CN116299248A - Weather radar signal processor calibration system and calibration method - Google Patents
Weather radar signal processor calibration system and calibration method Download PDFInfo
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- 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
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- 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
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Abstract
The invention discloses a weather radar signal processor calibration system and a calibration method, which relate to the technical field of signal processor calibration, wherein the calibration system comprises: the ADC digital-analog conversion module is used for converting an analog signal into a digital signal; the DAC digital-to-analog conversion module is used for converting a digital signal into an analog signal; the FPGA module is used for realizing the digital signal processing process required in the whole calibration test process; based on the calibration system, a brand new calibration method is provided; the invention not only can make up the defects of the traditional testing method, but also can improve the accuracy and the effectiveness of meteorological products by restoring the echo IQ signal of the classical weather process into an intermediate frequency signal and inputting the intermediate frequency signal into the weather radar signal processor to be tested and testing the capability of the weather radar signal processor to be tested to cope with various weather processes.
Description
Technical Field
The invention relates to the technical field of signal processor calibration, in particular to a weather radar signal processor calibration system and a weather radar signal processor calibration method.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Because the meteorological targets are complex and various and change rapidly, the meteorological radar needs to have the detection characteristics of real time, accuracy and large dynamic range, and the signal processor is used as a core component of the meteorological radar, so that the requirements on technical indexes are strict.
The traditional test and measurement method of the signal processor is based on test and measurement instruments such as a signal source, a frequency spectrograph, an oscilloscope and the like, and various technical indexes of the signal processor are calibrated.
Disclosure of Invention
The invention aims at: aiming at the problems that the performance of a signal processor can be accurately estimated but the state of the signal processor in a real working environment cannot be obtained in the conventional test method of the signal processor, the weather radar signal processor calibration system and the weather radar signal processor calibration method are provided, the defects of the conventional test method can be overcome, an echo IQ signal of a classical weather process can be restored to an intermediate frequency signal and then input to the weather radar signal processor to be tested, the capability of the weather radar signal processor to be tested for coping with various weather processes is tested, and the accuracy and the effectiveness of weather products are improved, so that the problems are solved.
The technical scheme of the invention is as follows:
a weather radar signal processor calibration system, comprising:
the ADC digital-analog conversion module is used for converting an analog signal into a digital signal;
the DAC digital-to-analog conversion module is used for converting a digital signal into an analog signal;
and the FPGA module is used for realizing the digital signal processing process required in the whole calibration test process.
Further, the signal processor calibration system is respectively communicated with a weather radar signal processor to be calibrated and a calibration system control terminal; the intermediate frequency excitation signal generated by the weather radar signal processor to be calibrated can be transmitted to the signal processor calibration system, and the calibration signal generated by the signal processor calibration system can be transmitted to the weather radar signal processor to be calibrated; the calibration system control terminal can transmit a control command to the signal processor calibration system, and a baseband IQ signal generated by the signal processor calibration system can be transmitted to the calibration system control terminal;
the calibration system control terminal is also communicated with the signal processor control terminal; the calibration system control terminal can transmit a control command to the signal processor control terminal, and the signal processor control terminal can transmit a primary weather product result to the calibration system control terminal;
the signal processor control terminal is also communicated with a weather radar signal processor to be calibrated; the signal processor control terminal can transmit a control instruction to the weather radar signal processor to be calibrated, and the weather radar signal processor to be calibrated can transmit the generated IQ signal to the signal processor control terminal.
Further, the ADC digital-analog conversion module can quantize an intermediate frequency excitation signal with known pulse width and repetition frequency generated by a weather radar signal processor to be calibrated into a digital signal;
the FPGA module can perform first digital signal processing on the digital signals to obtain baseband IQ signals;
the first digital signal processing includes: down-conversion, filtering and decimation.
Further, the system also comprises an upper computer, wherein the upper computer receives the baseband IQ signal and calculates to obtain parameters of an intermediate frequency signal generated by a weather radar signal processor to be calibrated;
the parameters include: power, frequency spectrum, phase noise, pulse width, pulse repetition frequency, pulse rising edge, pulse falling edge, and pulse top drop.
