CN111585609A - Miniaturized zero intermediate frequency fast frequency hopping radio station - Google Patents
Miniaturized zero intermediate frequency fast frequency hopping radio station Download PDFInfo
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- CN111585609A CN111585609A CN202010219595.5A CN202010219595A CN111585609A CN 111585609 A CN111585609 A CN 111585609A CN 202010219595 A CN202010219595 A CN 202010219595A CN 111585609 A CN111585609 A CN 111585609A
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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
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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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
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7143—Arrangements for generation of hop patterns
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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
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related 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
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
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Abstract
The embodiment of the invention provides a miniaturized zero intermediate frequency fast frequency hopping radio station, which comprises: a fast frequency hopping sending end generates an initial zero intermediate frequency mixed spread spectrum digital signal; the digital-to-analog converter converts an initial zero intermediate frequency mixed spread spectrum analog signal; the first low-pass filter filters out high-frequency components in the initial zero intermediate frequency mixed spread spectrum analog signal; the first mixer acquires an initial radio frequency mixed spread spectrum analog signal and transmits the signal through a first antenna, the second antenna receives the initial radio frequency mixed spread spectrum analog signal, and the second mixer acquires an integrated zero intermediate frequency mixed spread spectrum analog signal; the second low-pass filter acquires the integrated zero intermediate frequency mixed spread spectrum analog signal after filtering; the analog-to-digital converter converts the filtered integrated zero intermediate frequency mixed spread spectrum analog signal into an integrated zero intermediate frequency mixed spread spectrum digital signal; and the fast frequency hopping receiving end acquires the integrated zero intermediate frequency mixed spread spectrum digital signal. The invention adopts a mode of combining direct sequence spread spectrum and frequency hopping, has strong anti-interference capability, and occupies small resource amount by means of a zero intermediate frequency structure.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a miniaturized zero intermediate frequency fast frequency hopping radio station.
Background
Military wireless communication is a main communication means for guaranteeing modern operational command, is also the only communication means for contacting moving objects such as airplanes, missiles, satellites and the like, and must have anti-interference measures. The fast frequency hopping communication with the anti-multipath and anti-tracking interference capability is widely applied, and the data transmission under the low signal-to-noise ratio can be realized.
The anti-interference capability of the frequency hopping system can be enhanced by improving the spread spectrum gain and the hopping speed, for example, the high-speed frequency hopping radio station of the United states CHESS adopts a direct spread spectrum mode and a frequency hopping mixed spread spectrum mode, 5000 frequencies are switched every second, and reliable remote data transmission can be provided.
For narrow-band interference at partial frequency points, when the interference-to-signal ratio is too large, the interference is difficult to directly contend by spreading gain, and proper narrow-band interference resistance is required.
In addition, in order to meet the requirements of flexible and rapid deployment and concealment in a battlefield environment, the fast frequency hopping radio station also has the characteristic of low power consumption and miniaturization, and therefore a miniaturized zero intermediate frequency fast frequency hopping radio station is urgently needed.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a miniaturized zero-if fast frequency hopping radio station.
The embodiment of the invention provides a miniaturized zero intermediate frequency fast frequency hopping radio station, which comprises: fast frequency hopping sending end, digital-to-analog converter, first low pass filter, first mixer, first antenna, second mixer, second low pass filter, analog-to-digital converter and fast frequency hopping receiving terminal, wherein:
the fast frequency hopping sending end is used for generating an initial zero intermediate frequency mixed spread spectrum digital signal combining direct sequence spread spectrum and frequency hopping spread spectrum;
the digital-to-analog converter is used for converting the initial zero intermediate frequency mixed spread spectrum digital signal into an initial zero intermediate frequency mixed spread spectrum analog signal;
the first low-pass filter is used for filtering out high-frequency components in the initial zero intermediate frequency mixed spread spectrum analog signal and acquiring a filtered initial zero intermediate frequency mixed spread spectrum analog signal;
the first mixer is used for up-converting the filtered initial zero intermediate frequency mixed spread spectrum analog signal from zero intermediate frequency to radio frequency to obtain an initial radio frequency mixed spread spectrum analog signal;
the first antenna is used for transmitting the initial radio frequency mixed spread spectrum analog signal;
the second antenna is used for receiving the initial radio frequency mixed spread spectrum analog signal;
the second mixer is used for down-converting the initial radio frequency mixed spread spectrum analog signal from radio frequency to zero intermediate frequency to obtain an integrated zero intermediate frequency mixed spread spectrum analog signal;
the second low-pass filter is used for performing low-pass filtering on the integrated zero intermediate frequency mixed spread spectrum analog signal to obtain an integrated zero intermediate frequency mixed spread spectrum analog signal after filtering;
the analog-to-digital converter is used for converting the filtered integrated zero intermediate frequency mixed spread spectrum analog signal into an integrated zero intermediate frequency mixed spread spectrum digital signal;
the fast frequency hopping receiving end is used for acquiring the integrated zero intermediate frequency mixed spread spectrum digital signal, and performing coherent reception on the integrated zero intermediate frequency mixed spread spectrum digital signal to acquire binary data information.
