CN113721273A - Double-antenna Beidou portable monitoring terminal device - Google Patents
Double-antenna Beidou portable monitoring terminal device Download PDFInfo
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- CN113721273A CN113721273A CN202110852234.9A CN202110852234A CN113721273A CN 113721273 A CN113721273 A CN 113721273A CN 202110852234 A CN202110852234 A CN 202110852234A CN 113721273 A CN113721273 A CN 113721273A
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/36—Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a double-antenna Beidou portable monitoring terminal device which comprises double antennas, a radio frequency module and a baseband processing module, wherein the radio frequency module is connected with the double antennas; the dual antenna comprises a 2-array-element antenna array, the radio frequency module comprises 4 paths of amplitude limiters and radio frequency channels, and the baseband processing module comprises an anti-interference processing module, a navigation processing module and a power supply module; the anti-interference processing module comprises an anti-interference processing module interface unit, a clock distribution unit, an ADC unit, an FPGA unit and a power supply unit. The two satellite antennas are separately placed, signals received by the two antennas are combined and then sent to the satellite navigation receiver, and the transmitting antennas are switched according to beam information received by each antenna. The invention can ensure the timeliness of signal switching, improve the success rate and simultaneously have the anti-interference function.
Description
Technical Field
The invention relates to the technical field of Beidou communication, in particular to a double-antenna Beidou portable monitoring terminal device.
Background
The beidou satellite navigation system has provided a lot of communication and positioning services for users. The Beidou portable terminal is widely applied to industries such as security protection, fire protection and the like. At present, a single antenna is influenced by a surrounding complex environment or has a signal shielding problem caused by direction change, so that signal loss occurs. In order to solve these problems, it is proposed that,
the invention provides a double-antenna Beidou portable monitoring terminal device which can well solve the problem of signal shielding caused by changing the advancing direction of a single antenna.
Disclosure of Invention
The invention aims to provide a double-antenna Beidou portable monitoring terminal device, which is characterized in that through arranging a double antenna, a radio frequency module and a baseband processing module, the two antennas are separately placed, signals received by the two antennas are combined and then sent to a satellite navigation receiver, and the transmitting antennas are switched according to beam information received by each antenna, so that the timeliness of signal switching can be ensured, the success rate is improved, and meanwhile, the double-antenna Beidou portable monitoring terminal device has an anti-interference function.
The purpose of the invention can be realized by the following technical scheme:
a dual-antenna Beidou portable monitoring terminal device comprises dual antennas, a radio frequency module and a baseband processing module, wherein the radio frequency module is respectively connected with the dual antennas and the baseband processing module;
the double antennas are used for realizing positioning and receiving satellite navigation signals;
the radio frequency module is used for satellite navigation signals, sequentially carrying out signal amplification, down-conversion, amplification and filtering and forming intermediate frequency signals;
and the baseband processing module performs signal sampling and adaptive space-time filtering processing on the generated intermediate frequency signal.
As a further scheme of the invention: the double antenna is a 2-array element antenna array.
As a further scheme of the invention: the dual-antenna is connected with the terminal main control extension through a wire, and the terminal main control extension is connected to the flat plate in a wired or wireless communication mode.
As a further scheme of the invention: the connection between the double antennas and the terminal main control extension is more than 6 meters, and the double antennas are symmetrically distributed on the mounting bracket.
As a further scheme of the invention: the radio frequency module comprises 4 paths of amplitude limiters and radio frequency channels and adopts a one-time down-conversion structure.
As a further scheme of the invention: the baseband processing module comprises an anti-interference processing module, a navigation processing module and a power supply module;
the anti-interference processing module consists of an interface unit, a clock distribution unit, an ADC unit, an FPGA unit and a power supply unit;
the interface unit comprises 4 paths of intermediate frequency analog signal input interfaces, 1 path of ADC sampling clock input interface and 422 serial port communication interface;
the clock distribution unit is used for providing sampling clocks for 1 ADC chip and 1 FPGA chip;
the ADC unit consists of 1 chip of 4-channel ADC and a matching circuit of 4 paths of intermediate frequency analog signals;
the FPGA unit is used for performing digital down-conversion, low-pass filtering and storage on the intermediate-frequency digital signals output by the channel ADC;
the power supply unit is used for providing voltage required by the intermediate frequency anti-interference module.
As a further scheme of the invention: the 4-channel ADC receives 4 paths of intermediate frequency signals, converts the analog intermediate frequency signals into intermediate frequency digital signals according to a sampling clock provided by the clock distribution unit, and the sampling bit number of each path of intermediate frequency signals is 14 bits.
