Short-wave channel multipath receiving system and data processing method thereof

Abstract

The invention belongs to the technical field of short-wave communication, and discloses a short-wave channel multi-channel receiving system and a data processing method thereof.The system comprises a radio frequency receiving module and a digital channel module, the short-wave multi-channel receiving and multi-channel synchronous rapid capturing technology is adopted, multiple channels can be monitored and captured at the same time, blind signal receiving in a short-wave frequency band is achieved, and the signal receiving speed is high. And a three-path short message receiving service can be realized in a fixed-frequency receiving mode. The use efficiency and flexibility of the short-wave spectrum are improved, and the short-wave communication quality is greatly improved. The use efficiency and flexibility of the short-wave spectrum are improved, and huge performance improvement potential is provided for a short-wave communication system. Compared with a traditional short-wave system in a single-channel working mode, the short-wave system can continuously listen to the whole working frequency band at the same time, multi-channel receiving is achieved, the quality and efficiency of short-wave communication are greatly improved, and the short-wave system has wide application prospects in the fields of military affairs, emergency communication and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of shortwave communication, and in particular relates to a shortwave channel multi-path receiving system and a data processing method thereof. Background Art

[0002] With the development of shortwave wireless communication technology, higher requirements have been put forward for shortwave communication quality, system portability, and anti-interference ability. In the field of shortwave communication, traditional shortwave radio stations have many problems, such as the need to scan and select the operating frequency within a wide frequency band, low efficiency, and lack of support for multi-task parallel work. At the same time, the existing shortwave receiving system has a limited number of channels, low receiving efficiency, and high power consumption. These problems seriously limit the development and application of shortwave communication and are difficult to meet actual needs. In today's new demand scenarios, the system must have the ability to capture signals from multiple channels, improve the signal reception capability under complex channel conditions, and improve communication security by optimizing spectrum utilization efficiency and flexibility.

[0003] The problems and defects of the prior art are:

[0004] a) Signal reception under complex channel conditions

[0005] Shortwave channels are highly time-varying and have poor stability. Traditional technologies have difficulty efficiently receiving multi-channel signals under such complex conditions. Shortwave communication channels are greatly affected by the ionosphere. The instability of the ionosphere causes shortwave channels to exhibit strong time-varying characteristics, which affects the quality of signal transmission and seriously restricts the reliability of shortwave communications. In existing shortwave receiving systems, there are problems such as limited number of channels, inefficient reception, and high power consumption, which make it difficult to meet actual needs. Most systems are based on traditional receiving architectures and cannot effectively monitor multiple channels at the same time, resulting in low communication efficiency. Due to the lack of efficient multi-channel parallel processing capabilities, existing systems may not be able to receive signals in a timely and comprehensive manner, resulting in the loss of important information, which greatly limits the application of shortwave communications in complex and dynamic environments.

[0006] b) Low efficiency and poor flexibility of spectrum resource utilization

[0007] Traditional shortwave radio stations need to scan and select operating frequencies in a wide frequency band, which is inefficient and does not support multi-task parallel work. Spectrum allocation is not flexible enough, and often can only use fixed frequency bands or select frequencies according to preset, limited modes, resulting in a waste of spectrum resources.

[0008] Traditional systems are usually unable to quickly adapt to the spectrum requirements of different communication tasks and environmental changes. When the communication frequency or frequency band needs to be temporarily changed, the system often requires a complex manual adjustment or reconfiguration process, which may cause communication interruption in some emergency situations, seriously affecting the reliability and stability of communication, making it difficult for shortwave communication systems to perform at their best in the complex and changing modern communication environment. Summary of the invention

[0009] In view of the problems existing in the prior art, the present invention provides a shortwave channel multi-channel receiving system and a data processing method thereof.

[0010] The present invention is achieved in that a shortwave channel multi-path receiving system comprises:

[0011] The RF receiving module and the digitized channel module are composed; the input end of the digitized channel module is connected to the output end circuit of the RF receiving module;

[0012] The radio frequency receiving module is used to receive the shortwave signal through the shortwave antenna, send the shortwave signal to the bandpass filter for filtering, send the filtered signal to the radio frequency front-end processing circuit, and the radio frequency front-end processing circuit performs front-end low-noise amplification and low-pass filtering on the signal; the processed signal is then converted into digital by the AD (Analog-to-Digital Conversion) sampling circuit, and the digital radio frequency signal generated after the analog-to-digital conversion is sent to the digital channel module;

[0013] The digital channel module is used to adopt short-wave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit according to the set scanning time interval. The radio frequency processing circuit switches the frequency of the channel according to the frequency segment specified by the frequency switching instruction;

[0014] The radio frequency receiving module includes a short wave antenna, a band pass filter, a radio frequency front end processing circuit and an AD sampling circuit;

[0015] The digital channel module includes a radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit.

[0016] Furthermore, the RF receiving module includes a shortwave antenna, a bandpass filter, a RF front-end processing circuit and an AD sampling circuit which are electrically connected in sequence; the bandpass filter is used to receive signals from the antenna and to suppress out-of-band signals from the antenna; the RF front-end processing circuit is used to perform front-end low-noise amplification and low-pass filtering on the signal; and the AD sampling circuit is used to perform analog-to-digital conversion on the filtered signal.

[0017] Further, the digital channel module includes an electrically connected radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit; the radio frequency processing circuit is bidirectionally connected to the multi-channel synchronous capture circuit through a first communication interface, is bidirectionally connected to the datagram demodulation circuit through a first communication interface, is unidirectionally connected to the multi-channel synchronous capture circuit through a second communication interface, and is unidirectionally connected to the control processing circuit through a fourth communication interface; the multi-channel synchronous capture circuit is bidirectionally connected to the signal demodulation circuit through the first communication interface; the signal demodulation circuit is unidirectionally connected to the datagram demodulation circuit through a third communication interface, is unidirectionally connected to the control processing circuit through a fourth communication interface, and is bidirectionally connected to the control processing circuit through a fifth communication interface;

[0018] The radio frequency processing circuit is used to perform down-conversion and extraction filtering on the signal after AD broadband sampling, and to send the digital baseband signal generated after the down-conversion processing to the multi-channel synchronous capture circuit for scanning and capture; the multi-channel synchronous capture circuit is used to realize the multi-channel capture function of the "start" and "end" synchronization heads;

[0019] The signal demodulation circuit is used to demodulate the digital baseband signal after synchronous capture from the multi-channel synchronous capture circuit, and send the data generated by the baseband demodulation to the control processing circuit for display or playback;

[0020] The datagram demodulation circuit is used to implement the vocoder function when the system is in a scanning state, and to demodulate the datagram service when the system is in a fixed frequency state, and to send the demodulated data to the signal demodulation circuit through the third communication interface, and the signal demodulation circuit outputs the data to the control processing circuit for display through the fifth communication interface;

[0021] The first communication interface is a multichannel buffered serial port McBSP (Multichannel Buffered Serial Port); the second communication interface is a universal parallel port UPP (Universal Parallel Port); the third communication interface is a parallel interface HPI (Host Port Interface); the fourth communication interface is a peripheral interface SPI (Serial Peripheral Interface); and the fifth communication interface is an asynchronous serial interface UART (Universal Asynchronous Receiver and Transmitter).

