.
Also relational expression is there is by accompanying drawing 5 is known
d n=
x n x * n-1, formula (5) is substituted into and can obtain:
d n=
E 2 e j (?2
φn)
+
Ee j [(w+
wd)
T+?
φn-1]
θ n +
Ee j [(w+
wd)
T+?
φn]
θ * n-1+
θ n θ * n-1
=
E 2 e j (?2
φn)
+
N n(6)。
Because
2 φ n=
φ n-
φ n-1=
θ n, thus
z nphase place
θ nout demodulated, eliminate the impact of frequency difference.Visible after continuous feedback time domain product demodulation, the phase place between radar mode communicating pair and frequency departure all can be cancelled completely, thus correctly can recover the phase place of primary signal.
continued time domain feedback producting method noise robustness feature.
The noise robustness of the modulation and demodulation of continued time domain feedback product is analyzed.For BPSK coded system, the error-rate expression of BPSK system is
p e1 =0.5erfc (√
r 1), time domain feedback product in conjunction with the error-rate expression of BPSK system and DBPSK is
p e2 =0.5
e -r2
.From realizing schematic diagram, continued time domain feedback product essence is the cascade of twice time domain feedback product, thus can think that continued time domain feedback product is for feature with the error performance of DBPSK in conjunction with the error performance of BPSK system and DDBPSK.In order to simplify the calculating of the DDBPSK error rate, suppose
x n,
x n-1gaussian distributed.Again because higher-order noise component is very little for dominant noise item, thus suppose higher-order noise component Gaussian distributed.And in analysis, consider second-order noise component and suppose its also Gaussian distributed, can obtain further
x nsignal to noise ratio be r=r
3/ (2+ r
3 -1).The last error rate analogizing DDBPSK again with DBPSK, substitutes into the error-rate expression of DBPSK by r expression formula
p e2 =0.5
e -r in can obtain the error-rate expression of DDBPSK
p e3 =0.5
e -r3/ (2+1/ r3)
.
The above analysis, can obtain the BPSK error rate
p e1 =0.5erfc (√
r 1), the DBPSK error rate
p e2 =0.5
e -r2
, the error rate of DDBPSK
p e3 =0.5
e -r3/ (2+1/ r3)
.Under same bit error rate performance, analyze the corresponding relation consuming signal to noise ratio between three, order
p e1 =
p e2 =
p e3 .When
p e3 =
p e2 in time, substitutes into above-mentioned error-rate expression and can obtain: 0.5
e -r3/ (2+1/ r3)
=0.5
e -r2
, namely
-r 3/(2+1/ r
3)= r
2→r
3 2－2r
2r
3－r
2=0
Because ,=4r
2 2+ 4r
2>0, r
2>0, r
3>0 (7)
So, r
3=(2r
2+ √ (4r
2 2+ 4r
2))/2=r
2+ √ (r
2 2+ r
2)>=r
2+ √ r
2 2>=2r
2.
Change above-mentioned signal to noise ratio into dB form can obtain, reaching under same bit error rate performance, the signal to noise ratio r that DDBPSK consumes
3than the signal to noise ratio r that DBPSK consumes
2many about 3dB.In like manner, make
p e1 =
p e2 , the signal to noise ratio r that DBPSK consumes can be drawn
2than the signal to noise ratio r that BPSK consumes
1many about 3dB.Thus the signal to noise ratio r of DDBPSK consumption
3than the signal to noise ratio r that BPSK consumes
1many about 6 dB.
the realization of continued time domain feedback producting method.
By analyzing, the implementation method of the modulation and demodulation of continued time domain feedback product has multiple, as follows respectively: (1) coded system.According to the principle of continued time domain feedback product modulated, find out rule of conversion between corresponding code element, then coding mapping is carried out to signal.Along with the exponent number of base-band digital modulation increases, rule of conversion corresponding to this kind of mode can become very complicated, and the complexity of realization also can correspondingly increase.Therefore this kind of mode does not have applicability.(2) block diagram form is revised, shown in following block diagram 6,7.This kind of mode can relate to multiplying many times.This not only adds hard-wired complexity, and when the amplitude of code element is very little, then after the continuous time delay and multiplication operation of continued time domain feedback product, its amplitude can be more and more less, so that be tending towards 0, thus cause subsequent symbol compile error.Thus this kind of mode is also inapplicable.(3) phase method realizes.By volume, continued time domain feedback product eliminates the impact of phase place and frequency departure mainly through the phase relation between continuous three code elements, therefore it can realize according to the relation of phase place.This kind of mode had both avoided complicated coded system, also eliminated a large amount of companies and took advantage of the adverse effect operating and bring.What the present invention adopted is exactly the mode that this kind of phase method realizes.Concrete realize principle and process is as follows.
