CN117437822A - Interference suppression subsystem - Google Patents
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- CN117437822A CN117437822A CN202311549078.4A CN202311549078A CN117437822A CN 117437822 A CN117437822 A CN 117437822A CN 202311549078 A CN202311549078 A CN 202311549078A CN 117437822 A CN117437822 A CN 117437822A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
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Abstract
The invention relates to the technical field of graphic data reading, in particular to an interference suppression subsystem, which comprises a first display control terminal, a multichannel embedded software radio platform, a multichannel microwave down-converter and an array antenna. Meanwhile, the array antenna receives the target interference signal. The multichannel microwave down converter carries out multichannel microwave down conversion on the target interference signal and then transmits the target interference signal to the multichannel embedded software radio platform. Finally, the multichannel embedded software radio platform performs spatial filtering on the target interference signal based on the parameters of the preset interference suppression scheme, and solves the problem that the conventional environment does not have electromagnetic interference condition conditions, so that training cannot be performed.
Description
Technical Field
The invention relates to the technical field of graphic data reading, in particular to an interference suppression subsystem.
Background
The training tasks normally carried out by command staff, technical analysts and equipment control are specifically.
Firstly, control the measurement and control equipment to track and capture the target training, including under the electromagnetic interference condition, control the measurement and control equipment to capture and track the measurement and control signal, falsely lock and recapture and other training.
And secondly, interference signal direction finding analysis training, such as training of monitoring/identifying/direction finding/analyzing the interference signal when the operation and control task is interfered.
And thirdly, performing interference signal avoidance treatment training, namely performing interference signal avoidance training, treatment training and the like for preventing equipment from being damaged or guaranteeing the execution of a measurement and operation task under the electromagnetic interference condition.
And fourthly, the organizational command training of interference response comprises the organizational command training of each level of commander for interference under the electromagnetic interference condition.
However, the conventional environment does not have electromagnetic interference condition conditions, so that training cannot be performed.
Disclosure of Invention
The invention aims to provide an interference suppression subsystem, which aims to solve the problem that the conventional environment does not have electromagnetic interference condition conditions and therefore cannot be used for training.
In order to achieve the above purpose, the invention provides an interference suppression subsystem, which comprises a first display control terminal, a multichannel embedded software radio platform, a multichannel microwave down converter and an array antenna, wherein the first display control terminal, the multichannel embedded software radio platform, the multichannel microwave down converter and the array antenna are connected in sequence. The first display control terminal is used for editing a preset interference suppression scheme on line and sending parameters of the preset interference suppression scheme to the multichannel embedded software radio platform. The array antenna is used for receiving the target interference signal. The multichannel microwave down converter is used for carrying out multichannel microwave down conversion on the target interference signal and then transmitting the target interference signal to the multichannel embedded software radio platform. The multichannel embedded software radio platform performs spatial filtering on the target interference signal based on the parameters of the preset interference suppression scheme.
The interference suppression subsystem further comprises a first data transmission antenna module, a second data transmission antenna module and a second display control terminal, and the multichannel embedded software radio platform, the first data transmission antenna module, the second data transmission antenna module and the second display control terminal are sequentially connected. The second data transmission antenna module is used for remotely operating the second display control terminal to edit a preset interference suppression scheme on line and send parameters of the preset interference suppression scheme to the first data transmission antenna module. The first data transmission antenna module is configured to send parameters of the preset interference suppression scheme to the multichannel embedded software radio platform.
The first data transmission antenna module comprises a first data transmission module and a first data transmission antenna, the second data transmission antenna module comprises a second data transmission module and a second data transmission antenna, and the multichannel embedded software radio platform, the first data transmission module, the first data transmission antenna, the second data transmission module and the second display control terminal are sequentially connected.
Wherein, the spatial filtering adopts DBF technology.
The multichannel embedded software radio platform comprises a wireless radio frequency signal receiving and transmitting module and a rear-end digital processing module, and the wireless radio frequency signal receiving and transmitting module is connected with the rear-end digital processing module. The wireless radio frequency signal receiving and transmitting module is used for receiving parameters of the preset interference suppression scheme. And the back-end digital processing module performs spatial filtering on the target interference signal by adopting a DBF technology based on the parameters of the preset interference suppression scheme. The interference suppression subsystem further comprises a portable battery box, and the portable battery box is connected with the first display control terminal, the multichannel embedded software radio platform, the multichannel microwave down converter and the first data transmission antenna module. The portable battery box is used for supplying power to the first display control terminal, the multichannel embedded software radio platform, the multichannel microwave down converter and the first data transmission antenna module.
