CN111638640A - BPM shortwave time service signal simulator - Google Patents
BPM shortwave time service signal simulator Download PDFInfo
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- CN111638640A CN111638640A CN202010457992.6A CN202010457992A CN111638640A CN 111638640 A CN111638640 A CN 111638640A CN 202010457992 A CN202010457992 A CN 202010457992A CN 111638640 A CN111638640 A CN 111638640A
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- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
Abstract
The invention provides a BPM short wave time service signal simulator.A simulator display control unit completes the configuration and display of configuration parameters and time information of the simulator; the time frequency reference unit completes selection and configuration of a 1PPS timing signal, current time information and a10 MHz frequency source; the time-signal calling control and generation unit completes the generation of time-signal calling digital waveform; the digital signal modulation unit completes amplitude modulation of the time call sign and the four paths of carriers; the analog signal generating unit completes generation of an analog time service signal; the time frequency reference signal output unit completes the generation of a10 MHz reference frequency and UTC and UT1 reference signals; the audio monitoring unit completes the monitoring of the time call number. The invention has reasonable design, perfect functions and simple operation, can simulate the BPM short-wave time service signals of four frequency points in real time according to the standard transmission format of the BPM short-wave time service system, and outputs the reference signals of the time call signs and the audio monitoring signals.
Description
Technical Field
The invention relates to a signal simulator, which belongs to the technical field of signal and information processing and is mainly used for providing simulated excitation signals and simulation data for development, field debugging, performance testing and calibration and regular inspection of a BPM short wave time service application terminal.
Background
The BPM short wave time service system is one of the large scientific devices in China, and maintains the synchronization with the coordinated Universal Time (UTC) by establishing a traceability relation with the national standard time (UTC-NTSC) to realize the transmission of standard frequency signals and standard time information. The BPM short wave time service signal is transmitted through one or more reflections of an ionosphere, can cover the land and offshore sea areas in China, has the irreplaceable advantages of wide coverage range, simple receiving method, low terminal development cost, persistent wartime and the like, can be used as a backup of time service application of a global satellite navigation system, and is an important support for the construction of PNT systems in China. The basic functions of the device are mainly timing and frequency correction, and meanwhile, the device can be applied to research of related subjects such as short-wave radio wave transmission, meteorology and ionosphere.
A BPM short-wave time service system in China alternately broadcasts standard time and standard frequency signals through four frequencies (2.5MHz, 5MHz, 10MHz and 15MHz) every day, the broadcast content comprises coordinated universal time UTC minute and second hour numbers, universal time UT1 minute and second hour numbers, non-modulation carrier waves and BPM call signs, wherein the BPM call signs comprise 40s Morse code call signs and 20s voice call signs, the 20s voice content is 'BPM standard time standard frequency broadcast station', and the time numbers and the Morse codes are 1kHz sine periodic waves. UTC second time is 10 periodic waves, UT1 second time is 100 periodic waves, and UTC and UT1 time are 300 periodic waves. Wherein each frequency transmission procedure is shown in table 1.
