CN220254504U - Generating device of frequency hopping signal source - Google Patents
Generating device of frequency hopping signal source Download PDFInfo
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- CN220254504U CN220254504U CN202321938937.4U CN202321938937U CN220254504U CN 220254504 U CN220254504 U CN 220254504U CN 202321938937 U CN202321938937 U CN 202321938937U CN 220254504 U CN220254504 U CN 220254504U
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Abstract
The utility model provides a frequency hopping signal source generating device which comprises a crystal oscillator unit, a CPLD and a monitoring processing unit, wherein the crystal oscillator unit is connected with the input end of the CPLD, the CPLD is communicated with the monitoring processing unit, a global clock management module, a digital signal generation module and a frequency hopping control output module are arranged in the CPLD, the crystal oscillator unit is connected with the input end of the global clock management module, the output end of the global clock management is connected with the digital signal generation module and the frequency hopping control output module, the output end of the digital signal generation module is connected with the input end of the frequency hopping control output module, the controlled end of the frequency hopping control module is connected with the monitoring processing unit, and the monitoring processing unit is used for controlling the output of the frequency hopping control output module.
Description
Technical Field
The utility model relates to the technical field related to frequency hopping signal sources, in particular to a generating device of a frequency hopping signal source.
Background
Because the current frequency hopping receiver always needs to receive the signal issued by the satellite through the antenna for testing in the system joint test process, but the signal issued by the satellite is not always available, if the signal issued by the satellite is always used as a debugging signal source, a great amount of time is wasted in searching the signal and waiting for the signal to appear, and great inconvenience is brought to the system joint test.
Disclosure of Invention
The utility model aims to provide a frequency hopping signal source generating device, which adopts a crystal oscillator unit to provide a 60MHz clock source for a CPLD, and outputs stable digital signals to an A/D converter through a complex programmable logic device CPLD, wherein a frequency hopping control output module is added in the output process, and the frequency hopping control output module can be used for simulating frequency hopping signals, and finally outputs 70MHz analog signals through the A/D converter.
In order to solve the technical problems, the utility model adopts the following scheme:
the utility model provides a generating device of frequency hopping signal source, includes crystal oscillator unit, CPLD, control processing unit, the crystal oscillator unit is connected with the input of CPLD, CPLD communicates with control processing unit, be provided with global clock management module, digital signal generation module, frequency hopping control output module in the CPLD, the crystal oscillator unit is connected with the input of global clock management module, the output of global clock management is connected with digital signal generation module, frequency hopping control output module, the output of digital signal generation module is connected with the input of frequency hopping control output module, the controlled end of frequency hopping control output module is connected with control processing unit, control processing unit is used for controlling the output of frequency hopping control output module.
Further, the frequency hopping control output module comprises a frequency hopping switch and an output switch, the output end of the digital signal generating module is connected with the input end A of the frequency hopping switch, the monitoring processing unit is connected with the controlled end of the frequency hopping switch, the monitoring processing unit is used for controlling whether the output end of the frequency hopping switch is connected with the input end A of the frequency hopping switch,
the output end of the digital signal generating module is connected with the input end a of the output switch, the output end of the frequency hopping switch is connected with the input end b of the output switch, the monitoring processing unit is connected with the controlled end of the output switch, and the monitoring processing unit is used for controlling the output end of the output switch to be selectively connected with the input end a of the output switch or the input end b of the output switch.
Further, the digital signal generating module comprises a carrier frequency generating module, an NCO module, a spread spectrum signal generating module and a modulating module, wherein the output end of the global clock management module is connected with the input end of the carrier frequency generating module, the output end of the carrier frequency generating module is connected with the input end of the NCO module, the output end of the NCO module is connected with the input end of the modulating module, meanwhile, the output end of the spread spectrum signal generating module is connected with the input end of the modulating module, and the output end of the modulating module is connected with the input end of the frequency hopping control output module.
Further, the output end of the modulation module is connected with the input end A of the frequency hopping switch, and meanwhile, the output end of the modulation module is connected with the input end a of the output switch.
Furthermore, a serial port module is further arranged in the CPLD, the monitoring processing unit is connected with the controlled end of the frequency hopping switch through the serial port module, and meanwhile, the monitoring processing unit is connected with the controlled end of the output switch through the serial port module.
Further, the circuit further comprises an A/D converter, and the output end of the output switch is connected with the input end of the A/D converter.
