CN107819533B - Method and system for creating infinite-time long-wave-shape signal capable of being changed at will - Google Patents
Method and system for creating infinite-time long-wave-shape signal capable of being changed at will Download PDFInfo
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Abstract
The invention relates to the technical field of signal creation, and discloses a method and a system for creating an infinite long-wave form signal which can be randomly changed, wherein the method adopts the system comprising the following steps: the device comprises a clock module, a baseband signal simulator, a combiner and a vector signal modulator, wherein the clock module is connected with the timing module, the baseband signal simulator and the vector signal modulator through signal lines; the timing module is arranged in the main control computer through a PCI socket and is connected with the baseband signal simulator through a signal line; the baseband signal simulator is connected with the combiner through a radio frequency cable; the combiner is connected with the main control computer through a radio frequency cable and a vector signal modulator; the invention controls all the components to work cooperatively through the master control computer, and can realize the signal creation with infinite duration and randomly variable waveform. The mode structure is simple, stable and reliable, strong in universality and high in reusability; the method has the advantages of high construction speed, low implementation difficulty, low development cost and good application prospect.
Description
Technical Field
The invention relates to the technical field of signal creation, in particular to a method and a system for creating an infinite long-wave-shape signal capable of being changed at will.
Background
In many fields of applications such as radar, communication, aerospace, electronic measurement and the like, how to create a signal with an infinite time waveform which can be changed at will is a key technology and a difficult problem which are concerned. Compared with the traditional method for realizing signal creation by adopting FPGA board card programming, the mode for realizing signal creation by the shelf product based on the microwave device has the advantages of simple structure, stability, reliability, short research and development period, strong universality and the like, and gradually becomes one of the main realization modes of the current signal creation.
The basic principle for realizing signal creation based on the microwave device is as follows: firstly, the digital waveform data of the signal is solved by a computer, and the generated data is downloaded to a microwave device which can realize baseband signal simulation and is called as a baseband signal simulator; then, a baseband signal simulator is used for generating a baseband simulation signal, and the baseband simulation signal is transmitted to a microwave device which can realize signal up-conversion vector modulation, and the microwave device is called a vector signal modulator; and finally, carrying out quadrature carrier modulation on the baseband signal through a vector signal modulator to realize up-conversion and output of the signal.
In the signal creation mode, the memory capacity of the baseband signal simulator is limited, and the current mainstream shelf products generally do not exceed 2G sampling points, so that the maximum digital waveform data volume capable of being downloaded at one time is limited. However, the digital waveform data needs to be downloaded in advance before the signal is created, and during the signal creation process, the digital waveform cannot be downloaded continuously, and only the digital waveform downloaded to the memory of the baseband signal simulator is used for generating the signal in a waveform combination and circulating playing manner. Therefore, the waveform of the signal that can be generated is limited by the digital signal waveform that is downloaded in advance into the memory, and the waveform can not be changed at will for an indefinite period of time. Although the signal with the waveform has a good practical value, the signal still has a certain limitation and is difficult to meet the requirements of many applications. For example, when used to create a radar signal, the simulation requirements for a radar-emitting signal may be met, but the simulation requirements for a radar-return signal may not be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a system for creating a signal with infinite long wave shape and random change.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for creating a signal in which an infinite long waveform can be arbitrarily changed, comprising: a clock module, a timing module, a baseband signal simulator, a combiner, a vector signal modulator and a main control computer,
the clock module is connected with the timing module, the baseband signal simulator and the vector signal modulator through signal lines; the timing module is arranged in the main control computer through a PCI socket and is connected with the baseband signal simulator through a signal line; the baseband signal simulator is connected with the combiner through a radio frequency cable; the combiner is connected with the vector signal modulator through a radio frequency cable; the main control computer is connected with the baseband signal simulator and the vector signal modulator through optical fibers;
the clock module generates a clock signal and provides a reference clock for the timing module, the baseband signal simulator and the proper signal generator;
the timing module generates a timing signal according to a control instruction of the main control computer, and provides accurate trigger timing for the baseband signal simulator and the main control computer so as to ensure the synchronization and alternate triggering of two paths of baseband signals;
the baseband signal simulator receives the digital waveform data under the control of the main control computer and generates a baseband analog signal;
the combiner realizes the synthesis of two paths of baseband signals and outputs one path of baseband signal;
the vector signal modulator receives the baseband signal output by the combiner under the control of the main control computer, and performs orthogonal vector modulation according to a set frequency conversion local oscillator to realize signal up-conversion and output.