Can be found by the modulation block diagram of continued time domain feedback product, the phase relation of modulation signal and initialize signal is shown below:
φ n=
θ n＋2
φ n-1－
φ n-2(8)
Wherein:
φ nfor modulating signal phase,
θ nfor initialize signal phase place.
Can be found by the demodulation block diagram of continued time domain feedback product, the relationship analysis that can be obtained between phase place by the relation between signal is as follows.
Due to
x n=
x n x * n-1, the two phase relation can be obtained and be shown below:
φ X=
φ x －
φ x-2
(9)
Wherein,
φ xfor signal
x n phase place,
φ x for signal
x nphase place.
Again
d n=
x n x * n-1, then phase relation is shown below:
φ d=
φ X－
φ X-1(10)
The relation between restituted signal and input signal can be obtained thus, be shown below:
φ d=
φ X－
φ X-1=
φ x －2
φ x-1
+
φ x-2
(11)。
Adopt phase method can realize the modulation and demodulation of continued time domain feedback product, specific implementation theory diagram as Figure 8,9.In addition from its principle, the key of this kind of implementation extracts phase place.In order to the phase place of signal accurately can be taken out, present invention employs cordic algorithm.Specific implementation process: first amplitude normalization process is carried out to signal, then adopt cordic algorithm to extract signal phase, determine the phase place of modulation signal during modulation by formula (8), afterwards signal amplitude is recovered; During demodulation, amplitude normalization process is carried out to signal, then adopt cordic algorithm to extract signal phase equally, and determine the phase place of restituted signal by formula (11), finally amplitude is recovered.
Claims (2)
1. according to formula (8), (11) and accompanying drawing 4 ~ 9 mode build electronic system, continued time domain is fed back producting method respectively in conjunction with single carrier modulation system, the technology of radar/communication integrated system is applied to after spread spectrum system and multicarrier Frequency Division Multiplexing system, it is characterized in that utilizing continued time domain feedback producting method to solve the problem of phase place and frequency departure in radar/communication integrated system, not only ensure that single carrier modulation system respectively, the respective advantage of spread spectrum system and multicarrier Frequency Division Multiplexing system, and by the size according to channel SNRs, different association schemes are selected to carry out radar type communication, radar/communication integrated system is made to there is the RFDC that still can realize certain transmission rate in phase place and frequency departure situation.
2. according to claim 1 continued time domain is fed back producting method respectively in conjunction be applied to after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system radar type communication technology, it is characterized in that according to we propose technology can realize in the following manner:
Mode 1: based on FPGA platform, the download codes implement formed after using the hardware description languages such as Verilog HDL, VHDL and compiling thereof
Mode 2: based on microprocessor platform, the executable file formed after using the software program such as assembler language, C language and compiling thereof realizes
Mode 3: realize based on the special large scale digital logical circuit of structure
Continued time domain is fed back producting method and achieve by means of above-mentioned three kinds of mode platforms the application that continued time domain feeds back producting method in conjunction with the technology being applied to radar/communication integrated system after single carrier modulation system, spread spectrum system and multicarrier Frequency Division Multiplexing system respectively, continued time domain is utilized to feed back product thought, phase place in the communication of antagonism radar mode and frequency departure, realize the RFDC of radar mode.
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| CN108600138A (en) * | 2018-04-25 | 2018-09-28 | 重庆大学 | Radar-communication integration receiver carrier synchronization method |
| CN114488060A (en) * | 2022-01-10 | 2022-05-13 | 武汉大学 | Method for resolving phase difference of meteor echo signals between wind measuring radar receivers |
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