TABLE 1 BPM distribution program
The BPM time service application terminal is an important link for realizing the function of a time service system and reflecting the performance of the system, and realizes the synchronization of local time and UTC or UT1 time by receiving standard time frequency signals transmitted in four frequency points. With the increasing complexity of the electromagnetic environment and the influence of ionosphere time-varying factors, an application terminal cannot obtain a stable BPM signal in the research and development process, so that the terminal research and development process is complex, the research and development period is long, and a user is difficult to judge and measure the performance of the application terminal by receiving an actual space signal. Meanwhile, BPM (business process management) time service application terminals in China are unbalanced in development, equipment manufacturer levels are different, the application terminals are lack of testing and calibration, and some terminals are even not tested and calibrated, so that the timing error of a user terminal is large, the performance cannot be guaranteed, and great inconvenience and confusion are caused to the use of users. With the increasing application of BPM short-wave time service in the civil field and the military field, the requirements on a BPM short-wave time service signal simulator with reliable performance, complete functions and simple operation are more and more urgent in the research, development, debugging, performance evaluation and time delay calibration processes of a BPM short-wave application terminal. Therefore, the development of the BPM short-wave time service signal simulator has very important significance for the development of BPM time service systems and the research and development of high-performance application terminals in China.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a BPM short-wave time service signal simulator, which can solve the actual requirements of BPM short-wave time service application terminals in China in the processes of development, calibration, functional verification and testing of various performance indexes, and promote the development of BPM short-wave time service systems in China and the application thereof. The invention has reasonable design, perfect functions and simple operation, can simulate the BPM short-wave time service signals of four frequency points in real time according to the standard transmission format of the BPM short-wave time service system, and outputs the reference signals of the time call signs and the audio monitoring signals.
The technical scheme adopted by the invention for solving the technical problems is as follows: a BPM short wave time service signal simulator comprises a simulator display control unit, a time frequency reference unit, a time call control and generation unit, a digital signal modulation unit, an analog signal generation unit, a reference signal output unit and an audio monitoring unit.
The simulator display and control unit completes configuration and display of simulator configuration parameters and time information, wherein the configuration parameters comprise modulation depth, time delay parameters, time frequency parameters, four signal amplitude parameters and UT1-UTC time difference; the time frequency reference unit completes selection and configuration of a 1PPS timing signal, current time information and a10 MHz frequency source; the time-signal calling control and generation unit completes generation of time-signal calling digital waveforms; the digital signal modulation unit completes amplitude modulation of the time-stamp call sign and the four paths of carriers; the analog signal generating unit completes generation of an analog time service signal; the time frequency reference signal output unit completes the generation of 10MHz reference frequency and UTC and UT1 reference signals; and the audio monitoring unit completes the monitoring of the time call number.
The simulator display control unit comprises a liquid crystal display screen, a keyboard, an information receiving module, an information processing module and a display control module; the information receiving module receives external configuration information and current time information set by a keyboard, and the configuration parameters comprise modulation depth, time delay parameters, time frequency parameters, four signal amplitude parameters and UT1-UTC time difference; the information processing module processes the configuration parameters and the current time information and then sends out the configuration parameters and the current time information according to an agreed format and address, and transmits the input configuration information and the current time information to the liquid crystal display screen through the display control module for display.
The time frequency reference unit comprises a BDS timing receiver, a constant temperature crystal oscillator, a rubidium atomic clock, a clock management module, a time management module and a digital phase-locked loop; the BDS timing receiver outputs a 1PPS timing signal and time information after receiving the satellite signal; the rubidium atomic clock generates a synchronous 1PPS timing signal and a high-stability 10MHz frequency signal source after using a 1PPS signal output by the BDS timing receiver to tame a local frequency standard; the constant temperature crystal oscillator generates a10 MHz frequency signal and sends the signal to the clock management module; the clock management module selects one of a constant temperature crystal oscillator, a rubidium atomic clock or an externally input 10MHz frequency as a simulator clock reference source through frequency control parameters, and then generates and outputs an FPGA internal working clock by the 10MHz reference source through digital phase-locked loop frequency multiplication; the time management module selects a rubidium atomic clock input 1PPS timing signal or an externally input 1PPS timing signal as a current timing signal source through a time control parameter and outputs the signal; and meanwhile, the time management module selects the output time information of the BDS timing receiver or the externally input time information as the source of the current time information through the time control parameters and outputs the current time information.
