CN108983174B - Meteorological radar integrated test equipment - Google Patents
Meteorological radar integrated test equipment Download PDFInfo
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- CN108983174B CN108983174B CN201811224467.9A CN201811224467A CN108983174B CN 108983174 B CN108983174 B CN 108983174B CN 201811224467 A CN201811224467 A CN 201811224467A CN 108983174 B CN108983174 B CN 108983174B
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
Abstract
The invention discloses meteorological radar comprehensive test equipment, which mainly solves the problems of large volume and low peak power measurement precision of the conventional RD-301A comprehensive test equipment. It includes: the radar frequency conversion device comprises a transceiving front end (1), a frequency conversion module (2), a frequency synthesis module (3), a signal processing unit (4), a display control unit (5) and a case panel (7), wherein radar incident signals obtain pulse width, power information and radio frequency signals through the transceiving front end (1), the radio frequency signals are transmitted to the frequency conversion module (2) to be converted into intermediate frequency signals in a down-conversion mode, then the intermediate frequency signals are transmitted to the information processing unit (4) controlled by the display control unit (5) to obtain frequency, repetition frequency and time sequence reference signals, the time sequence reference signals are transmitted to the frequency synthesis module (3), and the frequency synthesis module (3) is controlled to generate delay echo signals and then the delay echo signals are transmitted to the transceiving front end. The invention has small volume, light weight, easy operation, easy maintenance and higher peak power measurement precision, and can be used for index measurement of meteorological radars.
Description
Technical Field
The invention belongs to the technical field of radar testing, and particularly relates to a meteorological radar comprehensive testing device which is used for function testing of an airborne meteorological radar.
Background
At present, new product research and development, production debugging, environmental test, delivery acceptance, routine test and service maintenance of the domestic weather radar are completed by using the RD-301A comprehensive test equipment produced in the United states, and the performance of the RD-301A comprehensive test equipment directly influences the performance of a weather radar system as special function test equipment of the weather radar. The RD-301A comprehensive test equipment generates echo signals with corresponding frequencies according to received radio-frequency signals transmitted by the weather radar, and performs a series of information processing on the radio-frequency signals, so as to complete the following functions: 1. measuring the frequency of a meteorological radar transmitting signal carrier, outputting a same-frequency echo according to a measurement result, and continuously adjusting echo delay, echo frequency, echo pulse width and echo intensity through equipment; 2. measuring the repetition frequency of a meteorological radar transmitting pulse signal; 3. measuring the peak power of a meteorological radar transmitted pulse signal; 4. detecting the pulse envelope information and outputting the pulse envelope information to external test equipment through a BNC interface; 5. the system has a function of outputting six target simulation echoes in a manual mode, wherein parameters such as echo delay, echo frequency, echo pulse width and echo intensity can be set respectively in an individual target mode, the echo delay and the echo pulse width can be adjusted respectively in other target modes, such as 2 targets, 3 targets, 4 targets, 5 targets and 6 targets, and the echo frequency and the echo intensity can be adjusted but are uniform values; 6. and performing power division output on the radio frequency signal input by the tested piece for external spectrum measurement.
The RD-301A comprehensive test equipment is mainly built by discrete devices such as a heterodyne oscillator, a coupler, a differential amplifier, a phase integrator, a voltage-controlled oscillator, an 8.25GHz oscillator, a modulator, a power amplifier, a filter, an automatic gain control board, a power module and the like.
Disclosure of Invention
The invention aims to provide a meteorological radar comprehensive test device aiming at the defects of the prior art so as to reduce the volume and the weight of the meteorological radar special test device and improve the peak power measurement precision.
