CN115453575A - Beidou third-model dual-mode self-adaptive anti-interference antenna and receiver system - Google Patents

Beidou third-model dual-mode self-adaptive anti-interference antenna and receiver system Download PDF

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CN115453575A
CN115453575A CN202210975213.0A CN202210975213A CN115453575A CN 115453575 A CN115453575 A CN 115453575A CN 202210975213 A CN202210975213 A CN 202210975213A CN 115453575 A CN115453575 A CN 115453575A
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interference
module
antenna
signal
digital
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施欢冬
张瑞
张文
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Jiangsu Xingyuxinlian Electronics Technology Co ltd
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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
    • 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
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/243—Demodulation of navigation message
    • 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
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42—Determining position
    • G01S19/421—Determining position by combining or switching between position solutions or signals derived from different satellite radio beacon positioning systems; by combining or switching between position solutions or signals derived from different modes of operation in a single system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/106—Microstrip slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 
    • 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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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The invention discloses a Beidou third-model dual-mode self-adaptive anti-interference antenna which comprises an antenna module and an anti-interference module, wherein the antenna module is used for transmitting radio frequency signals, and the anti-interference module is used for performing anti-interference processing on the radio frequency signals output by the antenna module; the antenna module comprises a microstrip antenna module, a double-frequency equal power distributor and a microwave band-pass filter, wherein the microstrip antenna module comprises a microstrip antenna, the microstrip antenna is formed by attaching a conductor sheet on a dielectric substrate with a conductor grounding plate, and the microstrip antenna is used for exciting a radio frequency electromagnetic field between the conductor sheet and the grounding plate by utilizing microstrip or coaxial line feeding. The invention also discloses a receiver system. According to the antenna, the antenna module is used for transmitting radio-frequency signals, and the anti-interference module is used for performing anti-interference processing on the radio-frequency signals output by the antenna module, so that the anti-interference capability of the antenna is improved, and the safety and accuracy of signal transmission are improved.

Description

Beidou No. three dual-mode self-adaptive anti-interference antenna and receiver system
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a Beidou third-order dual-mode self-adaptive anti-interference antenna and a receiver system.
Background
The mobile communication is an indispensable important component in current social life and also is a public technical field of rapid development in recent years, the GPS/Beidou satellite becomes an international standard as a part of communication technology application, the GPS/Beidou satellite is widely applied to navigation, measurement, communication, time service and other aspects at present, the GPS/Beidou signal carries fixed synchronous signals, and in the field of mobile communication, the GPS/Beidou time service mainly provides reference synchronous signals during data transmission.
The present big dipper No. three bimodulus self-adaptation anti-interference antenna of big dipper and receiver system still have some problems at present: the Beidou No. three dual-mode self-adaptive anti-interference antenna and the receiver system are poor in anti-interference capability, safety accuracy in signal transmission is reduced, and meanwhile, in order to resist interference, power consumption of the antenna is greatly increased.
Disclosure of Invention
The invention aims to provide a Beidou third-class dual-mode self-adaptive anti-interference antenna and a receiver system, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a Beidou No. three dual-mode self-adaptive anti-interference antenna comprises an antenna module and an anti-interference module, wherein the antenna module is used for transmitting radio frequency signals, and the anti-interference module is used for carrying out anti-interference processing on the radio frequency signals output by the antenna module;
the antenna module comprises a microstrip antenna module, a dual-frequency equal power distributor and a microwave band-pass filter;
the microstrip antenna module comprises a microstrip antenna, the microstrip antenna is formed by attaching a conductor sheet on a dielectric substrate with a conductor grounding plate, and the microstrip antenna is used for exciting a radio frequency electromagnetic field between the conductor patch and the grounding plate by utilizing microstrip or coaxial line feeding and radiating outwards through a gap between the patch and the grounding plate;
the double-frequency equal power divider is used for dividing two frequencies of the same feeding point into equal power;
the microwave band-pass filter is used for realizing double-frequency circular polarization through the same feed point, so that a plurality of frequencies are separated and enter different channels;
the anti-interference module comprises an interference detection module, a radio frequency front-end module, a branch selection switch, an anti-interference processing module, a switching module, a main channel and an auxiliary channel.
