CN105510873B - The signal processing method of S mode answering machine based on amplitude-comprised direction-finding system - Google Patents
The signal processing method of S mode answering machine based on amplitude-comprised direction-finding system Download PDFInfo
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- CN105510873B CN105510873B CN201510864236.4A CN201510864236A CN105510873B CN 105510873 B CN105510873 B CN 105510873B CN 201510864236 A CN201510864236 A CN 201510864236A CN 105510873 B CN105510873 B CN 105510873B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/28—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics
- G01S3/32—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics derived from different combinations of signals from separate antennas, e.g. comparing sum with difference
- G01S3/36—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics derived from different combinations of signals from separate antennas, e.g. comparing sum with difference the separate antennas having differently-oriented directivity characteristics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
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- General Physics & Mathematics (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of signal processing method of the S mode answering machine based on amplitude-comprised direction-finding system, including the signal of reception is filtered, the digital quadrature transformation processing；Signal characteristic abstraction, the signal after extraction carry out request signal azimuthal angle calculation, ASK envelope demodulations respectively；Signal after extraction is handled through two-way；DA chip data dispensing units are inputted after being encoded to the decoded signal of A/C/S mode query signal decoding units；The azimuth provided according to data processing unit, produce answer signal azimuth information and Antenna control information；According to Antenna control information, control antenna realizes omnidirectional and orients the switching of both of which.Asynchronous crosstalk problem caused by the inquiry of ground secondary radar station is greatly decreased；And using directional aerial transmitting-receiving gain, increase detection range and reduce transmitter power；Processing time is short, ageing strong, digitized degree is high.
Description
Technical field
The present invention relates to air traffic control and air traffic safety monitoring field, and in particular to based on amplitude-comprised direction-finding system
S mode answering machine signal processing method.
Background technology
S mode answering machine coordinates airborne TCAS equipment to form TCAS systems to realize absolutely empty coordination collision avoidance, at the same with ground two
Secondary radar, which coordinates, completes air traffic control, generally compatible original ATCRBS (ATCRBS) A/C moulds
Formula answering machine function (usual abbreviation ATC answering machines), while also possess Discrete Address Beacon System (DABS, abbreviation S mode) S moulds
Formula answering machine function.
Traditional S mode answering machine omnidirectional receives 1030MHz request signals, theaomni-directional transmission 1090MHz answer signals.Due to hard
The difference of part environment and channel design, traditional S mode answering machine use two omnidirectional antennas installed in aircraft top and bottom
Line is completed and the inquiry between ground secondary radar station or aerospace plane and response operation, because can not judge request signal
Orientation so that inquiry equipment must keep higher repeat queries frequency and larger transmission power, to maintain and airborne response
Communication between machine, substantial amounts of radiofrequency signal interference be present so as to result in flying area, for increasingly busy aerial friendship
Siphunculus has been manufactured into serious influence, while traditional S mode answering machine can not also share as independent individual with TCAS equipment
Hardware resource and antenna channel, the waste of hardware resource is caused, is not easy to ground maintenance and management.
The content of the invention
It is an object of the invention to provide a kind of signal processing method of the S mode answering machine based on amplitude-comprised direction-finding system,
Solves the orientation that traditional S mode answering machine can not judge request signal so that inquiry equipment must keep higher repeat queries
Frequency and larger transmission power, it is a large amount of so as to cause to exist in flying area to maintain the communication between airborne answering machine
Radiofrequency signal interference, cause serious influence for increasingly busy air traffic control, and traditional S mode answering machine is made
For independent individual, it can not cause the waste of hardware resource with TCAS equipment common hardware resources and antenna channel, be not easy to ground
The problem of face maintenance and management.
