CN115695116B - Tracking signaling control method and device based on time synchronization - Google Patents
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Abstract
The invention belongs to the technical field of signal transmission and discloses a tracking and signaling control method and device based on time synchronization.
Description
Technical Field
The invention relates to a tracking and signaling control method and device based on time synchronization, belonging to the technical field of signal transmission, in particular to the technical field of the tracking and signaling control method and device based on time synchronization.
Background
With the improvement of the modern communication technology level, the wide application of the communication technology has brought great convenience to human beings, and gradually becomes one of important forces for promoting the development of human society, according to the statistical data analysis of Beijing, the global communication market reaches 22473.78 hundred million dollars in 2021, and the market scale of communication equipment reaches about 925 hundred million dollars in 2020.
On the other hand, 2021 worldwide cyber crimes cause losses of over 6 trillion dollars, which have led people to carefully think about the security problem of communication, and the security of communication is constantly enhanced by improving technical means. Communication security relates to the security of each link in the whole communication process, wherein the security of the transmission process is an important loop. In order to prevent information from being illegally acquired in the signal transmission process, one of the precautions is to use a data encryption mode, so that an illegal person cannot obtain valuable contents from the information even if the information is acquired; another approach is to encrypt the channel, making it difficult for an illegitimate to capture the channel and thus not obtain the information.
Disclosure of Invention
The invention aims at: a tracking and signaling control method and device based on time synchronization are provided, so as to solve the problem that the existing information cannot be synchronously tracked in the transmission process, and the carrier hopping is easy to be captured by an adversary.
The technical scheme adopted by the invention is as follows:
a control method and device for tracking and signaling based on time synchronization comprises a control method for tracking and signaling based on time synchronization and a control device for tracking and signaling based on time synchronization;
the control method for tracking signaling based on time synchronization comprises the following steps: a control method for generating a baseband digital carrier signal, a coding framing transmission control method for data to be transmitted and a multipath synchronous transmission control method for signals;
the control device for tracking and signaling based on time synchronization comprises a clock driving module, a time acquisition module, a carrier frequency generation module, a carrier frequency control module, a baseband data coding module, a high-frequency modulation and channel segmentation module, a display control module, a BD/GPS time service receiving module and a line signal transmitting module.
The technical scheme of the method is characterized in that local time data is generated at a transmitting end, standard Beijing time data is acquired from a BD/GPS time service receiving module, and then the current local time data is continuously refreshed by using the standard Beijing time data, so that standard control time of which the local time is completely synchronous with the Beijing time is obtained. On the other hand, m (m=1, 2, 3, …) carrier frequencies are generated, and are combined into n (n=1, 2, 3, …) frequency groups, each frequency group comprises j (j=1, 2, 3, …) frequencies, each frequency is numbered, and finally j frequencies are selected by using a basic time unit of standard control time, and data to be transmitted are encoded according to a contracted frame format by using the j frequencies, so as to obtain a baseband transmission signal taking h (h=1, 2, 3, …) bits of data as one frame. Because the time is continuously changed and the transmission code speed of the coded data is also continuously changed, the adversary can hardly acquire the data through the fixed code speed, and the bottom protection effect of channel encryption is achieved. Further, before the baseband data is sent to the line for transmission, the baseband data is modulated to a high frequency band to remove direct current components, and then the line channel is divided into k (k=1, 2, 3, …) wireless, FSO or optical fiber carrier frequency band channels according to time slots, so that the modulated high frequency signals are transmitted by different transmission channels in different time slots. Thus, even if the adversary detects that signal transmission exists in a certain channel, only partial incomplete data fragments can be obtained, so that the second-layer protection effect of the transmission channel is achieved;
the control method for generating the baseband digital carrier signals ensures that the digital carrier frequencies used by each time interval of two communication parties are the same, the digital carrier frequencies used by different time intervals are different, the length of the synchronous time interval can be in units of time, minutes, seconds, milliseconds and the like, and the smaller the unit is, the faster the digital carrier frequency changes, and the harder the digital carrier frequency is captured by enemy; the coding frame sending control method of the data to be transmitted ensures that the duration of each bit in the data frame is 16 times of the period of the digital carrier wave, thereby facilitating the sampling of the receiving end. Each data frame has its own independent start bit, data bit, parity check bit and stop bit, which is convenient for independent transmission and identification of each frame; the time length of the digital carrier frequency staying at one carrier frequency is longer than the time length spent by one data frame transmission, so that 1 frame of data is prevented from crossing two digital carrier frequencies; the multipath synchronous transmission control method of the signals distributes high-frequency modulation data to k different remote transmission line channels according to time slots, even if a certain remote channel is captured by an adversary, only partial fragment signals can be intercepted, complete signals can not be obtained, and the instantaneous change of baseband carrier waves is added, so that the safety of signal transmission is further improved.
