CN116996079B - Roland emission waveform carrier phase precision regulation and control system, tuning controller and method - Google Patents
Roland emission waveform carrier phase precision regulation and control system, tuning controller and method Download PDFInfo
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- CN116996079B CN116996079B CN202310968212.8A CN202310968212A CN116996079B CN 116996079 B CN116996079 B CN 116996079B CN 202310968212 A CN202310968212 A CN 202310968212A CN 116996079 B CN116996079 B CN 116996079B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a Roland emission waveform carrier phase precision regulation and control system, a tuning controller and a method, and belongs to the technical field of electronic information and low-frequency electromagnetic emission. The invention enables the transmitting antenna tuning network to completely compensate resonance by detecting the carrier frequency, tuning the coarse inductance and the fine inductance, and accurately regulating the Roland waveform carrier frequency to the target set frequency (such as 100 kHz). The invention has less sensing quantity required by tuning, and only needs to sample the current output by the transmitter to the transmitting antenna; only by a pulse current carrier detection method, the carrier frequency of the Roland pulse changes along with the change of the reactance compensation degree of the antenna tuning network, wherein all line parasitic parameters are naturally contained, the accuracy of impedance calculation is further improved, and high tuning accuracy is guaranteed.
Description
Technical Field
The invention belongs to the technical field of electronic information and low-frequency (below 1 MHz) electromagnetic emission, and particularly relates to a Roland emission waveform carrier phase precision regulation and control system, a tuning controller and a method.
Background
The long wave (wavelength is more than 300 m) Roland navigation time service system is a ground-based remote radio navigation time service system, is widely used by countries around the world before the appearance of a space-based satellite navigation system, and is built into a plurality of large navigation station chains covering the main sea area of the world. The system transmits a Roland C pulse signal, and the signal is an international standard radio signal widely adopted by a modern long-wave radio positioning, navigation and time service system by using phase modulation pulse with the central frequency of 100kHz and an envelope line of exponential.
The rowland C radio navigation system was the mainstream remote navigation and time service system in the 80 s ago, and is very widely used. With the wide application of GPS and Beidou navigation, the attention of the Roland C system is reduced. But the roc C system is still reserved in countries such as europe and america. The related research report in the united states shows that: if the GPS satellite navigation system is used as the sole navigation means, the GPS satellite navigation system mainly depends on the space-based satellite, so that the risk that the damage is not easy to repair exists, the satellite signals transmitted to the ground are easy to be shielded and attenuated, the signal quality is poor in some complex terrains and tropical rain forest areas, the satellite signals are also easy to be interfered by hostile parties, and the risk exists in a war. The Roland C radio wave in the long wave band has the characteristics of stable transmission, small propagation loss, strong anti-interference capability and the like, and the Roland C system becomes the best supplement and enhancement for the space-based satellite navigation system, and is focused again, thus showing more and more important strategic values.
Entering the 21 st century, the new generation of enhanced Roland C navigation technology is further developed for constructing an elastic PNT system abroad. The Roland signal is used as a differential GPS correction value, the pulse time shift modulation is used for additionally modulating the Roland signal, the data communication and differential correction functions are added, the precision of the ground-based radio navigation time service can be effectively improved, and the method becomes a main development direction of a new generation of ground-based radio PNT and is recently paid attention to at home and abroad. The new generation of enhanced Roland navigation technology improves the positioning precision to within 20m, and the time service precision to the order of hundred nanoseconds, so that the performance of the ground-based Roland navigation technology is greatly improved, and the requirements of navigation, aviation and land motor operations and the time/frequency of key facilities can be effectively met.
The Roland transmitter is a core link of the Roland navigation system, and the carrier phase precision of the wave form transmitted by the transmitter, namely the control precision of the time delay of a transmitting channel, is related to the time service precision of the whole system. The new generation of enhanced Roland communication system has higher requirements on the wave carrier phase of the transmitting waveform and the time delay jitter precision of the transmitting channel of the transmitter, and the time control precision of the transmitting signal is less than 10 ns.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a Roland emission waveform carrier phase precision regulating and controlling system, a tuning controller and a method, which aim to solve the problem of how to meet the requirement of a new generation of enhanced Roland emission system on emission precision control.
