CN116256703A - Comprehensive tester for radio frequency receiving and transmitting characteristics of airborne weather radar - Google Patents
Comprehensive tester for radio frequency receiving and transmitting characteristics of airborne weather radar Download PDFInfo
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- CN116256703A CN116256703A CN202211104243.0A CN202211104243A CN116256703A CN 116256703 A CN116256703 A CN 116256703A CN 202211104243 A CN202211104243 A CN 202211104243A CN 116256703 A CN116256703 A CN 116256703A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention discloses an integrated tester for radio frequency transceiving characteristics of an airborne weather radar, which mainly solves the problem that the existing tester cannot measure the radio frequency transceiving characteristics of a solid-state airborne weather radar. The device comprises a core processing board, an intermediate frequency acquisition board, an X-band integrated transceiver module, a display control unit, a power probe, a numerical control attenuator and a power divider. One path of radar transmitting signals enters an X-band integrated transceiver module to obtain intermediate frequency signals after passing through a power divider, then the intermediate frequency signals are subjected to analog-to-digital conversion by an intermediate frequency acquisition board, the other path of radar transmitting signals enter a power probe, and finally the radar transmitting signals are subjected to data processing by a core processing board and then are sent to a display control unit; the display control unit sets radio frequency analog signal parameters, and sends the radio frequency analog signal parameters to the X-band integrated transceiver module and the numerical control attenuator after being processed by the core processing board, and generates a pulse modulation radio frequency analog signal to be transmitted to the radar to be detected. The invention has high accuracy, strong reliability and visual display of the test data, can store the test data in real time, and can be used for testing the radio frequency index of the airborne weather radar.
Description
Technical Field
The invention belongs to the technical field of electronic systems, in particular to a comprehensive tester for radio frequency receiving and transmitting characteristics, which can be used for testing radio frequency indexes of airborne weather radars.
Background
The comprehensive tester for the radio frequency receiving and transmitting characteristics of the airborne weather radar is used for testing radio frequency indexes of the weather radar, and can automatically acquire and track the transmitting frequency of the radar when testing the power and the frequency of the radar; when the sensitivity of the radar receiver is tested, the adjustable delay pulse internal modulation simulation target signal can be provided for the radar, and the tester accurately, quickly and intuitively provides radio frequency test data when the radar is designed, produced and maintained, so that a radar engineer can conveniently and timely master radio frequency indexes, and the problems in the design, debugging and maintenance process of the radar can be quickly identified.
At present, the test of the radio frequency index of the airborne weather radar mainly comprises a portable radar ground test instrument and an imported RD301A weather radar test instrument, wherein the portable radar ground test instrument and the imported RD301A weather radar test instrument are developed by a certain company in China, and the portable radar ground test instrument comprises:
the portable radar target simulator has the main functions of generating a radio frequency target simulation signal through the radio frequency set by the serial port RS232, sending the radio frequency target simulation signal to an external radar to be tested, and completing the radar receiving radio frequency index test. The simulator can only complete single-target simulation of a specific radar radio frequency signal, can not complete multi-target signal simulation, can generate target simulation with linear frequency modulation signals and measurement of radar emission radio frequency characteristics, is only suitable for weather radar products with a magnetron system, and can not be suitable for weather radar with a solid system with an intra-pulse modulation function.