As a further scheme of the invention: the FPGA unit integrates the obtained baseband data, then performs combined space-frequency domain filtering by using the weight of the filter, and transmits the baseband data output by filtering to the baseband receiver module.
As a further scheme of the invention: the FPGA chip is ZYNQ7020 type.
As a further scheme of the invention: the ADC chip is AD9253 type.
The invention has the beneficial effects that:
(1) according to the invention, by arranging the double antennas, the radio frequency module and the baseband processing module, the two antennas are separately arranged, namely symmetrically distributed on the mounting bracket, signals received by the two antennas are combined and then sent to the satellite navigation receiver, and the transmitting antennas are switched according to beam information received by each antenna, so that the timeliness of signal switching can be ensured, the success rate is improved, and meanwhile, the anti-interference function is realized;
(2) the MEMS sensor is integrated in the anti-interference antenna, satellite signals of double antennas are simultaneously accessed to a navigation receiver, the receiver selects a beam with higher signal-to-noise ratio as a main beam, a beam with lower signal-to-noise ratio as a secondary beam, the antenna corresponding to the main beam is a main antenna, and the antenna corresponding to the secondary beam is a secondary antenna; and transforming the coordinate information output by the MEMS of the anti-interference antenna and the coordinate information of the satellite to the same coordinate system, and compensating the beam satellite signal with poor signal-to-noise ratio of the main antenna after coordinate transformation so as to improve the positioning precision.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an anti-interference receiver set according to the present invention;
FIG. 2 is a schematic diagram of the structure of the radio frequency signal flow chart of the present invention;
fig. 3 is a schematic structural diagram of the anti-interference module in 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 is a dual-antenna big dipper portable monitoring terminal device, wherein the radio frequency module is respectively connected to a dual antenna and a baseband processing module, the dual antenna is used for positioning and receiving satellite navigation signals, the radio frequency module is used for the satellite navigation signals, sequentially performing signal amplification, down conversion, amplification and filtering, and forming intermediate frequency signals, and the baseband processing module performs signal sampling and adaptive space-time filtering processing on the generated intermediate frequency signals.
Specifically, the dual antenna is a 2-element antenna array, that is, two antennas at a B3 frequency point and two antennas at an S frequency point.
The dual-antenna terminal is characterized in that the dual-antenna terminal is connected with the terminal main control extension through a wire, the terminal main control extension is connected to the flat plate in a wired or wireless communication mode, the connection between the dual-antenna terminal and the terminal main control extension is larger than 6 meters, and the dual-antenna terminal is symmetrically distributed on the mounting support.
When the satellite navigation receiver is used, the two antennas are placed separately, signals received by the two antennas are combined and then sent to the satellite navigation receiver, and transmitting antenna switching is carried out according to beam information received by each antenna, so that the timeliness of signal switching can be ensured, and the success rate is improved.
Specifically, the radio frequency module comprises 4 paths of amplitude limiters and radio frequency channels, namely 2 paths of B3 frequency points and 2 paths of S frequency points;
as shown in fig. 2, four identical radio frequency channels in the radio frequency module complete functions of low noise amplification, down conversion, amplification and filtering of B3 and S satellite navigation signals, and output B3 and S intermediate frequency signals to the intermediate frequency processing module;
the radio frequency channel adopts a primary down-conversion structure, the selection of a frequency scheme firstly considers that combined frequency interference, intermodulation and intermodulation interference are not generated, a frequency multiplication phase-locked loop works in an integer frequency division mode to reduce phase noise, the passband characteristic of a radio frequency module is mainly realized by putting at the intermediate frequency of 46.52MHz, and a surface acoustic wave band-pass filter is adopted.
Specifically, the baseband processing module comprises an anti-interference processing module, a navigation processing module and a power supply module;
the anti-interference processing module consists of an interface unit, a clock distribution unit, an ADC unit, an FPGA unit and a power supply unit;
the interface unit comprises 4 paths of intermediate frequency analog signal input interfaces, 1 path of ADC sampling clock input interface and 422 serial port communication interface;
the clock distribution unit is used for providing sampling clocks for 1 ADC chip and 1 FPGA chip;
the ADC unit consists of 1 chip of 4-channel ADC and a matching circuit of 4 paths of intermediate frequency analog signals, wherein the 4-channel ADC receives the 4 paths of intermediate frequency signals, converts the analog intermediate frequency signals into intermediate frequency digital signals according to a sampling clock provided by the clock distribution unit, and the sampling bit number of each path of intermediate frequency signals is 14 bits;
the FPGA unit is responsible for realizing key tasks of the intermediate-frequency anti-interference module, digital down-conversion, low-pass filtering and storage are carried out on intermediate-frequency digital signals output by the channel ADC, correlation value calculation is carried out on obtained baseband data, combined space-frequency domain filtering is carried out by using a filter weight, and the baseband data output by filtering is sent to the baseband receiver module.
