CN104300993A - BPL long wave timing frequency adjustment receiver - Google Patents
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Abstract
The invention provides a BPL long wave timing frequency adjustment receiver. An antenna unit receives BPL long wave time signals. A radio frequency signal processing unit carries out pre-filtering, amplitude amplifying, automatic gain controlling and matching on the received signals, and analog-digital conversion is carried out through an AD sampling unit. A baseband signal processing unit carries out self-adaptation trapped wave and FIR band pass filtering on the received digital signals, searches for the BPL long wave time signals, carries out heaven and earth wave recognizing and separating, carrier phase tracking, pulse period recognizing and demodulating, carries out decoding and automatic timing frequency correcting on BPL time-code data, and transmits time information, 1PPS timing signals and 10 MHz signals to a control display output unit. The BPL long wave timing frequency adjustment receiver has the advantages that digitization is achieved, the size is small, the weight is low, the function is complete, operation is easy, and expandability is achieved. Standard time information and standard frequency signals are provided for users.
Description
Technical field
The present invention relates to a kind of long-wave time service reception signal terminal, belong to electronic circuit and signal transacting field, in particular to BPL digitlization long wave standard time and frequency signal receiver, the digitlization for BPL long-wave time service signal receives and process, for user provides the temporal information of standard and the frequency signal of standard.
Background technology
BPL long wave time service system is the large-scale Terrestrial Radio time dissemination system of remote high-precision that a kind of China independently grasps, there is the advantages such as operating distance is far away, positioning precision is high, good stability, reliability are strong, its basic function is for time service and main of navigation, secondly also can be used for the scientific research such as communication and radio wave propagation, ionosphere and meteorology.BPL long wave time service system mainly utilizes the stability of the long-wave signal propagation of ground wave, propagation delay can the feature of accurately predicting, frequency signal for broadcast precise time information and standard realizes high accuracy time service function, its broadcast standard time UTC (NTSC), broadcast pulse group repetition interval (GRI) is 60ms, emission peak power is 2000KW, ground wave signals timing accuracy is better than ± 1 μ s, and ground wave signals calibrating frequency precision is better than ± and 5 × 10
-12/ sky, ground wave signals covering radius>=1000km.
BPL long wave standard time and frequency signal receiver is the final equipment realizing systemic-function, its Main Function is in timing system, receive the broadcast of BPL long wave time service system standard-frequency signal and standard time information, realize local time information and synchronous (regularly) of standard time UTC (NTSC), calibrate the frequency deviation (calibrating frequency) of local frequency signal and standard-frequency signal.Therefore, BPL long wave standard time and frequency signal receiver is widely used in timing system, for the national defence scientific research such as guided missile, space flight experiment provides standard time information and standard-frequency signal, to realize the unification of whole pilot system time and frequency.
But, the domestic full-automatic long wave standard time and frequency signal receiver of PO21 type BPL generally the used approved product that is the 1980s at present, main employing analogue technique, discrete component etc. realize reception and the process of long-wave time service signal, have volume and the large shortcoming of weight; Simultaneously, PO21 type long-wave receiver lacks time data information decoding function, first realize timing function must implement thick synchronous by means of third party's (as shortwave), then the TOC operation carrying out being correlated with realizes final timing function, and the shortcomings such as its complex operation have had a strong impact on the use of user.Therefore, develop BPL long wave standard time and frequency signal receiver that is simple to operate, cheap, perfect in shape and function and have very important meaning to the construction and development of China's long wave time service system and the application of long-wave time service.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention proposes a kind of BPL long wave standard time and frequency signal receiver, solve timing and the calibrating frequency demand of China long-wave time service user, have that digitlization, volume are little, lightweight, perfect in shape and function, simple to operate and features such as easily extensible, realize receiving and process the digitlization of BPL long-wave time service signal in BPL long wave time service system sphere of action, and then provide the temporal information (UTC) of standard and the frequency signal of standard for user.