The present invention to achieve the above object, is realized using following technical scheme：A kind of S mode response of amplitude-comprised direction-finding system
System, including the digital quadrature transformation unit, digital quadrature signal pretreatment unit, A/C/S mode queries signal decoding unit, S
Pattern response PPM/PCM coding units, DA chip datas dispensing unit, data processing unit, the control of answer signal azimuth are single
Member and omnidirectional/directional aerial control unit；
The digital quadrature transformation unit is used to receive direction-finding signal, and direction-finding signal is filtered；
Digital quadrature signal pretreatment unit is used to carry the signal progress signal characteristic of digital orthogonal transform unit output
Take, request signal azimuthal angle calculation and ASK envelope demodulations；
A/C/S mode queries signal decoding unit is used for the request signal bag to the output of digital quadrature signal pretreatment unit
Network waveform is decoded, and by decoded signal output to data processing unit；
The answer signal that S mode response PPM/PCM coding units provide according to data processing unit is encoded；DA chips
Data configuration unit configures according to the coding information of S mode response PPM/PCM coding units to data；Data processing list
Member is used to produce the machine answer signal data, and the data after processing are distinguished into output valve S mode response PPM/PCM coding units
And external equipment；
Answer signal azimuth control unit is used to produce azimuth control signal；
The azimuth control signal that omnidirectional/directional aerial control unit is sent according to answer signal azimuth control unit,
Antenna is controlled in omnidirectional and orientation both of which switching.
Further, preferably, the digital quadrature transformation unit includes data signal bandpass filter module
With digital quadrature transformer module, data signal bandpass filter module receives direction-finding signal and completes signal filtering, after filtering
Signal through the digital quadrature transformation device group module carry out the digital quadrature transformation processing.
Further, preferably, the digital quadrature signal pretreatment unit include signal characteristic abstraction module,
Request signal azimuthal angle calculation module and ASK envelope demodulation modules, the signal characteristic abstraction module is to the digital quadrature transformation
Signal afterwards carries out feature extraction, obtains signal amplitude, phase, frequency；Request signal azimuthal angle calculation module is according to extracting
Feature, produce request signal azimuth information and be simultaneously transferred to data processing unit；ASK envelope demodulation modules carry according to signal characteristic
The feature that modulus block extracts, request signal envelope waveform is obtained, and the request signal envelope waveform is exported to A/C/S patterns
Request signal decoding unit.
A kind of signal processing method of the S mode answering machine based on above-mentioned amplitude-comprised direction-finding system, including following processing step：
(a) the digital quadrature transformation unit receives pending direction-finding signal, and the signal to receiving is filtered, numeral
Orthogonal transformation is handled；
(b) signal after the digital quadrature transformation is handled enters digital quadrature pretreatment unit, and signal is pre- in digital quadrature
Processing unit completes signal characteristic abstraction, and the signal after extraction carries out request signal azimuthal angle calculation, ASK envelope demodulations respectively；
(c) on the one hand, the signal after extraction obtains request signal azimuth information through request signal azimuthal angle calculation, this is ask
Aspect information input data processing unit is asked, data processing unit exports corresponding response message；On the other hand, after extraction
Signal obtain request signal envelope waveform through ASK envelope demodulations, by the request signal envelope waveform input A/C/S mode queries
Signal decoding unit completes decoding effort；
(d) S mode response PPM/PCM coding units enter to the decoded signal of A/C/S mode query signal decoding units
Row coding, and the signal after coding is inputted into DA chip data dispensing units；
(e) azimuth that answer signal azimuth control unit provides according to data processing unit, answer signal side is produced
Position information and Antenna control information；
(f) Antenna control information that omnidirectional/directional aerial control unit provides according to step (e), control antenna are realized complete
To the switching with orientation both of which.
Further, preferably, the detailed process of request signal azimuthal angle calculation is in the step (c)：
(c1) signal after extraction is received by four antenna element, and the signal that each antenna element is received is sent into
Each self-corresponding channel；
(c2) signal of each channel output is sent to two subtracters respectively；
(c3) in subtracter, the output signal of each antenna element is carried out with the output signal of left and right adjacent antenna elements
Than width computing, orientation code is obtained, and orientation code is transferred to data processing unit and carries out subsequent treatment.
Further, preferably, the detailed process of the step (c2) is：
(c21) signal of four antenna element output is respectively fed to four channels, four channels difference output signal A,
B, C, D, each channel export two paths of signals；
(c22) signal A and B is added to subtracter J1, and signal B and C are added to subtracter J2, and signal C and D are added to subtracter J3,
Signal D and A are added to subtracter J4.