The time-number calling control and generation unit comprises a time information judgment module, a time-number calling control module, a time-number calling selection module and a time-number calling storage module; the time information judging module judges the content to be modulated at the current 1PPS second starting moment through the time information, generates corresponding UTC sub-mark, UTC second mark, UT1 sub-mark, UT1 second mark, Morse code call sign and voice call sign signal, and informs the time call sign control module of the modulation content required to be output; the time-number call control module calculates and generates a time-number call ROM table reading address by the mark signal and combining the time delay parameter and the UT1-UTC time difference; and the time-number call-number output selection module reads the time-number/call-number digital signals from the time-number call-number storage module according to the time-number call-number marks and the corresponding ROM addresses and outputs the time-number/call-number digital signals.
The digital signal modulation unit comprises a carrier generation module and an AM amplitude modulation module; the carrier generation module continuously generates four frequency point digital sinusoidal signals of 2.5MHz, 5MHz, 10MHz and 15 MHz; and the AM amplitude modulation module modulates the time signal calling digital signal and the four frequency point digital sinusoidal signals respectively in an amplitude modulation mode according to the set amplitude modulation depth to generate the four frequency point digital time service signals.
The analog signal generating unit comprises a digital-to-analog conversion module, an amplitude adjusting module and a filter module; the digital-to-analog conversion module respectively converts the digital time service signals of the four frequency points into four paths of analog signals; the amplitude adjusting module adjusts the amplitude of each path of analog signal according to the input signal amplitude parameter; the filter module filters the four paths of analog signals after amplitude modulation through corresponding band-pass filters to generate four paths of BPM short wave time service analog signals, the four paths of BPM short wave time service analog signals are output through a BNC interface, and a user can directly use the signals after connection.
The time frequency reference signal output unit comprises four reference signal generators of UTC-1PPS, UTC-1PPM, UT1-1PPS and UT1-1PPM and a reference frequency generator; the four reference signal generators respectively generate 1PPS and 1PPM standard time reference signals which are initially aligned with the time numbers of UTC and UT1 and have the same modulation duration through the time number marks, and the reference signals are output through a BNC interface, so that a user can directly use the reference signals to debug or test; the reference frequency generator uses the working clock to generate a standard 10MHz reference frequency with the same phase as the reference frequency, and the reference frequency is output through a BNC interface, and can be used as a frequency source by a user.
The audio monitoring unit comprises a voice digital-to-analog conversion module, a power amplification module, a voice amplitude regulation module and a loudspeaker module; the time-signal call-sign digital signal is converted into an analog voice signal through a voice digital-to-analog conversion module; the analog voice signal is amplified by the power amplification module and then sent to the voice amplitude adjustment module; the voice amplitude adjusting module adjusts the output power of the analog voice signal and outputs the analog voice signal after the analog voice signal is sent to the loudspeaker module, and a user listens to a time-call sign through the loudspeaker and monitors the signal.
The invention has the beneficial effects that:
(1) the method can simulate and generate standard BPM short-wave time service signals in real time according to the broadcast content of the BPM short-wave time service system, and a user can select any signal in four frequency points for use according to actual application;
(2) the invention provides a constant temperature crystal oscillator clock source, a rubidium atomic clock source and an external input 10MHz clock source as frequency references, and a user can select the frequency sources according to different use environments;
(3) the invention can realize the control of signal modulation depth, and a user can set and output BPM short wave time service signals with different modulation depths according to the use requirement;
(4) the invention can set the amplitude of the output time service signal, and a user can set the amplitude of the output signal to test and calibrate the sensitivity of the BPM time service application terminal;
(5) the amplitude modulation mode is realized in a digital mode, so that hardware resources are saved, and broadcast delay compensation and control are conveniently realized;
(6) the invention has the function of voice output, and the user can monitor the state of the output signal in real time.
(7) The invention outputs standard 10MHz reference frequency, UTC and UT1 time reference signals. The 10MHz reference frequency can provide a synchronous reference clock source for debugging and testing of a user in real time, and is beneficial to the accuracy of debugging and calibration of an application terminal. Meanwhile, the UTC and UT1 time reference signals can be used by a user in the debugging process, and the user can conveniently test and verify the application terminal.