Further, the control method for generating the baseband digital carrier signal further comprises the following steps:
the first step: generating local base time in the FPGA chip by using a clock signal output by the crystal oscillator, wherein the local base time comprises time such as time, minute, second, millisecond and the like, and the time is used as initial reference time for transmitting data by the system;
and a second step of: the BD/GPS time service receiving module is utilized to obtain standard Beijing time including time of time, minute, second, millisecond and the like, and the time is output to the FPAG chip to be used as calibration time;
and a third step of: refreshing the local reference time by using the calibration time of BD/GPS time service, so that the time generated by a local circuit is consistent with the standard Beijing time, and the time scales of a communication transmitting end and a receiving end are completely consistent, thereby being used as a time synchronization control signal for simultaneously controlling the selection of the digital carrier frequency by both communication parties;
fourth step: generating m different digital carrier signals in an FPGA chip by utilizing a clock signal output by a local crystal oscillator, and combining m (m=1, 2, 3, …) carrier signals into n (n=1, 2, 3, …) carrier frequency groups, wherein the number of carriers in each carrier group is j (j=1, 2, 3, …), and the carriers are numbered in sequence so as to be called according to the numbers; the carriers in each group may be different frequencies, or may be the same frequency or partially the same frequency;
fifth step: selecting control signals by using externally input carrier frequency groups, selecting specified carrier groups, and selecting frequencies specified by digital carrier numbers in the specified groups by using time synchronization control signals in an FPGA chip; because the time synchronization control signal is continuously changed, the digital carrier is also continuously changed, so that the digital carrier of both communication parties synchronously tracks and changes; .
Further, the coding framing transmission control method of the data to be transmitted further comprises the following steps:
the first step: when the data is not transmitted, the baseband data coding module sends a high-level direct current signal to indicate that the transmission line is in an idle state at present, so that the data can be transmitted;
and a second step of: when data is to be transmitted, the high level is changed into the low level, and the duration of the low level is 16 periods of time for the digital carrier signal, which is called a transmission bit, and represents the start bit of a frame of data to be transmitted;
and a third step of: starting to transmit data, wherein the duration of high level or low level of 1, 0 code data to be transmitted of each bit occupies 1 transmission bit, and the length h of each frame of data is agreed by both communication transmitting and receiving parties;
fourth step: setting an initial value of parity check bit, which can be 0 or 1, and carrying out exclusive OR operation on each bit of data transmitted by both communication parties and the initial value, wherein the result of operation on all bits of data to be transmitted is used as the parity bit of the data of the frame to be transmitted, and h (h=1, 2, 3 and …) bits of data are transmitted to obtain 1 bit of parity check bit;
fifth step: transmitting a high level signal of at least 1 transmission bit duration, indicating the end of 1 frame of data until a new frame of data starts to be transmitted; all bit signals transmitted from the beginning to the end of the data, called 1 baseband data frame, contain h data bits to be transmitted.
Further, the synchronous transmission control method of the multiplexing signal further comprises the following steps:
the first step: modulating the encoded baseband data frame by using a high-frequency carrier wave, and moving the encoded baseband data frame to the frequency of a high-frequency carrier wave signal to obtain a high-frequency modulation signal, so that the direct-current component in the baseband data frame is removed; the method is that the high level signals in the baseband data frame, including the idle signal, the 1 signal of the transmission data, the 1 signal of the parity check bit and the 1 signal of the stop bit are replaced by the high frequency carrier signal, and the signal is kept unchanged when the low level bit is transmitted;
and a second step of: dividing a line transmission channel into k transmission channels according to time slots by using k channel division control signals, and enabling the modulated high-frequency signals to pass through the k transmission channels in turn according to a time division mode;
and a third step of: the signals output through the k transmission channels are modulated onto a transmission channel of a wireless, FSO or fiber-optic carrier frequency for remote transmission.