Preferably, the fast frequency hopping transmitting end includes: the frequency offset processing module, the spread spectrum baseband generating module, the frequency hopping carrier generating module and the hybrid spread spectrum module, wherein a first end of the frequency offset processing module is connected with a first end of the spread spectrum baseband generating module, a second end of the frequency offset processing module is connected with a second end of the frequency hopping carrier generation simulation, the second end of the spread spectrum baseband generating module is connected with the first end of the hybrid spread spectrum module, and the second end of the frequency hopping carrier generating module is connected with the second end of the hybrid spread spectrum simulation;
the frequency offset processing module is used for providing symbol period expansion and contraction quantity corresponding to Doppler frequency offset for the spread spectrum baseband generation module and the frequency hopping carrier generation module, and providing frequency hopping patterns with frequency offset for the frequency hopping carrier generation module so as to generate fast frequency hopping digital signals with Doppler information;
the spread spectrum baseband generation module is used for receiving the period expansion and contraction quantity transmitted by the frequency deviation processing module, generating a baseband spread spectrum signal according to the transmission data and the spread spectrum code and transmitting the baseband spread spectrum signal to the mixed spread spectrum module;
the frequency hopping carrier generation module is used for generating a frequency hopping carrier according to the frequency hopping pattern with the frequency offset and the frequency hopping cycle with the cycle expansion and contraction transmitted by the frequency offset processing module and transmitting the frequency hopping carrier to the hybrid spread spectrum module;
the mixed spread spectrum module is used for generating an initial zero intermediate frequency mixed spread spectrum digital signal with Doppler frequency offset information according to the baseband spread spectrum signal of the spread spectrum baseband generation module and the frequency hopping carrier of the frequency hopping carrier generation module.
Preferably, the fast frequency hopping receiving end specifically includes a coarse capture module, a doppler local oscillator module, a fine search synchronization module, and a demodulation module, wherein:
the coarse acquisition module is used for detecting interference frequency points to delete, then carrying out differential coherent acquisition on the received digital signals, and sending frequency offset information with the precision of 4 times of symbol rate and code phase information with the precision of Tc/2 to the Doppler local oscillator module;
the Doppler local oscillator module is used for generating the zero intermediate frequency hopping carrier wave for debounce according to the frequency offset information and the code phase information provided by the coarse capture module, and updating the zero intermediate frequency hopping carrier wave after receiving the frequency offset information and the code phase information from the fine search synchronization module;
the fine search synchronization module is used for providing frequency offset information with the precision of 5Hz for the Doppler local oscillator module according to the zero intermediate frequency hopping carrier wave after being subjected to debounce, adjusting a debounce window of the Doppler local oscillator according to code phase information, detecting the position of frame header data, and transmitting the position to the demodulation module;
and the demodulation module is used for analyzing the data segment zero intermediate frequency signal after the fine search synchronization module detects the frame header to obtain binary data information.
Preferably, the fast frequency hopping sending end and the fast frequency hopping receiving end are implemented in an xc7k325tffg900-2L model FPGA, the same sampling rate and system clock 122.88MHz are adopted, and the quantization bit width is 16 bits.
Preferably, the digital-to-analog converter and the analog-to-digital converter are both AD 9371.
Preferably, the miniaturized zero-if fast frequency hopping radio station provided by the present invention further comprises: and the first high-speed interface and the second high-speed interface are used for high-speed data transmission between the FPGA and the AD 9371. The fast frequency hopping sending end is connected with the digital-to-analog converter through the first high-speed interface, the first high-speed interface is used for transmitting the initial zero intermediate frequency mixed spread spectrum digital signal, the analog-to-digital converter is connected with the fast frequency hopping receiving end through the second high-speed interface, and the second high-speed interface is used for transmitting the integrated zero intermediate frequency mixed spread spectrum digital signal.
Preferably, the center frequency point of the initial zero intermediate frequency mixed spread spectrum digital signal is 0Hz, 64 frequency hopping frequency points which are uniformly distributed in the range of ± 40.96MHz are used, and two frequency hopping patterns of 8 hops and 64 hops are provided.
