CN109239740B - Data sending method and device and data receiving method and device - Google Patents
Data sending method and device and data receiving method and device Download PDFInfo
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- CN109239740B CN109239740B CN201811079915.0A CN201811079915A CN109239740B CN 109239740 B CN109239740 B CN 109239740B CN 201811079915 A CN201811079915 A CN 201811079915A CN 109239740 B CN109239740 B CN 109239740B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/40—Correcting position, velocity or attitude
- G01S19/41—Differential correction, e.g. DGPS [differential GPS]
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- Manufacturing & Machinery (AREA)
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Abstract
The invention discloses a data transmission method, which comprises the steps of obtaining an analog broadcast signal to be transmitted and differential data; determining a target frequency range according to the frequency range occupied by the analog broadcast signal; generating a digital broadcast signal located in the target frequency range from the differential data; combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal; and transmitting the digital-analog broadcast signal. The invention also discloses a data sending device, a data receiving method and a data receiving device. The invention can meet the requirement that a large number of users use differential data to correct navigation positioning accuracy simultaneously within a long-distance coverage range.
Description
Technical Field
The present invention relates to the field of data transmission technologies, and in particular, to a data transmission method, a data transmission device, a data reception method, and a data reception device.
Background
At present, a high-precision navigation satellite ground-based augmentation system network is mostly adopted to provide differential data for a navigation device so as to improve the navigation and positioning precision of the navigation device.
The transmission channel for the existing distribution of differential data generally adopts two methods, namely a data transmission station and the internet. The effective action distance of the data transmission radio station is short, the internet has the upper limit of the systematic capacity of multi-user concurrence, and the system is crashed when the number of response persons exceeds a threshold value, so that the existing differential data distribution mode cannot meet the requirement that remote and mass users receive differential data at the same time.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a data sending method, aiming at meeting the requirement that a large number of users use differential data to correct navigation positioning accuracy in a long-distance coverage range.
In order to achieve the above object, the present invention provides a data transmission method, including the steps of:
acquiring an analog broadcast signal to be transmitted and differential data;
determining a target frequency range according to the frequency range occupied by the analog broadcast signal;
generating a digital broadcast signal located in the target frequency range from the differential data;
combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal;
and transmitting the digital-analog broadcast signal.
Optionally, the step of determining a target frequency range according to the frequency range occupied by the analog broadcast signal includes:
determining a standard frequency band in which the analog broadcast signal is located;
and taking the frequency range outside the frequency range occupied by the analog broadcast signal in the standard frequency band as the target frequency range.
Optionally, the step of generating a digital broadcast signal located in the target frequency range according to the differential data includes:
coding the differential data to obtain a signal code;
and modulating the signal codes according to the target frequency range to form digital broadcast signals.
Optionally, the step of encoding the differential data to obtain a signal code includes:
dividing the differential data into a plurality of data segments;
coding each data segment respectively to obtain a plurality of signal codes;
the step of modulating the signal code according to the target frequency range to form a digital broadcast signal comprises:
selecting a plurality of target frequency bands with the bandwidth less than or equal to a preset bandwidth from the target frequency range, wherein the target frequency bands correspond to the signal codes one by one;
and modulating the corresponding signal codes according to the target frequency bands respectively to form digital broadcast signals.
Optionally, the step of modulating the signal code corresponding to each target frequency band according to each target frequency band to form a digital broadcast signal includes:
respectively adding preset correction codes to the signal codes;
and respectively modulating corresponding signal codes containing preset correction codes according to the target frequency band to form digital broadcast signals.
In order to achieve the above object, the present application also provides a data transmission device including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the data transmission method as described in any one of the above.
In order to achieve the above object, the present application also provides a data receiving method for receiving differential data, based on the data transmitting method according to any one of the above aspects, the data receiving method including:
acquiring a digital-analog broadcast signal;
extracting digital broadcasting signals in the digital-analog broadcasting signals according to a target frequency range;
and analyzing the digital broadcast signal to obtain differential data.
Optionally, the step of analyzing the digital broadcast signal to obtain differential data includes:
demodulating the digital broadcast signal to obtain a plurality of signal codes;
decoding each signal code respectively to obtain a plurality of data segments;
and synthesizing a plurality of data segments to obtain differential data.