Drawings
FIG. 1 is a block diagram of a simulator system of the present invention;
FIG. 2 is a block diagram of the display control unit of the simulator according to the present invention;
FIG. 3 is a block diagram of a time frequency reference architecture of the present invention;
FIG. 4 is a block diagram of the time call control and generation unit of the present invention;
FIG. 5 is a block diagram of the digital modulation unit structure of the present invention;
FIG. 6 is a block diagram of an analog signal generating unit according to the present invention;
FIG. 7 is a block diagram of a time frequency reference cell structure of the present invention;
fig. 8 is a block diagram of the audio listening unit structure of the present invention.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
The technical scheme adopted by the invention for solving the technical problems is as follows: a BPM short wave time service signal simulator comprises a simulator display control unit, a time frequency reference unit, a time call control and generation unit, a digital signal modulation unit, an analog signal generation unit, a reference signal output unit and an audio monitoring unit.
The simulator display control unit completes configuration and display of simulator configuration parameters and time information and comprises a liquid crystal display screen, a keyboard, an information receiving module, an information processing module and a display control module; the information receiving module receives external configuration information and current time information set by a keyboard, and the configuration parameters comprise modulation depth, time delay parameters, time frequency parameters (time control parameters and frequency control parameters), four signal amplitude parameters and UT1-UTC time difference; the information processing module processes the configuration parameters and the current time information, sends the processed configuration parameters and the current time information to other units according to an agreed format and address, and transmits the input configuration information and the current time information to the liquid crystal display screen through the display control module for display.
The time frequency reference unit completes selection and configuration of a 1PPS timing signal, current time information and a10 MHz frequency source and comprises a BDS timing receiver, a constant temperature crystal oscillator, a rubidium atomic clock, a clock management module, a time management module and a digital phase-locked loop. The BDS timing receiver (comprising an antenna) receives the satellite signal and then outputs a 1PPS timing signal and time information; the rubidium atomic clock generates a synchronous 1PPS timing signal and a high-stability 10MHz frequency signal source after using a 1PPS signal output by the BDS timing receiver to tame a local frequency standard; the constant temperature crystal oscillator generates a10 MHz frequency signal and sends the signal to the clock management module; the clock management module selects one of a constant temperature crystal oscillator, a rubidium atomic clock or an externally input 10MHz frequency as a simulator clock reference source through frequency control parameters, and then generates and outputs an FPGA internal working clock by the 10MHz reference source through digital phase-locked loop frequency multiplication; the time management module selects a rubidium atomic clock input 1PPS timing signal or an externally input 1PPS timing signal as a current timing signal source through a time control parameter and outputs the signal; and meanwhile, the time management module selects the output time information of the BDS timing receiver or the externally input time information as the source of the current time information through the time control parameters and outputs the current time information.
The time-number calling control and generation unit completes generation of time-number calling digital waveforms and comprises a time information judgment module, a time-number calling control module, a time-number calling selection module and a time-number calling storage module. The time information judging module judges the content to be modulated at the current 1PPS second starting moment through the time information, generates corresponding UTC sub-mark, UTC second mark, UT1 sub-mark, UT1 second mark, Morse code call sign and voice call sign signal, and informs the time call sign control module of the modulation content required to be output; the time-number call control module calculates and generates a time-number call ROM table reading address by the mark signal and combining the time delay parameter and the UT1-UTC time difference; and the time-number call-number output selection module reads the time-number/call-number digital signals from the time-number call-number storage module according to the time-number call-number marks and the corresponding ROM addresses and outputs the time-number/call-number digital signals.
The digital signal modulation unit completes amplitude modulation of the time-call sign and the four paths of carriers and comprises a carrier generation module and an AM amplitude modulation module. The carrier generation module continuously generates four frequency point digital sinusoidal signals of 2.5MHz, 5MHz, 10MHz and 15 MHz; and the AM amplitude modulation module modulates the time signal calling digital signal and the four frequency point digital sinusoidal signals respectively in an amplitude modulation mode according to the set amplitude modulation depth to generate the four frequency point digital time service signals.