Furthermore, the clock driving module divides the frequency of the input external crystal oscillator clock to obtain a high-frequency modulation carrier signal, k line channel time slot division control signals and a display driving clock signal;
the time acquisition module extracts the current time received by the BD/GPS time service receiving module as time service time, and meanwhile, an external crystal oscillator clock generates a local time signal, and then the local time is refreshed by the time service time continuously, so that the local time is consistent with the time service time, and the standard control time for maintaining the baseband data frame rate is obtained.
Furthermore, the BD/GPS time service receiving module receives the Beijing time of the current standard downloaded by the satellite and outputs the time to the FPGA chip;
the carrier frequency generation module generates various carrier signals required by baseband data frame coding;
the carrier frequency control module selects one carrier wave which is used as a baseband data frame to be encoded in different time periods from m digital carrier wave frequencies in n carrier wave groups according to carrier wave numbers in turn under the control of the current standard time;
the baseband data coding module codes data to be transmitted according to a frame format of idle bits, start bits, data bits, parity check bits and stop bits to generate baseband data taking h bits of data as one frame.
Further, the high-frequency modulation and channel segmentation module modulates the baseband data frame to the high-frequency carrier frequency, and distributes the modulated data stream to k wireless, FSO or optical fiber carrier frequency bands in turn according to time slots;
the line signal transmitting module converts k paths of signals modulated by the high-frequency carrier waves into wireless, FSO or optical fiber signals for remote data transmission;
the display control module is used for displaying key signals in the working process of the system, so that the working condition of the system can be mastered conveniently at any time, and the display content comprises: the current time of the time synchronization control signal, the baseband carrier frequency number selected by the current time and the data currently being transmitted.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the Beijing time received by the BD/GPS time service receiving module and the local time generated by the FPGA chip can be modified into standard time, and the time controls the continuous change of the baseband carrier frequency along with the change of time, so that the code speed of the baseband data is changed continuously, the baseband data is difficult to intercept with a fixed code speed, and the channel is protected from the bottom layer; secondly, the baseband frame designed according to the special format has an independent data frame start-stop identification mark, and the transmission of each frame can be independently carried out according to the length of a defined frame; thirdly, modulating the baseband frame to high-frequency transmission, eliminating direct-current components, enabling the idle state of the baseband frame to be transmitted by using a digital carrier wave, and enabling a receiving end to obtain identification marks of a data start bit and a data end bit; fourth, adopt the time slot to choose different channels to transmit, make some long-distance transmission line channel even detected, only lose the fragment data, the enemy is difficult to obtain the complete data, thus realize the second floor of protection to the transmission channel. In addition, most of the hardware of the embodiment of the invention is realized in the FPGA chip, so that the system has high reliability, small volume and the capability of reprogramming in the system.
Drawings
Fig. 1 is a schematic diagram of a tracking signaling control method based on time synchronization in an embodiment of the present invention.
Fig. 2 is a control method for generating a baseband digital carrier signal according to a tracking signaling control method based on time synchronization in an embodiment of the present invention.
Fig. 3 is a diagram of a method for controlling transmission of encoded frames of data to be transmitted according to a tracking signaling control method based on time synchronization in an embodiment of the present invention.
Fig. 4 is a diagram of a method for controlling multipath synchronous transmission of signals included in a tracking signaling control method based on time synchronization according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a tracking signaling control device based on time synchronization according to a tracking signaling control method based on time synchronization in an embodiment of the present invention.
Fig. 6 is a schematic diagram of a circuit connection relationship of related functional modules of a tracking signaling control device integrated in an FPGA chip based on time synchronization in an embodiment of the present invention.
Fig. 7 is a schematic diagram of connection relation of k FSO line signal transmitting circuits of the tracking signaling control device based on time synchronization at the output end of the FPGA chip in the embodiment of the present invention.
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.
Referring to fig. 1-7, a tracking signaling control method and apparatus based on time synchronization are provided in this embodiment.
