CN111726317B - Rowland C signal modulation method, device, equipment and storage medium - Google Patents
Rowland C signal modulation method, device, equipment and storage medium Download PDFInfo
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- CN111726317B CN111726317B CN202010518189.9A CN202010518189A CN111726317B CN 111726317 B CN111726317 B CN 111726317B CN 202010518189 A CN202010518189 A CN 202010518189A CN 111726317 B CN111726317 B CN 111726317B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4902—Pulse width modulation; Pulse position modulation
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Abstract
The application provides a method, a device, equipment and a storage medium for modulating Roland C signals, wherein the method comprises the steps of obtaining information carried by text information and obtaining Roland C signals; determining the information state corresponding to the message according to the mapping relation between the message and the information state set; and respectively modulating the initial phase, the frequency and the time delay of the carrier of the pulse to be modulated in the Rowland C signal according to the information state corresponding to the message to obtain a modulated signal. By modulating a plurality of parameters of initial phase, frequency and time delay of the carrier of the Rowland C signal, the signal state of the Rowland C signal after modulation is increased, so that the modulated pulse can transmit more information, and the transmission rate of data is improved.
Description
Technical Field
The present application relates to the field of information technology, and in particular, to a method, an apparatus, a device, and a storage medium for modulating a loran C signal.
Background
The implementation of the data link function of the loran C system requires an additional modulation based on the phase coding of the loran C burst signal, and the additional modulation is based on the fact that the normal operation of the existing navigation system and the normal operation of the navigation receiver cannot be affected. Firstly, ensuring the flashing alarm function of the 1 st pulse and the 2 nd pulse, so that the first two pulses can not be modulated; secondly, the receiving locking of the user is ensured and certain interference resistance is achieved.
The existing method for modulating Roland C signals adopts tri-state pulse displacement word balanced modulation, and the basic principle is as follows: the 3 rd to 8 th pulse of each pulse group signal period is subjected to balanced modulation by adopting a transmission time control method, the modulation amount is +/-1 microsecond, and the modulation method can generate 3 signal states: if the transmitting phase leads by 1 microsecond, mapping the transmitting phase into information "-"; if the transmission phase lags behind 1 microsecond, the mapping is information "+"; if the transmission is without a phase shift, then the mapping is to information "0". It can be seen that, in the existing loran C signal modulation method, 3 signal states are generated, one pulse only transmits information of less than 2 bits, and the amount of information is limited, which affects the transmission rate of data.
Disclosure of Invention
The method mainly aims to solve the technical problem that the existing Rowland C signal modulation method is low in data transmission rate.
A method for modulating a loran C signal, comprising the steps of:
acquiring a carrier initial phase value range, a change range of offset values of carrier frequencies and a time delay range of the Rowland C signal;
determining an initial phase set according to the initial phase value range of the carrier; the initial phase set comprises four initial phase values;
determining a frequency set according to the variation range of the offset value of the carrier frequency; the set of frequencies includes eight frequency values;
determining a time delay set according to the time delay range; the set of delays comprises two delay values;
obtaining a first initial phase value from the initial phase set; obtaining a first frequency value from the set of frequencies; acquiring a first time delay value from the time delay set;
the first initial phase value is any one of the initial phase values in the initial phase set;
the first frequency value is any one frequency value in the frequency set;
the first delay value is any one of the delay values in the delay set;
combining the first initial phase value, the first frequency value and the first time delay value to obtain a first information state; finally, all information states are obtained to form an information state set; mapping each information state in the information state set with each type of information carried by the message information one by one;
acquiring a message carried by the telegraph message information and acquiring a Rowland C signal;
determining an information state corresponding to the message according to the mapping relation between the message and the information state set;
and respectively modulating the initial phase, the frequency and the time delay of the carrier of the pulse to be modulated in the Rowland C signal according to the information state corresponding to the message to obtain a modulated signal.
Optionally, the expression of the rowland C signal is:
wherein S represents the Rowland C signal; a is a constant related to the peak current; t is time; tau is time delay; f. ofcIs the carrier frequency; f. ofiIs the carrier frequency fcThe offset value of (a);
is the initial phase of the carrier.
