CN101425857A - Diagnosis method for non-linear interference outside communication band of transmission device - Google Patents
Diagnosis method for non-linear interference outside communication band of transmission device Download PDFInfo
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- CN101425857A CN101425857A CNA2008102270743A CN200810227074A CN101425857A CN 101425857 A CN101425857 A CN 101425857A CN A2008102270743 A CNA2008102270743 A CN A2008102270743A CN 200810227074 A CN200810227074 A CN 200810227074A CN 101425857 A CN101425857 A CN 101425857A
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Abstract
The invention discloses a diagnosis method for out-of-band nonlinear interference of communication frequency of a transmitting device, comprising the following steps: (1) a behavioral-level simulation model of a radio-frequency head of the transmitting device is established; (2) simulation calculation is performed on the behavioral-level simulation model in the step one to obtain the out-of-band output frequency spectrum at the radio-frequency head of the transmitting device; (3) the energy transferring relationship between an interfering transmitting device and an interfered receiving device is established, and is expressed by dB as: Pri(f)=Pti(f)-Ltl(f)+Gt(f)-La(f)+Gr(f)-Lrl(f); and Pri(f) is calculated; and (4) the interference from the transmitting device to a receiving device is diagnosed according to the Pri(f) obtained in the step (3) and an interference judgment condition Pri(f)+Sm is more than or equal to Ps'(f). The method can flexibly process various nonlinear parameters of different sub-circuit modules, fast calculate the out-of-band output frequency spectrum of the radio-frequency head of the transmitting device, diagnose the interference from the transmitting device to the receiving device according to energy transferring relationship between the transmitting device to the receiving device and an interference condition, provide powerful tools for the electromagnetic interference diagnosis of a plurality of communication systems on a same platform, and provide a guideline for a communication device to adopt an effective electromagnetic compatibility measure.
Description
Technical field
The invention belongs to the electromagnetic compatibility technology field, relate to a kind of diagnostic method that comprises the outer non-linear interference of transmitter communication band on the platform that overlaps communication systems more, specifically, be meant the diagnostic method of the outer non-linear interference of a kind of transmitter communication band.
Background technology
The airborne communication platform comprises many cover transmitting and receiving apparatus, and powerful transmitter and highly sensitive receiver all are installed in the limited space, and electromagnetic signal is intensive.And the aircraft material uses composite material mostly, makes may form serious phase mutual interference between the communication equipment in this local space zone, causes the communication device works decreased performance.In order to realize maximum communication distance, need the transmitting power of transmitter very big, consider the power consumption of airborne equipment simultaneously, in order to guarantee the efficient of output power of transmitter, the transmitter intermediate power amplifier also can be operated near inelastic region or even the saturation region, can bring unnecessary harmonic wave, intermodulation product.Transmitter adopts the superhet structure, and its technological deficiency is to have produced unnecessary spurious response in the process of mixing.Therefore, very important by the non-linear communication band external radiation interference problem of bringing, high order harmonic component that transmitter produces and intermodulation product are received by other high-sensitive receiver easily, influence the normal reception of useful signal.
The main cause that causes the radiated interference that the transmitter communication band is outer is frequency mixer and the amplifier nonlinearity characteristic in the transmitter.General powerful power amplifier is operated in the inelastic region, other amplifier also can have the small nonlinearity characteristic, frequency mixer itself is exactly to utilize nonlinear characteristic to realize moving of frequency spectrum, and nonlinear amplifier and frequency mixer have strengthened the radiation of transmitter out of band spectrum.The non-linear index of nonlinear amplifier adopts gain compression and intermodulation distortion to describe usually, and the non-linear index of frequency mixer is described with frequency conversion compression and intermodulation distortion.