According to the interference suppression subsystem, firstly, the first display control terminal edits a preset interference suppression scheme on line and sends parameters of the preset interference suppression scheme to the multichannel embedded software radio platform. Meanwhile, the array antenna receives a target interference signal. And the multichannel microwave down converter carries out multichannel microwave down conversion on the target interference signal and then transmits the target interference signal to the multichannel embedded software radio platform. Finally, the multichannel embedded software radio platform performs spatial filtering on the target interference signal based on the parameters of the preset interference suppression scheme, so that the problem that training cannot be performed because the conventional environment does not have electromagnetic interference condition conditions is solved.
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 functional block diagram of an interference suppression subsystem provided by the present invention.
Fig. 2 is the external appearance of the multichannel embedded software radio platform (right side is the effect after mounting the housing).
Fig. 3 is a schematic diagram of the internal structure of a multichannel embedded software radio platform.
Fig. 4 is a schematic diagram of a multi-channel embedded software radio platform backplane interface illustration.
Fig. 5 is a block diagram of an ADRV9009 chip.
FIG. 6 is a block diagram of an XC7Z100-2FFG900I chip.
Fig. 7 is a schematic diagram of a primary power interface.
Fig. 8 is a schematic diagram of a fan interface.
FIG. 9 is a schematic diagram of a PL clock circuit.
Fig. 10 is a schematic diagram of a PS clock circuit.
Fig. 11 is a schematic diagram of a clock circuit pin definition.
Fig. 12 is a schematic view of a J30J connector.
Fig. 13 is a schematic diagram of a multi-channel microwave down converter.
Fig. 14 is a functional block diagram of a multi-channel microwave down-converter.
Fig. 15 is a schematic diagram of a single channel link of a multi-channel microwave down-converter.
Fig. 16 is a schematic diagram of the appearance of a direction-finding antenna array.
Fig. 17 shows a principle of a direction-finding antenna array (L indicates 6 to 18GHz antenna elements, and H indicates 18 to 40GHz antenna elements).
Fig. 18 is a schematic diagram of a data transmission module and a stick antenna.
Fig. 19 is a schematic diagram of the hardware framework of a data transfer module (dual channel embedded software radio platform module).
Fig. 20 is a workflow of an interferer subsystem.
The wireless communication system comprises a 1-first display control terminal, a 2-multichannel embedded software radio platform, a 3-multichannel microwave down converter, a 4-array antenna, a 5-second display control terminal, a 6-first data transmission module, a 7-first data transmission antenna, an 8-second data transmission module, a 9-second data transmission antenna and a 10-portable battery box.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 20, the present invention provides an interference suppression subsystem, which includes a first display control terminal 1, a multi-channel embedded software radio platform 2, a multi-channel microwave down-converter 3 and an array antenna 4, wherein the first display control terminal 1, the multi-channel embedded software radio platform 2, the multi-channel microwave down-converter 3 and the array antenna 4 are sequentially connected.
The first display control terminal 1 is configured to edit a preset interference suppression scheme on line, and send parameters of the preset interference suppression scheme to the multichannel embedded software radio platform 2.
The array antenna 4 is configured to receive a target interference signal.
The multichannel microwave down converter 3 is configured to perform multichannel microwave down conversion on the target interference signal and transmit the target interference signal to the multichannel embedded software radio platform 2.
The multichannel embedded software radio platform 2 performs spatial filtering on the target interference signal based on the parameters of the preset interference suppression scheme.
Specifically, first, the first display control terminal 1 edits a preset interference suppression scheme online, and sends parameters of the preset interference suppression scheme to the multichannel embedded software radio platform 2. At the same time, the array antenna 4 receives a target interference signal. The multichannel microwave down converter 3 performs multichannel microwave down conversion on the target interference signal and then transmits the target interference signal to the multichannel embedded software radio platform 2. Finally, the multichannel embedded software radio platform 2 performs spatial filtering on the target interference signal based on the parameters of the preset interference suppression scheme, so that the problem that training cannot be performed because the conventional environment does not have electromagnetic interference condition conditions is solved.