Preferably, the initial zero-if hybrid spread spectrum signal uses a 1024-point spreading ratio, BPSK modulation, and square wave forming, the transmission data includes a frame header and a data segment, the oversampling multiple is 96, and the spreading gain is 46dB in a 64-hop hopping pattern.
Preferably, the center frequency of the initial radio frequency hybrid spread spectrum analog signal is 15.72864 GHz.
Preferably, the first high-speed interface and the second high-speed interface use a high-speed serial interface JESD 204B.
The miniaturized zero intermediate frequency fast frequency hopping radio station provided by the embodiment of the invention adopts a mode of combining direct sequence spread spectrum and frequency hopping, has strong anti-interference capability, realizes the digital logics of a sending end and a receiving end of the fast frequency hopping radio station in a V7 series FPGA by means of a zero intermediate frequency structure, occupies small resource amount, and can be compatible with various platforms and systems; the sending end can freely set frequency offset, and can self-simulate Doppler effect even in a wired test environment; high-speed transmission and receiving and transmitting of signals are completed by means of the AD9371, and the device has the characteristics of miniaturization and low power consumption; in addition, the frequency domain anti-jamming algorithm can work against 60dB of narrow-band interference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a miniaturized zero-if fast frequency hopping radio station according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a zero-if fast frequency hopping transmitter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a zero-if fast frequency hopping receiving end according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Fig. 1 is a schematic structural diagram of a miniaturized zero-if fast frequency hopping radio station according to an embodiment of the present invention, and as shown in fig. 1, the structure of the fast frequency hopping radio station includes: a fast frequency hopping transmitting end 101, a digital-to-analog converter 102, a first low pass filter 103, a first mixer 104, a first antenna 105, a second antenna 106, a second mixer 107, a second low pass filter 108, an analog-to-digital converter 109, and a fast frequency hopping receiving end 110, wherein:
the fast frequency hopping sending end 101 is configured to generate an initial zero intermediate frequency mixed spread spectrum digital signal in which direct sequence spread spectrum and frequency hopping spread spectrum are combined;
the digital-to-analog converter 102 is configured to convert the initial zero intermediate frequency mixed spread spectrum digital signal into an initial zero intermediate frequency mixed spread spectrum analog signal;
the first low-pass filter 103 is configured to filter out a high-frequency component in the initial zero intermediate frequency mixed spread spectrum analog signal, and obtain a filtered initial zero intermediate frequency mixed spread spectrum analog signal;
the first mixer 104 is configured to convert the filtered initial zero intermediate frequency mixed spread spectrum analog signal from a zero intermediate frequency to a radio frequency, and acquire an initial radio frequency mixed spread spectrum analog signal;
the first antenna 105 is configured to transmit the initial radio frequency hybrid spread spectrum analog signal;
the second antenna 106 is configured to receive the initial radio frequency hybrid spread spectrum analog signal;
the second mixer 107 is configured to convert the initial radio frequency mixed spread spectrum analog signal from a radio frequency to a zero intermediate frequency, and obtain an integrated zero intermediate frequency mixed spread spectrum analog signal;
the second low-pass filter 108 is configured to filter the integrated zero intermediate frequency mixed spread spectrum analog signal, and obtain an integrated zero intermediate frequency mixed spread spectrum analog signal after filtering;
the analog-to-digital converter 109 is configured to convert the filtered integrated zero intermediate frequency mixed spread spectrum analog signal into an integrated zero intermediate frequency mixed spread spectrum digital signal;
the fast frequency hopping receiving end 110 is configured to obtain an integrated zero intermediate frequency hybrid spread spectrum digital signal, and perform coherent reception on the integrated zero intermediate frequency hybrid spread spectrum digital signal to obtain binary data information.
In the embodiment of the invention, a fast frequency hopping sending end and a fast frequency hopping receiving end are collectively called as a digital logic part, a digital-to-analog converter, a first low-pass filter, a first frequency mixer, a first antenna, a second frequency mixer, a second low-pass filter and an analog-to-digital converter are collectively called as an analog hardware part, the digital logic part is connected with the analog hardware part and is used for providing digital signals for the analog hardware part and receiving returned signals, the digital logic part is realized in an xc7k325tffg900-2L type FPGA, the same sampling rate and system clock 122.88MHz are adopted, and the quantization bit width is 16 bits.
The fast frequency hopping sending end is used for generating a zero intermediate frequency mixed spread spectrum signal combining direct sequence spread spectrum and frequency hopping spread spectrum and transmitting the signal to the hardware simulation part.
And the fast frequency hopping receiving end performs coherent receiving and data analysis on the signals according to the received signals returned by the hardware simulation part.