[0022] Furthermore, the control processing circuit is used to realize the control of the bandpass filter; the control processing circuit is used to configure the parameters of the radio frequency processing circuit and the multi-channel synchronous capture circuit; the control processing circuit is used to perform audio digital-to-analog conversion on the signal demodulated by the signal demodulation circuit and output the audio signal, which is then amplified by the audio power amplifier and output by the speaker.

[0023] Furthermore, the shortwave channel multi-channel receiving system adopts a broadband garrison and segmented scanning method, can simultaneously monitor and capture multiple parallel channels, and can realize blind reception of signals within the shortwave frequency band; the shortwave channel multi-channel receiving system divides the shortwave frequency band to form a large number of channels at specific intervals; at the same time, it can detect multiple parallel channels within a certain bandwidth and scan within the entire shortwave frequency band; the multi-channel synchronous capture circuit extracts useful service channels by capturing specific burst waveforms, and at the same time stops the frequency band scanning to complete the reception of baseband data, thereby realizing blind reception of shortwave signals within the shortwave frequency band.

[0024] Furthermore, the shortwave channel multi-channel receiving system has two working modes: full-band scanning reception and fixed-frequency reception, and can switch between the two working modes; the shortwave channel multi-channel receiving system can receive analog voice, voice-coded voice, voice text messages, data, and short message services; the full-band scanning reception mode can realize parallel reception and scanning reception of multiple signals at the same time; the fixed-frequency reception mode can realize the reception of three-channel short message services.

[0025] Another object of the present invention is to provide a data processing method for a shortwave channel multi-channel receiving system comprising:

[0026] Step 1, when the shortwave antenna of the RF receiving module receives the shortwave signal, the shortwave signal is sent to the bandpass filter for filtering, and the filtered signal is sent to the RF front-end processing circuit, and the RF front-end processing circuit performs front-end low-noise amplification and low-pass filtering on the signal; the processed signal is then converted into digital by the AD sampling circuit, and the digital RF signal generated after the analog-to-digital conversion is sent to the digital channel module;

[0027] Step 2: The digital channel module adopts shortwave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit according to the set scanning time interval. The radio frequency processing circuit switches the channel frequency according to the frequency segment specified by the frequency switching instruction.

[0028] If the multi-channel synchronous capture circuit captures a "start" synchronization header on a certain channel in a certain frequency band, the multi-channel synchronous capture circuit stops triggering the frequency switching action, and sends the data of the channel that captures the "start" synchronization header to the signal demodulation circuit through the second communication interface. At this time, the system enters the receiving state from the scanning state; in the receiving state, the multi-channel synchronous capture circuit continuously sends the channel data to the signal demodulation circuit through the second communication interface, the signal demodulation circuit demodulates the channel data in a conventional system, and sends the demodulated text or voice data to the control processing circuit through the third communication interface, and the control processing circuit performs corresponding display or playback; the multi-channel synchronous capture circuit is also capturing the "end" synchronization header while sending data to the signal demodulation circuit. If the "end" synchronization header is captured, the multi-channel synchronous capture circuit stops sending valid channel data to the signal demodulation circuit, and restarts to trigger the frequency switching action according to the set scanning time interval. At this time, the system enters the scanning state from the receiving state; during the operation of the system, it switches between the scanning state and the receiving state.

[0029] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0030] First, in the field of shortwave communication, traditional shortwave radio stations have many problems, such as the need to scan and select the operating frequency in a wide frequency band, low efficiency, and no support for multi-task parallel work. At the same time, the existing shortwave receiving system has a limited number of channels, low receiving efficiency, and high power consumption. These problems have seriously restricted the development and application of shortwave communication.

[0031] The shortwave channel multi-channel receiving system utilizes shortwave multi-channel receiving and multi-channel synchronous rapid capture technology to simultaneously monitor and capture multiple parallel channels, realize blind reception of signals within the shortwave frequency band, and realize three-way short message reception service in fixed-frequency receiving mode. It improves the efficiency and flexibility of shortwave spectrum utilization and provides huge performance improvement potential for shortwave communication systems. Compared with traditional shortwave systems with single-channel working mode, the present invention can continuously listen to the entire working frequency band at the same time, realize multi-channel reception, greatly improve the quality and efficiency of shortwave communication, and has broad application prospects in military, emergency communication and other fields.

[0032] Second, as auxiliary evidence of the inventiveness of the claims of the present invention, it is also reflected in the following important aspects:

[0033] (1) The expected benefits and commercial value of the technical solution of the present invention after transformation are:

[0034] The technical solution of the present invention is expected to bring objective benefits and commercial value after transformation, occupy an advantage in the shortwave communication market, meet the needs of different users for efficient shortwave communication, and thus obtain economic returns.

[0035] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad:

[0036] The unique architecture and advanced technology of the present invention are innovative in the industry both at home and abroad. Previous technologies could not achieve the multi-channel signal reception and processing in the shortwave frequency band as efficiently as the present invention. For example, in the field of international shortwave communication technology research, there has been a lack of a system that can simultaneously meet multiple business needs, efficiently receive multi-channel signals, and adapt to complex channel conditions. The emergence of the present invention fills this gap and provides a new direction and idea for the development of shortwave communication technology.

[0037] a) System architecture innovation

[0038] The present invention proposes a shortwave channel multi-channel receiving system, which is composed of a radio frequency receiving module and a digital channel module. The radio frequency receiving module includes a shortwave antenna, a bandpass filter, a radio frequency front-end processing circuit and an AD sampling circuit, and is used to receive and preliminarily process shortwave signals. The digital channel module includes a radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit, and adopts shortwave multi-channel receiving and multi-channel synchronous rapid capture technology to achieve efficient processing of multi-channel signals.

