CN108111191B - Method and device for generating simulation excitation source signal - Google Patents
Method and device for generating simulation excitation source signal Download PDFInfo
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- CN108111191B CN108111191B CN201711345696.1A CN201711345696A CN108111191B CN 108111191 B CN108111191 B CN 108111191B CN 201711345696 A CN201711345696 A CN 201711345696A CN 108111191 B CN108111191 B CN 108111191B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/71632—Signal aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/717—Pulse-related aspects
Abstract
The invention discloses a method for generating a simulation excitation source signal, which comprises the steps of receiving an input analog signal and carrying out signal preprocessing on the input analog signal; converting the input analog signal into a first digital signal with a first preset sampling rate, and performing quadrature down-conversion and filtering extraction processing on the first digital signal to obtain a second digital signal with a second preset sampling rate; writing the second digital signal to a memory in dataform; reading the second digital signal from the memory in data form; and carrying out orthogonal up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal. Correspondingly, the invention also provides equipment for generating the simulation excitation source signal. The invention can completely reserve various waveform characteristics of the original signal, ensures the integrity and accuracy of maintenance test and has high adaptability.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for generating an artificial excitation source signal.
Background
With the continuous development of the ultra-short wave communication technology, a large number of ultra-short wave digital radio stations are equipped with troops. Because the technical system of the ultra-short wave digital radio station, such as baseband signals, signal coding, intermediate frequency modulation and other key contents related to waveform characteristics belong to the core technology of enterprises, radio station equipment manufacturers do not disclose the key contents to the outside due to the need of protecting intellectual property rights, so that test equipment manufacturers are difficult to develop excitation signal sources with the same technical system and consistent waveform characteristics, maintenance personnel are difficult to maintain equipment and cannot perform targeted performance test on the maintenance equipment.
At present, in order to meet the requirement of maintenance and test of an ultrashort wave digital radio station, when a signal excitation source is developed, some test equipment manufacturers embed a special signal module provided by the radio station equipment manufacturers in a system, and some test equipment manufacturers use related signal generation modules in the radio station in a disassembling mode so as to solve the problem of radio station signal generation of the same technical system. The inventor finds the following problems in developing a signal excitation source by adopting the technical approach:
(1) the requirement that the performance index of the instrument and equipment is at least one order of magnitude higher than that of the equipment to be tested cannot be met;
(2) the purchasing cost of parts is high, the risk of goods sources is large, and the life cycle of products is short;
(3) the core technology is uncontrollable, the product smooth technology upgrading cannot be realized, and the adaptability to the change of the tested equipment is poor.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for generating a simulation excitation source signal, which can completely reserve various waveform characteristics of an original signal, ensure the integrity and accuracy of maintenance test and have high adaptability.
An embodiment of the present invention provides a method for generating a simulated excitation source signal, including:
receiving an input analog signal, and performing signal preprocessing on the input analog signal;
converting the input analog signal into a first digital signal with a first preset sampling rate, and performing quadrature down-conversion and filtering extraction processing on the first digital signal to obtain a second digital signal with a second preset sampling rate;
writing the second digital signal to a memory in dataform;
reading the second digital signal from the memory in data form;
and carrying out orthogonal up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal.
Further, the first preset sampling rate is an integral multiple of the signal bandwidth and is not less than 960 times of the signal bandwidth;
the second preset sampling rate is an integral multiple of the signal bandwidth and is not less than 64 times of the signal bandwidth;
the sampling rate of the simulation excitation source signal is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal.
Further, the signal preprocessing comprises filtering processing and level adjustment.
Further, the memory is a non-volatile mass memory.
Further, the method also comprises the following steps:
sending the stored second digital signal to a communication interface used for connecting external equipment through the memory so as to be transmitted to the external equipment through the communication interface for storage;
and receiving the second digital signal sent by the external equipment through the communication interface, and transmitting the second digital signal back to the memory for storage.
Accordingly, another embodiment of the present invention provides an apparatus for generating an artificial stimulus signal, comprising:
the analog signal front end unit is used for receiving an input analog signal and carrying out signal preprocessing on the input analog signal;
the second digital signal acquisition unit is used for converting the input analog signal into a first digital signal with a first preset sampling rate and performing quadrature down-conversion and filtering extraction processing on the first digital signal to obtain a second digital signal with a second preset sampling rate;
the memory unit comprises a writing module, a reading module and a memory, wherein the writing module is used for writing the second digital signal into the memory in a data form; the reading module is used for reading the second digital signal from the memory in a data form; the memory is used for storing the second digital signal in a data form;
and the simulation excitation source signal unit is used for carrying out orthogonal up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal.