RD301A weather radar tester, a tester specially used for weather radar developed and produced by AEROFLEX corporation in America, as shown in figure 1, it is made up of analog target generator, radio frequency signal source, intermediate frequency signal source, video threshold circuit, frequency display control switch, nixie tube frequency display, frequency detection circuit, attenuator input/output control circuit, radio frequency switch control, power indicating circuit and power detection circuit, the tester can produce single target and multi-target analog signal to finish radar receiving radio frequency characteristic measurement, finish receiving radar radio frequency signal to finish radar transmitting radio frequency characteristic measurement through the radio frequency input port, but it has the following disadvantages:
firstly, weather radar products only suitable for magnetron systems cannot be suitable for weather radars with solid systems with intra-pulse modulation functions;
secondly, the operation is complicated during the test, the test result is displayed by a dial plate and a nixie tube, and the data reading is not visual;
thirdly, the test result cannot be automatically stored, and the test data is required to be recorded manually;
and fourthly, the radio frequency signal source, the intermediate frequency signal source and the radio frequency switch in the composition are controlled to be independent devices, so that the reliability is reduced, and the tester is expensive to purchase.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an on-board weather radar radio frequency receiving and transmitting characteristic comprehensive tester which is suitable for weather radars with solid systems with pulse modulation functions, simplifies test operation, visually displays test results, avoids the need of manually recording test data and improves reliability.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an airborne weather radar radio frequency receiving and dispatching characteristic comprehensive tester which is characterized in that: the device comprises a core processing board 1, an intermediate frequency acquisition board 2, an X-band integrated transceiver module 3, a display control unit 4, a power probe 5, a numerical control attenuator 6 and a power divider 7;
the core processing board 1 is provided with 4 connection ports, and a first connection port J1 of the core processing board is in bidirectional connection with an input/output port of the X-band integrated transceiver module 3 and is used for finishing signal level conversion, data receiving and transmitting, data framing and decoding and generating a synchronous time sequence TR; the second connection port J2 is connected with the input/output port of the display control unit 4 in a bidirectional manner and is used for completing data communication and code conversion; the third connection port J3 is in bidirectional connection with an input/output port of the numerical control attenuator 6 and is used for completing data communication and attenuation value coding; the fourth connection port J4 is connected with the input/output port of the intermediate frequency acquisition board 2 in a bidirectional manner and is used for completing the transmission of intermediate frequency digital signals;
the intermediate frequency acquisition board 2 is used for completing the conversion of intermediate frequency analog signals into intermediate frequency digital signals;
the output port A of the X-band integrated transceiver module 3 is connected with the input port of the intermediate frequency acquisition board 2 in a unidirectional manner and is used for transmitting the generated intermediate frequency analog signals to the intermediate frequency acquisition board 2; the output port B of the digital control attenuator 6 is connected with the input port of the digital control attenuator 6 in a unidirectional way and is used for transmitting the generated radio frequency signals to the digital control attenuator 6;
the display control unit 4 is used for completing serial port communication, control instruction setting and test data display;
the output port of the power probe 5 is connected with the input port of the display control unit 4 in a one-way manner, and is used for completing the power measurement of the equipment to be tested and transmitting the measured power to the display control unit 4 for display;
the numerical control attenuator 6 is used for carrying out amplitude attenuation on the received radio frequency signals and transmitting the radio frequency signals to an external radar to be detected;
the power divider 7 is configured to receive an external input radio frequency signal and output the radio frequency signal from 2 output ports, where a first output port a of the power divider is connected with an input port of the X-band integrated transceiver module 3 in a unidirectional manner, and transmit the radio frequency signal to the X-band integrated transceiver module 3; the second output port B is connected with the input port of the power probe 5 in a unidirectional way, and transmits the radio frequency signal to the power probe 5.
Further, the core processing board 1 includes: an FPGA circuit 11, an RS422 interface circuit 12, and an information processing unit 13;
the FPGA circuit 11 is used for completing configuration of the FPGA and conversion of the logic circuit;
the RS422 interface circuit 12 is used for completing conversion of an RS422 serial port level format and is respectively connected with four connection ports J1, J2, J3 and J4 through a printed board transmission line;
the information processing unit 13 is used for completing RS422 serial signal analysis and framing, and performing FFT signal processing on the received intermediate frequency signal.
Further, the intermediate frequency acquisition board 2 uses an AD9226 digital-to-analog conversion chip to complete conversion between the intermediate frequency analog signal and the intermediate frequency digital signal.
Further, the X-band integrated transceiver module 3 includes a receiving unit 31, a frequency synthesizing unit 32, and a transmitting unit 33;
the receiving unit 31 converts the received radio frequency signal with the frequency of 9300 MHz-9400 MHz into an intermediate frequency signal with the frequency of 30MHz and outputs the intermediate frequency signal to the intermediate frequency acquisition board 2;
the frequency synthesis unit 32 generates an intra-pulse modulation signal by a digital frequency synthesizer;
the input end of the transmitting unit 33 is connected with the output end of the frequency synthesizing unit 32 in one way, and the pulse-width modulated signal is up-converted to generate a radio frequency signal of 9300 MHz-9400 MHz and output to the digital controlled attenuator 6.
