CN110890925A - Signal processing unit of portable communication and navigation tester - Google Patents
Signal processing unit of portable communication and navigation tester Download PDFInfo
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- CN110890925A CN110890925A CN201911348278.7A CN201911348278A CN110890925A CN 110890925 A CN110890925 A CN 110890925A CN 201911348278 A CN201911348278 A CN 201911348278A CN 110890925 A CN110890925 A CN 110890925A
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- 238000005259 measurement Methods 0.000 description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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Abstract
The invention discloses a signal processing unit of a portable communication and navigation tester, which comprises a core board, an intermediate frequency sampling module, a signal control FPGA, a digital down-conversion FPGA, an audio signal generating module, a signal voltage measuring module and a power supply conversion module. The core board adopts SOM-TL138 to receive and send various commands, then controls each function module of the instrument, controls various working states of the whole machine, simultaneously sends data measured from the modules to a microcomputer for display after calculation processing, realizes the collection of various measuring functions, can measure various signals, and can enable the portable communication and navigation tester containing the circuit to be used for communication and maintenance of airplanes, ships and the like.
Description
Technical Field
The present invention relates to electronic measurement instruments, and more particularly, to a signal processing unit of a portable communication and navigation tester.
Background
On an airplane or a ship, since space is limited, conventional communication signal testing and repairing equipment cannot be used, and portable equipment is generally used to reduce the size of detection equipment so as to be practical. However, on the premise of achieving the same technical index, the reduction of the size of the equipment means that various indexes of components for signal processing and acquisition need to be adjusted, and for the realized circuit, improvement needs to be carried out for portable application.
A portable communication and navigation tester is used for communication and maintenance of airplanes, ships and the like, can measure VHF/UHF transmitter frequency, output power, modulation degree (AM and FM) and receiver sensitivity, measure HF transmitter frequency, output power, modulation degree (AM and SSB) and receiver sensitivity to generate ARINC 596 selective calling signals, measure Standing Wave Ratio (SWR) of HF/VHF/UHF antennas and/or feeders, and can set DDM to simulate course and glide-slope signals at the same time, scan and position, and is used for automatic guidance test of coupling (simultaneously simulating course, glide-slope and pointing beacon signals). VOR beacons of different orientations can be simulated, pointing beacons, outer pointing points and middle pointing signals can be simulated, and the frequency, output power and modulation (AM) of a 121.5/243MHz emergency beacon transmitter can be measured. And an audio output for monitoring the scanning audio signal and measuring the frequency and output power of the 406MHz COSPAS/SARSAT emergency beacon transmitter. All locations and user protocols can be decoded and displayed.
How to process signals input by the radio frequency front end unit is a difficult point in designing portable communication and navigation testers.
Disclosure of Invention
The invention provides a signal processing unit of a portable communication and navigation tester aiming at the requirement of the portable communication and navigation tester for signal processing.
In order to achieve the above purpose, the invention provides the following technical scheme:
a signal processing unit of a portable communication and navigation tester comprises a core board, an intermediate frequency sampling module, a signal control FPGA, a digital down-conversion FPGA, an audio signal generating module, a signal voltage measuring module and a power supply conversion module;
the core board receives and sends various commands of the signal control FPGA through an uPP line, an SPI line and an EMIF line; the core board is connected with a network interface through a LAN (local area network) line; the core board is connected with the digital down-conversion FPGA through an IO line; the core board is connected with the switch control and serial port module through an RS232 line, so that communication conversion control of the system and external equipment is realized;
the signal control FPGA controls the audio signal generation module to generate a frequency signal through the SPI;
the audio generation module receives a command of controlling the FPGA by the signal through an SPI line and synthesizes audio output with specified frequency according to the command of controlling the FPGA by the signal;
the intermediate frequency sampling module samples the received external audio signal and transmits the external audio signal to the digital down-conversion FPGA;
the digital down-conversion FPGA digitizes the sampled signal; the digital down-conversion FPGA is connected with the signal voltage measuring module;
the DC voltage input from the outside enters the power conversion module, and the power conversion module generates working voltage and supplies power to each module.
Preferably, the core board comprises an SOM-TL138 core board part, and after the onboard IO port, the upp data bus, the EMIF data bus, the SPI serial port, the LAN port, and the RS232 port are used for communication control, receiving and sending various commands, the core board controls each function module of the instrument, controls various working states of the whole machine, and sends data measured in the slave module to the upper microcomputer for display after calculation processing.
Preferably, the audio signal generating module comprises a waveform generator. And programming and controlling the waveform generator to synthesize output signals of corresponding frequencies through the SPI interface of the core board.