The utility model has the beneficial effects that:
the utility model provides a generation device of a frequency hopping signal source, which provides a 70MHz signal source for a system by simulating a frequency hopping signal issued by a satellite, is convenient to use in the system, and is provided with a spread spectrum signal transmitter, a single carrier signal generator, a sweep frequency signal source and the like.
The frequency hopping signal source generating device further comprises a frequency hopping control output module, wherein the frequency hopping control output module comprises a frequency hopping switch and an output switch, the frequency hopping switch is capable of achieving the function of switching at a high speed at a speed of 16000 hops/s within a 20MHz bandwidth, and the output switch is capable of calibrating frequency hopping signals.
Drawings
Fig. 1 is a schematic block diagram of a generating device of a frequency hopping signal source in embodiment 1 of the present utility model.
Fig. 2 is a circuit diagram of a carrier frequency generation module in embodiment 1 of the present utility model.
FIG. 3 is a schematic circuit diagram of an NCO block of example 1 of the present utility model.
Fig. 4 is a circuit diagram of a spread spectrum signal generating module in embodiment 1 of the present utility model.
Fig. 5 is a circuit schematic diagram of a modulation module according to embodiment 1 of the present utility model.
Fig. 6 is a circuit schematic diagram of a frequency hopping control output module according to embodiment 1 of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the technical scheme of the present utility model, the following further details the present utility model with reference to the accompanying drawings and detailed description, but the embodiments of the present utility model are not limited thereto.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "configured," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model is described in detail below by reference to the attached drawings and in connection with the embodiments:
example 1
Because the current frequency hopping receiver always needs to receive the signal issued by the satellite through the antenna to test in the system joint test process, the test process is too complex and the use condition is harsh. Therefore, the utility model provides the generation device of the frequency hopping signal source, which can simulate the frequency hopping signal issued by a satellite to provide a 70MHz signal source for the system connection, is convenient to use in the system connection test, and simultaneously provides convenience in the external field system connection test.
As shown in FIG. 1, the generating device of the frequency hopping signal source comprises a crystal oscillator unit, a CPLD and a monitoring processing unit, wherein the crystal oscillator unit is connected with the input end of the CPLD, the CPLD is communicated with the monitoring processing unit, a global clock management module, a digital signal generation module and a frequency hopping control output module are arranged in the CPLD, the crystal oscillator unit is connected with the input end of the global clock management module, the output end of the global clock management is connected with the digital signal generation module and the frequency hopping control output module, the output end of the digital signal generation module is connected with the input end of the frequency hopping control output module, the controlled end of the frequency hopping control output module is connected with the monitoring processing unit, and the monitoring processing unit is used for controlling the output of the frequency hopping control output module.
Preferably, the frequency hopping control output module comprises a frequency hopping switch and an output switch, the output end of the digital signal generating module is connected with the input end A of the frequency hopping switch, the monitoring processing unit is connected with the controlled end of the frequency hopping switch, the monitoring processing unit is used for controlling whether the output end of the frequency hopping switch is connected with the input end A of the frequency hopping switch,
the output end of the digital signal generating module is connected with the input end a of the output switch, the output end of the frequency hopping switch is connected with the input end b of the output switch, the monitoring processing unit is connected with the controlled end of the output switch, and the monitoring processing unit is used for controlling the output end of the output switch to be selectively connected with the input end a of the output switch or the input end b of the output switch.
Preferably, the digital signal generating module comprises a carrier frequency generating module, an NCO module, a spread spectrum signal generating module and a modulating module, wherein the output end of the global clock management module is connected with the input end of the carrier frequency generating module, the output end of the carrier frequency generating module is connected with the input end of the NCO module, the output end of the NCO module is connected with the input end of the modulating module, meanwhile, the output end of the spread spectrum signal generating module is connected with the input end of the modulating module, and the output end of the modulating module is connected with the input end of the frequency hopping control output module.
Preferably, the output end of the modulation module is connected with the input end A of the frequency hopping switch, and meanwhile, the output end of the modulation module is connected with the input end a of the output switch.
Preferably, a serial port module is further arranged in the CPLD, the monitoring processing unit is connected with the controlled end of the frequency hopping switch through the serial port module, and meanwhile, the monitoring processing unit is connected with the controlled end of the output switch through the serial port module.
Preferably, the circuit further comprises an A/D converter, and the output end of the output switch is connected with the input end of the A/D converter.