Further, the first preset sampling rate is an integral multiple of the signal bandwidth and is not less than 960 times of the signal bandwidth;
the second preset sampling rate is an integral multiple of the signal bandwidth and is not less than 64 times of the signal bandwidth;
the sampling rate of the simulation excitation source signal is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal.
Further, the signal preprocessing comprises filtering processing and level adjustment.
Furthermore, the system also comprises a communication interface;
the memory unit is also used for sending the stored second digital signal to the communication interface through the memory;
the communication interface is used for connecting an external device and transmitting the second digital signal received from the memory unit to the external device for storage; and the second digital signal is also used for transmitting the received second digital signal sent by the external equipment to the memory for storage.
Further, the memory is a non-volatile mass memory.
Further, the simulation device further comprises a control unit for controlling the analog signal front end unit, the second digital signal acquisition unit, the memory unit and the simulation excitation source signal unit.
Furthermore, the clock generation synchronization unit is configured to generate a system clock, and provide corresponding clock signals in a clock frequency conversion manner according to the processing rate requirements of each of the second digital signal acquisition unit, the memory unit, and the simulation excitation source signal unit, so as to implement clock synchronization of the second digital signal acquisition unit, the memory unit, and the simulation excitation source signal unit.
Drawings
FIG. 1 is a schematic flow chart diagram of a method for generating a simulated stimulus signal according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for generating an artificial stimulus signal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flowchart of a method for generating a simulated stimulus signal according to an embodiment of the present invention is shown, including:
s1, receiving an input analog signal, and performing signal preprocessing on the input analog signal; wherein, the received input analog signal is the analog signal to be cloned;
s2, converting the input analog signal into a first digital signal with a first preset sampling rate, and performing quadrature down-conversion and filtering decimation processing on the first digital signal to obtain a second digital signal with a second preset sampling rate;
s3, writing the second digital signal into a memory in a data form;
s4, reading the second digital signal from the memory in a data form;
and S5, performing quadrature up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal, wherein the obtained simulation excitation source signal is an analog signal cloned based on the input analog signal.
Further, the preprocessing involved in step S1 includes, but is not limited to, filtering and level adjustment.
Further, in order to ensure that the simulation excitation source signal obtained by the final cloning is not distorted, the first preset sampling rate in step S2 is an integer multiple of the signal bandwidth and is not less than 960 times of the signal bandwidth; the second preset sampling rate in step S2 is an integer multiple of the signal bandwidth and is not less than 64 times the signal bandwidth. The specific first preset sampling rate and the second preset sampling rate can be obtained by design derivation according to the signal processing algorithm and the performance requirement in the design range.
The first preset sampling rate is set to be an integral multiple of the signal bandwidth and not less than 960 times of the signal bandwidth, and the second preset sampling rate is set to be an integral multiple of the signal bandwidth and not less than 64 times of the signal bandwidth, so that the finally obtained simulation excitation source signal is ensured not to be distorted.
Furthermore, in order to ensure that the simulation excitation source signal obtained by final cloning is not distorted, the sampling rate of the simulation excitation source signal is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal. That is, in the process of performing the quadrature up-conversion and the interpolation filtering process on the second digital signal in step S5, it is necessary to ensure that the simulated excitation source signal having the sampling rate that is an integral multiple of the signal bandwidth and is not less than 6 times the frequency of the analog signal can be obtained.
Further, the second digital signal obtained in step S2 is a "zero intermediate Frequency" signal, where the zero intermediate Frequency is a signal that is directly changed from RF (Radio Frequency) to baseband without a modulation and demodulation method of intermediate Frequency, and the second digital signal is changed from RF to baseband without modulation and demodulation of intermediate Frequency.
Further, the memory selected in the steps S3 and S4 is a nonvolatile mass memory. The embodiment adopts a nonvolatile mass memory as a transfer station for signal acquisition and generation, and realizes permanent storage of a clone signal. A signal is acquired through step S3, that is, the digital signal is written into the nonvolatile mass storage; a signal is generated by step S4, i.e., a digital signal is read out from the nonvolatile mass memory.