Preferably, the main channel is a receiving channel for one of the groups of signals, the auxiliary channel is a receiving channel for signals other than the one group of signals, and both the main channel and the auxiliary channel are provided with an AD analog-to-digital converter and a DA digital-to-analog converter.
Preferably, the input end of the branch selection switch is respectively connected with the AD analog-to-digital converter of the main channel and one output end of the interference detection module, one output end of the branch selection switch is connected with the anti-interference processing module, the other output end of the branch selection switch is connected with the main channel and the DA analog-to-digital converter of the auxiliary channel, the input end of the anti-interference processing module is further respectively connected with the AD analog-to-digital converter output end of the auxiliary channel, and the output end of the anti-interference processing module is connected with the AD analog-to-digital converter of the main channel and the DA digital-to-analog converter of the auxiliary channel.
Preferably, the switching module includes power supply switches, which are connected in parallel and have the number corresponding to that of the auxiliary channels, and controlled ends of the power supply switches are respectively connected with the output end of the interference detection module.
Preferably, the calculation formula of the attenuation from the interference source in the anti-interference module to the aperture surface of the antenna to be tested is as follows:
L2 i ＝R i +L 1 -G 0
wherein, L2 i For attenuation of interference sources to the face of the antenna to be measured, R i For receiving a power value, L, transmitted by the spectrum analyzer 1 For cable losses, G, between the antenna and the spectrum analyzer 0 Is the antenna gain.
Preferably, the interference resistance in the interference rejection module is calculated by the following formula:
T i ＝P r +L2 i
(J/S) dB ＝T i -L2 i -(-130dBm)
wherein, T i For transmitting power, P, to the interference source r In order to preset the power value of the interface of the antenna to be measured, J represents the power of the interference signal, and S represents the power of the satellite signal.
Preferably, the anti-interference processing method in the anti-interference module includes the following steps:
s1, intermediate frequency signal sampling: receiving N paths of analog intermediate frequency signals from a radio frequency front end module through an AD (analog-to-digital) converter and a DA (digital-to-analog) converter, carrying out quantization processing on the received analog intermediate frequency signals, and outputting N paths of digital intermediate frequency signals;
s2, carrying out digital band-pass filtering and digital down-conversion processing on N paths of digital intermediate-frequency signals output by the AD analog-to-digital converter and the DA digital-to-analog converter to convert the signals into N paths of baseband complex signals;
s3, inputting the N baseband complex signals into a digital delay line, and combining all tap data to form a space-time vector signal X st ＝[x 11 ,x 12 ,L,x 1M ,x 21 ,x 22 ,L,x 2M ,L,x N1 ,x N2 ,L x NM ]Wherein M is the number of taps;
s4, block processing is carried out on the space-time vector signal data of each p snapshots, and an autocorrelation matrix is calculated:
Figure BDA0003795971310000031
wherein p is the number of beats [.] H Representing a conjugate transpose matrix; x st (k) A space-time vector signal of the kth snapshot;
s5, carrying out space-time weight W according to the following formula st ＝[w st11 ,w st12 ,L,w stNM ]Solving:
Figure BDA0003795971310000032
wherein R is st -1 R obtained for S4 st The inverse matrix of (d); a is a st In the form of a space-time steering vector,
Figure BDA0003795971310000033
in the formula
Figure BDA0003795971310000034
Which represents the product of the Kronecker reaction,
Figure BDA0003795971310000035
is a space-domain steering vector, and is,
Figure BDA0003795971310000036
[x n ,y n ,z n ]is the spatial coordinate of the antenna array T element n [ ·] T Is transposed, i is dot multiplied, θ is summed
Figure BDA0003795971310000041
Elevation and azimuth of the spatial signal, respectively; a is a t ＝[1,0…0]The vector is a time domain guide vector, and the length of the vector is M;
s6, calculating the obtained space-time weight W st ＝[w st11 ,w st12 ,L,w stNM ]As the beginning of CNLMS iterationStarting weight value W (1), and iterating through the following formula:
W(1)＝[w st11 ,w st12 ,…w stNM ]
P 0 ＝I-a st (a st H *ast) -1 a st
S＝a st (a st H *a st ) -1
y(n)＝W(n) H X st (n),n＝1,2,…
W(n+1)＝P 0 (W(n)-μX st (n)y(n) * /(X st (n) H X st (n)))-S,n＝1,2,…
wherein, W (1) is an initial weight; y (n) is the beamformed output signal; μ is the iteration step size, μ<1；P 0 S is a st A determined constant;
the iteration is continuously carried out until the space-time weight values obtained by the block processing of S4 and S4 are updated, the iteration of the current round is finished, and the next round of iteration is started by taking the new space-time weight value as the initial weight value W (1);
s7, a signal y (n) finally output in each iteration process is a useful signal subjected to anti-interference processing;
and S8, performing digital up-conversion on the anti-interference processed signal y (n), and converting the signal y (n) into an analog intermediate frequency signal through a digital-to-analog conversion module.