Optionally, before the step of decoding each signal code to obtain a plurality of data segments, the method further includes:
extracting correction codes in each signal code;
respectively judging whether each correction code is consistent with a preset correction code;
and when the correction code in the signal code is inconsistent with the preset correction code, adjusting the corresponding signal code according to the difference between the correction code and the preset correction code.
In addition, in order to achieve the above object, the present application further provides a data receiving apparatus for navigation positioning, wherein the data receiving apparatus includes: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, implements the steps of the data receiving method as described in any one of the above.
According to the data transmission method provided by the embodiment of the invention, the digital broadcast signal formed by the differential data is mixed with the existing analog broadcast signal to form the digital-analog broadcast signal, and then the digital-analog broadcast signal is transmitted, so that the range of differential data transmission is as large as the coverage range of the analog broadcast signal, and because the differential data is broadcast, the differential data can be simultaneously received by users in the broadcast coverage range no matter how many users are used for navigation positioning correction, and therefore, the requirement that a large number of users simultaneously use the differential data to correct navigation positioning accuracy in the remote coverage range is realized.
Drawings
Fig. 1 is a schematic hardware configuration diagram of a data transmission apparatus according to an embodiment of the present invention;
fig. 2 is a schematic hardware configuration diagram of a data receiving apparatus according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating an embodiment of a data transmission method according to the present invention;
fig. 4 is a flowchart illustrating a data transmission method according to another embodiment of the present invention;
fig. 5 is a flowchart illustrating a data transmission method according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating a data receiving method according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a data receiving method according to another embodiment of the present invention;
fig. 8 is a flowchart illustrating a data receiving method according to another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: acquiring an analog broadcast signal to be transmitted and differential data; determining a target frequency range according to the frequency range occupied by the analog broadcast signal; generating a digital broadcast signal located in the target frequency range from the differential data; combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal; and transmitting the digital-analog broadcast signal.
In the prior art, differential data distribution modes such as a data transmission radio station and the Internet cannot meet the requirement that a large number of remote users receive differential data simultaneously.
The invention provides a solution, which enables differential data and analog broadcast signals to form digital-analog broadcast signals and then broadcast, thereby realizing the requirement that a large number of users use the differential data to correct navigation positioning accuracy within a long-distance coverage range.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a data transmission apparatus in a hardware operating environment of a data transmission method according to an embodiment of the present invention. The data transmitting apparatus is specifically configured to transmit a digital-analog broadcast signal generated based on the differential data.
As shown in fig. 1, the data transmission apparatus may include: a first processor 1001, e.g. a CPU, a first memory 1002, a data interface 1003, a first communication bus. Wherein the first communication bus is used for realizing connection communication among the components. The first memory 1002 may be a high-speed RAM first memory, or may be a non-volatile memory (non-volatile memory), such as a magnetic disk first memory. The first memory 1002 may alternatively be a storage device separate from the first processor 1001.
Those skilled in the art will appreciate that the configuration of the device shown in fig. 1 is not intended to be limiting of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the first memory 1002, which is a kind of computer storage medium, may include therein a data interface module and a data transmission program.
In the apparatus shown in fig. 1, the data interface 1003 is mainly used for connecting a base station that provides analog broadcast audio program data units and high-precision navigation satellite differential data. The first processor 1001 may be configured to call the data transmission program stored in the first memory 1002, and perform the operations of the following steps of the data transmission method:
acquiring an analog broadcast signal to be transmitted and differential data;
determining a target frequency range according to the frequency range occupied by the analog broadcast signal;
generating a digital broadcast signal located in the target frequency range from the differential data;
combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal;
and transmitting the digital-analog broadcast signal.
The data transmission device can be composed of a plurality of separated devices, and different steps in the data transmission method can be executed by different devices respectively. The specific data transmission device may include:
the analog frequency modulation broadcast exciter is used for receiving audio data of an analog frequency modulation broadcast audio program and generating an analog broadcast signal to be transmitted within a preset frequency range according to the audio data;
the system comprises a basic system transmitting end exciter, a frequency range determining module and a frequency range determining module, wherein the basic system transmitting end exciter is used for acquiring differential data transmitted by a base station and an analog broadcast signal to be transmitted and determining a target frequency range according to a frequency range occupied by the analog broadcast signal; a digital broadcast signal located in a target frequency range is generated from the differential data.
The combiner is respectively in communication connection with the analog FM broadcast exciter and the exciter of the transmitting end of the basic combination system and is used for acquiring an analog broadcast signal and a digital broadcast signal to be transmitted and combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal;
and the analog FM broadcasting station broadcasting equipment is connected with the combiner and is used for transmitting the digital-analog broadcasting signals.