Further, the display control unit 4 includes: an echo parameter setting module 41, an emission characteristic measuring module 42, and a data recording module 43;
the echo parameter setting module 41 is used for setting parameters required by the analog echo;
the emission characteristic measurement module 42 is configured to display radio frequency characteristic parameters of the measurement radar;
the data recording module 43 is used for automatically recording all test data in the measuring process.
Further, the power probe 5 adopts NRP-Z series to complete power measurement of radio frequency signals with the amplitude range of-60 to +20dBm and the frequency range of DC to 18 GHz.
Further, the digital control attenuator 6 attenuates the radio frequency signal from the X-band integrated transceiver module 3 by 0 to 120dBm, and outputs the attenuated signal to an external radar to be detected.
Further, the information processing unit 13 includes a programmable logic module 131 and a system processing module 132, which are connected in both directions;
the programmable logic module 131 is configured to complete FFT operation and pulse time detection on the intermediate frequency signal received by the intermediate frequency acquisition card 2, and transmit a processing result to the system processing module 132;
the system processing module 132 performs frequency resolution and frequency-locked spectrum analysis on the operation result from the programmable logic module 131, and frames the analysis result and transmits the result to the display control unit 4.
Further, the programmable logic module 131 includes a timing sub-module 131a, a signal processing sub-module 131b, a pulse time detection sub-module 131c, and a CPU interface sub-module 131d;
the time sequence submodule 131a is respectively connected with the signal processing submodule 131b and the CPU interface submodule 131d in a unidirectional way and is used for generating a required internal working time sequence;
the signal processing submodule 131b is used for storing the digital signal transmitted by the intermediate frequency acquisition board 2 and carrying out FFT operation on the digital signal;
the pulse time detection submodule 131c is used for detecting different pulse durations in one pulse group period;
the CPU interface submodule 131d is connected with the signal processing submodule 131b and the pulse time detection submodule 131c in a unidirectional manner, and is used for transmitting processing results of the signal processing submodule 131b and the pulse time detection submodule 131c to the system processing module 132.
Further, the system processing module 132 includes: a frequency solver module 132a, a frequency lock/scan process sub-module 132b, a serial communication sub-module 132c, and a serial instruction process sub-module 132d;
the frequency solver module 132a is configured to perform spectrum analysis on the FFT operation result transmitted from the programmable logic module 131, and calculate the center frequency of the signal spectrum, and the signal spectrum parameters with the maximum amplitude;
the frequency locking/scanning processing sub-module 132b is configured to complete frequency measurement of the pulse signal and lock a current frequency value;
the serial port instruction processing submodule 132d is used for completing analysis, judgment, processing and frame reorganization of serial port information;
the serial port communication sub-module 132c is bi-directionally connected with the serial port instruction processing sub-module 132d, and is configured to send the received external RS422 serial port data to the serial port instruction processing sub-module 132d, and send the RS422 serial port data from the serial port instruction processing sub-module 132d after being re-framed.
Compared with the prior art, the invention has the following advantages:
1. the invention has the advantages that as the core processing board structure and the connection relation are arranged, the operation speed and the precision during data processing are improved, and the accuracy of instrument measurement is improved;
2. the X-band integrated transceiver module integrates the transmitting unit, the receiving unit and the frequency synthesis unit, so that the reliability of the tester is enhanced;
3. the invention has the advantages of avoiding the inconvenience of manually recording the test data, along with simple operation, visual display of the test data, real-time storage of the test data and friendly man-machine interaction interface due to the arrangement of the display control unit.
Drawings
FIG. 1 is a block diagram of a conventional RD301A weather radar tester;
FIG. 2 is a block diagram of the structural principles of the present invention;
FIG. 3 is a block diagram of a core processing board structure in accordance with the present invention;
fig. 4 is a block diagram of an X-band integrated transceiver module according to the present invention;
FIG. 5 is a block diagram showing the structure of a display control unit according to the present invention;
fig. 6 is a logic block diagram of an information processing unit in the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 2, the present example includes a core processing board 1, an intermediate frequency acquisition board 2, an X-band integrated transceiver module 3, a display control unit 4, a power probe 5, a digitally controlled attenuator 6, and a power divider 7.