The present invention compared with prior art, has advantages below and beneficial effect：
(1) present invention refers to the hardware circuit design thinking of comprehensive monitoring system on radio-frequency receiving-transmitting passage, coordinates special
TCAS antennas realize the function of radiofrequency signal positioning transceiving, and asynchronous crosstalk caused by the inquiry of ground secondary radar station is greatly decreased
Problem；And using directional aerial transmitting-receiving gain, increase detection range and reduce transmitter power；Request signal orientation resolves and should
The software logic algorithm for answering the control of aspect angle is fully integrated into FPGA, processing time is short, ageing strong, digitized degree
It is high.
(2) present invention can carry out antenna amount and receiving-transmitting chain cutting pattern according to the different demands of application platform, with full
The actual requirement of the different application platforms such as sufficient feeder liner, general-purpose aircraft, ground control point；And can be according to the design of dual-mode antenna
Characteristic, complete the Adaptive matching of answer signal azimuth control software algorithm.
Brief description of the drawings
Fig. 1 is the overall composition structural representation of the present invention；
Fig. 2 is request signal azimuthal angle calculation process schematic；
Fig. 3 is four a period of time of directional aerial directional diagram.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
Embodiment：
As shown in figure 1, a kind of S mode answering system of amplitude-comprised direction-finding system described in the present embodiment, including digital quadrature
Converter unit, digital quadrature signal pretreatment unit, A/C/S mode queries signal decoding unit, S mode response PPM/PCM are compiled
Code unit, DA chip datas dispensing unit, data processing unit, answer signal azimuth control unit and omnidirectional/orientation day
Line traffic control unit；
The digital quadrature transformation unit is used to receive direction-finding signal, and direction-finding signal is filtered；
Digital quadrature signal pretreatment unit is used to carry the signal progress signal characteristic of digital orthogonal transform unit output
Take, request signal azimuthal angle calculation and ASK envelope demodulations；
A/C/S mode queries signal decoding unit is used for the request signal bag to the output of digital quadrature signal pretreatment unit
Network waveform is decoded, and by decoded signal output to data processing unit；
The answer signal that S mode response PPM/PCM coding units provide according to data processing unit is encoded, here
Answer signal is after A/C/S mode queries signal decoding unit decodes according to the request signal of reception, to be transferred to data processing mould
Block, data processing module provide answering for 56bit or 112bit further according to native data and other airborne equipment sensing datas
Answer evidence, then answer signal coding is carried out by S mode response PPM/PCM coding units.
DA chip datas dispensing unit is matched somebody with somebody according to the coding information of S mode response PPM/PCM coding units to data
Put；The configuration of D/A chips is divided into two parts, and a portion is that the working condition of D/A chips is configured, including piece choosing letter
Number, reset signal, reference clock signal, mode of operation signal etc., specifically determined by the databook of selected D/A chips；The
Two parts are the answer signal base band datas exported according to S mode response PPM/PCM coding units, carry out I/Q orthogonal transformations, into
Shape filtering etc. work.
Data processing unit is used to produce the machine answer signal data, and the data after processing are distinguished into output valve S mode
Response PPM/PCM coding units and external equipment；The bearing data of request signal azimuthal angle calculation module output, first to number
According to processing unit, answer signal azimuth control unit is then transmitted further to；Data processing unit is by request signal azimuth number
The target that external equipment is used to show request signal is transferred to according to request signal data etc., and produces answer signal data.Number
The intrinsic information of answering machine is stored according to processing unit, and information exchange, request signal are carried out with other outside Aerial Electronic Equipments
The orientation that azimuthal angle calculation module is calculated needs to be transferred to the display that data processing unit is used for target, while data processing
Unit needs orientation (with request signal orientation corresponding) of the response message of answering machine together with answer signal being transferred to
Subsequent cell/resume module.