The nonlinear characteristic of nonlinear amplifier and frequency mixer can a shared graphical representation, as Fig. 1, abscissa is represented input power Pin, ordinate is represented power output Pout, if Fig. 1 represents the nonlinear characteristic of nonlinear amplifier, the point that value on the relation curve ordinate of then actual Pout and Pin is lower than the relation curve 1dB of desirable Pout and Pin is designated as the 1dB compression point, as Fig. 1 mid point B, then P
1dBBe the power output numerical value of the compression point correspondence of power gain 1dB, the 1dB compression point is used for weighing the power capacity of amplifier, and the expression Amplifier Gain departs from constant.If Fig. 1 represents frequency mixer nonlinear characteristic, P
1dBThe corresponding power output of specified point when beginning the departs from linear feature with the functional relation of radio-frequency input signals corresponding to intermediate-freuqncy signal.The parameter of describing intermodulation distortion in the nonlinear device generally is three rank point of cut-offs and second order point of cut-off, described three rank point of cut-offs are intersection points of the relation curve of triple-frequency harmonics curve and desirable pout and pin, be designated as intersection point A, as Fig. 1, the power output of described three rank point of cut-off correspondences is a power P
OIP3, corresponding input power is a power P
IIP3, the outer intermodulation distortion signals of communication band is the reconfiguring of several frequencies in the nonlinear circuit, combination frequency can be expressed as mf
1+ nf
2+ lf
3+ ..., wherein, m=0,1,2 ..., n=0,1,2 ..., l=0,1,2 ... be coefficient; f
1, f
2, f
3It is respectively the frequency of the signal that exists in the circuit.Work as m+n+l+ ...=M, then the signal on the M rank of Huo Deing particularly ought only have m, n, l ... value 2,3,4 ... the time, then the signal of Huo Deing is followed successively by secondary, three times or high order harmonic component more.Many harmonic signal, inter-modulated signal can appear behind outer intermodulation distortion signals process frequency mixer of described communication band and the amplifier, particularly in optical mixing process, the required local oscillation signal power of frequency mixer work is usually than more than the big 10dB of handled signal power, and local oscillation signal may have the effect that energy heavily injects to the outer interference signal of the band that produces.
After electronic equipment satisfies the electromagnetic compatibility index of national Specification, can be considered as up to standard, but the mode of this cutting national standard is not necessarily effective, qualified a plurality of electronic equipments also emc issue can occur after cascade is integrated.The transmitter index is qualified, puts it on the platform of many covers communication system of a complexity still emc issue may occur, is easy to especially ignore for the outer non-linear radiated interference that causes of transmitter communication band.Go to the performance index of considering in the communication band toward all being in transmitter design phase or equipment typing, as long as it is just passable that the national Specification value is satisfied in the inhibition outside the communication band, but because other receiving equipment that the non-linear transmitter that causes is adjusted the distance very near outside communication band may produce very strong interference.Usually, all be after transmitter communication band external signal interference phenomenon fully is exposed to, just come the location interference source by a large amount of means of testing, do like this and not only expend a large amount of manpowers and material resources, and a large amount of test meetings impacted life-span of equipment.Therefore, need consider electromagnetic compatibility problem, the non-linear radiated interference situation that causes of diagnosis transmitter outside communication band in the transmitter design phase.
Summary of the invention
The present invention is in order to carry out the disturbed condition location before the exposure of interference phenomenon outside the transmitter communication band, thereby make transmitter just fully solve electromagnetic interference problem in the design phase, the diagnostic method of the outer non-linear interference of a kind of transmitter communication band is provided, specifically, be a kind of on the platform that comprises many cover communication systems, at first adopt circuit stages emulation, set up the behavioral scaling simulation model of transmitter radio-frequency head, and to the behavior grade simulated model carry out emulation and obtain being with outer output spectrum, set up the power transfer relation then, transmit at antenna emission back electromagnetic wave propagation in conjunction with the electromagnetic field computed in software, analyze interference signal in the power transfer situation that arrives disturbed equipment, the final diagnosis transmitter is to the interference of other communication system equipment.
