CN109495420B - Digital channel machine with CSBK transmission function - Google Patents
Digital channel machine with CSBK transmission function Download PDFInfo
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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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
The invention provides a digital channel machine with CSBK transmission function, comprising a user interface unit, a signaling control unit, a baseband modulation-demodulation unit, an FFSK modulation-demodulation unit and a radio frequency transceiver unit, wherein the user interface unit is electrically and communicatively connected with the signaling control unit; the signaling control unit is electrically and communicatively connected with the baseband modem unit and the FFSK modem unit, the FFSK modem unit is electrically and communicatively connected with the baseband modem unit, and the baseband modem unit is electrically and communicatively connected with the radio frequency transceiver unit. The invention realizes the modulation and demodulation functions of CSBK data and 4FSK signals by adopting a signaling control circuit and a baseband modulation and demodulation circuit based on high-speed CSBK communication, and realizes the digital transmission of column tail data; based on FFSK modulation-demodulation technology, analog communication of column mantissa data is realized, and smooth transition from analog to digital of column mantissa data communication is realized.
Description
Technical Field
The invention relates to the field of digital channel machines, in particular to a digital channel machine with a CSBK transmission function.
Background
At present, the wireless transmission of train tail information of a truck is generally carried out by adopting a 450MHz frequency band simulation mode, but the country stops model approval of simulation interphone equipment in the 150MHz 400MHz frequency band, and the digital interphone is comprehensively promoted. The wireless transmission of truck train tail information should be gradually updated from an analog system to a 400MHz digital system. Therefore, it has been a trend to adopt 400MHz digital mode to carry out train tail communication, in order to improve the reliability of data transmission and communication efficiency, a CSBK digital channel machine technical scheme is provided, and the existing 450MHz analog train tail communication is compatible, so as to ensure the normal use of train tail.
Disclosure of Invention
In order to solve the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a digital channel machine with CSBK transmitting function, so as to overcome the shortcomings of the prior art.
In order to achieve the above object, the present invention provides a digital channel machine having a CSBK transmission function, the digital channel machine including a user interface unit, a signaling control unit, a baseband modem unit, an FFSK modem unit, a radio frequency transceiver unit, and a power supply unit; the power supply unit is electrically connected with the user interface unit, and the user interface unit is electrically connected with the signaling control unit and in communication connection; the user interface unit is used for bidirectionally transmitting the train tail data and the train tail signaling between the train tail equipment main control unit and the signaling control unit; the signaling control unit is electrically and communicatively connected with the baseband modulation and demodulation unit, and the baseband modulation and demodulation unit is electrically and communicatively connected with the radio frequency transceiver unit; the signaling control unit is used for modulating and demodulating the CSBK of the column tail data and sending the CSBK data to the baseband modulation and demodulation unit, the signaling control unit adopts an STM32 chip microprocessor, and the STM32 chip microprocessor is used for sending channel control and double-time-slot timing control information and the CSBK data to the interleaver for data processing according to a CSBK communication protocol and then sending the channel control and double-time-slot timing control information to the baseband modulation and demodulation unit for baseband modulation so as to realize channel control and double-time-slot timing control when the CSBK data is sent; the baseband modulation and demodulation unit is used for modulating and demodulating a 4FSK signal of CSBK data, modulating the modulated 4FSK signal onto a carrier frequency signal or transmitting the demodulated CSBK data to the signaling control unit, the baseband modulation and demodulation unit adopts an OMAP L138 microprocessor, the baseband modulation and demodulation unit is used for controlling current returned by the voltage-controlled oscillator to modulate carrier frequency so as to realize a channel control function, and the baseband modulation and demodulation unit is also used for detecting the PTT level of the user interface unit so as to realize the starting of a channel machine transmitting function; the system is used for detecting the level change of the carrier monitoring end so as to realize the function of informing the main control unit of the tail equipment of receiving effective carrier signals; the radio frequency transceiver unit is used for transmitting or receiving carrier frequency signals so as to realize train tail data transmission in a digital working mode; the signaling control unit is electrically and communicatively connected with the FFSK modem unit, the FFSK modem unit is electrically and communicatively connected with the baseband modem unit, and the baseband modem unit is electrically and communicatively connected with the radio frequency transceiver unit; the signaling control unit is used for sending the FFSK data to the FFSK modulation and demodulation unit, the FFSK modulation and demodulation unit is used for modulating and demodulating the FFSK signal of the FFSK data, and sending the modulated FFSK signal to the baseband modulation and demodulation unit or sending the demodulated FFSK data to the signaling control unit, and the FFSK modulation and demodulation unit adopts a CMX469 chip; the baseband modulation and demodulation unit is used for modulating the modulated FFSK signal onto a carrier frequency signal or transmitting the demodulated FFSK signal to the FFSK modulation and demodulation unit, and the radio frequency receiving and transmitting unit is used for transmitting or receiving the carrier frequency signal so as to realize column tail data transmission in an analog working mode.
