CN113835073A - Phased array weather radar and method and system for correcting transmitting amplitude and phase thereof - Google Patents
Phased array weather radar and method and system for correcting transmitting amplitude and phase thereof Download PDFInfo
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- CN113835073A CN113835073A CN202111428823.0A CN202111428823A CN113835073A CN 113835073 A CN113835073 A CN 113835073A CN 202111428823 A CN202111428823 A CN 202111428823A CN 113835073 A CN113835073 A CN 113835073A
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a phased array weather radar and a method and a system for correcting transmitting amplitude and phase thereof, which measure the amplitude and phase of each transmitting channel under different scanning angles and different transmitting powers or temperatures, calculate the amplitude difference and the phase difference between other transmitting channels and a reference channel by taking a certain transmitting channel as the reference channel, correct the amplitude and the phase of each transmitting channel by taking the amplitude difference and the phase difference as compensation or correction parameters, and reduce or eliminate the influence of active standing wave change and temperature on the amplitude and the phase of each transmitting channel.
Description
Technical Field
The invention belongs to the technical field of phased array radars, and particularly relates to a phased array weather radar and a method and a system for correcting the transmitting amplitude and the phase of the phased array weather radar.
Background
In the field of weather detection, a phased array technology becomes a main technology for weather radar development, and the key point of the phased array technology is consistency correction of amplitude and phase of a transmitting channel.
At present, phased array weather radar mainly has the following two types of methods in the aspect of consistency correction of the amplitude and the phase of a transmitting channel:
in the first category, no correction methods for active effects are considered. The method being only for phased array weather radarnThe fixed amplitude and phase between the transmit channels are corrected, although to account fornAmplitude difference and phase difference problems caused by errors of components and physical connection between emission channels cannot be solved in the scanning process of the phased array weather radar along with the change of active standing wavesnThe variation in amplitude and phase between the transmit channels has limitations.
Second, correction methods that take into account the effects of active standing waves but do not take into account the effects of temperature. The generated heat is large due to the large transmitting power of the phased array weather radar transmitter, which results in temperature pairsnThe way-transmitting channel has a certain influence, which in turn influencesnThe method also has certain limitations because of the amplitude and phase of the transmission channel.
Disclosure of Invention
The invention aims to provide a phased array weather radar, and a method and a system for correcting the transmitting amplitude and the phase of the phased array weather radar, so as to solve the problem that the change of active standing waves cannot be corrected in the prior artnAmplitude-phase differences (i.e., amplitude differences and phase differences) between the transmit channels, and caused by temperature variationsnAmplitude phase difference between the emission channels.
The invention solves the technical problems through the following technical scheme: a phased array weather radar transmission amplitude and phase correction method comprises the following steps:
step 1: determining the scanning range of the phased array weather radar according to the detection requirement and performance;
obtaining the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i A corresponding relationship therebetween, whereinT min ＜T i ≤T max ，T min When the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximum;
step 2: at a certain transmission powerQ i Or a certain temperatureT i Then, a scan angle phi in the scan range is measured j While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scanning angle of the phased array weather radar;
and step 3: to be provided withnIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q；
and 4, step 4: selecting the next scanning angle, and repeating the steps 2-3 until the emission power is obtainedQ i OrT i The second corresponding to each scanning anglekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 5: selecting the next transmitting power or temperature, and repeating the steps 2-4 until the second transmitting power or temperature corresponding to all the temperatures and all the scanning angles is obtainedkAmplitude difference and phase difference between the path transmitting channel and the reference channel;
step 6: saving the second data obtained from said step 5 at each scanning angle and each temperaturekRoad transmitting channelAmplitude and phase differences between the traces and the reference channel;
and 7: when the phased array weather radar scans at a certain scanning angle and a certain temperature, a first time corresponding to the scanning angle and the temperature is acquiredkAnd compensating the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel, so as to realize the consistency correction of the amplitude and the phase of each transmitting channel.
According to the active sourceSThe relation between the parameters and the amplitude-phase difference of each path of transmitting channel, when the active standing wave of the phased array weather radar changes in the scanning process, the amplitude-phase difference of each path of transmitting channel also changes; when the transmitting power is different, the generated heat is different, and the influence of the temperature on each transmitting channel is different; the invention measures the amplitude and phase of each path of transmitting channel under different scanning states (or scanning angles) and different transmitting powers or temperatures, calculates the amplitude difference, and can realize the correction of the amplitude and phase of each path of transmitting channel by taking the amplitude difference as a compensation parameter, thereby reducing or eliminating the influence of active standing wave change and temperature on the amplitude and phase of each path of transmitting channel.