The analog signal generating unit completes generation of an analog time service signal and comprises a digital-to-analog conversion module, an amplitude adjusting module and a filter module. The digital-to-analog conversion module respectively converts the digital time service signals of the four frequency points into four paths of analog signals; the amplitude adjusting module adjusts the amplitude of each path of analog signal according to the input signal amplitude parameter; the filter module filters the four paths of analog signals after amplitude modulation through corresponding band-pass filters to generate four paths of BPM short wave time service analog signals, the four paths of BPM short wave time service analog signals are output through a BNC interface, and a user can directly use the signals after connection.
The time frequency reference signal output unit completes generation of 10MHz reference frequency, UTC and UT1 reference signals, and comprises four reference signal generators of UTC-1PPS, UTC-1PPM, UT1-1PPS and UT1-1PPM and a reference frequency generator. The four reference signal generators respectively generate 1PPS and 1PPM standard time reference signals which are initially aligned with the time numbers of UTC and UT1 and have the same modulation duration through the time number marks, and the reference signals are output through a BNC interface, so that a user can directly use the reference signals to debug or test; the reference frequency generator uses the working clock to generate a standard 10MHz reference frequency with the same phase as the reference frequency, and the reference frequency is output through a BNC interface, and can be used as a frequency source by a user.
The audio monitoring unit completes the monitoring of the time call sign and comprises a voice digital-to-analog conversion module, a power amplification module, a voice amplitude regulation module and a loudspeaker module. The time-signal calling digital signal is converted into an analog voice signal through a voice digital-to-analog conversion module (voice chip); the analog voice signal is amplified by the power amplification module and then sent to the voice amplitude adjustment module; the voice amplitude adjusting module adjusts the output power of the analog voice signal and outputs the analog voice signal after the analog voice signal is sent to the loudspeaker module, and a user can listen to a time-call sign through the loudspeaker to monitor the signal.
Referring to fig. 1, in the embodiment of the present invention, the BPM short-wave time service signal simulator includes a simulator display control unit, a time frequency reference unit, a time call control and generation unit, a digital signal modulation unit, an analog signal generation unit, a reference signal output unit, and an audio monitoring unit. The simulator display control unit configures the working parameters of the simulator according to the keyboard input, wherein the working parameters comprise modulation depth, UT1-UTC time difference, time delay parameters, time frequency parameters, signal amplitude parameters and current time information. And the time frequency reference unit selects a frequency source and a time source according to the time frequency parameters and outputs a working clock, a 1PPS timing signal and time information. The time-signal calling control and generation unit generates a time-signal calling digital signal and a mark thereof according to the relevant parameters provided by the simulator display control unit and the time information provided by the time frequency reference unit. The digital signal modulation unit modulates the time call sign onto carriers of four frequency points according to the set modulation depth to generate four paths of digital time service signals; the analog signal generating unit converts the four paths of digital time service signals into analog signals, and outputs the analog signals after amplitude adjustment and filtering. The reference signal output unit generates UTC, UT1 minute and second reference signal outputs by using the time-signal calling sign, and generates and outputs a10 MHz reference frequency signal by using the working clock. The audio monitoring unit converts the time call signs generated by the time call sign control unit into analog signals, and the analog signals are amplified by the power amplifier and then output sound through the loudspeaker.