Specifically, the crystal oscillator unit can be a 60MHz crystal oscillator, provides 60MHz as clock frequency for the CPLD to provide clock signals for system joint test, and selects to adopt the complex programmable logic device CPLD to design frequency hopping digital signals, so that the 60MHz clock source outputs digital signals through the complex programmable logic device CPLD, and then converts the digital signals into analog signals through the a/D converter in the form of digital signals to be output.
And the CPLD communicates with the monitoring processing unit through the serial port circuit, sends information such as state indication and the like to the monitoring extension set, and simultaneously receives control parameters from the monitoring extension set.
In order to meet the requirement that an actual frequency hopping signal can hop at a speed of 16000 hops/s within a 20MHz bandwidth, a digital signal generating module and a frequency hopping control output module are arranged in the CPLD, the crystal oscillator unit is connected with the input end of the digital signal generating module, the output end of the digital signal generating module is connected with the input end of the frequency hopping control output module, the output end of the frequency hopping control output module is connected with the input end of the A/D converter, and the frequency hopping control output module is used for controlling and outputting digital signals.
Specifically, the digital signal generating module comprises a carrier frequency generating module, an NCO module, a spread spectrum signal generating module and a modulating module, wherein the crystal oscillator unit is connected with the input end of a global clock management module to receive a clock source provided by the crystal oscillator unit, the output end of the global clock management module is connected with the input ends of the carrier frequency generating module, the NCO module, the spread spectrum signal generating module and the modulating module, the global clock management module is used for managing clocks in the CPLD, the output end of the carrier frequency generating module is connected with the input end of the NCO module, the output end of the NCO module is connected with the input end of the modulating module, and meanwhile, the output end of the spread spectrum signal generating module is connected with the input end of the modulating module, and the output end of the modulating module is connected with the input end of the frequency hopping control output module.
The crystal oscillator unit generates 300MHz clock frequency after frequency multiplication through a phase-locked frequency-multiplication IP core PLL of the global clock management module, then the global clock management module inputs the 300MHz clock frequency into the carrier frequency generation module, the carrier frequency generation module can generate digital signal precision meeting the requirements of the A/D converter through the clock frequency, the minimum precision can reach 0.1Hz step by a frequency calculation formula [ ((2-the-power 32)/fclk), so that the high requirement of the system on the signal quality is met, and a circuit diagram of the carrier frequency generation module is shown in figure 2.
The NCO module adopts a lookup table method, and two orthogonal local oscillation signals are simultaneously sent out by looking up a sine table and a cosine table, and a circuit diagram of the NCO module is shown in figure 3.
The spread spectrum code sequence generated by the spread spectrum signal generating module is Gold code; gold codes are obtained by modulo-double addition of a pair of m-sequences of preferably equal period and rate. Two pairs ofThe number of m-sequence generators being identical, i.e. n 1 ＝n 2 =n. If the relative phase shifts of the two m-sequences are different, different Gold code sequences are obtained. For n-level m sequences, 2 is a total n -1 different phase, so that 2 can be obtained by die two addition n -1 Gold code sequence, the period of these code sequences being 2 n -1, a circuit diagram of the spread spectrum signal generating module is shown in fig. 4.
The modulation module modulates the spread spectrum signal to the carrier signal in a frequency mixing mode, and meanwhile, the modulation module can perform modulation and demodulation control through monitoring, and a circuit diagram of the spread spectrum signal generation module is shown in fig. 5.
The required digital signal can be generated by the above modules, but high-speed switching at 16000 hops/s within 20MHz bandwidth has not been achieved.
Therefore, the utility model also designs a frequency hopping control output module which comprises a frequency hopping switch and an output switch, wherein the frequency hopping switch is used for realizing the function of high-speed switching at the speed of 16000 hops/s in the 20MHz bandwidth, and the output switch is used for realizing the function of calibrating the frequency hopping signal.
As shown in fig. 6, the frequency hopping control output module is composed of two parts, namely a tiaopin_mod module and an lpm_mux2x32 module, wherein the tiaopin_mod module is a frequency hopping switch, and the lpm_mux2x32 module is an output switch.
the input end A of the tiaopen_mod module is connected with the output end of the modulation module and is used for receiving digital signals, clk in the tiaopen_mod module is the controlled end of the frequency hopping switch, the monitoring processing unit provides a frequency hopping control signal clk16k for the controlled end of the tiaopen_mod module through the serial port module, when clk16k is in a high level, the input end A of the frequency hopping switch is connected with the output end of the frequency hopping switch, the digital signals received from the modulation module are directly output, when clk16k is in a low level, the input end A of the frequency hopping switch is not connected with the output end of the frequency hopping switch, and output data is 0.
