CN213026506U

CN213026506U - Small-size aviation anti-interference antenna of big dipper

Info

Publication number: CN213026506U
Application number: CN202022544251.XU
Authority: CN
Inventors: 沈利
Original assignee: Hubei Beidouxunda Technology Co ltd
Current assignee: Hubei Beidouxunda Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-04-20
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a big dipper small-size aviation anti-interference antenna, which comprises an antenna module and an anti-interference module; the antenna module comprises an antenna cavity, an antenna cover, 4 BDS2B3 arrays, 1 GPS L1 array, 5 array switching PCBs, 5 low-noise amplifier cover plates, 5 radio frequency coaxial cables and 5 radio frequency output connectors; the feed point of 1 GPS L1 array is welded on the input end of the transfer PCB of the array positioned at the most center; the feed points of 4 BDS2B3 arrays are respectively welded at the input ends of the switching PCBs of the remaining 4 arrays; the 5 array switching PCBs are connected with the 5 low-noise amplifier PCBs in a one-to-one mode through 5 radio frequency coaxial cables; the outer sides of the fixing surfaces of the 4 BDS2B3 elements are inclined towards the bottom surface of the antenna cavity; and the 5 low-noise amplifier PCBs output radio frequency signals to the anti-interference module through the 5 radio frequency output connectors. The utility model discloses a miniaturized airborne aviation that is suitable for of overall dimension, and better interference killing feature has.

Description

Small-size aviation anti-interference antenna of big dipper

Technical Field

The utility model relates to a small-size aviation anti-interference antenna of big dipper.

Background

The existing airborne GPS aerial antenna is basically monopolized by foreign products, does not support BDS2B3 navigation, can not realize anti-interference performance due to the fact that the interior of the aircraft is only purely imitated, and can not meet the trend of miniaturization and anti-interference even if the aircraft has an anti-interference function but also has the problem of overlarge product size.

SUMMERY OF THE UTILITY MODEL

Problem to prior art exists, the utility model provides a big dipper small-size aviation anti-interference antenna, the miniaturized airborne aviation that is suitable for of overall dimension, GPS navigation and BDS navigation that can realize the antenna simultaneously, and have better interference killing feature.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

a Beidou small aviation anti-interference antenna comprises an antenna module and an anti-interference module used for performing anti-interference processing on radio frequency signals output by the antenna module;

the antenna module includes: 1 antenna cavity, 1 radome, 4 BDS2B3 arrays, 1 GPS L1 array, 5 array switching PCBs, 5 low-noise amplifier PCBs, 5 radio frequency coaxial cables and 5 radio frequency output connectors; the antenna housing is fixed on the front surface of the antenna cavity;

3 array switching PCBs form a row and are arranged in the middle of the interior of the antenna cavity, and the other 2 array switching PCBs are respectively arranged on the left side and the right side of the interior of the antenna cavity; 2 low-noise-discharge PCBs are arranged between the array switching PCB in the middle row and the array switching PCBs on the left side and the right side; the PCB with 1 low noise amplifier is arranged below the array switching PCB at the center;

the feed point of the 1 GPS L1 array is welded at the input end of the array switching PCB positioned at the center; the feed points of the 4 BDS2B3 arrays are respectively welded at the input ends of the switching PCBs of the remaining 4 arrays; the 5 array switching PCBs are connected with the 5 low-noise amplifier PCBs in a one-to-one mode through the 5 radio frequency coaxial cables; the outer sides of the fixing surfaces of the 4 BDS2B3 elements are inclined towards the bottom surface of the antenna cavity;

and the 5 low-noise amplifier PCBs output radio frequency signals to the anti-interference module through the 5 radio frequency output connectors.

In a more preferable technical scheme, an inclined included angle formed between a fixing surface of each BDS2B3 array and the bottom surface of the antenna cavity is 22.5 degrees.

In a more preferable technical scheme, the radio frequency output connector of the antenna module is an SMA-KFD radio frequency connector.

