CN209878984U

CN209878984U - Built-in calibration system of phased array weather radar

Info

Publication number: CN209878984U
Application number: CN201920633414.6U
Authority: CN
Inventors: 汤志亚; 舒伟
Original assignee: CHENGDU YUANWANG TECHNOLOGY Co Ltd
Current assignee: CHENGDU YUANWANG TECHNOLOGY Co Ltd
Priority date: 2019-05-06
Filing date: 2019-05-06
Publication date: 2019-12-31
Anticipated expiration: 2029-05-06

Abstract

The utility model discloses a built-in calibration system of phased array weather radar, include: the signal receiving and transmitting assembly is used for signal acquisition and signal output after calibration; the calibration unit is used for generating an excitation signal and sending the excitation signal to the signal transceiving component; and the data processing end is used for calculating the amplitude and phase difference value and the amplitude and phase correction parameters and outputting the calculation result to the signal transceiving component. The utility model discloses can mark range and the phase place of each transmission channel of phased array weather radar's transmitter, also can mark gain and the phase place delay of each receiving channel among the school receiving system, improve the spatial and temporal resolution who surveys weather.

Description

Built-in calibration system of phased array weather radar

Technical Field

The utility model belongs to the technical field of the radar calibration, especially, relate to a calibration system in phased array radar machine.

Background

At present, China is threatened by disastrous weather such as typhoon, tornado, hail, rainstorm and the like every year, and the current new generation of networked radar has the defect of insufficient space-time resolution in the detection and early warning of complex and variable extreme weather, because the early warning time of the disastrous weather is prolonged due to the amplitude deviation and the phase deviation of each transmitting channel of a transmitter of the weather radar.

The phased array radar can scan the whole airspace within dozens of seconds, and can receive and transmit multiple channels simultaneously due to the benefit of the phased array radar, and the multiple channels can acquire and process data simultaneously. In the phased array weather radar, due to multi-channel acquisition, the difference of the output amplitude and the phase of each transmitting channel exists, and the difference of gain and phase delay exists in each channel of a receiving system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a phased array weather radar built-in mark school system just in order to solve above-mentioned problem, include:

the signal receiving and transmitting assembly is used for signal acquisition and signal output after calibration;

the calibration unit is used for generating an excitation signal and sending the excitation signal to the signal transceiving component;

and the data processing end is used for calculating the amplitude and phase difference value and the amplitude and phase correction parameters and outputting the calculation result to the signal transceiving component.

The beneficial effects of the utility model reside in that: the utility model discloses can mark range and the phase place of each transmission channel of phased array weather radar's transmitter, also can mark gain and the phase place delay of each receiving channel among the school receiving system, improve the spatial and temporal resolution who surveys weather.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a system schematic of an embodiment;

FIG. 3 is a schematic diagram of a calibration unit;

fig. 4 is a schematic diagram of a data acquisition unit.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in the accompanying figure 1, the utility model provides a built-in calibration system of phased array weather radar, include:

Furthermore, a power divider is connected between the calibration unit and the signal transceiving component and is used for dividing the excitation signal output by the calibration unit into one path or multiple paths to the signal transceiving component.

Further, a coupling unit for coupling an output signal of the signal transceiver component to the calibration unit is connected between the signal transceiver component and the calibration unit.

Furthermore, the calibration unit comprises an analog-to-digital conversion circuit, an FPGA circuit for amplitude-phase correction, a waveform generation circuit for generating an excitation signal and a data transceiver circuit for data transmission with the data processing end; the output end of the analog-to-digital conversion circuit is connected with the input end of the FPGA circuit; the output end of the FPGA circuit is connected with the waveform generating circuit; the FPGA circuit is connected with the data processing end through a data receiving and sending circuit.

Further, the data processing terminal comprises a local data processor and a terminal processor; the local data processor is used for signal processing and excitation signal control; the terminal processor is used for calculating amplitude, phase value, amplitude difference, phase difference and amplitude-phase correction parameters; the local data processor is in data connection with the terminal processor; and the local data processor is connected with the calibration unit and the signal transceiving component.

Furthermore, a data acquisition unit is connected between the signal receiving and transmitting assembly and the data processing end and used for detecting signal amplitude and phase values.

Calibration process of the transmitting system: the calibration unit generates an excitation signal, the excitation signal passes through the power divider and then is input into a plurality of transmitting signal transceiving components of the phased array radar, the transmitting signal transceiving components respectively amplify and transmit the signal, and the amplified signal is coupled to the directional coupler according to a coupling ratio; the calibration unit collects signals in the directional coupler and uploads the data to the local data processor; the local data processor processes the data and uploads the processed data to the terminal computer; the terminal computer calculates the amplitude and phase values of a plurality of processed transmitting signals, namely transmitting channel data, acquired by the calibration unit, calculates the amplitude difference and the phase difference of each transmitting channel data, compares the amplitude difference and the phase difference with design values of the transmitting channel data, calculates an amplitude correction value and a phase value correction value, and sends the correction parameters to the local data processor; and the calibration unit sends the correction parameters to the transmitting signal transceiving component.