The main control computer controls the timing module, the baseband signal simulator and the vector signal modulator, generates digital waveform data in a simulation mode, alternately downloads the digital waveform data to the corresponding baseband signal simulator under the control of the timing signal, and simultaneously realizes the operation and visual display of control software.
A method for creating an infinite long-wave-shape randomly-variable signal comprises the steps that a main control computer generates a digital signal with a random waveform, the digital signal is alternately downloaded into two baseband signal simulators, the baseband signal simulators generate baseband analog signals under timing triggering, the two baseband analog signals are combined into one path of orthogonal baseband analog signal through two combiners and input into a vector signal modulator, the vector signal modulator provides a variable-frequency local oscillator to modulate orthogonal vector signals, and creation of a radio-frequency signal with a random variable infinite-time-length waveform is achieved; the method comprises the following steps:
1) the clock module generates a clock signal pulse train with a single frequency according to specific application requirements: 1KHz, 10KHz, 100KHz, 1MHz, 10MHz and 100MHz, and providing uniform high-precision reference clock signals for other components of the system;
2) and the timing module generates a timing trigger signal pulse train according to a timing interval set by the main control computer by referring to the reference clock signal, and sends the trigger signal to the main control computer, the baseband signal simulator 1 and the baseband signal simulator 2 at the same time.
3) After receiving the timing trigger signal, the main control computer calculates the digital waveform data of the signal according to the configuration parameters or the user input parameters; resolving the digital waveform data in a segmentation mode, wherein the length of a segment does not exceed the length of a memory segment of the baseband signal simulator; after the digital waveform data is generated, the main control computer sequentially downloads the digital waveform data into the memory sections of the two baseband signal simulators according to an alternate sequence, and one memory section stores one digital waveform data section;
4) in any timing interval, the main control computer downloads digital waveform data to only one baseband signal simulator and must ensure that the downloaded data is finished in the interval time; after the downloading of the digital waveform data is finished, the main control computer sends working state control codes to the two baseband signal simulators, controls the baseband signal simulators to respond to the working state after the next trigger timing, sets the baseband signal simulators receiving the digital waveform data to be in the working state, and sets the baseband signal simulators not receiving the digital waveform data to be in the standby state;
5) after receiving the timing trigger signal, the baseband signal simulator controls the generation of a baseband signal according to the working state control code received in the last timing interval;
6) after the baseband signal simulator 1 is switched to a working state, playing the signals in the memory section in a sectional combination mode to generate baseband signals;
in the same timing interval, the baseband signal simulator 2 can not generate baseband signals and is switched to a standby state, so that digital waveform data downloaded from the main control computer is received; in the next timing interval, the baseband signal simulator 2 starts to work, and the baseband signal simulator 1 shifts to a standby state, and the two work repeatedly and alternately in the sequence;
the baseband signal simulator generates continuous signals by adopting a segmented combined playing mode, and any segment of signals uses JiAs indicated, the subscript i indicates the number of the signal segment and the baseband signal may be represented as J1J2J3J4...JNN is more than 1, two paths of baseband I/Q signals generated by the baseband signal simulator 1 and the baseband signal simulator 2 are synthesized into 1 path of I/Q signal through a combiner; in two consecutive timing intervals, assuming that the baseband signal simulator 1 operates in the first timing interval, the generated signal is recorded as J1J2J3J4...JNThe baseband signal simulator 2 operates in the second timing interval, and the generated signal can be denoted as JN+1JN+2JNt3JNt4...J2NAfter passing through the combiner, the combiner outputs a complete baseband I/Q signal, which is recorded as J1J2J3J4...J2N；