The invention also provides a method for correcting the transmitting amplitude and the phase of the phased array weather radar, which comprises the following steps:
step 1: determining the scanning range of the phased array weather radar according to the detection requirement and performance;
obtaining the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i A corresponding relationship therebetween, whereinT min ＜T i ≤T max ，T min When the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximum;
step 2: a certain scanning angle phi in the scanning range j Then, measure the power of a certain transmissionQ i Or a certain temperatureT i While scanningnThe amplitude and phase of the channel transmission channel;
and step 3: to be provided withnIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q；
and 4, step 4: selecting the next transmitting power or temperature, and repeating the steps 2-3 until the scanning angle phi is obtained j At each transmitted power or temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 5: selecting the next scanning angle, and repeating the steps 2-4 until the second scanning angles corresponding to all the temperatures are obtainedkAmplitude difference and phase difference between the path transmitting channel and the reference channel;
step 6: saving the second data obtained from said step 5 at each scanning angle and each temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 7: when the phased array weather radar scans at a certain scanning angle and a certain temperature, a first time corresponding to the scanning angle and the temperature is acquiredkAnd compensating or correcting the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel.
Further, in the step 1, the scanning range of the phased array weather radar is-45 to + 45 degrees.
Further, in the step 1, the temperature is acquiredT i The concrete implementation steps of the corresponding relation between the power and the transmitting power of the transmitter are as follows:
step 1.1: arranging a temperature sensor on the circuit board corresponding to the transmitting channel;
step 1.2: when the transmission power isWhen the time is zero, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT min ；
Step 1.3: when phased array weather radar is used to transmit powerQ 1When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 1(ii) a When phased array weather radar is used to transmit powerQ 2When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 2(ii) a When phased array weather radar is used to transmit powerQ 3When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 3(ii) a In the same way, when the phased array weather radar is used for transmitting power with the maximumQ max When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT max ；
Step 1.4: according to the groups of (Q i ，T i ) And drawing a curve between the transmitting power and the temperature, and solving a relational expression corresponding to the curve to obtain a corresponding relation between the temperature and the transmitting power.
Further, in the step 2, the measurement is carried out by a vector network analyzernThe amplitude and phase of the channel are transmitted.
Further, in the step 3, tonThe 1 st transmitting channel in the transmitting channels is used as a reference channel.
Furthermore, the bottom layer of the circuit board corresponding to the transmitting channel is eutectic-welded on the aluminum alloy structural member, so that heat dissipation is facilitated, and temperature pairs are reducednThe influence of the channel is transmitted.
The invention also provides a phased array weather radar transmitting amplitude and phase correction system, which comprises:
an input unit for inputting the scanning range of the phased array weather radar and the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i Corresponding relation between them, and temperatureT i And transmit powerQ i A value range;
a measuring unit for measuring the different transmission powersQ i Or temperatureT i And different scanning angles phi j While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scanning angle of the phased array weather radar;
a computing unit fornIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q；
a storage unit for storing all the transmission powers and the second powers corresponding to all the scanning angleskAmplitude difference and phase difference between the path transmitting channel and the reference channel;
a correction unit for acquiring a first time corresponding to a certain scanning angle and a certain temperature when the phased array weather radar scans at the scanning angle and the temperaturekAnd compensating the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel, so as to realize the consistency correction of the amplitude and the phase of each transmitting channel.
The present invention also provides a phased array weather radar, comprising:
an input and holding unit for inputting and holding the second data obtained by the emission amplitude and phase correction method as described above at each scanning angle and each temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
a correction unit for acquiring and scanning the phased array weather radar at a certain scanning angle and a certain temperatureAngle and temperature of the secondkAnd compensating the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference, so as to realize the consistency correction of the amplitude and the phase of each transmitting channel.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the phased array weather radar and the method and the system for correcting the transmitting amplitude and the phase thereof provided by the invention measure the amplitude and the phase of each transmitting channel under different scanning states (or scanning angles) and different transmitting powers or temperatures, calculate the amplitude difference, and realize the correction of the amplitude and the phase of each transmitting channel by taking the amplitude difference as a compensation parameter or a correction parameter, thereby reducing or eliminating the influence of active standing wave change and temperature on the amplitude and the phase of each transmitting channel.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a phased array weather radar transmit amplitude and phase correction method in an embodiment of the invention.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Example 1
As shown in fig. 1, the method for correcting the transmitting amplitude and phase of the phased array weather radar provided by the embodiment includes the following steps:
step 1: determining the scanning range of the phased array weather radar according to the detection requirement and performance; and acquiring the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i The corresponding relation between them.