The calibration process of the receiving system: after the calibration of the transmitting system is finished, a plurality of receiving signal assemblies or acquisition channels respectively acquire echo signals output by the signal receiving and transmitting assemblies after the calibration is finished and transmit echo data to a local data processor; the local data processor processes the signals and uploads the signals to the terminal computer; the terminal computer calculates the amplitude and phase values of a plurality of receiving signals, namely receiving channel data, collected by the calibration unit to obtain the amplitude difference and the phase value difference of each channel data, compares the amplitude difference and the phase value difference with the set amplitude and phase value to calculate an amplitude correction parameter and a phase value correction parameter, and then sends the correction parameters to the local data processor to correct the amplitude and the phase of the receiving channel.

As shown in the schematic diagram of the calibration unit shown in fig. 2, the waveform generation circuit generates a transmission excitation signal, outputs the transmission excitation signal to the power divider and divides the signal into each transmission channel, and the analog-to-digital conversion circuit collects the signal output by the directional coupler and then transmits the signal to the FPGA circuit for data processing. The data transceiver circuit receives the data output by the FPGA circuit, serializes the data and transmits the serialized data to the local data processor through the optical fiber; and the local data processor further processes and encapsulates the data and uploads the data to the terminal computer.

The waveform generating circuit comprises a digital frequency synthesis chip and a peripheral circuit thereof, a differential conversion circuit and an amplifier circuit; the FPGA circuit controls the chip to work in an RAM mode and generates waveforms with corresponding frequencies according to the RAM value provided by the FPGA circuit. The waveform generated by the digital frequency synthesis chip is converted into a single end by a differential conversion circuit through a transformer and then is amplified by an amplifier and output to the power divider.

The data transceiver circuit is mainly used for exchanging data with a data processing board, and the circuit can utilize an SFP module to serialize and modulate a large amount of data onto a laser carrier, and high-speed transmission is carried out through an optical fiber. The design adopts a single-mode bidirectional full-duplex SFP laser module.

The data acquisition unit comprises an acquisition channel circuit, a second programmable logic circuit, a clock distribution circuit and a second data receiving and transmitting circuit which are sequentially connected. The acquisition channel circuit is used for acquiring the output detection of the signal transceiving circuit. The output end of the second data receiving and sending circuit is connected with the local data processing processor.

The amplitude and the phase are calculated in a digital mode, and the parameters can be calibrated accurately. The device uses the SFP laser module to match with the single mode fiber to transmit data, thereby enhancing the data transmission distance and the stability and the anti-interference capability of data transmission. The amplitude and phase correction is carried out in a full digital mode, the difficulty in debugging and installation of a large number of similar analog circuits is avoided, and in addition, the device adopts a large-scale integrated circuit device (FPGA), the huge circuit structure of the system is reduced, and the hardware cost of the system is reduced.

The utility model discloses can mark range and the phase place of each transmission channel of phased array weather radar's transmitter, also can mark gain and the phase place delay of each receiving channel among the school receiving system, improve the spatial and temporal resolution who surveys weather.

The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.

Claims

1. The utility model provides a built-in mark school system of phased array weather radar which characterized in that includes:

2. The phased array weather radar built-in calibration system according to claim 1, wherein a power divider is further connected between the calibration unit and the signal transceiver module, and is configured to divide the excitation signal output by the calibration unit into one or more paths to the signal transceiver module.

3. The phased array weather radar built-in calibration system according to claim 1, wherein a coupling unit for coupling an output signal of the signal transceiver module to the calibration unit is further connected between the signal transceiver module and the calibration unit.

4. The phased array weather radar built-in calibration system according to any one of claims 1 to 3, wherein the calibration unit comprises an analog-to-digital conversion circuit, an FPGA circuit for amplitude and phase correction, a waveform generation circuit for generating an excitation signal and a data transceiver circuit for data transmission with a data processing end; the output end of the analog-to-digital conversion circuit is connected with the input end of the FPGA circuit; the output end of the FPGA circuit is connected with the waveform generating circuit; the FPGA circuit is connected with the data processing end through a data receiving and sending circuit.

5. The phased array weather radar built-in calibration system according to claim 1, wherein the data processing end comprises a local data processor and a terminal processor; the local data processor is used for signal processing and excitation signal control; the terminal processor is used for calculating amplitude, phase value, amplitude difference, phase difference and amplitude-phase correction parameters; the local data processor is in data connection with the terminal processor; and the local data processor is connected with the calibration unit and the signal transceiving component.

6. The phased array weather radar built-in calibration system according to claim 1, wherein a data acquisition unit is further connected between the signal transceiving component and the data processing end, and is used for signal amplitude and phase value detection.