The analog hardware part is connected with the digital logic part, on one hand, the analog hardware part transmits the zero intermediate frequency digital signal generated by the digital logic part at a high speed and converts the zero intermediate frequency digital signal into an analog radio frequency signal for transmission, and on the other hand, the analog hardware part converts the received radio frequency signal into a zero intermediate frequency digital signal and transmits the zero intermediate frequency digital signal to the digital logic part at a high speed.
In the analog hardware part, a zero intermediate frequency digital signal is firstly converted into an analog radio frequency signal for transmitting, a circuit of the transmitting part consists of a digital-to-analog converter, a first low-pass filter, a first frequency mixer and a first antenna, and the digital-to-analog converter and the fast frequency hopping sending end can be directly connected or connected through a high-speed interface.
And the first high-speed interface is responsible for quickly transmitting the digital signals between the digital logic part and the digital-to-analog converter.
The digital-to-analog converter is used for converting between the zero intermediate frequency fast frequency hopping digital signal and the analog signal and converting the initial zero intermediate frequency mixed spread spectrum digital signal into the initial zero intermediate frequency mixed spread spectrum analog signal.
The first low-pass filter is used for filtering out high-frequency components in the initial zero intermediate frequency mixed spread spectrum analog signal.
The first mixer is used for up-converting the filtered initial zero intermediate frequency mixed spread spectrum analog signal to radio frequency to obtain an initial radio frequency mixed spread spectrum analog signal.
The first antenna is used for transmitting the initial radio frequency mixed spread spectrum analog signal.
The second antenna is used for receiving the initial radio frequency mixed spread spectrum analog signal.
The second mixer is used for down-converting the radio-frequency signal to zero intermediate frequency, specifically converting the initial radio-frequency mixed spread spectrum analog signal from radio frequency to zero intermediate frequency, and acquiring an integrated zero intermediate frequency mixed spread spectrum analog signal.
The second low-pass filter is used for filtering the integrated zero intermediate frequency mixed spread spectrum analog signal to obtain the integrated zero intermediate frequency mixed spread spectrum analog signal after filtering.
The analog-to-digital converter is used for converting the filtered integrated zero intermediate frequency mixed spread spectrum analog signal into an integrated zero intermediate frequency mixed spread spectrum digital signal.
The analog-to-digital converter and the fast frequency hopping receiving end can be connected directly through a wire or through a high-speed interface, and in the embodiment of the invention, the second high-speed interface 112 is adopted to connect the analog-to-digital converter and the fast frequency hopping receiving end.
The fast frequency hopping receiving end is used for acquiring the integrated zero intermediate frequency mixed spread spectrum digital signal, and carrying out coherent reception on the integrated zero intermediate frequency mixed spread spectrum digital signal to acquire binary data information.
The miniaturized zero intermediate frequency fast frequency hopping radio station provided by the embodiment of the invention adopts a mode of combining direct sequence spread spectrum and frequency hopping, has strong anti-interference capability, realizes the digital logics of a sending end and a receiving end of the fast frequency hopping radio station in a V7 series FPGA by means of a zero intermediate frequency structure, occupies small resource amount, and can be compatible with various platforms and systems; the sending end can freely set frequency offset, and can self-simulate Doppler effect even in a wired test environment; high-speed transmission and receiving and transmitting of signals are completed by means of the AD9371, and the device has the characteristics of miniaturization and low power consumption; in addition, the frequency domain anti-jamming algorithm can work against 60dB of narrow-band interference.
On the basis of the foregoing embodiment, preferably, the fast frequency hopping transmitting end includes: the frequency offset processing module, the spread spectrum baseband generating module, the frequency hopping carrier generating module and the hybrid spread spectrum module, wherein a first end of the frequency offset processing module is connected with a first end of the spread spectrum baseband generating module, a second end of the frequency offset processing module is connected with a second end of the frequency hopping carrier generation simulation, the second end of the spread spectrum baseband generating module is connected with the first end of the hybrid spread spectrum module, and the second end of the frequency hopping carrier generating module is connected with the second end of the hybrid spread spectrum simulation;
the frequency offset processing module is used for providing symbol period expansion and contraction quantity corresponding to Doppler frequency offset for the spread spectrum baseband generation module and the frequency hopping carrier generation module, and providing frequency hopping patterns with frequency offset for the frequency hopping carrier generation module so as to generate fast frequency hopping digital signals with Doppler information;
the spread spectrum baseband generation module is used for receiving the period expansion and contraction quantity transmitted by the frequency deviation processing module, generating a baseband spread spectrum signal according to the transmission data and the spread spectrum code and transmitting the baseband spread spectrum signal to the mixed spread spectrum module;
the frequency hopping carrier generation module is used for generating a frequency hopping carrier according to the frequency hopping pattern with the frequency offset and the frequency hopping cycle with the cycle expansion and contraction transmitted by the frequency offset processing module and transmitting the frequency hopping carrier to the hybrid spread spectrum module;
the mixed spread spectrum module is used for generating an initial zero intermediate frequency mixed spread spectrum digital signal with Doppler frequency offset information according to the baseband spread spectrum signal of the spread spectrum baseband generation module and the frequency hopping carrier of the frequency hopping carrier generation module.