For the phased array weather radar, a coupler with calibration performance is arranged between a transmitting channel and an antenna, each transmitting channel is coupled with a part of signals through the coupler, and the amplitude and the phase of each transmitting channel are obtained by measuring the coupling parameters of each channel correspondingly.
The scanning range of the phased array weather radar is determined according to detection requirements and performance, generally, the larger the scanning range is, the better the scanning range is, but the scanning range is increased, the scanning period is increased, the scanning speed is reduced, and therefore the scanning range is determined according to actual application requirements. In this embodiment, the scanning range is-45 to + 45, i.e., 45 to phi j Less than or equal to + 45 deg. In the range of-45 to + 45 degrees,nthe coupling degree of the path emission channel and the main channel meets-40 dB to-20 dB,nthe amplitude consistency of the coupling degrees among the emission channels is less than or equal to 0.5dB, and the phase consistency is less than or equal to 1 degree.
In order to determine the influence of the transmitting power of the transmitter on the temperature of the circuit board corresponding to the transmitting channel, the relationship between the transmitting power and the temperature of the circuit board needs to be obtained through tests, and the specific implementation process is as follows:
step 1.1: the temperature sensor is arranged on the circuit board corresponding to the emission channel, the temperature sensor is arranged on the top layer of the circuit board in the embodiment, and the bottom layer of the circuit board is eutectic-welded on the aluminum alloy structural member, so that heat balance and heat dissipation are facilitated, and temperature pairs are reducednThe influence of the channel is transmitted.
Step 1.2: when the transmitting power is zero, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT min 。
Step 1.3: when phased array weather radar is used to transmit powerQ 1When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 1(ii) a When phased array weather radar is used to transmit powerQ 2When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 2(ii) a When phased array weather radar is used to transmit powerQ 3When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 3(ii) a In the same way, when the phased array weather radar is used for transmitting power with the maximumQ max When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT max 。
Step 1.4: according to the groups of (Q i ，T i ) And drawing a curve between the transmitting power and the temperature, and solving a relational expression corresponding to the curve to obtain the corresponding relation between the temperature and the transmitting power. Wherein the content of the first and second substances,T min ＜T i ≤T max ，T min when the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max 0 < (r) > is the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximumQ i ≤Q max ，Q max Is the maximum transmit power.
Step 2: at a certain transmission powerQ i Or a certain temperatureT i Then, a scan angle phi in a scan range is measured j While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scan angle of the phased array weather radar.
In this embodiment, a vector network analyzer is used to measure the power at a certain transmission powerQ i Or a certain temperatureT i At a certain scanning angle phi j While scanningnThe amplitude and phase of the channel are transmitted.
And step 3: to be provided withnIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q. Wherein the content of the first and second substances,
is indicated at the transmission powerQ i OrT i Then according to the scanning angle phi j When scanning is performedkEmitting channel and reference channelqThe difference in the amplitude between them is,
is indicated at the transmission powerQ i OrT i Then according to the scanning angle phi j When scanning is performedkEmitting channel and reference channelqThe phase difference between them.
In this embodiment, the followingnThe 1 st transmitting channel in the transmitting channels is used as a reference channel.
And 4, step 4: selecting the next scanning angle, and repeating the steps 2-3 until the emission power is obtainedQ i OrT i The second corresponding to each scanning anglekThe amplitude and phase differences between the transmit and reference channels are shown in table 1.
TABLE 1 at transmit PowerQ i OrT i Amplitude difference and phase difference corresponding to different scanning angles
And 5: selecting the next transmitting power or temperature, repeating the steps 2-4 until all temperatures (or transmitting powers) and the second corresponding to all scanning angles are obtainedkThe amplitude and phase differences between the transmit and reference channels are shown in table 2.
TABLE 2 amplitude and phase differences at different temperatures and different scanning angles
Step 6: save the second power at each scan angle and each temperature (or transmit power) resulting from step 5kThe amplitude and phase differences between the transmit channel and the reference channel.
