CN104717026B - A kind of anti-interference single channel direction finding processing unit and method - Google Patents
A kind of anti-interference single channel direction finding processing unit and method Download PDFInfo
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Abstract
The present invention proposes a kind of anti-interference single channel direction finding processing unit, including radiofrequency signal interception system, direction finding IF process system and terminal；Direction finding IF process system passes through network settings radiofrequency signal interception system, the radio wave signal of VHF/UHF frequency ranges in radiofrequency signal interception system capturing ambient, and the radio signal that will be intercepted is converted to analog if signal output to direction finding IF process system, direction finding IF process system is converted to the analog if signal for receiving and carry out after digital medium-frequency signal digital down-converted generation data base-band signal, and is sent to the terminal after carrying out direction finding anti-interference process to data base-band signal.Terminal is sent in intermediate frequency control instruction input direction finding IF process system, the data base-band signal loopback terminal that direction finding IF process system will have been processed.Present invention also offers corresponding anti-interference single channel direction finding processing method.
Description
Technical field
The present invention relates to the real-time direction finding Treatment Analysis of data, at the anti-interference single channel direction finding more particularly to based on FPGA
Reason.
Background technology
Direction finding data processing and collection are one of important technology difficulty of measurement direction-finding system precision.Exhausted big portion on the market
Divide the validity and real-time of direction finding processor gathered data data cannot be guaranteed, therefore cause direction-finding system stabilization and direction finding system
System precision does not reach Foreign Advanced Lerel always.It is relatively wide in the application of the aspect such as radionavigation and radio detection, military, sports
Can all apply.
Direction-finding equipment is typically made up of four parts, i.e., direction-finder antenna (battle array), direction-finding signal preprocessor, direction-finding receiver and
Direction finding terminating machine.Present direction-finding receiver and direction finding terminating machine use computer master control direction-finder set controlled mode mostly, it is impossible to complete
Into two-way communication and connection, it is impossible to effective anti-direction finding interference and error, cause direction finding precision to improve and be relatively difficult to ensure card.
The content of the invention
To ensure system acquisition data stability, for follow-up direction finding analysis provides important authentic data, greatly reduce data
The bit error rate, improves the direction finding degree of accuracy and stability, and the present invention proposes a kind of anti-interference single channel direction finding processing unit and method,
Technical scheme is as follows：
A kind of anti-interference single channel direction finding processing unit, including radiofrequency signal interception system, direction finding IF process system with
And terminal；It is characterized in that radiofrequency signal interception system is connected with direction finding IF process system, and to direction finding intermediate frequency at
Reason system exports analog if signal, and direction finding IF process system is bi-directionally connected with terminal.
Direction finding IF process system is by radiofrequency signal interception system described in network settings, the capture of radiofrequency signal interception system
The radio wave signal of VHF/UHF frequency ranges in environment, and the radio signal that will be intercepted is converted to analog if signal output
To the direction finding IF process system, the analog if signal for receiving is converted to digital intermediate frequency letter by direction finding IF process system
Digital down-converted generation data base-band signal is carried out after number, and biography after direction finding anti-interference process is carried out to data base-band signal
It is sent to the terminal.Terminal is sent in intermediate frequency control instruction input direction finding IF process system, direction finding intermediate frequency
The data base-band signal loopback terminal that processing system will have been processed.
The standalone feature system that direction finding IF process system is realized for field programmable gate array, including Digital Down Convert mould
Block, direction finding immunity module, data memory module, data outputting module；Digital Down Converter Module output end is anti-interference with direction finding
Module input is connected, and direction finding immunity module output end connects data memory module and data outputting module respectively, and data are deposited
Storage module is connected with data outputting module.
The digital medium-frequency signal that Digital Down Converter Module will be received is converted into data base-band signal, and exports anti-to direction finding
Interference module, carries out data analysis direction finding and rejects interference signal, and treated direction finding data are deposited into data memory module, and
By data outputting module direction finding data transfer to terminal.
Radiofrequency signal interception system is connected with direction finding IF process system by DB25 interfaces.
Radiofrequency signal interception system output analog if signal is input into direction finding IF process system by SMA interfaces.
Direction finding IF process system is connected with the terminal by pci interface.
A kind of anti-interference single channel direction finding processing method, it is characterised in that comprise the following steps：
S1：The radio wave signal of VHF/UHF frequency ranges is converted to analog if signal in capturing ambient；
S2：By data acquisition board, analog if signal is transformed to digital medium-frequency signal, and digital medium-frequency signal is entered
Line number word down-converted, generates data base-band signal；
S3：Direction finding anti-interference process is carried out to data base-band signal, direction-finding signal is gathered；
S4：Send direction finding data to terminal.