The first processor 1001 may be provided with a plurality of sub-processing modules, the first memory 1002 may be provided with a plurality of sub-memory modules, and the sub-processing modules and the sub-memory modules may be respectively installed on the analog fm broadcast exciter, the baseband system transmitting end exciter, the combiner, and the analog fm broadcast station broadcasting device, so as to perform the operations of the steps related to the data transmission method in the following embodiments.
Further, the present application also proposes a computer storage medium having a data transmission program stored thereon, which when executed by the processor 1001, implements the steps of the data transmission method described in the following embodiments.
In addition, the invention also provides a data receiving device for navigation positioning. As shown in fig. 2, the data receiving apparatus may include: a second processor 2001, e.g., a CPU, a second memory 2002, a second communication bus. Wherein the second communication bus is used for realizing connection communication among the components. The second memory 2002 may be a high-speed RAM second memory or may be a non-volatile memory (e.g., a magnetic disk second memory). The second memory 2002 may alternatively be a storage device separate from the second processor 2001 described previously.
Those skilled in the art will appreciate that the configuration of the device shown in fig. 2 is not intended to be limiting of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
In the apparatus shown in fig. 2, the second processor 2001 may be configured to call the data receiving program stored in the second memory 2002, and perform the operations of the relevant steps of the data receiving method in the following embodiments:
acquiring the digital-analog broadcast signal;
extracting digital broadcasting signals located in the target frequency range from the digital-analog broadcasting signals;
and analyzing the digital broadcast signal to obtain differential data.
Further, the present application also proposes a computer storage medium having stored thereon a data reception program which, when executed by the processor 2001, implements the steps of the data reception method described in the following embodiments.
Referring to fig. 3, an embodiment of the present invention provides a data sending method, where the data sending method includes:
step S10, acquiring analog broadcast signals and differential data to be transmitted;
the analog broadcast signal to be transmitted can be specifically acquired from an analog fm broadcast exciter. The analog FM broadcast exciter receives audio data of an analog FM broadcast audio program and generates an analog broadcast signal to be transmitted within a preset frequency range according to the audio data. Because the existing analog FM broadcast audio programs are all provided with corresponding preset frequency ranges, different audio programs are corresponding to different preset frequency ranges for broadcasting analog broadcast signals formed by the audio data of the audio programs. After receiving the audio data, the preset frequency range corresponding to the audio program of the audio data can be determined, and the audio data is encoded and modulated to form an analog broadcast signal in the preset frequency range.
The differential data is a correction value provided to the user equipment using the navigation positioning function through a data link after the coordinate error of the reference station is measured by using the ground reference station, so that the navigation positioning precision of the user equipment is improved. Differential data may be acquired in a manner that cooperates with a local mapping department; the method can be obtained by purchasing an account number of a high-precision navigation satellite differential data service provider; the method can also be used for self-erecting a high-precision navigation satellite reference station.
Step S20, determining a target frequency range according to the frequency range occupied by the analog broadcast signal;
because the audio data of different audio programs occupy different preset frequency ranges in the analog broadcast signals, the exciter of the transmitting end of the basic system can acquire the analog broadcast signals to be transmitted and determine the frequency ranges occupied by the analog broadcast signals. And determining a target frequency range according to the frequency range occupied by the analog broadcast signal, wherein the target frequency range is used as a frequency band for transmitting the digital broadcast signal.
Specifically, the step of determining the target frequency range according to the frequency range occupied by the analog broadcast signal includes:
step S21, determining the standard frequency band of the analog broadcast signal;
since information transmitted by radio waves is various, for reasons of information security, information propagation distance requirements, information interference avoidance, and the like, different standard frequency bands are divided in the communication field according to different propagation signals. For example, the standard frequency band of FM broadcasting is 87.5-108 MHz. In the standard frequency band where the analog broadcast signal is located, different fm broadcast audio programs may be allocated with respective preset frequency ranges, but the analog broadcast signal and the digital-analog broadcast signal synthesized from the analog broadcast signal may be broadcast only within the range of the standard frequency band, and the standard frequency band includes the preset frequency range.
Step S22, regarding a frequency range outside the frequency range occupied by the analog broadcast signal in the standard frequency band as the target frequency range.