The technical solution adopted for the present invention to solve the technical problems is: comprise antenna element, radiofrequency signal processing unit, AD sampling unit, baseband signal processing unit and control display translation unit.Described antenna element receives BPL long-wave time service signal, pre-filtering, amplitude amplification, automatic growth control and matching treatment is carried out to the received signal by radiofrequency signal processing unit, and carry out analog-to-digital conversion by AD sampling unit, the digital data transmission obtained is delivered to baseband signal processing unit by AD sampling unit, first the digital signal received is carried out adaptive notch and FIR bandpass filtering treatment by baseband signal processing unit, then code acquisition BPL long-wave time service signal in the signal after filtering process, to be captured complete after day earthwave carries out to BPL signal identification be separated and carrier phase tracking, then BPL long-wave time service signal is carried out to the identification of pulse period, find and follow the tracks of the 3rd straight to zero crossing of BPL pulse signal, then realize the demodulating and decoding of code data during BPL and autonomous timing calibrating frequency based on carrier phase information, and by temporal information, 1PPS timing signal and 10MHz Signal transmissions are delivered to and are controlled display translation unit.
Described radiofrequency signal processing unit comprises analog filter, radio frequency amplifier, automatic gain controller, analog filter completes the analog filtering process to BPL time signal, radio frequency amplifier completes and amplifies process to the amplitude of BPL time signal, and automatic gain controller completes and controls to meet the requirement of AD sampling unit to signal amplitude the amplitude of BPL time signal.
Described baseband signal processing unit comprises adaptive notch module, FIR bandpass filtering modules block, automatic search trapping module, sky-wave detection and separation module, carrier phase tracking module, Periodic identification tracking module, data demodulates decoder module, autonomous timing calibrating frequency module and time delay correcting module, adaptive notch module realizes the automatic detection to narrow-band interference signal quantity and frequency thereof, by the suppression that adaptive notch algorithm realization disturbs arrowband, then treated signal is delivered to FIR bandpass filtering modules block; FIR bandpass filtering modules block realizes the further suppression to noise and interference, then treated Signal transmissions is delivered to automatic search trapping module; Automatic search trapping module is according to the phase code feature of the group repetition interval of BPL time signal and main, realize the code acquisition to BPL long-wave time service signal by envelope extraction, envelope delay, the accumulation that is multiplied, peakvalue's checking and prize judgment Four processes, produce acquisition success id signal and deliver to sky-wave detection and separation module; Sky-wave detection and separation module realize heaven and ground wave signal identification according to feature sky-wave delay be separated, and deliver to carrier phase tracking module by being separated the ground wave signals obtained; Carrier phase tracking module samples Costas loop realizes carrier synchronization, and the carrier phase information extracting each pulse of BPL delivers to Periodic identification tracking module and data demodulates decoder module; Periodic identification tracking module sampling delay locking ring realizes the preliminary identification to the BPL time signal pulse period, then realize the straight recognition and tracking to zero crossing of BPL time signal pulse the 3rd in conjunction with carrier phase information, and produce Periodic identification and follow the tracks of success flag signal and deliver to data demodulates decoder module and autonomous timing control module; Data demodulates decoder module is according to carrier phase information, the method that sampling crosscorrelation detects realizes the demodulation to code data during BPL, every group pulse demodulation obtains the modulation intelligence of 7bit, then carry out RS error correction decoding and the decoding of CRC cyclic redundancy check (CRC) obtains the temporal information that BPL time signal carries, and temporal information delivered to autonomous timing control module and control display translation unit; Autonomous timing calibrating frequency module realizes autonomous timing controlled according to the time principle of temporal information and the broadcast of BPL long-wave time service signal and produces 1PPS timing signal and deliver to time delay correcting module, according to carrier phase information, realize the calibration to local crystal oscillator frequency by the mode of frequency synthesis, produce 10MHz frequency signal and deliver to control display translation unit; Time delay correcting module arranges GPS, when GPS is effective, by measuring the time difference between the 1PPS signal of GPS and the 1PPS signal of BPL, the 1PPS phase place of adjustment BPL realizes time delay correction, described time delay comprises propagation delay, receiver time delay and cycle time delay, when GPS is invalid, receiver coordinate according to manual keyboard input calculates the propagation delay of signal and revises, demarcate time delay according to the receiver of input and carry out receiver time delay and cycle time delay correction, then the 1PPS signal through time delay correction is delivered to and control display translation unit.
