CN110412621A - A kind of compatible appraisal procedure of pulse radiation frequency interference of satellite navigation receiver - Google Patents
A kind of compatible appraisal procedure of pulse radiation frequency interference of satellite navigation receiver Download PDFInfo
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- CN110412621A CN110412621A CN201910533764.XA CN201910533764A CN110412621A CN 110412621 A CN110412621 A CN 110412621A CN 201910533764 A CN201910533764 A CN 201910533764A CN 110412621 A CN110412621 A CN 110412621A
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- receiver
- satellite navigation
- appraisal procedure
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
-
- 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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
Abstract
The invention discloses a kind of pulse radiation frequencies of satellite navigation receiver to interfere compatible appraisal procedure, and steps are as follows for the appraisal procedure: defining the impact factor α of pulse recurrence frequencyPRF；According to impact factor αPRFCorrect the equivalent duty ratio PDC of saturation type receivereff1With the equivalent duty ratio PDC of blanking type receivereff2；Effective carrier-to-noise ratio of saturation type receiver is corrected according to the equivalent duty ratio of revised saturation type receiver；Effective carrier-to-noise ratio of blanking type receiver is corrected according to the equivalent duty ratio of revised blanking type receiver.The present invention compares existing ITU appraisal procedure to effective carrier-to-noise ratio of the satellite navigation receiver under impulse disturbances, increase pulse recurrence frequency, two influence factors of integral cleaning frequency of receiver, the variation for making the pulse radiation frequency of satellite navigation receiver of the present invention that compatible appraisal procedure be interfered to can adapt to wider array of pulse width, the calculated effective carrier-to-noise ratio of institute and receiver output are closer, and assessment result is more acurrate.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly to a kind of pulse radiation frequency of satellite navigation receiver
Interfere compatible appraisal procedure.
Background technique
The characteristics of due to satellite navigation signals itself, the signal power for reaching ground is very small, leads to its carrier-to-noise ratio very
It is low, it is calculated by 20000 kilometers of the Beidou navigation satellite distance earth, surface noise temperature 300K is calculated, when signal reaches ground
Carrier-to-noise ratio be about -19db, be highly prone to the influence and interference of electromagnetic signal.Even if not considering the intentional interference of military equipment,
A large amount of signals existing for civil field emit equipment, such as broadcast and TV radiating station, microwave transport equipment, terrestrial cellular net base
It stands, without effectively planning, can all produce serious influence to satellite navigation receiver, therefore there is an urgent need to
From the higher level face of wireless frequency spectrum management, formulate in terms of receiver interference protection, the not signal compatibility of homologous ray
Whole Managed Solution.
At present to satellite navigation system, in terms of the compatible Journal of Sex Research of other systems, International Telecommunication Association (ITU) is being carried out
The standardization effort of these compatible appraisal procedures.The research institution of various countries submits the research achievement of oneself simultaneously to International Telecommunication Association
It discusses, some of the recommendations scheme and research report, such as ITU-R-REP-M.2220, ITU-R-REC- is formed with the name of International Telecommunication Association
M.1831, ITU-R-REP-RS.2311 etc..The appraisal procedure proposed in these documents is mainly with effective carrier-to-noise ratio of receiver
As the evaluation index of system compatibility, and the calculation method of effectively carrier-to-noise ratio is according to the different type of receiver and not
Together.Since satellite navigation system itself and its receiver technology are also constantly improve among development, these existing assessments
Technology is simultaneously not perfect, it is still necessary to combine with practice, its adaptive surface and accuracy is gradually increased, therefore, ITU is in above-mentioned file
It is recommended that there is still a need for the influences to impulse disturbances to continue to study, proposition is more in line with actual appraisal procedure.