The technical idea of the invention is as follows: by adopting the modular design, the original six functions of RD-301A are realized, which comprises the following steps: the system comprises a transceiving front end, a frequency conversion module, a frequency synthesis module, a signal processing unit, a display control unit, a power supply module and a case panel;
the first output end O of the transceiving front end 11 And a first input end I of the frequency conversion module 21 Connection of second output terminal O 12 Connected with the panel of the case, and a third output end O thereof 13 Connected with the panel of the case, and a fourth output end O thereof 14 And a second input terminal I of the display control unit 52 Connection of fifth output terminal O 15 Connected with the panel of the case and having a first input terminal I 11 First output end O of frequency synthesizing module 31 Connection of a second input terminal I thereof 12 Connected with the panel of the case, the third output end O 13 And the second input terminal I 12 Are the same end;
the second input end I of the frequency conversion module 22 Second output end O of frequency synthesizer module 32 Connection of the third input terminal I 23 Connected with power supply module, and its fourth input end I 24 And a third output terminal O of the display control unit 53 Connection of first output terminal O 21 And a first input terminal I of the signal processing unit 41 Connection of second output terminal O 22 As local oscillator coupling output, and connected with the case panel; the frequency synthesizer module has a first input end I 31 And a first output terminal O of the display control unit 51 Connection of second input terminal I 32 And a second output terminal O of the signal processing unit 42 Connection of the third input terminal I 33 Is connected with the power supply module;
the second input terminal I of the signal processing unit 42 And a second output terminal O of the display control unit 52 Connection of the third input terminal I 43 Connected with the power supply module and having a first output O 41 And displayFirst input terminal I of control unit 51 Connecting;
the power supply module is respectively connected with the frequency conversion module, the frequency synthesis module, the signal processing unit and the display control unit;
the front panel of the case panel comprises a front panel and a rear panel, the front panel is respectively connected with the transceiving front end and the display control unit, and the rear panel is respectively connected with the frequency conversion module, the signal processing unit and the display control unit.
Furthermore, the transmitting and receiving front end comprises a 30dB attenuator, a circulator, a power divider, a pulse envelope detector, a 12dB attenuator, a combined isolator and a USB power probe, a radar incident signal with the intensity of 50dBm-71.7dBm passes through the attenuation of the 30dB attenuator and the insertion loss of the high-precision circulator in sequence, then is divided into four paths through the power divider, and is output to the pulse envelope detector, the 12dB attenuator, the USB power probe and the rear panel respectively; the signal detected by the pulse envelope detector is output to the front panel, the signal attenuated by the 12dB attenuator is input to the frequency conversion module, and the signal subjected to power measurement by the USB power probe is input to a second input end I of the display control unit 52 。
Further, the frequency conversion module includes: the control interface processing function circuit, the power supply processing function circuit, the PLL circuit and the down-conversion channel; the power supply processing function circuit adjusts the input power supply signal to +5V, +3.3V, +1.2V, and supply power to the internal active device, the control interface processing function circuit controls the PLL circuit to generate local oscillation signals, the local oscillation signals are divided into two paths, one path enters a down-conversion channel to be mixed with the radio frequency input signals transmitted to the frequency conversion module by the receiving and transmitting front end, the mixed intermediate frequency signals are transmitted to the signal processing unit in an RS422 locking information mode, and the other path is used as local oscillation coupling output to be connected with the chassis panel.
Further, the frequency synthesizer module comprises: the control interface processing circuit, the power supply processing circuit, the clock signal generating circuit, the carrier power dividing circuit and the modulation link circuit are connected in series; the control interface processing circuit comprises a differential level conversion circuit and an FPGA circuit, and is used for analyzing an RS422 interface software command and converting the control command into an actual operation command, the operation command directly controls carrier power and carrier frequency, the operation command controls echo signal delay by combining with a time sequence reference signal output by the information processing unit, the power supply processing circuit adjusts an input power supply signal to +5V, +3.3V, +1.2V and-5V and supplies power to each circuit, the clock signal generating circuit generates a 120MHz clock signal and divides the clock signal into two paths, the first path of the 120MHz signal is amplified and filtered and then output to the frequency conversion module, the second path of the 120MHz signal is used as a reference signal and is sent to the carrier generating circuit to generate a carrier signal, and the carrier signal is divided into six paths by the carrier power dividing circuit and then enters a modulation link, and each path of carrier signal is amplified, attenuated, subjected to switch modulation, subjected to power adjustment and subjected to time delay, and then transmitted to a transmitting and receiving front end as an echo output signal.
