CN116381732B - Efficient GPS P code signal accurate interference method and system - Google Patents
Efficient GPS P code signal accurate interference method and system Download PDFInfo
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- CN116381732B CN116381732B CN202310610548.7A CN202310610548A CN116381732B CN 116381732 B CN116381732 B CN 116381732B CN 202310610548 A CN202310610548 A CN 202310610548A CN 116381732 B CN116381732 B CN 116381732B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002452 interceptive effect Effects 0.000 description 5
- 230000001629 suppression Effects 0.000 description 5
- 238000005314 correlation function Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
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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
- G01S19/015—Arrangements for jamming, spoofing or other methods of denial of service of such systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
- H04L43/0858—One way delays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a high-efficiency P code signal accurate interference method and system for a GPS. The method comprises the following steps: s1, receiving all current visible GPS satellites; s2, acquiring the position of an enemy navigation receiver; s3, calculating the position and clock rate of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satellite; s4, calculating the transmission time delay of the P code signal reaching the enemy navigation receiver according to the distance between the position of the GPS satellite and the position of the navigation receiver and the clock difference; s5, according to the transmission time delayGenerating a P code signal of a GPS at the current moment and an arbitrary pseudo-random sequence with the code rate of 480 Kcps; s6, generating a matching spectrum interference signal according to the P code signal and the pseudo-random sequence of the GPS at the current moment; and S7, modulating the matched spectrum interference signal to the radio frequency of the P code of the GPS and broadcasting the radio frequency through a transmitting antenna. The power required for the same suppressing interference effect in the invention is about 1/20 of that of the prior art.
Description
Technical Field
The invention relates to the technical field of GPS signals, in particular to a high-efficiency P code signal accurate interference method and system of a GPS.
Background
With the widespread use of satellite navigation in military equipment, navigation warfare has become an important component of military countermeasure, where suppressing interference is an important countermeasure to defeat enemy navigation receivers.
The interference suppression strategy is to directly broadcast the interference signal to enable the satellite signal to be completely suppressed by the interference signal, so that an adversary receiver cannot normally receive the satellite signal. The strategy is simple, reliable and effective, but since the pilot signal has a higher spreading gain, higher transmit power is required to suppress interference in order to achieve effective interference.
P code signal of GPS containing interference received by navigation receiver is down converted to baseband, corresponding baseband complex signalThe expression of (2) is:
；
wherein,,the signal power is represented by a signal power,the navigation message is represented by a message of the navigation,the P-code representing a GPS with a code rate of 10.23Mcps,representation codeThe GPS W code with a rate of 480Kcps,indicating the delay of the signal and,indicating the doppler frequency of the light emitted by the light source,indicating the primary phase of the carrier wave,the navigation signal is represented by a navigation signal,representing the interference signal(s),representing thermal noise.
The receiver correlates the baseband signal with the local reproduction signal to obtain a correlation valueThe expression of (2) is:
；
wherein,,representing an estimate of the signal delay,representing an estimate of the doppler frequency,representing an estimate of the primary phase of the carrier,the coherent integration time is represented by a time of day,representing the signal component in the correlation value,represents the interference component in the correlation value,representing the noise component in the correlation value.
Assuming an interfering signalUsing matched spectrum interference, the interfering signal can be regarded as a sumPseudo-random sequences with the same code rate whenAnd (3) withCompletely uncorrelated:
；
wherein,,which is indicative of the power of the interfering signal,a cross-correlation function representing a pseudo-random sequence with a code rate of 10.23 Mcps. It is clear that the effect of the interfering signal depends mainly on the magnitude of the cross-correlation function.
Since the P code of GPS is fully disclosed, when the expression of the interfering signal is:
；
wherein,,representing a difference fromPseudo-random sequence with code rate of 480 Kcps.
At this time, the interference component in the correlation value is:
；
wherein, representRepresenting the cross-correlation function of a pseudo-random sequence with a code rate of 480 Kcps.
It is obvious that, in a statistical sense,is far greater thanThat is, when the interference signal and the true signal have the same time delay P code, the signal is received only with the spread spectrum gain brought by the encrypted W code, so that the accurate interference to the GPS P code receiver can be realized. Based on the method, a high-efficiency P code signal accurate interference method and system of the GPS can be developed.