Referring to fig. 2, in the embodiment of the present invention, the display control unit of the simulator includes a keyboard, a liquid crystal display, an information receiving module, an information processing module, and a display control module. Wherein, the keyboard uses 4 x 4 display keyboard, which contains 10 number keys and 6 function keys for setting configuration parameters; the liquid crystal display screen adopts a 192 multiplied by 64 dot matrix display screen and mainly displays information such as configured parameters, working time, states and the like in real time; the information receiving module, the information processing conversion module and the display control module are realized by adopting ARMSTM32F427, the information receiving module and the information processing conversion module receive configuration parameters input by a keyboard and time information input by a time frequency reference unit, and the information is processed and format-converted and then is sent to other units through an appointed address; and the display control module displays the configuration parameters and the current time signal through the liquid crystal display screen.
Referring to fig. 3, in an embodiment of the present invention, the time frequency reference unit includes a BDS timing receiver, a constant temperature crystal oscillator, a rubidium atomic clock, a time management module, a clock management module, and a digital phase-locked loop. Wherein the BDS timing receiver provides the 1PPS timing signal and time information to the simulator. The rubidium atomic clock adopts PRS10 of SRS company, which utilizes a BDS timing receiver 1PPS timing signal to acclimatize and generate a high-stability 10MHz frequency and a 1PPS timing signal; the time management module selects to use an atomic clock output 1PPS signal or an external input 1PPS signal as a timing signal through inputting a time control parameter, uses BDS timing receiver time information or external input time information as current time information, and outputs the 1PPS timing signal and the time information; the constant temperature crystal oscillator adopts JKOC36A, and the output frequency is 10 MHz; the clock management module selects 10MHz of rubidium atomic clock, 10MHz of constant temperature crystal oscillator or externally input 10MHz as a reference source through inputting frequency control parameters, and generates and outputs working clocks of other modules of the FPGA through an FPGA internal digital phase-locked loop (IP core ALTPL). The FPGA uses an EP3C120 chip of Altera corporation, and is in data communication with the ARM through a data line of 32 bits and an address line of 16 bits.
Referring to fig. 4, in the embodiment of the present invention, the time-call control and generation unit includes a time information determination module, a time-call control module, a time-call selection module, and a time-call storage module, and all the modules of the unit are implemented in an FPGA. The time information judging module judges whether a time sign or a call sign is output currently according to input time information and a 1PPS timing signal, and generates a corresponding UTC time-sharing sign, a corresponding UTC second time-sharing sign, a corresponding UT1 time-sharing sign, a corresponding UT1 second time-sharing sign, a corresponding Morse code call sign and a corresponding voice call sign, wherein a high level indicates validity; the time-delay control module carries out time-delay processing on the time-delay calling sign by the time-delay parameter, and generates a ROM table address corresponding to the calling time by using the delayed time-delay sign and the UT1-UTC time difference to read and output the digital waveform of the calling time. The time-call sign storage module generates a waveform according to a standard format and stores the waveform in an IP core ROM in the FPGA.
Referring to fig. 5, in an embodiment of the present invention, the digital signal modulation unit includes a carrier generation module and an AM amplitude modulation module. All modules of the unit are realized in FPGA. The carrier generation module reads four frequency point carrier signals from an IP core ROM stored in the FPGA by using a working clock and continuously outputs the signals; the AM amplitude modulation module carries out AM amplitude modulation on the digital time call signal and the four frequency point carrier signals by utilizing the input amplitude modulation depth parameter to generate and output four paths of digital BPM time service signals.
Referring to fig. 6, in an embodiment of the present invention, the analog signal generating unit includes a digital-to-analog converting module, an amplitude adjusting module, and a filter module. The digital-to-analog conversion module is realized by using a DAC AD9755, and converts four paths of digital time service signals into analog signals; the amplitude adjusting module is realized by adopting an AD8041 operational amplifier and an HMC472 numerical control attenuator, and the amplitude of the corresponding signal is adjusted by inputting four amplitude adjusting parameters. The filter module adopts four band-pass filters to complete the filtering of four paths of signals, and outputs BPM short wave time service signals with four frequency points through a BNC interface, wherein the design bandwidths of the filters are respectively 2.5 +/-1 MHz, 5 +/-1 MHz, 10 +/-1 MHz and 15 +/-1 MHz.
