CN105323019A - Signal processing circuit for radio comprehensive test instrument - Google Patents
Signal processing circuit for radio comprehensive test instrument Download PDFInfo
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- CN105323019A CN105323019A CN201510865955.8A CN201510865955A CN105323019A CN 105323019 A CN105323019 A CN 105323019A CN 201510865955 A CN201510865955 A CN 201510865955A CN 105323019 A CN105323019 A CN 105323019A
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Abstract
The invention provides a signal processing circuit for a radio comprehensive test instrument. The signal processing circuit comprises a control module, an intermediate frequency generating module, an intermediate frequency measuring module, an audio generating module and an audio measuring module; the intermediate frequency generating module is connected with the control module by virtue of an SPI bus and used for generating an intermediate frequency of a specific frequency and outputting the generated intermediate frequency according to an order of the control module; the intermediate frequency measuring module is connected with the control module by virtue of an EMIF bus and used for digitally sampling and analyzing the received intermediate frequency signal by virtue of a digital sampling way; the audio generating module is connected with the control module by virtue of the SPI bus and used for synthesizing an audio of a specific frequency and outputting the synthesized audio according to the order of the control module; the audio measuring module is connected with the control module by virtue of the EMIF bus and used for sampling and analyzing the received audio signal. By adopting the signal processing circuit, the integration of various measuring functions is realized, so that the comprehensive test instrument comprising the circuit can be used for measuring various radio signals.
Description
Technical field
The present invention relates to electronic measuring instrument, particularly a kind of signal processing circuit for radio comprehensive measurement instrument.
Background technology
Adopt single test at communicator field test instrument at present, instrument is only measured a few functions, can not realize the measurement of several functions, and accordingly, the signal processing circuit part of existing tester also 2 only can carry out Measurement and analysis to discrete function.
Summary of the invention
The present invention to the problem of the measurement of several functions on same instrument, must not provide a kind of signal processing circuit for radio comprehensive measurement instrument in order to solution.
For solving the problems of the technologies described above, the invention provides following technical scheme:
For a signal processing circuit for radio comprehensive measurement instrument, comprise control module, intermediate frequency generation module, intermediate frequency measurement module, audio frequency generation module and audio frequency measurement module; ;
Described intermediate frequency generation module is connected by spi bus with described control module, and it generates the intermediate frequency of assigned frequency for the order according to control module and export;
Described intermediate frequency measurement module is connected it with described control module by EMIF bus and carries out digitized sampling, analysis for the mode by digital sample to the intermediate-freuqncy signal received;
Described audio frequency generation module is connected with described control module by spi bus, and its audio frequency for the order synthesis assigned frequency according to control module also exports;
Described audio frequency measurement module is connected with described control module by EMIF bus, and it is for sampling to the audio signal received, analyzing.
Further, described signal processing circuit also comprises input module and display module; Described input module and display module are connected with described control module;
Described input module is keyboard, and it is for user input instruction;
Described display module is for the test result of the setting or comprehensive tester that show user.
Further, described signal processing circuit also comprises the interface control module be connected with processing module; Described interface control module comprises serial communication modular and CPLD communication module; Described serial communication modular is used for the communication connection of described processing module and PC; Described CPLD communication module is used for described processing module and EMIF bus, the decoding of spi bus is changed.
Compared with prior art, present invention achieves the set of multiple measurement function, the comprehensive tester comprising this circuit can be made to realize the measurement of multiple radio signal.
Accompanying drawing explanation
Accompanying drawing 1 is signal processing circuit structure block diagram provided by the invention.
Accompanying drawing 2 is comprehensive tester structured flowcharts.
Embodiment
Below with reference to the accompanying drawings 1, accompanying drawing 2 couples of the present invention carry out embodiment and make brief description.