Disclosure of Invention
The invention aims to provide a high-efficiency P code signal accurate interference method and system for a GPS, which overcome the defects in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a high-efficiency GPS P code signal accurate interference method comprises the following steps:
s1, receiving all current visible GPS satellites;
s2, acquiring the position of the enemy navigation receiver；
S3, calculating the position of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satelliteSum clock difference；
S4, according to the position of the GPS satellitePosition with navigation receiverDistance between them and clock differenceCalculating the transmission delay of P code signal reaching enemy navigation receiver；
S5, according to the transmission time delayGenerating a P-code signal of a GPS at a current timeAnd arbitrary pseudo-random sequence with 480Kcps code rate；
S6, according to the P code signal of the GPS at the current momentAnd pseudo-random sequencesGenerating a matched spectrum interference signal；
S7, matching the spectrum interference signalsThe radio frequency of the P code modulated to GPS is broadcast via the transmitting antenna.
Further, the receiver is adopted to accept all the GPS satellites currently in view in the step S1.
Further, in the step S2, a detection device is used to obtain the position of the enemy navigation receiver。
Further, the step S6 is to match the spectrum interference signalThe specific expression of (2) is:
。
the invention also provides a system of the P code signal accurate interference method of the high-efficiency GPS, which comprises the following steps:
the receiving module is used for receiving all the current visible GPS satellites;
an acquisition module for acquiring the position of the enemy navigation receiver；
A first calculation module for calculating the position of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satelliteSum clock difference；
A second calculation module for calculating the position of the GPS satellitePosition with navigation receiverDistance between them and clock differenceCalculating the transmission delay of P code signal reaching enemy navigation receiver；
A pseudo random sequence generating module for generating a pseudo random sequence according to the transmission delayGenerating a P-code signal of a GPS at a current timeAnd arbitrary pseudo-random sequence with 480Kcps code rate；
A matching spectrum interference signal module for receiving the P code signal of GPS at the current momentAnd pseudo-random sequencesGenerating a matched spectrum interference signal；
A transmitting module for transmitting the matched spectrum interference signalModulating the radio frequency of the P code to the GPS and broadcasting the radio frequency through a transmitting antenna;
the receiving module, the obtaining module, the first calculating module, the second calculating module, the pseudo random sequence generating module, the matching spectrum interference signal module and the transmitting module are sequentially connected.
Compared with the prior art, the invention has the advantages that: the invention can improve the P code interference suppression efficiency of the GPS, and when the position of the enemy navigation receiver is known, the power required for realizing the same interference suppression effect is only about 1/20 of that of the prior art under ideal conditions.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of the P-code signal accurate interference method of the high-efficiency GPS of the present invention.
Fig. 2 is a schematic diagram of a P-code signal accurate interference system of the high efficiency GPS of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1, the embodiment discloses a P-code signal accurate interference method of a high-efficiency GPS, which includes the following steps:
and S1, adopting a receiver to accept all the current visible GPS satellites.
S2, acquiring the position of the enemy navigation receiver by adopting detection equipment such as radar and the like。
Step S3, calculating the position of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satelliteSum clock difference。
Step S4, according to the position of the GPS satellitePosition with navigation receiverDistance between them and clock differenceCalculating the transmission delay of P code signal reaching enemy navigation receiver；
Step S5, according to the transmission time delayGenerating a P-code signal of a GPS at a current timeAnd arbitrary pseudo-random sequence with 480Kcps code rate；
Step S6, according to the P code signal of the GPS at the current momentAnd pseudo-random sequencesGenerating a matched spectrum interference signalThe expression is:
；
step S7, matching the spectrum interference signalsThe radio frequency of the P code modulated to the GPS is broadcast through a transmitting antenna.