Further, the FPGA module may further perform a second digital signal processing on the baseband IQ signal to obtain an intermediate frequency digital signal;
the DAC digital-to-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change;
the second digital signal processing includes: phase shifting, amplitude modulation, delay, up-conversion.
Further, the calibration system control terminal sends a control instruction to the signal processor control terminal, and the signal processor control terminal controls the weather radar signal processor to be calibrated to generate an intermediate frequency excitation signal with known pulse width and repetition frequency;
the intermediate frequency excitation signal is transmitted to a signal processor calibration system, the ADC digital-analog conversion module quantizes the intermediate frequency excitation signal into a digital signal, and the FPGA module performs first digital signal processing on the digital signal to obtain a baseband IQ signal;
and the upper computer receives the baseband IQ signal and calculates to obtain parameters of the intermediate frequency signal generated by the weather radar signal processor to be calibrated.
Further, the FPGA module carries out second digital signal processing on the baseband IQ signal to obtain an intermediate frequency digital signal;
the DAC digital-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change, and loops the intermediate frequency signal to a weather radar signal processor to be calibrated, the weather radar signal processor to be calibrated carries out signal processing on the intermediate frequency signal to output an IQ signal to a signal processor control terminal, the signal processor control terminal carries out calculation to obtain a primary weather product, the primary weather product is transmitted to a calibration system control terminal, and the calibration system control terminal can acquire the processing capacity of the weather radar signal processor to be calibrated according to the primary weather product;
the processing capability includes: spectral width calibration capability, ground object suppression capability, ranging capability, intensity calibration capability, and speed calibration capability.
Further, the calibration system control terminal sends an IQ signal of a section of typical weather echo in an original weather product to a signal processor calibration system, the FPGA module performs third-time digital signal processing to generate an intermediate frequency signal, the intermediate frequency signal is sent to a weather radar signal processor to be calibrated, and the processing capacity of the weather radar signal processor to be calibrated for echo signals of complex weather processes can be calibrated by comparing the weather product generated by the weather radar signal processor to be calibrated with the original weather product;
the third digital signal comprises: up-conversion.
A weather radar signal processor calibration method based on the weather radar signal processor calibration system comprises the following steps:
step S1: setting up a calibration environment based on a weather radar signal processor to be calibrated, a signal processor calibration system, a calibration system control terminal, a signal processor control terminal and an upper computer;
step S2: the calibration system control terminal sends a control instruction to the signal processor control terminal, the signal processor control terminal controls the weather radar signal processor to be calibrated to generate an intermediate frequency excitation signal with known pulse width and repetition frequency, the intermediate frequency excitation signal is transmitted to the signal processor calibration system and is converted into a baseband IQ signal, and the upper computer receives the baseband IQ signal and calculates to obtain parameters of the intermediate frequency signal generated by the weather radar signal processor to be calibrated;
step S3: the signal processor calibration system converts the baseband IQ signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change, and loops the intermediate frequency signal to a weather radar signal processor to be calibrated, the weather radar signal processor to be calibrated carries out signal processing on the intermediate frequency signal to output an IQ signal to a signal processor control terminal, the signal processor control terminal carries out calculation to obtain a primary weather product, the primary weather product is transmitted to a calibration system control terminal, and the calibration system control terminal can acquire the processing capacity of the weather radar signal processor to be calibrated according to the primary weather product;
step S4: the calibration system control terminal sends an IQ signal of a section of typical weather echo in the original weather product to the signal processor calibration system, the signal processor calibration system generates an intermediate frequency signal and sends the intermediate frequency signal to the weather radar signal processor to be calibrated, and the processing capacity of the weather radar signal processor to be calibrated for echo signals of complex weather processes can be calibrated by comparing the weather product generated by the weather radar signal processor to be calibrated with the original weather product.