In order to achieve the above object, in a first aspect, the present invention provides a method for controlling precise tuning of an inductance of a rochanter transmitting antenna tuning network, the antenna tuning network is formed by connecting a coarse tuning coil and a fine tuning coil in series, the method includes two processes of coarse tuning and fine tuning:
S1, issuing a control command to a Roland transmitter to enable the Roland transmitter to transmit a continuous wave signal with a target set frequency;
s2, a coarse tuning instruction is issued to the coarse tuning coil, so that the inductance of the coarse tuning coil is changed from a maximum value to a minimum value, a peak value of a continuous wave current signal output by a transmitter in the inductance change process is scanned, and the inductance of the coarse tuning coil corresponding to the maximum point of the output current peak value is determined and used as a regulation result of the coarse tuning coil;
s3, issuing a Roland pulse transmitting control command to the Roland transmitter to enable the transmitter to work in a Roland pulse mode, and outputting a Roland pulse signal by the transmitter;
S4, acquiring the actual measurement carrier cycle time of the output current of the fine tuning coil, comparing the actual measurement carrier cycle time with the cycle time of the target set frequency, and sending a fine tuning instruction to the fine tuning coil according to the comparison result, so that the inductance is subjected to closed-loop fine tuning until the carrier frequency of the Roland pulse output by the transmitter is the target set frequency (for example, 100 kHz).
Preferably, the criterion that the carrier frequency of the output rowland pulse of the transmitter is the target set frequency is: the monitoring window time does not exceed the theoretical window time threshold range.
Preferably, continuous window time of a plurality of continuous periods is adopted for comparison, and when the window time is larger than the upper threshold value limit of the theoretical window time, a fine adjustment instruction is sent out, so that the tuning inductance of the antenna tuning network is reduced; and when the window time is smaller than the threshold lower limit of the theoretical window time, a fine tuning instruction is sent out, and the tuning inductance of the output network is increased.
Preferably, the theoretical window time threshold range is within 10 ns.
By setting the theoretical window time threshold range and controlling the threshold range within 10ns, the carrier phase control precision is within 10ns, and the tuning precision is high.
To achieve the above object, in a second aspect, the present invention provides a precise tuning controller for a rochanter transmitting antenna tuning network inductance, comprising: a processor and a memory; the memory is used for storing computer execution instructions; the processor is configured to execute the computer-executable instructions such that the method of the first aspect is performed.
In order to achieve the above object, in a third aspect, the present invention provides a system for regulating and controlling the phase precision of a carrier wave of a rowland transmit waveform, which comprises a coarse tuning coil, a fine tuning coil, a current sampling loop, a rowland signal monitoring unit and a tuning controller according to the second aspect;
The input end of the coarse tuning coil is connected with the output end of the Roland transmitter, the output end of the coarse tuning coil is connected with the input end of the fine tuning coil, and the coarse tuning coil is used for adjusting the inductance of the coarse tuning coil according to the received instruction rotation, so that the large-range compensation of the reactance of the transmitting antenna is realized;
The output end of the fine-tuning coil is connected with the transmitting antenna and is used for adjusting the inductance of the fine-tuning coil according to the received instruction rotation so as to realize the accurate compensation of the reactance of the transmitting antenna;
The current sampling loop is used for collecting the Rogowski current signal at the output end of the fine-tuning coil, converting the Rogowski current signal into a low-level signal in an equal proportion, and feeding the low-level signal back to the Rogowski signal monitoring unit;
The Roland signal monitoring unit is used for receiving the sampling signal, and sending the carrier window time to the tuning controller after carrying out carrier identification.
Preferably, the roche signal monitoring unit comprises: an AD sampling circuit and an FPGA signal processing circuit;
The AD sampling circuit is used for performing discretization sampling on the received sampling signals and sending the discretization sampling signals to the FPGA signal processing circuit;
The FPGA signal processing circuit is used for locking the Roland waveform according to a Roland signal searching algorithm, identifying the zero crossing point of the carrier wave of the Roland signal, counting the carrier period through the counter, calculating carrier period time and carrier window time, and sending the carrier window time to the tuning control unit.
Preferably, the sampling rate of the AD sampling circuit is greater than 10 times the transmission frequency.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
The invention provides a Roland transmitting waveform carrier phase precision regulating and controlling system, a tuning controller and a method, which are used for enabling a transmitting antenna tuning network to completely compensate resonance by detecting carrier frequency and tuning coarse tuning and fine tuning inductance, and accurately regulating and controlling the carrier frequency of the Roland waveform to be a target set frequency (such as 100 kHz). The invention has less sensing quantity required by tuning, and only needs to sample the current output by the transmitter to the transmitting antenna; only by a pulse current carrier detection method, the carrier frequency of the Roland pulse changes along with the change of the reactance compensation degree of the antenna tuning network, wherein all line parasitic parameters are naturally contained, the accuracy of impedance calculation is further improved, and high tuning accuracy is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a system for regulating and controlling the phase accuracy of a carrier wave of a Roland emission waveform.