Optionally, the elements of the initial phase set include 0, pi/2, pi, 3 pi/2.
Optionally, the elements of the set of frequencies comprise 92kHz, 94kHz, 96kHz, 98kHz, 100kHz, 102kHz, 104kHz, 106 kHz.
Optionally, the elements of the latency set include 0, 250.
Based on the same technical concept, the present application also provides a loran C signal modulation apparatus, including:
and the acquisition module is used for acquiring the message carried by the message information and acquiring the Rowland C signal.
The processing module is used for determining the information state corresponding to the message according to the mapping relation between the message and the information state set; and respectively modulating the initial phase, the frequency and the time delay of the carrier of the pulse to be modulated in the Rowland C signal according to the information state corresponding to the message to obtain a modulated signal.
Based on the same technical concept, the present application further provides a computer device, which includes an input/output unit, a memory and a processor, wherein the memory stores computer-readable instructions, and the computer-readable instructions, when executed by the processor, cause the processor to execute the steps in the rolan C signal modulation method as described above.
Based on the same technical concept, the present application also provides a storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps in the rolan C signal modulation method as described above.
The beneficial effect of this application: by modulating a plurality of parameters of initial phase, frequency and time delay of the carrier of the Rowland C signal, the signal state of the Rowland C signal after modulation is increased, so that the modulated pulse can transmit more information, and the transmission rate of data is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for modulating a rowland C signal in the embodiment of the present application.
Fig. 2 is a schematic structural diagram of a loran C signal modulation apparatus according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a computer device in an embodiment of the present application.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As used herein, the singular forms "a", "an", "the" and "the" may include the plural forms as well, unless expressly stated otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, procedures, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, procedures, steps, operations, elements, components, and/or groups thereof.
Fig. 1 is a flowchart of a method for modulating a rowland C signal according to some embodiments of the present application, where the method is performed by a rowland C signal modulating apparatus, and the rowland C signal modulating apparatus may be an intelligent apparatus such as a computer, as shown in fig. 1, and may include the following steps S1-S3:
s1, acquiring the message carried by the message information and acquiring the Rowland C signal.
And coding the message information to obtain the message carried by the message information.
The Rowland C system comprises a main station and a plurality of auxiliary stations, because the Rowland C system works at 100kHz low-frequency, the ground wave propagation distance is far no matter on land or on sea, in order to eliminate the interference of sky waves of 100kHz low-frequency signals to ground waves, the Rowland C system adopts a pulse group transmitting mode, namely a pulse group is not transmitted in a period, but a group of pulse group signals with certain intervals are transmitted by adopting a pulse coding signal system of the pulse group. The coding mode is as follows: the master station transmits a single pulse of 9 Rowland C signals per pulse group; the secondary station transmits a single pulse of 8 rowland C signals per pulse group. The interval of the first 8 pulses in the main station pulse group is 1000 microseconds, and the interval of the 8 th pulse and the 9 th pulse is 2000 microseconds; each pulse within the burst of the secondary station is spaced 1000 microseconds apart.
In some embodiments, the expression of the rowland C signal is:
wherein S represents the Rowland C signal; a is a constant related to the peak current; t is time (unit: microsecond); tau is time delay (unit: microsecond); f. ofcIs the carrier frequency; f. ofiFor the current pulse relative to the carrier frequency fcThe offset of (a);
is the initial phase of the carrier.
And S2, determining the information state corresponding to the message carried by the message information according to the mapping relation between the message and the information state set.
In some embodiments, before step S1, the present application further comprises the following steps S011-S016:
and S011, acquiring a carrier initial phase value range, a change range of offset values of carrier frequency and a time delay range of the Rowland C signal.
And S012, determining an initial phase set according to the initial phase value range of the carrier. The initial phase set includes four initial phase values.
Initial phase of carrier wave
A value range of
Four initial phase values of 0, pi/2, pi and 3 pi/2 are selected from the four initial phase values, 4 states are selected in total, and the four initial phase values can be mapped into 2 binary bits.
And S013, determining a frequency set according to the variation range of the offset value of the carrier frequency. The set of frequencies includes eight frequency values.
