CN112737991B - Sequence-based multi-format signal modulation information control method - Google Patents
Sequence-based multi-format signal modulation information control method Download PDFInfo
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- CN112737991B CN112737991B CN202011469371.6A CN202011469371A CN112737991B CN 112737991 B CN112737991 B CN 112737991B CN 202011469371 A CN202011469371 A CN 202011469371A CN 112737991 B CN112737991 B CN 112737991B
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- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
Abstract
The invention provides a control method of multi-format signal modulation information based on a sequence, which belongs to the field of communication, wherein the modulation information of a signal to be modulated is stored in a sequence flow mode, then the modulation information and a DDS (direct digital synthesizer) in the sequence flow are integrated in an FPGA (field programmable gate array), and the multi-format modulation signal is generated simultaneously in a digital mode; and under the sequence stream mode, realizing infinite loop playing of the sequence stream by adopting a double-RAM alternate reading and writing mode. The invention can be widely applied to electronic reconnaissance and countermeasure and complex electromagnetic environment structures.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a control method of multi-format signal modulation information based on a sequence.
Background
With the development of modern communication technology, new changes of electronic signal characteristics and new modulation formats are developed, the technical characteristics of the novel modulation format include analog modulation, digital modulation, rapid hopping, signal simulation, user-defined signal patterns, signal pattern storage and the like, and the requirement of testing in the modern communication technology is met. In order to simultaneously simulate the waveforms of signals with various modulation formats, people often adopt a waveform-defining mode to calculate and simulate required complex modulation signals on a computer in advance, then download the complex modulation signals into a DDR memory bank through interfaces such as PCIe (peripheral component interconnect express) and play the complex modulation signals in a mode of FPGA + DAC (digital-to-analog converter). The prior art has the disadvantages that a computer is required to carry out complex synthesis and calculation, and the waveform pattern is relatively fixed and is complex to modify for application scenes with fixed modulation formats and different modulation depths.
In a complex electromagnetic environment, in order to test the signal demodulation capability of demodulation equipment, modulation signals of multiple formats need to be simulated at the same time, but a traditional signal source can only generate a single analog modulation signal or a single digital modulation signal at the same time, and cannot simulate modulation signals of multiple formats at the same time.
Disclosure of Invention
In order to solve the above problems, the present invention provides a control method for sequence-based multi-format signal modulation information, which uses a sequence point method to control the modulation information of multiple modulation format signals, and simultaneously generates multiple modulation format signals, and the modulation information can change rapidly with time.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for multi-format signal modulation information based on a sequence is characterized in that the modulation information of a signal to be modulated is stored in a sequence flow mode, then the modulation information and a DDS in the sequence flow are integrated in an FPGA, and the multi-format modulation signal is generated simultaneously in a digital mode.
Preferably, the bit width of the sequence stream is 512 bits, each bit of the sequence corresponds to different modulation information, and the modulation information of each modulation signal is changed at any time by modifying the corresponding control word of the sequence stream.
Preferably, the modulation information of the sequence stream includes, but is not limited to, DDS frequency control word, AM modulation control word, FM modulation control word, PM modulation control word, IQ modulation control word, pulse modulation control word, analog modulation waveform selection, modulation rate, modulation depth, vector modulation type, symbol rate.
Preferably, the specific process of integrating the modulation information and the DDS is as follows:
carrying out 8-time linear interpolation or 8-time sinusoidal interpolation on AM, FM and PM modulation data generated by various analog modulation according to selection, and generating 8 paths of analog modulation signals to each path of DDS respectively; the DDS receives the frequency control word of the sequence RAM, adds the frequency control word and the FM modulation control word and then multiplies the result by 8, after accumulation, intercepts the high 16 bits and adds the PM control word, converts the sum into a sine and cosine value after a lookup table, multiplies the sine and cosine value by IQ data to realize vector modulation, and multiplies the sine and cosine value by a corresponding AM value to realize AM modulation; finally, the data is combined with IQ data output by other DDSs and then is sent to the DA.