In the compatible assessment report (ITU-R-REC-M.1831) of the impulse disturbances of International Telecommunication Association's publication, by receiver
It is divided into blanking type and saturation type two types in the form of front-end processing pulse interference signal, has formulated effective load respectively accordingly and made an uproar
The calculation method of ratio.Wherein, effective carrier-to-noise ratio is defined as the carrier power after the correlator of navigation neceiver and all interference
The ratio between with noise power.Since pulse interference signal is spread when by correlator by local pseudo-random sequence, this is in calculating
It is when interfering signal power that its is equivalent for a broadband noise, therefore effectively carrier-to-noise ratio is alternatively referred to as equivalent carrier-to-noise ratio.
Effective carrier-to-noise ratio in saturation type receiver defined in ITU-R-REP-M.2220 suggestion is following calculation formula:
Wherein:
C: the carrier power of satellite navigation signals；
N0,EFF: effective noise power；
N0: the thermal noise power spectral density (W/Hz) of receiver；
I0,WB: the power spectrum density (W/Hz) of continuous radio frequency interference in receiver signal broadband；
PDCLIM: the set duty ratio (score of no unit) of multiple saturation radio-frequency pulses；
RI: the ratio between average power density and N0 of saturation threshold sum pulse interference below (no unit)；
For blanking type receiver, effective carrier-to-noise ratio calculation formula of use is as follows:
Wherein:
C: the carrier power (W) of satellite-signal；
N0: the thermal noise power spectrum density (W/Hz) of receiver；
I0,WB: whole continuous radio frequency interference power spectral densities (W/Hz)；
PDCB: the duty ratio of the sum pulse interference beyond thresholding；
RI: lower than the average interference power spectrum density of blanking threshold value and the ratio of N0.
It can be seen that, unique parameters related with impulse waveform are the duties of pulse from above-mentioned effective carrier-to-noise ratio calculating formula
Than.However, there are also pulse recurrence frequency, the parameters such as pulse width for the waveform parameter of actual pulse signal.With identical duty
The pulse of ratio may have different pulse recurrence frequencies (duration of respective pulses is also different).Actual test discovery, for
Saturation type receiver, when duty ratio is identical, and the width (time span) of pulse much smaller than correlator integration time interval (often
Rule integration time interval is 1ms) when, under different integration time interval (or integrator cleaning frequency), effective carrier-to-noise ratio is with applying
The degree of the interference value decline added is different.This difference be up to 3dB or so (pulse recurrence frequency from 250Hz to
3600Hz variation), and cleaning frequency is lower, carrier-to-noise ratio penalty value (drop-out value) is bigger.Therefore, the phenomenon explanation in above-mentioned test
Effective carrier-to-noise ratio and the pulse recurrence frequency in interference signal parameters and the integral cleaning frequency in receiver parameters have
It closes, and does not reflect such case in effective carrier-to-noise ratio calculation formula above-mentioned, assessment result is caused error occur.
Summary of the invention
The present invention is in order to solve the load of the effective carrier-to-noise ratio and receiver that obtain using the appraisal procedure of the above prior art
It makes an uproar and there are problems that error than output valve, compatible appraisal procedure is interfered in the pulse radiation frequency for providing a kind of satellite navigation receiver,
It is able to reflect the influence that cleaning frequency is integrated in the correlator circuit of satellite navigation receiver, enables to assess calculated result more
Accurately effective carrier-to-noise ratio output valve of the practical receiver of reflection, so that the pulse radiation frequency to receiver interferes compatible assessment more
It is accurate to add.
To realize aforementioned present invention purpose, the technical solution adopted is as follows: a kind of pulse radiation frequency of satellite navigation receiver
Interfere compatible appraisal procedure, the appraisal procedure the following steps are included:
S1: the impact factor α of pulse recurrence frequency is definedPRF, the impact factor αPRFIndicate carrier-to-noise ratio relative to reception
The integral cleaning frequency of machine is fdWhen carrier-to-noise ratio correction amount；
S2: according to impact factor αPRFCorrect the equivalent duty ratio PDC of saturation type receivereff1It is received with amendment blanking type
The equivalent duty ratio PDC of machineeff2；
S3: effective carrier-to-noise ratio of saturation type receiver is corrected according to the equivalent duty ratio of revised saturation type receiver；
S4: effective carrier-to-noise ratio of blanking type receiver is corrected according to the equivalent duty ratio of revised blanking type receiver.