Described control display translation unit comprises constant-temperature crystal oscillator, array keyboard, LCDs, signal transacting output module and display control module; Constant-temperature crystal oscillator provides the frequency signal of 10MHz for operation of receiver; Array keyboard completes and inputs the parameter configuration of receiver, and described parameter comprises group repetition interval, receiver coordinate and receiver time delay; LCDs completes the display to temporal information and operating state; Signal transacting output module is completed the conditioning of 1PPS and 10MHz signal and is exported by BNC connector, completes the level conversion of temporal information simultaneously and is exported by serial ports; Display control module completes display to LCDs displaying contents and actions menu and control.
The invention has the beneficial effects as follows: adopt the present invention to carry out reception process to BPL long-wave time service signal, calibrating frequency and autonomous timing can be realized; The timing uncertainty that temporal information decoded bit error rate when signal to noise ratio snr >=5dB is better than 0.05%, 1PPS signal is better than 100ns.
The beneficial effect that the present invention produces is mainly manifested in the following aspects:
The first, present invention achieves the digitlization of BPL long wave standard time and frequency signal receiver, reduce receiver volume, alleviate receiver weight;
The second, present invention achieves receiver-autonomous timing, simplify the operating process that user uses long wave standard time and frequency signal receiver, improve availability and the practicality of BPL long-wave receiver;
3rd, present invention achieves the decoding and the output that wait data message of standard time UTC (NTSC), establish the basis that receiver receives satellite difference information;
4th, the present invention's design utilizes GPS 1PPS as a reference, start is carried out primary calibration and can be realized time delay corrections such as BPL signal transmission delay, receiver time delay and cycle correction, the operation simplifying user uses, improve time delay correction precision, and then improve the timing accuracy of receiver;
5th, the configurable design of sampling parameter of the present invention, the group repetition interval of No. two associated station in configuration long river can utilize No. two, long river signal to realize timing function;
6th, the present invention adopts modularized design, and increase Signal reception treatment channel and positioning calculation module can utilize No. two, long river signal to realize positioning function.
Accompanying drawing explanation
Fig. 1 is general function block architecture diagram of the present invention;
Fig. 2 is main signal process flow block diagram of the present invention;
Fig. 3 is baseband circuit structured flowchart of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described, the present invention includes but be not limited only to following embodiment.
BPL long wave standard time and frequency signal receiver, comprises antenna element, radiofrequency signal processing unit, AD sampling unit, baseband signal processing unit and control display translation unit.Antenna element is powered by feeder cable, realizes the reception to BPL long-wave time service signal, pre-filtering, amplitude amplification, automatic growth control and matching treatment, and by feeder cable, the Signal transmissions received is delivered to AD sampling unit, AD sampling unit realizes the conversion of signal from analog to numeral, and the digital data transmission after process is delivered to baseband signal processing unit, first the digital signal received is carried out adaptive notch and FIR bandpass filtering treatment by baseband signal processing unit, secondly code acquisition BPL long-wave time service signal in the signal after filtering process, to be captured complete after day earthwave carries out to BPL signal identification be separated and carrier phase tracking, then BPL long-wave time service signal is carried out to the identification of pulse period, find and follow the tracks of the 3rd straight to zero crossing of BPL pulse signal, then realize the demodulating and decoding of code data during BPL and autonomous timing calibrating frequency based on carrier phase information, and by temporal information, 1PPS timing signal and 10MHz Signal transmissions are delivered to and are controlled display translation unit, control display translation unit to achieve a butt joint the configuration of receipts machine running parameter, the control of display screen and the process of output signal and information.
