CN209748554U - high-frequency short-wave frequency hopping tracking interference device - Google Patents
high-frequency short-wave frequency hopping tracking interference device Download PDFInfo
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- CN209748554U CN209748554U CN201921051476.2U CN201921051476U CN209748554U CN 209748554 U CN209748554 U CN 209748554U CN 201921051476 U CN201921051476 U CN 201921051476U CN 209748554 U CN209748554 U CN 209748554U
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Abstract
The utility model discloses a high frequency shortwave frequency hopping tracking interference device, include: the input end of the analog-to-digital converter is connected with the baseband interference signal source; the input end of the field programmable gate array is connected with the analog-to-digital converter; the digital up-converter is connected with the output end of the field programmable gate array; the field programmable gate array also comprises a subcarrier generating module. Because a digital signal processing technology is adopted, short-wave frequency hopping tracking interference signals are generated in a full-digital mode, the modulation of the signals and the generation of frequency hopping subcarrier signals are realized by programming of an FPGA (field programmable gate array), the frequency changing time is shortened to 0.1us, the frequency hopping rate of the generated frequency hopping tracking interference signals can reach 100 ten thousand hops per second, and the tracking interference on the frequency hopping signals of 10 ten thousand hops per second can be realized.
Description
Technical Field
the utility model relates to a short wave communication technology field, concretely relates to interference source device is trailed to high-speed shortwave frequency hopping.
Background
with the development of communication technology, in order to improve the anti-interference performance of communication, a frequency hopping communication scheme is generally adopted in the new generation of tactical short wave communication.
at present, an analog frequency mixing device is adopted for short-wave frequency hopping tracking interference signals, and the principle is shown in fig. 1. A baseband interference signal to be modulated (such as noise or an external input signal) is modulated to a local oscillator signal with a fixed frequency (generally 71.4MHz), and the modulation mode is Frequency Modulation (FM), so as to form an intermediate frequency signal of 71.4 MHz. Then, the intermediate frequency signal is mixed with a variable local oscillator signal (with the frequency range of 73.4 MHz-101.4 MHz), and is converted into a short wave frequency band, so that a short wave frequency hopping tracking interference signal is generated.
The control circuit receives external data through the communication interface, converts the external data into frequency control codes, controls the variable local oscillator signal generating circuit, and realizes frequency hopping and interference tracking. In the analog frequency mixing device, a variable local oscillator signal generating circuit is realized by a phase-locked loop circuit, due to the requirement of signal phase noise performance, the time constant of a loop filter cannot be too small, the frequency conversion time of a phase-locked loop is usually more than 1ms, when the signal residence time and the signal frequency conversion time are 9:1, the hop rate of a generated frequency hopping tracking interference signal is 100 hops/second at most, effective frequency hopping tracking interference can be formed only on frequency hopping communication signals below 50 hops/second, and effective frequency hopping tracking interference cannot be formed when the hop rate of the frequency hopping communication signals is more than 50 hops/second.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a high-speed short-wave frequency hopping tracking interference source device to solve the problem that the existing analog frequency mixing device cannot form effective frequency hopping tracking interference when the hopping rate of the frequency hopping communication signal is greater than 50 hops/second.
The embodiment of the utility model provides an interference unit is trailed in high frequency shortwave frequency hopping, include:
the input end of the analog-to-digital converter is connected with the baseband interference signal source;
The input end of the field programmable gate array is connected with the analog-to-digital converter;
the digital up-converter is connected with the output end of the field programmable gate array;
The field programmable gate array also comprises a subcarrier generating module.
Optionally, the method further comprises: and the baseband conditioning module is arranged between the analog-to-digital converter and the baseband interference signal source.
Optionally, the baseband conditioning module is an audio amplifier.
Optionally, the analog-to-digital converter converts the interference signal from an analog signal to a digital signal.
Optionally, the method further comprises: and the input end of the interpolation filter is connected with the output end of the analog-to-digital converter, and the output end of the interpolation filter is connected with the subcarrier generating module and used for increasing the sampling rate of the digital signal.
Optionally, the output signal sampling rate of the field programmable gate array is a maximum of 55.296 Msps.
Optionally, the operating frequency of the digital up-converter is fixed at 15 MHz.
Optionally, the system further comprises a guiding device, and the guiding device is connected with a subcarrier generating module of the field programmable gate array through a parallel interface.
Optionally, the bootstrap device is configured to acquire a frequency control code.
Optionally, the subcarrier generating module generates subcarriers of corresponding frequencies according to the frequency control code.
The utility model has the advantages that:
Because a digital signal processing technology is adopted, short-wave frequency hopping tracking interference signals are generated in a full-digital mode, the modulation of the signals and the generation of frequency hopping subcarrier signals are realized by programming of an FPGA (field programmable gate array), the frequency changing time is shortened to 0.1us, the frequency hopping rate of the generated frequency hopping tracking interference signals can reach 100 ten thousand hops per second, and the tracking interference on the frequency hopping signals of 10 ten thousand hops per second can be realized.