Further, the step S1 includes:
the signal processor calibration system is respectively communicated with a weather radar signal processor to be calibrated and a calibration system control terminal; the calibration system control terminal is also communicated with the signal processor control terminal; the signal processor control terminal is also communicated with a weather radar signal processor to be calibrated; the upper computer is communicated with the signal processor calibration system;
the step S2 includes:
the intermediate frequency excitation signal is transmitted to a signal processor calibration system, the ADC digital-analog conversion module quantizes the intermediate frequency excitation signal into a digital signal, and the FPGA module performs first digital signal processing on the digital signal to obtain a baseband IQ signal;
the step S3 includes:
performing second digital signal processing on the baseband IQ signal through an FPGA module to obtain an intermediate frequency digital signal; the DAC digital-to-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change;
the step S4 includes:
and performing third digital signal processing on the IQ signals of the typical weather echo through the FPGA module, generating intermediate frequency signals, and transmitting the intermediate frequency signals to a weather radar signal processor to be calibrated.
Compared with the prior art, the invention has the beneficial effects that:
1. a weather radar signal processor calibration system and a calibration method can effectively calibrate the signal quality of intermediate frequency excitation signals generated by weather radar signal processors of various types and the processing capacity of receiving various changed signals.
2. A weather radar signal processor calibration system and a calibration method can play back various typical weather echo signals, simulate typical weather processes, and strengthen the capability of the weather radar signal processor to cope with various weather processes.
3. A weather radar signal processor calibration system can be matched with a radio frequency module and an antenna module to form a calibration system supporting weather radar of various types and wave bands.
4. A weather radar signal processor calibration system and a calibration method are based on a simple combination of AD, DA, FPGA, and have the advantages of low cost and strong product replicability.
5. A weather radar signal processor calibration system and a calibration method make up for the defect that the conventional test method of the weather radar signal processor lacks practical application scene verification.
Drawings
FIG. 1 is a schematic diagram of the connection of a weather radar signal processor calibration system during calibration;
FIG. 2 is a functional block diagram of a weather radar signal processor calibration system.
Detailed Description
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and capabilities of the present invention are described in further detail below in connection with examples.
Example 1
A weather radar signal processor calibration system specifically comprises:
the ADC digital-analog conversion module is used for converting an analog signal into a digital signal;
the DAC digital-to-analog conversion module is used for converting a digital signal into an analog signal;
and the FPGA module is used for realizing the digital signal processing process required in the whole calibration test process.
In this embodiment, specifically, as shown in fig. 1, the signal processor calibration system communicates with a weather radar signal processor to be calibrated and a calibration system control terminal respectively; the intermediate frequency excitation signal generated by the weather radar signal processor to be calibrated can be transmitted to the signal processor calibration system, and the calibration signal generated by the signal processor calibration system can be transmitted to the weather radar signal processor to be calibrated; the calibration system control terminal can transmit a control command to the signal processor calibration system, and a baseband IQ signal generated by the signal processor calibration system can be transmitted to the calibration system control terminal; preferably, the signal processor calibration system is connected with the weather radar signal processor to be calibrated through an SMA cable, and the signal processor calibration system is connected with a calibration system control terminal through a network cable;
the calibration system control terminal is also communicated with the signal processor control terminal; the calibration system control terminal can transmit a control command to the signal processor control terminal, and the signal processor control terminal can transmit a primary weather product result to the calibration system control terminal; preferably, the calibration system control terminal is connected with the signal processor control terminal through a network cable;
the signal processor control terminal is also communicated with a weather radar signal processor to be calibrated; the signal processor control terminal can transmit a control instruction to a weather radar signal processor to be calibrated, and the weather radar signal processor to be calibrated can transmit the generated IQ signal to the signal processor control terminal; preferably, the signal processor control terminal is connected with the weather radar signal processor to be calibrated through an optical fiber.
In this embodiment, specifically, the ADC digital-to-analog conversion module may quantize the intermediate frequency excitation signal with known pulse width and repetition frequency generated by the weather radar signal processor to be calibrated into a digital signal;
the FPGA module can perform first digital signal processing on the digital signals to obtain baseband IQ signals;
the first digital signal processing includes: down-conversion, filtering and decimation.
In this embodiment, the system specifically further includes an upper computer, where the upper computer receives the baseband IQ signal and performs calculation to obtain parameters of an intermediate frequency signal generated by the weather radar signal processor to be calibrated; preferably, the upper computer is connected with the signal processor calibration system through a 4G or 5G network;
the parameters include: power, frequency spectrum, phase noise, pulse width, pulse repetition frequency, pulse rising edge, pulse falling edge, and pulse top drop.