Through the technical scheme, under a digital working mode, based on high-speed CSBK communication, a mode of a signaling control circuit and a baseband modulation-demodulation circuit is adopted to realize the modulation-demodulation of CSBK data and the modulation-demodulation function of 4FSK signals, and the digital transmission of column tail data is realized. In an analog working mode, based on an FFSK modulation-demodulation technology, analog communication of column tail data is realized, and smooth transition from analog to digital of the column tail data communication is realized.
As a further explanation of the digital channel machine according to the present invention, preferably, the user interface unit includes a reset signal control end, and the tail-row device main control unit is electrically and communicatively connected to the baseband modem unit through the reset signal control end, so as to control the digital channel machine to restart.
Through the technical scheme, the baseband modulation and demodulation unit can be controlled by the reset signal control end to control the digital channel machine to restart.
As a further explanation of the digital channel machine according to the present invention, preferably, the user interface unit includes a PTT signal control terminal, and the tail-row device main control unit is electrically and communicatively connected to the baseband modem unit through the PTT signal control terminal, so as to control whether the digital channel machine transmits.
Through the technical scheme, the PTT signal control terminal can control the signal transmission between the baseband modulation demodulation unit and the radio frequency receiving and transmitting unit, and further control whether the digital channel machine transmits or not.
As a further explanation of the digital channel machine according to the present invention, preferably, the user interface unit includes a carrier monitor terminal, and the main control unit of the tail device is electrically and communicatively connected to the baseband modem unit through the carrier monitor terminal, so as to inform the main control unit of whether the tail device receives a valid carrier signal.
Through the technical scheme, the carrier monitoring end detects whether the signal received by the baseband modulation and demodulation unit is an effective carrier signal or not, and then the train tail equipment main control unit can know whether the effective carrier signal is received or not.
As a further explanation of the digital channel machine according to the present invention, preferably, the user interface unit includes a UART interface and a USB interface; the train tail equipment main control unit is electrically and communicatively connected with the signaling control unit through a UART interface so as to realize transmission of train tail data and train tail signaling; the computer is electrically and communicatively connected with the USB interface, and the USB interface is electrically and communicatively connected with the baseband modulation and demodulation unit so as to realize frequency writing, working mode adjustment and software upgrading of the digital channel machine.
Through the technical scheme, the communication between the computer and the baseband modulation and demodulation unit can be realized through the USB interface.
As a further explanation of the digital channel machine according to the present invention, preferably, the user interface unit includes a power supply interface, and the host of the tail-row device is electrically connected to the power supply unit through the power supply interface to provide the dc DC7.2V working voltage to the digital channel machine; the power supply unit comprises a DC7.2V-to-DC3.3V direct-current stabilized power supply module so as to convert DC7.2V voltage into stable and reliable DC3.3V voltage.
Through the technical scheme, stable and reliable DC3.3V working voltage is provided for each unit.
As a further explanation of the digital channel machine according to the present invention, preferably, the radio frequency transceiver unit includes a transmitting circuit and a receiving circuit; the transmitting circuit comprises a radio frequency power amplifying circuit, a low-pass filter circuit and an automatic power control circuit, wherein the mixer, the radio frequency power amplifying circuit and the low-pass filter circuit are sequentially connected in series, the automatic power control circuit is connected with the radio frequency power amplifying circuit in parallel, the mixer is used for generating a carrier signal, the radio frequency power amplifying circuit is used for amplifying the carrier signal by a multi-stage amplifier, and meanwhile the automatic power control circuit automatically adjusts the transmitting power of the carrier signal, and the carrier signal is transmitted after passing through the low-pass filter circuit; the receiving circuit comprises a radio frequency band-pass filter, a low noise amplifier, an intermediate frequency filter, an intermediate frequency amplifier and an intermediate frequency processor, wherein the radio frequency band-pass filter, the low noise amplifier, a mixer, the intermediate frequency filter, the intermediate frequency amplifier and the intermediate frequency processor are sequentially connected in series.
Through the technical scheme, the modulation and demodulation of the 4FSK signal and the FFSK signal are realized, and the suppression function of out-of-band harmonic waves and spurious signals is improved.
