CN107526056A - A kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment - Google Patents
A kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment Download PDFInfo
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- CN107526056A CN107526056A CN201710708335.2A CN201710708335A CN107526056A CN 107526056 A CN107526056 A CN 107526056A CN 201710708335 A CN201710708335 A CN 201710708335A CN 107526056 A CN107526056 A CN 107526056A
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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
- G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
- G01S3/48—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment, it is characterized in that, including a calibration signal source, by power splitter calibration signal is provided to each passage, each passage is reception antenna signal or calibration signal by switching selection, the real-time phase difference between channels between each direction-finding channels of space is obtained during direction finding by signal processor, detect that number actual phase difference for reaching each antenna of collecting mail subtracts antenna phase difference by measurement phase difference and phase difference between channels obtains, carrying out ambiguity solution to actual phase difference handles to obtain direction of arrival.Advantage：（1）Real time calibration phase difference between channels, greatly reduce to the requirement of the phase equalization of each passage microwave device and cable；（2）Only need a calibration signal source, a power splitter and several SP2T（Single-pole double throw）Switch, is easy to Project Realization；（3）Calibration process is automatically controlled by software, simple to operate.
Description
Technical field
The present invention relates to a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment, belong to electronic countermeasure skill
Art field.
Background technology
When electric wave reaches direction estimation antenna array, because locus difference causes the signal phase of each antenna element reception not
Together, phase-interfer-ometer direction-finding realizes the measurement of angle of arrival degree by determining phase difference of the incoming wave in each array element.Phase
The whether accurate accuracy for being directly related to angle measurement of difference, therefore the accuracy of guarantee phase difference is into phase-interfer-ometer direction-finding
Key point.
The conventional method of phase-interfer-ometer direction-finding is to measure the phase of each receiving channel in advance using the method calibrated in advance
Potential difference, phase difference between channels is subtracted by the phase difference measured during direction finding, obtain radiation source reach each antenna true phase it is poor.Should
Method require each passage microwave device and cable various environment and at a temperature of all keep the relatively stable of phase-frequency characteristic, this is
Extremely difficult task.Therefore need it is a kind of can real time calibration phase difference between channels method.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming prior art, there is provided one kind is based on real-time channel phase
The phase-interfer-ometer direction-finding method of calibration.
In order to solve the above technical problems, the present invention provides a kind of phase-interfer-ometer direction-finding based on real-time channel phase alignment
Method, it is characterized in that, including a calibration signal source, calibration signal is provided to each passage by power splitter, each passage leads to
It is reception antenna signal or calibration signal to cross switch selection, is obtained by signal processor between each direction-finding channels of space during direction finding
Real-time phase difference between channels, detecing number actual phase difference for reaching each antenna of collecting mail, by measurement phase difference to subtract antenna phase poor and logical
Road phase difference obtains, and carrying out ambiguity solution to actual phase difference handles to obtain direction of arrival.
Further, the switch uses SP2T（Single-pole double throw）Switch, is still calibrated for connecting reception antenna signal
Source signal.
Further, in addition to signal processor, the signal processor are used for the measurement and signal arrival of phase difference
The resolving at angle.
Further, comprise the following steps：
Step 1）, using standard signal source radiation assigned frequency and power signal, adjustment servo makes direction estimation antenna array normal direction
The face radiation signal source；
Step 2）, control SP2T, which is switched, to be connected on direction-finder antenna, and signal processor records one group of phase difference P1;
Step 3）, control calibration signal source to produce assigned frequency and power signal, control SP2T switches are connected in calibration signal source,
Signal processor records one group of phase difference P2;
Step 4）, calculate antenna phase difference P3=P1-P2；
Step 5）, control SP2T, which is switched, to be connected in calibration signal source, and calibration signal source is produced successively with assigned frequency and specified power
Signal in raw direction finding bandwidth, the phase difference between channels P4 of signal processor record corresponding frequencies is as real time calibration value；
Step 6）, control SP2T, which is switched, to be connected on direction-finder antenna, and signal processor measures the measurement phase difference P5 for detecing the collection of letters number；
Step 7）, calculate and detect collection of letters actual phase difference P=P5-P3-P4；
Step 8）, handle to obtain direction of arrival to detecing collection of letters actual phase difference P progress ambiguity solutions.
Further, the step 1）It is to specify frequency using standard signal source radiation under the far field condition of Standard Ratio place
Rate and power signal.
Further, the phase difference P1 and P2 refers respectively to measurement phase difference when signal incidence angle is 0 degree and led to
Road phase difference.
The beneficial effect that the present invention is reached：
（1）Real time calibration phase difference between channels, greatly reduce to the requirement of the phase equalization of each passage microwave device and cable；
（2）Only increase a calibration signal source, a power splitter and several SP2T（Single-pole double throw）Switch, is easy to Project Realization；
（3）Calibration process is automatically controlled by software, simple to operate.