Further, the interference suppression subsystem further comprises a first data transmission antenna 7 module, a second data transmission antenna 8 module and a second display control terminal 5, and the multichannel embedded software radio platform 2, the first data transmission antenna 7 module, the second data transmission antenna 8 module and the second display control terminal 5 are sequentially connected.
The second data transmission antenna 8 module is configured to remotely operate the second display control terminal 5 to edit a preset interference suppression scheme online, and send parameters of the preset interference suppression scheme to the first data transmission antenna 7 module.
The first data transmission antenna 7 module is configured to send parameters of the preset interference suppression scheme to the multichannel embedded software radio platform 2.
The first data transmission antenna 7 module comprises a first data transmission module 6 and a first data transmission antenna 7, the second data transmission antenna 8 module comprises a second data transmission module 8 and a second data transmission antenna 8, and the multichannel embedded software radio platform 2, the first data transmission module 6, the first data transmission antenna 7, the second data transmission antenna 8, the second data transmission module 8 and the second display control terminal 5 are sequentially connected.
Further, the multichannel embedded software radio platform 2 comprises a wireless radio frequency signal receiving and transmitting module and a back-end digital processing module, and the wireless radio frequency signal receiving and transmitting module is connected with the back-end digital processing module.
The wireless radio frequency signal receiving and transmitting module is used for receiving parameters of the preset interference suppression scheme.
And the back-end digital processing module performs spatial filtering on the target interference signal by adopting a DBF technology based on the parameters of the preset interference suppression scheme.
Further, the interference suppression subsystem further comprises a portable battery box 9, and the portable battery box 9 is connected with the first display control terminal 1, the multichannel embedded software radio platform 2, the multichannel microwave down converter 3 and the first data transmission antenna 7.
The portable battery box 9 is configured to supply power to the first display control terminal 1, the multichannel embedded software radio platform 2, the multichannel microwave down converter 3, and the first data transmission antenna 7.
Further, the first display control terminal comprises a display module and an editing module, and the display module is connected with the editing module.
The editing module is used for editing a preset interference suppression scheme on line and sending parameters of the preset interference suppression scheme to the multichannel embedded software radio platform.
The display module is used for displaying the working process of the editing module.
The display module comprises a display sub-module and an audio sub-module,
the display sub-module is used for displaying the working process of the editing module.
The audio sub-module is used for playing the sound effect of the working process of the editing module.
The display module further comprises a measuring sub-module and a brightness adjusting sub-module.
The measuring sub-module is used for measuring the current ambient illumination intensity.
And the brightness adjustment sub-module is used for adjusting the current display brightness of the display sub-module based on the current ambient illumination intensity.
The display module further comprises a noise measuring sub-module and a volume adjusting sub-module.
The noise measuring sub-module is used for measuring current environmental noise.
And the volume adjusting sub-module is used for adjusting the current playing volume of the audio sub-module based on the current environmental noise.
The present invention provides an interference suppression subsystem term: frequency tolerance: the maximum allowable deviation of the transmitted characteristic frequency from the reference frequency is expressed as a few parts per million x 10-6 or a few Hz.
Reference frequency: frequencies having fixed and specific positions relative to the assigned frequency.
Assigning frequencies: a center frequency assigned to a radio transmitting device frequency band.
Peak package power: the transmitter provides an arithmetic average of the power supplied to the antenna feed during one radio frequency period of the peak of the modulation envelope.
A radio frequency preprocessor: an electrically controlled radio frequency conditioning device connected between the antenna and the monitoring receiving device, capable of configuring a plurality of radio frequency channels,
such as through channel, attenuation channel, various filtering channels, switching channels by electrically controlled switch to extend radio monitoring system dynamics
The range is increased, the monitoring sensitivity is improved, and the interference caused by strong signals is overcome.
Protection ratio: a receiver input terminal determined under a specified condition in order to make the useful signal of the receiver output terminal reach a specified receiving quality.
The minimum ratio of useful signal to unwanted signal is typically expressed in decibels.
Digital receiver: and after the signals are digitized by the A/D, the digital signal processing technology is used for realizing frequency conversion, filtering and demodulation.
Abbreviations: ADMUA: analog and digital modulation recognition algorithms analog and digital modulation recognition algorithms.
a/D: analog to digital, analog-to-digital conversion.