The central frequency of the Rowland C signal is 100kHz, the working frequency is between 90kHz and 110kHz, and the offset value f of the carrier frequency of the frequency modulation is determined according to the available signal bandwidthiIs set to-8 kHz to 6kHz, 8 frequency values are chosen with an equal difference of 2 kHz: 92kHz, 94kHz, 96kHz, 98kHz, 100kHz, 102kHz, 104kHz, 106kHz, 8 states in total, can be mapped into 3 binary bits.
And S014, determining a time delay set according to the time delay range. The set of delays comprises two delay values.
The pulse duration of a single standard Rowland C signal is approximately 300 microseconds, while the interval between two adjacent pulse signals within a burst of the secondary station is 1000 microseconds. The delay τ is 0 or 250. When the time delay is 250 microseconds, 2 states are available, and the mapping can be carried out to 1 binary bit.
S015, acquiring a first initial phase value from the initial phase set; obtaining a first frequency value from the set of frequencies; and acquiring a first time delay value from the time delay set.
The first initial phase value is any one of the initial phase values in the initial phase set;
the first frequency value is any one frequency value in the frequency set;
the first delay value is any one of the delay values in the delay set.
S016, combining the first initial phase value, the first frequency value and the first time delay value to obtain a first information state; and finally, obtaining all information states to form the information state set. And mapping each information state in the information state set with each type of information carried by the message information one by one.
The 4 initial phase values, 8 frequency values and 2 time delay values are combined to obtain 4 × 8 × 2-64 information states.
And S3, respectively modulating the initial phase, the frequency and the time delay of the carrier of the pulse to be modulated in the Rowland C signal according to the information state corresponding to the message to obtain a modulated signal.
And respectively acquiring corresponding initial phase values, frequency values and time delay values from an initial phase set, a frequency set and a time delay set according to the information state corresponding to the message information. And respectively modulating the initial phase, frequency and time delay of the carrier of the pulse to be modulated in the Rowland C signal into the initial phase value, frequency value and time delay value to obtain a modulated signal.
Specifically, the pulse to be modulated refers to a pulse to be modulated in a pulse group of the rowland C signal, that is, any one of pulses from 3 rd to 8 th in the pulse group. As described in the background, the 1 st and 2 nd pulses of a pulse set are used for a flashing alarm function. Therefore, the first two pulses of the pulse group of the primary and secondary stations cannot be modulated. The 9 th pulse of the pulse group of the primary station is a symbol pulse for identifying the signals of the primary station and the secondary station, and is not used for modulation.
Through the modulation of the initial phase, the frequency and the time delay of the carrier wave, one pulse can transmit 6 bits of information. Under the data transmission scheme, one pulse can transmit 6 bits of information, and the total number is 26And (4) a state. The group repetition period of the pulse signal is calculated according to 40-100 milliseconds, and if the 1/4 code rate channel coding is adopted, the information transmission rate of a single secondary station can reach 15bps to 37.5 bps. With longer information packets, 1/2-rate channel coding is considered, and individual secondary station information transmission rates can reach 30bps to 75 bps.
In the above embodiment, by modulating a plurality of parameters of the initial phase, the frequency and the time delay of the carrier of the loran C signal, the signal state after the loran C signal is modulated is increased, so that the modulated pulse can transmit more information, and the transmission rate of data is improved.
Based on the same technical concept, the application also provides a Roland C signal modulation device which can be used for modulating the Roland C signal. The apparatus in the embodiment of the present application is capable of implementing the steps corresponding to the method of the loran C signal modulation performed in the embodiment corresponding to fig. 1. The functions realized by the device can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. As shown in fig. 2, the apparatus comprises an acquisition module 1 and a processing module 2. The functional implementation of the processing module 2 and the obtaining module 2 may refer to the operations executed in the embodiment corresponding to fig. 1, which are not described herein again. The processing module 2 may be configured to control the transceiving operation of the obtaining module 1.
The acquisition module 1 is used for acquiring messages carried by the telegraph text information and acquiring the Rowland C signal.
The processing module 2 is configured to determine an information state corresponding to the message according to a mapping relationship between the message and an information state set; and respectively modulating the initial phase, the frequency and the time delay of the carrier of the pulse to be modulated in the Rowland C signal according to the information state corresponding to the message to obtain a modulated signal.