Fig. 2 is a flow chart of precise tuning control of the inductance of the tuning network of the Roland transmitting antenna provided by the invention.
Fig. 3 is a graph of excitation voltage and output current waveforms when the antenna tuning network provided by the invention is inductive.
Fig. 4 is a graph of excitation voltage and output current waveforms when the antenna tuning network provided by the present invention is capacitive.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in FIG. 1, the invention provides a Roland emission waveform carrier phase precision regulation system which mainly comprises a coarse regulation coil, a fine regulation coil, a current sampling ring, a Roland signal monitoring unit and a tuning control unit. The transmitter is connected with the coarse tuning coil and the fine tuning coil in series in sequence, the output end of the transmitter is connected with the input end of the coarse tuning coil, the output end of the coarse tuning coil is connected with the output end of the fine tuning coil, and the output end of the fine tuning coil is connected with the transmitting antenna. The transmitting antenna is equivalent to an RC impedance circuit consisting of C A and R A.
The transmitter generates a high power (in the order of kW) excitation voltage signal that acts on the antenna tuning network. A rowland current signal is excited on the transmitting antenna. The current sampling loop samples the Rogowski current signal at the output end of the fine-tuning coil and feeds the Rogowski current signal back to the Rogowski signal monitoring unit. The Roland signal monitoring unit receives the sampling signal, and after carrying out carrier identification, the carrier window time is sent to the tuning control unit. The tuning control unit sends coil rotation instructions to the coarse tuning coil and the fine tuning coil. The coarse tuning coil and the fine tuning coil rotate the coils according to the received instructions, and the compensation inductance is adjusted.
The coarse tuning inductance and the fine tuning inductance form an antenna tuning network, so that the reactance of the transmitting antenna is completely and accurately compensated. The inductor is a conventional variable tuning inductor and is generally composed of an inner layer and an outer layer of coils which can move relatively. Rotating the coil changes the amount of mutual inductance, thereby changing the inductance of the tuning coil. The tuning inductor receives a control signal of the tuning control unit, and the relative positions of the inner layer coil and the outer layer coil are rotated through the motor, so that the inductance is adjusted. In order to realize accurate tuning, two kinds of tuning inductors with precision and range are arranged to be matched with each other. The inductance value adjusting range of the coarse tuning inductor is set to be hundred uH to mH, the adjusting precision is 100uH, the inductance value adjusting range of the fine tuning coil is ten uH to several tens uH, and the adjusting precision is 10 uH. The tuning inductances with the two precision and range are matched with each other, the coarse tuning inductance realizes the large-range compensation of the reactance of the transmitting antenna, and the fine tuning inductance completes the accurate compensation of the reactance of the transmitting antenna. In one embodiment, assuming that the reactance of the transmitting antenna is 400-800 ohms and the corresponding required compensation inductance is 636 uH-1.273 mH, the inductance adjustment range of the coarse tuning inductance is set to 400 uH-1.5 mH and the inductance adjustment range of the fine tuning coil is set to 15 uH-60 uH.
The current sampling loop samples the Roland current signal on the transmitting antenna, converts the current signal into a low-level signal (for example, a voltage signal of 0-5V) in an equal proportion, and feeds the low-level signal back to the Roland monitoring unit.
The Roland monitoring unit mainly comprises a high-speed AD sampling circuit and an FPGA signal processing circuit, and is used for completing the sampling of Roland signals, the detection of current peaks and carrier zero crossing points. The high-speed AD sampling circuit samples the waveform of the transmitted Roland current signal and sends the waveform to the internal FPGA signal processing module. The FPGA signal processing circuit locks the Roland waveform according to the Roland signal searching algorithm, recognizes the zero crossing point of the carrier wave of the Roland signal, counts the carrier wave period through the counter, calculates the carrier wave period time, and sends the test period time result to the tuning control unit.
It is assumed that one sinusoidal carrier will produce 3 zero crossing times. Assuming that the i-th carrier zero crossing time is T (2*i-2), T (2*i-1), and T (2*i) in order, a single carrier period T (carrier) =t (2*i) -T (2*i-2). The window time corresponding to the N carrier periods is T (N) =t (2*i) -T (2 x (i-N)).
The tuning control unit adjusts the tuning inductance according to the detection result of the Roland monitoring unit to complete the complete compensation of the antenna reactance, so that the carrier frequency of the Roland pulse is accurately operated at 100kHz, and the accuracy of the carrier phase is ensured.