Further, Digital Down Convert treatment comprises the following steps described in step S2：
S21：Amount of bandwidth to signal is encoded, and different bandwidth number is formed, by look-up table to digital medium-frequency signal
Carry out data mixing；
S22：Row wide-narrow filtering is entered to different bandwidth signal according to the instruction of host computer network interface, data base-band signal is generated；
S23：Data base-band signal needed for selecting system to export by multichannel data.
Yet further, width filtering comprises the following steps described in step S22：
S221：Bandwidth number is read according to host computer instruction, if 0 ~ 1, then carry out parallel 256 rank finite impulse response (FIR) broadband
Filtering, filter range is 40M ~ 20M, and continues to judge downwards, if not then reading bandwidth number directly down；
S222：The signal after S221 steps is read, if bandwidth number is 2 ~ 8, serial 128 rank finite impulse response (FIR) is carried out wide
Band filtering, filter range is 5M ~ 1M, and continues to judge downwards, if not then reading bandwidth number directly down；
S223：Frequency deviation adjustment is carried out to the signal after S222 steps；
S224：The signal after S223 steps is read, if bandwidth number is 10 ~ 16, serial 128 rank finite impulse response (FIR) is carried out
Narrow-band filtering, filter range is 500K ~ 150K, and continues to judge downwards, if not then reading bandwidth number directly down；
S225：The signal after S224 steps is read, if bandwidth number is 18 ~ 32, serial 128 rank finite impulse response (FIR) is carried out
Narrow-band filtering, filter range is 120K ~ 1K, and enters multichannel data selection system, if not being then directly entered multichannel data choosing
Select system.
Treatment described in step S3 comprises the following steps：
S31：Send Handshake Protocol signal and obtain communication with antenna control board；If not succeeding, start-up study retransmission mechanism,
If retransmitting all no successes for continuous 10 times, type of error code is sent to host computer, inform personnel inspection circuit connection and anti-interference list
Passage direction finding processing unit；
S32：The antenna that needs are got through is encoded（0~N）With residence time parameter setting；
S33：Start day line traffic control trigger signal；
S34：Whether the current group antenna i of inquiry gets through successfully；If not getting through, trigger signal is retransmitted, if continuous retransmission 5 times
Trigger signal antenna cannot be got through, and an error flag code is sent to host computer, and teaching process personnel overhaul this group of antenna just
Whether terminal damages；
S35：If this group of antenna i gets through successfully, enter line delay debounce, collection direction finding data are not shaken.
S36：According to host computer instruction acquisition set point number direction finding data.
S37：Direction finding data to collecting are ranked up, rejecting abnormalities direction finding data value.
S38：After the completion of anti-interference process, in the direction finding data to data memory module of output antenna i.
S39：Judge 0≤i≤N, if so, then computing i=i+1, repeats S34, start next group of antenna and get through flow；If it is not,
Represent that all antenna sets get through completion, terminate poll direction finding, wait next direction finding order.
In the present invention, gathered data validity is ensured using Handshake Protocol signal, ensure whole by direction finding Anti-interference algorithm
The stability of individual system acquisition data, for the analysis of direction finding below provides important authentic data, greatly reduces error rates of data, improves
The direction finding degree of accuracy and stability.
Brief description of the drawings
Fig. 1 is specific embodiment of the invention apparatus structure block diagram.
Fig. 2 is direction finding IF process system structure diagram.
Fig. 3 is to Digital Down Convert（DDC）Algorithm flow chart.
Fig. 4 is the anti-interference flow chart of direction finding.
Specific embodiment
This specification（Including any claim, summary and accompanying drawing）Disclosed in any feature or during the step of,
Unless specifically stated otherwise, can alternative features equivalent by other or with similar purpose replaced.I.e., unless specifically stated otherwise,
Each feature is an example in a series of equivalent or similar characteristics.Alternative features are retouched in this specification simultaneously
It is description to technical equivalents to state, and is not construed as the donation to the public.