The invention has the beneficial effects that: the digital channel machine adopts a working mode of digital-analog compatibility, thereby meeting the requirement of smooth transition from analog to digital communication; the CSBK modulation-demodulation technology and the 4FSK signal modulation-demodulation technology are adopted in the digital mode, so that high-speed column mantissa digital communication is realized, the communication efficiency is improved, and the authentication encryption technology is adopted, so that the communication safety is improved; in an analog mode, an FFSK modulation-demodulation technology is adopted to realize analog column tail data communication, and the requirement of compatible analog and digital communication is met; the high-speed digital transmission of the column tail data is realized, the communication efficiency of the data is improved, the safety of the communication is improved, and the anti-interference capability of the data transmission is improved. The invention also realizes the communication between the main control unit of the train tail equipment and the CSBK digital channel machine based on the secondary development interface of the user, realizes the functions of channel control, CSBK data receiving and transmitting, FFSK data receiving and transmitting, state parameter inquiry, parameter setting, power control and the like, realizes the communication between the computer and the CSBK digital channel machine, and realizes the functions of writing frequency, mode adjustment, software upgrading and the like.
Drawings
Fig. 1 is a schematic block diagram of a digital channel engine according to the present invention;
FIG. 2 is a schematic block diagram of a circuit of a user interface unit of the present invention;
fig. 3 is a schematic circuit diagram of a signaling control unit according to the present invention;
fig. 4 is an uplink and downlink TDMA timing diagram of a signaling control unit according to the present invention;
fig. 5 is a schematic circuit diagram of a baseband modem unit according to the present invention;
FIG. 6 is a schematic circuit diagram of an FFSK modem unit according to the invention;
fig. 7 is a schematic block diagram of a transmitting circuit of the radio frequency transceiver unit of the present invention;
fig. 8 is a schematic block diagram of a receiving circuit of the radio frequency transceiver unit of the present invention;
FIG. 9 is a schematic diagram of a CSBK column tail information single frame structure of the present invention;
fig. 10 is a schematic diagram of a BPTC coding frame format according to the present invention.
Detailed Description
For a further understanding of the structure, features, and other objects of the invention, reference should now be made in detail to the accompanying drawings of the preferred embodiments of the invention, which are illustrated in the accompanying drawings and are for purposes of illustrating the concepts of the invention and not for limiting the invention.
As shown in fig. 1, fig. 1 is a schematic block diagram of a digital channel engine according to the present invention; the digital channel machine comprises a user interface unit 1, a signaling control unit 2, a baseband modulation and demodulation unit 3, an FFSK modulation and demodulation unit 4, a radio frequency transceiver unit 5 and a power supply unit 6; the power supply unit 6 is electrically connected with the user interface unit 1, and the power supply unit 6 comprises a DC7.2V-to-dc3.3v direct-current stabilized power supply module. The user interface unit 1 is electrically and communicatively connected with the signaling control unit 2; the user interface unit 1 is used for bidirectionally transmitting the train tail data and the train tail signaling between the train tail equipment main control unit and the signaling control unit 2; based on UART serial port, the signaling control unit 2 is electrically and communicatively connected with the baseband modulation and demodulation unit 3, and based on audio input/output interface, the baseband modulation and demodulation unit 3 is electrically and communicatively connected with the radio frequency transceiver unit 5; the signaling control unit 2 is used for modulating and demodulating the CSBK of the column tail data and sending the CSBK data to the baseband modulation and demodulation unit 3, the baseband modulation and demodulation unit 3 is used for modulating and demodulating the 4FSK signal of the CSBK data and modulating the modulated 4FSK signal onto a carrier frequency signal or sending the demodulated CSBK data to the signaling control unit 2, and the radio frequency transceiver unit 5 is used for transmitting or receiving the carrier frequency signal so as to realize column tail data transmission in a digital working mode; based on the synchronous clock data transmission interface, the signaling control unit 2 is electrically and communicatively connected with the FFSK modem unit 4, based on the audio input/output interface, the FFSK modem unit 4 is electrically and communicatively connected with the baseband modem unit 3, and based on the audio input/output interface, the baseband modem unit 3 is electrically and communicatively connected with the radio frequency transceiver unit 5; the signaling control unit 2 is configured to send the FFSK data to the FFSK modem unit 4, the FFSK modem unit 4 is configured to modulate and demodulate the FFSK signal of the FFSK data, and send the modulated FFSK signal to the baseband modem unit 3 or send the demodulated FFSK data to the signaling control unit 2, the baseband modem unit 3 is configured to modulate the modulated FFSK signal on a carrier frequency signal or send the demodulated FFSK signal to the FFSK modem unit 4, and the radio frequency transceiver unit 5 is configured to transmit or receive the carrier frequency signal, so as to implement tail-in-line data transmission in the analog operation mode.