In a more preferred technical scheme, the anti-interference module comprises an anti-interference module structure cavity, 4 radio frequency channel PCBs, 1 frequency synthesis PCB, 1 anti-interference processing PCB, 2 EMI power filters, a power socket, 5 radio frequency input connectors and 2 radio frequency output connectors;

the radio frequency channel PCB, the frequency synthesis PCB, the anti-interference processing PCB and the 2 EMI power filters are all arranged in the cavity of the anti-interference module structure; the radio frequency channel PCB and the anti-interference processing PCB are mutually matched by adopting an MCX-J/MCX-K connector opposite-inserting structure to realize that one cavity is arranged in the signal processing module cavity in multiple layers;

the power socket, 5 radio frequency input connectors and 2 radio frequency output connectors of the anti-interference module are all arranged on the side face of the cavity of the signal processing module.

In a more preferable technical scheme, the anti-interference module further comprises a frequency synthesis PCB cover plate, an anti-interference processing PCB cover plate and a radio frequency channel PCB cover plate; in the anti-interference module structure cavity, an anti-interference processing PCB is positioned on the upper layer of the radio frequency channel PCB, and the frequency synthesis PCB is positioned at a gap between the radio frequency channel PCB and the anti-interference processing PCB; the radio frequency channel PCB cover plate is arranged at the bottom of the anti-interference module structure cavity and used for protecting the radio frequency channel PCB; the anti-interference processing PCB cover plate is arranged at the top of the anti-interference module structure cavity and used for protecting the anti-interference processing PCB; the radio frequency channel PCB cover plate is arranged above the frequency synthesis PCB and used for protecting the frequency synthesis PCB.

In a more preferred technical scheme, the anti-interference module structure cavity, the anti-interference processing PCB cover plate and the radio frequency channel PCB cover plate are all made of aluminum alloy materials.

In a more preferable technical scheme, the radio frequency input connector of the anti-interference processing module adopts an SMA-KFD radio frequency connector.

In a more preferred technical solution, 2 rf output connectors of the anti-interference processing module: the 1 radio frequency output connector adopts a TNC-KFD radio frequency connector, is used for outputting low-power frequency modulation signals of BDS2B3 and GPS and is provided with 5V feed input; and the other 1 radio frequency output connector adopts an N-KFD radio frequency connector and is used for outputting high-power frequency modulation signals of the BDS2B3 and the GPS.

In a more preferable technical scheme, the anti-interference processing PCB comprises an AD converter, an FPGA, a DA converter and an ARM processor, wherein the input end of the AD converter is connected with the radio frequency channel PCB, the output end of the AD converter and the input end of the DA converter are both connected with the FPGA, and the output end of the DA converter is connected with the frequency synthesis PCB; the ARM processor is connected with the FPGA and the frequency integrated PCB and used for controlling the direct connection and locking modes of the radio frequency channel.

In a more preferred technical scheme, a serial port is arranged on the cavity of the anti-interference module structure, is connected with a serial port of the ARM processor, and is used for anti-interference processing of PCB output self-detection and interference detection results.

Advantageous effects

Compared with the prior art, the utility model discloses an anti-interference antenna is carried to bullet has following technological effect:

1. the BDS2B3 array with 4 array elements is adopted, and the capability of resisting 3-direction suppression interference is achieved;

2. the outer sides of the fixed surfaces of the 4 BDS2B3 arrays are inclined towards the bottom surface of the antenna cavity, and form an inclined included angle of 22.5 degrees with the bottom surface of the antenna cavity, so that mutual coupling among the antenna arrays can be reduced;

3. the system can receive frequency point radio frequency signals and GPS L1 frequency point radio frequency signals and output 2 paths of GNSS signals subjected to anti-interference processing, namely B3+ GPS low-power radio frequency signals and B3+ GPS high-power radio frequency signals;

4. the anti-interference module adopts a structure that one-cavity multi-layer MCX-J/MCX-K connectors are inserted in opposite directions to be matched with each other, so that the radio-frequency-free cable assembly on the structure is realized, the volume and the weight of the structure are greatly reduced, the internal space utilization is realized to the maximum extent, and simultaneously, a large amount of material cost and assembly cost are saved;

5. the anti-interference module adopts an ARM processor, and a serial port is led out through the ARM processor, so that the results of self detection and interference detection of the anti-interference processing PCB can be output, and the control of an upper computer is facilitated;

6. the radio frequency input connector and the radio frequency output connector of the antenna module and the anti-interference module have a short circuit protection function, so that the anti-burnout capability is realized.