The core processing board 1 is provided with 4 connection ports, and a first connection port J1 of the core processing board is in bidirectional connection with an input/output port of the X-band integrated transceiver module 3 and is used for finishing signal level conversion, data receiving and transmitting, data framing and decoding and generating a synchronous time sequence TR; the second connection port J2 is connected with the input/output port of the display control unit 4 in a bidirectional manner and is used for completing data communication and code conversion; the third connection port J3 is in bidirectional connection with an input/output port of the numerical control attenuator 6 and is used for completing data communication and attenuation value coding; the fourth connection port J4 is connected with the input/output port of the intermediate frequency acquisition board 2 in a bidirectional manner and is used for completing the transmission of intermediate frequency digital signals. When the core processing board 1 receives data, the X-band integrated transceiver module 3 regularly transmits fault information, including a repetition frequency PRF fault, an external trigger TR fault, a control command fault and a transmitting channel fault, of the components to the core processing board 1 to judge whether the X-band integrated transceiver module 3 works normally or not; the display control unit 4 sends the control information of the pulse frequency point, the echo intensity, the delay time, the internal trigger or the external trigger selection to the core processing board 1; the intermediate frequency acquisition board 2 sends an intermediate frequency digital signal of 30MHz to the core processing board 1; when the core processing board 1 transmits data, control information corresponding to the current state is respectively issued to each module connected thereto by analyzing the RS422 control information from the display control unit 4.
The intermediate frequency acquisition board 2 adopts an AD9226 analog-to-digital conversion chip and is used for converting an intermediate frequency analog signal of 30MHz into an intermediate frequency digital signal of 30 MHz.
The X-band integrated transceiver module 3 is provided with two output ports, wherein the first output port A is connected with the input port of the intermediate frequency acquisition board 2 in a one-way, receives and down-converts radio frequency signals with the frequency range of 9300 MHz-9400 MHz from a radar to be detected into 30MHz intermediate frequency analog signals, and transmits the 30MHz intermediate frequency analog signals to the intermediate frequency acquisition board 2; the second output port B is connected with the input port of the numerical control attenuator 6 in a one-way and is used for transmitting the pulse signal which is generated by the pulse modulation and has the frequency range of 9300 MHz-9400 MHz and the output power of not less than-50 dBm to the numerical control attenuator 6.
The display control unit 4 has two functions, namely, the setting of parameters such as pulse frequency points, echo intensity and delay time is completed and the parameters are sent through an RS422 serial port; secondly, different pulse width pulse characteristics are finished, such as: the measured data of pulse power, pulse width, carrier frequency, pulse period and pulse group period are received and displayed.
The power probe 5 adopts NRP-Z series, the input port of the NRP-Z series is connected with the power divider 7 in a unidirectional way, the output port of the NRP-Z series is connected with the input port of the display control unit 4 in a unidirectional way, the power measurement of radio frequency signals with the amplitude range of-60 to +20dBm and the frequency range of DC-18 GHz is completed, and the measured power is transmitted to the display control unit 4 for display.
The numerical control attenuator 6 is used for carrying out amplitude attenuation of 0-120 dBm on the 9300 MHz-9400 MHz radio frequency signals from the X-band integrated transceiver module 3, and transmitting the attenuated radio frequency signals to an external radar to be detected.
The power divider 7 is configured to receive an input radio frequency signal of an external radar to be detected, divide the radio frequency signal into two paths, and output the two paths of radio frequency signals from two output ports, where a first output port a is connected with an input port of the X-band integrated transceiver module 3 in one way through an SMA radio frequency cable, and transmit the radio frequency signal of 9300MHz to 9400MHz to the X-band integrated transceiver module 3; the second output port B is connected with the input port of the power probe 5 in a one-way, and transmits the 9300 MHz-9400 MHz radio frequency signals to the power probe 5.
Referring to fig. 3, the core process board 1 includes: an FPGA circuit 11, an RS422 interface circuit 12, and an information processing unit 13.