Referring to fig. 2, fig. 2 is a schematic block diagram of a user interface unit of the present invention; the user interface unit 1 comprises a power supply interface 11, a UART interface 12, a USB interface 13, a reset signal control end 14, a PTT signal control end 15 and a carrier monitoring end 16; the column tail equipment host is electrically connected with the power supply unit 6 through the power supply interface 11 so as to provide direct current DC7.2V working voltage for the digital channel machine; the train tail equipment main control unit is electrically and communicatively connected with the signaling control unit 2 through the UART interface 12 so as to realize transmission of train tail data and train tail signaling; the computer is electrically and communicatively connected with the USB interface 13, and the USB interface 13 is electrically and communicatively connected with the baseband modulation and demodulation unit 3 so as to realize the frequency writing, the working mode adjustment and the software upgrading of the digital channel machine of the computer; the main control unit of the tail equipment is electrically and communicatively connected with the baseband modulation and demodulation unit 3 through a reset signal control end 14 so as to control the digital channel machine to restart; the main control unit of the train tail equipment is electrically and communicatively connected with the baseband modulation and demodulation unit 3 through the PTT signal control end 15 so as to control whether the digital channel machine transmits or not; the main control unit of the train tail equipment is electrically and communicatively connected with the baseband modem unit 3 through the carrier monitoring end 16 so as to inform the main control unit of whether the train tail equipment receives an effective carrier signal.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a signaling control unit according to the present invention; the signaling control unit 2 adopts an STM32 chip microprocessor, the signaling control unit 2 is connected with the user interface unit 1 through a UART interface, the signaling control unit 2 is connected with the baseband modem unit 3 through a UART serial port, and the signaling control unit 2 is connected with the FFSK modem unit 4 through an I/O interface and an external interrupt interface. The CSBK modulation and demodulation is realized by the STM32 chip microprocessor through data processing according to a CSBK communication protocol; and when the STM32 chip microprocessor transmits CSBK data according to a TDMA protocol, channel control and double-time-slot timing control information are transmitted to an interleaver together with the CSBK data for data processing, and then transmitted to the baseband modulation and demodulation unit 3 for baseband modulation. According to the TDMA communication protocol, a radio frequency carrier (i.e. a physical channel) is divided into two logical channels, and each of the uplink and downlink channels adopts a radio frequency channel, so that the uplink and downlink channels respectively have two logical channels, namely, an instant 1 and a time slot 2, and the signaling control unit STM32 chip microprocessor performs channel timing allocation according to the interval time specified by the TDMA protocol, so that CSBK data is allocated to the time slot 1 or the time slot 2, and the uplink and downlink TDMA time sequence is shown in fig. 4.
The signaling control unit 2 is based on ARM high-speed data processing capability, adopts an STM32 series chip processor with an ARM Cortex-M3 kernel with high performance, low power consumption and low cost, loads a Linux operating system on the STM32 chip, realizes channel control and communication data processing of a digital channel machine, and realizes CSBK data processing based on a data processing program of the Linux operating system; TDMA data processing; an interleaver data processing; and processing interface data such as serial ports and external interrupts.
Based on the UART serial data interface, the main control unit of the train tail communication equipment is in data and signaling communication with the digital channel machine, and the functions of CSBK data transceiving, FFSK data transceiving, channel control, parameter inquiry, parameter setting and the like are realized. UART serial communication adopts a standard asynchronous serial communication protocol, the data format is composed of 10 bits of data per byte, namely 1-bit start bit, 8-bit data bit and 1-bit stop bit, and the communication rate is 38400 bits/s.
And an AT instruction set is adopted to realize the data and signaling interactive communication function of the main control unit of the train tail equipment and the digital channel machine. An AT instruction consists of an "AT" + function name + data or command content + end character. Based on the function name of the AT instruction, distinguishing the column tail data is realized by adopting digital mode transmission or analog mode transmission. For example: and transmitting the column tail data in a digital mode, wherein the communication data frame format is AT+CSBK+data+end characters, and transmitting the column tail data in an analog mode, and the communication data frame format is AT+FFSK+data+end characters.