In order to ensure the continuity of the output signals of the combiner, the baseband signal simulator 1 and the baseband signal simulator 2 are required to adopt the same instrument and the same configuration, and the trigger delay of the two baseband signal simulators needs to be corrected in advance, so that the two signals can be continuously connected and generated;
7) the vector signal modulator receives a baseband signal J input by the combiner1J2J3J4...J2NCarrying out vector signal modulation to realize the output of radio frequency signals which can be recorded as S1S2S3S4...S2NWherein S isiAnd JiCorresponding;
8) under the above-mentioned working mode, the digital waveform is programmed and realized in the main control computer, the shape of the waveform is not limited at all, can realize the digital waveform of arbitrary change, the corresponding signal outputted by the vector signal modulator can be any waveform too; in addition, two baseband signal simulators are adopted to alternately generate baseband signals, and the generation of the baseband signals is not limited by the memory capacity of a single baseband signal simulator, so that the signal creation with infinite duration and waveform capable of being changed randomly is realized.
Due to the adoption of the technical scheme, the invention has the following advantages:
a method for creating an unlimited long-wave-shape randomly-variable signal includes generating a digital signal with random waveform by a main control computer, alternatively downloading the digital signal to two baseband signal simulators, generating a baseband analog signal by the baseband signal simulators under timing trigger, synthesizing a path of orthogonal baseband analog signal by two paths of baseband analog signals through two paths of combiners, inputting the path of orthogonal baseband analog signal to a vector signal modulator, providing a variable-frequency local oscillator by the vector signal modulator, and modulating orthogonal vector signals to create a radio-frequency signal with random variable waveform. The invention has the advantages that:
based on the combination of a general baseband signal simulator and a vector signal modulator, auxiliary modules such as a clock, a timing device, a combiner and the like are added, and a master control computer controls all the components to cooperatively work, so that signal creation with infinite duration and waveform capable of being changed randomly can be realized. The mode has simple structure, stability, reliability, strong universality and high reusability of each component; the system can be quickly constructed by purchasing mature goods shelf products or utilizing the existing instrument, and has the advantages of small realization difficulty, low development cost, short construction period and good application prospect.
Drawings
FIG. 1 is a block diagram of a system for signal creation with an arbitrary variation of the infinite duration waveform;
fig. 2 is a timing diagram of signal creation in which an infinite-duration waveform can be varied arbitrarily.
Detailed Description
The following description of specific embodiments of the present invention is provided to enable those skilled in the art to better understand the present invention. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the present invention.
Fig. 1 is a block diagram of a signal creation system implementing the present invention in which the infinite duration waveform is arbitrarily variable. The system component comprises 1 clock module, 1 timing module, 2 baseband signal simulators (recorded as baseband signal simulator 1 and baseband signal simulator 2), 2 combiners (recorded as combiner 1 and combiner 2), 1 vector signal modulator and 1 main control computer.
The connection relationship among all the components of the system is as follows: the clock module is connected with the timing module, the baseband signal simulator and the vector signal modulator through signal lines; the timing module is arranged in the main control computer through a PCI socket and is connected with the baseband signal simulator through a signal line; the baseband signal simulator is connected with the combiner through a radio frequency cable; the combiner is connected with the vector signal modulator through a radio frequency cable; the main control computer is connected with the baseband signal simulator and the vector signal modulator through optical fibers.
The clock module generates a clock signal and provides a reference clock for the timing module, the baseband signal simulator and the proper signal generator.
The timing module generates a timing signal according to a control instruction of the main control computer, and provides accurate trigger timing for the 2-station baseband signal simulator and the main control computer so as to ensure the synchronization and alternate triggering of the two paths of baseband signals.