The FPGA circuit 11 is connected with the RS422 interface circuit 12 in a bidirectional manner through a printed board transmission line; the information processing unit 13 is mapped to the FPGA circuit 11 through a logic block, and is used for completing configuration such as powering up the FPGA, clearing configuration memory, checking device ID and loading data, performing logic conversion on RS422 serial port data from the RS422 interface circuit 12, and sending the converted logic information to the information processing unit 13;
the RS422 interface circuit 12 is connected with a forty-core rectangular connector, a fifty-one-core rectangular connector, a nine-core rectangular connector and a fifteen-core rectangular connector in a bidirectional manner through a printed board transmission line, and is respectively connected with an intermediate frequency acquisition board 2, an X-band integrated transceiver module 3, a display control unit 4 and a digital control attenuator 6 in a bidirectional manner, so as to complete conversion of an RS422 serial port level format;
the information processing unit 13 performs frame header, checksum analysis on 15 bytes of RS422 serial port data with the frame header of 0X7F7F from the display control unit 4, and then reorganizes 13 bytes of control commands with the frame header of 0XB0B0 to complete the work control of the X-band integrated transceiver module 3; the working control of the digital attenuator 6 is completed under a 28-byte control command with the frame header of 0X9F 9F; the frequency resolving and frequency locking signal processing is completed on the intermediate frequency digital signal from the intermediate frequency acquisition board 2 by utilizing FFT.
Referring to fig. 4, the X-band integrated transceiver module 3 includes: a receiving unit 31, a frequency synthesizing unit 32, and a transmitting unit 33; the input of the transmitting unit 33 is connected unidirectionally to the output of the frequency synthesizing unit 32.
The receiving unit 31 converts the received radio frequency signal with the frequency of 9300 MHz-9400 MHz into an intermediate frequency signal with the frequency of 30MHz after two down-conversion treatments, amplifies the intermediate frequency signal and outputs the intermediate frequency signal to the intermediate frequency acquisition board 2;
the frequency synthesizing unit 32 generates an intra-pulse modulation signal by the digital frequency synthesizer through the received control command and transmits it to the transmitting unit 33;
the transmitting unit 33 up-converts the received pulse modulated signal to generate a radio frequency signal of 9300MHz to 9400MHz, and outputs the radio frequency signal to the digital controlled attenuator 6.
Referring to fig. 5, the display control unit 4 includes: an echo parameter setting module 41, an emission characteristic measuring module 42 and a data recording module 43, wherein:
the echo parameter setting module 41 is configured to complete the setting of parameters such as pulse frequency point, pulse selection, echo intensity, delay time, LFM selected automatically or manually, or no modulation selection;
the emission characteristic measurement module 42 is configured to perform real-time display of data such as pulse power, pulse width, rising edge, falling edge, carrier frequency, pulse period, and pulse group period;
the data recording module 43 is used for completing the recording work of all data measured in the using process of the instrument and storing the data in a txt format, so that a tester can conveniently analyze the test data at a later time.
Referring to fig. 6, the information processing unit 13 includes: a programmable logic module 131 and a system processing module 132. Wherein:
the programmable logic module 131 is configured to receive an external 30MHz intermediate frequency signal, perform 8192-point FFT operation on the intermediate frequency signal, perform modulo calculation, max position calculation, and the like on the FFT operation result, and send the final result to the system processing module 132 through the DMA data bus, and includes a timing sub-module 131a, a signal processing sub-module 131b, a pulse time detecting sub-module 131c, and a CPU interface sub-module 131d.
The timing sub-module 131a is connected with the signal processing sub-module 131b and the CPU interface sub-module 131d through 2bit I/O data lines, and generates an internal PRF timing signal to provide the signal processing sub-module 131b and a pulse counting timing signal to provide to the CPU interface sub-module 131d based on the rising edge of the TR timing signal after receiving the external TR timing signal;
the signal processing sub-module 131b is connected with the CPU interface sub-module 131d in a unidirectional manner, and is configured to perform digital down-conversion processing on the received 30MHz intermediate frequency acquisition signal, then perform FFT operation, record the maximum positive value in the intermediate frequency acquisition signal, and finally store the FFT operation result in the FIFO;
the pulse time detection submodule 131c is connected with the CPU interface submodule 131d in a one-way, and is used for finishing negative inversion of the intermediate frequency acquisition signal, carrying out threshold detection processing on the inverted signal, and finally obtaining the period and the pulse width of the pulse when the inverted signal is greater than a threshold value and smaller than a threshold value and is given 1 and 0;
the CPU interface sub-module 131d is configured to send pulse width data output by the signal processing sub-module 131b and output by the pulse time detection sub-module 131c of the FFT signal to the system processing module 132 through the DMA data bus.