Based on high-speed reliable CSBK data communication, digital mode transmission of column tail communication data is realized. The signaling control unit performs CSBK modulation and demodulation on the column tail data, and the single frame structure of the CSBK column tail information is shown in fig. 9, and the single frame CSBK message length is 96 bits. The CSBK single-frame message structure consists of a data block (LB), a protection mark (PF), a control signaling block operation Code (CSBKO), a function set identifier (FID), 8 bytes of data and a CSBK CRC check code, and ensures the effective transceiving of the data and the correctness of the transceiving data.
When CSBK data is transmitted, BPTC coding is needed, information such as FEC error correction verification, data encryption and the like is added, data protection and encryption functions are achieved, as shown in FIG. 10, FIG. 10 is a schematic diagram of a BPTC coding frame format, control information such as frame synchronization, time slot types and the like is added after an interleaver, and a control logic channel transmission function is achieved. When the CSBK data is received, decryption and FEC error correction verification are needed to demodulate the CSBK data.
The adoption of the TDMA time division multiple access communication technology brings great flexibility for the management and allocation of channel resources, improves the channel capacity, improves the anti-interference capability of equipment and improves the communication quality. The high-speed CSBK encoding and decoding are combined with the rapid 4FSK modulation and demodulation technology, so that the high-speed digital transmission of column tail data is realized, the communication efficiency of the data is improved, the communication safety is improved, and the anti-interference capability of the data transmission is improved.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of a baseband modem unit according to the present invention; the baseband modulation and demodulation unit 3 adopts an OMAP L138 microprocessor, a digital-to-analog and analog-to-digital conversion subunit and a carrier signal modulation and demodulation subunit are built in, the baseband modulation and demodulation unit 3 is connected with the FFSK modulation and demodulation unit 4 and the radio frequency transceiver unit 5 through an audio input and output interface, the baseband modulation and demodulation unit 3 is connected with the signaling control unit 2 through a serial data interface, the baseband modulation and demodulation unit 3 is connected with the user interface unit 1 through a USB interface, PTT and carrier detection, the OMAP L138 is a DSP+ARM9 dual-core microprocessor with extremely low power consumption, the main frequency is 456MHz, the 256MByte industrial-level DDR2 and 512MHz NANDFlash,DSP are contained to support high-speed audio signal analog-to-digital conversion, the L138 microprocessor is used for supporting an efficient Linux operating system, and is mainly applied to a data acquisition and processing system, communication equipment, audio and video data processing and the like, and the following functions can be realized: modulating the CSBK data into a 4FSK signal; demodulating the 4FSK signal into CSBK data; adjusting the frequency of the 400M carrier signal to realize channel control; the functions of channel switching, carrier detection, PTT control and transmission and the like are realized.
Modulating a 4FSK signal or an FFSK signal on a carrier signal and transmitting the carrier signal to a radio frequency transceiver unit when data is transmitted, demodulating the 4FSK signal or the FFSK signal in the carrier signal when the data is received, demodulating the 4FSK signal, transmitting the data to a signaling control unit, and transmitting the FFSK signal to an FFSK modulation demodulation unit for demodulation; specifically, when the signaling control unit 2 sends a CSBK digital frame signal, the CSBK signal is sent to the baseband modulation and demodulation unit 3, after being subjected to data processing by the baseband modulation and demodulation unit 3, the CSBK data is modulated into a 4FSK signal, the baseband modulation and demodulation unit 3 carries out digital-to-analog conversion on the 4FSK signal, modulates the converted 4FSK signal onto a carrier signal, and then sends the carrier signal to the radio frequency transceiver unit 5 for transmission; on the contrary, the carrier signal received by the radio frequency transceiver unit 5 is demodulated by the carrier signal of the baseband modem unit 3 to obtain a 4FSK signal, and after analog-digital conversion by the baseband modem unit 3, the signal is digitally processed to demodulate CSBK data, and then the CSBK data is sent to the signaling control unit 2 for analysis. The FFSK modem unit 4 sends FFSK signals to the baseband modem unit 3, the baseband modem unit 3 modulates the FFSK signals onto carrier signals and sends the carrier signals to the radio frequency transceiver unit 5 for transmission, otherwise, carrier signals received by the radio frequency transceiver unit 5 are demodulated by the baseband modem unit 3 to obtain FFSK signals, and the FFSK signals are sent to the FFSK modem unit 4 for analog train tail data demodulation. The baseband modulation and demodulation unit 3 also realizes modulation of carrier frequency by controlling current returned by the voltage-controlled oscillator, and realizes a channel control function. By detecting the PTT level of the user interface, the channel transmitter transmission function is enabled. The successful demodulation of the carrier signal changes the level of the carrier detection end, and the effect of informing the main control unit of the tail equipment of receiving the effective carrier signal is realized.