[0039] For example, in a military communication scenario, it is necessary to simultaneously receive multiple shortwave signals of different frequencies. Traditional systems may require multiple radio stations to receive them separately, but the system of the present invention can simultaneously monitor and capture multiple parallel channels through its unique architecture, achieving blind reception of signals within the shortwave frequency band, greatly improving the efficiency and comprehensiveness of signal reception.

[0040] b) Efficient signal capture and processing

[0041] Multi-channel synchronous capture technology: The multi-channel synchronous capture circuit sends a frequency switching instruction to the RF processing circuit through the edge trigger control processing circuit according to the set scanning time interval, so as to realize fast switching and signal capture of different channels. In this process, each channel will be monitored to determine whether the "starting" synchronization header is captured. In practical applications, such as in a complex electromagnetic environment, there are multiple interference sources and multiple signals that need to be received. This technology can quickly and accurately switch channels, lock the target signal, avoid interference, and improve the quality of signal reception.

[0042] c) Comprehensive signal demodulation capabilities

[0043] When the multi-channel synchronization capture circuit captures the "start" synchronization header, it stops triggering the frequency switching action, sends the channel data that captures the "start" synchronization header to the signal demodulation circuit, and the system enters the receiving state. The system can demodulate the captured signal, such as demodulating analog speech, voice coding speech and other signals, to meet a variety of business needs, whether it is voice communication or data transmission, it can effectively handle it. For example, in military exercises, it may be necessary to transmit text instructions (datagram service) and voice communication (conventional system signal), and this system can accurately demodulate and output the corresponding information.

[0044] d) Flexible system control and adaptability

[0045] Channel switching and rescanning mechanism: When the multi-channel synchronous capture circuit captures the "end" synchronization header, it stops sending valid channel data to the signal demodulation circuit, restarts the triggering of frequency switching, and the system enters the scanning state to continue monitoring and capturing other channels. The system can flexibly adjust the working mode according to the actual situation to adapt to different communication environments and needs.

[0046] e) Effective resource utilization and integration

[0047] Optimized processing of received signals: From the initial processing of signal reception, through a series of operations such as filtering, amplification, analog-to-digital conversion, to subsequent demodulation and control processing, the entire process effectively integrates and optimizes the signal, improving the overall performance of the system and resource utilization efficiency.

[0048] (3) Whether the technical solution of the present invention solves the technical problems that people have been eager to solve but have not been able to solve successfully:

[0049] Efficiently receiving multi-channel signals under complex channel conditions has always been a difficult problem in the field of shortwave communication. The present invention solves this problem by using shortwave multi-channel reception and multi-channel synchronous rapid capture technology. Shortwave communication is affected by the ionosphere and the channel is unstable. Through its technical advantages, this system can accurately receive multi-channel signals under such complex conditions to ensure smooth communication. At the same time, it is also a challenge to achieve efficient transmission and reception of multi-channel signals within limited spectrum resources. The present invention solves the problem of limited spectrum resources by improving the efficiency and flexibility of spectrum use, so that limited spectrum resources can be more fully utilized.

[0050] a) Multi-channel monitoring and signal blind reception

[0051] It can monitor and capture multiple channels at the same time, and realize blind reception of signals within the shortwave frequency band. This means that the system can receive and process multiple signals within the shortwave frequency band without knowing the specific frequency of the signal in advance, which greatly improves the comprehensiveness and flexibility of signal reception.

[0052] b) Service implementation in fixed frequency mode

[0053] In the fixed-frequency receiving mode, three-way short message receiving service can be realized, which meets specific business needs and broadens the application scope of shortwave communication systems.

[0054] c) Improved spectrum efficiency

[0055] Advantages of multi-channel monitoring: Due to the limitations of channel selection and monitoring, traditional shortwave systems can only use part of the frequency band for effective communication and cannot make full use of spectrum resources. The present invention adopts shortwave multi-channel receiving technology, which can monitor multiple channels at the same time, and can better utilize the idle frequency bands in the spectrum, thereby improving the efficiency of spectrum use.

[0056] d) Improved spectrum flexibility

[0057] Flexible channel configuration: The system can flexibly adjust the channel configuration according to actual needs. For example, in certain time periods, it is necessary to focus on monitoring signals of certain specific frequencies. The present invention can quickly allocate resources to the channels corresponding to these frequencies. Traditional systems may need to readjust parameters such as the frequency scanning range, which is less flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a structural block diagram of a shortwave channel multi-channel receiving system provided by an embodiment of the present invention.

[0059] Figure 2 The present invention is a flowchart of a data processing method for a shortwave channel multi-channel receiving system provided by an embodiment of the present invention.

[0060] Figure 3 It is a diagram of the digital processing process of the shortwave channel multi-channel receiving system provided by an embodiment of the present invention.

[0061] Figure 4 This is a frequency characteristic diagram of a key filter of a shortwave channel multi-path receiving system provided by an embodiment of the present invention.

[0062] Figure 5 It is a structural diagram of a channelized mathematical model of a polyphase filter bank of a shortwave channel multi-path receiving system provided by an embodiment of the present invention.

[0063] Figure 6 It is a schematic diagram of a synchronous acquisition algorithm based on sliding correlation FFT of a shortwave channel multi-path receiving system provided by an embodiment of the present invention.

[0064] Figure 7 It is a diagram of a multiplexed 360-channel synchronous capture implementation scheme of a shortwave channel multi-channel receiving system provided by an embodiment of the present invention.

[0065] Figure 1In: 1. RF receiving module; 2. Digital channel module. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0067] like Figure 1 As shown, a shortwave channel multi-channel receiving system provided by an embodiment of the present invention includes:

[0068] The RF receiving module 1 and the digital channel module 2 are composed; the input end of the digital channel module 2 is connected to the output end circuit of the RF receiving module 1;

[0069] The radio frequency receiving module 1 is used to receive a shortwave signal through a shortwave antenna, send the shortwave signal to a bandpass filter for filtering, send the filtered signal to a radio frequency front-end processing circuit, and perform front-end low-noise amplification and low-pass filtering on the signal; the processed signal is then converted to digital by an AD sampling circuit, and the digital radio frequency signal generated after the analog-to-digital conversion is sent to a digital channel module 2;

[0070] The digital channel module 2 is used to adopt short-wave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit according to the set scanning time interval. The radio frequency processing circuit switches the frequency of the channel according to the frequency segment specified by the frequency switching instruction;

[0071] The radio frequency receiving module 1 includes a short wave antenna, a band pass filter, a radio frequency front end processing circuit and an AD sampling circuit;

[0072] The digital channel module 2 includes a radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit.

