CN107976677B - Weak weather target detection method, electronic equipment and storage medium - Google Patents

Weak weather target detection method, electronic equipment and storage medium Download PDF

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CN107976677B
CN107976677B CN201711014950.XA CN201711014950A CN107976677B CN 107976677 B CN107976677 B CN 107976677B CN 201711014950 A CN201711014950 A CN 201711014950A CN 107976677 B CN107976677 B CN 107976677B
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吴翘
林光
林辉
李家杰
李百锋
周至凯
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Guangzhou Zhongnan Civil Aviation Air Traffic Control Technology Equipment Engineering Co ltd
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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
    • G01S13/958—Theoretical aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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Abstract

The invention discloses a method for detecting a weak meteorological target, which comprises the following steps: acquiring the current angle of a radar and the transmitting power of electromagnetic waves transmitted by the radar; acquiring first reflection power of electromagnetic waves reflected by a fixed reflector under the current meteorological condition; and judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power. The invention also discloses an electronic device and a storage medium, and the detection method of the weak meteorological target, the electronic device and the storage medium provided by the invention judge the type of the weak meteorological target in the space corresponding to the current angle of the radar through the transmitting power of the electromagnetic wave and the first reflected power of the electromagnetic wave after being reflected by the fixed reflector, and the type of the weak meteorological target in the space corresponding to each angle of the radar can be detected by changing the angle of the radar.

Description

Weak weather target detection method, electronic equipment and storage medium
Technical Field
The invention relates to the field of meteorological detection, in particular to a method for detecting a weak meteorological target, electronic equipment and a storage medium.
Background
The conventional detection method is to emit radio frequency pulse waves with certain frequency, duration, power and pulse repetition frequency and then receive echo information scattered back by precipitation particles.
The scattering and absorption of radar emission waves by precipitation are related to characteristics such as raindrop spectrums, rain intensities, phase states of precipitation particles, shapes and orientations of ice crystal particles and the like, so that various macroscopic characteristics and micro-physical characteristics of precipitation can be determined by analyzing and judging precipitation echoes. At present, various theoretical and empirical relations are established between the echo power of precipitation and the precipitation intensity, and by utilizing the relations, the precipitation intensity distribution and the total precipitation in the radar detection range can be measured according to the echo power. When the strength of a meteorological target in a detection space is weaker than a certain threshold value, after electromagnetic waves transmitted by a radar are absorbed and scattered by the meteorological target, the scattered echo power received by the radar is very weak, and when the strength of the meteorological target in the detection space is lower than the sensitivity (minimum measurable power) of a receiver, the radar cannot detect the weak meteorological target in the space.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for detecting a weak meteorological target, so as to solve the problem that the existing radar meteorological detection method cannot detect the weak meteorological target.
The second objective of the present invention is to provide an electronic device to solve the problem that the existing radar weather detection method cannot detect the weak weather target.
One of the purposes of the invention is realized by adopting the following technical scheme:
a method of detecting a meteorologic target, comprising:
acquiring a current angle of a radar and transmission power of electromagnetic waves transmitted by the radar;
acquiring first reflection power of the electromagnetic wave reflected by a fixed reflector under the current meteorological condition;
and judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power.
Further, the determining the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power includes:
calculating atmospheric two-way loss under the current meteorological condition according to the first reflection power and second reflection power corresponding to the same transmission power under the clear air condition;
and judging the type of the weak meteorological target of the space corresponding to the current angle of the radar according to the atmospheric two-way loss under the current meteorological condition.
Further, the calculating the atmospheric two-way loss under the current meteorological condition according to the first reflected power and the second reflected power corresponding to the same transmitting power under the clear air condition includes:
according to the formula
Figure BDA0001446255140000021
Calculating the atmospheric two-way loss under the current meteorological conditions, wherein LatwFor atmospheric two-way losses under current meteorological conditions, PrIs the second reflected power, PrwIs the first reflected power, C is the radar constant under clear sky conditions, CwIs the radar constant under current meteorological conditions, R is the distance from the radar to the stationary reflector, LatThe atmospheric two-way loss is under the clear sky condition.