Further, steps S6 and S7 are included:
s6, sending the stored second digital signal to a communication interface for connecting an external device through the memory, and transmitting the second digital signal to the external device through the communication interface for storage;
and S7, receiving the second digital signal sent by the external device through the communication interface, and transmitting the second digital signal back to the memory for storage.
Further, each step of this embodiment is controlled by an FPGA (Field-Programmable Gate Array) control core, which includes signal level adjustment, signal acquisition and processing, and signal processing and generation.
Further, the communication interface includes a USB interface and an RS-232 interface, and usually, the FPGA control core performs signal data transmission between the nonvolatile mass storage and the external device (e.g., a computer) through the USB interface, and performs operation instruction transmission between the external device (e.g., a computer) and the FPGA control core through the RS-232 interface.
Specifically, on the one hand, the digital signal data stored in the nonvolatile mass storage is transmitted to the hard disk of the external device through the USB port for storage; on the other hand, the digital signal data stored in the hard disk of the external device is transmitted back to the nonvolatile mass memory through the USB port for use by the signal processing and generating part.
In the embodiment, data exchange between the nonvolatile large-capacity memory and the computer hard disk is realized through the USB interface, and digital signal data in the nonvolatile large-capacity memory is uploaded to the computer hard disk or a digital signal file in the computer hard disk is downloaded to the nonvolatile large-capacity memory.
It should be noted that the RS-232 interface is one of the communication interfaces on the personal computer, and has an asynchronous transmission standard interface established by the electronic industry association. Usually, the RS-232 interface appears in the form of 9 pins (DB-9) or 25 pins (DB-25), and two groups of RS-232 interfaces, namely COM1 and COM2, are available on a common personal computer.
In the execution process of each step in this embodiment, the method further includes the steps of: and S0, generating a system clock, and providing a corresponding clock signal in a clock frequency conversion mode according to the processing rate requirement of each step to realize the clock synchronization of each step.
The embodiment provides a brand new signal source implementation approach by aiming at an ultrashort wave digital radio station with unknown technical system and waveform characteristics and adopting a 'black box' method and a 'clone' technology to generate a completely consistent modulation signal waveform in a simulation mode to serve as a signal excitation source for radio station maintenance test, and the method is an innovative breakthrough in the technical field of signal source instruments.
Firstly, the signal excitation source realized by the 'black box' method can restore the signal waveform without distortion under the condition that the signal technical system of a maintenance test object is unknown, thereby not only avoiding the technical barriers of radio station equipment manufacturers, but also not infringing the intellectual property of the radio station manufacturers.
Secondly, various waveform characteristics of the original signal are completely reserved through a signal excitation source realized by a cloning technology, and the integrity and the accuracy of maintenance test are ensured.
Thirdly, a black box method is adopted to simulate and generate signal waveforms, no special limitation and special requirements are imposed on a clone object, and the method can adapt to ultra-short wave digital radio stations of various technical systems.
In specific implementation, firstly, an input analog signal is received through step S1 for preprocessing, including filtering processing and level adjustment, then analog-to-digital conversion, digital down-conversion, digital filtering and extraction of the input analog signal are completed through step S2 to obtain a second digital signal, then the second digital signal is stored through step S3, reading is performed through step S4, and finally the read second digital signal is subjected to inverse transformation of the processing of step S2 through step S5, so that cloning is achieved to obtain an artificial excitation source signal; in the execution process of each step, a system clock is generated through step S0 to realize clock synchronization of steps S1 to S5. In addition, data communication between the memory and the external device may be also accomplished through steps S6 and S7.
The embodiment can completely reserve various waveform characteristics of the original signal, ensures the integrity and accuracy of maintenance test and has high adaptability.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an apparatus for generating an artificial stimulus signal according to an embodiment of the present invention, including:
the analog signal front end unit 1 is used for receiving an input analog signal and performing signal preprocessing on the input analog signal;
a second digital signal obtaining unit 2, configured to convert the input analog signal into a first digital signal with a first preset sampling rate, and perform quadrature down-conversion and filtering decimation processing on the first digital signal to obtain a second digital signal with a second preset sampling rate,
the memory unit 3 comprises a writing module 31, a reading module 32 and a memory 33, wherein the writing module 31 is used for writing the second digital signal into the memory in a data form; the reading module 32 is configured to read the second digital signal from the memory in a data form; the memory 33 is used for storing the second digital signal in a data form;
and the simulation excitation source signal unit 4 is used for performing orthogonal up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal.