For a signal processing circuit for radio comprehensive measurement instrument, comprise control module 1(and specifically adopt ICETEK-OMAPL138-KB chip), intermediate frequency generation module 3, intermediate frequency measurement module 2, audio frequency generation module 5 and audio frequency measurement module 4;
Described intermediate frequency generation module 3 is connected by spi bus with described control module 1, and it generates the intermediate frequency of assigned frequency for the order according to control module 1 and export; In the present embodiment, intermediate frequency generation module 3 adopts the monolithic DDS chips of Maxim and peripheral circuit thereof to realize; The major peripheral circuit of DDS chip comprises derived reference signal, control, loop filter and output low pass filter etc.; DDS chip has 4 kinds of mode of operations available, is single-tone pattern, RAM modulating mode, digital ramp modulating mode and parallel data port modulating mode respectively.Directly carrier signal is produced by configuration DDS control register; Internal modulation signal is realized by the Wave data etc. of 1024 × 32 RAM in configuration DDS; The external modulation Wave data directly gathered by outside ADC realizes the external modulation function of signal through the input of DDS parallel port.These configurations are control module 1 and are sent to this DDS chip by spi bus.
Described intermediate frequency measurement module 2 is connected it with described control module 1 by EMIF bus and carries out digitized sampling, analysis for the mode by digital sample to the intermediate-freuqncy signal received; It is made up of acp chip AD and low-converter and peripheral components, analog if signal realizes digitlization by high speed analog-to-digital converter LTC2249 sampling, through low-converter, down-conversion is carried out to the intermediate-freuqncy signal after digitlization and obtain baseband signal, afterwards this signal is extracted, filtering, obtain I, the Q component of signal under different bandwidth; Amplitude demodulation and frequency discrimination are carried out to this signal simultaneously, obtain amplitude modulation or fm demodulation signal, then these signals are delivered to after multi-functional processing unit carries out analyzing and processing and be sent to control module 1.
Described audio frequency generation module 5 is connected with described control module by spi bus, and its audio frequency for the order synthesis assigned frequency according to control module 1 also exports; Described audio frequency generation module 5 is made up of chip audio DDS chip; It has two pieces respectively as audio-frequency generator I and audio-frequency generator II composition, and its SPI interface programming by control module 1 controls the output signal of audio frequency DDS chip synthesis corresponding frequencies
Described audio frequency measurement module 4 is connected with described control module by EMIF bus, and it completes after sampling to the external audio signal received through AD, enters multi-functional processing unit and carries out analyzing and processing, and export corresponding measurement parameter and waveform by display module 7.
Further, described signal processing circuit also comprises input module 6 and display module 7; Described input module 6 and display module 7 are connected with described control module 2;
Described input module 6 is keyboard, and it is for user input instruction;
Described display module 7 is for the test result of the setting or comprehensive tester that show user.
Further, described signal processing circuit also comprises the interface control module 8 be connected with processing module 1; Described interface control module 8 comprises serial communication modular 81 and CPLD communication module 82; Described serial communication modular 81 is for the communication connection of described processing module 1 with PC; When being connected with PC, control module 1 receives the control command of PC, enters corresponding mode of operation, and described control module 1 also sends corresponding measurement result by PC requirement.(baud rate is fixed as 115200Bps, no parity check position, 8 bit data positions, 1 position of rest, and serial line interface adopts 3 line systems, and namely data receipts (RXD), data send out (TXD) and ground (GND).）
Described CPLD communication module 82 is changed with the decoding of EMIF bus, spi bus for described processing module 1; Described CPLD communication module mainly comprise conversion encoded control EMIA bus export, SPI export control, switching value array export and uPP reading sequential.Switching value array exports control N404, N903(difference amplifier respectively), D401(AD converter), D901(AD converter) etc.; SPI exports after decoding, controls audio frequency generation module, if sampling digital module, intermediate frequency generation module etc. respectively.。
The modules of described control module 1 pair of instrument controls, monitors and measure display.Wherein by EMIF bus, intermediate frequency measurement module 2 and audio frequency measurement module 4 are read, by spi bus, intermediate frequency generation module 3, audio frequency generation module 5 are controlled; Described control module 1 be also responsible for the reading of AD converter data, to some peripheral circuits by SPI, I2C and EMIF bus marco through CPLD communication module 82(D301) control RF analysis module, frequency signal measurement, intermediate frequency demodulation digital independent, the control of audio frequency measuring circuit etc.