Preferably, the playing of the multi-format modulation signal adopts a double-RAM alternate reading and writing mode.
Preferably, the specific process of the double-RAM alternate read-write mode is as follows:
the user computer sends the sequence control word to the main control computer of the signal generator through the LAN or GPIB data interface, the main control computer orders the sequence and sends the sequence into the sequence RAM1, after the RAM1 finishes writing, the sequence reading control sequence starts to read data from the RAM1 and controls the modulation information of the output signal after being triggered or ordered externally; simultaneously, the main control computer writes the pulse description words into the RAM2, and temporarily stops writing after the RAM2 is full; after the sequence read-write controller finishes reading the sequence address in the sequence RAM1, the sequence read-write controller switches to the read sequence RAM2 and informs the master controller to continue writing into the sequence RAM1 by sending an interrupt.
The invention has the following beneficial technical effects:
the invention adopts a sequence flow mode, changes the modulation information of each modulation signal at any time by modifying the corresponding control word, and the modulation information modification is more convenient and faster; the modulation information in the sequence flow and the DDS are integrated, and the infinite loop playing of the sequence flow is realized by adopting a double-RAM alternate reading and writing mode, and the simultaneous quick jumping can be realized; because only a small number of waveform parameters are transmitted, the storage and transmission efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the present invention for generating 8 analog modulation signals and providing them to the DDS channels, respectively;
FIG. 2 is a schematic diagram of the present invention for implementing multi-format modulation signal playback;
FIG. 3 is a schematic diagram of the alternate reading and writing mode of dual RAMs of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
the technical scheme of the invention describes various modulation parameters such as DDS frequency control words, AM modulation control words, FM modulation control words, PM modulation control words, IQ modulation control words, pulse modulation control words and the like in a sequence flow mode. The bit width of the sequence stream is 512 bits, and the sequence stream contains rich modulation information, and the following table is the modulation information corresponding to each bit of the sequence. It can be seen that the integration of multiple modulation information in the sequence control word is the fundamental guarantee for the generation of multi-format signals. The modulation information of each modulated signal can be changed at any time by modifying the corresponding control word.
The modulation information contained in the 512-bit sequence is combined with the DDS data to generate the desired multi-format modulation signal. Therefore, as shown in fig. 1, it is necessary to generate 8 channels of analog modulation signals for each channel of DDS after performing 8 times of linear interpolation (the modulation waveform is selected to be a sawtooth wave, etc.) or 8 times of sinusoidal interpolation (8 times of zero insertion and then low pass filtering) on AM, FM, PM modulation data generated by various analog modulations according to the selection. As shown in fig. 2, the frequency control word of the DDS receiving sequence RAM is added with the FM modulation control word and then multiplied by 8, after the frequency control word is accumulated, the high 16 bits are intercepted and added with the PM control word, and after the addition and the conversion into a sine and cosine value through a lookup table, the sine and cosine value is multiplied by IQ data to realize vector modulation, and then the vector modulation is multiplied by a corresponding AM value to realize AM modulation. And finally, combining the data with IQ data output by other DDS and then sending the data to the DA to realize the playing of the multi-format modulation signal.