Referring to fig. 6, fig. 6 is a schematic circuit diagram of an FFSK modem unit according to the present invention; the FFSK modem unit 4 adopts a CMX469 chip, the CMX469 chip is a full duplex FFSK (fast frequency shift keying) modem chip, the data transmission rate adopts 1200b/S, the logic high-low level frequency is 1200Hz/1800Hz respectively, and the FFSK modem unit is a modem chip with higher frequency spectrum utilization rate, higher transmission speed and stronger anti-interference capability in the existing analog data communication chip. When transmitting the FFSK data, the signaling control unit 2 transmits the column tail data to the CMX469 chip in a serial manner, the chip performs FFSK signal conversion on each bit, the bit is "1" to be converted into a 1200Hz sine wave of one period, the bit is "0" to be converted into an 1800Hz sine wave of one period, and the converted sine wave signal is transmitted to the baseband modem unit 3, otherwise, the FFSK signal demodulated in the carrier signal is transmitted to the signaling control unit 2 after the sine wave signal is converted into a high-low level data signal through the CMX469 chip according to the chip protocol.
Based on FFSK modulation and demodulation technology, a CMX469 chip is adopted to realize FFSK modulation and demodulation function; based on the audio input/output interface, FFSK signal communication with the baseband modulation/demodulation unit is realized; based on the synchronous clock serial data communication interface, the control and data communication of the CMX469 chip by the signaling control unit are realized.
Referring to fig. 7 and 8, fig. 7 is a schematic block diagram of a transmitting circuit of the radio frequency transceiver unit according to the present invention; fig. 8 is a schematic block diagram of a receiving circuit of the rf transceiver unit of the present invention, the rf transceiver unit 5 includes a transmitting circuit and a receiving circuit; the transmitting circuit comprises a radio frequency power amplifying circuit 51, a low-pass filter circuit 52 and an automatic power control circuit 53, wherein a mixer 54, the radio frequency power amplifying circuit 51 and the low-pass filter circuit 52 are sequentially connected in series, the automatic power control circuit 53 is connected with the radio frequency power amplifying circuit 51 in parallel, the mixer is used for generating a carrier signal, the radio frequency power amplifying circuit 51 is used for amplifying the carrier signal by a multi-stage amplifier and has enough signal power, meanwhile, the automatic power control circuit 53 automatically adjusts the transmitting power of the carrier signal, the carrier signal is transmitted after passing through the low-pass filter circuit 52, and the low-pass filter can improve the suppression function of out-of-band harmonic and spurious signals under the condition that certain in-band volatility is met.
The receiving circuit includes a radio frequency band-pass filter 55, a low noise amplifier 56, an intermediate frequency filter 57, an intermediate frequency amplifier 58, and an intermediate frequency processor 59, wherein the radio frequency band-pass filter 55, the low noise amplifier 56, the mixer 54, the intermediate frequency filter 57, the intermediate frequency amplifier 58, and the intermediate frequency processor 59 are sequentially connected in series. The radio frequency band-pass filter amplifies the effective band-pass signal, filters out the out-of-band interference signal, carries out difference frequency processing on the effective signal after passing through the low noise amplifying circuit and the first local oscillator signal in the mixer to obtain a first intermediate frequency signal, carries out further suppression on the clutter signal through the intermediate frequency filter, then carries out intermediate frequency signal amplification and carries out second mixing to obtain a second intermediate frequency, and then sends the second intermediate frequency signal to the baseband modulation-demodulation unit to carry out ADC sampling, and demodulates the 4FSK signal and the FFSK signal.
The digital channel machine of the invention receives and transmits the column tail data in the digital mode into the column tail data, and the column tail data is transmitted to the signaling control unit through the UART interface. Based on CSBK modulation and demodulation, the signaling control unit packages the data and sends the data to the baseband chip; the baseband chip modulates the data into a 4FSK signal, and the 4FSK signal is modulated onto a carrier frequency signal and then transmitted through a radio frequency transceiver unit of the channel machine. Meanwhile, during the signal sending period of the channel machine, the main control unit of the train tail communication equipment controls the PTT control signal terminal, so that the digital channel machine is always in a transmitting state. On the contrary, the radio frequency transceiver unit of the CSBK digital channel machine receives the carrier frequency signal and demodulates the secondary intermediate frequency signal, the secondary intermediate frequency signal is sent to the baseband modulation and demodulation circuit after passing through the ADC circuit, the 4FSK signal is demodulated, the CSBK data is demodulated from the 4FSK signal, the demodulated CSBK data is sent to the signaling control unit, and the signaling control unit repacks the data and then sends the data to the main control unit of the tail-row equipment through the UART interface.