The baseband signal simulator receives the digital waveform data under the control of the main control computer and generates a baseband analog signal.
The combiner realizes the synthesis of two paths of baseband signals and outputs one path of baseband signal.
The vector signal modulator receives the baseband signal output by the combiner under the control of the main control computer, and performs orthogonal vector modulation according to a set frequency conversion local oscillator to realize signal up-conversion and output.
The main control computer controls the timing module, the baseband signal simulator and the vector signal modulator, generates digital waveform data in a simulation mode, alternately downloads the digital waveform data to the corresponding baseband signal simulator under the control of the timing signal, and simultaneously realizes the operation and visual display of control software.
Fig. 2 is a timing diagram of signal creation in which an infinite duration waveform can be arbitrarily varied to implement the present invention.
The clock module generates a clock signal pulse train with a single frequency according to specific application requirements, such as 1KHz, 10KHz, 100KHz, 1MHz, 10MHz, 100MHz and the like, and provides a uniform high-precision reference clock signal for other components of the system.
The timing module generates a timing trigger signal pulse train according to a timing interval set by the main control computer by referring to a reference clock signal, and sends a trigger signal to the main control computer, the baseband signal simulator 1 and the baseband signal simulator 2 at the same time.
And after receiving the timing trigger signal, the main control computer calculates the digital waveform data of the signal according to the configuration parameters or the user input parameters. The digital waveform data is resolved in a segmentation mode, and the length of the segment does not exceed the length of the memory segment of the baseband signal simulator. After the digital waveform data is generated, the main control computer sequentially downloads the digital waveform data into the memory sections of the two baseband signal simulators according to an alternate sequence, and one memory section stores one digital waveform data section. In any one timing interval, the main control computer downloads the digital waveform data to only one baseband signal simulator, and the downloaded data is guaranteed to be completed in the interval time. After the digital waveform data is downloaded, the main control computer sends working state control codes to the two baseband signal simulators, controls the baseband signal simulators to respond to the working state after the next trigger timing, sets the baseband signal simulators receiving the digital waveform data to be in the working state, and sets the baseband signal simulators not receiving the digital waveform data to be in the standby state.
And after receiving the timing trigger signal, the baseband signal simulator controls the generation of the baseband signal according to the working state control code received in the last certain time interval. After the baseband signal simulator 1 is switched to a working state, signals in the memory section are played in a sectional combination mode to generate baseband signals. In the same timing interval, the baseband signal simulator 2 does not generate a baseband signal and shifts to a standby state, so that digital waveform data downloaded from the host computer can be received. In the next timing interval, the baseband signal simulator 2 starts operating, and the baseband signal simulator 1 shifts to a standby state, and the two repeatedly operate alternately in this order.
The baseband signal simulator generates continuous signals by adopting a segmented combined playing mode, and any segment of signals can be JiAs indicated, the subscript i indicates the number of the signal segment and the baseband signal may be represented as J1J2J3J4...JN，N＞1,
The two paths of baseband I/Q signals generated by the baseband signal simulator 1 and the baseband signal simulator 2 are synthesized into 1 path of I/Q signal through the combiner. In two consecutive timing intervals, assuming that the baseband signal simulator 1 operates in the first timing interval, the generated signal is recorded as J1J2J3J4...JNThe baseband signal simulator 2 operates in the second timing interval, and the generated signal can be denoted as JN+ 1JNt2JNt3JNt4...J2NAfter passing through the combiner, the combiner outputs a complete baseband I/Q signal, which can be recorded as J1J2J3J4...J2N. In order to ensure the continuity of the output signal of the combiner, the baseband signal simulator 1 and the baseband signal simulator 2 are required to adopt the same instrument and the same configuration, and the trigger delay of the two baseband signal simulators needs to be corrected in advance, so that the two signals can be continuously generated.
The vector signal modulator receives a baseband signal J input by the combiner1J2J3J4...J2NCarrying out vector signal modulation to realize the output of radio frequency signals which can be recorded as S1S2S3S4...S2NWherein S isiAnd JiAnd correspondingly.