[0073] The radio frequency receiving module 1 provided in an embodiment of the present invention includes a shortwave antenna, a bandpass filter, a radio frequency front-end processing circuit and an AD sampling circuit which are electrically connected in sequence; the bandpass filter is used to receive a signal from the antenna and to suppress the signal from the antenna out of band; the radio frequency front-end processing circuit is used to perform front-end low-noise amplification and low-pass filtering on the signal; the AD sampling circuit is used to perform analog-to-digital conversion on the signal after filtering.

[0074] The digitized channel module 2 provided in the embodiment of the present invention comprises an electrically connected radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit; the radio frequency processing circuit is bidirectionally connected to the multi-channel synchronous capture circuit through a first communication interface, is bidirectionally connected to the datagram demodulation circuit through a first communication interface, is unidirectionally connected to the multi-channel synchronous capture circuit through a second communication interface, and is unidirectionally connected to the control processing circuit through a fourth communication interface; the multi-channel synchronous capture circuit is bidirectionally connected to the signal demodulation circuit through the first communication interface; the signal demodulation circuit is unidirectionally connected to the datagram demodulation circuit through a third communication interface, is unidirectionally connected to the control processing circuit through a fourth communication interface, and is bidirectionally connected to the control processing circuit through a fifth communication interface;

[0075] The radio frequency processing circuit is used to perform down-conversion and extraction filtering on the signal after AD broadband sampling, and to send the digital baseband signal generated after the down-conversion processing to the multi-channel synchronous capture circuit for scanning and capture; the multi-channel synchronous capture circuit is used to realize the multi-channel capture function of the "start" and "end" synchronization heads;

[0076] The signal demodulation circuit is used to demodulate the digital baseband signal after synchronous capture from the multi-channel synchronous capture circuit, and send the data generated by the baseband demodulation to the control processing circuit for display or playback;

[0077] The datagram demodulation circuit is used to implement the vocoder function when the system is in a scanning state, and to demodulate the datagram service when the system is in a fixed frequency state, and to send the demodulated data to the signal demodulation circuit through the third communication interface, and the signal demodulation circuit outputs the data to the control processing circuit for display through the fifth communication interface;

[0078] The first communication interface is a multi-channel buffered serial port McBSP; the second communication interface is a universal parallel port UPP; the third communication interface is a parallel interface HPI; the fourth communication interface is a peripheral interface SPI; and the fifth communication interface is an asynchronous serial interface UART.

[0079] The control processing circuit provided in the embodiment of the present invention is used to realize the control of the bandpass filter; the control processing circuit is used to configure the parameters of the radio frequency processing circuit and the multi-channel synchronous capture circuit; the control processing circuit is used to perform audio digital-to-analog conversion on the signal demodulated by the signal demodulation circuit and output the audio signal, which is then amplified by the audio power amplifier and output by the speaker.

[0080] The shortwave channel multi-channel receiving system provided by the embodiment of the present invention adopts a broadband garrison and segmented scanning mode, can monitor and capture multiple parallel channels at the same time, and can realize blind reception of signals within the shortwave frequency band; the shortwave channel multi-channel receiving system divides the shortwave frequency band to form a large number of channels at specific intervals; at the same time, it can detect multiple parallel channels within a certain bandwidth and scan within the entire shortwave frequency band; the multi-channel synchronous capture circuit extracts useful service channels by capturing specific burst waveforms, and stops frequency band scanning to complete the reception of baseband data, thereby realizing blind reception of shortwave signals within the shortwave frequency band.

[0081] The shortwave channel multi-channel receiving system provided by the embodiment of the present invention has two working modes of full-band scanning reception and fixed-frequency reception, and can switch between the two working modes; the shortwave channel multi-channel receiving system can receive analog speech, voice-coded speech, voice text messages, data, and short message services; the full-band scanning reception mode can realize parallel reception and scanning reception of multiple signals at the same time; the fixed-frequency reception mode can realize the reception of three-channel short message services.

[0082] like Figure 2 As shown, a data processing method for a shortwave channel multi-channel receiving system provided by an embodiment of the present invention includes:

[0083] S101, when the shortwave antenna of the RF receiving module receives a shortwave signal, the shortwave signal is sent to the bandpass filter for filtering, and the filtered signal is sent to the RF front-end processing circuit, and the RF front-end processing circuit performs front-end low-noise amplification and low-pass filtering on the signal; the processed signal is then converted to digital by the AD sampling circuit, and the digital RF signal generated after the analog-to-digital conversion is sent to the digital channel module;

[0084] S102, the digital channel module adopts short-wave multi-channel receiving and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit according to the set scanning time interval. The radio frequency processing circuit switches the frequency of the channel according to the frequency segment specified by the frequency switching instruction;

[0085] If the multi-channel synchronous capture circuit captures a "start" synchronization header on a certain channel in a certain frequency band, the multi-channel synchronous capture circuit stops triggering the frequency switching action, and sends the data of the channel that captures the "start" synchronization header to the signal demodulation circuit through the second communication interface. At this time, the system enters the receiving state from the scanning state; in the receiving state, the multi-channel synchronous capture circuit continuously sends the channel data to the signal demodulation circuit through the second communication interface, the signal demodulation circuit demodulates the channel data in a conventional system, and sends the demodulated text or voice data to the control processing circuit through the third communication interface, and the control processing circuit performs corresponding display or playback; the multi-channel synchronous capture circuit is also capturing the "end" synchronization header while sending data to the signal demodulation circuit. If the "end" synchronization header is captured, the multi-channel synchronous capture circuit stops sending valid channel data to the signal demodulation circuit, and restarts to trigger the frequency switching action according to the set scanning time interval. At this time, the system enters the scanning state from the receiving state; during the operation of the system, it switches between the scanning state and the receiving state.

[0086] The present invention is specifically implemented:

[0087] The present invention is implemented by adopting the following technical scheme.