Preferably, the signal control FPGA adopts a chip XC6SLX9, a VCCAUX port of the chip XC6SLX9 is connected to a first low-power-consumption switching power supply chip, and a VCCINT port is connected to a second low-power-consumption switching power supply chip and is further connected to a storage chip. Controlling an audio source to generate frequency signals in different states through the SPI; the signal control FPGA generates different reference frequency clock signals to be provided for an audio source; the signal controls the FPGA to count frequency signals; the signal controls the FPGA to generate control signals under various states.
Preferably, the digital down-conversion FPGA adopts a chip XC6SLX150, a VCCINT port of the chip XC6SLX150 is connected to a PFM/PWM synchronous buck converter, and a VCCAUX port is connected to a third low-power-consumption switching power supply chip. The analysis processing of the intermediate frequency signal is realized, the analysis calculation of the received signal is completed together with the core board system, the signal analysis under each communication and detection mode is completed, and the demodulation work of the down-conversion is that the completed demodulation work comprises the demodulation and the decoding of the biphase L burst modulation signal with AM, FM, SSB and a code element transmission rate of 480 bps.
Preferably, the intermediate frequency sampling module is composed of a core chip LTC2245, an FPGA and peripheral devices, the analog intermediate frequency signal is sampled by the high-speed analog-to-digital converter LTC2245 to be digitized, and the digitized intermediate frequency signal is down-converted by the FPGA to obtain a baseband signal. Then, the signal is extracted and filtered to obtain I, Q components of the signal under different bandwidths; and simultaneously carrying out amplitude demodulation and frequency discrimination on the signals to obtain amplitude modulation or frequency modulation demodulation signals, and then sending the signals to a functional processing unit for analysis and processing.
Preferably, the signal voltage measurement module enters the core processing unit for analysis processing after the external signal voltage is sampled by the LTC1867, and outputs a corresponding measurement parameter.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts a core board SOM-TL138, the communication speed can be up to 228MByte/s, the dominant frequency 456MHz can be up to the operational capability of 3648MIPS and 2746MFLOPS, the XilinxSpartan-6XC6SLX9/16/25/45 is compatible, the platform upgrading capability is strong, the bare computer, an SYS/BIOS operating system and a Linux operating system are supported, the communication control is carried out through an onboard IO port, an upp data bus, an EMIF data bus, an SPI serial port, an LAN port and an RS232 port, and after receiving and sending various commands, each functional module of the tester is controlled to control various working states of the whole machine, and simultaneously, the data measured in the modules are sent to a microcomputer for display after being calculated and processed, the collection of various measuring functions is realized, various signals can be measured, and the portable communication and navigation tester comprising the circuit can be used for communication and overhaul of airplanes, ships and the like.
Description of the drawings:
fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic circuit connection diagram of the SOM-TL138 core board.
FIG. 3 is a schematic diagram of the electrical connections of the I/O interface of the core board.
Fig. 4 is a schematic circuit diagram of the RS232 interface of the core board.
Fig. 5 is a circuit connection schematic of the DAC of the core board.
FIG. 6 is a circuit connection schematic diagram of the signal control FPGA.
Fig. 7 is a circuit connection schematic of the intermediate frequency sampling module.
Fig. 8 is a schematic circuit connection diagram of the digital down-conversion FPGA and the switching power supply chip.
Fig. 9 is a circuit connection schematic of a digital down conversion FPGA.
FIG. 10 is a schematic diagram of a circuit connection configuration of the portable communication and navigation tester.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Fig. 10 is a schematic block diagram of the overall design of the portable communication and navigation tester, wherein how to process signals input by the rf front-end unit is a difficult point in the design of the portable communication and navigation tester.
As shown in fig. 1, a signal processing unit of a portable communication and navigation tester includes a core board, an intermediate frequency sampling module, a signal control FPGA, a digital down-conversion FPGA, an audio signal generating module, a signal voltage measuring module, and a power conversion module;
the core board receives and sends various commands of the signal control FPGA through an uPP line, an SPI line and an EMIF line; the core board is connected with a network interface through a LAN (local area network) line; the core board is connected with the digital down-conversion FPGA through an IO line; the core board is connected with the switch control and serial port module through an RS232 line, so that communication conversion control of the system and external equipment is realized;
the audio generation module receives a command of controlling the FPGA by the signal through an SPI line and synthesizes audio output with specified frequency according to the command of controlling the FPGA by the signal;
the digital down-conversion FPGA digitizes the sampled signal; the digital down-conversion FPGA is connected with the signal voltage measuring module;
the DC voltage input from outside enters the processing board, and the power conversion part generates the +5.0V, +3.3V, +2.5V, +1.2V, -5.0V and other working voltages required by the module. The externally input DC voltage is used by the processing board itself and is also used for transferring and outputting the radio frequency unit.
As shown in fig. 2, fig. 3, fig. 4 and fig. 5, the core board includes an SOM-TL138 core board part, which controls each function module of the instrument to control various working states of the whole instrument after performing communication control through an onboard IO port, an upp data bus, an EMIF data bus, an SPI serial port, a LAN port and an RS232 port, and receiving and sending various commands, and sends data measured from the modules to a microcomputer to be displayed after being calculated.