The invention also provides a receiver system, which comprises the Beidou three-mode self-adaptive anti-interference antenna, and further comprises a navigation processing module, a signal receiving module and a power module, wherein the power module is connected with the navigation processing module, the signal receiving module is connected with the navigation processing module and transmits received satellite signals to the navigation processing module for processing, the navigation processing module comprises a main processing unit, a positioning unit, an anti-interference unit, an interface unit and a human-computer interaction unit, the main processing unit is respectively connected with the positioning unit, the interface unit and the human-computer interaction unit, and the positioning unit adopts a Beidou/GPS dual-system positioning unit and is connected with the signal receiving module through the anti-interference unit.
Preferably, the navigation processing module comprises an adaptive anti-interference filter, a baseband signal processor and a central processing unit; the self-adaptive anti-interference filter carries out interference filtering processing on the output digital intermediate frequency signal to generate a filtering signal; the baseband signal processor receives the filtered signal; the filtering signals are distributed and configured by a satellite channel, acquisition, tracking and text demodulation are executed by each satellite channel, and a signal-to-noise ratio estimation signal processing algorithm is completed by a software program executed by the central processing unit and the baseband signal processor.
Preferably, the power module adopts a main and standby power supply mode, the power module is powered by a 220V alternating current power supply or a 24V direct current power supply, and the power module processes an input power supply and outputs a stable direct current power supply to supply power to the navigation processing module.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the antenna, the antenna module is used for transmitting radio-frequency signals, and the anti-interference module is used for performing anti-interference processing on the radio-frequency signals output by the antenna module, so that the anti-interference capability of the antenna is improved, and the safety and accuracy of signal transmission are improved.
(2) According to the invention, the interference detection module, the radio frequency front-end module, the branch selection switch, the anti-interference processing module, the switching module, the main channel and the auxiliary channel are arranged on the anti-interference module, so that interference signals can be detected and distinguished, when interference does not exist or is small, down-conversion processing of other receiving channels is turned off, and meanwhile, the anti-interference module is turned off to be directly switched to a normal operation state, so that the power consumption is greatly reduced.
(3) The receiver adopts GPS satellite positioning and Beidou system positioning, and autonomously adopts GPS navigation positioning in a combined positioning mode, so that the positioning precision is improved, not only can the Beidou satellite positioning be carried out, but also the GPS positioning and dual-system combined positioning can be carried out, and the accuracy of signal receiving is improved.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a block diagram of an antenna module according to the present invention;
FIG. 3 is a second block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a Beidou third-class dual-mode self-adaptive anti-interference antenna comprises an antenna module and an anti-interference module, wherein the antenna module is used for transmitting radio frequency signals, and the anti-interference module is used for performing anti-interference processing on the radio frequency signals output by the antenna module;
the antenna module comprises a microstrip antenna module, a dual-frequency equal power distributor and a microwave band-pass filter;
the microstrip antenna module comprises a microstrip antenna, the microstrip antenna is formed by attaching a conductor sheet on a dielectric substrate with a conductor grounding plate, and the microstrip antenna is used for exciting a radio frequency electromagnetic field between the conductor patch and the grounding plate by utilizing microstrip or coaxial line feeding and radiating outwards through a gap between the patch and the grounding plate;
the double-frequency equal power divider is used for dividing two frequencies of the same feeding point into equal power;
the microwave band-pass filter is used for realizing double-frequency circular polarization through the same feed point, so that a plurality of frequencies are separated and enter different channels;
the anti-interference module comprises an interference detection module, a radio frequency front-end module, a branch selection switch, an anti-interference processing module, a switching module, a main channel and an auxiliary channel.