[0088] Technical solution 1:

[0089] A shortwave channel multi-channel receiving system is mainly composed of a radio frequency receiving module and a digital channel module. The radio frequency receiving module includes a shortwave antenna, a bandpass filter, a radio frequency front-end processing circuit and an AD sampling circuit; the digital channel module includes a radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit. The input end of the digital channel module is electrically connected to the output end of the radio frequency receiving module.

[0090] The characteristics and further improvements of the technical solution 1 of the present invention are:

[0091] (1) The RF receiving module includes a shortwave antenna, a bandpass filter, a RF front-end processing circuit and an AD sampling circuit which are electrically connected in sequence. The bandpass filter is used to receive signals from the antenna and to suppress the signals from the antenna out of band; the RF front-end processing circuit is used to perform front-end low-noise amplification and low-pass filtering on the signals; and the AD sampling circuit is used to perform analog-to-digital conversion on the filtered signals.

[0092] (2) The digital channel module includes an electrically connected radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit, and a control processing circuit. The radio frequency processing circuit is bidirectionally connected to the multi-channel synchronous capture circuit through a first communication interface, bidirectionally connected to the datagram demodulation circuit through a first communication interface, unidirectionally connected to the multi-channel synchronous capture circuit through a second communication interface, and unidirectionally connected to the control processing circuit through a fourth communication interface; the multi-channel synchronous capture circuit is bidirectionally connected to the signal demodulation circuit through the first communication interface; the signal demodulation circuit is unidirectionally connected to the datagram demodulation circuit through a third communication interface, unidirectionally connected to the control processing circuit through a fourth communication interface, and bidirectionally connected to the control processing circuit through a fifth communication interface.

[0093] (3) The RF processing circuit is used to perform down-conversion and extraction filtering on the signal after AD broadband sampling, and to send the digital baseband signal generated after the down-conversion processing to the multi-channel synchronous capture circuit for scanning and capture. The multi-channel synchronous capture circuit is used to realize the multi-channel capture function of the "start" and "end" synchronization headers.

[0094] (4) The signal demodulation circuit is used to demodulate the digital baseband signal after synchronous capture from the multi-channel synchronous capture circuit, and send the data generated by the baseband demodulation to the control processing circuit for display or playback.

[0095] (5) The datagram demodulation circuit is used to implement the voice coder function when the system is in a scanning state, and to demodulate the datagram service when the system is in a fixed frequency state, and to send the demodulated data to the signal demodulation circuit through the third communication interface. The signal demodulation circuit outputs the data to the control processing circuit for display through the fifth communication interface.

[0096] (6) The control processing circuit is used to configure the parameters of the radio frequency processing circuit and the multi-channel synchronous capture circuit. The control processing circuit is used to perform audio digital-to-analog conversion on the signal demodulated by the signal demodulation circuit and output the audio signal, which is then amplified by the audio power amplifier and output by the speaker.

[0097] Technical solution 2:

[0098] A data processing method for a shortwave channel multi-channel receiving system is applied to the shortwave channel multi-channel receiving system as described in technical solution 1, and the method comprises:

[0099] When the shortwave antenna of the RF receiving module receives a shortwave signal, it sends the shortwave signal to the bandpass filter for filtering, and the filtered signal is sent to the RF front-end processing circuit, which performs front-end low-noise amplification and low-pass filtering on the signal. The processed signal is then converted to digital by the AD sampling circuit, and the digital RF signal generated after the analog-to-digital conversion is sent to the digital channel module.

[0100] The digital channel module adopts short-wave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the RF processing circuit through the edge trigger control processing circuit at a set scanning time interval. The RF processing circuit switches the frequency of the channel according to the frequency segment specified by the frequency switching instruction. If the multi-channel synchronous capture circuit captures the "start" synchronization header on a certain channel in a certain frequency segment, the multi-channel synchronous capture circuit stops triggering the frequency switching action, and sends the data of the channel that captures the "start" synchronization header to the signal demodulation circuit through the second communication interface. At this time, the system enters the receiving state from the scanning state. In the receiving state, the multi-channel synchronous capture circuit continuously sends the channel data to the signal demodulation circuit through the second communication interface. The signal demodulation circuit demodulates the channel data in a conventional system, and sends the demodulated text or voice data to the control processing circuit through the third communication interface. The control processing circuit performs corresponding display or playback. The multi-channel synchronous capture circuit is capturing the "end" synchronization header while sending data to the signal demodulation circuit. If the "end" synchronization header is captured, the multi-channel synchronous capture circuit stops sending valid channel data to the signal demodulation circuit and restarts to trigger the frequency switching action according to the set scanning time interval. At this time, the system enters the scanning state from the receiving state. During the operation of the system, it switches between the scanning state and the receiving state.

[0101] The characteristics and further improvements of the technology of the present invention are:

[0102] The shortwave channel multi-channel receiving system adopts broadband garrison and segmented scanning mode, and can simultaneously monitor and capture multiple parallel channels to achieve blind reception of signals within the shortwave frequency band. The shortwave channel multi-channel receiving system divides the shortwave frequency band to form a large number of channels at specific intervals. At the same time, it can detect multiple parallel channels within a certain bandwidth and scan within the entire shortwave frequency band. The multi-channel synchronous capture circuit extracts useful service channels by capturing specific burst waveforms, and stops the frequency band scanning to complete the reception of baseband data, thereby achieving blind reception of shortwave signals within the shortwave frequency band. The shortwave channel multi-channel receiving system has two working modes: full-band scanning reception and fixed-frequency reception, and can switch between the two working modes. The shortwave channel multi-channel receiving system can receive analog calls, voice code calls, voice text messages, data, short messages and other services. The full-band scanning reception mode can achieve parallel reception and scanning reception of multiple signals at the same time. The fixed-frequency reception mode can achieve reception of three-way short message services.

[0103] The beneficial effects of the present invention are as follows: the shortwave channel multi-channel receiving system utilizes shortwave multi-channel receiving and multi-channel synchronous rapid capture technology to simultaneously monitor and capture multiple parallel channels, realize blind reception of signals within the shortwave frequency band, and realize three-way short message reception service in fixed-frequency receiving mode. The utilization efficiency and flexibility of the shortwave spectrum are improved, providing huge performance improvement potential for shortwave communication systems. Compared with traditional shortwave systems with single-channel working mode, the present invention can continuously listen to the entire working frequency band at the same time, realize multi-channel reception, greatly improve the quality and efficiency of shortwave communications, and has broad application prospects in the fields of military and emergency communications.