The diagnostic method of the outer non-linear interference of transmitter communication band of the present invention may further comprise the steps:
Step 1: adopt circuit stages emulation, set up the behavioral scaling simulation model of transmitter radio-frequency head.Simulation model comprises the functional characteristic of each electronic circuit module of description transmitter radio-frequency head and the behavior model of nonlinear characteristic;
In the described behavioral scaling simulation model, each electronic circuit module, the all corresponding behavior model of modulation module, filter A, filter B, filter C, frequency mixer A, frequency mixer B, amplifier A, amplifier B, power amplifier, what each behavior model was described is the input/output function characteristic of electronic circuit module, and the functional parameter of modulation module includes modulation system, modulation index, carrier signal and frequency modulating signal; The functional parameter of filter A, B, C includes the filtering type, ripple in frequency, pass band, band; The functional parameter of amplifier A, amplifier B, power amplifier includes gain, port reflection coefficient, and the functional parameter of frequency mixer A, frequency mixer B includes conversion gain, image frequency inhibition, local oscillator leakage; In amplifier A, amplifier B, power amplifier and frequency mixer A, frequency mixer B, also comprise 1dB compression point power output and three rank these nonlinear parameters of point of cut-off power output.
Step 2: the behavioral scaling simulation model in the step 1 is carried out simulation calculation, draw the outer output spectrum of band of transmitter radio-frequency head.
Instantaneous simulator and harmonic balance simulator are adopted in described emulation, instantaneous simulator can carry out instantaneous time domain analysis, the harmonic balance simulator can carry out the frequency-domain analysis of nonlinear circuit, permission is carried out multi-frequency emulation to circuit, the spectrum component of curtage be can determine, harmonic distortion and intermodulation distortion component calculated.Output spectrum is that abscissa is a frequency after the emulation, and ordinate is the spectrogram of power.
Step 3: set up the power transfer relation of disturbing between transmitter and the disturbed receiving equipment, and calculate on the inherent a certain frequency of frequency acceptance band from disturbing transmitter to be coupled to the power P of disturbed receiving equipment
Ri(f).
P
ri(f)＝P
ti(f)L
tl(f)G
t(f)L
a(f)G
r(f)L
rl(f)
Represent that with dB following formula is: P
Ri(f)=P
Ti(f)-L
Tl(f)+G
t(f)-L
a(f)+G
r(f)-L
Rl(f)
In the formula:
F---can fall into the operating frequency in the receiving equipment passband.
P
Ri(f)---for be coupled to the power of disturbed receiving equipment on the inherent a certain frequency of frequency acceptance band from the interference transmitter;
P
Ti(f)---the outer output signal power of band of transmitter radio-frequency head;
G
t(f)---the transmitting antenna power gain;
L
a(f)---space attenuation;
G
r(f)---the reception antenna power gain;
L
Tl(f)---the emission transmission line loss;
L
Rl(f)---receive transmission line loss.
Step 4: according to the P that obtains in the step 3
Ri(f) and disturbed Rule of judgment P
Ri(f)+S
m〉=P
S '(f), the diagnosis transmitter is to the interference of receiving equipment.
If P
Ri(f)+S
m〉=P
S '(f), illustrate that then the transmitter communication band is the receiving equipment generation interference of f to receive frequency outward; Otherwise think be not the receiving equipment generation interference of f to receive frequency.
P
S '(f)---be the susceptibility of receiving equipment.
S
m---the margin of safety (margin of safety that national standard requires is 6dB) of receiver.
Among the present invention when diagnosing transmitter emission band external signal to the interference of receiving equipment, ignore the diffraction decay between dual-mode antenna, coupling is blocked and the polarization mismatch factor, main consideration is that the outer signal frequency of transmitter emission band falls into the passband of another communication system receiving equipment, thereby does not consider receiving equipment amount of suppression to received signal.
The outer output spectrum of described band is the outer frequency spectrum of communication band that a plurality of frequency mixers and amplifier nonlinearity cause;
The outer output spectrum of described band includes only spurious emissions, harmonic emissions is arranged, intermodulation product and frequency conversion product.