In this embodiment, preferably, the main channel is a receiving channel of one of the groups of signals, the auxiliary channel is a receiving channel of a signal other than the one of the groups of signals, and both the main channel and the auxiliary channel are provided with an AD analog-to-digital converter and a DA digital-to-analog converter.
In this embodiment, preferably, an input end of the branch selection switch is connected to an output end of the AD analog-to-digital converter of the main channel and an output end of the interference detection module, an output end of the branch selection switch is connected to the anti-interference processing module, another output end of the branch selection switch is connected to the main channel and the DA analog-to-digital converter of the auxiliary channel, an input end of the anti-interference processing module is further connected to an output end of the AD analog-to-digital converter of the auxiliary channel, and an output end of the anti-interference processing module is connected to the main channel and the DA analog-to-digital converter of the auxiliary channel.
In this embodiment, preferably, the switching module includes power supply switches that are arranged in parallel and have the number corresponding to that of the auxiliary channels, and controlled ends of the power supply switches are respectively connected to the output end of the interference detection module.
In this embodiment, preferably, an attenuation calculation formula from an interference source in the anti-interference module to the aperture surface of the antenna to be measured is as follows:
L2 i ＝R i +L 1 -G 0
wherein, L2 i For attenuation of interference sources to the face of the antenna to be measured, R i For receiving a power value, L, transmitted by the spectrum analyzer 1 For cable losses between antenna and spectrum analyzer, G 0 Is the antenna gain.
In this embodiment, preferably, the interference resistance in the anti-interference module is calculated by the following formula:
T i ＝P r +L2 i
(J/S) dB ＝T i -L2 i -(-130dBm)
wherein, T i For transmitting power, P, to the interference source r In order to preset the power value of the interface of the antenna to be measured, J represents the power of the interference signal, and S represents the power of the satellite signal.
In this embodiment, preferably, the anti-interference processing method in the anti-interference module includes the following steps:
s1, intermediate frequency signal sampling: receiving N paths of analog intermediate frequency signals from a radio frequency front end module through an AD (analog-to-digital) converter and a DA (digital-to-analog) converter, carrying out quantization processing on the received analog intermediate frequency signals, and outputting N paths of digital intermediate frequency signals;
s2, carrying out digital band-pass filtering and digital down-conversion processing on N paths of digital intermediate-frequency signals output by the AD analog-to-digital converter and the DA digital-to-analog converter to convert the signals into N paths of baseband complex signals;
s3, inputting the N baseband complex signals into a digital delay line, and combining all tap data to form a space-time vector signal X st ＝[x 11 ,x 12 ,L,x 1M ,x 21 ,x 22 ,L,x 2M ,L,x N1 ,x N2 ,L x NM ]Wherein M is the number of taps;
s4, block processing is carried out on the space-time vector signal data of each p snapshots, and an autocorrelation matrix is calculated:
Figure BDA0003795971310000081
wherein p is the number of beats [.] H Representing a conjugate transpose matrix; x st (k) A space-time vector signal of the kth snapshot;
s5, carrying out space-time weight W according to the following formula st ＝[w st11 ,w st12 ,L,w stNM ]Solving:
Figure BDA0003795971310000082
wherein R is st -1 R obtained for S4 st The inverse matrix of (d); a is st In the form of a space-time steering vector,
Figure BDA0003795971310000083
in the formula
Figure BDA0003795971310000084
The product of the Kronecker is expressed,
Figure BDA0003795971310000085
is a space-domain steering vector, and is,
Figure BDA0003795971310000086
[x n ,y n ,z n ]is the spatial coordinate of the antenna array T-element n [ ·] T For transposition, i is dot product, θ is sum
Figure BDA0003795971310000087
Elevation and azimuth of the spatial signal, respectively; a is a t ＝[1,0…0]The vector is a time domain guide vector, and the length of the vector is M;
s6, calculating the obtained space-time weight W st ＝[w st11 ,w st12 ,L,w stNM ]As an initial weight W (1) of CNLMS iteration, iteration is performed by the following formula:
W(1)＝[w st11 ,w st12 ,…w stNM ]
P 0 ＝I-a st (a st H *ast) -1 a st
S＝a st (a st H *a st ) -1
y(n)＝W(n) H X st (n),n＝1,2,…
W(n+1)＝P 0 (W(n)-μX st (n)y(n) * /(X st (n) H X st (n)))-S,n＝1,2,…
wherein, W (1) is an initial weight; y (n) is the beamformed output signal; μ is the iteration step size, μ<1；P 0 S is a st A determined constant;
the iteration is continuously carried out until the space-time weight values obtained by the block processing of S4 and S4 are updated, the iteration of the current round is finished, and the next round of iteration is started by taking the new space-time weight value as the initial weight value W (1);