In order to avoid interference of analog broadcast signals of different audio programs, certain frequency bands are separated between preset frequency ranges corresponding to the analog broadcast signals of the different audio programs, and between the preset frequency ranges and the critical value of the standard frequency band.
In order to avoid mutual interference between the analog broadcast signal and the digital broadcast signal, the frequency range outside the frequency range occupied by the analog broadcast signal in the standard frequency band, that is, the frequency bands of the above intervals may be used as the target frequency range as the frequency range for transmitting the digital broadcast signal.
In addition, the frequency range occupied by the analog broadcast signal can be used as a target frequency range according to actual requirements, and the analog broadcast signal and the digital broadcast signal can be simultaneously transmitted in the same frequency range.
Step S30, generating a digital broadcast signal located in the target frequency range from the differential data;
to realize that the differential data can be broadcast simultaneously with the analog broadcast signal, the differential data needs to be simulated to form a digital broadcast signal. The target frequency range includes spaced frequency bands, and in particular, the differential data is generated as a digital broadcast signal in one or more of the frequency bands within the target frequency range. Specifically, step S31 includes:
step S31, encoding the differential data to obtain signal codes;
and performing LDPC channel coding on the differential data according to a preset coding structure to obtain signal coding. The differential data is digital data, and is generally characterized by binary equivalence in the transmission process. The signal encoding is in particular an analog signal encoding of the differential data, i.e. the sinusoidal is used as a carrier to carry the differential data to be transmitted.
In the encoding, the differential data may be encoded together with a characteristic field for identifying the differential data, so that the differential data may be extracted when the digital broadcast signal formed by the differential data and other digital data is transmitted simultaneously, and the digital broadcast signal may be analyzed. That is, the signal encoding includes the encoding result generated by the differential data encoding and the encoding result generated by the characteristic field encoding for identifying the differential data.
Step S32, modulating the signal code according to the target frequency range to form a digital broadcast signal.
The signal codes are modulated by OFDM to form radio waves with carrier frequency in target frequency range, and digital broadcast signals are formed. That is, the spectrum of the signal code is modulated into the target frequency range to form a digital broadcast signal, so that the signal carrying the differential data information can be transmitted in the target frequency range.
Step S40, combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal;
the combiner receives an analog broadcast signal to be transmitted and a digital broadcast signal formed according to the differential data, and combines two paths of broadcast signals into one path of signal to form a digital-analog broadcast signal.
And step S50, sending the digital-analog broadcast signal.
And D/A broadcast signals are transmitted in real time through the broadcasting equipment of the analog FM broadcasting station.
In the embodiment, a data transmission method is provided, in which a digital broadcast signal formed by differential data is mixed with an existing analog broadcast signal to form a digital-analog broadcast signal, and then the digital-analog broadcast signal is transmitted, so that the range of differential data transmission is as large as the coverage range of the analog broadcast signal.
Further, referring to fig. 4, in the embodiment of the present invention, the step of encoding the differential data to obtain a signal code includes:
step S311, dividing the differential data into a plurality of data segments;
and dividing the differential data into a plurality of data segments according to a preset data length. The preset data length is specifically the byte number, the digit number and the like of the data. The data length of each data segment is less than or equal to a preset data length.
Step S312, each data segment is encoded to obtain a plurality of signal codes.
And each data segment is subjected to LDPC coding according to a preset coding structure to obtain a plurality of signal codes. However, since a certain combination order is inevitably present between the data segments when the differential data is divided, if the combination order is not correct when the data segments are combined, the differential data is erroneous. During encoding, each data segment can be encoded simultaneously with the sequence identification of the data segment, the sequence identification can be identified by a data receiving device, and the data segments are combined and restored into differential data according to a preset sequence. Each signal encoding thus comprises an encoding result formed by a data segment and an encoding result formed by a sequence identification of the data segment.
The step of modulating the signal code according to the target frequency range to form a digital broadcast signal comprises:
step S321, selecting a plurality of target frequency bands with bandwidths less than or equal to a preset bandwidth from the target frequency range, wherein the target frequency bands correspond to the signal codes one by one;
determining the bandwidth of each interval frequency band in the target frequency range, and when the bandwidth is less than or equal to the preset bandwidth, directly taking the frequency band as the target frequency band; when the bandwidth is greater than the preset bandwidth, the frequency band greater than the preset bandwidth can be divided to obtain a plurality of sub-frequency bands with the bandwidth less than or equal to the preset bandwidth, and the sub-frequency bands are used as target frequency bands.