In this operating mode, the digital waveform can be programmed in the main control computer, the waveform shape is not limited at all, and a digital waveform with arbitrary change can be realized, and correspondingly, the signal output by the vector signal modulator can also be an arbitrary waveform. In addition, two baseband signal simulators are adopted to alternately generate baseband signals, and the generation of the baseband signals is not limited by the memory capacity of a single baseband signal simulator, so that the signal creation with infinite long-wave waveforms capable of being changed randomly can be realized.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (2)
1. A system for creating a signal in which an infinite long waveform can be arbitrarily changed, comprising: the device comprises a clock module, a timing module, a baseband signal simulator, a combiner, a vector signal modulator and a main control computer, wherein the clock module is connected with the timing module, the baseband signal simulator and the vector signal modulator through signal lines; the timing module is arranged in the main control computer through a PCI socket and is connected with the baseband signal simulator through a signal line; the baseband signal simulator is connected with the combiner through a radio frequency cable; the combiner is connected with the vector signal modulator through a radio frequency cable; the main control computer is connected with the baseband signal simulator and the vector signal modulator through optical fibers;
the clock module generates a clock signal and provides a reference clock for the timing module, the baseband signal simulator and the vector signal modulator;
the timing module generates a timing signal according to a control instruction of the main control computer, and provides accurate trigger timing for the baseband signal simulator and the main control computer so as to ensure the synchronization and alternate triggering of two paths of baseband signals;
the baseband signal simulator receives the digital waveform data under the control of the main control computer and generates a baseband analog signal;
the combiner realizes the synthesis of two paths of baseband signals and outputs one path of baseband signal;
the vector signal modulator receives the baseband signal output by the combiner under the control of the main control computer, and performs orthogonal vector modulation according to a set frequency conversion local oscillator to realize signal up-conversion and output;
the main control computer realizes the control of the timing module, the baseband signal simulator and the vector signal modulator, generates digital waveform data in a simulation way, alternately downloads the digital waveform data to the corresponding baseband signal simulator under the control of the timing signal, and simultaneously realizes the operation and visual display of control software;
the system part comprises 2 base band signal simulators, and in any timing interval, the main control computer downloads digital waveform data to only one base band signal simulator and must ensure that the downloading of the data is completed within the time of the timing interval; after the downloading of the digital waveform data is finished, the main control computer sends working state control codes to the two baseband signal simulators, controls the baseband signal simulators to respond to the working state after the next trigger timing, sets the baseband signal simulators receiving the digital waveform data to be in the working state, and sets the baseband signal simulators not receiving the digital waveform data to be in the standby state; after receiving the timing trigger signal, the baseband signal simulator controls the generation of a baseband signal according to the working state control code received in the last certain time interval; after the baseband signal simulator 1 is switched to a working state, playing signals in a memory section in a sectional combination mode to generate baseband signals; in the same timing interval, the baseband signal simulator 2 can not generate baseband signals and is switched to a standby state, so that digital waveform data downloaded from the main control computer is received; in the next timing interval, the baseband signal simulator 2 starts to work, and the baseband signal simulator 1 shifts to a standby state, and the two work repeatedly and alternately in the sequence; the baseband signal simulator generates continuous signals by adopting a segmented combined playing mode, and any segment of signals uses JiIn which the index i indicates the number of the signal segment, the baseband signalIs represented by J1 J2 J3 J4…JM，M>1; the two paths of baseband I/Q signals generated by the baseband signal simulator 1 and the baseband signal simulator 2 are synthesized into 1 path of I/Q signal through a combiner; in two continuous timing intervals, the baseband signal simulator 1 is supposed to work in the first timing interval, and the generated signal is recorded as J1 J2 J3 J4…JN，N>1; the baseband signal simulator 2 works in the second timing interval, and the generated signal is marked as JN+1JN+2JN+3JN+4…J2N。