On the basis of the above embodiment, it is preferable to further include: the fast frequency hopping transmitter is connected with the digital-to-analog converter through the first high-speed interface, the first high-speed interface is used for transmitting the initial zero intermediate frequency mixed spread spectrum digital signal, the analog-to-digital converter is connected with the fast frequency hopping receiver through the second high-speed interface, and the second high-speed interface is used for transmitting the integrated zero intermediate frequency mixed spread spectrum digital signal.
The first high-speed interface and the second high-speed interface are used for high-speed data transmission between the FPGA and the AD 9371.
Preferably, the high-speed interface uses a high-speed serial interface JESD204B, can realize the transmission rate of 12.5Gbps at most, and does not need to align a slave clock with a link.
Preferably, the center frequency of the radio frequency signal is 15.72864 GHz.
Preferably, the analog hardware part uses an AD9371 chip to complete the transfer and conversion between the digital zero intermediate frequency signal and the analog radio frequency signal, and covers the functions of a high-speed interface, an ADC/DAC, low-pass filtering and a mixer.
Fig. 2 is a schematic structural diagram of a zero-if fast frequency hopping transmitter according to an embodiment of the present invention, and as shown in fig. 2, the fast frequency hopping transmitter includes a frequency offset processing module, a spread spectrum baseband generation module, a frequency hopping carrier generation module, and a hybrid spread spectrum module, where "frequency offset processing" indicates the frequency offset processing module, "spread spectrum baseband generation" indicates the spread spectrum baseband generation module, "frequency hopping carrier generation" indicates the frequency hopping carrier generation module, and "hybrid spread spectrum" indicates the hybrid spread spectrum module.
The frequency offset processing module provides a symbol period expansion amount corresponding to Doppler frequency offset for the spread spectrum baseband generation module and the frequency hopping carrier generation module, and provides a frequency hopping pattern with frequency offset for the frequency hopping carrier generation module so as to generate a fast frequency hopping digital signal with Doppler information.
The spread spectrum baseband generation module receives the period expansion and contraction quantity transmitted by the frequency deviation processing module, generates a baseband spread spectrum signal according to the sending data and the spread spectrum code, and transmits the baseband spread spectrum signal to the mixed spread spectrum module.
And the frequency hopping carrier generation module generates a frequency hopping carrier according to the frequency hopping pattern with the frequency offset and the frequency hopping cycle with the cycle expansion and contraction transmitted by the frequency offset processing module and transmits the frequency hopping carrier to the mixed spread spectrum module.
The mixed spread spectrum module generates a mixed spread spectrum signal with Doppler frequency offset information according to the baseband spread spectrum signal of the spread spectrum baseband generation module and the frequency hopping carrier of the frequency hopping carrier generation module, and transmits the mixed spread spectrum signal to a high-speed interface of the analog hardware part.
Preferably, the center frequency point of the zero intermediate frequency mixed spread spectrum signal is 0Hz, 64 frequency hopping frequency points which are uniformly distributed in the range of +/-40.96 MHz are used, and two frequency hopping patterns of 8-hop and 64-hop are provided.
Preferably, the zero-if hybrid spread spectrum signal uses a 1024-point spreading ratio, BPSK modulation, and square wave forming, the transmission data includes a frame header and a data segment, the oversampling multiple is 96, and the spreading gain is 46dB in the 64-hop operating mode.
Preferably, the zero-if hybrid spread spectrum signal can simulate the frequency offset and period expansion caused by the doppler effect.
Specifically, the symbol rate is 1250Ksps, and the full data 1 is used as a pilot band in the 8-hop mode for coarse acquisition, and the duration is 132 symbols; in the 64-hop mode, a frame synchronization header with a length of 64 symbols is transmitted first, and random data with unlimited length is transmitted again.
Specifically, the selected hopping pattern has no overlapping frequencies and repeats once per symbol, with a 64 hop mode hopping rate of 80000 hops per second and an 8 hop mode hopping rate of 10000 hops per second.