The number of target frequency bands is the same as the number of signal codes, and one target frequency band is paired with one signal code. When the signal codes contain sequence identifications of digital sections, the target frequency band and the signal codes can be paired randomly, when the signal codes do not contain the sequence identifications of the digital sections, the signal codes and the target frequency band can be paired in sequence according to a preset rule, and if a plurality of data sections are arranged according to a combination sequence, the data sections corresponding to the data sections are paired in sequence from small to large according to the frequency in the target frequency band.
Step S322 modulates the corresponding signal codes according to the target frequency bands, respectively, to form digital broadcast signals.
And modulating the frequency spectrum coded by each signal into a corresponding target frequency band through OFDM to form a digital broadcast signal. Wherein, the carriers formed after the modulation of the signal numbers are mutually orthogonal in the target frequency bands.
In this embodiment, the differential data is segmented and transmitted in the above manner, and the same differential data forms a digital broadcast signal that is transmitted simultaneously in multiple frequency bands, so that the information carried by the data segments into which the differential data is segmented can be transmitted in parallel in a broadcast manner, the data receiving device can simultaneously receive the digital-analog broadcast signal and analyze the digital-analog broadcast signal to obtain multiple data segments, and the multiple data segments are combined into the differential data, thereby ensuring the real-time performance of the differential data received by the data receiving device and improving the accuracy of the data receiving device in navigation and positioning.
Further, referring to fig. 5, in this embodiment, the step of modulating the signal code corresponding to each target frequency band according to each target frequency band to form a digital broadcast signal includes:
step S3221, adding preset correction codes to each of the signal codes, respectively;
the preset correction code may be specifically a preset code result encoded by preset information, a code result encoded without carrying information, a code result encoded by information having a preset correspondence, and the like. The same preset correction code is added at a preset position in the signal code generated for each data segment, e.g. at the beginning and/or end of each signal code.
Step S3222, respectively forming digital broadcast signals according to the signal codes containing the preset correction codes corresponding to the target frequency band modulation.
And respectively modulating the frequency spectrums added with the signal codes of the preset correction codes into corresponding target frequency bands to form digital broadcast signals.
In this embodiment, by adding the preset correction code to the signal code, the data receiving device can perform signal correction in the process of analyzing the digital broadcast signal to obtain the differential data, thereby avoiding the inaccuracy of the differential data received by the data receiving device due to the distortion of the signal in the signal transmission process, improving the accuracy of the differential data obtained by the data receiving device, and ensuring the navigation positioning accuracy of the data receiving device.
In addition, based on the data transmission method in the foregoing embodiment, as shown in fig. 6, the present invention further provides a data reception method for receiving differential data, where the data reception method includes:
step S60, acquiring digital-analog broadcast signals;
the data receiving device can adjust the resonance receiving frequency of the antenna, traverse the standard frequency band and collect digital-analog broadcasting signals broadcasted in the standard frequency band.
Step S70, extracting a digital broadcast signal from the digital-analog broadcast signals according to a target frequency range;
the target frequency range may be preset in the data reception apparatus in advance. In addition, the data transmitting device can also upload the target frequency range to the network, and the data receiving device can acquire the target frequency range through the internet.
According to the target frequency range, the analog broadcast signals and the digital broadcast signals in the digital-analog broadcast signals are separated, and the digital broadcast signals transmitted in the target frequency range are extracted.
Step S80, the digital broadcast signal is analyzed to obtain differential data.
The process of digital broadcast signal analysis and the process of digital broadcast signal generation are inverse processes. Specifically, the digital broadcast signal may be demodulated to obtain a signal code corresponding to a modulation process of the digital broadcast signal, and then the signal code is decoded to obtain differential data. The encoding and decoding processes of the signal encoding are inverse processes.
In this embodiment, the differential data is obtained by acquiring the digital-analog broadcast signal and analyzing the digital-analog broadcast signal, and the reception of the differential data is realized in a frequency modulation broadcast manner, so that the user of the differential data is not limited by the capacity of the network system, and the differential data can be used in a large broadcast coverage range.
Specifically, as shown in fig. 7, the step of analyzing the digital broadcast signal to obtain differential data includes:
step S81, demodulating the digital broadcast signal to obtain a plurality of signal codes;
during modulation, the differential data are segmented and then encoded and modulated respectively to generate digital broadcast signals in different target frequency bands in a target frequency range. Therefore, demodulating digital broadcasting results in a plurality of signal codes corresponding to a plurality of target frequency bands.