2. A method for creating an infinite long-wave-shape randomly-variable signal comprises the steps that a main control computer generates a digital signal with a random waveform, the digital signal is alternately downloaded into two baseband signal simulators, the baseband signal simulators generate baseband analog signals under timing triggering, the two baseband analog signals are combined into one path of orthogonal baseband analog signal through two combiners and input into a vector signal modulator, the vector signal modulator provides a variable-frequency local oscillator to modulate orthogonal vector signals, and creation of a radio-frequency signal with a random variable infinite-time-length waveform is achieved; the method comprises the following steps:
1) the clock module generates a clock signal pulse train with single frequency of 1KHz, 10KHz, 100KHz, 1MHz, 10MHz or 100MHz according to specific application requirements, and provides a uniform high-precision reference clock signal for other components of the system;
2) the timing module generates a timing trigger signal pulse train according to a timing interval set by the main control computer by referring to a reference clock signal, and sends a trigger signal to the main control computer, the baseband signal simulator 1 and the baseband signal simulator 2 at the same time;
3) after receiving the timing trigger signal, the main control computer calculates the digital waveform data of the signal according to the configuration parameters or the user input parameters; resolving the digital waveform data in a segmentation mode, wherein the length of a segment does not exceed the length of a memory segment of the baseband signal simulator; after the digital waveform data is generated, the main control computer sequentially downloads the digital waveform data into the memory sections of the two baseband signal simulators according to an alternate sequence, and one memory section stores one digital waveform data section;
in any timing interval, the main control computer downloads digital waveform data to only one baseband signal simulator, and the downloaded data is guaranteed to be completed in the timing interval; after the downloading of the digital waveform data is finished, the main control computer sends working state control codes to the two baseband signal simulators, controls the baseband signal simulators to respond to the working state after the next trigger timing, sets the baseband signal simulators receiving the digital waveform data to be in the working state, and sets the baseband signal simulators not receiving the digital waveform data to be in the standby state;
4) after receiving the timing trigger signal, the baseband signal simulator controls the generation of a baseband signal according to the working state control code received in the last timing interval;
after the baseband signal simulator 1 is switched to a working state, playing signals in a memory section in a sectional combination mode to generate baseband signals;
in the same timing interval, the baseband signal simulator 2 can not generate baseband signals and is switched to a standby state, so that digital waveform data downloaded from the main control computer is received; in the next timing interval, the baseband signal simulator 2 starts to work, and the baseband signal simulator 1 shifts to a standby state, and the two work repeatedly and alternately in the sequence;
the baseband signal simulator generates continuous signals by adopting a segmented combined playing mode, and any segment of signals uses JiIt is shown that the index i indicates the number of the signal segments and the baseband signal is represented by J1 J2 J3 J4…JM，M>1; the two paths of baseband I/Q signals generated by the baseband signal simulator 1 and the baseband signal simulator 2 are synthesized into 1 path of I/Q signal through a combiner; in two continuous timing intervals, the baseband signal simulator 1 is supposed to work in the first timing interval, and the generated signal is recorded as J1、J2、J3、J4…JN，N>1; the baseband signal simulator 2 works in the second timing intervalAnd the generated signal is denoted as JN+1JN+2JN+3JN+4…J2NAfter passing through the combiner, the combiner outputs a complete baseband I/Q signal, which is recorded as J1、J2、J3、J4...J2N；
In order to ensure the continuity of the output signals of the combiner, the baseband signal simulator 1 and the baseband signal simulator 2 are required to adopt the same instrument and the same configuration, and the trigger delay of the two baseband signal simulators needs to be corrected in advance, so that the two signals can be continuously connected and generated;
5) the vector signal modulator receives a baseband signal J input by the combiner1、J2、J3、J4...J2NCarrying out vector signal modulation to realize the output of radio frequency signals, and recording the radio frequency signals as S1、S2、S3、S4...S2NWherein S isiAnd JiAnd correspondingly.
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