[0104] Reference Figure 1 , is a schematic diagram of the structure of a shortwave channel multi-channel receiving system of the present invention. The system is mainly composed of a radio frequency receiving module and a digital channel module. In an embodiment of the present invention, the radio frequency receiving module includes a shortwave antenna, a bandpass filter, a radio frequency front-end processing circuit and an AD sampling circuit. The digital channel module mainly includes a radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit and a control processing circuit. The input end of the digital channel module is electrically connected to the output end of the radio frequency receiving module.

[0105] In an embodiment of the present invention, the radio frequency receiving module includes a short wave antenna, a bandpass filter, a radio frequency front-end processing circuit and an AD sampling circuit which are electrically connected in sequence. The bandpass filter is used to receive a signal from the antenna and to suppress the signal from the antenna out of band; the radio frequency front-end processing circuit is used to perform front-end low noise amplification and low-pass filtering on the signal; and the AD sampling circuit is used to perform analog-to-digital conversion on the signal after filtering.

[0106] In an embodiment of the present invention, the digital channel module includes an electrically connected radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit. The radio frequency processing circuit is bidirectionally connected to the multi-channel synchronous capture circuit through the first communication interface, bidirectionally connected to the datagram demodulation circuit through the first communication interface, unidirectionally connected to the multi-channel synchronous capture circuit through the second communication interface, and unidirectionally connected to the control processing circuit through the fourth communication interface; the multi-channel synchronous capture circuit is bidirectionally connected to the signal demodulation circuit through the first communication interface; the signal demodulation circuit is unidirectionally connected to the datagram demodulation circuit through the third communication interface, unidirectionally connected to the control processing circuit through the fourth communication interface, and bidirectionally connected to the control processing circuit through the fifth communication interface. The radio frequency processing circuit is used to perform down-conversion and extraction filtering processing on the signal after AD broadband sampling, and is used to send the digital baseband signal generated after the down-conversion processing to the multi-channel synchronous capture circuit for scanning and capture. The multi-channel synchronous capture circuit is used to realize the multi-channel capture function of the "start" and "end" synchronization heads. The signal demodulation circuit is used to demodulate the digital baseband signal after synchronous capture from the multi-channel synchronous capture circuit, and send the data generated by the baseband demodulation to the control processing circuit for display or playback. The datagram demodulation circuit is used to realize the vocoder function when the system is in a scanning state, and demodulate the datagram service when the system is in a fixed frequency state, and send the demodulated data to the signal demodulation circuit through the third communication interface. The signal demodulation circuit outputs it to the control processing circuit through the fifth communication interface for display. The control processing circuit is used to configure the parameters of the radio frequency processing circuit and the multi-channel synchronous capture circuit. The control processing circuit is used to perform audio digital-to-analog conversion on the signal demodulated from the signal demodulation circuit and output the audio signal, which is then amplified by the audio power amplifier and output by the speaker.

[0107] In the embodiment of the present invention, the shortwave channel multi-channel receiving system adopts broadband garrison and segmented scanning mode, which can simultaneously monitor and capture multiple parallel channels to achieve blind reception of signals within the shortwave frequency band. The shortwave channel multi-channel receiving system divides the shortwave frequency band to form a large number of channels at specific intervals. At the same time, it can detect multiple parallel channels within a certain bandwidth and scan within the entire shortwave frequency band. The multi-channel synchronous capture circuit extracts useful service channels by capturing specific burst waveforms, and stops the frequency band scanning to complete the reception of baseband data, thereby achieving blind reception of shortwave signals within the shortwave frequency band. The shortwave channel multi-channel receiving system has two working modes: full-band scanning reception and fixed-frequency reception, and can switch between the two working modes. The shortwave channel multi-channel receiving system can receive services such as analog speech, voice code speech, voice text messages, data, and short messages. The full-band scanning reception mode can realize the parallel reception and scanning reception of multiple signals at the same time, and the fixed-frequency reception mode can realize the reception of three-way short message services.

[0108] Furthermore, an embodiment of the present invention also provides a data processing method for a shortwave channel multi-channel receiving system. When the shortwave antenna of the radio frequency receiving module receives a shortwave signal, the shortwave signal is sent to a bandpass filter for filtering. The signal after filtering is sent to the radio frequency front-end processing circuit, and the radio frequency front-end processing circuit performs front-end low-noise amplification and low-pass filtering on the signal. The processed signal is then converted to digital by the AD sampling circuit, and the digital radio frequency signal generated after the analog-to-digital conversion is sent to the digital channel module. The digital channel module adopts shortwave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit at a set scanning time interval, and the radio frequency processing circuit switches the frequency of the channel according to the frequency segment specified by the frequency switching instruction. If the multi-channel synchronous capture circuit captures a "start" synchronization header on a certain channel in a certain frequency segment, the multi-channel synchronous capture circuit stops triggering the frequency switching action, and sends the data of the channel that captures the "start" synchronization header to the signal demodulation circuit through the second communication interface, and the system enters the receiving state from the scanning state. In the receiving state, the multi-channel synchronous capture circuit continuously sends the channel data to the signal demodulation circuit through the second communication interface. The signal demodulation circuit demodulates the channel data in a conventional manner and sends the demodulated text or voice data to the control processing circuit through the third communication interface. The control processing circuit performs corresponding display or playback. While sending data to the signal demodulation circuit, the multi-channel synchronous capture circuit is also capturing the "end" synchronization header. If the "end" synchronization header is captured, the multi-channel synchronous capture circuit stops sending valid channel data to the signal demodulation circuit and restarts to trigger the frequency switching action according to the set scanning time interval. At this time, the system enters the scanning state from the receiving state. During the operation of the system, it switches between the scanning state and the receiving state.

[0109] Furthermore, the first communication interface is a multi-channel buffered serial port McBSP; the second communication interface is a universal parallel port UPP; the third communication interface is a parallel interface HPI; the fourth communication interface is a peripheral interface SPI; and the fifth communication interface is an asynchronous serial interface UART.