In this embodiment, specifically, the FPGA module may further perform second digital signal processing on the baseband IQ signal to obtain an intermediate frequency digital signal;
the DAC digital-to-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change;
the second digital signal processing includes: phase shifting, amplitude modulation, delay and up-conversion;
in this embodiment, specifically, the calibration system control terminal sends a control instruction to the signal processor control terminal, where the signal processor control terminal controls the weather radar signal processor to be calibrated to generate an intermediate frequency excitation signal with known pulse width and repetition frequency;
the intermediate frequency excitation signal is transmitted to a signal processor calibration system, the ADC digital-analog conversion module quantizes the intermediate frequency excitation signal into a digital signal, and the FPGA module performs first digital signal processing on the digital signal to obtain a baseband IQ signal;
and the upper computer receives the baseband IQ signal and calculates to obtain parameters of the intermediate frequency signal generated by the weather radar signal processor to be calibrated.
In this embodiment, specifically, the FPGA module performs second digital signal processing on the baseband IQ signal to obtain an intermediate frequency digital signal;
the DAC digital-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change, and loops the intermediate frequency signal to a weather radar signal processor to be calibrated, the weather radar signal processor to be calibrated carries out signal processing on the intermediate frequency signal to output an IQ signal to a signal processor control terminal, the signal processor control terminal carries out calculation to obtain a primary weather product, the primary weather product is transmitted to a calibration system control terminal, and the calibration system control terminal can acquire the processing capacity of the weather radar signal processor to be calibrated according to the primary weather product;
the processing capability includes: spectral width calibration capability, ground object suppression capability, ranging capability, intensity calibration capability, and speed calibration capability.
In this embodiment, specifically, the calibration system control terminal sends an IQ signal of a section of typical weather echo in the original weather product to the signal processor calibration system, the FPGA module performs third digital signal processing to generate an intermediate frequency signal, and sends the intermediate frequency signal to the weather radar signal processor to be calibrated, and the processing capability of the weather radar signal processor to be calibrated for echo signals of complex weather processes can be calibrated by comparing the weather product generated by the weather radar signal processor to be calibrated with the original weather product; in the calibration process, an IQ signal of a section of typical meteorological echo in an original meteorological product is stored in a control terminal of a calibration system;
the third digital signal comprises: up-conversion.
Referring to fig. 1-2, a weather radar signal processor calibration method, based on the above-mentioned weather radar signal processor calibration system, includes:
step S1: setting up a calibration environment based on a weather radar signal processor to be calibrated, a signal processor calibration system, a calibration system control terminal, a signal processor control terminal and an upper computer;
step S2: the calibration system control terminal sends a control instruction to the signal processor control terminal, the signal processor control terminal controls the weather radar signal processor to be calibrated to generate an intermediate frequency excitation signal with known pulse width and repetition frequency, the intermediate frequency excitation signal is transmitted to the signal processor calibration system and is converted into a baseband IQ signal, and the upper computer receives the baseband IQ signal and calculates to obtain parameters of the intermediate frequency signal generated by the weather radar signal processor to be calibrated;
step S3: the signal processor calibration system converts the baseband IQ signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change, and loops the intermediate frequency signal to a weather radar signal processor to be calibrated, the weather radar signal processor to be calibrated carries out signal processing on the intermediate frequency signal to output an IQ signal to a signal processor control terminal, the signal processor control terminal carries out calculation to obtain a primary weather product, the primary weather product is transmitted to a calibration system control terminal, and the calibration system control terminal can acquire the processing capacity of the weather radar signal processor to be calibrated according to the primary weather product;
step S4: the calibration system control terminal sends an IQ signal of a section of typical weather echo in the original weather product to the signal processor calibration system, the signal processor calibration system generates an intermediate frequency signal and sends the intermediate frequency signal to the weather radar signal processor to be calibrated, and the processing capacity of the weather radar signal processor to be calibrated for echo signals of complex weather processes can be calibrated by comparing the weather product generated by the weather radar signal processor to be calibrated with the original weather product.