As shown in fig. 1, the whole control process involved in a tracking signaling control method based on time synchronization is shown, and for describing the control method in detail, the method can be thinned into: a control method for generating a baseband digital carrier signal, a coding framing transmission control method for data to be transmitted and a multipath synchronous transmission control method for signals;
fig. 2 shows a control method for generating a baseband digital carrier signal, which is included in a tracking signaling control method based on time synchronization, and includes the following steps:
the first step: generating local base time in an FPGA chip by using a clock signal output by a crystal oscillator, wherein the local base time comprises time, minutes, seconds, milliseconds and the like, and the time continuously counts the current local time according to a selected minimum time unit under clock driving, so that the current local time is used as initial reference time for transmitting data by a system;
and a second step of: the BD/GPS time service receiving module is utilized to obtain standard Beijing time bdtimr, wherein the standard Beijing time bdtimr comprises time, time of minutes, time of seconds, time of milliseconds and the like, the time can be updated several times per second, and the obtained time is output to the time acquisition module in the FPAG chip and used as calibration time;
and a third step of: the time acquisition module in the FPGA chip refreshes the local reference time by using the calibrated time of BD/GPS time service, so that the local time is consistent with the standard Beijing time, the time scale of the standard Beijing time obtained by the same method is completely consistent with the communication transmitting end no matter where the communication receiving end is located, the time is used as a time synchronization control signal time [3:0] for simultaneously controlling and selecting the same digital carrier frequency by both communication parties, and the time selected as the synchronization control signal can be hours, minutes, seconds, milliseconds and the like. The larger the time unit is selected, the easier the carrier frequencies of the two communication parties are synchronized, the smaller the time unit is, the shorter the duration of each carrier is, and the safer the channel is.
Fourth step: generating m digital carrier signals with different frequencies by using a clock driving signal output by a local crystal oscillator in a carrier frequency generating module in an FPGA chip, combining the m carrier signals into n carrier frequency groups, numbering each carrier in sequence to obtain sfn [3:0] so as to be called according to the number, wherein the number of carriers in each carrier group is j; the carriers in each group may be different frequencies, or may be the same frequency or partially the same frequency;
fifth step: the carrier frequency group input from the exterior of the FPGA chip is used for selecting control signals chsel [3:0], selecting a specified carrier group, then using synchronous control signals timetr [3:0] output by a time output module in the FPGA chip, and selecting the frequency clksp specified by the digital carrier number in the specified carrier group. Because the time synchronization control signal is continuously changed, the digital carrier clksp is also continuously changed, so that the digital carriers of both communication parties synchronously track and change. For example, if the second is the synchronization control signal time [3:0], the digital carrier frequency f0 with the number of 0 is selected and output in the 0 th second, the digital carrier frequency f9 with the number of 9 is selected and output in the 9 th second, and thus the frequency designated by the carrier frequency number is changed by 10 along with the change of the second from 0 to 9.
Fig. 3 shows a method for controlling the transmission of encoded frames of data to be transmitted, which is included in a tracking signaling control method based on time synchronization, and includes the following steps:
the first step: outputting a high-level direct-current signal at a transmitting end tx of a baseband data coding module in an idle period FPGA chip without data transmission, wherein the transmitting end tx indicates that a transmission line is in an idle state at present and can transmit data;
and a second step of: when data is to be transmitted, the transmitting end tx of the baseband data encoding module is changed from high level to low level, the duration of the low level is 16 periods of the digital carrier signal clksp, which represents the start bit of a frame of data to be transmitted, and the duration of the period is also the duration of each transmission bit;
and a third step of: starting to transmit data, wherein the duration of high level or low level of 1, 0 code data to be transmitted of each bit occupies 1 transmission bit, and the length h of the data to be transmitted of each frame is agreed by both communication sending and receiving parties;
fourth step: setting an initial value of parity check bit, which can be 0 or 1, and carrying out exclusive OR operation on each bit of data transmitted by both communication parties and the initial value, using the operated result as the parity bit of the data of the frame to transmit, and transmitting 1 bit of parity check bit by a transmitting end tx after the data in each frame are transmitted;
fifth step: transmitting a high level signal of at least 1 transmission bit duration, which indicates the end of one frame of data, and if no new data is to be transmitted, the transmitting end tx keeps high level all the time; the total length of h bits of data transmitted from the beginning to the end of the data is referred to as 1 baseband data frame;