Drawings

FIG. 1 is a schematic diagram of a Beidou small aviation anti-jamming antenna according to the embodiment;

fig. 2 is a bottom external view of the antenna module according to the present embodiment;

fig. 3 is a top view of the antenna cavity of the present embodiment;

fig. 4 is a right side view of the antenna cavity of the present embodiment;

fig. 5 is a front view of the antenna cavity of the present embodiment;

fig. 6 is a perspective external view of the anti-jamming module according to the present embodiment;

fig. 7 is a schematic diagram of a one-cavity multi-layer MCX-J/MCX-K connector plug-in structure of the anti-jamming module according to this embodiment.

The figures are numbered: 11-1: BDS2B3 element, 11-2: GPS L1 oscillator, 12: array switching PCB, 13: low noise PCB, 14: radio frequency coaxial cable, 21: anti-interference modular structure cavity, 22: radio frequency channel PCB, 23: radio frequency channel PCB cover, 24: anti-interference processing PCB, 25: tamper resistant PCB cover, 26: frequency synthesizer PCB, 27: frequency heald PCB cover plate.

Detailed Description

This embodiment uses the utility model discloses a technical scheme develops as the foundation, has given detailed implementation and specific operation process, and is right the utility model discloses a technical scheme further explains.

The circuit schematic diagram of the small-size aviation anti-interference antenna for the big dipper is shown in fig. 1, and the small-size aviation anti-interference antenna for the big dipper comprises an antenna module and an anti-interference module for performing anti-interference processing on a radio-frequency signal output by the antenna module.

As shown in fig. 2 to 5, the antenna module includes: 1 antenna cavity, 1 antenna housing, 4 BDS2B3 array 11-1, 1 GPS L1 array 11-2, 5 array switching PCBs 12, 5 low-noise amplifier PCBs 13, 5 low-noise amplifier cover plates, 5 radio frequency coaxial cables 14 and 5 radio frequency output connectors; the antenna housing is fixed on the front surface of the antenna cavity, and the 5 low-noise amplifier cover plates are respectively arranged above the 5 low-noise amplifier PCBs;

the feed point of the 1 GPS L1 array is welded at the input end of the transfer PCB of the array positioned at the most center; the feed points of the 4 BDS2B3 arrays are respectively welded at the input ends of the remaining 4 array switching PCBs; the 5 array switching PCBs are connected with the 5 low-noise amplifier PCBs in a one-to-one mode through the 5 radio frequency coaxial cables; the outer sides of the fixing surfaces of the 4 BDS2B3 arrays are inclined towards the bottom surface of the antenna cavity, and the inclined included angle formed between the fixing surface of each BDS2B3 array and the bottom surface of the antenna cavity is 22.5 degrees;

the definition of the radio frequency output interfaces of the 5 low-noise amplifier PCBs is shown in Table 1, and radio frequency signals are output to the anti-interference module through the 5 SMA-KFD radio frequency connectors respectively.

TABLE 1 antenna Module interface

Serial number	Name (R)	Description of the invention
			1	RF_out1	BDS channel 1 radio frequency output
2	RF_out2	BDS channel				2 radio frequency output
			3	RF_out3	BDS channel 3 radio frequency output
4	RF_out4	BDS channel 4 radio frequency output
			5	RF_out5	GPS channel radio frequency output

As shown in fig. 6-7, the anti-jamming module includes an anti-jamming module structure cavity 21, 4 rf channels PCB22, 1 frequency synthesizer PCB26, 1 anti-jamming processing PCB24, 2 EMI power filters, a power socket, 5 rf input connectors, 2 rf output connectors, a frequency synthesizer PCB cover plate 27, an anti-jamming processing PCB cover plate 25, and an rf channels PCB cover plate 23;