Further, the signal processing unit includes: the signal processing board collects signals, measures carrier frequency, counts repetition frequency and generates a time sequence reference signal, outputs a corresponding measurement result to the display control unit, and transmits the time sequence reference signal to the frequency synthesis module.
Compared with the prior art, the invention has the following advantages:
1. the invention has small volume, light weight and easy operation after adopting modular high integration, and is convenient for positioning and replacing module level faults; is easier to maintain than the prior art.
2. The receiving and transmitting front end of the device adopts a 30dB attenuator, a circulator and a power divider to process the incident signal of the airborne weather radar, and the processed signal adopts a USB power probe to measure the power, so that the peak power measurement precision is higher than that of the original RD-301A comprehensive test device.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a transceiver front end in accordance with the present invention;
FIG. 3 is a schematic diagram of a frequency conversion module according to the present invention;
FIG. 4 is a schematic diagram of a frequency synthesizer module according to the present invention;
FIG. 5 is a schematic diagram of a signal processing unit according to the present invention;
FIG. 6 is a schematic diagram of a display control unit according to the present invention;
FIG. 7 is a schematic diagram of a power module of the present invention;
fig. 8 is a schematic diagram of a chassis panel according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the meteorological radar comprehensive test equipment of the invention comprises a transceiving front end 1, a frequency conversion module 2, a frequency synthesis module 3, a signal processing unit 4, a display control unit 5, a power supply module 6 and a case panel 7. The transceiving front end 1 has two input ends I 11 、I 12 And five output terminals O 11 、O 12 、O 13 、O 14 、O 15 (ii) a The frequency conversion module 2 has four input ends I 21 、I 22 、 I 23 、I 24 And two output terminals O 21 、O 22 (ii) a The frequency synthesizer module 3 has three input terminals I 31 、I 32 、I 33 And two output terminals O 31 、 O 32 (ii) a The signal processing unit 4 has three input terminals I 41 、I 42 、I 43 And two output terminals O 41 、O 42 (ii) a The display control unit 5 has four input terminals I 51 、I 52 、I 53 、I 54 And three output terminals O 51 、O 52 、O 53 (ii) a The power supply module 6 has an input terminal and three output terminals O 61 、O 62 、O 63 (ii) a The chassis panel 7 has a front panel and a rear panel, the front panel 71 has four interfaces, i.e., a USB mouse interface, a USB keyboard interface, an N-type radio frequency interface, a BNC interface, and a power key, and the rear panel 72 has four interfaces, i.e., a multifunctional mouse interface, a multifunctional keyboard interface, a 220V ac power port, and a signal calibration port.
The radio frequency signal of the meteorological radar passes through the receiving and transmitting front end 1Is divided into four ports O after treatment 11 、O 12 、O 14 、O 15 An output, wherein the first output terminal O 11 The output radio frequency signal is transmitted to the frequency conversion module 2; second output terminal O 12 The outcoupled output signal is transmitted to a signal calibration port of the back panel 72 and connected to an external spectrometer for signal calibration; fourth output terminal O 14 The output power measurement signal is transmitted to the display control unit 5 for reading the power measurement value; a fifth output terminal O 15 The output pulse envelope detection signal is transmitted to the front panel 71 and connected to an external oscilloscope for measuring the pulse width. The frequency conversion module 2 is according to the locked first output end O 11 The frequency of the output radio frequency signal generates a local oscillation signal of 9260 MHz-9480 MHz, the local oscillation signal is divided into two paths, one path is coupled and output, and the local oscillation signal is connected with a signal calibration port of the rear panel 72; another local oscillator signal and the first output end O 11 The output radio frequency signal is subjected to frequency mixing and down conversion to obtain a 30MHz intermediate frequency signal, the intermediate frequency signal is subjected to orthogonal decomposition, filtering and Fourier transform processing by an information processing unit 4 to obtain frequency, repetition frequency information and a time sequence reference signal, the frequency and repetition frequency information reads frequency and repetition frequency values through a display control unit 5, and the time sequence reference signal is transmitted to a frequency synthesis module 3; the frequency synthesizer module 3 is controlled by the display control unit 5 to generate a radio frequency echo signal and a 120MHz clock signal, the radio frequency echo signal is transmitted to the weather radar through the transceiving front end 1, and the 120MHz clock signal is transmitted to the frequency conversion module 2 as a reference clock signal.