In order to meet the requirement of long-time signal simulation, in a sequence stream mode, the unlimited circulation playing of the sequence stream can be realized by adopting a double-RAM alternate reading and writing mode. As shown in fig. 3, firstly, the user computer sends sequence control words to the main control computer of the signal generator through data interfaces such as LAN or GPIB, the main control computer orders the sequences and sends the sequences to the sequence RAM1, after the sequence read control sequence is written in the RAM1, the sequence read control sequence starts to read data from the RAM1 after being triggered or commanded externally, and controls the modulation information of the output signal. And simultaneously, the main control computer writes the pulse description words into the RAM2, and temporarily stops writing after the RAM2 is full. After the sequence read-write controller finishes reading the sequence address in the sequence RAM1, the sequence read-write controller switches to the read sequence RAM2 and informs the master controller to continue writing into the sequence RAM1 by sending an interrupt. Through the ping-pong operation on the two sequence RAMs, the function of simulating the electromagnetic environment signal with infinite duration is realized.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (5)
1. A control method of multi-format signal modulation information based on sequence is characterized in that the modulation information of a signal to be modulated is stored in a sequence flow mode, then the modulation information and DDS in the sequence flow are integrated in an FPGA, and the multi-format modulation signal is generated simultaneously in a digital mode;
the specific process of integrating the modulation information and the DDS is as follows:
carrying out 8-time linear interpolation or 8-time sinusoidal interpolation on AM, FM and PM modulation data generated by various analog modulation according to selection, and generating 8 paths of analog modulation signals to each path of DDS respectively; the DDS receives the frequency control word of the sequence RAM, adds the frequency control word and the FM modulation control word and then multiplies the result by 8, after accumulation, intercepts the high 16 bits and adds the PM control word, converts the sum into a sine and cosine value after a lookup table, multiplies the sine and cosine value by IQ data to realize vector modulation, and multiplies the sine and cosine value by a corresponding AM value to realize AM modulation; and finally, combining the data with IQ data output by other DDSs and sending the data to the DA.
2. The method as claimed in claim 1, wherein the bit width of the sequence stream is 512 bits, each bit of the sequence stream corresponds to different modulation information, and the modulation information of each modulation signal is changed at any time by modifying the corresponding control word of the sequence stream.
3. The method of claim 2, wherein the modulation information of the sequence stream includes but is not limited to DDS frequency control word, AM modulation control word, FM modulation control word, PM modulation control word, IQ modulation control word, pulse modulation control word, analog modulation waveform selection, modulation rate, modulation depth, vector modulation type, symbol rate.
4. The method as claimed in claim 1, wherein the multi-format modulation signal is played by alternately reading and writing with dual RAMs.
5. The method for controlling multi-format signal modulation information based on sequences as claimed in claim 4, wherein the specific process of the double-RAM alternate read-write mode is as follows:
the user computer sends the sequence control word to the main control computer of the signal generator through the LAN or GPIB data interface, the main control computer orders the sequence and sends the sequence into the sequence RAM1, after the RAM1 finishes writing, the sequence reading control sequence starts to read data from the RAM1 and controls the modulation information of the output signal after being triggered or ordered externally; simultaneously, the main control computer writes the pulse description words into the RAM2, and temporarily stops writing after the RAM2 is full; after the sequence read-write controller finishes reading the sequence address in the sequence RAM1, the sequence read-write controller switches to the read sequence RAM2 and informs the master controller to continue writing into the sequence RAM1 by sending an interrupt.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6307441B1 (en) * | 1997-12-31 | 2001-10-23 | Texas Instruments Incorporated | Shape modulation transmit loop with digital frequency control and method for same |
| CN102467152A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method, device and system for realizing amplitude modulation and amplitude keying functions in signal source |
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| US7668234B2 (en) * | 2005-06-14 | 2010-02-23 | Anritsu Corp. | Test signal generating apparatus for communications equipment and test signal generating method for communications equipment |
| CN105871339B (en) * | 2015-01-20 | 2020-05-08 | 普源精电科技股份有限公司 | Flexible signal generator capable of modulating in segmented mode |
| CN106774628A (en) * | 2016-12-01 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of multichannel editing device and method |
| CN107168098B (en) * | 2017-05-12 | 2020-04-07 | 中国人民解放军海军航空工程学院 | Electronic countermeasure simulation system |
| CN110311877B (en) * | 2019-07-05 | 2022-03-01 | 北京神经元网络技术有限公司 | Multi-subband signal transmission method, device, equipment and medium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307441B1 (en) * | 1997-12-31 | 2001-10-23 | Texas Instruments Incorporated | Shape modulation transmit loop with digital frequency control and method for same |
| CN102467152A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method, device and system for realizing amplitude modulation and amplitude keying functions in signal source |
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