Further, the obtaining a current angle of the radar and a transmission power of an electromagnetic wave transmitted by the radar further includes:
and adjusting radar parameters to ensure that the reflected wave of the electromagnetic wave can not cause the high-end saturation of the receiver under the clear air condition and the current condition.
Further, the radar parameters comprise antenna rotation speed, pitching angle, emission pulse power, pulse repetition frequency and sampling point number.
The second purpose of the invention is realized by adopting the following technical scheme:
an electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing:
acquiring a current angle of a radar and transmission power of electromagnetic waves transmitted by the radar;
acquiring first reflection power of the electromagnetic wave reflected by a fixed reflector under the current meteorological condition;
and judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power.
Further, the program is also for executing:
calculating atmospheric two-way loss under the current meteorological condition according to the first reflection power and second reflection power corresponding to the same transmission power under the clear air condition;
and judging the type of the weak meteorological target of the space corresponding to the current angle of the radar according to the atmospheric two-way loss under the current meteorological condition.
Further, the program is also for executing:
according to the formula
Figure BDA0001446255140000031
Calculating the atmospheric two-way loss under the current meteorological conditions, wherein LatwFor atmospheric two-way losses under current meteorological conditions, PrIs the second reflected power, PrwIs the first reflected power, C is the radar constant under clear sky conditions, CwIs the radar constant under current meteorological conditions, R is the distance from the radar to the stationary reflector, LatThe atmospheric two-way loss is under the clear sky condition.
Further, the program is also for executing:
and adjusting radar parameters to ensure that the reflected wave of the electromagnetic wave can not cause the high-end saturation of the receiver under the clear air condition and the current condition.
The invention also relates to a computer-readable storage medium, on which a computer program is stored, which computer program is executed by a processor for the above-mentioned method.
Compared with the prior art, the invention has the beneficial effects that: the type of the weak meteorological target in the space corresponding to the current angle of the radar is judged through the transmitting power of the electromagnetic wave and the first reflected power of the electromagnetic wave after being reflected by the fixed reflector, and the type of the weak meteorological target in the space corresponding to each angle of the radar can be detected by changing the angle of the radar.
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FIG. 1 is a schematic diagram of a device for detecting a meteorologic target according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for detecting a Weak weather target according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The method for detecting the weak meteorological target needs to collect a sample and establish a database before detection, and specifically comprises the following steps: under the clear air condition, setting the rotation speed and the angle of an antenna of a radar, starting the radar to carry out omnibearing scanning, recording the angle of the radar and the transmitting power of electromagnetic waves corresponding to each angle, as shown in figure 1, arranging a fixed reflector 2 at the corresponding position of the set angle of the radar 1, and recording the reflecting power of the electromagnetic waves corresponding to each angle and reflected by the fixed reflector 2; respectively changing the antenna rotating speed, the radar angle and the electromagnetic wave transmitting power, and recording the corresponding reflected power under the conditions of various antenna rotating speeds, various radar angles and various electromagnetic wave transmitting powers; under the condition that a known weak meteorological target exists, under the conditions of the antenna rotating speed, the radar angle, the electromagnetic wave transmitting power and the position of the same fixed reflector corresponding to the clear sky condition, the reflecting power of the electromagnetic wave reflected by the fixed reflector 2 corresponding to each angle under various weak meteorological conditions is recorded, and a database is established.
As shown in fig. 2, the method for detecting a weak meteorological target according to an embodiment of the present invention includes:
step S101: and acquiring the current angle of the radar and the transmitting power of the electromagnetic wave transmitted by the radar.
Specifically, the angle of the radar, the rotational speed of the antenna, and the transmission power of the electromagnetic wave are adjusted to correspond to one detection condition in the database, and the angle and the transmission power parameters are recorded.