fig. 4 shows a multi-channel synchronous transmission control method included in a tracking signaling control method based on time synchronization, which includes the following steps:
the first step: modulating the encoded baseband data frame by using a high-frequency carrier clk_10kHz in the FPGA chip and a high-frequency carrier clk_10kHz in the channel allocation module to obtain a high-frequency modulation signal, so that the high level in the baseband data frame is moved to the frequency of the high-frequency carrier signal, thereby removing the direct current component in the baseband data frame and facilitating the transmission in an external circuit;
and a second step of: a k counter is designed by utilizing a channel distribution clock clk_100Hz, then the k counter is decoded, the k signal lines with high levels are output in turn, the k signal lines are used as one input port of k two-input AND gates, the other input port of the k two-input AND gates is connected with a high-frequency modulation signal, the high-frequency modulation signal is output from the k two-input AND gates in turn according to time slots, and k paths of high-frequency modulation signal lasers 8[7:0] are obtained;
and a third step of: and modulating the signal lasers 8[7:0] output through the k transmission channels to a transmission channel with wireless, FSO or optical fiber carrier frequency for remote transmission.
Fig. 5 is a schematic diagram of a tracking signaling control device based on time synchronization according to a tracking signaling control method based on time synchronization in an embodiment of the present invention. The signaling control device comprises a clock driving module, a time acquisition module, a carrier frequency generation module, a carrier frequency control module, a baseband data coding module, a high-frequency modulation and channel segmentation module, a display control module, a BD/GPS time service receiving module and a line signal transmitting module.
The clock driving module in fig. 5 obtains a high-frequency modulation carrier signal, k line channel time slot division control signals and a display driving clock signal by dividing an input external crystal oscillator clock;
the time acquisition module in fig. 5 extracts the current time received from the BD/GPS time service receiving module as time service time, and simultaneously generates a local time signal by an external crystal oscillator clock, and then continuously refreshes the local time by using the time service time, so that the local time is consistent with the time service time, and the standard control time for maintaining the baseband data frame rate is obtained;
the BD/GPS time service receiving module in the figure 5 receives the current standard Beijing time downloaded by the satellite and outputs the time to the FPGA chip;
the carrier frequency generation module in fig. 5 generates various carrier signals required for baseband data frame encoding;
the carrier frequency control module in fig. 5 selects one carrier wave as the baseband data frame code in different time periods according to the carrier wave number in turn from j digital carrier wave frequencies of n carrier wave groups under the control of the current standard time;
the baseband data encoding module in fig. 5 encodes data to be transmitted in a frame format of idle bits, start bits, data bits, parity check bits, and stop bits to generate a baseband data transmission signal with h bits of data as one frame;
the high frequency modulation and channel splitting module in fig. 5 modulates a baseband data frame onto a high frequency carrier frequency, and alternately distributes the modulated data stream onto k wireless, FSO or fiber carrier frequency bands according to time slots;
the line signal transmitting module in fig. 5 converts k paths of signals modulated by the high-frequency carrier wave into wireless, FSO or optical fiber signals for remote data transmission;
the display control module in fig. 5 is used for displaying key signals in the working process of the system, so as to facilitate grasping the working condition of the system at any time, and the display contents include: the current time of the time synchronization control signal, the baseband carrier frequency number selected by the current time and the data currently being transmitted.
Fig. 6 is a schematic diagram of a circuit connection relationship of related functional modules designed by integrating a tracking signaling control device based on time synchronization in an FPGA chip according to an embodiment of the present invention.
In FIG. 6, the standard time dtimrx output by the BD/GPS time service receiving module is serially input into the u2 time acquisition module, and after synchronizing with the local time generated by clk in the module, the time synchronization control signal timctr [3:0] is output in parallel; rst is a system reset signal;
in FIG. 6, the u1 carrier frequency generation module divides the input clk clock to obtain 10 carrier frequency signals fn [9:0];
in fig. 6, the u3 carrier control module selects one carrier group from n groups of carriers according to an externally input frequency group selection signal chsel [3:0] under the excitation of a clock clk and a reset signal rst, and selects 1 carrier from 10 carrier frequencies fn [9:0] to be alternately output as a carrier modulation signal clksp for baseband data according to the time change speed of a time synchronization control signal timetr [3:0]; meanwhile, the actual frequency number of the current carrier modulation signal clksp is output to a display circuit for display.