Through the steps, the efficiency of P code suppression interference of the GPS can be improved, when the position of an adversary navigation receiver is known, the power required for realizing the same suppression interference effect is only about 1/20 of that of the prior art under ideal conditions, the P code rate is 10.23mcps, and the W code rate480Kcps, a ratio of 10.23M/480K。
The invention also provides a P-code signal accurate interference system of a high-efficiency GPS, which is shown in the figure 2, and comprises: an acceptance module 1 for accepting all GPS satellites currently in view; an acquisition module 2 for acquiring the position of the enemy navigation receiverThe method comprises the steps of carrying out a first treatment on the surface of the A first calculation module 3 for calculating the position of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satelliteSum clock differenceThe method comprises the steps of carrying out a first treatment on the surface of the A second calculation module 4 for calculating the position of the GPS satellitesPosition with navigation receiverDistance between them and clock differenceCalculating the transmission delay of P code signal reaching enemy navigation receiverThe method comprises the steps of carrying out a first treatment on the surface of the A pseudo random sequence generating module 5 for generating a pseudo random sequence based on the transmission delayGenerating a P-code signal of a GPS at a current timeAnd arbitrary pseudo-random sequence with 480Kcps code rateThe method comprises the steps of carrying out a first treatment on the surface of the A matched spectrum interference signal module 6,p-code signal for GPS according to current timeAnd pseudo-random sequencesGenerating a matched spectrum interference signalThe method comprises the steps of carrying out a first treatment on the surface of the A transmitting module 7 for transmitting the matched spectrum interference signalModulating the radio frequency of the P code to the GPS and broadcasting the radio frequency through a transmitting antenna; the receiving module 1, the obtaining module 2, the first calculating module 3, the second calculating module 4, the pseudo random sequence generating module 5, the matching spectrum interference signal module 6 and the transmitting module 7 are connected in sequence.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the patentees may make various modifications or alterations within the scope of the appended claims, and are intended to be within the scope of the invention as described in the claims.
Claims (5)
1. A high-efficiency P code signal accurate interference method of a GPS is characterized by comprising the following steps:
s1, receiving all current visible GPS satellites;
s2, acquiring the position of the enemy navigation receiver；
S3, calculating the position of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satelliteAnd clock error->；
S4, according toGPS satellite positionPosition with navigation receiver>Distance between them and clock difference +.>Calculating the transmission delay of P code signal reaching enemy navigation receiver>；
S5, according to the transmission time delayGenerating a P-code signal of GPS at the current moment +.>And an arbitrary pseudo-random sequence with a code rate of 480Kcps +.>；
S6, according to the P code signal of the GPS at the current momentAnd pseudo-random sequence->Generating a matched spectrum interference signal；
S7, matching the spectrum interference signalsThe radio frequency of the P code modulated to GPS is broadcast via the transmitting antenna.
2. The method of claim 1, wherein the receiver is used to accept all GPS satellites currently in view in step S1.
3. The efficient GPS P-code signal accurate interference method according to claim 1, wherein in said step S2, the position of the enemy navigation receiver is obtained by using a detection device。
4. The P-code signal accurate interference method for high-efficiency GPS according to claim 1, wherein in said step S6, the spectrum interference signal is matchedThe specific expression of (2) is:
。
5. the system of high efficiency GPS P-code signal accurate jamming method according to any of claims 1-4, comprising:
the receiving module is used for receiving all the current visible GPS satellites;
an acquisition module for acquiring the position of the enemy navigation receiver；
A first calculation module for calculating the position of the GPS satellite corresponding to any moment according to the ephemeris of the received GPS satelliteAnd clock error->；
A second calculation module for calculating the position of the GPS satellitePosition with navigation receiver>Distance between them and clock difference +.>Calculating the transmission delay of P code signal reaching enemy navigation receiver>；
A pseudo random sequence generating module for generating a pseudo random sequence according to the transmission delayGenerating a P-code signal of GPS at the current moment +.>And an arbitrary pseudo-random sequence with a code rate of 480Kcps +.>；
A matching spectrum interference signal module for receiving the P code signal of GPS at the current momentAnd pseudo-random sequencesGenerating a matched spectral interference signal->；
A transmitting module for transmitting the matched spectrum interference signalModulating the radio frequency of the P code to the GPS and broadcasting the radio frequency through a transmitting antenna;
the receiving module, the obtaining module, the first calculating module, the second calculating module, the pseudo random sequence generating module, the matching spectrum interference signal module and the transmitting module are sequentially connected.
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