The invention has the advantages that:
(1) satisfies under the situation of standard gauge definite value in transmitter communication band external radiation signal strength signal intensity, calculate the outer non-linear radiated interference that causes of transmitter communication band, may disturb other receiving equipment that diagnostic method is provided transmitter.Transmitter may be to the interference of another communication system receiving equipment from the next communication system of system-level analysis concrete condition, remedies independent cutting national standard and assert the deficiency that transmitter is up to standard.
(2) method that adopts a road to combine, radio-frequency head output spectrum before the emission of transmitter antenna is adopted the analytical method of road level, the outer output spectrum of the band of simulation calculation transmission antennas transmit equipment radio frequency end, transmitting antenna adopts an analytical method of level to reception antenna, space attenuation when analyzing electromagnetic wave propagation can be finished the analyzing and diagnosing of interference source-coupling path-sensitive equipment.
(3) adopt the behavioral scaling simulation model to analyze the outer non-linear radiation that causes of transmitter radio-frequency head communication band, do not need detail knowledge emission system internal circuit level parameter, as long as, just can locate frequency and the power that may there be interference in transmitter fast according to the parameter of physical device handbook adjustment simulation model.
(4) the power transfer relation has versatility between reception and transmitter, utilization disturbs diagnostic formulation to judge the outer non-linear radiated interference that causes of frequency band of transmitter, overlaps the electromagnetic interfere diagnose of communication systems and takes effective electromagnetic compatibility measure that guide is provided on the identical platform more.
Description of drawings
Fig. 1 is the I/O transfer characteristic curve of nonlinear amplifier, frequency mixer;
Fig. 2 is the flow chart of the outer non-linear interference diagnostic method of transmitter communication band of the present invention;
Fig. 3 is the behavioral scaling simulation model principle schematic of transmitter radio-frequency head;
Fig. 4 is the schematic diagram of power transfer relation between transceiver;
Fig. 5 is the outer output spectrum of the band of transmitter radio-frequency head among the embodiment.
Among the figure: the 1-modulation module; 2-filter A; 3-frequency mixer A; 4-filter B; 5-amplifier A; 6-frequency mixer B; 7-filter C; 8-amplifier B; The 9-power amplifier.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
The present invention is the diagnostic method of the outer non-linear interference of a kind of transmitter communication band, method flow diagram as shown in Figure 2, concrete implementation step is as follows:
Described transmitter radio-frequency head specifically refers to not comprise antenna from producing modulation signal to this section of antenna.
Described behavioral scaling simulation model is that each electronic circuit module of transmitter radio-frequency head is regarded as flight data recorder, imports that the functional parameter of each electronic circuit module and nonlinear parameter set up.This kind behavioral scaling simulation model is applicable to Electromagnetic Compatibility of Power Electronics interference and anti-interference simulation analysis.After setting up model, the parameter that only need change each module in the model just can obtain the model of different performance, is that the corrective measure of proposition electromagnetic compatibility is all easily practical after design of electronic devices stage or equipment moulding.
Transmitter of the present invention is a second order superhet structure, and transmitter radio-frequency head structure comprises modulation module 1, filter A2, frequency mixer A3, filter B4, amplifier A5, frequency mixer B6, filter C7, amplifier B8, power amplifier 9 these electronic circuit modules.
1) according to transmitter radio-frequency head structure, set up the behavioral scaling simulation model of transmitter radio-frequency head, as Fig. 3, this model comprises modulation module 1, filter A2, frequency mixer A3, filter B4, amplifier A5, frequency mixer B6, filter C7, amplifier B8, power amplifier 9.1 pair of modulation signal of modulation module and carrier signal are modulated, enter filter A2 then and carry out first order filtering, the filtered signal of the first order in frequency mixer A3 with the first local oscillation signal mixing and form first intermediate-freuqncy signal, first intermediate-freuqncy signal enters filter B4 subsequently, amplifier A5 carries out filtering, amplify, its output signal becomes second intermediate-freuqncy signal in frequency mixer B6 with after the second local oscillation signal mixing then, second intermediate-freuqncy signal enters filter C7, amplifier B8 carries out filtering, amplify, its output signal is amplified the back through power amplifier 9 and is obtained output radio frequency (RF) signal.