The audio signal generation module comprises an AD9833, and the AD9833 is controlled by the SPI interface of the core board in a programming mode to synthesize output signals of corresponding frequencies.
As shown in fig. 6, the signal control FPGA adopts a chip XC6SLX9, and generates frequency signals in different states through an SPI control audio signal generation module; the signal control FPGA generates different reference frequency clock signals to be provided for an audio source; the signal controls the FPGA to count frequency signals; the signal controls the FPGA to generate control signals under various states.
As shown in fig. 8 and 9, the digital down-conversion FPGA employs a chip XC6SLX150 to analyze and process the intermediate frequency signal, and completes analysis and calculation of the received signal together with the core board system, thereby completing signal analysis in each communication and detection mode. The down-conversion demodulates and decodes the resulting demodulated bi-phase L burst modulated signal with AM, FM, SSB and a symbol transmission rate of 480 bps.
As shown in fig. 7, the intermediate frequency sampling module is composed of a core chip LTC2245, an FPGA and peripheral devices, the analog intermediate frequency signal is sampled by a high-speed analog-to-digital converter LTC2245 to be digitized, the digitized intermediate frequency signal is down-converted by the FPGA to obtain a baseband signal, and then the baseband signal is extracted and filtered to obtain I, Q components of the signal under different bandwidths; and simultaneously carrying out amplitude demodulation and frequency discrimination on the signals to obtain amplitude modulation or frequency modulation demodulation signals, and then sending the signals to a functional processing unit for analysis and processing.
And in the signal voltage measurement module, after external signal voltage is sampled by the LTC1867, the external signal voltage enters the core processing unit for analysis and processing, and corresponding measurement parameters are output.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A signal processing unit of a portable communication and navigation tester is characterized by comprising a core board, an intermediate frequency sampling module, a signal control FPGA, a digital down-conversion FPGA, an audio signal generating module, a signal voltage measuring module and a power supply conversion module;
the core board receives and sends various commands of the signal control FPGA through an uPP line, an SPI line and an EMIF line; the core board is connected with a network interface through a LAN (local area network) line; the core board is connected with the digital down-conversion FPGA through an IO line; the core board is connected with the switch control and serial port module through an RS232 line, so that communication conversion control of the system and external equipment is realized;
the signal control FPGA controls the audio signal generation module to generate a frequency signal through the SPI;
the audio generation module receives a command of controlling the FPGA by the signal through an SPI line and synthesizes audio output with specified frequency according to the command of controlling the FPGA by the signal;
the intermediate frequency sampling module samples the received external audio signal and transmits the external audio signal to the digital down-conversion FPGA;
the digital down-conversion FPGA digitizes the sampled signal; the digital down-conversion FPGA is connected with the signal voltage measuring module;
the DC voltage input from the outside enters the power conversion module, and the power conversion module generates working voltage and supplies power to each module.
2. The signal processing unit of claim 1, wherein the core board is a chip SOM-TL 138.
3. The signal processing unit of claim 1, wherein the audio signal generating module comprises a waveform generator AD 9833.
4. The signal processing unit of a portable communication and navigation tester as claimed in claim 1, wherein the signal control FPGA employs a chip XC6SLX9, the VCCAUX port of the chip XC6SLX9 is connected to a first low power consumption switching power supply chip, the VCCINT port is connected to a second low power consumption switching power supply chip, and a memory chip is further connected.
5. The signal processing unit of a portable communication and navigation tester as claimed in claim 1, wherein the digital down-conversion FPGA employs a chip XC6SLX150, a PFM/PWM synchronous buck converter is connected to a VCCINT port of the chip XC6SLX150, and a third low-power switching power supply chip is connected to a VCCAUX port.
6. The signal processing unit of claim 1, wherein the intermediate frequency sampling module comprises a high speed analog-to-digital converter LTC2245 and an FPGA, the analog intermediate frequency signal is digitized by sampling the high speed analog-to-digital converter LTC2245, and the digitized intermediate frequency signal is down-converted by the FPGA to obtain a baseband signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348278.7A CN110890925A (en) | 2019-12-24 | 2019-12-24 | Signal processing unit of portable communication and navigation tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348278.7A CN110890925A (en) | 2019-12-24 | 2019-12-24 | Signal processing unit of portable communication and navigation tester |
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| Publication Number | Publication Date |
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| CN110890925A true CN110890925A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911348278.7A Withdrawn CN110890925A (en) | 2019-12-24 | 2019-12-24 | Signal processing unit of portable communication and navigation tester |
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| CN (1) | CN110890925A (en) |
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- 2019-12-24 CN CN201911348278.7A patent/CN110890925A/en not_active Withdrawn
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Application publication date: 20200317 |