In the above embodiment, by modulating a plurality of parameters of the initial phase, the frequency and the time delay of the carrier of the loran C signal, the signal state after the loran C signal is modulated is increased, so that the modulated pulse can transmit more information, and the transmission rate of data is improved.
Based on the same technical concept, the present application further provides a computer device, as shown in fig. 3, the computer device includes an input/output unit 31, a processor 32 and a memory 33, where the memory 33 stores computer readable instructions, and when the computer readable instructions are executed by the processor 32, the processor executes the steps of the loran C signal modulation method in the above embodiments.
The entity device corresponding to the acquisition module 1 shown in fig. 2 is the input/output unit 31 shown in fig. 3, and the input/output unit 31 can implement part or all of the functions of the acquisition module 1, or implement the same or similar functions as the acquisition module 1.
The entity device corresponding to the processing module 2 shown in fig. 2 is the processor 32 shown in fig. 3, and the processor 32 can implement part or all of the functions of the processing module 2, or implement the same or similar functions as the processing module 2.
Based on the same technical concept, the present application also provides a storage medium storing computer-readable instructions, which when executed by one or more processors, cause the one or more processors to perform the steps of the loran C signal modulation method in the above embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM), and includes several instructions for enabling a terminal (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the drawings, but the present application is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many changes and modifications without departing from the spirit and scope of the present application and the protection scope of the claims, and all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (7)
1. A method for modulating Rowland C signals, comprising the steps of:
acquiring a carrier initial phase value range, a change range of offset values of carrier frequencies and a time delay range of the Rowland C signal;
determining an initial phase set according to the initial phase value range of the carrier; the initial phase set comprises four initial phase values;
determining a frequency set according to the variation range of the offset value of the carrier frequency; the set of frequencies includes eight frequency values;
determining a time delay set according to the time delay range; the set of delays comprises two delay values;
obtaining a first initial phase value from the initial phase set; obtaining a first frequency value from the set of frequencies; acquiring a first time delay value from the time delay set;
the first initial phase value is any one of the initial phase values in the initial phase set;
the first frequency value is any one frequency value in the frequency set;
the first delay value is any one of the delay values in the delay set;
combining the first initial phase value, the first frequency value and the first time delay value to obtain a first information state; finally, all information states are obtained to form an information state set; mapping each information state in the information state set with each type of information carried by the message information one by one;
acquiring a message carried by the telegraph message information and acquiring a Rowland C signal;
determining an information state corresponding to the message according to the mapping relation between the message and the information state set;
and respectively modulating the initial phase, the frequency and the time delay of the carrier of the pulse to be modulated in the Rowland C signal according to the information state corresponding to the message to obtain a modulated signal.
2. The method according to claim 1, wherein the Rowland C signal is modulated,
the expression of the Rowland C signal is:
wherein S represents the Rowland C signal; a is a constant related to the peak current; t is time; tau is time delay; f. ofcIs the carrier frequency; f. ofiIs the carrier frequency fcThe offset value of (a);
is the initial phase of the carrier.
3. The method according to claim 1, wherein the Rowland C signal is modulated,
the elements of the initial phase set comprise 0, pi/2, pi and 3 pi/2.
4. The method according to claim 1, wherein the Rowland C signal is modulated,
the elements of the set of frequencies include 92kHz, 94kHz, 96kHz, 98kHz, 100kHz, 102kHz, 104kHz, 106 kHz.
5. The method according to claim 1, wherein the Rowland C signal is modulated,
the elements of the latency set include 0, 250.
6. A computer device comprising an input-output unit, a memory and a processor, the memory having stored therein computer-readable instructions which, when executed by the processor, cause the processor to perform the steps in the roland C signal modulation method according to any one of claims 1 to 5.
7. A storage medium storing computer readable instructions which, when executed by one or more processors, cause the one or more processors to perform the steps in the roland C signal modulation method according to any one of claims 1 to 5.
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| 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 |
| CN115296967B (en) * | 2022-07-19 | 2023-09-08 | 中国人民解放军国防科技大学 | Enhanced Roland signal waveform and modulation method based on linear frequency modulation |
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