s7, a signal y (n) finally output in each iteration process is a useful signal subjected to anti-interference processing;
and S8, performing digital up-conversion on the anti-interference processed signal y (n), and converting the signal y (n) into an analog intermediate frequency signal through a digital-to-analog conversion module.
The invention also provides a receiver system, which comprises the Beidou third dual-mode self-adaptive anti-interference antenna, and further comprises a navigation processing module, a signal receiving module and a power module, wherein the power module is connected with the navigation processing module, the signal receiving module is connected with the navigation processing module and transmits received satellite signals to the navigation processing module for processing, the navigation processing module comprises a main processing unit, a positioning unit, an anti-interference unit, an interface unit and a human-computer interaction unit, the main processing unit is respectively connected with the positioning unit, the interface unit and the human-computer interaction unit, and the positioning unit adopts a Beidou/GPS dual-system positioning unit and is connected with the signal receiving module through the anti-interference unit.
In this embodiment, preferably, the navigation processing module includes an adaptive anti-interference filter, a baseband signal processor, and a central processing unit; the self-adaptive anti-interference filter carries out interference filtering processing on the output digital intermediate frequency signal to generate a filtering signal; the baseband signal processor receives the filtered signal; the filtering signal is distributed and configured by the satellite channels, each satellite channel executes acquisition, tracking and text demodulation, and a signal-to-noise ratio estimation signal processing algorithm through the cooperation of a software program executed by the central processing unit and the baseband signal processor.
In this embodiment, preferably, the power module adopts a main power supply and standby power supply mode, the power module is powered by a 220V ac power supply or a 24V dc power supply, and the power module processes an input power supply and outputs a stable dc power supply to supply power to the navigation processing module.
The principle and the advantages of the invention are as follows: according to the antenna, the antenna module is used for transmitting radio-frequency signals, and the anti-interference module is used for performing anti-interference processing on the radio-frequency signals output by the antenna module, so that the anti-interference capability of the antenna is improved, and the safety and accuracy of signal transmission are improved; the interference detection module, the radio frequency front-end module, the branch selection switch, the anti-interference processing module, the switching module, the main channel and the auxiliary channel are arranged on the anti-interference module, so that interference signals can be detected and judged, when interference does not exist or is small, down-conversion processing of other receiving channels is closed, the anti-interference module is closed, and the receiving channels are directly switched to a normal operation state, so that power consumption is greatly reduced; the receiver adopts GPS satellite positioning and Beidou system positioning, and autonomously adopts GPS navigation positioning in a combined positioning mode, so that the positioning precision is improved, not only can the Beidou satellite positioning be carried out, but also the GPS positioning and dual-system combined positioning can be carried out, and the accuracy of signal receiving is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a No. three bimodulus self-adaptation anti-interference antenna of big dipper which characterized in that: the antenna module is used for transmitting radio frequency signals, and the anti-interference module is used for performing anti-interference processing on the radio frequency signals output by the antenna module;
the antenna module comprises a microstrip antenna module, a dual-frequency equal power distributor and a microwave band-pass filter;
the microstrip antenna module comprises a microstrip antenna, the microstrip antenna is formed by attaching a conductor thin sheet on a dielectric substrate with a conductor ground plate, and the microstrip antenna is used for exciting a radio frequency electromagnetic field between the conductor patch and the ground plate by utilizing microstrip or coaxial line feeding and radiating outwards through a gap between the patch and the ground plate;
the double-frequency equal power divider is used for dividing two frequencies of the same feeding point into equal power;
the microwave band-pass filter is used for realizing double-frequency circular polarization through the same feed point, so that a plurality of frequencies are separated and enter different channels;
the anti-interference module comprises an interference detection module, a radio frequency front-end module, a branch selection switch, an anti-interference processing module, a switching module, a main channel and an auxiliary channel.