Further, the pre-processing involved in the analog signal front-end unit 1 includes, but is not limited to, filtering and level adjustment.
Further, in order to ensure that the simulation excitation source signal obtained by the final cloning is not distorted, the first preset sampling rate in the second digital signal acquisition unit 2 is an integral multiple of the signal bandwidth and is not less than 960 times of the signal bandwidth; the second preset sampling rate in the second digital signal obtaining unit 2 is an integer multiple of the signal bandwidth and is not less than 64 times of the signal bandwidth. The specific first preset sampling rate and the second preset sampling rate can be obtained by design derivation according to the signal processing algorithm and the performance requirement in the design range.
The first preset sampling rate is set to be an integral multiple of the signal bandwidth and not less than 960 times of the signal bandwidth, and the second preset sampling rate is set to be an integral multiple of the signal bandwidth and not less than 64 times of the signal bandwidth, so that the finally obtained simulation excitation source signal is ensured not to be distorted.
Furthermore, in order to ensure that the simulation excitation source signal obtained by final cloning is not distorted, the sampling rate of the simulation excitation source signal is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal. That is, in the process of performing quadrature up-conversion and interpolation filtering processing on the second digital signal in the artificial excitation source signal unit 4, it is necessary to ensure that the artificial excitation source signal having the sampling rate that is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal can be obtained.
Further, the second digital signal obtained by the second digital signal obtaining unit 2 is a "zero intermediate Frequency" signal, where the zero intermediate Frequency is a signal directly changed from RF (Radio Frequency) to baseband without a modulation and demodulation method of intermediate Frequency, where the second digital signal is changed from RF to baseband without modulation and demodulation of intermediate Frequency.
Further, the memory selected in the memory unit 3 is a nonvolatile mass memory. The embodiment adopts a nonvolatile mass memory as a transfer station for signal acquisition and generation, and realizes permanent storage of a clone signal. Acquiring a signal through the writing module 31, namely writing the digital signal into the nonvolatile mass storage; the signal is generated by the read module 32, i.e. the digital signal is read out from the non-volatile mass memory.
Further, the device also comprises a communication interface 5;
the memory unit 3 is further configured to send the stored second digital signal to the communication interface 5 through the memory 33;
the communication interface 5 is used for connecting an external device and transmitting the second digital signal received from the memory unit 3 to the external device for storage; and also for the received second digital signal sent by the external device to be transmitted back to the memory 33 of the memory unit 3 for storage.
Further, the analog signal front end unit 1, the second digital signal acquisition unit 2, the memory unit 3 and the artificial excitation source signal unit 4 are controlled by a control unit 6.
The control unit 6 controls with an FPGA (Field-Programmable Gate Array) as a control core, and includes controlling the analog signal front-end unit 1, the second digital signal acquisition unit 2, the memory unit 3, and the artificial excitation source signal unit 4.
Further, the communication interface 5 includes a USB interface and an RS-232 interface, and generally, the FPGA control core performs signal data transmission between the nonvolatile mass storage and the external device (e.g., a computer) through the USB interface, and performs operation instruction transmission between the external device (e.g., a computer) and the FPGA control core through the RS-232 interface.
Specifically, on the one hand, the digital signal data stored in the nonvolatile mass storage 3 is transmitted to the hard disk of the external device through the USB port for storage; on the other hand, the digital signal data stored in the hard disk of the external device is transmitted back to the nonvolatile mass memory through the USB port for use by the signal processing and generating part.
In the embodiment, data exchange between the nonvolatile large-capacity memory and the computer hard disk is realized through the USB interface, and digital signal data in the nonvolatile large-capacity memory is uploaded to the computer hard disk or a digital signal file in the computer hard disk is downloaded to the nonvolatile large-capacity memory.
It should be noted that the RS-232 interface is one of the communication interfaces on the personal computer, and has an asynchronous transmission standard interface established by the electronic industry association. Usually, the RS-232 interface appears in the form of 9 pins (DB-9) or 25 pins (DB-25), and two groups of RS-232 interfaces, namely COM1 and COM2, are available on a common personal computer.
In the execution process of each step in this embodiment, the apparatus further includes a clock generation synchronization unit 7, configured to generate a system clock, and provide a corresponding clock signal in a clock frequency conversion manner according to the processing rate requirements of each unit of the second digital signal acquisition unit, the memory unit, and the artificial excitation source signal unit, so as to implement clock synchronization of the second digital signal acquisition unit, the memory unit, and the artificial excitation source signal unit.