The display control unit 5 is in two-way communication with the signal processing unit 4 and the frequency synthesizer module 3 respectively.
When radar technical index measurement is carried out, radar incident signals enter a transceiving front end 1 of meteorological radar comprehensive test equipment through a radio frequency cable after passing through a 20dB coupling load, the radar incident signals pass through a 30dB attenuator 11, a circulator 12 and a power divider 13 and are divided into four paths of radio frequency signals, the first path of radio frequency signals are output after passing through a pulse envelope detector 14, the second path of radio frequency signals are directly coupled and output for calibration, the third path of radio frequency signals obtain peak power through a USB power probe 17, the fourth path of radio frequency signals are transmitted to a frequency conversion module 2 after being attenuated by a 12dB attenuator 15, the frequency conversion module 2 down-converts the radio frequency signals into intermediate frequency signals of 30MHz and transmits the intermediate frequency signals to a signal processing unit 4, the information processing unit 4 processes the intermediate frequency signals to obtain frequency, repetition frequency and time sequence reference signals of the radar incident signals, and the frequency, the time sequence reference signals of the incident signals, The repetition frequency information directly reads a numerical value through the display control unit 5, the time sequence reference signal is transmitted to the frequency synthesis module 3, the frequency synthesis module has six target analog echo output functions, parameters such as echo delay, echo frequency, echo pulse width and echo intensity can be respectively set in an individual target mode, the echo delay and the echo pulse width can be respectively adjusted in other target modes, such as 2 targets, 3 targets, 4 targets, 5 targets and 6 targets, and the echo frequency and the echo intensity can be adjusted but are uniform values; the display control unit 5 is responsible for finishing the functions of displaying the measurement information and generating the control signal, and the power supply module is responsible for generating power supplies required by the work of each unit module.
Referring to fig. 2, the transceiver front-end 1 includes a 30dB attenuator 11, a circulator 12, a power divider 13, a pulse envelope detector 14, a 12dB attenuator 15, a combined isolator 16, and a USB power probe 17. Incident signals of 50dBm-71.7dBm radar are attenuated by a 30dB attenuator 11 to leave 20dBm, then are subjected to insertion loss of 1dB and leave 19dBm by a circulator 12, and are subjected to power division and insertion loss of 1dB and power division loss of 6dB by a power divider 13 to be divided into four paths of 12dBm radio frequency signals, wherein the first path of radio frequency signal is subjected to a pulse envelope detector 14 to obtain a pulse envelope detection signal, and the detection signal passes through a fifth output port O 15 To the front panel 71; the second path of radio frequency signal is attenuated into a radio frequency signal of 0dBm by a 12dB attenuator 15, and the radio frequency signal is transmitted from a first output port O 11 To a first input I of a frequency conversion module 2 21 (ii) a The third path of radio frequency signal is coupled and attenuated and then is output from the second output port O 12 A signal calibration port to the rear panel 72 to facilitate signal calibration; the fourth path of radio frequency signal is measured by a USB power probe 17 to obtain radio frequency signal power information, and the power information is output from a fourth output port O 14 Transmitting to the display control unit 5 to read the power value of the radio frequency signal; from a first input port I 11 An input radio frequency echo signal is receivedThe output is transmitted to the circulator 12 without loss after passing through the combined isolator 16, and then transmitted to the third output port O after passing through the 30dB attenuator 11 13 。