In this embodiment, specifically, the step S1 includes:
the signal processor calibration system is respectively communicated with a weather radar signal processor to be calibrated and a calibration system control terminal; the calibration system control terminal is also communicated with the signal processor control terminal; the signal processor control terminal is also communicated with a weather radar signal processor to be calibrated; the upper computer is communicated with the signal processor calibration system;
the step S2 includes:
the intermediate frequency excitation signal is transmitted to a signal processor calibration system, the ADC digital-analog conversion module quantizes the intermediate frequency excitation signal into a digital signal, and the FPGA module performs first digital signal processing on the digital signal to obtain a baseband IQ signal;
the step S3 includes:
performing second digital signal processing on the baseband IQ signal through an FPGA module to obtain an intermediate frequency digital signal; the DAC digital-to-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change;
the step S4 includes:
and performing third digital signal processing on the IQ signals of the typical weather echo through the FPGA module, generating intermediate frequency signals, and transmitting the intermediate frequency signals to a weather radar signal processor to be calibrated.
The foregoing examples merely represent specific embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, which fall within the protection scope of the present application.
This background section is provided to generally present the context of the present invention and the work of the presently named inventors, to the extent it is described in this background section, as well as the description of the present section as not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present invention.
Claims (10)
1. A weather radar signal processor calibration system, comprising:
the ADC digital-analog conversion module is used for converting an analog signal into a digital signal;
the DAC digital-to-analog conversion module is used for converting a digital signal into an analog signal;
and the FPGA module is used for realizing the digital signal processing process required in the whole calibration test process.
2. The weather radar signal processor calibration system of claim 1, wherein the signal processor calibration system is in communication with a weather radar signal processor to be calibrated and a calibration system control terminal, respectively; the intermediate frequency excitation signal generated by the weather radar signal processor to be calibrated can be transmitted to the signal processor calibration system, and the calibration signal generated by the signal processor calibration system can be transmitted to the weather radar signal processor to be calibrated; the calibration system control terminal can transmit a control command to the signal processor calibration system, and a baseband IQ signal generated by the signal processor calibration system can be transmitted to the calibration system control terminal;
the calibration system control terminal is also communicated with the signal processor control terminal; the calibration system control terminal can transmit a control command to the signal processor control terminal, and the signal processor control terminal can transmit a primary weather product result to the calibration system control terminal;
the signal processor control terminal is also communicated with a weather radar signal processor to be calibrated; the signal processor control terminal can transmit a control instruction to the weather radar signal processor to be calibrated, and the weather radar signal processor to be calibrated can transmit the generated IQ signal to the signal processor control terminal.
3. The weather radar signal processor calibration system of claim 2, wherein the ADC digital-to-analog conversion module is configured to quantize the intermediate frequency excitation signal with known pulse width and repetition frequency generated by the weather radar signal processor to be calibrated into a digital signal;
the FPGA module can perform first digital signal processing on the digital signals to obtain baseband IQ signals;
the first digital signal processing includes: down-conversion, filtering and decimation.
4. The weather radar signal processor calibration system according to claim 3, further comprising an upper computer, wherein the upper computer receives baseband IQ signals and calculates the baseband IQ signals to obtain parameters of intermediate frequency signals generated by the weather radar signal processor to be calibrated;
the parameters include: power, frequency spectrum, phase noise, pulse width, pulse repetition frequency, pulse rising edge, pulse falling edge, and pulse top drop.
5. The weather radar signal processor calibration system of claim 4, wherein the FPGA module is further configured to perform a second digital signal processing on the baseband IQ signal to obtain an intermediate frequency digital signal;
the DAC digital-to-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change;
the second digital signal processing includes: phase shifting, amplitude modulation, delay, up-conversion.
6. The weather radar signal processor calibration system of claim 4, wherein the calibration system control terminal sends a control command to the signal processor control terminal, and the signal processor control terminal controls the weather radar signal processor to be calibrated to generate an intermediate frequency excitation signal with known pulse width and repetition frequency;
the intermediate frequency excitation signal is transmitted to a signal processor calibration system, the ADC digital-analog conversion module quantizes the intermediate frequency excitation signal into a digital signal, and the FPGA module performs first digital signal processing on the digital signal to obtain a baseband IQ signal;
and the upper computer receives the baseband IQ signal and calculates to obtain parameters of the intermediate frequency signal generated by the weather radar signal processor to be calibrated.