AF: antenna factor.
AFC: automatic frequency control, automatic frequency control.
AGC: automatic gain control, automatic gain control.
ANT: antenna, antenna.
ANN: artificial neural network, artificial neural network.
AOA: angle of arrival.
CAL: calization, calibration.
Com. Complex modulation, complex modulation.
D/A: digital-to-analog, digital-to-analog conversion.
DOA: direction of arrival, direction of arrival.
EMI: electromagnetic Interference, electromagnetic interference.
EMS: electromagnetic Susceptibility, electromagnetic sensitivity.
MMIC: microwave Monolithic Integrated Circuit, a microwave integrated circuit.
NAV: navigation.
Rx: and (5) receiving.
TOA: time of Arrival, time reached.
The functions are as follows: single-tone, multi-tone interference can be identified and suppressed.
The signal modulation recognition type is not limited to CW, ASK, FSK, MPSK, OQPSK, 16QAM, etc.
Narrowband (amplitude modulation, frequency modulation, BPSK, QPSK, etc. patterns) interference can be identified and suppressed.
The method has various technical modes (amplitude comparison method, correlation interferometer method and spatial spectrum method) for acquiring the incoming wave direction of the interference signal.
IQ data recording and playback of target signals are supported, SPF+tera-fiber ports are provided, and IQ data high-speed transmission is supported.
The baseband digital signal processing technology is adopted, so that spatial domain notch suppression can be carried out on interference signals in different incoming wave directions.
The device has an external communication function and can be controlled through a network.
The health monitoring system has a health management function and can be used for health monitoring of equipment states.
Performance: operating frequency: 6 GHz-40 GHz.
Frequency resolution: < 1kHz.
Measuring dynamic range: 130dB.
Level measurement error: less than or equal to + -3 dB.
Interference suppression's interference rejection limit: more than or equal to 25dB (single tone interference).
More than or equal to 20dB (multitone interference).
Loss of signal processing after single-tone interference suppression: less than or equal to 2dB.
Interference suppression processing bandwidth: 20 kHz-5 MHz.
Interference processing time delay: and less than or equal to 100ms.
Internal spurious signals: and less than or equal to-110 dBm (reduced to the input end and in a conventional mode).
Burn-out resistant input power: less than or equal to 27dBm.
Intermediate frequency suppression: and more than or equal to 90dB.
Image frequency suppression: and more than or equal to 90dB.
Operating temperature: -25-45 ℃.
And (3) battery power supply: the battery endurance working time is not less than 3 hours.
Battery charge time: not more than 6 hours.
The guarantee is as follows: the system is provided with a portable transport case and an installation tool, realizes a single person moving function, and can be transported by an automobile or a train.
Testability: the system has a health management function (namely a BIT function in the system), and can perform health monitoring on the states of all devices in the subsystem and record alarm information.
Safety: when the staff performs operation, maintenance, repair or adjustment on the interference source subsystem, electromagnetic radiation is not performed to the staff.
Reliability: the mean time between failures MTBF is more than or equal to 5000h.
Maintainability: the average repair time MTTR is less than or equal to 1h.
Environmental suitability: has the functions of rain protection and dust prevention of IP43 level and good heat dissipation.
Electromagnetic compatibility: the self-compatibility requirement is met, and other devices are not caused to malfunction and generate impermissible responses.
Working principle: the interference suppression subsystem uses the array antenna 4 technology and the multichannel digital receiver design technology to acquire the incoming wave direction and signal characteristic information of an interference signal, and simultaneously adopts the Digital Beam Forming (DBF) technology to carry out self-adaptive beam control on the received signal in the incoming wave direction of the interference signal in the digital domain, and forms a receiving zero point (namely the gain of the array antenna 4 is the lowest in the place) in the incoming wave direction of the interference signal, so that the external interference signal can be effectively suppressed.
Digital Beam Forming (DBF) is a new technology established with the development of digital signal processing methods, which not only can fully retain information collected on the array antenna 4, but also can process the information using complex digital signal processing methods. Digital beamforming techniques have many advantages over common analog beamforming techniques, such as ultra-low resolution, ultra-low side lobes, immunity to electronic interference, scanning speed, multi-target processing, high performance parallel digital processing, etc.