Step S102: and acquiring first reflection power of the electromagnetic wave after being reflected by the fixed reflector under the current meteorological condition.
Specifically, a receiving antenna of the radar receives electromagnetic waves reflected by a fixed reflector, and a receiver records reflected power, i.e., first reflected power.
Step S103: and judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power.
The method comprises the following steps:
step S1031: calculating atmospheric two-way loss under the current meteorological condition according to the first reflection power and second reflection power corresponding to the same transmission power under the clear air condition;
specifically, the second reflected power under the clear sky condition corresponding to the detection condition of the first reflected power is found out from the database, and the formula is used for
Figure BDA0001446255140000051
Calculating the atmospheric two-way loss under the current meteorological conditions, wherein LatwFor atmospheric two-way losses under current meteorological conditions, PrIs the second reflected power, PrwIs the first reflected power, C is the radar constant under clear sky conditions, CwIs the radar constant under current meteorological conditions, R is the distance from the radar to the stationary reflector, LatThe atmospheric two-way loss under the clear sky condition is an empirical value. Wherein, the calculation formula of R is as follows:
Figure BDA0001446255140000052
where c is the propagation velocity of the electromagnetic wave, tRThe time elapsed from the emission of the electromagnetic wave to the reception of the reflected electromagnetic wave.
C is set according to a reflectivity factor formula of the radar detection echo, and the reflectivity factor formula of the radar detection echo is as follows:
Figure BDA0001446255140000061
wherein λ is the wavelength of the electromagnetic wave, G is the gain of the antenna, and P istTo transmit the pulse power, τ is the pulse width, θ is the horizontal beam width,phi is the vertical beam width, LΣRemove L for the systematTotal loss of the outer, PrIs the input signal power.
Taking into account antenna gain and matched filter loss, the radar constant C is
Figure BDA0001446255140000062
Wherein L ispTo match the filter loss. CwThe setting process of (2) is the same as that of (C).
Step S1032: and judging the type of the weak meteorological target of the space corresponding to the current angle of the radar according to the atmospheric two-way loss under the current meteorological condition.
Specifically, the type of the meteorology target corresponding to the same atmospheric two-way loss is found in the database, so that the type of the meteorology target under the current meteorological condition can be judged. The angle of the radar is changed, and the type of the weak meteorological target in the space corresponding to the radar can be judged by the same detection and calculation method, so that the type of the weak meteorological target in each direction is judged. And according to the detection and calculation results of the whole volume, judging the overall form, the generation and elimination trend, the movement trend and the like of the current meteorological echo.
As a preferred embodiment, before acquiring the current angle of the radar and the transmission power of the electromagnetic wave transmitted by the radar, the method further includes: and adjusting radar parameters to ensure that the reflected wave of the electromagnetic wave can not cause high-end saturation of the receiver under clear air conditions and current conditions, wherein the radar parameters comprise antenna rotating speed, pitching angle, transmitted pulse power, pulse repetition frequency and sampling point number.
Specifically, the theoretical calculation process of the reflected power is as follows:
the power of the radar transmitted pulse is PtAnd then, the power density S 'from any point at the radar R'1Comprises the following steps:
Figure BDA0001446255140000071
considering antenna gainGain G, power density S of stationary reflectors at distance R from the radar1Comprises the following steps:
Figure BDA0001446255140000072
density S of reflected power after reflection by a fixed reflector2Is composed of
Figure BDA0001446255140000073
Where σ is the area of the stationary reflector that receives the radar.
Effective area of radar receiving reflected power is AeThen the reflected power received by the radar is
Figure BDA0001446255140000074
The antenna gain and the effective area have the following relationship:
Figure BDA0001446255140000075
therefore, the temperature of the molten metal is controlled,
Figure BDA0001446255140000076
if the reflected power exceeds the dynamic range of the radar receiver, the receiver can be saturated, radar parameters are adjusted according to the theoretical reflected power value and the actual received reflected power, the reflected wave of the electromagnetic wave can not cause the high-end saturation of the receiver under the clear air condition, and the accuracy of detection and calculation is increased.