2) value of the relevant parameter of behavioral scaling simulation model is set: wherein the functional parameter of modulation module 1 includes modulation system, modulation index, carrier signal and frequency modulating signal; The functional parameter of filter A2, B4, C7 includes the filtering type, ripple in frequency, pass band, band; The functional parameter of amplifier A5, amplifier B8, power amplifier 9 includes gain, port reflection coefficient, and the functional parameter of frequency mixer A3, frequency mixer B6 includes conversion gain, image frequency inhibition, local oscillator leakage; In amplifier A5, amplifier B8, power amplifier 9 and frequency mixer A3, frequency mixer B6,, 1dB compression point power output and three rank these nonlinear parameters of point of cut-off power output are set according to the technical manual of transmitting end equipment.
The present invention adopts the harmonic balance simulator and the instantaneous simulator of analyzing communication system nonlinear characteristic, and the behavioral scaling simulation model in the step 1 is carried out emulation.
1) emulation draws the outer output spectrum of band of transmitter radio-frequency head.Being with outer output spectrum is that abscissa is a frequency, and ordinate is the spectrogram of power.
2) the outer output spectrum figure of the band of analysis transmitter radio-frequency head.Select the outer frequency that may produce interference of transmitter communication band, that is to say, these frequencies that may produce interference can fall in the passband of other communication system, and because the power that the close together between communication system causes these to fall into the frequency in other communication system passband is enough strong.
Interference in the outer output spectrum of described band is mainly, through producing many secondary and above Harmonic Interference signal, second order, three rank and above Intermodulation Interference signal and frequency conversion product behind non-linear frequency mixing device and the power amplifier.The watt level of these harmonic waves, Intermodulation Interference signal and frequency conversion product all with simulation model in the nonlinear parameter that is provided with closely related.
The present invention has considered that transmitter a certain frequency f outside band delivers to the power P of antenna
Ti(f), the transmitter output port is to the emission transmission line loss L between the transmitting antenna input port
Tl(f), the transmitter antenna is in the transmitting power gain G of disturbed receiving equipment receive direction
tSpace attenuation L when (f), signal transmits between transmitter and the disturbed receiving equipment
a(f), disturbed antenna of receiving device is in the received power gain G of transmitter transmit direction
r(f) and the reception antenna output port to the reception transmission line loss L that receives between input port
Rl(f), as Fig. 4.In different communications platforms, diffraction between dual-mode antenna is decayed, coupling is blocked and polarization mismatch is widely different, the present invention ignores the diffraction decay between dual-mode antenna, coupling is blocked and the polarization mismatch factor, calculating the out-of-band radiated interference signal frequency of transmitter falls into the passband of another communication system receiving equipment and need not consider receiving equipment amount of suppression to received signal, make interference signal not be subjected to above-mentioned factor affecting and little in the decay in space, disturb worse situation thereby analyze, diagnose more potential interference frequency.Thereby set up the power transfer relation of disturbing transmitter and disturbed receiving equipment,
P
ri(f)＝P
ti(f)L
tl(f)G
t(f)L
a(f)G
r(f)L
rl(f) (1)
Represent that with dB following formula (1) is:
P
ri(f)＝P
ti(f)-L
tl(f)+G
t(f)-L
a(f)+G
r(f)-L
rl(f) (2)
In the formula: P
Ri(f) for be coupled to the power of disturbed receiving equipment on the inherent a certain frequency of frequency acceptance band from the interference transmitter;
Usually, emission transmission line loss L
Tl(f), receive transmission line loss L
Rl(f) technical manual or the test that can consult cable obtains the transmitting antenna power gain G
t(f), reception antenna power gain G
r(f) can obtain by electromagnetic field simulation software analysis or test.
When frequency f is got occurrence,, obtain on the inherent a certain frequency of frequency acceptance band from disturbing transmitter to be coupled to the power P of disturbed receiving equipment according to formula (2)
Ri(f).