The interference suppression subsystem mainly comprises hardware such as an interference detection module, an interference identification module, an interference suppression module, an FPGA, a power supply, a clock, a storage module and the like. And the single-tone, multi-tone and narrow-band interference modulation recognition and suppression are realized, and the signal meets the equipment demodulation requirement by reducing the interference-to-signal ratio. Wherein the interference detection, identification and suppression are integrated inside the multichannel embedded software radio platform 2.
The commander, the technical analyst, the equipment operator and other staff can edit, modify and implement the preset interference suppression scheme on line at the display control terminal, and can remotely operate the display control terminal to edit, modify and implement the preset interference suppression scheme through the data transmission module and the antenna.
The commander, the technical analyst, the equipment operator and other staff send a plurality of parameters in the selected interference suppression scheme to the multichannel embedded software radio platform 2 through the upper computer software, after receiving the target interference signal, the array antenna 4 enters the multichannel embedded software radio platform 2 after down-conversion by multichannel microwaves, and the DBF technology is adopted to perform airspace filtering on the interference signal while identifying the interference signal.
And (3) hardware design: 1 multichannel embedded software radio platform 2: the core hardware of the interference suppression subsystem for identifying the interfering signals and forming spatial filtering is the multi-channel embedded software radio platform 2.
1.1 appearance: the multichannel embedded software radio platform 2 is shown in the external appearance in fig. 2.
1.2 principle: the multichannel embedded software radio platform 2 is an embedded, miniaturized, multichannel software radio platform developed for various wireless communication product developments, communication teaching. The platform consists of two parts, one part is a wireless radio frequency signal receiving and transmitting module based on ADRV9009 chip development of ADI company, and the other part is a back-end digital processing module based on Zynq7100 chip development of Xilinx company.
The platform is a high-performance and highly-integrated wireless radio frequency signal receiving and transmitting processing device, and is suitable for wireless communication teaching aid development, miniaturized spectrum detection, broadband signal generator, wireless point direction finding positioning development and other works.
a) ADRV9009 chip: ADRV9009 is a high performance, high integration Radio Frequency (RF) Agile Transceiver for 5G base station, radar applications TM Agile transceivers. The programmability and broadband capabilities of the device make it an ideal choice for a variety of transceiver applications. The device integrates an RF front end with a flexible mixed signal baseband section, integrates a frequency synthesizer, and provides a configurable digital interface for a processor, thereby simplifying design importation.
With dual receivers.
The dual input shared observation receiver.
Maximum receiver bandwidth: 200MHz.
Maximum tunable transmitter composite bandwidth: 450MHz.
Maximum observed receiver bandwidth: 450MHz.
JESD204B datapath interface.
Tuning range: 75 MHz-6 GHz.
b) XC7Z100-2FFG900I: the board card uses Zynq7000 series chips of Xilinx company, and the model is XC7Z100-2FFG900I. The PS system of the chip integrates two ARM Cortex TM -an A9 processor configured to perform,interconnect, internal memory, external memory interface, and peripherals. These peripherals mainly include USB bus interfaces, ethernet interfaces, SD/SDIO interfaces, I2C bus interfaces, CAN bus interfaces, UART interfaces, GPIO, and the like. The PS may operate independently and start up on power up or reset.
c) Main power interface: the main power supply adopts +12V to supply power, the maximum allowable input voltage is 14V, the theoretical peak power consumption of the board can reach 80W, and the 12V10A power supply is recommended to supply power. The main power interface type is a 6 pin XH2.54 interface.
d) A fan interface: the board outputs one path of 5.5V power supply to supply power to the fan, and the fan is additionally arranged when the board is used to radiate heat well, otherwise, the risk of burning exists.
e) PL clock: the on-board 200MHz clock chip provides a clock for the PL terminal, and the clock signal is a differential clock and has a standard LVDS level.
f) PS clock: the on-board 33.333333MHz clock chip provides a clock for the PS end, and the clock signal is a single-ended clock and has a level standard LVCMOS33.
g) PSDDR3: the board PS end is mounted with a 1GB DDR3 chip, the model is MT41K256M16-RE125, the bit width is 32 bits, the chip is mounted on a BANK 502 of the 7100 chip, the BANK is a fixed BANK with the DDR mounted on the PS end, and pins are not listed in detail.
h) PL DDR3: the PL end of the board card is provided with a 1GB DDR3 chip, the model is MT41K256M16-RE125, the bit width is 32 bits, and the board card is arranged on the BANK33 and the BANK34 of the 7100 chip.