Referring to fig. 3, the frequency conversion module 2 includes: control interface processing function circuit 21, power supply processing function circuit 22, PLL phase-locked loop circuit 23, and down-conversion channel 24. The power supply processing function circuit 22 filters and isolates the input +12V and-12V power supply signals, adjusts the power supply signals to +5V, +3.3V, +1.2V by adopting an LDO linear voltage regulator, and supplies power to internal active devices; the control interface processing function circuit 21 analyzes and converts an RS422 interface software command input by the display control unit 5 into an actual operation instruction, and controls each circuit to work according to the command, the operation instruction is input to a PLL phase-locked loop circuit 23 having a frequency locking indication function, the PLL phase-locked loop circuit 23 completes locking of an input radio frequency transmitted to the frequency conversion module 2 by the transceiving front end 1 in combination with a 30MHz intermediate frequency output, and generates a local oscillation signal of 9260MHz to 9480MHz by using 120MHz reference and 60MHz phase discrimination according to the locked input radio frequency, the local oscillation signal is divided into two paths, one path enters the down-conversion channel 24 to be mixed with the input radio frequency to obtain two paths of 30MHz intermediate frequency down-conversion signals, one path of the intermediate frequency signal is transmitted to the signal processing unit 4, and the other path is connected with the chassis panel 7 as a local oscillation coupling output.
Referring to fig. 4, the frequency synthesizer module 3 includes: a control interface processing circuit 31, a power supply processing circuit 32, a clock signal generating circuit 33, a carrier generating circuit 34, a carrier power dividing circuit 35, and a modulation link 36. The control interface processing circuit 31 comprises a differential level conversion circuit 311 and an FPGA circuit 312, the FPGA circuit 312 is used for carrier frequency control, echo signal delay and echo signal power control, the differential level conversion circuit 311 supplies power to the FPGA circuit 312, the FPGA circuit 312 analyzes 422 interface software commands input by the display control unit 5, converts the control commands into actual operation commands, and then delays echo signals input to the modulation link 36 by adopting a timing reference signal; the power supply processing circuit 32 adjusts the input +12V, -12V and-5V power supply signals to +5V, +3.3V, +1.2V and-5V, and supplies power to each circuit; the clock signal generating circuit 33 adopts a constant temperature crystal oscillator, an amplifier with gain of 10dB and an LC filter to generate 120MHz clock signal with power of 0dBm, the clock signal enters the power divider to be divided into two paths, the first path of 120MHz signal is amplified and filtered and then output to the frequency conversion module 2, the second path of 120MHz signal is used as a reference signal and sent to the carrier generating circuit 34, the carrier generating circuit generates 9250 MHz-9500 MHz carrier signal by referring to the 120MHz reference signal in a phase-locked loop mode, the carrier signal is amplified by the power amplifier circuit and then transmitted to the carrier power dividing circuit 35 to be divided into six carrier signals, the six carrier signals are filtered and then enter the modulation link 36, the modulation link delays the six carrier signals according to the control signal of the display control unit 5 and in combination with the time sequence reference signal input by the information processing unit 4, and the six carrier signals are amplified, attenuated, After the switch modulation and the power adjustment, the signals are used as echo output signals through the SMA coaxial connector and are transmitted to the meteorological radar through the combined isolator 16 of the transmitting-receiving front end 1.
Referring to fig. 5, the signal processing unit 4 includes: a signal processing board 41 and an interface board 42. The interface board 42 completes the communication function with the frequency conversion module 2 and the display control unit 5 through two paths of high-isolation RS422 communication interfaces; the signal processing board 41 collects the 30MHz intermediate frequency signal input by the frequency conversion module, measures the carrier frequency, counts the repetition frequency, and generates a timing reference signal, the frequency measurement and the repetition frequency count result is transmitted to the display control unit 5 through the RS422 communication interface of the interface board 42, so as to facilitate reading of the measurement value, and the timing reference signal is transmitted to the frequency synthesis module 3 for delaying the echo signal.