Preferably, step S1, the impact factor, specific formula expression are as follows:
In formula: PRF indicates pulse recurrence frequency；β indicates index value, is determined according to measured value.
Further, the β is 0.1.
Still further, step S2, the equivalent duty ratio PDC of the saturation type receivereff1, specific formula is as follows:
PDCeff1=PDCLIMαPRF
In formula: PDCLIMIndicate the set duty ratio of multiple saturation radio-frequency pulses.
Still further, step S2, the equivalent duty ratio PDC of the blanking type receivereff2, specific formula is as follows:
PDCeff2=PDCBαPRF
In formula: PDCBIndicate the duty ratio that the sum pulse beyond thresholding interferes.
Still further, step S3, effective carrier-to-noise ratio of the saturation type receiver, specific formula is as follows:
In formula:
C: the carrier power of satellite navigation signals；
N0,EFF: effective noise power；
N0: the thermal noise power spectral density of receiver, unit are as follows: W/Hz；
I0,WB: the power spectrum density of continuous radio frequency interference, unit are as follows: W/Hz in receiver signal broadband；
RI: the ratio between average power density and N0 of saturation threshold sum pulse interference below；
NLIM: the ratio between saturation level and 1 σ voltage of thermal noise of receiver analog-digital converter.
Still further, step S3, effective carrier-to-noise ratio of the blanking type receiver, specific formula is as follows:
Beneficial effects of the present invention are as follows: effective carrier-to-noise ratio phase of the present invention to satellite navigation receiver under impulse disturbances
Than existing ITU appraisal procedure, pulse recurrence frequency, two influence factors of integral cleaning frequency of receiver are increased, makes this
The compatible appraisal procedure of pulse radiation frequency interference of the invention satellite navigation receiver can adapt to the change of wider array of pulse width
Change, the calculated effective carrier-to-noise ratio of institute and receiver output are closer, and assessment result is more acurrate.
Detailed description of the invention
Fig. 1 is the step flow chart that compatible appraisal procedure is interfered in the pulse radiation frequency of this implementation satellite navigation receiver.
Fig. 2 is the flow diagram of the present embodiment experiment.
Fig. 3 is the connection figure in kind of the present embodiment experiment.
Fig. 4 is the impulse disturbances radiofrequency signal that the present embodiment verifying generates.
Receiver output parameter when Fig. 5 is the present embodiment experiment.
Fig. 6 is the equivalent carrier-to-noise ratio deterioration that the prior art is tested.
Fig. 7 is the error amount of the assessed value that the prior art is tested and measured value.
Fig. 8 is that a kind of pulse radiation frequency of satellite navigation receiver described in the present embodiment interferes compatible appraisal procedure to test to obtain
Assessed value and measured value error amount.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and detailed description.
Embodiment 1
As shown in Figure 1, compatible appraisal procedure is interfered in a kind of pulse radiation frequency of satellite navigation receiver, comprising the following steps:
S1: the impact factor α of pulse recurrence frequency is definedPRF, the actual effect of the impact factor influence duty ratio, tool
Body formula expression are as follows:
In formula: PRF indicates pulse recurrence frequency；β indicates index value, is determined according to measured value.
The impact factor αPRFExpression carrier-to-noise ratio is f relative to the integral cleaning frequency of receiverdWhen carrier-to-noise ratio repair
Positive quantity.The present embodiment determines that β is 0.1 according to existing measured value.
S2: according to impact factor αPRFCorrect the equivalent duty ratio PDC of saturation type receivereff1, specifically, the saturation
The equivalent duty ratio PDC of type receivereff1Expression formula it is as follows:
In formula: PDCLIMIndicate the set duty ratio of multiple saturation radio-frequency pulses.