Answer signal azimuth control unit is used to produce azimuth control signal；Answer signal azimuth control unit root
The request signal orientation being calculated according to request signal azimuthal angle calculation unit, inverse go out answer signal orientation, orientation simulation
General principle is to be divided using directional aerial in the range of 360 ° centered on aircraft according to prow, tail and fuselage port and starboard
For 4 90 ° of monitor area, as shown in figure 3, A, B, C, D quadrant to be corresponded to four radiating elements of directional aerial respectively, in figure
Arrow show the angular range of all quadrants simulation.According to simulated-aximuth angle, quadrant where controlling the angle with it is adjacent as
The level attenuation value of two radiating elements of limit, and the decay of remaining two radiating elements is maximum, referred to as four amplitude-comprised direction-findings, antenna
It is linearly related between the bearing data that radiating element level value and each simulated target contain.
The azimuth control signal that omnidirectional/directional aerial control unit is sent according to answer signal azimuth control unit,
Antenna is controlled in omnidirectional and orientation both of which switching.
Preferably, the digital quadrature transformation unit is divided into data signal bandpass filter module and digital quadrature transformer mould
Block, data signal bandpass filter module receive direction-finding signal and complete signal filtering, and filtered signal becomes through digital quadrature
Parallel operation group module carries out the digital quadrature transformation processing.
Preferably, digital quadrature signal pretreatment unit is divided into signal characteristic abstraction module, request signal declinometer
Module and ASK envelope demodulation modules are calculated, the signal characteristic abstraction module carries out feature to the signal after the digital quadrature transformation
Extraction, obtains signal amplitude, phase, frequency；Request signal azimuthal angle calculation module produces inquiry letter according to the feature extracted
Number azimuth information is simultaneously transferred to data processing unit；The spy that ASK envelope demodulations module is extracted according to signal characteristic abstraction module
Sign, request signal envelope waveform is obtained, and the request signal envelope waveform is exported to A/C/S mode queries signal and decodes list
Member.
A kind of signal processing method of the S mode answering machine based on above-mentioned amplitude-comprised direction-finding system, including following processing step：
(a) the digital quadrature transformation unit receives pending direction-finding signal, and the signal to receiving is filtered, numeral
Orthogonal transformation is handled；
(b) signal after the digital quadrature transformation is handled enters digital quadrature pretreatment unit, and signal is pre- in digital quadrature
Processing unit completes signal characteristic abstraction, and the signal after extraction carries out request signal azimuthal angle calculation, ASK envelope demodulations respectively；
(c) on the one hand, the signal after extraction obtains request signal azimuth information through request signal azimuthal angle calculation, this is ask
Aspect information input data processing unit is asked, data processing unit exports corresponding response message；On the other hand, after extraction
Signal obtain request signal envelope waveform through ASK envelope demodulations, by the request signal envelope waveform input A/C/S mode queries
Signal decoding unit completes decoding effort；
(d) S mode response PPM/PCM coding units enter to the decoded signal of A/C/S mode query signal decoding units
Row coding, and the signal after coding is inputted into DA chip data dispensing units；
(e) azimuth that answer signal azimuth control unit provides according to data processing unit, answer signal side is produced
Position information and Antenna control information；
(f) Antenna control information that omnidirectional/directional aerial control unit provides according to step (e), control antenna are realized complete
To the switching with orientation both of which.
As shown in Fig. 2 the detailed process of request signal azimuthal angle calculation is in step (c)：
(c1) signal after extraction is received by four antenna element, and the signal that each antenna element is received is sent into
Each self-corresponding channel；
(c2) signal of each channel output is sent to two subtracters respectively；
(c3) in subtracter, the output signal of each antenna element is carried out with the output signal of left and right adjacent antenna elements
Than width computing, orientation code is obtained, and orientation code is transferred to data processing unit and carries out subsequent treatment.
Specifically, the detailed process of step (c2) is：
(c21) signal of four antenna element output is respectively fed to four channels, four channels difference output signal A,
B, C, D, each channel export two paths of signals；
(c22) signal A and B is added to subtracter J1, and signal B and C are added to subtracter J2, and signal C and D are added to subtracter J3,
Signal D and A are added to subtracter J4.
In the present embodiment, channel includes amplifier, wave detector, video logarithmic amplifier, the video frequency output of each channel
All it is added separately to two subtracters to go, to complete the ratio of the antenna element output signal and left and right adjacent antenna elements output signal
Width computing simultaneously provides orientation code, and because each amplification branch gain is identical, therefore orientation number table also represents output signal
Magnitude relationship.