And 7: when a phased array weather radar scans at a certain scanning angle and a certain temperature (or transmitting power), a first time is acquired corresponding to the scanning angle and the temperature (or transmitting power)kAnd compensating the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel, so as to realize the consistency correction of the amplitude and the phase of each transmitting channel.
The present embodiment also provides a phased array weather radar transmission amplitude and phase correction system, including:
an input unit for inputting the scanning range of the phased array weather radar and the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i Corresponding relation between them, and temperatureT i And transmit powerQ i And (4) value range.
In this embodiment, the scanning range is-45 to + 45. In the range of-45 to + 45 degrees,nthe coupling degree of the path emission channel and the main channel meets-40 dB to-20 dB,nthe amplitude consistency of the coupling degrees among the emission channels is less than or equal to 0.5dB, and the phase consistency is less than or equal to 1 degree.T min ＜T i ≤T max ，T min When the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max 0 < (r) > is the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximumQ i ≤Q max ，Q max Is the maximum transmit power.
A measuring unit for measuring the different transmission powersQ i Or temperatureT i And a scanning angle phi j While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scan angle of the phased array weather radar.
In this embodiment, the measurement unit is a vector network analyzer.
A computing unit fornIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q。
a storage unit for storing all the transmission powers and the second powers corresponding to all the scanning angleskThe amplitude and phase differences between the transmit and reference channels are shown in table 2.
A correction unit for acquiring a first data corresponding to a certain scanning angle and a certain temperature (or transmitting power) when the phased array weather radar scans at the scanning angle and the temperature (or transmitting power)kThe amplitude difference and the phase difference between the emission channels and the reference channel are used for compensating the amplitude and the phase of each emission channel so as to realize the purpose of each emission channelAnd (4) correcting the amplitude and phase consistency of the transmitting channels.
The present invention also provides a phased array weather radar, comprising:
an input and holding unit for inputting and holding the second order at each scanning angle and each temperature (or transmission power) obtained by the transmission amplitude and phase correction method described in embodiment 1kThe amplitude and phase differences between the transmit and reference channels (as shown in table 2).
A correction unit for acquiring a first data corresponding to a certain scanning angle and a certain temperature (or transmitting power) when the phased array weather radar scans at the scanning angle and the temperature (or transmitting power)kAnd compensating the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference, so as to realize the consistency correction of the amplitude and the phase of each transmitting channel.
According to the active sourceSRelation between parameter and amplitude difference of each transmitting channel
Wherein
For transmitting channelsiTo the transmitting channelkThe parameter of (2) is set to be,V i 、V k are respectively a transmitting channeliEmission channelkWhen the active standing wave of the phased array weather radar changes in the scanning process, the amplitude-phase difference between each path of transmitting channel also changes; when the transmitting power is different, the generated heat is different, and the influence of the temperature on each transmitting channel is different; the invention measures the amplitude and phase of each path of transmitting channel under different scanning states (or scanning angles) and different transmitting powers or temperatures, calculates the amplitude difference, and can realize the correction of the amplitude and phase of each path of transmitting channel by taking the amplitude difference as a compensation parameter, thereby reducing or eliminating the influence of active standing wave change and temperature on the amplitude and phase of each path of transmitting channel, improving the performance of a main lobe and a side lobe of the phased array weather radar,the beam pointing of the phased array weather radar is improved.
Example 2
The method for correcting the transmitting amplitude and the phase of the phased array weather radar provided by the embodiment comprises the following steps of:
step 1: determining the scanning range of the phased array weather radar according to the detection requirement and performance; and acquiring the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i The corresponding relation between them.
In this embodiment, the scanning range is-45 to + 45, i.e., 45 to phi j Less than or equal to + 45 deg. In the range of-45 to + 45 degrees,nthe coupling degree of the path emission channel and the main channel meets-40 dB to-20 dB,nthe amplitude consistency of the coupling degrees among the emission channels is less than or equal to 0.5dB, and the phase consistency is less than or equal to 1 degree.
In order to determine the influence of the transmitting power of the transmitter on the temperature of the circuit board corresponding to the transmitting channel, the relationship between the transmitting power and the temperature of the circuit board needs to be obtained through tests, and the specific implementation process is as follows:
step 1.1: the temperature sensor is arranged on the circuit board corresponding to the emission channel, the temperature sensor is arranged on the top layer of the circuit board in the embodiment, and the bottom layer of the circuit board is eutectic-welded on the aluminum alloy structural member, so that heat dissipation is facilitated, and temperature pairs are reducednThe influence of the channel is transmitted.