the radio frequency channel PCB, the frequency synthesis PCB, the anti-interference processing PCB and the 2 EMI power filters are all arranged in a cavity of the anti-interference module structure, the anti-interference processing PCB is positioned on the upper layer of the radio frequency channel PCB, and the frequency synthesis PCB is positioned in a gap between the radio frequency channel PCB and the anti-interference processing PCB; the radio frequency channel PCB and the anti-interference processing PCB are mutually matched by adopting an MCX-J/MCX-K connector opposite-inserting structure to realize that one cavity is arranged in the signal processing module cavity in multiple layers; the radio frequency channel PCB cover plate is arranged at the bottom of the anti-interference module structure cavity and used for protecting the radio frequency channel PCB; the anti-interference processing PCB cover plate is arranged at the top of the anti-interference module structure cavity and used for protecting the anti-interference processing PCB; the radio frequency channel PCB cover plate is arranged above the frequency synthesis PCB and used for protecting the frequency synthesis PCB. The anti-interference module structure cavity, the anti-interference processing PCB cover plate and the radio frequency channel PCB cover plate are all made of aluminum alloy materials.

The power socket, 5 radio frequency input connectors and 2 radio frequency output connectors of the anti-interference module are all arranged on the side face of the cavity of the signal processing module. The 5 radio frequency input connectors also adopt SMA-KFD radio frequency connectors, and correspond to the SMA-KFD radio frequency connectors used by the antenna module for outputting radio frequency signals so as to receive the radio frequency signals from the antenna module; and 2 radio frequency output connectors, wherein 1 radio frequency output connector adopts a TNC-KFD radio frequency connector and is used for outputting low-power frequency modulation signals of the BDS2B3 and the GPS and is provided with a 5V feed input, and the other 1 radio frequency output connector adopts an N-KFD radio frequency connector and is used for outputting high-power frequency modulation signals of the BDS2B3 and the GPS. The power socket adopts J599, has a data interface, and can output anti-interference signal number, intensity and position signal through anti-interference processing PCB.

The 5 rf input connectors, 2 rf output connections, 1 power outlet of the anti-jamming module are respectively used for the interfaces defined in table 2 below:

TABLE 2 anti-interference Module interface definitions

The anti-interference processing PCB comprises an AD converter, an FPGA, a DA converter and an ARM processor, wherein the input end of the AD converter is connected with a radio frequency channel PCB, the output end of the AD converter and the input end of the DA converter are both connected with the FPGA, and the output end of the DA converter is connected with a frequency synthesis PCB; the ARM processor is connected with the FPGA and the frequency integrated PCB and used for controlling the direct connection and locking modes of the radio frequency channel.

Still set up the serial port on the anti-interference module structure cavity, including UART, RS232 and RS422, be connected with the corresponding port of ARM treater for anti-interference processing PCB outputs self-checking and interference detection result.

The radio frequency channel PCB in the embodiment comprises a down-conversion circuit, a power amplifier PA and an intermediate frequency filter BPF; the frequency synthesis PCB comprises a local oscillator, an intermediate frequency filter, an up-conversion circuit and an ARM singlechip.

The BDS2B3 array antenna with 4 array elements in the antenna module receives 4 paths of BDS2B3 frequency point radio frequency signals, and the radio frequency signals are subjected to low-noise amplification and then output to the anti-interference module through the radio frequency output connector; a radio frequency channel PCB in the anti-interference module performs SAW (surface acoustic wave) filtering, down-conversion, power amplification and intermediate frequency filtering on the received radio frequency signal, converts the radio frequency signal into an intermediate frequency signal and outputs the intermediate frequency signal to the anti-interference processing PCB; the 4 paths of B3 array intermediate frequency signals are subjected to ADC digital-to-analog conversion in an anti-interference processing PCB, then the array anti-interference signal processing is completed in the FPGA, and the anti-interference processed intermediate frequency analog signals are output through DAC analog-to-digital conversion; after receiving the intermediate-frequency analog signal subjected to the anti-interference processing from the anti-interference processing PCB, the frequency synthesizer PCB performs up-conversion to a BDS2B3 frequency point, and combines with the GPS radio-frequency signal to perform power division output. ARM on the anti-interference processing PCB controls the direct connection and locking mode through the IO pin: b3 signals and GPS L1 signals which are subjected to anti-interference processing are output during normal work; directly outputting a B3 channel 4 signal and a GPS L1 signal during direct connection; when the lock is closed, the power supply of the radio frequency circuit is closed, and no output exists.