Brief description of the drawings
Fig. 1 is the system composition figure of the present invention；
Fig. 2 is the direction estimation antenna array schematic diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment, it is characterized in that, including
One calibration signal source, calibration signal is provided to each passage by power splitter, each passage is to receive day by switching selection
Line signal or calibration signal, the real-time phase difference between channels between each direction-finding channels of space is obtained during direction finding by signal processor,
Detect that number actual phase difference for reaching each antenna of collecting mail subtracts antenna phase difference by measurement phase difference and phase difference between channels obtains, to reality
Border phase difference carries out ambiguity solution and handles to obtain direction of arrival.
In the present embodiment, the switch uses SP2T（Single-pole double throw）Switch, for connecting reception antenna signal or school
Quasi- source signal.
In the present embodiment, in addition to signal processor, the signal processor is used for the measurement of phase difference and signal arrives
Up to the resolving at angle.
In the present embodiment, comprise the following steps：
Step 1）, using standard signal source radiation assigned frequency and power signal, adjustment servo makes direction estimation antenna array normal direction
The face radiation signal source, i.e. signal incidence angle are 0 degree；
Step 2）, control SP2T, which is switched, to be connected on direction-finder antenna, and signal processor records one group of phase difference P1;
Step 3）, control calibration signal source to produce assigned frequency and power signal, control SP2T switches are connected in calibration signal source,
Signal processor records one group of phase difference P2;
Step 4）, calculate antenna phase difference P3=P1-P2；
Step 5）, control SP2T, which is switched, to be connected in calibration signal source, and calibration signal source is produced successively with assigned frequency and specified power
Signal in raw direction finding bandwidth, the phase difference between channels P4 of signal processor record corresponding frequencies is as real time calibration value；
Step 6）, control SP2T, which is switched, to be connected on direction-finder antenna, and signal processor measures the measurement phase difference P5 for detecing the collection of letters number；
Step 7）, calculate and detect collection of letters actual phase difference P=P5-P3-P4；
Step 8）, handle to obtain direction of arrival to detecing collection of letters actual phase difference P progress ambiguity solutions.
In the present embodiment, the step 1）It is to be specified under the far field condition of Standard Ratio place using standard signal source radiation
Frequency and power signal.
In the present embodiment, the phase difference P1 and P2 refer respectively to signal incidence angle for 0 degree when measurement phase difference and
Phase difference between channels.
In the present embodiment：Bearing finding is carried out to 2GHz ~ 18GHz frequency band signals, formed using 4 flat helical antennas
Linear array, as shown in Fig. 2 the input signal frequency range of signal processor is 250MHz ± 200MHz.
Step 1 is pressed with 10MHz steps footpath to 2GHz ~ 18GHz signals first）~ step 4）Order obtain antenna 1 and antenna 2
, antenna phase difference form between antenna 1 and antenna 3, antenna 1 and antenna 4；
When starting direction finding, by step 5）, designated center ± 200MHz scopes are traveled through with step footpath 10MHz, obtain passage 1 with leading to
Phase difference between channels form between road 2, passage 1 and passage 3, passage 1 and passage 4；
By step 6）, obtain detecing the measurement phase difference collected mail number；
Detect that the actual phase difference of collection of letters arrival antenna subtracts antenna phase difference by measurement phase difference and phase difference between channels obtains, i.e.,
Actual phase difference P=P5-P3-P4；
Via above-mentioned processing, ambiguity solution processing is carried out by actual phase difference P and can obtain direction of arrival.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment, it is characterized in that, including a calibration signal
Source, calibration signal is provided to each passage by power splitter, each passage is reception antenna signal or school by switching selection
Calibration signal, the real-time phase difference between channels between each direction-finding channels of space is obtained during direction finding by signal processor, detect the collection of letters number and reach
The actual phase difference of each antenna subtracts antenna phase difference by measurement phase difference and phase difference between channels obtains, and actual phase difference is carried out
Ambiguity solution handles to obtain direction of arrival.
2. a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment according to claim 1, its feature
It is that the switch is switched using SP2T, and source signal is still calibrated for connecting reception antenna signal.
3. a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment according to claim 1, its feature
It is, in addition to signal processor, the signal processor are used for the measurement of phase difference and the resolving of direction of arrival.