Referring to fig. 6 and 8, the display control unit 5 includes: a microcomputer 51 and a display screen 52. The microcomputer 51 is provided with three USB interfaces, namely a first interface USB1, a second interface USB2 and a third interface USB3, and is also provided with a SATA1 interface, an LVDS1 interface, an LCDB1 interface and two multifunctional interfaces; the front panel 71 is provided with a power key and four interfaces, namely a USB mouse interface, a USB keyboard interface, an N-type radio frequency interface and a BNC interface; the rear panel 72 is provided with four interfaces, namely a multifunctional mouse interface, a multifunctional keyboard interface, a 220V alternating current power supply port and a signal calibration port;the first channel interface USB1 and the second channel interface USB2 of the microcomputer 51 are connected with a mouse and a keyboard through a USB mouse interface and a USB keyboard interface of the front panel 71, respectively, so as to send control mode, echo delay, frequency and intensity instructions to the microcomputer 51, the third channel interface USB3 is connected with the USB power probe 17 so as to receive a peak power measurement value transmitted by the transceiver front end 1, the measurement value directly displays the measurement value through the display screen 52, the SATA1 interface is connected with the SSD hard disk for storing information, the LVDS1 interface and the LCDB1 interface are both connected with the display screen 51, and the two channels of multifunctional interfaces of the microcomputer 51 are connected with the multifunctional mouse interface and the multifunctional keyboard interface of the rear panel 72, respectively; the N-type RF interface of the front panel 71 is connected to the transceiving front end 1, the weather radar is connected to the transceiving front end 1 through the N-type RF interface, the BNC interface of the front panel 71 is connected to the fifth output port O of the transceiving front end 1 15 Connection for signal pulse width measurement; the 220V AC power port of the back panel 72 is connected with the power key of the front panel 71 for power-on control; the signal calibration port of the rear panel 72 and the second output port O of the transceiver front end 1 12 And a second output O of the frequency conversion module 2 22 And the connection is used for calibrating the output signal.
Microcomputer 51 is equipped with WIN7 operating system and LABVIEW software, in order to provide operating system, and provide the hardware environment for software development and software operation, this microcomputer 51 is connected with signal processing unit 4 and frequency synthesizer module 3 separately, and realize the two-way communication with signal processing unit 4 and frequency synthesizer module 3 separately through RS422 communication interface; the display screen 52 displays frequency, peak power, repetition frequency, sensitivity specific numerical information through a virtual instrument interface programmed with the LABVIEW software.
Referring to fig. 7, the power module 6 includes: the two power supply sub-modules 61 output two direct current voltages of +12V and-12V after transforming and rectifying 220V alternating current voltage input by a power supply key in the front panel 71 by the two power supply sub-modules 61 and the one power supply sub-module 62 so as to supply power to the frequency conversion module 2 and the frequency synthesizer module 3; one power supply submodule 62 transforms and rectifies the 220V ac voltage input through the power key in the front panel 71 to output +5V dc voltage, which is used to respectively supply power to the frequency synthesizer module 2, the information processing unit 4 and the display control unit 5.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A meteorological radar comprehensive test device is characterized by comprising a transceiving front end (1), a frequency conversion module (2), a frequency synthesis module (3), a signal processing unit (4), a display control unit (5), a power supply module (6) and a case panel (7);
the first output end O of the transceiving front end (1) 11 And a first input end I of the frequency conversion module (2) 21 Connection of second output terminal O 12 Connected with the case panel (7) and a third output end O thereof 13 Connected with the case panel (7) and a fourth output end O thereof 14 And a second input I of the display control unit (5) 52 Connection of fifth output terminal O 15 Connected with the case panel (7) and having a first input end I 11 A first output end O of the frequency and frequency synthesis module (3) 31 Connection of a second input terminal I thereof 12 Connected with the case panel (7), the third output end O 13 And the second input terminal I 12 Are the same end; the receiving and transmitting front end (1) comprises a 30dB attenuator (11), a