Space attenuation L in above-mentioned formula (1), (2)
a(f) divide following two kinds of situations to calculate:
1. when reception antenna is positioned at the far-field region of transmitting antenna:
In the formula: D is the full-size of transmitting antenna, and r is the distance of transmitting antenna and reception antenna, and unit is m, and λ is the operation wavelength that transmits.
The space attenuation L of transmission signals between transmitter and the receiving equipment
a(f) (dB of unit) calculates according to following formula (4):
In the formula: f is an operating frequency, and unit is MHz, and v is the propagation velocity that transmits, and value is 3 * 10
8M/s becomes behind following formula (4) substitution π and the v:
L
a＝-27.56+20logf+20logr (5)
2. it is satisfied apart from r from transmitting antenna to work as reception antenna:
Then by test or utilize existing electromagnetic field simulation software to calculate space attenuation between antenna.Generally according to the actual conditions of aerial position, electromagnetic field simulation software has been set up the simulation model of dual-mode antenna, the space attenuation that calculating transmits when arriving disturbed receiving equipment.
The antijamming capability of general receiving equipment is more intense, and the input power specific sensitivity of its susceptibility correspondence is high a lot.Judge that according to formula (7) whether receiver is disturbed, has:
P
ri(f)+S
m≥P
s′(f) (7)
P
S '(f)---the susceptibility for receiving equipment is generally obtained by test.
S
m---be the margin of safety (margin of safety that national standard requires is 6dB) of receiver.
If the power P of calculating
Ri(f) satisfy formula (7), illustrate that then the transmitter communication band is the receiving equipment generation interference of f to receive frequency outward; Otherwise think be not the receiving equipment generation interference of f to receive frequency.
Illustrate that with an embodiment the inventive method disturbs application in the diagnosis at certain short-wave radio set (as transmitter) to another ultrashort wave radio set (as receiving equipment) below, disturb diagnosis as follows:
Step 1: the behavioral scaling simulation model of setting up the transmitter radio-frequency head.Behavioral scaling simulation model such as Fig. 3 of certain short-wave radio set A transmitter radio-frequency head.Set up the behavioral scaling simulation model: 1 pair of modulation signal of modulation module and carrier signal are modulated, modulation back frequency is 512kHz, carry out first order filtering at filter A2 then, after entering frequency mixer A3 and first local oscillation signal (the first local oscillation signal frequency is 12.466MHz) mixing, output becomes first intermediate-freuqncy signal, first intermediate-freuqncy signal enters filter B4, amplifier A5 carries out filtering, amplify, its output signal becomes second intermediate-freuqncy signal after entering frequency mixer B6 and second local oscillation signal (the second local oscillation signal frequency is 42.978MHz) mixing, second intermediate-freuqncy signal enters filter C7, amplifier B8 carries out filtering, amplify, its output signal is amplified the back through power amplifier 9 and is obtained output radio frequency (RF) signal, frequency 30MHz, emitted power is 12.5W (40.96dBm).
Each electronic circuit module parameter in the transmitter simulation model all is to consult according to the corresponding techniques handbook to obtain.In the circuit simulating software model library, select modulator, filter, modulation module also is provided with outside the relevant parameter, also select nonlinear amplifier, the frequency mixer model, and import actual Amplifier Gain, the port reflection coefficient, 1dB compression point power output, three rank point of cut-off power outputs, obtain the simulation model of amplifier, import the conversion gain of actual frequency mixer, image frequency suppresses, the input and output impedance, prevention at radio-frequency port and intermediate frequency port, the isolation of local oscillator port and prevention at radio-frequency port and local oscillator port and intermediate frequency port, 1dB compression point power output, three rank point of cut-off power outputs, obtain the simulation model of frequency mixer, set up the behavioral scaling simulation model of transmitter radio-frequency head at last.
Step 2: the simulation model in the step 1 is carried out simulation calculation, draw the outer output spectrum of band of transmitter radio-frequency head.