As shown in fig. 2, the tuning control process includes two adjustment processes: 1) Transmitting a continuous wave for coarse tuning; 2) The rowland pulse is transmitted for fine tuning.
First is a coarse tuning process. The tuning control unit issues a command to the transmitter to transmit a 100kHz continuous wave signal. The tuning control unit controls the coarse tuning inductance to change from a maximum value to a minimum value, scans the peak value of the continuous wave current signal, and obtains the inductance corresponding to the maximum point of the output current peak value, so that the coarse tuning inductance is regulated and controlled to the inductance.
And secondly, a fine tuning process. After the coarse tuning is finished, the tuning control unit issues a command to the transmitter to transmit the Roland pulse signal. The tuning control unit compares the measured carrier cycle time with the target set cycle time of 100kHz frequency. And carrying out fine adjustment on the inductance of the tuning inductor according to the comparison result.
In order to improve the recognition accuracy of the frequency cycle time, the duration window time of a plurality of continuous cycles is adopted for comparison, a theoretical window time threshold range is set, and the threshold range is controlled within 10ns, so that the carrier phase control accuracy is within 10 ns. When the window time is greater than the threshold upper limit of the theoretical window time, the carrier frequency is lower than the set 100kHz, the antenna current lags behind the excitation voltage, the antenna tuning network is inductive, and the tuning control unit sends out a fine tuning instruction to reduce the tuning inductance of the antenna tuning network; when the window time is smaller than the threshold lower limit of the theoretical window time, the carrier frequency is higher than the set 100kHz, the antenna current is advanced to the excitation voltage, the antenna tuning network is capacitive, the tuning control unit sends out a fine tuning instruction, and the tuning inductance of the output network is increased; the tuning inductance is finely adjusted through multiple closed loops, so that the tuning inductance completely compensates the antenna reactance, and the center frequency of the carrier wave of the transmitted Roland waveform precisely works at 100kHz. In one embodiment, the criterion for the tuning inductance to fully compensate for the antenna reactance is that the antenna tuning network reactance including the transmitting antenna after compensation is less than 1% of the original antenna reactance.
For example, the Roland monitoring unit calculates a window time for sampling the fifth half-cycle zero-crossing to the twelfth half-cycle zero-crossing of the Roland pulse carrier. The theoretical window time is 7 x 5 us=35 us, and given an effective threshold range (35.005us, 34.005us) of the theoretical window time, the threshold range is controlled within 10ns, and the carrier phase control accuracy is within 10 ns.
When the window time is greater than the upper threshold 35.005us of the theoretical window time, which indicates that the carrier frequency is lower than the set 100kHz, the antenna current lags behind the excitation voltage and the antenna tuning network is inductive, as shown in fig. 3. The tuning control unit sends out a fine tuning instruction to reduce the tuning inductance of the antenna tuning network.
When the window time is less than the threshold lower limit 34.005us of the theoretical window time, which indicates that the carrier frequency is higher than the set 100kHz, the antenna current leads the excitation voltage and the antenna tuning network is capacitive, as shown in fig. 4. The tuning control unit sends out a fine tuning instruction to increase the tuning inductance of the output network; the tuning inductance is finely adjusted through multiple closed loops, so that the actual measurement theoretical window time is within the effective threshold range (35.005us, 34.005us) of the theoretical window time, the tuning process is finished, the tuning inductance completely compensates the antenna reactance, and the center frequency of the carrier wave of the emission Roland waveform precisely works at 100kHz.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The precise tuning control method for the inductance of the Roland transmitting antenna tuning network is characterized in that the control method is applied to a tuning control unit, the antenna tuning network is formed by connecting a coarse tuning coil and a fine tuning coil in series, and the control method comprises the following two processes of coarse tuning and fine tuning:
s1, a tuning control unit issues a control command to a Roland transmitter to enable the Roland transmitter to transmit a continuous wave signal with a target set frequency;
S2, the tuning control unit sends a coarse tuning instruction to the coarse tuning coil, so that the inductance of the coarse tuning coil is changed from a maximum value to a minimum value, a peak value of a continuous wave current signal output by the transmitter in the inductance change process is scanned, and the inductance of the coarse tuning coil corresponding to the maximum point of the output current peak value is determined and used as an adjustment result of the coarse tuning coil;
S3, the tuning control unit transmits a Roland pulse transmission control command to the Roland transmitter, so that the transmitter works in a Roland pulse mode, and the transmitter outputs a Roland pulse signal;
S4, the tuning control unit obtains the actual measurement carrier cycle time of the output current of the fine tuning coil, compares the actual measurement carrier cycle time with the cycle time of the target set frequency, and sends a fine tuning instruction to the fine tuning coil according to the comparison result, so that the inductance is subjected to closed-loop fine tuning until the carrier frequency of the Roland pulse output by the transmitter is the target set frequency.