i) FLASH: the board card board carries 64MB QSPI FLASH and consists of a double-path S25FL256 SAGFAI 00 chip.
j) Gigabit ethernet interface: the card is provided with a standard RJ45 gigabit Ethernet interface, the PHY chip model is 88E1116R, and the RJ45 port is provided with a network transformer, so that the network connectivity among different network devices is ensured.
k) USB: the card is provided with a USB2.0 interface, the type of the physical interface is USB mini, and the USB interface chip is TUSB1210. When TUSB1210 is operating in different modes, its REFCLK pin needs to be connected to ground or an external 26MHz reference clock, and the board card switches with a 1.27mm three-pin and a 1.27mm jumper cap.
l) serial port: the board card is provided with a serial port, is converted into a USB interface in the board, and is of a USB mini interface type, and can be directly connected with a computer through an adapter wire. The serial port conversion chip model used by the board card is CP2103GM.
o) clock synchronization circuit: an AD9528 on board is used for clock synchronization of the plurality of pieces 9009.
Clock input: the AD9528 clock is an on-board 122.88MHz clock crystal oscillator and is connected to pins 11 and 12 of the AD9528 through a matching network.
Control signal: the FPGA completes AD9528 control through an SPI interface and other IO ports.
And (3) clock output: AD9528 has a total of 14 clock outputs.
n) optical port (SFP interface): and an SFP interface is carried on the board, the optical port high-speed interface is connected to a GTX channel 0 of the 7100BANK112, and a clock channel 1 on the BANK is used as a reference clock and is connected with a 156.25MHz crystal oscillator.
m) J30J connector: with a J30J-15TJW-J connector with pins connected to the PL BANK12 pins, the BANK is 2.5V voltage power BANK, the pins connected by the connector can be customized to any supported 2.5V voltage level standard, and 4 pairs of pins can be used as LVDS pairs: 2/9, 3/10, 6/4, 13/12.
Performance: an interface: network port, optical port, serial port, USB, TF card, PL I/O port and JTAG.
On-board PSDDR3 1GB and PL DDR3 1GB.
On-board 64MB QSPI FLASH.
SD card slot: the Linux operating system may be running.
Flash and SD card switching: the start-up can be started from Flash or from SD card.
A radio frequency channel: 8, 8 times of receiving.
Transmission power: max 0dBm.
The radio frequency working range is as follows: 75 MHz-6 GHz.
Bandwidth: 200MHz.
Sampling rate: up to 245.76MSPS.
2 multichannel microwave down converter 3: the multichannel microwave down converter 3 is used for converting an interference signal of 6-40 GHz into a signal below 6GHz, and is used for signal detection, identification and suppression of the multichannel embedded software radio platform 2.
2.1 the appearance is shown in fig. 13.
2.2 principle: a schematic block diagram of the multi-channel microwave down-converter 3 is shown in fig. 14.
The internal constituent blocks of the multi-channel microwave down-converter 3 are shown in the following table.
Table 1 a list of internal constituent modules of the multichannel microwave down-converter 3.
The single channel link of the multi-channel microwave down-converter 3 is shown in fig. 15.
Wherein: the main function of the switch filtering amplification is to firstly limit amplitude of the received radio frequency signal to prevent the high-power signal from burning out the receiving module, amplify the small signal, then segment the received radio frequency signal to filter out harmonic wave and clutter for subsequent signal transmission and processing. The main technical index requirements are as follows: 1) Operating frequency: 6-40 GHz.
2) Maximum input power: the linear input power ranges from-130 dBm to 0dBm, and the burning-resistant power is more than 1W.
3) Clip level: 12dBm.
4) Gain: the maximum gain of the small signal is 35dB, and the maximum gain of the large signal is-30 dB.
5) Harmonic suppression: 50dBc.
6) Clutter suppression: 50dBc.
7) P-1 output power: 10dBm.
The primary function of the first mixing is to convert the received radio frequency signal to 22GHz. The main technical index requirements are as follows: 1) Operating frequency: inputting 6-40 GHz and outputting 22GHz +/-80 MHz.
2) Local oscillation frequency: 22.03 GHz-40.0 GHz, step by 1MHz.
3) Local oscillation power: 5dBm.