This specification（Including any claim, summary and accompanying drawing）If middle term has general sense and this area simultaneously
It is special significant, unless otherwise specified, it is defined as the peculiar implication in this area.Below in conjunction with the accompanying drawings to specific implementation of the invention
Example is described in detail.As shown in figure 1, anti-interference single channel direction finding processing unit, including in radiofrequency signal interception system, direction finding
Frequency processing system and terminal.Radiofrequency signal interception system is connected with direction finding IF process system by DB25 interfaces,
Interface SPI SECO radiofrequency signals interception system includes that tuned frequency control, rf attenuation control, intermediate frequency are decayed and controls
System, mode of operation control, intermediate-frequency bandwidth control, power consumption mode control etc..Radiofrequency signal interception system exports analog if signal
Direction finding IF process system is input into by SMA interfaces.Direction finding IF process system passes through pci interface phase with industrial computer terminal
Even.
Direction finding IF process system is by network settings radiofrequency signal interception system, radiofrequency signal interception system capturing ambient
The radio wave signal of middle VHF/UHF frequency ranges, and the radio signal that will be intercepted is converted to analog if signal output to survey
To IF process system, by the data acquisition board in direction finding if system, analog if signal is transformed to digital intermediate frequency letter
Number.The digital medium-frequency signal for receiving is carried out Digital Down Convert treatment generation data base-band signal by direction finding IF process system,
And it is sent to terminal after to data base-band signal carrying out direction finding anti-interference process.Terminal sends intermediate frequency control and refers to
In order input direction finding IF process system, the data base-band signal loopback computer end that direction finding IF process system will have been processed
End, to be for further processing.
Fig. 2 is direction finding IF process system structure diagram.Direction finding IF process system is by field programmable gate array
（FPGA）The standalone feature system of realization, is become by pci interface and industrial computer terminal control center to center communications, including under numeral
Frequently（DDC）Module, direction finding immunity module, data memory module, data outputting module.Digital medium-frequency signal passes through DDC modules
After become data base-band I/Q signal, by direction finding immunity module, analysis direction finding data are carried the data base-band I/Q signal after conversion
Go out interference signal, be stored in data memory module.Finally, the direction finding data in notifying host computer to read data memory module, lead to
Data outputting module is crossed in direction finding data transfer to pci bus.
Fig. 3 is to carry out Digital Down Convert to digital medium-frequency signal（DDC）Algorithm flow chart.First, to entering in DDC systems
Digital medium-frequency signal carry out digital mixing（NCO）.Secondly, the filtering of different bandwidth is carried out according to host computer instruction.Finally, locate
Data base-band signal after the completion of reason, selects system to export data base-band I/Q signal all the way by multichannel data.The tool of DDC algorithms
Body process step is as follows：
S1：Amount of bandwidth to signal is encoded, and forms different bandwidth number, and digital medium-frequency signal is entered by look-up table
Row data are mixed；
S2：Row wide-narrow filtering is entered to different bandwidth signal according to the instruction of host computer network interface, data base-band signal is generated；
Further, step S2 is specially：
S21：Bandwidth number is read according to host computer instruction, if 0 ~ 1, then carry out parallel 256 rank finite impulse response (FIR) broadband
Filtering, filter range is 40M ~ 20M, and continues to judge downwards, if not then reading bandwidth number directly down；
S22：The signal after S21 steps is read, if bandwidth number is 2 ~ 8, serial 128 rank finite impulse response (FIR) broadband is carried out
Filtering, filter range is 5M ~ 1M, and continues to judge downwards, if not then reading bandwidth number directly down；
S23：Frequency deviation adjustment is carried out to the signal after S22 steps；
S24：The signal after S23 steps is read, if bandwidth number is 10 ~ 16, serial 128 rank finite impulse response (FIR) is carried out narrow
Band filtering, filter range is 500K ~ 150K, and continues to judge downwards, if not then reading bandwidth number directly down；
S25：The signal after S24 steps is read, if bandwidth number is 18 ~ 32, serial 128 rank finite impulse response (FIR) is carried out narrow
Band filtering, filter range is 120K ~ 1K, and enters multichannel data selection system, if not being then directly entered multichannel data selection
System.
S3：Data base-band signal needed for selecting system to export by multichannel data.