Described antenna element comprises reception antenna, antenna coupler and feeder cable.Reception antenna and antenna coupler are powered by feeder cable, reception antenna is for receiving BPL time signal and Signal transmissions being delivered to antenna coupler, antenna coupler carries out pre-filtering to BPL time signal, amplitude is amplified and impedance matching, then by feeder cable, the Signal transmissions completing process is delivered to radiofrequency signal unit.
Described radiofrequency signal processing unit comprises analog filter, radio frequency amplifier, automatic gain controller.Analog filter completes the analog filtering process to BPL time signal, improves signal to noise ratio and signal interference ratio; Radio frequency amplifier completes and amplifies process to the amplitude of BPL time signal; Automatic gain controller completes and controls to meet the requirement of AD sampling unit to signal amplitude the amplitude of BPL time signal, finally the Signal transmissions completing process is delivered to AD sampling unit.
Described AD sampling unit completes sampling to BPL time signal, quantification and coding, and the BPL digital data transmission after coding is delivered to baseband signal processing unit.
Described baseband signal processing unit comprises adaptive notch module, FIR bandpass filtering modules block, automatic search trapping module, sky-wave detection and separation module, carrier phase tracking module, Periodic identification tracking module, data demodulates decoder module, autonomous timing calibrating frequency module and time delay correcting module.Adaptive notch module realizes the automatic detection to narrow-band interference signal quantity and frequency thereof, and the suppression disturbed arrowband by adaptive notch algorithm realization, then delivers to FIR bandpass filtering modules block by treated signal; FIR bandpass filtering modules block realizes the further suppression to noise and interference, then treated Signal transmissions is delivered to automatic search trapping module; Automatic search trapping module is according to the phase code feature of the group repetition interval of BPL time signal and main, realize the code acquisition to BPL long-wave time service signal by envelope extraction, envelope delay, the accumulation that is multiplied, peakvalue's checking and prize judgment Four processes, produce acquisition success id signal and deliver to sky-wave detection and separation module; Sky-wave detection and separation module realize heaven and ground wave signal identification according to feature sky-wave delay be separated, and deliver to carrier phase tracking module by being separated the ground wave signals obtained; Carrier phase tracking module samples Costas loop realizes carrier synchronization, and the carrier phase information extracting each pulse of BPL delivers to Periodic identification tracking module and data demodulates decoder module; Periodic identification tracking module sampling delay locking ring realizes the preliminary identification to the BPL time signal pulse period, then realize the straight recognition and tracking to zero crossing of BPL time signal pulse the 3rd in conjunction with carrier phase information, and produce Periodic identification and follow the tracks of success flag signal and deliver to data demodulates decoder module and autonomous timing control module; Data demodulates decoder module is according to carrier phase information, the method that sampling crosscorrelation detects realizes the demodulation to code data during BPL, every group pulse demodulation obtains the modulation intelligence of 7bit, then carry out RS error correction decoding and the decoding of CRC cyclic redundancy check (CRC) obtains the temporal information that BPL time signal carries, and temporal information delivered to autonomous timing control module and control display translation unit; Autonomous timing calibrating frequency module realizes autonomous timing controlled according to the time principle of temporal information and the broadcast of BPL long-wave time service signal and produces 1PPS timing signal and deliver to time delay correcting module, according to carrier phase information, realize the calibration to local crystal oscillator frequency by the mode of frequency synthesis, produce 10MHz frequency signal and deliver to control display translation unit; Time delay correcting module arranges GPS, when GPS is effective, by measuring the time difference between the 1PPS signal of GPS and the 1PPS signal of BPL, the 1PPS phase place of adjustment BPL realizes time delay correction, described time delay comprises propagation delay, receiver time delay and cycle time delay, when GPS is invalid, receiver coordinate according to manual keyboard input calculates the propagation delay of signal and revises, demarcate time delay according to the receiver of input and carry out receiver time delay and cycle time delay correction, then the 1PPS signal through time delay correction is delivered to and control display translation unit.