The digital channel machine transmits and receives analog mode train tail data into FFSK data, the FFSK data is transmitted to a signaling control unit through a UART interface, the signaling control unit transmits the FFSK data to an FFSK modulation and demodulation unit for modulation, and the modulated FFSK signal is transmitted to a baseband chip; the baseband chip modulates the signal to a carrier signal, sends the carrier signal to the radio frequency transceiver unit and sends the carrier signal through the radio frequency transceiver unit. And during the signal transmission period of the channel machine, the main control unit of the tail-row equipment controls the PTT control signal terminal to keep low level all the time, so that the digital channel machine is always in a transmitting state. The radio frequency module of the channel machine demodulates a secondary intermediate frequency signal, the secondary intermediate frequency signal is sent to the baseband modulation and demodulation circuit after passing through the ADC circuit, the baseband chip demodulates an FFSK signal, the FFSK signal is sent to the FFSK modulation and demodulation unit for demodulation, the FFSK modulation and demodulation unit sends the demodulated FFSK data to the signaling control unit, and the signaling control unit sends the FFSK data to the main control unit of the train tail equipment through the UART interface.
The signaling control unit of the invention adopts a programmable software control chip, supports program upgrading through a UART serial port, supports a user to develop richer application software to expand the functions of the channel machine, and supports functions of remote monitoring, remote software upgrading and the like based on IP. And sending a channel setting command through the UART interface, and setting the channel machine to be in a digital working mode channel or an analog working mode channel. When two channel machines are simultaneously positioned under the channels with the same frequency and the same working mode, the two channel machines can perform one-to-one communication. The special frequency transmission software of the CSBK digital channel machine enables the channel machine to enter working modes such as frequency writing, mode adjustment, firmware software upgrading and the like through a USB interface. After the CSBK digital channel machine enters a read-write frequency working mode, the ID, channel parameters and the like of the channel machine can be written in and read out. After the digital channel machine enters the mode adjustment, the analog or digital working mode of the channel machine can be set. After the CSBK digital channel machine enters a software upgrading working mode, the firmware of the channel machine can be upgraded.
It should be noted that the foregoing summary and the detailed description are intended to demonstrate practical applications of the technical solution provided by the present invention, and should not be construed as limiting the scope of the present invention. Various modifications, equivalent alterations, or improvements will occur to those skilled in the art, and are within the spirit and principles of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. A digital channel machine with a CSBK transmission function, which is characterized by comprising a user interface unit (1), a signaling control unit (2), a baseband modulation-demodulation unit (3), an FFSK modulation-demodulation unit (4), a radio frequency transceiver unit (5) and a power supply unit (6); wherein,
the power supply unit (6) is electrically connected with the user interface unit (1), and the user interface unit (1) is electrically connected with the signaling control unit (2) and in communication connection; the user interface unit (1) is used for bidirectionally transmitting the train tail data and the train tail signaling between the train tail equipment main control unit and the signaling control unit (2);
the signaling control unit (2) is electrically and communicatively connected with the baseband modulation and demodulation unit (3), and the baseband modulation and demodulation unit (3) is electrically and communicatively connected with the radio frequency transceiver unit (5); the system comprises a signaling control unit (2) and a radio frequency transceiver unit (5), wherein the signaling control unit (2) is used for modulating and demodulating CSBK (Command-based) of column tail data and sending the CSBK data to a baseband modulation and demodulation unit (3), the baseband modulation and demodulation unit (3) is used for modulating and demodulating a 4FSK signal of the CSBK data and modulating the modulated 4FSK signal onto a carrier frequency signal or sending the demodulated CSBK data to the signaling control unit (2), and the radio frequency transceiver unit (5) is used for transmitting or receiving the carrier frequency signal so as to realize column tail data transmission in a digital working mode;
the signaling control unit (2) is electrically and communicatively connected with the FFSK modem unit (4), the FFSK modem unit (4) is electrically and communicatively connected with the baseband modem unit (3), and the baseband modem unit (3) is electrically and communicatively connected with the radio frequency transceiver unit (5); the signal control unit (2) is used for sending FFSK data to the FFSK modulation demodulation unit (4), the FFSK modulation demodulation unit (4) is used for modulating and demodulating FFSK signals of the FFSK data, the modulated FFSK signals are sent to the baseband modulation demodulation unit (3) or the demodulated FFSK data are sent to the signal control unit (2), the baseband modulation demodulation unit (3) is used for modulating the modulated FFSK signals on carrier frequency signals or sending the demodulated FFSK signals to the FFSK modulation demodulation unit (4), and the radio frequency transceiver unit (5) is used for transmitting or receiving carrier frequency signals so as to realize train tail data transmission in an analog working mode.