The equivalent duty ratio PDC of the blanking type receivereff2, expression is as follows:
In formula: PDCBIndicate the duty ratio that the sum pulse beyond thresholding interferes.
S3: effective carrier-to-noise ratio of saturation type receiver is corrected according to the equivalent duty ratio of revised saturation type receiver；
The expression formula of effective carrier-to-noise ratio of the revised saturation type receiver is as follows:
In formula:
C: the carrier power of satellite navigation signals；
N0,EFF: effective noise power；
N0: the thermal noise power spectral density of receiver, unit are as follows: W/Hz；
I0,WB: the power spectrum density of continuous radio frequency interference, unit are as follows: W/Hz in receiver signal broadband；
RI: the ratio between average power density and N0 of saturation threshold sum pulse interference below；
NLIM: the ratio between saturation level and 1 σ voltage of thermal noise of receiver analog-digital converter.
S4: effective carrier-to-noise ratio of blanking type receiver is corrected according to the equivalent duty ratio of revised blanking type receiver；
The expression formula of effective carrier-to-noise ratio of the revised blanking receiver is as follows:
Compatible appraisal procedure effect is interfered in order to verify the pulse radiation frequency of satellite navigation receiver described in the present embodiment, this
Implement to carry out half chemical examination card in kind based on equipment such as analysis and assessment software and Beidou receivers, as shown in Figure 2: test procedure is specific
It is as follows:
1. analog pulse interference signal, the building of pulse interference signal is completed in this experiment by standard signal source；
2. scrnario testing: working condition of the test Beidou receiver under the effect of certain pulses interference source, and obtain identical
The operation result of analysis and assessment demoware under Parameter Conditions；
3. a pair scrnario testing result is handled and is analyzed；
4. a large amount of tests, and counted, analysis Comparative result verifying.
Specific test scene is as shown in figure 3, receive true Beidou II satellite navigation letter using navigation neceiver in kind
Number, the impulse disturbances radiofrequency signal needed is generated using signal source, is added in receiver by radio frequency threeway.
Signal source use Agilent E4438C, connect PC test lead, PC test lead with pulse generate document control its
The pulse needed is generated, the pulse of generation is as shown in Figure 4.
A variety of single modes or multimode GNSS Beidou receiver can be used in the verification test, statistics takes mean value to be analyzed.It can
PC test lead output receiver related data is connected, as shown in Figure 5.
The equivalent carrier-to-noise ratio for recording the impulse disturbances parameter tested every time and receiver output, to each different parameters
Pulse is repeatedly tested and is averaged, and is further processed to obtain the penalty value of equivalent carrier-to-noise ratio.By test result and software evaluation knot
Fruit compares and analyzes.
The experimental result of the compatible assessment report (ITU-R-REP-M.2220) of the impulse disturbances of International Telecommunication Association's publication:
Equivalent load caused by newly-increased pulse based on difference PDC under the available different impulse disturbances of International Telecommunication Association's model is made an uproar
It is compared than deterioration, and with measured data, obtains the error of model evaluation value and measured value, as shown in Figures 6 and 7.
A kind of experimental result of the compatible appraisal procedure of pulse radiation frequency interference of satellite navigation receiver described in the present embodiment: base
Equivalent load caused by the newly-increased pulse of difference PDC is made an uproar under the available different impulse disturbances of model of the present embodiment technical solution
It is compared than deterioration, and with measured data, obtains the error of model evaluation value and measured value, as shown in Figure 8.