The system processing module 132 is configured to perform frequency resolution and frequency-locked spectrum analysis on the data received from the programmable logic module 131 to obtain parameter information such as a frequency point, a pulse width, a period, etc. of the current pulse, and includes a frequency resolution sub-module 132a, a frequency locking/scanning processing sub-module 132b, a serial port instruction processing sub-module 132c, and a serial port communication sub-module 132d.
The frequency solution operator module 132a performs threshold discrimination on the FFT signal to obtain a maximum peak position, and then calculates the frequency and bandwidth of the maximum peak position;
the frequency lock/sweep processing sub-module 132b counts the maximum frequency of the maximum peak position, if the statistical count is 0, indicating that no signal is currently searched and re-searched; when the statistical count is not 0, searching the current signal and locking the frequency value of the signal;
the serial port instruction processing sub-module 132c analyzes the 14-byte feedback information received by the X-band integrated transceiver module 3, and determines the working mode, the frequency control word and the amplitude attenuation of the X-band integrated transceiver module 3, so as to verify whether the X-band integrated transceiver module 3 works normally; judging and framing the states of the instrument such as work or dormancy, a triggering mode, a self-checking mode, manual or automatic frequency setting and the like according to the received instruction of the display control unit 4;
the serial communication submodule 132d mainly completes the receiving and sending of the RS422 serial command, and receives 16 bytes of data from the display control unit 4, including information such as instrument state, frequency setting mode, analog callback strength, analog echo frequency, output pulse spectrum setting and frequency searching mode; receiving 14 bytes of feedback information from the X-band integrated transceiver module 3 including the information of the working mode, the frequency control word and the amplitude attenuation; transmitting 28 bytes of data including information such as instrument status, carrier frequency, frequency control word, pulse set period, pulse width to the display control unit 4; and transmitting 14 bytes of data comprising information such as echo delay, echo frequency point, amplitude gain and echo selection to the X-band integrated transceiver module 3.
The working principle of this example is as follows:
the test of the radio frequency receiving and transmitting characteristics of the airborne weather radar is mainly realized, namely the test of the radio frequency indexes transmitted by the airborne weather radar, such as the power, the pulse width, the pulse period and the rising edge of the transmitted pulse, and the test of the sensitivity of the receiving radio frequency indexes, such as a receiver, are completed, and the specific realization process is as follows:
when an airborne weather radar transmits radio frequency indexes, the tester divides a received radar transmission radio frequency pulse signal into two paths through a power divider, one path of the radar transmission radio frequency pulse signal passes through an X-band integrated transceiver module 3 and then is subjected to down-conversion processing to obtain an intermediate frequency signal, the obtained intermediate frequency signal is transmitted to an intermediate frequency acquisition board 2 through an SMA intermediate frequency cable, an analog signal is converted into an intermediate frequency digital signal and then is transmitted to a core processing board 1, and digital signal processing is completed to obtain information such as carrier frequency, pulse width, pulse group period and the like; the other path of radio frequency pulse signals enter the power probe 5 to obtain pulse power information; finally, the radio frequency pulse signal parameters are displayed through the display control unit 4, so that the radar emission radio frequency index test is completed.
When the airborne weather radar is tested by using the tester to receive radio frequency indexes, firstly, the display control unit 4 sets information such as pulse frequency points, pulse selection, echo delay and the like by the echo parameter setting module, serial port information containing echo parameters is sent to the core processing board 1, after analysis and framing of the serial port information are completed by the core processing board 1, the information is sent to the X-band integrated transceiver module 3, a radio frequency pulse echo analog signal with an intra-pulse modulation characteristic is generated by the X-band integrated transceiver module 3 and is sent to the numerical control attenuator 6, and the numerical control attenuator 6 carries out amplitude attenuation on the radio frequency pulse echo analog signal and then sends the radio frequency pulse echo analog signal to an external radar to be tested, so that the test of the radar to receive the radio frequency indexes is completed.