As shown in fig. 3, an electronic device provided in an embodiment of the present invention includes: a processor 11;
a memory 12; and a program, wherein the program is stored in the memory 12 and configured to be executed by the processor 11, the program comprising instructions for performing:
acquiring a current angle of a radar and transmission power of electromagnetic waves transmitted by the radar;
acquiring first reflection power of the electromagnetic wave reflected by a fixed reflector under the current meteorological condition;
and judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power.
Further, the program is also for executing:
calculating atmospheric two-way loss under the current meteorological condition according to the first reflection power and second reflection power corresponding to the same transmission power under the clear air condition;
and judging the type of the weak meteorological target of the space corresponding to the current angle of the radar according to the atmospheric two-way loss under the current meteorological condition.
Further, the program is also for executing:
according to the formula
Figure BDA0001446255140000081
Calculating the atmospheric two-way loss under the current meteorological conditions, wherein LatwFor atmospheric two-way losses under current meteorological conditions, PrIs the second reflected power, PrwIs the first reflected power, C is the radar constant under clear sky conditions, CwIs the radar constant under current meteorological conditions, R is the distance from the radar to the stationary reflector, LatThe atmospheric two-way loss is under the clear sky condition.
Further, the program is also for executing:
and adjusting radar parameters to ensure that the reflected wave of the electromagnetic wave can not cause the high-end saturation of the receiver under the clear air condition and the current condition.
The electronic device in this embodiment and the method in the foregoing embodiment are based on two aspects of the same inventive concept, and the detailed description of the implementation process of the method has been described in the foregoing, so that those skilled in the art can clearly understand the implementation process of the electronic device in this embodiment according to the foregoing description, and for the brevity of the description, details are not repeated here.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on this understanding, the technical solutions of the present invention may be embodied in the form of software products, which essentially or partially contribute to the prior art. The invention also relates to a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., having stored thereon a computer program for being executed by a processor for performing the above-mentioned method.
The method, the electronic equipment and the storage medium for detecting the meteorologic target provided by the invention can judge the type of the meteorologic target in the space corresponding to the current angle of the radar through the transmitting power of the electromagnetic wave and the first reflected power of the electromagnetic wave reflected by the fixed reflector, and can detect the type of the meteorologic target in the space corresponding to each angle of the radar by changing the angle of the radar.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (8)

1. A method for detecting a meteorologic target, comprising:
under the clear sky condition, setting the antenna rotation speed and the radar angle of a radar, starting the radar to carry out all-dimensional scanning, recording the radar angle and the electromagnetic wave transmitting power corresponding to each angle, arranging a fixed reflector at the position corresponding to the set angle of the radar, and recording the reflecting power of the electromagnetic wave reflected by the fixed reflector corresponding to each angle;
under the condition that a known weak meteorological target exists, under the conditions of the antenna rotating speed, the radar angle, the electromagnetic wave transmitting power and the position of the same fixed reflector corresponding to a clear sky condition, recording the reflecting power of the electromagnetic wave reflected by the fixed reflector corresponding to each angle under various weak meteorological conditions, and establishing a database;
acquiring the current angle of the radar and the transmitting power of the electromagnetic wave transmitted by the radar;
acquiring first reflection power of the electromagnetic wave reflected by the fixed reflector under the current meteorological condition;
judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power, specifically comprising the following steps: calculating atmospheric two-way loss under the current meteorological condition according to the first reflection power and second reflection power corresponding to the same transmission power under the clear air condition;
judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the atmospheric two-way loss under the current meteorological condition, specifically comprising the following steps: and finding out the type of the meteorologic target corresponding to the same atmospheric two-way loss in the database.