In fig. 6, the u4 baseband data encoding module excites the externally input 8-bit data to be transmitted [7:0], and forms the data to be transmitted [7:0] into a baseband data frame to be output from tx under the excitation of the carrier modulation signal clksp, the reset signal rst and the external transmission enabling signal txen of the baseband data.
In fig. 6, the u0 clock driving module generates a clock clk_1khz required by the display module, a high-frequency carrier signal clk_10khz required by high-frequency modulation, and a time slot control signal clk_100Hz required by channel division.
In fig. 6, the u5 high-frequency modulation and channel division module generates 8 external line transmission channels which are conducted in turn by using a channel division control signal clk_100Hz, modulates a baseband data frame onto a high-frequency carrier frequency band by using a high-frequency carrier signal clk_10khz, and finally outputs signals laser8[7:0] from 8 output channels in turn according to time slots.
In fig. 6, the u6 four-bit seven-segment display module compiles the input current period baseband code carrier frequency number sfn [3:0], the current time tim [3:0], the current transmission data datain [3:0] into a driving signal Tub4[3:0], sec7[6:0] for driving seven segments of the 4-bit nixie tube to display.
Fig. 7 is a schematic diagram of connection relation of 8 FSO line signal transmitting circuits of the tracking and signaling control device based on time synchronization at the output end of the FPGA chip in the embodiment of the present invention. The 8 line signals laser8[7:0] output by the FPGA are respectively input to the input ends laser 0-laser 7 of the laser modulation circuit, and modulated lasers carrying high-frequency modulation signals are output from the led 0-led 7 laser emission tubes after being driven by the driving tubes Q0-Q7. In fig. 7, R is a base and collector current limiting resistor, and D is a protection diode.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.
Claims (4)
1. A tracking and signaling control method based on time synchronization is characterized in that: the control device comprises a clock driving module, a time acquisition module, a carrier frequency generation module, a carrier frequency control module, a baseband data coding module, a high-frequency modulation and channel segmentation module, a display control module, a BD/GPS time service receiving module and a line signal transmitting module;
when the control device based on time synchronization tracking signaling is used for control, the control method comprises a control method for generating a baseband digital carrier signal, a coding framing transmission control method for data to be transmitted and a synchronous transmission control method for multiplexing signals;
the control method for the generation of the baseband digital carrier signal further comprises the following steps:
the first step: generating local base time in the FPGA chip by using a clock signal output by the crystal oscillator, wherein the local base time comprises time such as time, minute, second, millisecond and the like, and the time is used as initial reference time for transmitting data by the system;
and a second step of: the BD/GPS time service receiving module is utilized to obtain standard Beijing time including time of time, minute, second, millisecond and the like, and the time is output to the FPAG chip to be used as calibration time;
and a third step of: refreshing the local reference time by using the calibration time of BD/GPS time service, so that the time generated by a local circuit is consistent with the standard Beijing time, and the time scales of a communication transmitting end and a receiving end are completely consistent, thereby being used as a time synchronization control signal for simultaneously controlling the selection of the digital carrier frequency by both communication parties;
fourth step: generating m different digital carrier signals in an FPGA chip by utilizing a clock signal output by a local crystal oscillator, and combining m (m=1, 2, 3, …) carrier signals into n (n=1, 2, 3, …) carrier frequency groups, wherein the number of carriers in each carrier group is j (j=1, 2, 3, …), and the carriers are numbered in sequence so as to be called according to the numbers; the carriers in each group may be different frequencies, or may be the same frequency or partially the same frequency;
fifth step: selecting control signals by using externally input carrier frequency groups, selecting specified carrier groups, and selecting frequencies specified by digital carrier numbers in the specified groups by using time synchronization control signals in an FPGA chip; because the time synchronization control signal is continuously changed, the digital carrier is also continuously changed, so that the digital carrier of both communication parties synchronously tracks and changes;
the coding framing transmission control method of the data to be transmitted comprises the following steps:
the first step: when the data is not transmitted, the baseband data coding module sends a high-level direct current signal to indicate that the transmission line is in an idle state at present, so that the data can be transmitted;