Specifically, the total bandwidth of the frequency hopping is 81.92MHz, and the bandwidth of each frequency point is 2.56 MHz.
Fig. 3 is a schematic structural diagram of a zero-if fast frequency hopping receiving end according to an embodiment of the present invention, where, as shown in fig. 3, a doppler local oscillator in the diagram indicates a doppler local oscillator module, and the fast frequency hopping receiving end includes a coarse capture module, a doppler local oscillator, a fine search synchronization module, and a demodulation module.
The coarse capture module is provided with a frequency domain anti-interference algorithm, firstly detects an interference frequency point for deleting, then carries out differential coherent capture on a received digital signal, and transmits frequency offset information with the precision of 4 times of symbol rate and code phase information with the precision of Tc/2 to the Doppler local oscillator.
The Doppler local oscillator firstly generates a zero intermediate frequency hopping carrier wave for debounce according to frequency offset information and code phase information provided by a coarse capture module; and after receiving the frequency offset information and the code phase information from the fine search synchronization module, regenerating a more accurate frequency hopping carrier wave.
And the fine search synchronization module provides frequency offset information with the precision of 5Hz for the Doppler local oscillator according to the zero intermediate frequency signal after the frequency offset is removed, and adjusts a frequency offset removal window of the Doppler local oscillator according to the code phase information. Meanwhile, the position of frame header data can be detected and transmitted to the demodulation module.
And after the frame header is detected by the fine search synchronization module, the demodulation module analyzes the data segment zero intermediate frequency signal after the de-hopping to obtain binary data information.
Specifically, the method comprises the steps of searching interference frequency points of a synchronous module accurately, setting a high-low threshold according to the minimum power and a threshold coefficient of an effective signal by adopting a double-threshold method, detecting interference components from a frequency hopping signal, deleting the interference components, and keeping useful components.
Specifically, in the self-transmitting and self-receiving mode, the receiving time delay tau is within (1/96) Tc (the oversampling rate is 96);
specifically, the anti-doppler range of the fast frequency hopping receiving end is ± 40kHz, and the measured capture probability is 0.99573(99573/100000) when the Es/no is 7dB, and the capture probability is 0.98106(98106/100000) when the Es/no is 6 dB.
Specifically, when the JSR is 60dB and Es/no is 7dB, the fast frequency hopping receiving end is verified to have a capture probability of 0.97653(97653/100000) through actual measurement, and the signal-to-noise ratio is within 2 dB.
In conclusion, the fast frequency hopping radio station with the low power consumption and the zero intermediate frequency structure provided by the invention adopts a mode of combining direct spreading and frequency hopping, the spread spectrum gain is 46dB, the hopping speed reaches 80000 hops per second, and the anti-interference capability is strong; the sending end can freely set frequency offset, and can simulate Doppler effect even in a wired test environment; by means of a zero intermediate frequency structure, digital logic of a sending end and a receiving end of a fast frequency hopping radio station is realized in a V7 series FPGA, so that the occupied resource amount is small, and the system is compatible with various platforms and systems; high-speed transmission and receiving and transmitting of signals are completed by means of the AD9371, and the device has the characteristics of miniaturization and low power consumption; in addition, the fast frequency hopping receiving end has a frequency domain anti-interference algorithm, and under the condition of narrow-band interference with an interference-to-signal ratio of 60dB, the signal-to-noise ratio is within 2 dB.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of 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. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a miniaturized zero intermediate frequency fast frequency hopping radio station, its characterized in that, includes fast frequency hopping sending terminal, digital-to-analog converter, first low pass filter, first mixer, first antenna, second mixer, second low pass filter, analog to digital converter and fast frequency hopping receiving terminal, wherein:
the fast frequency hopping sending end is used for generating an initial zero intermediate frequency mixed spread spectrum digital signal combining direct sequence spread spectrum and frequency hopping spread spectrum;
the digital-to-analog converter is used for converting the initial zero intermediate frequency mixed spread spectrum digital signal into an initial zero intermediate frequency mixed spread spectrum analog signal;
the first low-pass filter is used for filtering out high-frequency components in the initial zero intermediate frequency mixed spread spectrum analog signal and acquiring a filtered initial zero intermediate frequency mixed spread spectrum analog signal;
the first mixer is used for up-converting the filtered initial zero intermediate frequency mixed spread spectrum analog signal from zero intermediate frequency to radio frequency to obtain an initial radio frequency mixed spread spectrum analog signal;
the first antenna is used for transmitting the initial radio frequency mixed spread spectrum analog signal;
the second antenna is used for receiving the initial radio frequency mixed spread spectrum analog signal;
the second mixer is used for down-converting the initial radio frequency mixed spread spectrum analog signal from radio frequency to zero intermediate frequency to obtain an integrated zero intermediate frequency mixed spread spectrum analog signal;
the second low-pass filter is used for performing low-pass filtering on the integrated zero intermediate frequency mixed spread spectrum analog signal to obtain an integrated zero intermediate frequency mixed spread spectrum analog signal after filtering;
the analog-to-digital converter is used for converting the filtered integrated zero intermediate frequency mixed spread spectrum analog signal into an integrated zero intermediate frequency mixed spread spectrum digital signal;
the fast frequency hopping receiving end is used for acquiring the integrated zero intermediate frequency mixed spread spectrum digital signal, and performing coherent reception on the integrated zero intermediate frequency mixed spread spectrum digital signal to acquire binary data information.