4. a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment according to Claims 2 or 3, it is special
Sign is to comprise the following steps：
Step 1）, using standard signal source radiation assigned frequency and power signal, adjustment servo makes direction estimation antenna array normal direction
The face radiation signal source；
Step 2）, control SP2T, which is switched, to be connected on direction-finder antenna, and signal processor records one group of phase difference P1;
Step 3）, control calibration signal source to produce assigned frequency and power signal, control SP2T switches are connected in calibration signal source,
Signal processor records one group of phase difference P2;
Step 4）, calculate antenna phase difference P3=P1-P2；
Step 5）, control SP2T, which is switched, to be connected in calibration signal source, and calibration signal source is produced successively with assigned frequency and specified power
Signal in raw direction finding bandwidth, the phase difference between channels P4 of signal processor record corresponding frequencies is as real time calibration value；
Step 6）, control SP2T, which is switched, to be connected on direction-finder antenna, and signal processor measures the measurement phase difference P5 for detecing the collection of letters number；
Step 7）, calculate and detect collection of letters actual phase difference P=P5-P3-P4；
Step 8）, handle to obtain direction of arrival to detecing collection of letters actual phase difference P progress ambiguity solutions.
5. a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment according to claim 4, its feature
It is the step 1）It is that standard signal source radiation assigned frequency and power signal are used under the far field condition of Standard Ratio place.
6. a kind of phase-interfer-ometer direction-finding method based on real-time channel phase alignment according to claim 4, its feature
It is that the phase difference P1 and P2 refers respectively to the measurement phase difference and phase difference between channels when signal incidence angle is 0 degree.
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Cited By (7)
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| CN108333556A (en) * | 2018-01-31 | 2018-07-27 | 成都泰格微波技术股份有限公司 | A kind of multichannel direction-finding receiver calibration system and method based on error correction |
| CN108333557A (en) * | 2018-01-31 | 2018-07-27 | 成都泰格微波技术股份有限公司 | A kind of phase alignment system and method for multichannel direction-finding receiver |
| CN109507638A (en) * | 2018-11-30 | 2019-03-22 | 南京长峰航天电子科技有限公司 | A kind of amplitude-comprised direction-finding method and system |
| CN109782217A (en) * | 2019-01-25 | 2019-05-21 | 中国人民解放军空军研究院战略预警研究所 | A kind of method and device for calibrating airborne interferometer calibration value |
| CN110208737A (en) * | 2019-07-08 | 2019-09-06 | 成都爱科特科技发展有限公司 | A kind of ultrashort wave binary channels broadband direction-finding system and thresholding determine direction-finding method |
| CN111289950A (en) * | 2020-03-06 | 2020-06-16 | 南京长峰航天电子科技有限公司 | Signal channel calibration method and device based on correlation and least square |
| CN113740796A (en) * | 2021-07-23 | 2021-12-03 | 中国电子科技集团公司第二十九研究所 | Device and method for aligning calibration radiation source to normal line of direction-finding antenna |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333556A (en) * | 2018-01-31 | 2018-07-27 | 成都泰格微波技术股份有限公司 | A kind of multichannel direction-finding receiver calibration system and method based on error correction |
| CN108333557A (en) * | 2018-01-31 | 2018-07-27 | 成都泰格微波技术股份有限公司 | A kind of phase alignment system and method for multichannel direction-finding receiver |
| CN108333556B (en) * | 2018-01-31 | 2020-04-28 | 成都泰格微波技术股份有限公司 | Multichannel direction finding receiver calibration system and method based on error correction |
| CN108333557B (en) * | 2018-01-31 | 2020-05-19 | 成都泰格微波技术股份有限公司 | Phase calibration system and method of multi-channel direction finding receiver |
| CN109507638A (en) * | 2018-11-30 | 2019-03-22 | 南京长峰航天电子科技有限公司 | A kind of amplitude-comprised direction-finding method and system |
| CN109782217A (en) * | 2019-01-25 | 2019-05-21 | 中国人民解放军空军研究院战略预警研究所 | A kind of method and device for calibrating airborne interferometer calibration value |
| CN110208737A (en) * | 2019-07-08 | 2019-09-06 | 成都爱科特科技发展有限公司 | A kind of ultrashort wave binary channels broadband direction-finding system and thresholding determine direction-finding method |
| CN110208737B (en) * | 2019-07-08 | 2024-05-14 | 成都爱科特科技发展有限公司 | Ultrashort wave double-channel broadband direction finding system and threshold judgment direction finding method |
| CN111289950A (en) * | 2020-03-06 | 2020-06-16 | 南京长峰航天电子科技有限公司 | Signal channel calibration method and device based on correlation and least square |
| CN113740796A (en) * | 2021-07-23 | 2021-12-03 | 中国电子科技集团公司第二十九研究所 | Device and method for aligning calibration radiation source to normal line of direction-finding antenna |
| CN113740796B (en) * | 2021-07-23 | 2023-08-25 | 中国电子科技集团公司第二十九研究所 | Device and method for enabling calibration radiation source to face normal line of direction-finding antenna |
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