As shown in figure 3, the angle of adjacent antenna axis is referred to as inclination angle, the inclination angle generally allowed between each antenna is identical,
For 4 antennas omnidirectional than width system, inclination angle is 90 °.Angle in neighbouring antenna middle is wave beam crosspoint, generally
The at most low 3dB of ratio of gains maximum gain in wave beam crosspoint, to ensure that the sensitivity of direction-finding system is unlikely in wave beam crosspoint
Decline too much, therefore half beam width is just identical with inclination angle under this limitation.Adjacent antenna wave beam crosspoint and coordinate
360 ° of aximuthpistons are divided into eight regions by the line of origin plus the axis of four antenna beams, be I respectively, II, III,
Ⅳ、Ⅴ、Ⅵ、Ⅶ、Ⅷ.When radar signal incident direction and direct north intoAngle, received simultaneously by four antennas, due to due north
Antenna is now received with larger antenna gain, and output signal is most strong after gain identical receiver.Similarly understand due east
Antenna output signal time is strong.And other two antennas are received with back lobe, output signal very little.
If the directional diagram of antenna is Gaussian function：
Wherein：It is the angle of signal incident direction and antenna boresight axis, specific in Fig. 3, being signal incident direction
With the angle of direct north, K is proportionality constant, value 0.693.Broadband day used by usual omnidirectional amplitude-comparison direction finding system
Line, its directional diagram can be by formulas (1-1) Lai approximate.By θSIt is defined as the axis of four broad-band antennas, θSValue can be 90 °,
180 °, 270 °, 360 °, when radar signal is injected from region I, II, θSValue is 90 °, similarly, when radar signal is from area
When domain III, IV is injected, θSValue is 180 °, by that analogy.For injecting for the radar signal in region I, it is assumed that incident angle
For θ, wherein θ is the folder between the line in adjacent antenna wave beam crosspoint and origin of coordinates formation and radar signal incident direction
Angle, see Fig. 3, then the angle that due north, the axis of broad-band antenna in due east and the incident direction of radar signal are formed is respectively θS/2-
θ、θS/ 2+ θ, it is respectively in the output end of logafier, the power of output signal then：
Wherein G1And G2It is the power gain of two receiving channels respectively, generally they are all equal.
Therefore the power output ratio R of subtraction device is：
To can further it be tried to achieve by formula (1-3)：
From formula (1-4), due to θSIt is known, can as long as obtaining R value after carrying out A/D conversion to power ratio R
To obtain the incident θ values of signal, that is, the refined orientation in the range of the Ith area's 0~45° angle degree of rough azimuth defined
Angle.Similarly, for the radar signal in other regions, computational methods as same use, the incidence of radar signal can be obtained
Angle.
Above-mentioned request signal azimuthal angle calculation measuring method is physically easier to realize, smaller to hardware resource requirements, can
It is high by property, in the case where the required precision to target bearing is not high, 4 quadrants are received by comparing measurement directional aerial
The size of signal amplitude, it is possible to which the orientation of request signal is calculated in realization, and precision can ensure at ± 5 ° or so.
The present embodiment uses above-mentioned request signal azimuth calculation method, under square one, directional reception request signal
Directional aerial gain can be utilized to improve receiver sensitivity and reduce emitter transmission power with transmitting answer signal, to reduce work(
Consumption and caloric value, system reliability is improved, be easy to airline to repair and manage.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
Any simply modification, the equivalent variations made according to the technical spirit of the present invention to above example, each fall within the protection of the present invention
Within the scope of.