circulator (12), a power divider (13), a pulse envelope detector (14), a 12dB attenuator (15), a combined isolator (16) and a USB power probe (17), and radar incident signals with the intensity of 50dBm-71.7dBm pass through the 30dB attenuator (11) for attenuation and the high-precision circulator (12) for insertion loss in sequence, are divided into four paths through the power divider (13), and are output to the pulse envelope detector (14), the 12dB attenuator (15), the USB power probe (17) and a rear panel (72) respectively; the signal detected by the pulse envelope detector (14) is output to a front panel (71), the signal attenuated by a 12dB attenuator (15) is input to a frequency conversion module (2), and power is carried out by a USB power probe (17)The measured signal is input to a second input terminal I of the display control unit (5) 52 ；
The second input end I of the frequency conversion module (2) 22 A second output end O of the frequency synthesizing module (3) 32 Connection of the third input terminal I 23 Connected with a power supply module (6) and a fourth input end I thereof 24 And a third output O of the display control unit (5) 53 Connection of first output terminal O 21 And a first input terminal I of a signal processing unit (4) 41 Is connected to the second output terminal O 22 As local oscillator coupling output, and is connected with the case panel (7);
the frequency synthesizer module (3) has a first input end I 31 And a first output terminal O of the display control unit (5) 51 Connection of second input terminal I 32 And a second output O of the signal processing unit (4) 42 Connection of the third input terminal I 33 Is connected with a power supply module (6);
the second input terminal I of the signal processing unit (4) 42 And a second output terminal O of the display control unit (5) 52 Connection of the third input terminal I 43 Connected with the power supply module (6) and has a first output end O 41 And a first input terminal I of a display control unit (5) 51 Connecting;
the power supply module (6) is respectively connected with the frequency conversion module (2), the frequency synthesis module (3), the signal processing unit (4) and the display control unit (5);
the chassis panel (7) comprises a front panel (71) and a rear panel (72), wherein the front panel (71) is respectively connected with the transceiving front end (1) and the display control unit (5), and the rear panel (72) is respectively connected with the frequency conversion module (2), the signal processing unit (4) and the display control unit (5);
the fifth output terminal O 15 Connected with BNC interface of case panel (7), connected with oscilloscope for measuring signal pulse width, and second output end O 12 The signal calibration port of the case panel (7) is connected for calibrating the output signal; the meteorological radar is connected with the transmitting-receiving front end (1) through an N-type radio frequency interface of the case panel (7); radar incident signal enters through N-type radio frequency interface of case panel (7)A second input port of the transceiving front end (1) is transmitted to the transceiving front end (1), and the radio-frequency echo signal enters an N-type radio-frequency interface of the chassis panel through a third output port of the transceiving front end (1) and is transmitted to the weather radar.
2. The apparatus according to claim 1, characterized in that the frequency conversion module (2) comprises: a control interface processing function circuit (21), a power supply processing function circuit (22), a PLL phase-locked loop circuit (23) and a down-conversion channel (24); the power supply processing function circuit (22) adjusts the input power supply signal to +5V, +3.3V and +1.2V, and supplies power for the internal active device, the control interface processing function circuit (21) controls the PLL circuit (23) to generate local oscillation signals, the local oscillation signals are divided into two paths, one path enters a down-conversion channel (24) to be mixed with the radio frequency input signals transmitted to the frequency conversion module (2) by the receiving and transmitting front end (1), the mixed intermediate frequency signals are transmitted to the signal processing unit (4), and the other path is used as local oscillation coupling output to be connected with the chassis panel (7).
3. The device of claim 2, wherein the control interface processing function circuit (21) controls the PLL circuit (23) to generate the local oscillator signal, and the control interface processing function circuit (21) analyzes and converts the input RS422 interface software command into an actual operation command, and inputs the actual operation command to the PLL circuit (23), and the PLL circuit generates a 9260MHz to 9480MHz local oscillator signal by using a 120MHz clock reference and a 60MHz phase demodulation.