Referring to fig. 7, in the embodiment of the present invention, the time frequency reference signal output unit includes a UTC-1PPS reference signal generator, a UTC-1PPM reference signal generator, a UT1-1PPS reference signal generator, a UT1-1PPM reference signal generator, and a reference frequency generator. All modules of the unit are realized in an FPGA. The reference signal generator correspondingly generates four paths of pulse reference signals with the same length as UTC and UT1 time signs by using the time sign marks, and the pulse starting edge is aligned with the time sign starting edge and is output through a BNC interface; the reference frequency generator uses an FPGA internal digital phase-locked loop (IP core ALTPLL) to generate a standard 10MHz frequency reference and outputs the reference through a BNC interface.
Referring to fig. 8, in the embodiment of the present invention, the audio monitoring unit includes a voice digital-to-analog conversion module, a power amplification module, a voice amplitude adjustment module, and a speaker module. The voice digital-to-analog conversion module adopts TLV320AIC23B voice chips of TI company to perform digital-to-analog conversion on the input digital time-signal call sign. The power amplification module adopts a TPA6211A1DGNR amplifier of Texas Instruments to amplify the analog time-call sign audio signal; the voice amplitude regulation module adopts RK27-A10K potentiometer of ALPS company to control the output power of the audio signal; the loudspeaker module adopts a 3-inch 5W 4 omega loudspeaker horn to output audio signals.
Claims (8)
1. The utility model provides a BPM shortwave time service signal simulator, includes simulator display control unit, time frequency reference unit, time sign calling number control and production unit, digital signal modulation unit, analog signal production unit, reference signal output unit and audio frequency monitoring unit, its characterized in that: the simulator display and control unit completes configuration and display of simulator configuration parameters and time information, wherein the configuration parameters comprise modulation depth, time delay parameters, time frequency parameters, four signal amplitude parameters and UT1-UTC time difference; the time frequency reference unit completes selection and configuration of a 1PPS timing signal, current time information and a10 MHz frequency source; the time-signal calling control and generation unit completes generation of time-signal calling digital waveforms; the digital signal modulation unit completes amplitude modulation of the time-stamp call sign and the four paths of carriers; the analog signal generating unit completes generation of an analog time service signal; the time frequency reference signal output unit completes the generation of 10MHz reference frequency and UTC and UT1 reference signals; and the audio monitoring unit completes the monitoring of the time call number.
2. The BPM short wave time service signal simulator of claim 1, wherein: the simulator display control unit comprises a liquid crystal display screen, a keyboard, an information receiving module, an information processing module and a display control module; the information receiving module receives external configuration information and current time information set by a keyboard, and the configuration parameters comprise modulation depth, time delay parameters, time frequency parameters, four signal amplitude parameters and UT1-UTC time difference; the information processing module processes the configuration parameters and the current time information and then sends out the configuration parameters and the current time information according to an agreed format and address, and transmits the input configuration information and the current time information to the liquid crystal display screen through the display control module for display.
3. The BPM short wave time service signal simulator of claim 1, wherein: the time frequency reference unit comprises a BDS timing receiver, a constant temperature crystal oscillator, a rubidium atomic clock, a clock management module, a time management module and a digital phase-locked loop; the BDS timing receiver outputs a 1PPS timing signal and time information after receiving the satellite signal; the rubidium atomic clock generates a synchronous 1PPS timing signal and a high-stability 10MHz frequency signal source after using a 1PPS signal output by the BDS timing receiver to tame a local frequency standard; the constant temperature crystal oscillator generates a10 MHz frequency signal and sends the signal to the clock management module; the clock management module selects one of a constant temperature crystal oscillator, a rubidium atomic clock or an externally input 10MHz frequency as a simulator clock reference source through frequency control parameters, and then generates and outputs an FPGA internal working clock by the 10MHz reference source through digital phase-locked loop frequency multiplication; the time management module selects a rubidium atomic clock input 1PPS timing signal or an externally input 1PPS timing signal as a current timing signal source through a time control parameter and outputs the signal; and meanwhile, the time management module selects the output time information of the BDS timing receiver or the externally input time information as the source of the current time information through the time control parameters and outputs the current time information.