2. The Beidou third dual-mode self-adaptive anti-interference antenna according to claim 1, characterized in that: the main channel is a receiving channel of one group of signals, the auxiliary channel is a signal receiving channel except one group of signals, and an AD (analog-to-digital) converter and a DA (digital-to-analog) converter are arranged in the main channel and the auxiliary channel.
3. The Beidou No. three dual-mode adaptive anti-interference antenna according to claim 2, characterized in that: the input end of the branch selection switch is respectively connected with the AD analog-to-digital converter of the main channel and one output end of the interference detection module, one output end of the branch selection switch is connected with the anti-interference processing module, the other output end of the branch selection switch is connected with the main channel and the DA analog-to-digital converter of the auxiliary channel, the input end of the anti-interference processing module is also respectively connected with the AD analog-to-digital converter output end of the auxiliary channel, and the output end of the anti-interference processing module is connected with the main channel and the DA analog-to-digital converter of the auxiliary channel.
4. The Beidou third dual-mode self-adaptive anti-interference antenna according to claim 1, characterized in that: the switching module comprises power supply switches which are arranged in parallel and correspond to the auxiliary channels in number, and controlled ends of the power supply switches are respectively connected with the output end of the interference detection module.
5. The Beidou No. three dual-mode adaptive anti-interference antenna according to claim 1, characterized in that: the attenuation calculation formula from the interference source in the anti-interference module to the aperture surface of the antenna to be tested is as follows:
L2 i ＝R i +L l -G 0
wherein, L2 i For attenuation of interference sources to the aperture plane of the antenna under test, R i For receiving the power value, L, transmitted by the spectrum analyzer 1 For cable losses between antenna and spectrum analyzer, G 0 Is the antenna gain.
6. The Beidou three-mode self-adaptive anti-interference antenna and receiver system according to claim 5, characterized in that: the anti-interference capability in the anti-interference module is calculated by the following formula:
T i ＝P r +L2 i
(J/S) dB ＝T i -L2 i -(-130dBm)
wherein, T i For transmitting power, P, to the interference source r And presetting a power value of the interface of the antenna to be measured, wherein J represents interference signal power, and S represents satellite signal power.
7. The Beidou No. three dual-mode adaptive anti-interference antenna according to claim 3, characterized in that: the anti-interference processing method in the anti-interference module comprises the following steps:
s1, intermediate frequency signal sampling: receiving N paths of analog intermediate frequency signals from a radio frequency front end module through an AD (analog-to-digital) converter and a DA (digital-to-analog) converter, carrying out quantization processing on the received analog intermediate frequency signals, and outputting N paths of digital intermediate frequency signals;
s2, carrying out digital band-pass filtering and digital down-conversion processing on N paths of digital intermediate-frequency signals output by the AD analog-to-digital converter and the DA digital-to-analog converter to convert the signals into N paths of baseband complex signals;
s3, inputting the N baseband complex signals into a digital delay line, and combining all tap data to form a space-time vector signal X st ＝[x 11 ,x 12 ,L,x 1M ,x 21 ,x 22 ,L,x 2M ,L,x N1 ,x N2 ,L x NM ]Wherein M is the number of taps;
s4, block processing is carried out on the space-time vector signal data of each p snapshots, and an autocorrelation matrix is calculated:
Figure FDA0003795971300000031
wherein p is the number of beats [.] H Representing a conjugate transpose matrix; x st (k) A space-time vector signal of the kth snapshot;
s5, carrying out space-time weight W according to the following formula st ＝[w st11 ,w st12 ,L,w stNM ]Solving:
Figure FDA0003795971300000032
wherein R is st -1 R obtained for S4 st The inverse matrix of (d); a is st In the form of a space-time steering vector,
Figure FDA0003795971300000033