4) Clutter suppression: 50dBc.
5) Gain: 40dB.
6) P-1 output power: 10dBm.
The primary function of the second mixing is to frequency convert the first frequency converted 22GHz signal to 1.2GHz. The main technical index requirements are as follows: 1) Operating frequency: 22GHz + -80 MHz is input, and 1.2GHz + -80 MHz is output.
2) Local oscillation frequency: 20.8GHz.
3) Local oscillation power: 5dBm.
4) Clutter suppression: 50dBc.
5) Gain: 40dB.
6) 1dB compression point output power: 13dBm.
2.3 Properties: operating frequency: 6 GHz-40 GHz.
Real-time signal bandwidth: 80MHz.
Reception level range: 134-0 dBm (bandwidth 10 Hz).
Measuring dynamic range: and more than or equal to 130dB.
Level measurement error: less than or equal to + -3 dB.
Bandwidth measurement accuracy: less than or equal to 5% BW (BW is signal bandwidth).
Interference suppression's interference rejection limit: more than or equal to 25dB (single tone interference).
More than or equal to 20dB (multitone interference).
Loss of signal processing after single-tone interference suppression: less than or equal to 2dB.
Interference suppression processing bandwidth: 20 kHz-5 MHz.
Interference processing time delay: and less than or equal to 100ms.
Signal scan speed: 100GHz/s (25 kHz step).
Internal spurious signals: and less than or equal to-110 dBm (converted into the normal mode of the input end).
Burn-out resistant input power: less than or equal to 27dBm.
Intermediate frequency suppression: and more than or equal to 90dB.
Image frequency suppression: and more than or equal to 90dB.
While providing a plurality of downconverter channels.
Meeting the coherent requirements of the multi-channel down-conversion channel.
The multi-channel parameter calibration system has the advantages that the calibration source module is arranged, and multi-channel parameter calibration work can be conveniently and timely carried out.
The clock and the local oscillation circuit are built in, and the participation of external time signals is supported.
3 array antenna 4:3.1 the appearance is shown in fig. 16, the left is a schematic structural diagram, and the right is a schematic internal structural diagram.
The 3.2 principle is shown in figure 17.
2.3 Properties: 1) Operating frequency: 6 GHz-40 GHz.
2) Number of antenna elements: 8 (6-18 GHz) and 8 (18-40 GHz).
3) Polarization mode: and vertically polarizing.
4) Antenna form: the half power wave beam of the horn antenna with constant wave speed is more than or equal to 45 degrees.
5) Antenna gain: typical values are not less than 8dBi.
6) Amplitude consistency: less than or equal to 2dB.
7) Phase stability: less than or equal to 3 degrees.
8) Voltage standing wave ratio: typical values are less than or equal to 1.5.
9) Pitch angle: typical values are not less than 45 deg..
d) Omni-directional monitoring antenna technical parameters: 1) Operating frequency: 6-40 GHz.
2) Gain in horizontal direction: typical values are not less than 0dBi.
3) Standing wave ratio: typical values are less than or equal to 2.5.
4, a first data transmission antenna module: 4.1 appearance: the data transmission module hardware selects mature goods shelf products-the double-channel embedded software radio platform module, and the data transmission antenna selects the rubber rod antenna. As shown in fig. 18.
4.2 hardware: the hardware framework of the data transfer module (dual channel embedded software radio platform module) is shown in fig. 19.
Wherein: 1) ZYNQ7020: the main control unit of the recording module has the functions of FPGA and ARM processing, and the functions of signal acquisition, wireless communication baseband signal processing and external interface communication are realized.
2) eMMC: data storage is carried out, the standard is configured to be 8G, and the standard can be configured to be 16GB.
3) Flash: the device system initializes the configuration.
4) AD9361: and carrying out wireless communication with the master control.
5) Radio frequency front-end circuit: and configuring a power amplifier and a low-noise amplifier to realize a wireless communication distance of not less than 300 m.
6) Beidou/GPS module: and realizing module time synchronization and information time labels.
7) An interface part: including power ports, network interfaces, serial ports, etc.
4.3 communication: a) Physical layer design: in order to ensure the communication reliability, the physical layer adopts direct sequence spread spectrum to communicate. The method has the characteristics of high sensitivity, low transmitting power, reliable communication and the like.
Modulation mode: bpsk+ spread spectrum.