Drawings
The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
FIG. 1 is a block diagram of a short-wave frequency hopping tracking interference signal generation process of an analog mixing device;
Fig. 2 is a structural diagram of a first high-frequency short-wave frequency hopping tracking jamming device according to an embodiment of the present invention;
Fig. 3 is a structural diagram of a second high-frequency short-wave frequency-hopping tracking jamming device according to an embodiment of the present invention;
Fig. 4 is a block diagram of a short-wave frequency hopping tracking interference signal generation flow in an embodiment of the present invention;
Fig. 5 is a schematic diagram of the connection of the FM modulation circuit of the FPGA of the high-frequency short-wave frequency hopping tracking jamming device according to an embodiment of the present invention;
Fig. 6 is a schematic diagram of a circuit for generating frequency hopping subcarrier of FPGA of the high-frequency short-wave frequency hopping tracking jamming device according to an embodiment of the present invention;
Fig. 7 is a schematic diagram of the FPGA signal output FIFO wiring of the high-frequency short-wave frequency-hopping tracking jamming device according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a working clock generating circuit of an FPGA of a high-frequency short-wave frequency hopping tracking jamming device according to an embodiment of the present invention;
Fig. 9 is a schematic diagram of peripheral circuit wiring of an FPGA of a high-frequency short-wave frequency hopping tracking jamming device according to an embodiment of the present invention;
Fig. 10 is a schematic circuit diagram of a DUC part of a high-frequency short-wave frequency-hopping tracking jamming device 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 embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model provides a high frequency shortwave frequency hopping tracking interference device, as shown in fig. 2, including analog to digital converter 1, field programmable gate array 3 and digital up converter 4, wherein, analog to digital converter's input is connected with baseband interference signal source 2; the input end of the field programmable gate array 3 is connected with the analog-to-digital converter 1; the digital up-converter 4 is connected with the output end of the field programmable gate array 2; wherein, the field programmable gate array 3 further comprises a subcarrier generation module 31.
In this embodiment, the baseband interference signal generated by the baseband interference signal source 2 is an analog signal, which is converted into a digital signal by the analog-to-digital converter 1, and then FM-modulated by a field programmable gate array (hereinafter referred to as FPGA), the subcarrier generating module 31 generates a carrier signal with a preset frequency, the modulated digital signal is loaded on the carrier signal, and the carrier signal is sent to the digital up-converter (DUC)4 for digital-to-analog conversion, so as to obtain a required frequency hopping tracking interference signal. In the specific embodiment, the FPGA chip adopts XC6SLX100 model, and the DUC chip adopts AD9957 model.
Due to the flexibility of the FPGA, the FPGA can customize various circuits and meet the requirements of different digital circuits, and the FPGA has strong logic resources and register resources to realize high-speed operation of big data. In a specific embodiment, as shown in fig. 5 and 6, at least two circuits are customized to the FPGA: a Frequency Modulation (FM) circuit and a subcarrier generation circuit.
the frequency conversion time processed by the existing analog signal circuit is at least 1ms, while the signal frequency conversion time of the FPGA can be shortened to 0.1 mus, therefore, when the signal residence time and the signal frequency conversion time are 9:1, the hop rate of the generated frequency hopping tracking interference signal is at most 1,000,000 hops/second, and the tracking interference of the frequency hopping signal of 10 ten thousand hops/second can be realized. In addition, a short wave frequency hopping tracking interference signal is generated in a full digital mode, modulation of the signal and generation of a frequency hopping subcarrier signal are realized by programming of the FPGA, the frequency hopping tracking interference signal is directly completed in the FPGA, and the digital up-converter does not need to frequently adjust the working frequency as long as the digital up-converter works on the fixed frequency of 15 MHz.
As an optional implementation, further comprising: and the baseband conditioning module 5 is arranged between the analog-to-digital converter and the baseband interference signal source.
As an alternative embodiment, the baseband conditioning module 5 is an audio amplifier.
In this embodiment, the baseband interference signal is amplified by an audio amplifier, here amplitude amplification.
As an alternative embodiment, the analog-to-digital converter 1 converts the interference signal from an analog signal into a digital signal.
In the present embodiment, the analog-to-digital converter 1 is implemented by an AD7684 monolithic audio AD conversion circuit.
as an optional implementation, further comprising: the interpolation filter 6 has an input connected to the output of the analog-to-digital converter 1 and an output connected to the subcarrier generation block 31, and is used for increasing the sampling rate of the digital signal.