Claims (3)
1. the signal processing method of the S mode answering machine based on amplitude-comprised direction-finding system, the S mode response of the amplitude-comprised direction-finding system
Machine includes the digital quadrature transformation unit, digital quadrature signal pretreatment unit, A/C/S mode queries signal decoding unit, S mode
Response PPM/PCM coding units, DA chip datas dispensing unit, data processing unit, answer signal azimuth control unit with
And omnidirectional/directional aerial control unit；
The digital quadrature transformation unit is used to receive direction-finding signal, and direction-finding signal is filtered；
Digital quadrature signal pretreatment unit is used to carry out signal characteristic abstraction to the signal of digital orthogonal transform unit output, ask
Ask the calculating of aspect angle and ASK envelope demodulations；
A/C/S mode queries signal decoding unit is used for the request signal Envelop waves to the output of digital quadrature signal pretreatment unit
Shape is decoded, and by decoded signal output to data processing unit；
The answer signal that S mode response PPM/PCM coding units provide according to data processing unit is encoded；DA chip datas
Dispensing unit configures according to the coding information of S mode response PPM/PCM coding units to data；
Data processing unit is used to produce the machine answer signal data, and the data after processing are distinguished into output valve S mode response
PPM/PCM coding units and external equipment；
Answer signal azimuth control unit is used to produce azimuth control signal；
The azimuth control signal that omnidirectional/directional aerial control unit is sent according to answer signal azimuth control unit, control
Antenna is in omnidirectional and orientation both of which switching；
It is characterized in that：Methods described includes following processing step：
(a) the digital quadrature transformation unit receives pending direction-finding signal, and the signal to receiving is filtered, digital quadrature
Conversion process；
(b) signal after the digital quadrature transformation is handled enters digital quadrature pretreatment unit, and signal pre-processes in digital quadrature
Unit completes signal characteristic abstraction, and the signal after extraction carries out request signal azimuthal angle calculation, ASK envelope demodulations respectively；
(c) on the one hand, the signal after extraction obtains request signal azimuth information through request signal azimuthal angle calculation, the inquiry is believed
Number azimuth information input data processing unit, data processing unit export corresponding response message；On the other hand, the letter after extraction
Number request signal envelope waveform is obtained through ASK envelope demodulations, the request signal envelope waveform is inputted into A/C/S mode query signals
Decoding unit completes decoding effort；
(d) S mode response PPM/PCM coding units are compiled to the decoded signal of A/C/S mode query signal decoding units
Code, and the signal after coding is inputted into DA chip data dispensing units；
(e) azimuth that answer signal azimuth control unit provides according to data processing unit, answer signal orientation letter is produced
Breath and Antenna control information；
(f) Antenna control information that omnidirectional/directional aerial control unit provides according to step (e), control antenna realize omnidirectional and
Orient the switching of both of which.
2. the signal processing method of the S mode answering machine according to claim 1 based on amplitude-comprised direction-finding system, its feature exist
In：The detailed process of request signal azimuthal angle calculation is in the step (c)：
(c1) signal after extraction is received by four antenna element, and the signal that each antenna element is received is sent into each
Corresponding channel；
(c2) signal of each channel output is sent to two subtracters respectively；
(c3) in subtracter, the output signal of each antenna element is carried out than width with the output signal of left and right adjacent antenna elements
Computing, orientation code is obtained, and orientation code is transferred to data processing unit and carries out subsequent treatment.
3. the signal processing method of the S mode answering machine according to claim 2 based on amplitude-comprised direction-finding system, its feature exist
In：The detailed process of the step (c2) is：
(c21) signal of four antenna element output is respectively fed to four channels, four channels difference output signal A, B, C,
D, each channel export two paths of signals；
(c22) signal A and B is added to subtracter J1, and signal B and C are added to subtracter J2, and signal C and D are added to subtracter J3, signal D
Subtracter J4 is added to A.
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| CN106291456B (en) * | 2016-07-29 | 2018-07-24 | 中国航空无线电电子研究所 | A kind of ADS-B earth stations having monopulse direction finding function |
| CN107957571B (en) * | 2017-10-09 | 2021-09-10 | 中国南方电网有限责任公司调峰调频发电公司 | Hydrophone direction finding method and device, computer readable storage medium and computer equipment |
| CN110082711B (en) * | 2019-02-27 | 2023-06-02 | 中国电子科技集团公司第三十六研究所 | Method and device for comparing and direction-finding |
| CN112162233B (en) * | 2020-09-28 | 2023-07-25 | 中国人民解放军空军工程大学 | Two-dimensional wide-angle high-precision angle measurement method based on eight-port four-baseline radio frequency equipment |
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