The power supply unit is used for providing voltage required by the intermediate frequency anti-interference module.
As shown in fig. 3, the anti-interference processing module is implemented by an amplitude-phase error estimation and correction unit, a blockack ram storage unit, a down-conversion low-pass filtering unit, a statistical characteristic calculation unit, a space-time filtering weight calculation unit, a space-time adaptive filtering unit, and a digital AGC adjustment unit, where channel amplitude-phase errors are usually caused by jitter of clocks and devices of an antenna, a feeder line, a receiving channel, an acquisition channel, quantization errors of digital signals, thermal noise, etc., and a small amplitude-phase error affects interference null-notch depth and degrades anti-interference performance.
The FPGA chip is ZYNQ7020 type.
Wherein, the ADC chip is AD9253 model.
Specifically, an MEMS sensor is integrated in an anti-interference antenna, a dual-antenna satellite signal is simultaneously accessed to a navigation receiver, the receiver selects a beam with higher signal-to-noise ratio as a main beam, a beam with lower signal-to-noise ratio as a secondary beam, an antenna corresponding to the main beam is a main antenna, and an antenna corresponding to the secondary beam is a secondary antenna; and transforming the coordinate information output by the MEMS of the anti-interference antenna and the coordinate information of the satellite to the same coordinate system, and compensating the beam satellite signal with poor signal-to-noise ratio of the main antenna after coordinate transformation so as to improve the positioning precision.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A dual-antenna Beidou portable monitoring terminal device is characterized by comprising dual antennas, a radio frequency module and a baseband processing module, wherein the radio frequency module is respectively connected with the dual antennas and the baseband processing module;
the double antennas are used for realizing positioning and receiving satellite navigation signals;
the radio frequency module is used for satellite navigation signals, sequentially carrying out signal amplification, down-conversion, amplification and filtering and forming intermediate frequency signals;
and the baseband processing module performs signal sampling and adaptive space-time filtering processing on the generated intermediate frequency signal.
2. The portable Beidou portable monitoring terminal device with double antennas as set forth in claim 1, wherein the double antennas are 2-element antenna arrays.
3. The portable big dipper dual-antenna monitoring terminal device of claim 2, wherein said dual-antenna is connected to a terminal master control extension through a wire, said terminal master control extension is connected to a tablet.
4. The portable big dipper dual-antenna monitoring terminal device of claim 3, wherein said dual-antenna is connected to said terminal master control extension for more than 6 meters, and said dual-antenna is symmetrically distributed on said mounting bracket.
5. The portable big dipper dual-antenna monitoring terminal device of claim 1, wherein said rf module comprises 4 limiters and rf channels, and adopts a one-down conversion structure.
6. The dual-antenna Beidou portable monitoring terminal device according to claim 1, wherein the baseband processing module comprises an anti-interference processing module, a navigation processing module and a power supply module;
the anti-interference processing module consists of an interface unit, a clock distribution unit, an ADC unit, an FPGA unit and a power supply unit;
the interface unit comprises 4 paths of intermediate frequency analog signal input interfaces, 1 path of ADC sampling clock input interface and 422 serial port communication interface;
the clock distribution unit is used for providing sampling clocks for 1 ADC chip and 1 FPGA chip;
the ADC unit consists of 1 chip of 4-channel ADC and a matching circuit of 4 paths of intermediate frequency analog signals;
the FPGA unit is used for performing digital down-conversion, low-pass filtering and storage on the intermediate-frequency digital signals output by the channel ADC;
the power supply unit is used for providing voltage required by the intermediate frequency anti-interference module.
7. The dual-antenna Beidou portable monitoring terminal device according to claim 6, wherein the 4-channel ADC receives 4 paths of intermediate frequency signals, converts the analog intermediate frequency signals into intermediate frequency digital signals according to a sampling clock provided by the clock distribution unit, and the sampling bit number of each path of intermediate frequency signals is 14 bits.
8. The dual-antenna Beidou portable monitoring terminal device according to claim 6, wherein the FPGA unit integrates the obtained baseband data, and then performs combined space-frequency domain filtering by using the filter weight, and transmits the baseband data output by the filtering to the baseband receiver module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110852234.9A CN113721273A (en) | 2021-07-27 | 2021-07-27 | Double-antenna Beidou portable monitoring terminal device |
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| CN202110852234.9A CN113721273A (en) | 2021-07-27 | 2021-07-27 | Double-antenna Beidou portable monitoring terminal device |
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| CN113721273A true CN113721273A (en) | 2021-11-30 |
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2021
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