4. The apparatus according to claim 1, characterized in that the frequency synthesizer module (3) comprises: the device comprises a control interface processing circuit (31), a power supply processing circuit (32), a clock signal generating circuit (33), a carrier generating circuit (34), a carrier power dividing circuit (35) and a modulation link (36); the control interface processing circuit (31) comprises a differential level conversion circuit (311) and an FPGA circuit (312) and is used for analyzing a 422 interface software command and converting the control command into an actual operation command, the operation command directly controls carrier power and carrier frequency, the operation command controls echo signal delay by combining with a time sequence reference signal output by the signal processing unit (4), the power supply processing circuit (32) adjusts an input power supply signal to +5V, +3.3V, +1.2V and-5V and supplies power to each circuit, the clock signal generating circuit (33) generates a 120MHz clock signal and divides the clock signal into two paths, the first path of 120MHz signal is amplified and filtered and then output to the frequency conversion module (2), the second path of 120MHz signal is used as a reference signal and is sent to the carrier generating circuit (34) to generate a carrier signal, the carrier signal is divided into 6 paths by the carrier power dividing circuit (35) and then enters the modulation link (36), each path of carrier signal is amplified, attenuated, switch modulated, power adjusted and delayed to be transmitted to a receiving and transmitting front end (1) as an echo output signal.
5. The device according to claim 2, characterized in that the signal processing unit (4) comprises: the signal processing board (41) and the interface board (42), the interface board (42) completes the communication function with the frequency conversion module (2) and the display control unit (5) through two paths of high-isolation RS422 communication interfaces, the signal processing board (41) collects signals, measures carrier frequency, counts repetition frequency, generates a time sequence reference signal, outputs a corresponding measurement result to the display control unit (5), and transmits the time sequence reference signal to the frequency synthesis module (3).
6. The apparatus according to claim 1, wherein the display control unit (5) comprises:
a microcomputer (51) for providing a hardware environment for software development and software operation, and providing an operating system;
the display screen (52) is realized by LABVIEW software and is used for displaying a human-computer interface;
the port of the microcomputer (51) is respectively connected with the panel (7) and the display screen (52).
7. The device according to claim 1, characterized in that the power supply module (6) comprises: the frequency conversion module comprises two power supply sub-modules (61) and one power supply sub-module (62), wherein the two power supply sub-modules (61) output + 12V-12V direct-current voltages which are used for supplying power to the frequency conversion module (2) and the frequency synthesizer module (3); one power supply submodule (62) outputs +5V direct-current voltage for respectively supplying power to the frequency synthesizer module (3), the signal processing unit (4) and the display control unit (5).
8. The apparatus according to claim 5, characterized in that the front panel (71) comprises: the USB mouse interface and the USB keyboard interface are connected with two interfaces of a microcomputer (51), namely a USB1 interface and a USB2 interface, the N-type radio frequency interface is connected with a 30dB attenuator (11), the BNC interface is connected with a pulse envelope detector (14), the power key is connected with a 220V alternating current power supply port of a rear panel (72), and the power key completes power-on control of equipment.
9. The apparatus of claim 5, wherein the back panel (72) comprises: the multifunctional mouse interface and the multifunctional keyboard interface are connected with a multifunctional port of a microcomputer (51), and the signal calibration port is connected with a PLL (phase locked loop) circuit (23) and a power divider (13).
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| CN109521408A (en) * | 2019-01-28 | 2019-03-26 | 中国气象局气象探测中心 | A kind of automatic testing equipment for weather radar |
| CN111862735A (en) * | 2020-07-29 | 2020-10-30 | 湖南科技大学 | Labview-based middle school physics experiment system and operation method thereof |
| CN112448735B (en) * | 2020-12-08 | 2024-02-06 | 陕西长岭电子科技有限责任公司 | X-band programmable integrated transceiver |
| CN114696923A (en) * | 2020-12-28 | 2022-07-01 | 北京振兴计量测试研究所 | Microwave attenuation measuring instrument |
| CN112859023B (en) * | 2021-03-10 | 2023-11-03 | 华云敏视达雷达(北京)有限公司 | Phased array weather radar's calibration system |
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