2. The method for detecting a meteorologic target according to claim 1, wherein the calculating atmospheric two-way loss under the current meteorological condition according to the first reflected power and a second reflected power corresponding to the same transmitting power under clear air conditions comprises:
according to the formula
Figure FDA0003113486100000011
Calculating the atmospheric two-way loss under the current meteorological conditions, wherein LatwFor atmospheric two-way losses under current meteorological conditions, PrIs the second reflected power, PrwIs the first reflected power, C is the radar constant under clear sky conditions, CwIs the radar constant under current meteorological conditions, R is the distance from the radar to the stationary reflector, LatThe atmospheric two-way loss is under the clear sky condition.
3. The method for detecting a Weak weather target according to claim 1, wherein said obtaining a current angle of a radar and a transmission power of an electromagnetic wave transmitted by said radar further comprises:
and adjusting radar parameters to ensure that the reflected wave of the electromagnetic wave can not cause the high-end saturation of the receiver under the clear air condition and the current condition.
4. A method of detecting a meteorologic target according to claim 3, wherein the radar parameters include antenna speed, pitch angle, transmitted pulse power, pulse repetition frequency and number of sampling points.
5. An electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing:
under the clear sky condition, setting the antenna rotation speed and the radar angle of a radar, starting the radar to carry out all-dimensional scanning, recording the radar angle and the electromagnetic wave transmitting power corresponding to each angle, arranging a fixed reflector at the position corresponding to the set angle of the radar, and recording the reflecting power of the electromagnetic wave reflected by the fixed reflector corresponding to each angle;
under the condition that a known weak meteorological target exists, under the conditions of the antenna rotating speed, the radar angle, the electromagnetic wave transmitting power and the position of the same fixed reflector corresponding to a clear sky condition, recording the reflecting power of the electromagnetic wave reflected by the fixed reflector corresponding to each angle under various weak meteorological conditions, and establishing a database;
acquiring the current angle of the radar and the transmitting power of the electromagnetic wave transmitted by the radar;
acquiring first reflection power of the electromagnetic wave reflected by the fixed reflector under the current meteorological condition;
judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the transmitting power and the first reflected power, specifically comprising the following steps: calculating atmospheric two-way loss under the current meteorological condition according to the first reflection power and second reflection power corresponding to the same transmission power under the clear air condition;
judging the type of the weak meteorological target in the space corresponding to the current angle of the radar according to the atmospheric two-way loss under the current meteorological condition, specifically comprising the following steps: and finding out the type of the meteorologic target corresponding to the same atmospheric two-way loss in the database.
6. The electronic device according to claim 5, wherein the program is further configured to execute:
according to the formula
Figure FDA0003113486100000031
Calculating the atmospheric two-way loss under the current meteorological conditions, wherein LatwFor atmospheric two-way losses under current meteorological conditions, PrIs the second reflected power, PrwIs the first reflected power, C is the radar constant under clear sky conditions, CwIs the radar constant under current meteorological conditions, R is the distance from the radar to the stationary reflector, LatThe atmospheric two-way loss is under the clear sky condition.
7. The electronic device according to claim 5, wherein the program is further configured to execute:
and adjusting radar parameters to ensure that the reflected wave of the electromagnetic wave can not cause the high-end saturation of the receiver under the clear air condition and the current condition.
8. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor for performing the method according to any of claims 1-4.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103645477A (en) * 2013-12-04 2014-03-19 中国气象局气象探测中心 Method and system for meteorological-radar signal processing
CN104360329A (en) * 2014-11-15 2015-02-18 安徽四创电子股份有限公司 Intensity calibrating method of all-digital array phased-array weather radar
JP2017003539A (en) * 2015-06-16 2017-01-05 三菱電機株式会社 Meteorological radar device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103645477A (en) * 2013-12-04 2014-03-19 中国气象局气象探测中心 Method and system for meteorological-radar signal processing
CN104360329A (en) * 2014-11-15 2015-02-18 安徽四创电子股份有限公司 Intensity calibrating method of all-digital array phased-array weather radar
JP2017003539A (en) * 2015-06-16 2017-01-05 三菱電機株式会社 Meteorological radar device

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