Described control display translation unit comprises constant-temperature crystal oscillator, array keyboard, LCDs, signal transacting output module and display control module.Constant-temperature crystal oscillator provides the frequency signal of 10MHz for operation of receiver; Array keyboard completes and inputs the parameter configuration of receiver, and described parameter comprises group repetition interval, receiver coordinate and receiver time delay; LCDs completes the display to temporal information and operating state; Signal transacting output module is completed the conditioning of 1PPS and 10MHz signal and is exported by BNC connector, completes the level conversion of temporal information simultaneously and is exported by serial ports; Display control module completes display to LCDs displaying contents and actions menu and control.
With reference to Fig. 1, BPL long wave standard time and frequency signal receiver functional structure of the present invention comprises antenna element, radiofrequency signal processing unit, AD sampling unit, baseband signal processing unit and control display translation unit.Wherein, antenna element comprises reception antenna, antenna coupler and feeder cable; Radiofrequency signal processing unit comprises analog filter, radio frequency amplifier and automatic gain controller; AD sampling unit comprises AD converter; Baseband signal processing unit comprises adaptive notch module, FIR bandpass filtering modules block, automatic search trapping module, sky-wave detection separation module, carrier phase tracking module, Periodic identification tracking module, data demodulates decoder module, autonomous timing calibrating frequency module and time delay correcting module; Control display translation unit and comprise constant-temperature crystal oscillator, array keyboard, LCDs, signal transacting output module and display control module.
With reference to Fig. 2, main signal handling process of the present invention comprises:
(1) BPL long-wave time service signal delivers to AD sampling unit through the reception process of antenna element and radiofrequency signal processing unit; AD sampling unit realizes the sampling of signal, quantification and coded treatment, and the digital signal completing process is delivered to baseband signal processing unit.
(2) BPL long-wave time service signal is divided into three branch roads at baseband signal processing unit after adaptive notch and FIR bandpass filtering: first branch road is used for carrying out gain controlling calculation, after gain controlling calculation completes, controlled quentity controlled variable feedback is delivered to the control of automatic growth control module realization to BPL long-wave time service signal amplitude of radiofrequency signal processing unit; Second branch road and local sinusoidal signal form Q branch road through low-pass filtering after carrying out mixing; 3rd branch road and local cosine signal form I branch road through low-pass filtering after carrying out mixing.
(3) by I, Q branch data respectively square after carry out addition process, obtain the envelope square data of BPL long-wave time service signal, be multiplied with undelayed envelope square data after envelope square data are carried out delay by SRAM, then multiplied result is accumulated by shift register and accumulator register, finally accumulation results (delay correlation peak) is delivered to DSP process, DSP, by peakvalue's checking and prize judgment, produces acquisition success id signal and delivers to FPGA.
(4) the BPL morning, the late code that are produced with this locality respectively by I branch data carry out being multiplied and accumulate, early code correlation and slow code correlation will be obtained and deliver to DSP by data/address bus, DSP is by calculating envelope control word after early code phase demodulation (EML) and peakvalue's checking judgement late, and envelope control word is given the BPL morning of envelop generator for generation of adjustment this locality of FPGA, slow code phase by data/address bus, the recognition and tracking of BPL long-wave time service pulse period can be completed in conjunction with carrier phase information simultaneously.
(5) I, Q branch data is delivered to DSP by data/address bus, DSP is by carrying out phase demodulation and loop filtering to I, Q branch road, calculate the DDS that carrier frequency control word gives FPGA, for adjusting the synchronous of local carrier frequency and BPL long-wave time service signal(-) carrier frequency; Simultaneously according to identified result, the mode adopting crosscorrelation to detect obtains BPL phase-modulated information, then by the data message of the BPL signal madulation of demodulation judgement, pattern correspondence, be shifted framing and preamble detecting four step 210bit, then given FPGA and carried out the BPL time data that RS error correction decoding and CRC cyclic redundancy check (CRC) obtain 56bit, finally carry out independently regularly producing 1PPS, then producing 10MHz in conjunction with carrier phase information by the mode of frequency synthesis according to the time principle of BPL time data and the broadcast of BPL long-wave time service signal; BPL time data is delivered to ARM by data/address bus to carry out text and resolve and obtain UTC temporal information simultaneously, then by UTC temporal information by display screen display and serial ports output.