in the formula
Figure FDA0003795971300000034
The product of the Kronecker is expressed,
Figure FDA0003795971300000035
is a space-domain guide vector, and the space-domain guide vector,
Figure FDA0003795971300000036
n＝1,2,…,N；[x n ,y n ,z n ]is the spatial coordinate of the antenna array T-element n [ ·] T Is transposed, i is dot multiplied, θ is summed
Figure FDA0003795971300000037
Elevation and azimuth of the spatial signal, respectively; a is t ＝[1,0…0]The vector is a time domain guide vector, and the length of the vector is M;
s6, calculating the obtained space-time weight W st ＝[w st11 ,w st12 ,L,w stNM ]As an initial weight W (1) of CNLMS iteration, iteration is performed by the following formula:
W(1)＝[w st11 ,w st12 ,…w stNM ]
P 0 ＝I-a st (a st H *ast) -1 a st
S＝a st (a st H *a st ) -1
y(n)＝W(n) H X st (n),n＝1,2,…
W(n+1)＝P 0 (W(n)-μX st (n)y(n) * /(X st (n) H X st (n)))-S,n＝1,2,…
wherein, W (1) is an initial weight; y (n) is the beamformed output signal; μ is the iteration step size, μ<1；P 0 S is a from st A determined constant;
the iteration is continuously carried out until the space-time weight values obtained by the block processing of S4 and S4 are updated, the iteration of the current round is finished, and the next round of iteration is started by taking the new space-time weight value as the initial weight value W (1);
s7, a signal y (n) finally output in each iteration process is a useful signal subjected to anti-interference processing;
and S8, performing digital up-conversion on the anti-interference processed signal y (n), and converting the signal y (n) into an analog intermediate frequency signal through a digital-to-analog conversion module.
8. A receiver system, characterized by: the Beidou No. three dual-mode self-adaptive anti-interference antenna comprises the Beidou No. three dual-mode self-adaptive anti-interference antenna, and further comprises a navigation processing module, a signal receiving module and a power module, wherein the power module is connected with the navigation processing module, the signal receiving module is connected with the navigation processing module and transmits received satellite signals to the navigation processing module for processing, the navigation processing module comprises a main processing unit, a positioning unit, an anti-interference unit, an interface unit and a human-computer interaction unit, the main processing unit is respectively connected with the positioning unit, the interface unit and the human-computer interaction unit, and the positioning unit adopts a Beidou/GPS dual-system positioning unit and is connected with the signal receiving module through the anti-interference unit.
9. A receiver system according to claim 8, wherein: the navigation processing module comprises a self-adaptive anti-interference filter, a baseband signal processor and a central processing unit; the self-adaptive anti-interference filter carries out interference filtering processing on the output digital intermediate frequency signal to generate a filtering signal; the baseband signal processor receives the filtered signal; the filtering signal is distributed and configured by the satellite channels, each satellite channel executes acquisition, tracking and text demodulation, and a signal-to-noise ratio estimation signal processing algorithm through the cooperation of a software program executed by the central processing unit and the baseband signal processor.
10. A receiver system according to claim 8, wherein: the power module adopts a main power supply and standby power supply mode, the power module is powered by a 220V alternating current power supply or a 24V direct current power supply, and the power module processes an input power supply and outputs a stable direct current power supply to supply power for the navigation processing module.
CN202210975213.0A 2022-08-12 2022-08-12 Beidou third-model dual-mode self-adaptive anti-interference antenna and receiver system Pending CN115453575A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115856951A (en) * 2023-02-22 2023-03-28 北京凯芯微科技有限公司 Dual-mode frequency domain anti-interference circuit, baseband chip and navigation receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115856951A (en) * 2023-02-22 2023-03-28 北京凯芯微科技有限公司 Dual-mode frequency domain anti-interference circuit, baseband chip and navigation receiver

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