Step 1.2: when the transmitting power is zero, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT min 。
Step 1.3: when phased array weather radar is used to transmit powerQ 1When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 1(ii) a When phased array weather radar is used to transmit powerQ 2When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 2(ii) a When phased array weather radar is used to transmit powerQ 3When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 3(ii) a By analogy, when phased array weatherRadar with maximum transmitting powerQ max When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT max 。
Step 1.4: according to the groups of (Q i ，T i ) And drawing a curve between the transmitting power and the temperature, and solving a relational expression corresponding to the curve to obtain the corresponding relation between the temperature and the transmitting power. Wherein the content of the first and second substances,T min ＜T i ≤T max ，T min when the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max 0 < (r) > is the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximumQ i ≤Q max ，Q max Is the maximum transmit power.
Step 2: at a certain scanning angle phi j Then, measure the power of a certain transmissionQ i Or a certain temperatureT i While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scan angle of the phased array weather radar.
And step 3: to be provided withnIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q. Wherein the content of the first and second substances,
is expressed in the scanning angle phi j At the following transmitting powerQ i OrT i When scanning is performedkEmitting channel and reference channelqThe difference in the amplitude between them is,
is expressed in the scanning angle phi j At the following transmitting powerQ i OrT i When scanning is performedkEmitting channel and reference channelqThe phase difference between them.
In this embodiment, the followingnThe 1 st transmitting channel in the transmitting channels is used as a reference channel.
And 4, step 4: selecting the next transmitting power or temperature, and repeating the steps 2-3 until the scanning angle phi is obtained j Lower per transmission powerQ i OrT i To a corresponding secondkThe amplitude and phase differences between the transmit channel and the reference channel.
And 5: selecting the next scanning angle, and repeating the steps 2-4 until all temperatures (or emission power) and the second scanning angles corresponding to all the scanning angles are obtainedkThe amplitude and phase differences between the transmit and reference channels are shown in table 2.
Step 6: save the second power at each scan angle and each temperature (or transmit power) resulting from step 5kThe amplitude and phase differences between the transmit channel and the reference channel.
And 7: when a phased array weather radar scans at a certain scanning angle and a certain temperature (or transmitting power), a first time is acquired corresponding to the scanning angle and the temperature (or transmitting power)kAnd compensating the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel, so as to realize the consistency correction of the amplitude and the phase of each transmitting channel.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (9)
1. A phased array weather radar transmission amplitude and phase correction method is characterized by comprising the following steps:
step 1: determining the scanning range of the phased array weather radar according to the detection requirement and performance;
obtaining the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i A corresponding relationship therebetween, whereinT min ＜T i ≤T max ，T min When the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximum;
step 2: at a certain transmission powerQ i Or a certain temperatureT i Then, a scan angle phi in the scan range is measured j While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scanning angle of the phased array weather radar;
and step 3: to be provided withnIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q；
and 4, step 4: selecting the next scanning angle, and repeating the steps 2-3 until the emission power is obtainedQ i OrT i The second corresponding to each scanning anglekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 5: selecting the next transmitting power or temperature, and repeating the steps 2-4 until the second transmitting power or temperature corresponding to all the temperatures and all the scanning angles is obtainedkAmplitude difference and phase difference between the path transmitting channel and the reference channel;
step 6: saving the second data obtained from said step 5 at each scanning angle and each temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 7: when the phased array weather radar scans at a certain scanning angle and a certain temperature, a first time corresponding to the scanning angle and the temperature is acquiredkAnd compensating or correcting the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel.