Rate of: not lower than 1Mbps.
Band bandwidth: 2MHz.
Communication frequency: the frequency point between 700MHz and 2GHz is adjustable.
Transmitting power: the power of 20 dBm-30 dBm is adjustable.
A low noise amplifier: 20dBm.
Communication distance: not less than 500 m.
b) Carrier access (MAC) and networking (network) designs: MAC: and adopting a TDMA access mode to communicate.
NET: the network adopts a star network.
4.4 function: a) Self-checking function: after the hardware is running, self-test can be performed on the hardware. The self-checking work is checked as follows: 1) The current charge of the rechargeable, detachable lithium battery.
2) Whether the wireless communication channel link is operating properly.
3) Memory and the size of the space of the memory.
b) Wireless communication function: and the transmission rate of the information interaction of the similar modules is not lower than 1Mbps. The communication distance is not less than 500 meters. Not only broadcast communication but also one-to-one communication can be implemented.
c) Task data storage function: the memory of the module is selected from 512G SSD hard disk, DRAM memory or eMMC memory, and the memory capacity can be 16GB.
4.3 workflow: the general workflow of the interference suppression subsystem is shown in fig. 20.
The foregoing disclosure is illustrative of a preferred embodiment of an interference suppression subsystem according to the present invention, and it is not intended to limit the scope of the invention in any way, as a person of ordinary skill in the art will understand that all or part of the procedures described in the embodiments can be performed and that equivalent variations according to the claims of the present invention are still within the scope of the invention.
Claims (6)
1. An interference suppression subsystem, characterized in that,
the multi-channel microwave down converter comprises a first display control terminal, a multi-channel embedded software radio platform, a multi-channel microwave down converter and an array antenna, wherein the first display control terminal, the multi-channel embedded software radio platform, the multi-channel microwave down converter and the array antenna are sequentially connected.
The first display control terminal is used for editing a preset interference suppression scheme on line and sending parameters of the preset interference suppression scheme to the multichannel embedded software radio platform.
The array antenna is used for receiving the target interference signal.
The multichannel microwave down converter is used for carrying out multichannel microwave down conversion on the target interference signal and then transmitting the target interference signal to the multichannel embedded software radio platform.
The multichannel embedded software radio platform performs spatial filtering on the target interference signal based on the parameters of the preset interference suppression scheme.
2. The interference suppression subsystem of claim 1, wherein,
the interference suppression subsystem further comprises a first data transmission antenna module, a second data transmission antenna module and a second display control terminal, and the multichannel embedded software radio platform, the first data transmission antenna module, the second data transmission antenna module and the second display control terminal are sequentially connected.
The second data transmission antenna module is used for remotely operating the second display control terminal to edit a preset interference suppression scheme on line and send parameters of the preset interference suppression scheme to the first data transmission antenna module.
The first data transmission antenna module is configured to send parameters of the preset interference suppression scheme to the multichannel embedded software radio platform.
3. The interference suppression subsystem of claim 2, wherein,
the first data transmission antenna module comprises a first data transmission module and a first data transmission antenna, the second data transmission antenna module comprises a second data transmission module and a second data transmission antenna, and the multichannel embedded software radio platform, the first data transmission module, the first data transmission antenna, the second data transmission module and the second display control terminal are sequentially connected.
4. The interference suppression subsystem of claim 1, wherein,
the spatial filtering is performed by adopting a DBF technology.
5. The interference suppression subsystem of claim 4,
the multichannel embedded software radio platform comprises a wireless radio frequency signal receiving and transmitting module and a rear-end digital processing module, and the wireless radio frequency signal receiving and transmitting module is connected with the rear-end digital processing module.
The wireless radio frequency signal receiving and transmitting module is used for receiving parameters of the preset interference suppression scheme.
And the back-end digital processing module performs spatial filtering on the target interference signal by adopting a DBF technology based on the parameters of the preset interference suppression scheme.
6. The interference suppression subsystem of claim 2, wherein,
the interference suppression subsystem further comprises a portable battery box, and the portable battery box is connected with the first display control terminal, the multichannel embedded software radio platform, the multichannel microwave down converter and the first data transmission antenna module.
The portable battery box is used for supplying power to the first display control terminal, the multichannel embedded software radio platform, the multichannel microwave down converter and the first data transmission antenna module.
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