[0110] When in use, after the shortwave channel multi-channel receiving system is turned on, the multi-channel synchronous capture circuit is in a cyclic multi-channel scanning capture state. When a synchronization head is captured, it will stay at the frequency, send the baseband signal to the signal demodulation circuit for demodulation, and notify the control processing circuit to set the frequency of the radio frequency processing circuit. The control processing circuit also sets the bandpass filter to cut the band. When the user selects the fixed frequency mode, the signal demodulation circuit program is reloaded, and the control processing circuit controls the radio frequency processing circuit through instructions to complete the replacement of the three fixed frequencies. The multi-channel synchronous capture circuit directly outputs the three-channel data to the signal demodulation circuit and the datagram demodulation circuit. The datagram demodulation circuit completes the demodulation of the three short messages and transmits the demodulated information to the control processing circuit. The control processing circuit stores and displays it on the LCD.

[0111] The shortwave channel multi-channel receiving system of the present invention utilizes shortwave multi-channel receiving and multi-channel synchronous rapid capture technology, can realize blind reception of signals within the shortwave frequency band in the full-band scanning receiving mode, and can realize three-channel short message receiving service in the fixed-frequency receiving mode, thereby improving the utilization efficiency and flexibility of the shortwave spectrum and greatly improving the quality of shortwave communication.

[0112] Relevant evidence of the technical effects achieved by the embodiments of the present invention.

[0113] a) Shortwave multi-channel reception technology

[0114] The wireless RF signal received by the shortwave channel multi-channel receiving system is amplified by the front-end RF filtering and enters the AD sampling circuit for digital sampling and conversion into a digital RF signal to be sent to the digital channel module for processing. After digital down-conversion, extraction and sideband filtering, digital filtering, and automatic gain control, the digital baseband signal is generated and sent to the multi-channel synchronous capture circuit for subsequent digital signal processing. The digital processing process is as follows: Figure 3 shown.

[0115] The rate of the RF A / D converter at the receiving end is 73.728MSa / s. The digital RF signal is frequency-shifted to a digital baseband signal with a sampling rate of 73.728MSa / s centered at 0, and first passes through a 96-fold decimation filter to obtain a signal with a sampling rate of 768KSa / s. The design of this filter has the characteristics of high precision, variable decimation ratio and thus variable available bandwidth. By controlling the decimation ratio parameters, it can be applied to applications with different bandwidths.

[0116] The signal with a sampling rate of 768KSa / s is then filtered through a 16-fold decimation filter to obtain a signal with a sampling rate of 48KSa / s.

[0117] The last stage is an independent sideband filter with a sampling rate of 48KSa / s, which filters out the upper sideband and lower sideband signals respectively. These signals are then adjusted in amplitude by the automatic gain control module and sent to the multi-channel synchronous capture circuit, such as Figure 4 shown.

[0118] In the design of the system, an improved polyphase filter bank algorithm is used. Each polyphase filter bank can process multi-channel digital processing of 360 channels of signals at the same time. The complexity and data rate of digital processing are greatly reduced, and the real-time processing capability is improved. Figure 5 shown.

[0119] b) Multi-channel synchronous fast acquisition technology

[0120] Synchronous capture algorithm design

[0121] Multi-channel synchronous fast capture technology realizes the capture and judgment operation of hundreds of signals and completes the synchronous fast capture of signals. In order to realize multi-channel synchronous fast capture technology, the synchronous capture algorithm of the signal is one of the core contents. The capture algorithm with excellent performance and low complexity is very important for devices with high power consumption requirements.

[0122] The system uses a synchronous capture algorithm based on sliding correlation FFT (Fast Fourier Transform), the principle diagram Figure 6 as follows.

[0123] The operation flow of the algorithm can be roughly summarized as follows: the length of the local synchronization preamble sequence is 128, which is composed of two 64-length sequences. The length of the sliding window is also 128, which is consistent with the local sequence. The receiving sequence sends 128 data to the sliding window and the local sequence for matched filtering operation each time and obtains 128 results. These 128 data are added two by two, which is called "grouping" to obtain 64 data. 64 zeros are inserted at the end of these 64 data, and a 128-point interpolation FFT is performed. Finally, the frequency deviation estimation and capture judgment are performed based on the FFT results and the spectral line position, and a synchronization capture operation is completed. The receiving sequence is moved forward by one sample point next time, and the above process is repeated.

[0124] ·Multi-channel synchronous capture circuit design

[0125] The multi-channel synchronous capture circuit simultaneously captures 360 channels of received data (each channel of data is a signal with a bandwidth of 3kHz), and selects one channel of data with a valid signal to send to the signal demodulation circuit for further service demodulation processing. The multi-channel synchronous capture circuit receives 360 channels of data at the same time, and performs the same operation on each channel of data, that is, caches first, then performs correlation, spectrum shifting, FFT, peak value judgment, and finally finds the maximum value among the 360 ​​judgment results and outputs the data of that channel.

[0126] In order to reduce resource consumption and power consumption, the multi-channel synchronous capture circuit divides every 15 input data into a group. The time slot selection module sends these 15 input data to the subsequent modules in different time slots for correlation, spectrum shifting, FFT and peak judgment operations, and finally sends the judged correlation peak to the subsequent module for further processing. By instantiating this module 24 times, you can get the data processing architecture of all 360 channels, as shown in the figure. Figure 7 shown.

[0127] The comparison and judgment module collects 24 relative peak values ​​output by 24 peak judgment modules, selects the maximum value and compares it with a threshold set in advance. If it is greater than the threshold, it is considered that the synchronization preamble sequence may be captured, and the corresponding cache will be prepared to output data, and the output enable of the cache will be raised.

[0128] When the 360-channel select 1 output module detects that the output enable of one of the caches is pulled high, it will force the output enable of all other caches to be pulled low (to ensure that the output process is not disturbed), and then set the channel number to the number of the cache with the output enable pulled high.

[0129] After a complete round of synchronous capture is completed, the multi-channel synchronous capture circuit sends the data to the signal demodulation circuit and waits for the signal demodulation circuit to give a reset signal to restart the next round of capture.

[0130] It should be noted that the embodiments of the present invention can be implemented by hardware, software, or a combination of software and hardware. The hardware portion can be implemented using dedicated logic; the software portion can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. A person of ordinary skill in the art will appreciate that the above-mentioned devices and methods can be implemented using computer executable instructions and / or contained in a processor control code, such as a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. Such code is provided on the carrier medium. The device and its modules of the present invention can be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., can also be implemented by software executed by various types of processors, and can also be implemented by a combination of the above-mentioned hardware circuits and software, such as firmware.