With reference to Fig. 3, baseband circuit structure of the present invention comprises constant-temperature crystal oscillator, LCDs, array keyboard, FPGA, DSP, ARM, SRAM, FALSH, DDS.
Described constant-temperature crystal oscillator is 10MHz;
Described LCDs adopts 192 × 64;
Described array keyboard comprises the numeric keypad of 4 × 3 and the function keyboard of 2 × 3;
Described FPGA adopts the Cyclone EP3C120 chip of altera corp;
Described DSP adopts the TMS320C6713 chip of TI company;
Described ARM adopts LPC2214 chip;
Described SRAM adopts IS61LV512 chip;
Described FALSH adopts SST39VF1601 chip;
Described DDS adopts AD9854 chip.
Claims (4)
1. a BPL long wave standard time and frequency signal receiver, comprise antenna element, radiofrequency signal processing unit, AD sampling unit, baseband signal processing unit and control display translation unit, it is characterized in that: described antenna element receives BPL long-wave time service signal, pre-filtering, amplitude amplification, automatic growth control and matching treatment is carried out to the received signal by radiofrequency signal processing unit, and carry out analog-to-digital conversion by AD sampling unit, the digital data transmission obtained is delivered to baseband signal processing unit by AD sampling unit, first the digital signal received is carried out adaptive notch and FIR bandpass filtering treatment by baseband signal processing unit, then code acquisition BPL long-wave time service signal in the signal after filtering process, to be captured complete after day earthwave carries out to BPL signal identification be separated and carrier phase tracking, then BPL long-wave time service signal is carried out to the identification of pulse period, find and follow the tracks of the 3rd straight to zero crossing of BPL pulse signal, then realize the demodulating and decoding of code data during BPL and autonomous timing calibrating frequency based on carrier phase information, and by temporal information, 1PPS timing signal and 10MHz Signal transmissions are delivered to and are controlled display translation unit.
2. BPL long wave standard time and frequency signal receiver according to claim 1, it is characterized in that: described radiofrequency signal processing unit comprises analog filter, radio frequency amplifier, automatic gain controller, analog filter completes the analog filtering process to BPL time signal, radio frequency amplifier completes and amplifies process to the amplitude of BPL time signal, and automatic gain controller completes and controls to meet the requirement of AD sampling unit to signal amplitude the amplitude of BPL time signal.
3. BPL long wave standard time and frequency signal receiver according to claim 1, it is characterized in that: described baseband signal processing unit comprises adaptive notch module, FIR bandpass filtering modules block, automatic search trapping module, sky-wave detection and separation module, carrier phase tracking module, Periodic identification tracking module, data demodulates decoder module, autonomous timing calibrating frequency module and time delay correcting module, adaptive notch module realizes the automatic detection to narrow-band interference signal quantity and frequency thereof, by the suppression that adaptive notch algorithm realization disturbs arrowband, then treated signal is delivered to FIR bandpass filtering modules block, FIR bandpass filtering modules block realizes the further suppression to noise and interference, then treated Signal transmissions is delivered to automatic search trapping module, automatic search trapping module is according to the phase code feature of the group repetition interval of BPL time signal and main, realize the code acquisition to BPL long-wave time service signal by envelope extraction, envelope delay, the accumulation that is multiplied, peakvalue's checking and prize judgment Four processes, produce acquisition success id signal and deliver to sky-wave detection and separation module, sky-wave detection and separation module realize heaven and ground wave signal identification according to feature sky-wave delay be separated, and deliver to carrier phase tracking module by being separated the ground wave signals obtained, carrier phase tracking module samples Costas loop realizes carrier synchronization, and the carrier phase information extracting each pulse of BPL delivers to Periodic identification tracking module and data demodulates decoder module, Periodic identification tracking