2. A digital channel machine according to claim 1, characterized in that the user interface unit (1) comprises a reset signal control terminal (14), and the tail-row device main control unit is electrically and communicatively connected to the baseband modem unit (3) via the reset signal control terminal (14) to control the digital channel machine to perform a restarting operation.
3. The digital channel machine with CSBK transmission function according to claim 1, wherein the user interface unit (1) includes a PTT signal control terminal (15), and the tail-row device main control unit is electrically and communicatively connected to the baseband modem unit (3) through the PTT signal control terminal (15) to control whether the digital channel machine transmits.
4. The digital channel machine with CSBK transmission function according to claim 1, wherein the user interface unit (1) includes a carrier monitor (16), and the tail-equipment main control unit is electrically and communicatively connected to the baseband modem unit (3) through the carrier monitor (16) to inform the tail-equipment main control unit of whether a valid carrier signal is received.
5. The digital channel machine with CSBK transmission function according to claim 1, characterized in that the user interface unit (1) comprises a UART interface (12) and a USB interface (13); the train tail equipment main control unit is electrically and communicatively connected with the signaling control unit (2) through the UART interface (12) so as to realize transmission of train tail data and train tail signaling;
the computer is electrically and communicatively connected with the USB interface (13), and the USB interface (13) is electrically and communicatively connected with the baseband modulation and demodulation unit (3) so as to realize frequency writing, working mode adjustment and software upgrading of the digital channel machine by the computer.
6. The digital channel machine with CSBK transmission function according to claim 1, wherein the user interface unit (1) includes a power supply interface (11), and the host of the train tail device is electrically connected to the power supply unit (6) through the power supply interface (11) to provide the dc DC7.2V working voltage to the digital channel machine; the power supply unit (6) comprises a DC7.2V-to-DC3.3V direct-current stabilized power supply module so as to convert DC7.2V voltage into stable and reliable DC3.3V voltage.
7. The digital channel machine with CSBK transmission function according to claim 1, wherein the radio frequency transceiver unit (5) comprises a transmitting circuit and a receiving circuit;
the transmitting circuit comprises a radio frequency power amplifying circuit (51), a low-pass filter circuit (52) and an automatic power control circuit (53), wherein a mixer (54), the radio frequency power amplifying circuit (51) and the low-pass filter circuit (52) are sequentially connected in series, the automatic power control circuit (53) is connected with the radio frequency power amplifying circuit (51) in parallel, the mixer is used for generating a carrier signal, the radio frequency power amplifying circuit (51) is used for amplifying the carrier signal by a multistage amplifier, meanwhile, the automatic power control circuit (53) automatically adjusts the transmitting power of the carrier signal, and the carrier signal is transmitted after passing through the low-pass filter circuit (52);
the receiving circuit comprises a radio frequency band-pass filter (55), a low noise amplifier (56), an intermediate frequency filter (57), an intermediate frequency amplifier (58) and an intermediate frequency processor (59), wherein the radio frequency band-pass filter (55), the low noise amplifier (56), a mixer (54), the intermediate frequency filter (57), the intermediate frequency amplifier (58) and the intermediate frequency processor (59) are sequentially connected in series.
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| CN110504985A (en) * | 2019-09-24 | 2019-11-26 | 天津七一二通信广播股份有限公司 | A kind of train dispatch radio communication channel machine equipment and implementation method with digitized audio interface |
| CN110784847A (en) * | 2019-11-05 | 2020-02-11 | 洪杰星 | Crossing early warning device and method for decoding received early warning information |
| CN113660060A (en) * | 2021-07-29 | 2021-11-16 | 深圳市博裕纳科技有限公司 | Signal modulation and demodulation method, data transmission radio station, MCU and storage medium thereof |
| CN116418429B (en) * | 2023-06-05 | 2023-09-19 | 泉州市铁通电子设备有限公司 | Test tool and test method for railway digital train tail channel machine |
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