The foregoing description is only one specific example of the invention and is not intended to limit the invention in any way, and it will be apparent to those skilled in the art that various modifications and 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 (10)
1. An airborne weather radar radio frequency receiving and dispatching characteristic comprehensive tester which is characterized in that: the device comprises a core processing board (1), an intermediate frequency acquisition board (2), an X-band integrated transceiver module (3), a display control unit (4), a power probe (5), a numerical control attenuator (6) and a power divider (7);
the core processing board (1) is provided with 4 connection ports, and a first connection port J1 of the core processing board is in bidirectional connection with an input/output port of the X-band integrated transceiver module (3) and is used for finishing signal level conversion, data receiving and transmitting, data framing and decoding and generating a synchronous time sequence TR; the second connection port J2 is connected with the input/output port of the display control unit (4) in a two-way manner and is used for completing data communication and code conversion; the third connection port J3 is in bidirectional connection with an input/output port of the numerical control attenuator (6) and is used for completing data communication and attenuation value coding; the fourth connecting port J4 is connected with the input/output port of the intermediate frequency acquisition board (2) in a bidirectional manner and is used for completing the transmission of intermediate frequency digital signals;
the intermediate frequency acquisition board (2) is used for completing the conversion of intermediate frequency analog signals into intermediate frequency digital signals;
the output port A of the X-band integrated transceiver module (3) is connected with the input port of the intermediate frequency acquisition board (2) in a one-way and is used for transmitting the generated intermediate frequency analog signals to the intermediate frequency acquisition board (2); the output port B of the digital control attenuator is connected with the input port of the digital control attenuator (6) in a unidirectional way and is used for transmitting the generated radio frequency signals to the digital control attenuator (6);
the display control unit (4) is used for completing serial port communication, control instruction setting and test data display;
the output port of the power probe (5) is connected with the input port of the display control unit (4) in a one-way, and is used for completing the power measurement of the equipment to be tested and transmitting the measured power to the display control unit (4) for display;
the numerical control attenuator (6) is used for carrying out amplitude attenuation on the received radio frequency signals and transmitting the radio frequency signals to an external radar to be detected;
the power divider (7) is used for receiving an external input radio frequency signal and outputting the radio frequency signal from 2 output ports, and a first output port A of the power divider is connected with an input port of the X-band integrated transceiver module (3) in a unidirectional manner and transmits the radio frequency signal to the X-band integrated transceiver module (3); the second output port B is connected with the input port of the power probe (5) in a unidirectional way, and transmits radio frequency signals to the power probe (5).
2. Tester according to claim 1, characterized in that the core processing board (1) comprises: an FPGA circuit (11), an RS422 interface circuit (12) and an information processing unit (13);
the FPGA circuit (11) is used for completing the configuration of the FPGA and the conversion of the logic circuit;
the RS422 interface circuit (12) is used for completing conversion of an RS422 serial port level format and is respectively connected with four connecting ports J1, J2, J3 and J4 through a printed board transmission line;
the information processing unit (13) is used for completing RS422 serial port signal analysis and framing and performing FFT signal processing on the received intermediate frequency signals.
3. The tester according to claim 1, wherein the intermediate frequency acquisition board (2) uses an AD9226 digital-to-analog conversion chip to perform conversion between the intermediate frequency analog signal and the intermediate frequency digital signal.
4. The tester according to claim 1, wherein the X-band integrated transceiver module (3) comprises a receiving unit (31), a frequency synthesis unit (32) and a transmitting unit (33);
the receiving unit (31) converts the received radio frequency signals with the frequency of 9300 MHz-9400 MHz into intermediate frequency signals with the frequency of 30MHz and outputs the intermediate frequency signals to the intermediate frequency acquisition board (2);
the frequency synthesis unit (32) generates an intra-pulse modulation signal by a digital frequency synthesizer;
the input end of the transmitting unit (33) is connected with the output end of the frequency synthesizing unit (32) in one way, and the pulse-in modulation signal is up-converted to generate a radio frequency signal of 9300 MHz-9400 MHz and output to the numerical control attenuator (6).