Fig. 4 is the anti-interference flow chart of direction finding.Digital medium-frequency signal after Digital Down Convert is changed into I/Q data baseband signal,
Handshake Protocol signal is sent first obtains communication with antenna control board.Handshake Protocol signal is a command code of mutual agreement,
Antenna control board is which road antenna and the equipment for closing which road antenna are got through in control.Anti-interference single channel direction finding processing equipment can be with
With antenna control board communication, the fields such as environmental monitoring and data acquisition are may be also used in.Then, the antenna that needs are got through is passed through
Making protocol code by oneself carries out coding and residence time parameter setting.Secondly, direction finding is carried out to every group of antenna collection direction finding data to resist
Interference is processed.Finally, judge whether the antenna of coding all gets through completion.Direction finding anti-interference process is comprised the following steps that：
Step 1：Send Handshake Protocol signal and obtain communication with antenna control board；If not succeeding, start-up study retransmits machine
System, if retransmitting all no successes for continuous 10 times, type of error code is sent to host computer, informs personnel inspection circuit connection and anti-interference
Single channel direction finding processing unit.
Step 2：The antenna that needs are got through is encoded（0~N）With residence time parameter setting.
Step 3：Start day line traffic control trigger signal.
Step 4：Whether the current group antenna i of inquiry gets through successfully；If not getting through, trigger signal is retransmitted, if continuous retransmission 5
Secondary trigger signal antenna cannot be got through, and an error flag code is sent to host computer, and it is high that teaching process personnel overhaul this group of antenna
Whether low side damages.
Step 5：If this group of antenna i gets through successfully, enter line delay debounce, gather direction finding data.Just start to get through day all the way
The data of line collection are unstable, after one section of time delay, gathered after pending data stabilization.
Step 6：According to host computer instruction acquisition set point number direction finding data.
Step 7：Direction finding data to collecting are ranked up, and sequence can be deposited according to data address from small to large,
Rejecting abnormalities direction finding data value.The data of collection have certain limit -16384 to 16384, do not regard as exception then in this scope
Value.
Step 8：After the completion of anti-interference process, in the direction finding data to data memory module of output antenna i.
Step 9：Judge 0≤i≤N, if so, then computing i=i+1, repeats S34, start next group of antenna and get through flow；If
It is no, represent that all antenna sets get through completion, the number of antenna is certain, often gets through one group of antenna and just adds 1, when numerical value is equal to setting
Antenna number thinks that antenna gets through completion, terminates poll direction finding, waits next direction finding order.
Claims (9)
1. a kind of anti-interference single channel direction finding processing unit, including radiofrequency signal interception system, direction finding IF process system and
Terminal；It is characterized in that radiofrequency signal interception system is connected with direction finding IF process system, and to direction finding IF process
System exports analog if signal, and direction finding IF process system is bi-directionally connected with terminal；
The direction finding IF process system is by radiofrequency signal interception system described in network settings, the radiofrequency signal interception system
The radio wave signal of VHF/UHF frequency ranges in capturing ambient, and the radio signal that will be intercepted is converted to analog if signal
The direction finding IF process system is exported, the analog if signal for receiving is converted to number by the direction finding IF process system
After word intermediate-freuqncy signal, Digital Down Convert treatment generation data base-band signal is carried out, and it is anti-dry that direction finding is carried out to data base-band signal
The terminal is sent to after disturbing treatment；
Terminal is sent in intermediate frequency control instruction input direction finding IF process system, and direction finding IF process system will have been processed
Data base-band signal loopback terminal.
2. anti-interference single channel direction finding processing unit according to claim 1, it is characterised in that the direction finding IF process
The standalone feature system that system is realized for field programmable gate array, including Digital Down Converter Module, direction finding immunity module, number
According to memory module, data outputting module；Digital Down Converter Module output end is connected with direction finding immunity module input, and direction finding resists
Interference module output end connects data memory module and data outputting module, data memory module and data outputting module phase respectively
Even；
The digital medium-frequency signal that the Digital Down Converter Module will be received is converted into data base-band signal, and exports to the survey
To immunity module, carry out data analysis direction finding and reject interference signal, treated direction finding data are deposited into the data and deposit
Storage module, and by the data outputting module direction finding data transfer to the terminal.
3. anti-interference single channel direction finding processing unit according to claim 2, it is characterised in that the radiofrequency signal is intercepted and captured
System is connected with the direction finding IF process system by DB25 interfaces.
4. anti-interference single channel direction finding processing unit according to claim 2, it is characterised in that the radiofrequency signal is intercepted and captured
System output analog if signal is input into the direction finding IF process system by SMA interfaces.
5. anti-interference single channel direction finding processing unit according to claim 2, it is characterised in that the direction finding IF process
System is connected with the terminal by pci interface.