Therefore, the utility model provides a 70MHz signal source for the system by simulating the frequency hopping signal issued by the satellite, and can be conveniently used in the system.
In practical use, the input signal power level is limited for other receiving devices, so that the input signal needs to be calibrated before the input signal is accessed. If the frequency hopping receiver does not have a function of starting and stopping frequency hopping, the output level of the frequency hopping signal source is difficult to directly know through an instrument in the actual application process, so that the frequency hopping control output module further comprises an lpm_mux2x32 module, and the lpm_mux2x32 module is an output switch.
The input end a in the lpm_mux2x32 module is data1x [17..0], the input end b is data0x [17..0], the data1x [17..0] is connected with the output end of the modulation module, the data0x [17..0] is connected with the output end of the frequency hopping switch, the monitoring processing unit can provide a control signal back for the controlled end of the lpm_mux2x32 module through a serial circuit, when the back is in a high level, the input end a of the control output switch is connected with the output end of the output switch, the digital signal received from the modulation module is directly output, when the back is in a low level, the input end b of the control output switch is connected with the output end of the output switch, the frequency hopping signal received from the frequency hopping switch is directly output, and the power calibration of the frequency hopping signal can be completed by realizing the output frequency hopping signal or non-frequency hopping signal through the control signal.
Specifically, the output end of the output switch is connected with the input end of the A/D converter, the intermediate frequency or radio frequency signal output by the A/D converter is directly transmitted to the frequency spectrograph after passing through the module components such as the external filter or the amplifier or the attenuator, and the signal power can be calibrated, and the actually needed signal can be obtained by adjusting the module components such as the filter or the amplifier or the attenuator.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.
Claims (6)
1. The utility model provides a generating device of frequency hopping signal source, includes crystal oscillator unit, CPLD, control processing unit, the crystal oscillator unit is connected with the input of CPLD, CPLD communicates with control processing unit, its characterized in that is provided with global clock management module, digital signal generation module, frequency hopping control output module in the CPLD, the crystal oscillator unit is connected with global clock management module's input, global clock management's output is connected with digital signal generation module, frequency hopping control output module, digital signal generation module's output is connected with frequency hopping control output module's input, frequency hopping control output module's controlled end is connected with control processing unit, control processing unit is used for controlling frequency hopping control output module's output.
2. The device for generating a frequency hopping signal source according to claim 1, wherein the frequency hopping control output module comprises a frequency hopping switch and an output switch, the output end of the digital signal generating module is connected with the input end A of the frequency hopping switch, the monitoring processing unit is connected with the controlled end of the frequency hopping switch, the monitoring processing unit is used for controlling whether the output end of the frequency hopping switch is connected with the input end A of the frequency hopping switch,
the output end of the digital signal generating module is connected with the input end a of the output switch, the output end of the frequency hopping switch is connected with the input end b of the output switch, the monitoring processing unit is connected with the controlled end of the output switch, and the monitoring processing unit is used for controlling the output end of the output switch to be selectively connected with the input end a of the output switch or the input end b of the output switch.
3. The device for generating a frequency hopping signal according to claim 2, wherein the digital signal generating module comprises a carrier frequency generating module, an NCO module, a spread spectrum signal generating module, and a modulating module, the output end of the global clock management module is connected to the input end of the carrier frequency generating module, the output end of the carrier frequency generating module is connected to the input end of the NCO module, the output end of the NCO module is connected to the input end of the modulating module, and meanwhile, the output end of the spread spectrum signal generating module is connected to the input end of the modulating module, and the output end of the modulating module is connected to the input end of the frequency hopping control output module.
4. A device for generating a frequency hopping signal as claimed in claim 3, characterized in that the output of the modulation module is connected to the input a of the frequency hopping switch, while the output of the modulation module is connected to the input a of the output switch.
5. The device for generating a frequency hopping signal source according to claim 2, wherein a serial port module is further disposed in the CPLD, the monitoring processing unit is connected with the controlled end of the frequency hopping switch through the serial port module, and meanwhile, the monitoring processing unit is connected with the controlled end of the output switch through the serial port module.
6. The apparatus of claim 2, further comprising an a/D converter, wherein the output of the output switch is connected to the input of the a/D converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321938937.4U CN220254504U (en) | 2023-07-21 | 2023-07-21 | Generating device of frequency hopping signal source |
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| CN202321938937.4U CN220254504U (en) | 2023-07-21 | 2023-07-21 | Generating device of frequency hopping signal source |
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