2. A phased array weather radar transmission amplitude and phase correction method is characterized by comprising the following steps:
step 1: determining the scanning range of the phased array weather radar according to the detection requirement and performance;
obtaining the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i A corresponding relationship therebetween, whereinT min ＜T i ≤T max ，T min When the transmitting power is zero, the temperature of the circuit board corresponding to the transmitting channel is detected,T max the temperature of the circuit board corresponding to the transmitting channel when the transmitting power is maximum;
step 2: a certain scanning angle phi in the scanning range j Then, measure the power of a certain transmissionQ i Or a certain temperatureT i While scanningnThe amplitude and phase of the channel transmission channel;
and step 3: to be provided withnIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q；
and 4, step 4: selecting the next transmitting power or temperature, and repeating the steps 2-3 until the scanning angle phi is obtained j At each transmitted power or temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 5: selecting the next scanning angle, and repeating the steps 2-4 until the second scanning angles corresponding to all the temperatures are obtainedkAmplitude difference and phase difference between the path transmitting channel and the reference channel;
step 6: saving the second data obtained from said step 5 at each scanning angle and each temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
and 7: when the phased array weather radar scans at a certain scanning angle and a certain temperature, a first time corresponding to the scanning angle and the temperature is acquiredkAnd compensating or correcting the amplitude and the phase of each transmitting channel by using the amplitude difference and the phase difference between the transmitting channel and the reference channel.
3. The phased array weather radar transmission amplitude and phase correction method of claim 1 or 2, wherein in step 1, the scanning range of the phased array weather radar is-45 ° to + 45 °.
4. The phased array weather radar transmit amplitude and phase correction method of claim 1 or 2, wherein in step 1, the temperature is obtainedT i The concrete implementation steps of the corresponding relation between the power and the transmitting power of the transmitter are as follows:
step 1.1: arranging a temperature sensor on the circuit board corresponding to the transmitting channel;
step 1.2: when the transmitting power is zero, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT min ；
Step 1.3: when phased array weather radar is used to transmit powerQ 1When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 1(ii) a When phased array weather radar is used to transmit powerQ 2When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 2(ii) a When phased array weather radar is used to transmit powerQ 3When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT 3(ii) a In the same way, when the phased array weather radar is used for transmitting power with the maximumQ max When scanning is carried out, the circuit board corresponding to the transmitting channel is obtained through the temperature sensorT max ；
Step 1.4: according to the groups of (Q i ，T i ) And drawing a curve between the transmitting power and the temperature, and solving a relational expression corresponding to the curve to obtain a corresponding relation between the temperature and the transmitting power.
5. The phased array weather radar transmission amplitude and phase correction method of claim 1 or 2, wherein in step 2, the measurement is performed by a vector network analyzernThe amplitude and phase of the channel are transmitted.
6. The phased array weather radar transmission amplitude and phase correction method of claim 1 or 2, wherein in step 3, the phase correction is performed bynThe 1 st transmitting channel in the transmitting channels is used as a reference channel.
7. The phased array weather radar transmitting amplitude and phase correction method as claimed in claim 1 or 2, wherein the bottom layer of the circuit board corresponding to the transmitting channel is eutectic-welded on the aluminum alloy structural member.
8. A phased array weather radar transmit amplitude and phase correction system, comprising:
an input unit for inputting the scanning range of the phased array weather radar and the temperature of the circuit board corresponding to the transmitting channelT i With transmitter transmit powerQ i Corresponding relation between them, and temperatureT i And transmit powerQ i A value range;
a measuring unit for measuring the different transmission powersQ i Or temperatureT i And different scanning angles phi j While scanningnAmplitude and phase of the channel, where min ≤Φ j ≤Φ max ，Φ min Is the minimum scanning angle, phi, of a phased array weather radar max Is the maximum scanning angle of the phased array weather radar;
a computing unit fornIn the transmitting channelqThe channel transmitting channel is used as a reference channel to calculatekAmplitude difference between the channel transmitting channel and the reference channel
Phase difference of sum
Whereink＝1,2,3,…,nAnd is andk≠q；
a storage unit for storing all the transmission powers and the second powers corresponding to all the scanning angleskAmplitude difference and phase difference between the path transmitting channel and the reference channel;
a correction unit for acquiring a first time corresponding to a certain scanning angle and a certain temperature when the phased array weather radar scans at the scanning angle and the temperaturekAmplitude difference and phase difference between the emitting channel and the reference channel, and emitting the signals to each channel according to the amplitude difference and the phase differenceThe amplitude and phase of the channel are compensated or corrected.
9. A phased array weather radar, comprising:
an input and holding unit for inputting and holding the data obtained by the emission amplitude and phase correction method according to any one of claims 1 to 7 at each scanning angle and each temperaturekAmplitude difference and phase difference between the path transmitting channel and the reference channel;
a correction unit for acquiring a first time corresponding to a certain scanning angle and a certain temperature when the phased array weather radar scans at the scanning angle and the temperaturekAnd compensating or correcting the amplitude and the phase of each transmitting channel by the amplitude difference and the phase difference.
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