Utilize the harmonic balance simulator, analyze these nonlinearity products of harmonic wave, intermodulation and frequency conversion of a plurality of signals.The outer non-linear combination frequency component mf that causes of analyzing communication frequency band
1+ nf
2+ lf
3+ ... wherein, m=0,1,2 ..., n=0,1,2 ..., l=0,1,2 ...Adopted instantaneous simulator simultaneously, simulation analysis normal signal and interference signal are passed through the transmitter radio-frequency head together, call time domain and to the frequency domain transfer function signal that analyzes are realized the conversion of time domain to frequency domain.
The spectral range of exporting behind the simulation analysis is limited between 30MHz～190MHz, as Fig. 5 is the outer output spectrum figure of band of short-wave radio set transmitter radio-frequency head, and abscissa is that cps is Hz among Fig. 5, and ordinate is an output signal spectrum, unit is dBm, and fs () arrives the frequency domain transfer function for time domain.Among Fig. 5, m
1And m
2Be to be used for the punctuate of reading in the simulation software.From m
2Find out: the intensity of signal is-23.817dBm on the f=60MHz frequency.
Step 3: utilize the outer output spectrum of band in the step 2, calculate P
Ri(f).
Analyze the interference of short-wave radio set A to another ultrashort wave radio set B.Ultrashort wave radio set B working band is 30MHz～88MHz, and the speech receiving sensitivity is not higher than 1.5uV in amplitude modulation (AM), and (FM) is not higher than 0.5uV at frequency modulation.Select the out-of-band radiation of Fig. 5 intermediate waves transmitter at 60MHz.Transmitting antenna and reception antenna all are omnidirectional antenna, two antenna distance 4m, according to formula (3), satisfy Near Field, here according to the actual conditions of aerial position, electromagnetic field simulation software has been set up the simulation model of dual-mode antenna, calculates isolation (also being the space attenuation of the signal) L between dual-mode antenna
a(f) be 65.4dB.
In addition, learn short-wave radio set emission transmission-line attenuation L by consulting technical manual
Ti(f) be 3dB; Ultrashort wave radio set receives transmission-line attenuation L
Ri(f) be 3dB; Learn the gain G of short-wave radio set antenna with the electromagnetic field computed in software at the ultrashort wave antenna receive direction
t(f) be 4dB; The ultrashort wave radio set reception antenna is in the gain G of short-wave radio set antenna transmit direction
t(f) be 3dB.
By (2) formula as can be known:
P
ri＝-23.817dBm-3dB+4dB-65.4dB+3dB-3dB＝-88.217dBm
In order to obtain the susceptibility of ultrashort wave radio set at 60MHz, utilize the voice signal of signal source analog radio conversation, the emission FM signal is to the receiving equipment radio-frequency head, call by the tangible whistle when the ultrashort wave radio set earphone receives for record, the power output of signal source is-85dBm to learn that its sensitivity value is-85dBm.
(6) formula of utilization has
P
ri(f)+S
m＝-82.217dBm≥P
s′＝-85dBm
Hence one can see that on the narrow and small aircraft platform in space, and ultrashort wave radio set B is subjected to the outer non-linear radiated interference that causes of communication band of short-wave radio set A.
Claims (3)
1. the diagnostic method of the outer non-linear interference of transmitter communication band is characterized in that may further comprise the steps:
Step 1: the behavioral scaling simulation model of setting up the transmitter radio-frequency head;
Set up the transmitter radio-frequency head behavioral scaling simulation model of superhet structure, this model comprises modulation module, filter A, frequency mixer A, filter B, amplifier A, frequency mixer B, filter C, amplifier B, power amplifier; Modulation module is modulated modulation signal and carrier signal, enter filter A then and carry out first order filtering, the filtered signal of the first order in frequency mixer A with the first local oscillation signal mixing and form first intermediate-freuqncy signal, first intermediate-freuqncy signal enters filter B subsequently, amplifier A carries out filtering, amplify, its output signal becomes second intermediate-freuqncy signal in frequency mixer B with after the second local oscillation signal mixing then, second intermediate-freuqncy signal enters filter C, amplifier B carries out filtering, amplify, its output signal is amplified the back through power amplifier and is obtained output radio frequency (RF) signal;
The value of the relevant parameter of behavioral scaling simulation model is set: wherein the functional parameter of modulation module includes modulation system, modulation index, carrier signal and frequency modulating signal; The functional parameter of filter A, B, C includes the filtering type, ripple in frequency, pass band, band; The functional parameter of amplifier A, amplifier B, power amplifier includes gain, port reflection coefficient, and the functional parameter of frequency mixer A, frequency mixer B includes conversion gain, image frequency inhibition, local oscillator leakage; In amplifier A, amplifier B, power amplifier and frequency mixer A, frequency mixer B,, 1dB compression point power output and three rank these nonlinear parameters of point of cut-off power output are set according to the technical manual of transmitter.