and a second step of: when data is to be transmitted, the high level is changed into the low level, and the duration of the low level is 16 periods of time for the digital carrier signal, which is called a transmission bit, and represents the start bit of a frame of data to be transmitted;
and a third step of: starting to transmit data, wherein the duration of high level or low level of 1, 0 code data to be transmitted of each bit occupies 1 transmission bit, and the length h of each frame of data is agreed by both communication transmitting and receiving parties;
fourth step: setting an initial value of parity check bit, which can be 0 or 1, and carrying out exclusive OR operation on each bit of data transmitted by both communication parties and the initial value, wherein the result of operation on all bits of data to be transmitted is used as the parity bit of the data of the frame to be transmitted, and h (h=1, 2, 3 and …) bits of data are transmitted to obtain 1 bit of parity check bit;
fifth step: transmitting a high level signal of at least 1 transmission bit duration, indicating the end of 1 frame of data until a new frame of data starts to be transmitted; all bit signals transmitted from the beginning to the end of data are called 1 baseband data frame, and h data bits to be transmitted are contained in the data frame;
the synchronous transmission control method of the multipath transmission signal comprises the following steps:
the first step: modulating the encoded baseband data frame by using a high-frequency carrier wave, and moving the encoded baseband data frame to the frequency of a high-frequency carrier wave signal to obtain a high-frequency modulation signal, so that the direct-current component in the baseband data frame is removed; the method is that the high level signals in the baseband data frame, including the idle signal, the 1 signal of the transmission data, the 1 signal of the parity check bit and the 1 signal of the stop bit are replaced by the high frequency carrier signal, and the signal is kept unchanged when the low level bit is transmitted;
and a second step of: dividing a line transmission channel into k transmission channels according to time slots by using k channel division control signals, and enabling the modulated high-frequency signals to pass through the k transmission channels in turn according to a time division mode;
and a third step of: the signals output through the k transmission channels are modulated onto a transmission channel of a wireless, FSO or fiber-optic carrier frequency for remote transmission.
2. The method for controlling tracking signaling based on time synchronization according to claim 1, wherein: the clock driving module divides the frequency of the input external crystal oscillator clock to obtain a high-frequency modulation carrier signal, k line channel time slot division control signals and a display driving clock signal;
the time acquisition module extracts the current time received by the BD/GPS time service receiving module as time service time, and meanwhile, an external crystal oscillator clock generates a local time signal, and then the local time is refreshed by the time service time continuously, so that the local time is consistent with the time service time, and the standard control time for maintaining the baseband data frame rate is obtained.
3. The method for controlling tracking signaling based on time synchronization according to claim 2, wherein: the BD/GPS time service receiving module receives the current standard Beijing time downloaded by the satellite and outputs the time to the FPGA chip;
the carrier frequency generation module generates various carrier signals required by baseband data frame coding;
the carrier frequency control module selects one carrier wave which is used as a baseband data frame to be encoded in different time periods from m digital carrier wave frequencies in n carrier wave groups according to carrier wave numbers in turn under the control of the current standard time;
the baseband data coding module codes data to be transmitted according to a frame format of idle bits, start bits, data bits, parity check bits and stop bits to generate baseband data taking h bits of data as one frame.
4. A method for controlling a time synchronization based tracking signaling according to claim 3, wherein: the high-frequency modulation and channel segmentation module modulates a baseband data frame to a high-frequency carrier frequency, and distributes the modulated data stream to k wireless, FSO or optical fiber carrier frequency bands in turn according to time slots;
the line signal transmitting module converts k paths of signals modulated by the high-frequency carrier waves into wireless, FSO or optical fiber signals for remote data transmission;
the display control module is used for displaying key signals in the working process of the system, so that the working condition of the system can be mastered conveniently at any time, and the display content comprises: the current time of the time synchronization control signal, the baseband carrier frequency number selected by the current time and the data currently being transmitted.
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