2. The miniaturized zero-if fast frequency hopping station of claim 1, wherein the fast frequency hopping transmitter comprises: the frequency offset processing module, the spread spectrum baseband generating module, the frequency hopping carrier generating module and the hybrid spread spectrum module, wherein a first end of the frequency offset processing module is connected with a first end of the spread spectrum baseband generating module, a second end of the frequency offset processing module is connected with a second end of the frequency hopping carrier generation simulation, the second end of the spread spectrum baseband generating module is connected with the first end of the hybrid spread spectrum module, and the second end of the frequency hopping carrier generating module is connected with the second end of the hybrid spread spectrum simulation;
the frequency offset processing module is used for providing symbol period expansion and contraction quantity corresponding to Doppler frequency offset for the spread spectrum baseband generation module and the frequency hopping carrier generation module, and providing frequency hopping patterns with frequency offset for the frequency hopping carrier generation module so as to generate fast frequency hopping digital signals with Doppler information;
the spread spectrum baseband generation module is used for receiving the period expansion and contraction quantity transmitted by the frequency deviation processing module, generating a baseband spread spectrum signal according to the transmission data and the spread spectrum code and transmitting the baseband spread spectrum signal to the mixed spread spectrum module;
the frequency hopping carrier generation module is used for generating a frequency hopping carrier according to the frequency hopping pattern with the frequency offset and the frequency hopping cycle with the cycle expansion and contraction transmitted by the frequency offset processing module and transmitting the frequency hopping carrier to the hybrid spread spectrum module;
the mixed spread spectrum module is used for generating an initial zero intermediate frequency mixed spread spectrum digital signal with Doppler frequency offset information according to the baseband spread spectrum signal of the spread spectrum baseband generation module and the frequency hopping carrier of the frequency hopping carrier generation module.
3. The miniaturized zero-if fast frequency hopping radio station according to claim 1, wherein the fast frequency hopping receiving end specifically includes a coarse capture module, a doppler local oscillator module, a fine search synchronization module, and a demodulation module, wherein:
the coarse acquisition module is used for detecting interference frequency points to delete, then carrying out differential coherent acquisition on the received digital signals, and sending frequency offset information with the precision of 4 times of symbol rate and code phase information with the precision of Tc/2 to the Doppler local oscillator module;
the Doppler local oscillator module is used for generating the zero intermediate frequency hopping carrier wave for debounce according to the frequency offset information and the code phase information provided by the coarse capture module, and updating the zero intermediate frequency hopping carrier wave after receiving the frequency offset information and the code phase information from the fine search synchronization module;
the fine search synchronization module is used for providing frequency offset information with the precision of 5Hz for the Doppler local oscillator module according to the zero intermediate frequency hopping carrier wave after being subjected to debounce, adjusting a debounce window of the Doppler local oscillator according to code phase information, detecting the position of frame header data, and transmitting the position to the demodulation module;
and the demodulation module is used for analyzing the data segment zero intermediate frequency signal after the fine search synchronization module detects the frame header to obtain binary data information.
4. The miniaturized zero-if fast frequency hopping radio station according to claim 1, wherein the fast frequency hopping transmitting terminal and the fast frequency hopping receiving terminal are implemented in an xc7k325tffg900-2L model FPGA, which both uses the same sampling rate and system clock 122.88MHz, and the quantization bit width is 16 bits.
5. The miniaturized zero-if fast frequency hopping radio station of claim 1, further comprising: the fast frequency hopping transmitter is connected with the digital-to-analog converter through the first high-speed interface, the first high-speed interface is used for transmitting the initial zero intermediate frequency mixed spread spectrum digital signal, the analog-to-digital converter is connected with the fast frequency hopping receiver through the second high-speed interface, and the second high-speed interface is used for transmitting the integrated zero intermediate frequency mixed spread spectrum digital signal.