2. The control method according to claim 1, wherein the criterion that the carrier frequency of the output rowland pulse of the transmitter is the target set frequency is: the monitoring window time does not exceed the theoretical window time threshold range.
3. The control method of claim 2, wherein the comparison is performed using a plurality of consecutive periods of duration window time, and when the window time is greater than an upper threshold of the theoretical window time, a fine tuning command is issued to reduce the tuning inductance of the antenna tuning network; and when the window time is smaller than the threshold lower limit of the theoretical window time, a fine tuning instruction is sent out, and the tuning inductance of the output network is increased.
4. The control method of claim 2, wherein the theoretical window time threshold range is within 10 ns.
5. A precise tuning controller for a rochanter transmitting antenna tuning network inductance, comprising: a processor and a memory;
The memory is used for storing computer execution instructions;
the processor configured to execute the computer-executable instructions such that the control method of any one of claims 1 to 4 is performed.
6. A Roland emission waveform carrier phase precision regulation and control system, which is characterized by comprising a coarse tuning coil, a fine tuning coil, a current sampling loop, a Roland signal monitoring unit and a tuning controller according to claim 5;
The input end of the coarse tuning coil is connected with the output end of the Roland transmitter, the output end of the coarse tuning coil is connected with the input end of the fine tuning coil, and the coarse tuning coil is used for adjusting the inductance of the coarse tuning coil according to the received instruction rotation, so that the large-range compensation of the reactance of the transmitting antenna is realized;
The output end of the fine-tuning coil is connected with the transmitting antenna and is used for adjusting the inductance of the fine-tuning coil according to the received instruction rotation so as to realize the accurate compensation of the reactance of the transmitting antenna;
The current sampling loop is used for collecting the Rogowski current signal at the output end of the fine-tuning coil, converting the Rogowski current signal into a low-level signal in an equal proportion, and feeding the low-level signal back to the Rogowski signal monitoring unit;
The Roland signal monitoring unit is used for receiving the sampling signal, and sending the carrier window time to the tuning controller after carrying out carrier identification.
7. The regulation system of claim 6, wherein the rowland signal monitoring unit comprises: an AD sampling circuit and an FPGA signal processing circuit;
The AD sampling circuit is used for performing discretization sampling on the received sampling signals and sending the discretization sampling signals to the FPGA signal processing circuit;
The FPGA signal processing circuit is used for locking the Roland waveform according to a Roland signal searching algorithm, identifying the zero crossing point of the carrier wave of the Roland signal, counting the carrier period through the counter, calculating carrier period time and carrier window time, and sending the carrier window time to the tuning control unit.
8. The regulation system of claim 7, wherein the sampling rate of the AD sampling circuit is greater than 10 times the transmit frequency.
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| DE10237447A1 (en) * | 2002-08-16 | 2004-03-04 | Detectis Gmbh | Method for defining receiver position uses LORAN-C signal which is demodulated and mixed with time and value signal and evaluated |
| CN107294548B (en) * | 2017-06-06 | 2019-09-17 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of LoranC system transmitter main circuit and its transmitted waveform generation method |
| CN107342826A (en) * | 2017-08-25 | 2017-11-10 | 福建星海通信科技有限公司 | A kind of method that medium wave navigation terminal and its intelligence cut frequency and self-adapting tuning |
| CN111726317B (en) * | 2020-05-25 | 2021-06-01 | 中山大学 | Rowland C signal modulation method, device, equipment and storage medium |
| CN111654296A (en) * | 2020-06-28 | 2020-09-11 | 中国电子科技集团公司第二十研究所 | High-power Rowland C waveform synthesis method |
| CN113381521A (en) * | 2021-06-14 | 2021-09-10 | 中国电子科技集团公司第二十研究所 | Rowland C transmitter main circuit with forward voltage synthesis |
| CN115733503B (en) * | 2022-11-29 | 2024-05-17 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A Loran C transmitter and control method thereof |
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| AU2003225505A1 (en) * | 2002-05-07 | 2003-11-11 | Megapulse Inc. | Improved high-power solid-state switch for dynamic antenna modulation tuning |
| CN107332574A (en) * | 2017-08-11 | 2017-11-07 | 北京北广科技股份有限公司 | A kind of high-power Loran-C pulse emitter and its waveform modulated method |
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