Embodiments of the present invention are not limited to above embodiment, and the various changes made under the prerequisite not departing from present inventive concept all belong to protection scope of the present invention.
Claims (3)
1. for a signal processing circuit for radio comprehensive measurement instrument, it is characterized in that: comprise control module, intermediate frequency generation module, intermediate frequency measurement module, audio frequency generation module and audio frequency measurement module; ;
Described intermediate frequency generation module is connected by spi bus with described control module, and it generates the intermediate frequency of assigned frequency for the order according to control module and export;
Described intermediate frequency measurement module is connected it with described control module by EMIF bus and carries out digitized sampling, analysis for the mode by digital sample to the intermediate-freuqncy signal received;
Described audio frequency generation module is connected with described control module by spi bus, and its audio frequency for the order synthesis assigned frequency according to control module also exports;
Described audio frequency measurement module is connected with described control module by EMIF bus, and it is for sampling to the audio signal received, analyzing.
2., as claimed in claim 1 for the signal processing circuit of radio comprehensive measurement instrument, it is characterized in that: described signal processing circuit also comprises input module and display module; Described input module and display module are connected with described control module;
Described input module is keyboard, and it is for user input instruction;
Described display module is for the test result of the setting or comprehensive tester that show user.
3., as claimed in claim 1 for the signal processing circuit of radio comprehensive measurement instrument, it is characterized in that: described signal processing circuit also comprises the interface control module be connected with processing module; Described interface control module comprises serial communication modular and CPLD communication module; Described serial communication modular is used for the communication connection of described processing module and PC; Described CPLD communication module is used for described processing module and EMIF bus, the decoding of spi bus is changed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510865955.8A CN105323019A (en) | 2015-12-01 | 2015-12-01 | Signal processing circuit for radio comprehensive test instrument |
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| CN201510865955.8A CN105323019A (en) | 2015-12-01 | 2015-12-01 | Signal processing circuit for radio comprehensive test instrument |
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| CN105323019A true CN105323019A (en) | 2016-02-10 |
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| CN201510865955.8A Pending CN105323019A (en) | 2015-12-01 | 2015-12-01 | Signal processing circuit for radio comprehensive test instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105938191A (en) * | 2016-06-27 | 2016-09-14 | 芜湖航飞科技股份有限公司 | Secondary radar emission radio frequency assembly function tester apparatus |
| CN109391287A (en) * | 2018-12-18 | 2019-02-26 | 成都前锋电子仪器有限责任公司 | Signal processing unit for radio integration test module |
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| CN205160537U (en) * | 2015-12-01 | 2016-04-13 | 成都前锋电子仪器有限责任公司 | A processing circuit for radio comprehensive tester |
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| CN2590291Y (en) * | 2002-12-12 | 2003-12-03 | 中国电子科技集团公司第五十四研究所 | Remote-control monitoring device for broadcast signal observation system |
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| CN202150857U (en) * | 2011-05-03 | 2012-02-22 | 牛刚 | Radio station detection module |
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| CN103428136A (en) * | 2013-07-26 | 2013-12-04 | 熊猫电子集团有限公司 | Shortwave information channel modulation-demodulation module based on OMAP chip and Ethernet bus |
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| CN105938191A (en) * | 2016-06-27 | 2016-09-14 | 芜湖航飞科技股份有限公司 | Secondary radar emission radio frequency assembly function tester apparatus |
| CN109391287A (en) * | 2018-12-18 | 2019-02-26 | 成都前锋电子仪器有限责任公司 | Signal processing unit for radio integration test module |
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Application publication date: 20160210 |