Step S82, decoding each signal code to obtain a plurality of data segments;
each signal code is decoded according to the inverse of the encoding process to obtain a plurality of data segments.
And step S83, synthesizing a plurality of data segments to obtain differential data.
Because the sequence identification of the data segments can be added in the coding process, the data segments can be sequenced according to the sequence identification, and differential data can be obtained by synthesis after sequencing. In addition, the plurality of data segments are also synthesized to obtain differential data according to a preset rule in the process of generating the digital broadcast signal.
In this embodiment, the digital broadcast signal carrying the differential data, which is transmitted in segments after being divided, is analyzed, and the differential data obtained by reduction is used for navigation positioning, which is beneficial to ensuring the real-time performance of the received differential data.
Specifically, as shown in fig. 8, before the step of decoding each signal code to obtain a plurality of data segments, the method further includes:
step S801, extracting correction codes in each signal code;
since the correction code at the time of encoding is added to a preset position (e.g., the beginning and/or end of the code) in the signal code formed of the differential data, the corresponding correction code can be extracted from the preset position of each signal code according to a predetermined protocol.
Step S802, respectively judging whether each correction code is consistent with a preset correction code;
the preset correction code can be preset in the data receiving device or can be obtained in advance through the internet. The preset correction code is a correction code added in signal coding of differential data when forming a digital broadcast signal from the differential data. Comparing the extracted correction codes with preset correction codes respectively, judging whether the correction codes are consistent with the preset correction codes, and if so, indicating that the signal codes are not distorted in the transmission process; if not, it indicates that the signal code has distortion in the transmission process.
Step S803, when the correction code in the signal code is inconsistent with the preset correction code, adjusting the corresponding signal code according to the difference between the correction code and the preset correction code.
Defining the signal code with the inconsistent correction code and the preset correction code as an error code, determining the difference between the encoded correction code and the preset correction code (such as the number of the code differences, the positions of the code differences and the like), and correcting the error code corresponding to the determined difference.
And correcting the error codes to obtain signal codes and decoding the signal codes without adjustment to obtain a plurality of data segments.
By the method, whether the signals received by the differential data user are accurate can be judged by comparing the extracted correction codes with the preset correction codes, and when the correction codes are different from the preset correction codes, the signal codes are adjusted according to the difference, so that the accuracy of the differential data synthesized by the data segments obtained by decoding the signal codes is ensured, and the navigation positioning accuracy of the differential data user is ensured.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the 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 solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A data transmission method, characterized in that the data transmission method comprises the steps of:
acquiring an analog broadcast signal to be transmitted and differential data;
determining a target frequency range according to the frequency range occupied by the analog broadcast signal;
generating a digital broadcast signal located in the target frequency range from the differential data;
combining the analog broadcast signal and the digital broadcast signal to form a digital-analog broadcast signal;
transmitting the digital-analog broadcast signal;
the step of generating a digital broadcast signal located in the target frequency range from the differential data includes:
coding the differential data to obtain a signal code;
modulating the signal code according to the target frequency range to form a digital broadcast signal;
the step of encoding the differential data to obtain a signal code includes:
dividing the differential data into a plurality of data segments;
coding each data segment respectively to obtain a plurality of signal codes;
the step of modulating the signal code according to the target frequency range to form a digital broadcast signal comprises:
selecting a plurality of target frequency bands with the bandwidth less than or equal to a preset bandwidth from the target frequency range, wherein the target frequency bands correspond to the signal codes one by one;
and modulating the corresponding signal codes according to the target frequency bands respectively to form digital broadcast signals.
2. The data transmission method as claimed in claim 1, wherein the step of determining the target frequency range according to the frequency range occupied by the analog broadcast signal comprises:
determining a standard frequency band in which the analog broadcast signal is located;
and taking the frequency range outside the frequency range occupied by the analog broadcast signal in the standard frequency band as the target frequency range.
3. The data transmission method as claimed in claim 1, wherein the step of modulating the corresponding signal code according to each of the target frequency bands to form a digital broadcast signal comprises:
respectively adding preset correction codes to the signal codes;
and respectively modulating corresponding signal codes containing preset correction codes according to the target frequency band to form digital broadcast signals.