In the present embodiment, a Filter called CIC (Cascade comb Filter) is often used in the interpolation Filter. CIC filters can be used to implement decimators and interpolators, which have the advantages of simple and regular structure and small required memory. Because it does not need multiplier, and all the coefficients of the filter are 1, and the integration link is used to reduce the memory space in the intermediate process, it is often used in the occasions of high-speed sampling (the high-speed sampling makes the number of multipliers too much) and large interpolation ratio (the large interpolation ratio makes the order of FIR filter too high, and the number of coefficients to be stored too much). The CIC filter may be implemented with a DSP or a Field Programmable Gate Array (FPGA). However, the DSP has difficulty in implementing high-speed interpolation filtering, and the FPGA has the advantages of simple design, mature technology, short design period, and easy modification of filter parameters N, M, R in the VHDL language. In addition, the CIC filter has the characteristics of no need of a multiplier and more requirements on the number of registers, and is just in line with the application range of the FPGA.
as an alternative embodiment, the maximum value of the output signal sampling rate of the field programmable gate array 3 is 55.296 Msps.
in the present embodiment, the sampling rate is raised to 55.296Msps by the CIC filter.
as an alternative embodiment, the operating frequency of the digital up-converter 4 is fixed at 15 MHz.
In this embodiment, the digital up-converter only needs to operate at a fixed frequency, since the FPGA performs FM modulation and frequency hopping modulation.
as an optional implementation, the device also comprises a guiding device 7, which is connected with the subcarrier generating module 31 of the field programmable gate array 3 through a parallel interface.
As an alternative embodiment, the bootstrapping device 7 is used to obtain a frequency control code.
as an alternative embodiment, the subcarrier generating module generates subcarriers of corresponding frequencies according to the frequency control code.
In this embodiment, the guiding device is an external scout device, generates a frequency control code according to the external requirement, and sends the frequency control code to the FPGA, so that the subcarrier generating module generates a subcarrier with a corresponding frequency, thereby generating a frequency hopping carrier signal.
although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A high frequency short wave frequency hopping tracking interference device, comprising:
The input end of the analog-to-digital converter (1) is connected with the baseband interference signal source (2);
The input end of the field programmable gate array (3) is connected with the analog-to-digital converter (1);
The digital up-converter (4) is connected with the output end of the field programmable gate array (3);
wherein the field programmable gate array (3) further comprises a subcarrier generation module (31).
2. The high-frequency short-wave frequency hopping tracking jamming device of claim 1, further comprising: and the baseband conditioning module (5) is arranged between the analog-to-digital converter (1) and the baseband interference signal source (2).
3. The high frequency short wave frequency hopping tracking jamming device according to claim 2, characterized in that the baseband conditioning module (5) is an audio amplifier.
4. The high frequency short wave frequency hopping tracking jamming device according to claim 1, characterized in that the analog-to-digital converter (1) converts the jamming signal from an analog signal to a digital signal.
5. the high-frequency short-wave frequency hopping tracking jamming device of claim 4, further comprising: an interpolation filter (6) having an input connected to the output of the analog-to-digital converter (1) and an output connected to the subcarrier generation module (31) for increasing the sampling rate of the digital signal.
6. The high-frequency short-wave frequency-hopping tracking jamming device according to claim 1, characterized in that the output signal sampling rate maximum of the field programmable gate array (3) is 55.296 Msps.
7. The high frequency short wave frequency hopping tracking jamming device according to claim 6, characterized in that the operating frequency of the digital up-converter (4) is fixed at 15 MHz.
8. the high frequency short wave frequency hopping tracking jamming device according to claim 1, characterized by further comprising a steering device (7) connected to the subcarrier generation module (31) through a parallel interface.
9. A high frequency short wave frequency hopping tracking jamming device according to claim 8, characterized in that the directing apparatus (7) is configured to obtain a frequency control code.
10. The high frequency short wave frequency hopping tracking jamming device according to claim 9, characterized in that the subcarrier generating module (31) generates subcarriers of corresponding frequencies according to the frequency control code.
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| CN201921051476.2U CN209748554U (en) | 2019-07-06 | 2019-07-06 | high-frequency short-wave frequency hopping tracking interference device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111010209A (en) * | 2019-12-13 | 2020-04-14 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing real-time frequency hopping communication interference suppression |
| CN111970083A (en) * | 2020-07-08 | 2020-11-20 | 北京航天华腾科技有限公司 | Interference signal generating device and method and interference signal source equipment |
| CN111970082A (en) * | 2020-07-08 | 2020-11-20 | 北京航天华腾科技有限公司 | Interference signal generating device and interference signal source equipment |
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2019
- 2019-07-06 CN CN201921051476.2U patent/CN209748554U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111010209A (en) * | 2019-12-13 | 2020-04-14 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing real-time frequency hopping communication interference suppression |
| CN111970083A (en) * | 2020-07-08 | 2020-11-20 | 北京航天华腾科技有限公司 | Interference signal generating device and method and interference signal source equipment |
| CN111970082A (en) * | 2020-07-08 | 2020-11-20 | 北京航天华腾科技有限公司 | Interference signal generating device and interference signal source equipment |
| CN111970083B (en) * | 2020-07-08 | 2022-04-08 | 北京航天华腾科技有限公司 | Interference signal generating device and method and interference signal source equipment |
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