7. The weather radar signal processor calibration system of claim 6, wherein the FPGA module performs a second digital signal processing on the baseband IQ signal to obtain an intermediate frequency digital signal;
the DAC digital-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change, and loops the intermediate frequency signal to a weather radar signal processor to be calibrated, the weather radar signal processor to be calibrated carries out signal processing on the intermediate frequency signal to output an IQ signal to a signal processor control terminal, the signal processor control terminal carries out calculation to obtain a primary weather product, the primary weather product is transmitted to a calibration system control terminal, and the calibration system control terminal can acquire the processing capacity of the weather radar signal processor to be calibrated according to the primary weather product;
the processing capability includes: spectral width calibration capability, ground object suppression capability, ranging capability, intensity calibration capability, and speed calibration capability.
8. The weather radar signal processor calibration system according to claim 2, wherein the calibration system control terminal transmits IQ signals of a section of typical weather echo in the original weather product to the signal processor calibration system, generates intermediate frequency signals after third digital signal processing by the FPGA module, and transmits the intermediate frequency signals to the weather radar signal processor to be calibrated, and can calibrate the processing capacity of the weather radar signal processor to be calibrated for echo signals of complex weather processes by comparing the weather product generated by the weather radar signal processor to the original weather product;
the third digital signal comprises: up-conversion.
9. A method for calibrating a weather radar signal processor, characterized in that the system is based on any one of claims 1-8, comprising:
step S1: setting up a calibration environment based on a weather radar signal processor to be calibrated, a signal processor calibration system, a calibration system control terminal, a signal processor control terminal and an upper computer;
step S2: the calibration system control terminal sends a control instruction to the signal processor control terminal, the signal processor control terminal controls the weather radar signal processor to be calibrated to generate an intermediate frequency excitation signal with known pulse width and repetition frequency, the intermediate frequency excitation signal is transmitted to the signal processor calibration system and is converted into a baseband IQ signal, and the upper computer receives the baseband IQ signal and calculates to obtain parameters of the intermediate frequency signal generated by the weather radar signal processor to be calibrated;
step S3: the signal processor calibration system converts the baseband IQ signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change, and loops the intermediate frequency signal to a weather radar signal processor to be calibrated, the weather radar signal processor to be calibrated carries out signal processing on the intermediate frequency signal to output an IQ signal to a signal processor control terminal, the signal processor control terminal carries out calculation to obtain a primary weather product, the primary weather product is transmitted to a calibration system control terminal, and the calibration system control terminal can acquire the processing capacity of the weather radar signal processor to be calibrated according to the primary weather product;
step S4: the calibration system control terminal sends an IQ signal of a section of typical weather echo in the original weather product to the signal processor calibration system, the signal processor calibration system generates an intermediate frequency signal and sends the intermediate frequency signal to the weather radar signal processor to be calibrated, and the processing capacity of the weather radar signal processor to be calibrated for echo signals of complex weather processes can be calibrated by comparing the weather product generated by the weather radar signal processor to be calibrated with the original weather product.
10. The method for calibrating a weather radar signal processor according to claim 9, wherein the step S1 includes:
the signal processor calibration system is respectively communicated with a weather radar signal processor to be calibrated and a calibration system control terminal; the calibration system control terminal is also communicated with the signal processor control terminal; the signal processor control terminal is also communicated with a weather radar signal processor to be calibrated; the upper computer is communicated with the signal processor calibration system;
the step S2 includes:
the intermediate frequency excitation signal is transmitted to a signal processor calibration system, the ADC digital-analog conversion module quantizes the intermediate frequency excitation signal into a digital signal, and the FPGA module performs first digital signal processing on the digital signal to obtain a baseband IQ signal;
the step S3 includes:
performing second digital signal processing on the baseband IQ signal through an FPGA module to obtain an intermediate frequency digital signal; the DAC digital-to-analog conversion module converts the intermediate frequency digital signal into an intermediate frequency signal with known phase, amplitude, frequency and delay change;
the step S4 includes:
and performing third digital signal processing on the IQ signals of the typical weather echo through the FPGA module, generating intermediate frequency signals, and transmitting the intermediate frequency signals to a weather radar signal processor to be calibrated.
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