5. Tester according to claim 1, characterized in that the display control unit (4) comprises: an echo parameter setting module (41), an emission characteristic measuring module (42), and a data recording module (43);
the echo parameter setting module (41) is used for setting parameters required by the simulation echo;
the emission characteristic measurement module (42) is used for displaying radio frequency characteristic parameters of the measurement radar;
the data recording module (43) is used for automatically recording all test data in the measuring process.
6. The tester according to claim 1, characterized in that the power probe (5) uses NRP-Z series to perform power measurement of radio frequency signals with amplitude ranging from-60 to +20dBm and frequency ranging from DC to 18 GHz.
7. The tester according to claim 1, wherein the digital control attenuator (6) attenuates the radio frequency signal from the X-band integrated transceiver module (3) by 0-120 dBm and outputs the attenuated signal to an external radar to be tested.
8. The tester according to claim 2, wherein the information processing unit (13) comprises a programmable logic module (131) and a system processing module (132) which are connected in both directions;
the programmable logic module (131) is used for completing FFT operation and pulse time detection on the intermediate frequency signal received by the intermediate frequency acquisition card (2) and transmitting a processing result to the system processing module (132);
the system processing module (132) completes frequency resolution and frequency locked spectrum analysis on the operation result from the programmable logic module (131), and frames the analysis result and sends the analysis result to the display control unit (4).
9. The tester according to claim 8, wherein the programmable logic module (131) includes a timing sub-module (131 a), a signal processing sub-module (131 b), a pulse time detection sub-module (131 c), and a CPU interface sub-module (131 d);
the time sequence sub-module (131 a) is respectively connected with the signal processing sub-module (131 b) and the CPU interface sub-module (131 d) in a unidirectional way and is used for generating a required internal working time sequence;
the signal processing sub-module (131 b) is used for storing the digital signal transmitted by the intermediate frequency acquisition board (2) and carrying out FFT operation on the digital signal;
the pulse time detection submodule (131 c) is used for detecting different pulse durations in a pulse group period;
the CPU interface sub-module (131 d) is connected with the signal processing sub-module (131 b) and the pulse time detection sub-module (131 c) in a unidirectional way respectively, and is used for transmitting the processing results of the signal processing sub-module (131 b) and the pulse time detection sub-module (131 c) to the system processing module (132).
10. The tester according to claim 8, wherein the system processing module (132) comprises: a frequency-resolving sub-module (132 a), a frequency-locking/scanning processing sub-module (132 b), a serial communication sub-module (132 c) and a serial instruction processing sub-module (132 d);
the frequency solution operator module (132 a) is used for completing spectrum analysis on the FFT operation result transmitted by the programmable logic module (131), calculating the center frequency of a signal spectrum and the signal spectrum parameters with the maximum amplitude;
the frequency locking/scanning processing sub-module (132 b) is used for completing frequency measurement of the pulse signal and locking the current frequency value;
the serial port instruction processing sub-module (132 d) is used for completing analysis, judgment, processing and framing of serial port information;
the serial port communication sub-module (132 c) is in bidirectional connection with the serial port instruction processing sub-module (132 d) and is used for sending received external RS422 serial port data to the serial port instruction processing sub-module (132 d) and sending RS422 serial port data from the serial port instruction processing sub-module (132 d) after being re-framed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211104243.0A CN116256703A (en) | 2022-09-09 | 2022-09-09 | Comprehensive tester for radio frequency receiving and transmitting characteristics of airborne weather radar |
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| CN202211104243.0A CN116256703A (en) | 2022-09-09 | 2022-09-09 | Comprehensive tester for radio frequency receiving and transmitting characteristics of airborne weather radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117294339A (en) * | 2023-08-08 | 2023-12-26 | 中国人民解放军61035部队 | Satellite portable station detection circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117294339A (en) * | 2023-08-08 | 2023-12-26 | 中国人民解放军61035部队 | Satellite portable station detection circuit and electronic equipment |
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