It is obtained according to the above experimental data:
1. International Telecommunication Association publication impulse disturbances compatible assessment report (ITU-R-REP-M.2220) repetition rate compared with
Gao Shida 4dB；
2. the equivalent carrier-to-noise ratio of receiver caused by the pulse by the multiple test statistics different parameters of experiment deteriorates mean value, with
The result that a kind of pulse radiation frequency of satellite navigation receiver described in the present embodiment interferes compatible appraisal procedure to be calculated into
Row comparison, difference is largely distributed in 1dB and hereinafter, part is distributed in 1~2.5dB；
It is comprehensive it is found that a kind of pulse radiation frequency of satellite navigation receiver described in the present embodiment interferes compatible appraisal procedure ratio to adopt
When being assessed with prior art ITU model, error can be effectively reduced, moreover, closer, when higher in repetition rate
Application scenarios under, in the case where assessment models and constant optimization method, it is only necessary to according to special scenes reset amendment influence
Match value in the factor can achieve the effect that improve assessment errors.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.Any modification done within the spirit and principles of the present invention and changes equivalent replacement
Into etc., it should all be included in the scope of protection of the claims of the present invention.
Claims (7)
1. compatible appraisal procedure is interfered in a kind of pulse radiation frequency of satellite navigation receiver, it is characterised in that: the appraisal procedure packet
Include following steps:
S1: the impact factor α of pulse recurrence frequency is definedPRF, the impact factor αPRFIndicate carrier-to-noise ratio relative to receiver
Integral cleaning frequency is fdWhen carrier-to-noise ratio correction amount；
S2: according to impact factor αPRFCorrect the equivalent duty ratio PDC of saturation type receivereff1With equivalent the accounting for of blanking type receiver
Sky ratio PDCeff2；
S3: effective carrier-to-noise ratio of saturation type receiver is corrected according to the equivalent duty ratio of revised saturation type receiver；
S4: effective carrier-to-noise ratio of blanking type receiver is corrected according to the equivalent duty ratio of revised blanking type receiver.
2. compatible appraisal procedure is interfered in the pulse radiation frequency of satellite navigation receiver according to claim 1, it is characterised in that:
Step S1, the impact factor, specific formula expression are as follows:
In formula: PRF indicates pulse recurrence frequency；β indicates index value, is determined according to measured value.
3. compatible appraisal procedure is interfered in the pulse radiation frequency of satellite navigation receiver according to claim 2, it is characterised in that:
The β is 0.1.
4. compatible appraisal procedure is interfered in the pulse radiation frequency of satellite navigation receiver according to claim 2, it is characterised in that:
Step S2, the equivalent duty ratio PDC of the saturation type receivereff1, specific formula is as follows:
PDCeff1=PDCLIMαPRF
In formula: PDCLIMIndicate the set duty ratio of multiple saturation radio-frequency pulses.
5. compatible appraisal procedure is interfered in the pulse radiation frequency of satellite navigation receiver according to claim 4, it is characterised in that:
Step S2, the equivalent duty ratio PDC of the blanking type receivereff2, specific formula is as follows:
PDCeff2=PDCBαPRF
In formula: PDCBIndicate the duty ratio that the sum pulse beyond thresholding interferes.
6. compatible appraisal procedure is interfered in the pulse radiation frequency of satellite navigation receiver according to claim 5, it is characterised in that:
Step S3, effective carrier-to-noise ratio of the saturation type receiver, specific formula is as follows:
In formula:
C: the carrier power of satellite navigation signals；
N0,EFF: effective noise power；
N0: the thermal noise power spectral density of receiver, unit are as follows: W/Hz；
I0,WB: the power spectrum density of continuous radio frequency interference, unit are as follows: W/Hz in receiver signal broadband；
RI: the ratio between average power density and N0 of saturation threshold sum pulse interference below；
NLIM: the ratio between saturation level and 1 σ voltage of thermal noise of receiver analog-digital converter.
7. compatible appraisal procedure is interfered in the pulse radiation frequency of satellite navigation receiver according to claim 6, it is characterised in that:
Step S3, effective carrier-to-noise ratio of the blanking type receiver, specific formula is as follows:
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| CN113206714A (en) * | 2021-05-10 | 2021-08-03 | 北京航空航天大学 | Receiver pulse signal interference evaluation method based on bit error rate |
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| CN113206714A (en) * | 2021-05-10 | 2021-08-03 | 北京航空航天大学 | Receiver pulse signal interference evaluation method based on bit error rate |
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