Step 2: the behavioral scaling simulation model in the step 1 is carried out simulation calculation, draw the outer output spectrum of band of transmitter radio-frequency head;
Step 3: set up the power transfer relation of disturbing between transmitter and the disturbed receiving equipment
P
ri(f)＝P
ti(f)L
tl(f)G
t(f)L
a(f)G
r(f)L
rl(f)
Represent that with dB following formula is: P
Ri(f)=P
Ti(f)-L
Tl(f)+G
t(f)-L
a(f)+G
r(f)-L
Rl(f) and calculate P
Ri(f);
Wherein,
F---can fall into the operating frequency in the receiving equipment passband;
P
Ri(f)---for be coupled to the power of disturbed receiving equipment on the inherent frequency f of frequency acceptance band from the interference transmitter;
P
Ti(f)---the outer power output of band of transmitter radio-frequency head;
G
t(f)---the transmitting antenna power gain;
L
a(f)---space attenuation;
G
r(f)---the reception antenna power gain;
L
Tl(f)---the emission transmission line loss;
L
Rl(f)---receive transmission line loss;
Step 4: according to the P that obtains in the step 3
Ri(f) and disturbed Rule of judgment
P
ri(f)+S
m≥P
s，(f)
The diagnosis transmitter is to the interference of receiving equipment;
P
s, (f)---be the susceptibility of receiving equipment;
S
m---the margin of safety of receiver;
If satisfy P
Ri(f)+S
m〉=P
s, (f), illustrate that then the transmitter communication band is the receiving equipment generation interference of f to receive frequency outward; Otherwise think be not the receiving equipment generation interference of f to receive frequency.
2. the diagnostic method of the outer non-linear interference of transmitter communication band according to claim 1, it is characterized in that: in step 2, adopt the harmonic balance simulator and the instantaneous simulator of analyzing communication system nonlinear characteristic to carry out emulation, emulation draws the outer output spectrum of band of transmitter radio-frequency head, and output spectrum is that abscissa is that frequency, ordinate are the spectrogram of power; Analyze the output spectrum figure of transmitter radio-frequency head, select the frequency that the transmitter communication band produces interference outward.
3. the diagnostic method of the outer non-linear interference of transmitter communication band according to claim 1 is characterized in that: the mentioned space attenuation L in the step 3
a(f) divide following two kinds of situations to calculate:
1. when reception antenna is positioned at the far-field region of transmitting antenna:
In the formula: D is the full-size of transmitting antenna, and r is the distance of transmitting antenna and reception antenna, and unit is m, and λ is the operation wavelength that transmits,
The space attenuation L of transmission signals between transmitter and the receiving equipment
a(f), its unit is dB, calculates according to following formula:
In the formula: f is an operating frequency, and unit is MHz, and v is the propagation velocity that transmits;
2. it is satisfied apart from r from transmitting antenna to work as reception antenna:
Then by test or utilize existing electromagnetic field simulation software to calculate to transmit space attenuation when arriving disturbed antenna of receiving device.
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| CN2008102270743A CN101425857B (en) | 2008-11-20 | 2008-11-20 | Diagnosis method for non-linear interference outside communication band of transmission device |
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