4. A data transmission apparatus, characterized in that the data transmission apparatus comprises: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the data transmission method according to any one of claims 1 to 3.
5. A data receiving method for receiving differential data based on the data transmission method according to any one of claims 1 to 3, the data receiving method comprising:
acquiring a digital-analog broadcast signal;
extracting digital broadcasting signals in the digital-analog broadcasting signals according to a target frequency range;
and analyzing the digital broadcast signal to obtain differential data.
6. The data receiving method of claim 5, wherein the step of parsing the digital broadcast signal to obtain differential data comprises:
demodulating the digital broadcast signal to obtain a plurality of signal codes;
decoding each signal code respectively to obtain a plurality of data segments;
and synthesizing a plurality of data segments to obtain differential data.
7. The data receiving method of claim 6 wherein said step of separately decoding each signal code to obtain a plurality of data segments is preceded by the step of:
extracting correction codes in each signal code;
respectively judging whether each correction code is consistent with a preset correction code;
and when the correction code in the signal code is inconsistent with the preset correction code, adjusting the corresponding signal code according to the difference between the correction code and the preset correction code.
8. A data receiving device for navigation positioning, the data receiving device comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when being executed by the processor, carries out the steps of the data receiving method according to one of claims 5 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811079915.0A CN109239740B (en) | 2018-09-13 | 2018-09-13 | Data sending method and device and data receiving method and device |
| PCT/CN2018/106388 WO2020051937A1 (en) | 2018-09-13 | 2018-09-19 | Data transmission method and device and data receiving method and device |
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| CN201811079915.0A CN109239740B (en) | 2018-09-13 | 2018-09-13 | Data sending method and device and data receiving method and device |
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| CN110072187B (en) * | 2019-04-19 | 2020-05-15 | 深圳思凯微电子有限公司 | Method and device for distributing and receiving differential data |
| CN111447676B (en) * | 2020-03-16 | 2021-10-01 | 苏州星恒通导航技术有限公司 | System based on differential data source matching |
| CN113765571B (en) * | 2020-06-03 | 2022-12-30 | 千寻位置网络有限公司 | Method and system for sending and receiving GNSS data |
| CN113986807B (en) * | 2021-11-09 | 2024-04-05 | 阳光学院 | Protocol conversion method and protocol converter for USB bus and PC104 bus |
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| CN102436000A (en) * | 2011-11-24 | 2012-05-02 | 北京航空航天大学 | Signal quality monitoring method and device |
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| US8044857B2 (en) * | 2009-08-26 | 2011-10-25 | Raytheon Company | System and method for correcting global navigation satellite system pseudorange measurements in receivers having controlled reception pattern antennas |
| CN103364758A (en) * | 2012-03-28 | 2013-10-23 | 陈曦 | Navigational positioning method and navigational positioning system |
| JP5983947B2 (en) * | 2013-04-15 | 2016-09-06 | 日本電気株式会社 | Positioning terminal and precision single positioning method |
| CN204009079U (en) * | 2014-04-10 | 2014-12-10 | 深圳思凯微电子有限公司 | Differential position system, frequency-modulated broadcast transmitter, navigation signal receiver |
| CN103983995B (en) * | 2014-04-10 | 2017-01-25 | 深圳思凯微电子有限公司 | Differential positioning method and system, frequency-modulated broadcast transmitter and navigation signal receiver |
| US10459087B2 (en) * | 2016-04-26 | 2019-10-29 | Uber Technologies, Inc. | Road registration differential GPS |
| CN107024700A (en) * | 2017-03-29 | 2017-08-08 | 国家新闻出版广电总局广播科学研究院 | A kind of satellite navigation information Transmission system, emitter and reception device |
| CN107564330A (en) * | 2017-09-22 | 2018-01-09 | 南京维智感网络科技有限公司 | Intelligent parking management device and its method based on double antenna difference and berth lock |
| CN107942353B (en) * | 2017-11-09 | 2019-11-19 | 深圳思凯微电子有限公司 | Two-channel satellite navigation differential data method of reseptance, receiver and storage medium |
| CN107947884A (en) * | 2017-11-17 | 2018-04-20 | 深圳思凯微电子有限公司 | A kind of digital-to-analogue broadcast singal combining device and method |
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| CN102436000A (en) * | 2011-11-24 | 2012-05-02 | 北京航空航天大学 | Signal quality monitoring method and device |
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| WO2020051937A1 (en) | 2020-03-19 |
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