module sampling delay locking ring realizes the preliminary identification to the BPL time signal pulse period, then realize the straight recognition and tracking to zero crossing of BPL time signal pulse the 3rd in conjunction with carrier phase information, and produce Periodic identification and follow the tracks of success flag signal and deliver to data demodulates decoder module and autonomous timing control module, data demodulates decoder module is according to carrier phase information, the method that sampling crosscorrelation detects realizes the demodulation to code data during BPL, every group pulse demodulation obtains the modulation intelligence of 7bit, then carry out RS error correction decoding and the decoding of CRC cyclic redundancy check (CRC) obtains the temporal information that BPL time signal carries, and temporal information delivered to autonomous timing control module and control display translation unit, autonomous timing calibrating frequency module realizes autonomous timing controlled according to the time principle of temporal information and the broadcast of BPL long-wave time service signal and produces 1PPS timing signal and deliver to time delay correcting module, according to carrier phase information, realize the calibration to local crystal oscillator frequency by the mode of frequency synthesis, produce 10MHz frequency signal and deliver to control display translation unit, time delay correcting module arranges GPS, when GPS is effective, by measuring the time difference between the 1PPS signal of GPS and the 1PPS signal of BPL, the 1PPS phase place of adjustment BPL realizes time delay correction, described time delay comprises propagation delay, receiver time delay and cycle time delay, when GPS is invalid, receiver coordinate according to manual keyboard input calculates the propagation delay of signal and revises, demarcate time delay according to the receiver of input and carry out receiver time delay and cycle time delay correction, then the 1PPS signal through time delay correction is delivered to and control display translation unit.
4. BPL long wave standard time and frequency signal receiver according to claim 1, is characterized in that: described control display translation unit comprises constant-temperature crystal oscillator, array keyboard, LCDs, signal transacting output module and display control module; Constant-temperature crystal oscillator provides the frequency signal of 10MHz for operation of receiver; Array keyboard completes and inputs the parameter configuration of receiver, and described parameter comprises group repetition interval, receiver coordinate and receiver time delay; LCDs completes the display to temporal information and operating state; Signal transacting output module is completed the conditioning of 1PPS and 10MHz signal and is exported by BNC connector, completes the level conversion of temporal information simultaneously and is exported by serial ports; Display control module completes display to LCDs displaying contents and actions menu and control.
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| CN111474564B (en) * | 2020-04-13 | 2022-06-07 | 中国科学院国家授时中心 | Rowland-C navigation signal simulator and method |
| CN112600637A (en) * | 2020-12-03 | 2021-04-02 | 深圳思凯微电子有限公司 | Wireless broadcast time service calibration method, device and computer readable storage medium |
| CN112600637B (en) * | 2020-12-03 | 2023-12-05 | 深圳思凯微电子有限公司 | Wireless broadcast time service calibration method, device and computer readable storage medium |
| CN112994821A (en) * | 2021-02-08 | 2021-06-18 | 中国科学院国家授时中心 | Loran-C magnetic antenna received signal synthesis method based on signal characteristic detection |
| CN112994821B (en) * | 2021-02-08 | 2022-09-13 | 中国科学院国家授时中心 | Loran-C magnetic antenna received signal synthesis method based on signal characteristic detection |
| CN113411141A (en) * | 2021-06-14 | 2021-09-17 | 中国科学院国家授时中心 | ELORAN signal period identification method and device based on sky wave reconstruction |
| CN113411141B (en) * | 2021-06-14 | 2023-02-17 | 中国科学院国家授时中心 | ELORAN signal period identification method and device based on sky wave reconstruction |
| CN114706105A (en) * | 2022-06-07 | 2022-07-05 | 尚禹河北电子科技股份有限公司 | Method, device and system for capturing long-wave guide Beidou authorized signal |
| CN114706105B (en) * | 2022-06-07 | 2022-08-23 | 尚禹河北电子科技股份有限公司 | Method, device and system for capturing long-wave guide Beidou authorized signal |
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