4. The BPM short wave time service signal simulator of claim 1, wherein: the time-number calling control and generation unit comprises a time information judgment module, a time-number calling control module, a time-number calling selection module and a time-number calling storage module; the time information judging module judges the content to be modulated at the current 1PPS second starting moment through the time information, generates corresponding UTC sub-mark, UTC second mark, UT1 sub-mark, UT1 second mark, Morse code call sign and voice call sign signal, and informs the time call sign control module of the modulation content required to be output; the time-number call control module calculates and generates a time-number call ROM table reading address by the mark signal and combining the time delay parameter and the UT1-UTC time difference; and the time-number call-number output selection module reads the time-number/call-number digital signals from the time-number call-number storage module according to the time-number call-number marks and the corresponding ROM addresses and outputs the time-number/call-number digital signals.
5. The BPM short wave time service signal simulator of claim 1, wherein: the digital signal modulation unit comprises a carrier generation module and an AM amplitude modulation module; the carrier generation module continuously generates four frequency point digital sinusoidal signals of 2.5MHz, 5MHz, 10MHz and 15 MHz; and the AM amplitude modulation module modulates the time signal calling digital signal and the four frequency point digital sinusoidal signals respectively in an amplitude modulation mode according to the set amplitude modulation depth to generate the four frequency point digital time service signals.
6. The BPM short wave time service signal simulator of claim 1, wherein: the analog signal generating unit comprises a digital-to-analog conversion module, an amplitude adjusting module and a filter module; the digital-to-analog conversion module respectively converts the digital time service signals of the four frequency points into four paths of analog signals; the amplitude adjusting module adjusts the amplitude of each path of analog signal according to the input signal amplitude parameter; the filter module filters the four paths of analog signals after amplitude modulation through corresponding band-pass filters to generate four paths of BPM short wave time service analog signals, the four paths of BPM short wave time service analog signals are output through a BNC interface, and a user can directly use the signals after connection.
7. The BPM short wave time service signal simulator of claim 1, wherein: the time frequency reference signal output unit comprises four reference signal generators of UTC-1PPS, UTC-1PPM, UT1-1PPS and UT1-1PPM and a reference frequency generator; the four reference signal generators respectively generate 1PPS and 1PPM standard time reference signals which are initially aligned with the time numbers of UTC and UT1 and have the same modulation duration through the time number marks, and the reference signals are output through a BNC interface, so that a user can directly use the reference signals to debug or test; the reference frequency generator uses the working clock to generate a standard 10MHz reference frequency with the same phase as the reference frequency, and the reference frequency is output through a BNC interface, and can be used as a frequency source by a user.
8. The BPM short wave time service signal simulator of claim 1, wherein: the audio monitoring unit comprises a voice digital-to-analog conversion module, a power amplification module, a voice amplitude regulation module and a loudspeaker module; the time-signal call-sign digital signal is converted into an analog voice signal through a voice digital-to-analog conversion module; the analog voice signal is amplified by the power amplification module and then sent to the voice amplitude adjustment module; the voice amplitude adjusting module adjusts the output power of the analog voice signal and outputs the analog voice signal after the analog voice signal is sent to the loudspeaker module, and a user listens to a time-call sign through the loudspeaker and monitors the signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010457992.6A CN111638640B (en) | 2020-05-27 | 2020-05-27 | BPM shortwave time service signal simulator |
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| CN112269312A (en) * | 2020-10-21 | 2021-01-26 | 四川汉星航通科技有限公司 | Automatic alignment device for wireless time service signals |
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