The power supply in the anti-interference module is provided with an EMI filter, power supply protection, DC-DC conversion and a radio frequency power supply; the serial port is connected to the ARM processor, and the ARM processor can control the update of the working data of the whole machine, the output of interference information, the debugging control of the whole machine and the like.

It should be noted that the utility model discloses require the integrated configuration mode between each module, the low noise that involves in the concrete module is put, the sound table filtering, down conversion, power amplification, intermediate frequency filtering, ADC, FPGA is anti-interference, DAC, the way merit of combining divides, direct and processing technology means such as locking mode control all belong to prior art, the utility model discloses no longer specifically explain.

The above embodiments are preferred embodiments of the present application, and those skilled in the art can make various changes or modifications without departing from the general concept of the present application, and such changes or modifications should fall within the scope of the claims of the present application.

Claims

1. The Beidou small aviation anti-interference antenna is characterized by comprising an antenna module and an anti-interference module for performing anti-interference processing on a radio frequency signal output by the antenna module;

2. The Beidou small aviation anti-jamming antenna according to claim 1, wherein the inclined angle formed between the fixed surface of each BDS2B3 array and the bottom surface of the antenna cavity is 22.5 degrees.

3. The Beidou small-sized aviation anti-interference antenna according to claim 1, characterized in that the radio frequency output connector of the antenna module is an SMA-KFD radio frequency connector.

4. The Beidou small-sized aviation anti-jamming antenna according to claim 1, wherein the anti-jamming module comprises an anti-jamming module structure cavity, 4 radio frequency channel PCBs, 1 frequency synthesizer PCB, 1 anti-jamming processing PCB, 2 EMI power filters, a power socket, 5 radio frequency input connectors and 2 radio frequency output connectors;

5. The Beidou small-sized aviation anti-jamming antenna according to claim 4, characterized in that the anti-jamming module further comprises a frequency synthesizer PCB cover plate, an anti-jamming processing PCB cover plate and a radio frequency channel PCB cover plate; in the anti-interference module structure cavity, an anti-interference processing PCB is positioned on the upper layer of the radio frequency channel PCB, and the frequency synthesis PCB is positioned at a gap between the radio frequency channel PCB and the anti-interference processing PCB; the radio frequency channel PCB cover plate is arranged at the bottom of the anti-interference module structure cavity and used for protecting the radio frequency channel PCB; the anti-interference processing PCB cover plate is arranged at the top of the anti-interference module structure cavity and used for protecting the anti-interference processing PCB; the radio frequency channel PCB cover plate is arranged above the frequency synthesis PCB and used for protecting the frequency synthesis PCB.

6. The Beidou small-sized aviation anti-interference antenna according to claim 5, wherein the anti-interference module structure cavity, the anti-interference processing PCB cover plate and the radio frequency channel PCB cover plate are all made of aluminum alloy materials.

7. The Beidou small-sized aviation anti-interference antenna according to claim 4, wherein the radio frequency input connector of the anti-interference processing module is an SMA-KFD radio frequency connector.

8. The small-sized Beidou aviation anti-jamming antenna according to claim 4, characterized in that 2 radio frequency output connectors of the anti-jamming processing module: the 1 radio frequency output connector adopts a TNC-KFD radio frequency connector, is used for outputting low-power frequency modulation signals of BDS2B3 and GPS and is provided with 5V feed input; and the other 1 radio frequency output connector adopts an N-KFD radio frequency connector and is used for outputting high-power frequency modulation signals of the BDS2B3 and the GPS.

9. The Beidou small-sized aviation anti-interference antenna according to claim 4, wherein the anti-interference processing PCB comprises an AD converter, an FPGA, a DA converter and an ARM processor, wherein the input end of the AD converter is connected with the radio frequency channel PCB, the output end of the AD converter and the input end of the DA converter are both connected with the FPGA, and the output end of the DA converter is connected with the frequency integrated PCB; the ARM processor is connected with the FPGA and the frequency integrated PCB and used for controlling the direct connection and locking modes of the radio frequency channel.

10. The Beidou small-sized aviation anti-jamming antenna according to claim 9, wherein a serial port is arranged on the anti-jamming module structure cavity, connected with a serial port of the ARM processor, and used for anti-jamming processing of PCB output self-detection and jamming detection results.