The embodiment provides a brand new signal source implementation approach by aiming at an ultrashort wave digital radio station with unknown technical system and waveform characteristics and adopting a 'black box' method and a 'clone' technology to generate a completely consistent modulation signal waveform in a simulation mode to serve as a signal excitation source for radio station maintenance test, and the method is an innovative breakthrough in the technical field of signal source instruments.
Firstly, the signal excitation source realized by the 'black box' method can restore the signal waveform without distortion under the condition that the signal technical system of a maintenance test object is unknown, thereby not only avoiding the technical barriers of radio station equipment manufacturers, but also not infringing the intellectual property of the radio station manufacturers.
Secondly, various waveform characteristics of the original signal are completely reserved through a signal excitation source realized by a cloning technology, and the integrity and the accuracy of maintenance test are ensured.
Thirdly, a black box method is adopted to simulate and generate signal waveforms, no special limitation and special requirements are imposed on a clone object, and the method can adapt to ultra-short wave digital radio stations of various technical systems.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A method of generating a simulated stimulus signal, comprising:
receiving an input analog signal, and performing signal preprocessing on the input analog signal;
converting the input analog signal into a first digital signal with a first preset sampling rate, and performing quadrature down-conversion and filtering extraction processing on the first digital signal to obtain a second digital signal with a second preset sampling rate;
writing the second digital signal to a memory in dataform;
reading the second digital signal from the memory in data form;
carrying out orthogonal up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal;
the first preset sampling rate is an integral multiple of the signal bandwidth and is not less than 960 times of the signal bandwidth; the second preset sampling rate is an integral multiple of the signal bandwidth and is not less than 64 times of the signal bandwidth, and the sampling rate of the simulation excitation source signal is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal.
2. The method of generating an emulated stimulus signal of claim 1, wherein the memory is a non-volatile mass memory.
3. The method of generating a simulated stimulus signal of claim 1, further comprising:
sending the stored second digital signal to a communication interface used for connecting external equipment through the memory so as to be transmitted to the external equipment through the communication interface for storage;
and receiving the second digital signal sent by the external equipment through the communication interface, and transmitting the second digital signal back to the memory for storage.
4. An apparatus for generating an artificial stimulus signal, comprising:
the analog signal front end unit is used for receiving an input analog signal and carrying out signal preprocessing on the input analog signal;
the second digital signal acquisition unit is used for converting the input analog signal into a first digital signal with a first preset sampling rate and performing quadrature down-conversion and filtering extraction processing on the first digital signal to obtain a second digital signal with a second preset sampling rate;
the memory unit comprises a writing module, a reading module and a memory, wherein the writing module is used for writing the second digital signal into the memory in a data form; the reading module is used for reading the second digital signal from the memory in a data form; the memory is used for storing the second digital signal in a data form;
the simulation excitation source signal unit is used for carrying out orthogonal up-conversion and interpolation filtering processing on the second digital signal to obtain a simulation excitation source signal;
the control unit is used for controlling the analog signal front-end unit, the second digital signal acquisition unit, the memory unit and the simulation excitation source signal unit;
the first preset sampling rate is an integral multiple of a signal bandwidth and is not less than 960 times of the signal bandwidth, the second preset sampling rate is an integral multiple of the signal bandwidth and is not less than 64 times of the signal bandwidth, and the sampling rate of the simulation excitation source signal is an integral multiple of the signal bandwidth and is not less than 6 times of the frequency of the analog signal.
5. The apparatus of claim 4, wherein the signal preprocessing comprises filtering and level adjustment.
6. The apparatus for generating an emulated stimulus signal of claim 4, further comprising a communication interface;
the memory unit is also used for sending the stored second digital signal to the communication interface through the memory;
the communication interface is used for connecting an external device and transmitting the second digital signal received from the memory unit to the external device for storage; and the second digital signal is also used for transmitting the received second digital signal sent by the external equipment to the memory for storage.
7. The apparatus of claim 4, wherein the memory is a non-volatile mass memory.
8. The apparatus of claim 4, wherein the clock generation synchronization unit is configured to generate a system clock and provide the corresponding clock signals via clock frequency conversion according to the processing rate requirements of the second digital signal acquisition unit, the memory unit and the artificial stimulus source signal unit to achieve clock synchronization of the second digital signal acquisition unit, the memory unit and the artificial stimulus source signal unit.
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