6. a kind of anti-interference single channel direction finding processing method, it is characterised in that comprise the following steps：
S1：The radio wave signal of VHF/UHF frequency ranges is converted to analog if signal in capturing ambient；
S2：Analog if signal is converted to digital medium-frequency signal by direction finding IF process system, and carries out digital down-converted
Generation data base-band signal；
S3：Direction finding anti-interference process is carried out to data base-band signal, direction-finding signal is gathered；
S4：Send direction finding data to terminal.
7. anti-interference single channel direction finding processing method according to claim 6, it is characterised in that under numeral described in step S2
Frequency-conversion processing comprises the following steps：
S21：Amount of bandwidth to signal is encoded, and forms different bandwidth number, and digital medium-frequency signal is carried out by look-up table
Data are mixed；
S22：Row wide-narrow filtering is entered to different bandwidth signal according to the instruction of host computer network interface, data base-band signal is generated；
S23：Data base-band signal needed for selecting system to export by multichannel data.
8. anti-interference single channel direction finding processing method according to claim 7, it is characterised in that width described in step S22
Filtering comprises the following steps：
S221：Bandwidth number is read according to host computer instruction, if 0 ~ 1, then carry out parallel 256 rank finite impulse response (FIR) broadband filter
Ripple, filter range is 40M ~ 20M, and continues to judge downwards, if not then reading bandwidth number directly down；
S222：The signal after S221 steps is read, if bandwidth number is 2 ~ 8, serial 128 rank finite impulse response (FIR) broadband filter is carried out
Ripple, filter range is 5M ~ 1M, and continues to judge downwards, if not then reading bandwidth number directly down；
S223：Frequency deviation adjustment is carried out to the signal after S222 steps；
S224：The signal after S223 steps is read, if bandwidth number is 10 ~ 16, serial 128 rank finite impulse response (FIR) arrowband is carried out
Filtering, filter range is 500K ~ 150K, and continues to judge downwards, if not then reading bandwidth number directly down；
S225：The signal after S224 steps is read, if bandwidth number is 18 ~ 32, serial 128 rank finite impulse response (FIR) arrowband is carried out
Filtering, filter range is 120K ~ 1K, and enters multichannel data selection system, if not being then directly entered multichannel data selection system
System.
9. anti-interference single channel direction finding processing method according to claim 6, it is characterised in that locate described in the step S3
Reason comprises the following steps：
S31：Send Handshake Protocol signal and obtain communication with antenna control board；If not succeeding, start-up study retransmission mechanism, if even
Retransmit all no successes for continuous 10 times, type of error code is sent to host computer, inform personnel inspection circuit connection and anti-interference single channel
Direction finding processing unit；
S32：The antenna that needs are got through is encoded（0~N）With residence time parameter setting；
S33：Start day line traffic control trigger signal；
S34：Whether the current group antenna i of inquiry gets through successfully；If not getting through, trigger signal is retransmitted, if 5 triggerings of continuous retransmission
Signal antenna cannot be got through, and an error flag code is sent to host computer, and teaching process personnel overhaul this group of antenna height terminal
Whether damage；
S35：If this group of antenna i gets through successfully, enter line delay debounce, gather direction finding data；
S36：According to host computer instruction acquisition set point number direction finding data；
S37：Direction finding data to collecting are ranked up, rejecting abnormalities direction finding data value；
S38：After the completion of anti-interference process, in the direction finding data to data memory module of output antenna i；
S39：Judge 0≤i≤N, if so, then computing i=i+1, repeats S34, start next group of antenna and get through flow；If it is not, representing
All antenna sets get through completion, terminate poll direction finding, wait next direction finding order.
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| CN108828541A (en) * | 2018-08-01 | 2018-11-16 | 北京润科通用技术有限公司 | A kind of radar echo simulation system |
| CN110907887B (en) * | 2019-10-21 | 2021-02-23 | 成都大公博创信息技术有限公司 | Super-resolution direction-finding processing system based on uniform circular array |
| CN111865436B (en) * | 2020-07-29 | 2022-11-04 | 北京紫光微电子系统有限公司 | Method and system for removing power line interference and electronic equipment |
| CN113835070A (en) * | 2021-09-27 | 2021-12-24 | 大连海天防务科技有限公司 | Radar tactical performance detection and anti-interference capability evaluation simulator |
| CN115290990B (en) * | 2022-09-28 | 2023-02-07 | 北京信息科学技术研究院 | Rapid signal detection and IQ data synchronous storage device |
| CN117056708A (en) * | 2023-10-11 | 2023-11-14 | 成都大公博创信息技术有限公司 | AIS signal identification method based on multi-scale feature fusion and CNN-LSTM |
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