6. The miniaturized zero if fast frequency hopping radio of claim 5, wherein the digital-to-analog converter and the analog-to-digital converter are both AD 9371.
7. The miniaturized zero-if fast frequency hopping station according to claim 1, wherein the center frequency point of the initial zero-if mixed spread spectrum digital signal is 0Hz, 64 frequency hopping points are used which are uniformly distributed in a range of ± 40.96MHz, and the frequency hopping patterns are 8 hops and 64 hops.
8. The miniaturized zero-if fast frequency hopping radio according to claim 1, wherein the initial zero-if hybrid spread spectrum signal uses a 1024-point spreading ratio, BPSK modulation and square wave forming, the transmission data includes a frame header and a data segment, the oversampling factor is 96, and the spreading gain is 46dB in a 64-hop frequency hopping pattern.
9. The miniaturized zero-if fast frequency hopping radio as claimed in claim 1, wherein the center frequency of the initial rf hybrid spread spectrum analog signal is 15.72864 GHz.
10. The miniaturized zero-IF fast frequency hopping radio as claimed in claim 5, wherein said first high speed interface and said second high speed interface use a high speed serial interface JESD 204B.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113472389A (en) * | 2021-06-30 | 2021-10-01 | 中航光电科技股份有限公司 | Low-delay configurable wireless rapid frequency hopping system based on FPGA |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2462618Y (en) * | 2001-01-16 | 2001-11-28 | 信息产业部电子第五十四研究所 | Extended frequency hopping signal modem |
| WO2010061542A1 (en) * | 2008-11-25 | 2010-06-03 | 日本電気株式会社 | Wireless communication apparatus, wireless communication system, wireless communication apparatus control method, and recording medium in which program has been stored |
| CN102104571A (en) * | 2009-12-16 | 2011-06-22 | 中国科学院微电子研究所 | Ultra-wideband frequency synthesizer for 6-9 GHz dual-carrier orthogonal frequency division multiplexing |
| CN201957015U (en) * | 2011-01-14 | 2011-08-31 | 苏州英诺迅科技有限公司 | Wireless fidelity (WiFi) frequency hopping remote transmission module |
| CN102355281A (en) * | 2011-06-30 | 2012-02-15 | 桂林电子科技大学 | Combinable frequency hopping wireless transmitting-receiving system and operation method thereof |
| CN103944606A (en) * | 2014-02-28 | 2014-07-23 | 电子科技大学 | Self-adaptation frequency hopping pattern generation method |
| CN109660277A (en) * | 2018-12-28 | 2019-04-19 | 北京理工大学 | A kind of hybrid spread spectrum information generation device and method |
-
2020
- 2020-03-25 CN CN202010219595.5A patent/CN111585609B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2462618Y (en) * | 2001-01-16 | 2001-11-28 | 信息产业部电子第五十四研究所 | Extended frequency hopping signal modem |
| WO2010061542A1 (en) * | 2008-11-25 | 2010-06-03 | 日本電気株式会社 | Wireless communication apparatus, wireless communication system, wireless communication apparatus control method, and recording medium in which program has been stored |
| CN102104571A (en) * | 2009-12-16 | 2011-06-22 | 中国科学院微电子研究所 | Ultra-wideband frequency synthesizer for 6-9 GHz dual-carrier orthogonal frequency division multiplexing |
| CN201957015U (en) * | 2011-01-14 | 2011-08-31 | 苏州英诺迅科技有限公司 | Wireless fidelity (WiFi) frequency hopping remote transmission module |
| CN102355281A (en) * | 2011-06-30 | 2012-02-15 | 桂林电子科技大学 | Combinable frequency hopping wireless transmitting-receiving system and operation method thereof |
| CN103944606A (en) * | 2014-02-28 | 2014-07-23 | 电子科技大学 | Self-adaptation frequency hopping pattern generation method |
| CN109660277A (en) * | 2018-12-28 | 2019-04-19 | 北京理工大学 | A kind of hybrid spread spectrum information generation device and method |
Non-Patent Citations (2)
| Title |
|---|
| 冯辉: "超短波跳频电台硬件平台设计与实现", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 梅力: "无人机数据链快跳频同步技术研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113472389A (en) * | 2021-06-30 | 2021-10-01 | 中航光电科技股份有限公司 | Low-delay configurable wireless rapid frequency hopping system based on FPGA |
| CN113472389B (en) * | 2021-06-30 | 2022-04-01 | 中航光电科技股份有限公司 | Low-delay configurable wireless rapid frequency hopping system based on FPGA |
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