[0131] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A shortwave channel multi-channel receiving system, characterized in that: The shortwave channel multi-path receiving system comprises: The RF receiving module and the digitized channel module are composed; the input end of the digitized channel module is connected to the output end circuit of the RF receiving module; The radio frequency receiving module is used to receive the shortwave signal through the shortwave antenna, send the shortwave signal to the bandpass filter for filtering, send the filtered signal to the radio frequency front-end processing circuit, and the radio frequency front-end processing circuit performs front-end low-noise amplification and low-pass filtering on the signal; the processed signal is then converted into analog-to-digital by the AD sampling circuit, and the digital radio frequency signal generated after the analog-to-digital conversion is sent to the digital channel module; The digital channel module is used to adopt short-wave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit according to the set scanning time interval. The radio frequency processing circuit switches the frequency of the channel according to the frequency segment specified by the frequency switching instruction; The radio frequency receiving module includes a short wave antenna, a band pass filter, a radio frequency front end processing circuit and an AD sampling circuit; The digital channel module includes a radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit.

2. The shortwave channel multi-channel receiving system and data processing method thereof as claimed in claim 1, characterized in that: The radio frequency receiving module includes a shortwave antenna, a bandpass filter, a radio frequency front-end processing circuit and an AD sampling circuit which are electrically connected in sequence; the bandpass filter is used to receive signals from the antenna and to suppress the signals from the antenna out of band; the radio frequency front-end processing circuit is used to perform front-end low-noise amplification and low-pass filtering on the signals; and the AD sampling circuit is used to perform analog-to-digital conversion on the filtered signals.

3. The shortwave channel multi-channel receiving system and data processing method thereof as claimed in claim 1, characterized in that: The digital channel module includes an electrically connected radio frequency processing circuit, a multi-channel synchronous capture circuit, a signal demodulation circuit, a datagram demodulation circuit and a control processing circuit; the radio frequency processing circuit is bidirectionally connected to the multi-channel synchronous capture circuit through a first communication interface, is bidirectionally connected to the datagram demodulation circuit through the first communication interface, is unidirectionally connected to the multi-channel synchronous capture circuit through a second communication interface, and is unidirectionally connected to the control processing circuit through a fourth communication interface; the multi-channel synchronous capture circuit is bidirectionally connected to the signal demodulation circuit through the first communication interface; the signal demodulation circuit is unidirectionally connected to the datagram demodulation circuit through a third communication interface, is unidirectionally connected to the control processing circuit through a fourth communication interface, and is bidirectionally connected to the control processing circuit through a fifth communication interface; The radio frequency processing circuit is used to perform down-conversion and extraction filtering on the signal after AD broadband sampling, and to send the digital baseband signal generated after the down-conversion processing to the multi-channel synchronous capture circuit for scanning and capture; the multi-channel synchronous capture circuit is used to realize the multi-channel capture function of the "start" and "end" synchronization heads; The signal demodulation circuit is used to demodulate the digital baseband signal after synchronous capture from the multi-channel synchronous capture circuit, and send the data generated by the baseband demodulation to the control processing circuit for display or playback; The datagram demodulation circuit is used to implement the vocoder function when the system is in a scanning state, and to demodulate the datagram service when the system is in a fixed frequency state, and to send the demodulated data to the signal demodulation circuit through the third communication interface, and the signal demodulation circuit outputs the data to the control processing circuit for display through the fifth communication interface; The first communication interface is a multi-channel buffered serial port McBSP; the second communication interface is a universal parallel port UPP; the third communication interface is a parallel interface HPI; the fourth communication interface is a peripheral interface SPI; and the fifth communication interface is an asynchronous serial interface UART.

4. The shortwave channel multi-channel receiving system and data processing method thereof as claimed in claim 2, characterized in that: The control processing circuit is used to realize the control of the bandpass filter; the control processing circuit is used to configure the parameters of the radio frequency processing circuit and the multi-channel synchronous capture circuit; the control processing circuit is used to perform audio digital-to-analog conversion on the signal demodulated by the signal demodulation circuit and output the audio signal, which is then amplified by the audio power amplifier and output by the speaker.

5. The shortwave channel multi-channel receiving system and data processing method thereof as claimed in claim 1, characterized in that: The shortwave channel multi-channel receiving system adopts a broadband garrison and segmented scanning mode, can monitor and capture multiple parallel channels at the same time, and can realize blind reception of signals within the shortwave frequency band; the shortwave channel multi-channel receiving system divides the shortwave frequency band to form a large number of channels at specific intervals; at the same time, it can detect multiple parallel channels within a certain bandwidth and scan within the entire shortwave frequency band; the multi-channel synchronous capture circuit extracts useful service channels by capturing specific burst waveforms, and stops frequency band scanning to complete the reception of baseband data, thereby realizing blind reception of shortwave signals within the shortwave frequency band.

6. The shortwave channel multi-channel receiving system and data processing method thereof as claimed in claim 1, characterized in that: The shortwave channel multi-channel receiving system has two working modes: full-band scanning reception and fixed-frequency reception, and can switch between the two working modes; the shortwave channel multi-channel receiving system can receive analog speech, voice-coded speech, voice text messages, data, and short message services; the full-band scanning reception mode can realize parallel reception and scanning reception of multiple signals at the same time; the fixed-frequency reception mode can realize the reception of three-channel short message services.

7. A data processing method for a shortwave channel multi-channel receiving system implementing the shortwave channel multi-channel receiving system as claimed in any one of claims 1 to 6, characterized in that: The data processing method of the shortwave channel multi-channel receiving system comprises: Step 1, when the shortwave antenna of the RF receiving module receives the shortwave signal, the shortwave signal is sent to the bandpass filter for filtering, and the filtered signal is sent to the RF front-end processing circuit, and the RF front-end processing circuit performs front-end low-noise amplification and low-pass filtering on the signal; the processed signal is then converted into digital by the AD sampling circuit, and the digital RF signal generated after the analog-to-digital conversion is sent to the digital channel module; Step 2: The digital channel module adopts shortwave multi-channel reception and multi-channel synchronous fast capture technology. The multi-channel synchronous capture circuit sends a frequency switching instruction to the radio frequency processing circuit through the edge trigger control processing circuit according to the set scanning time interval. The radio frequency processing circuit switches the channel frequency according to the frequency segment specified by the frequency switching instruction. If the multi-channel synchronous capture circuit captures a "start" synchronization header on a certain channel in a certain frequency band, the multi-channel synchronous capture circuit stops triggering the frequency switching action, and sends the data of the channel that captures the "start" synchronization header to the signal demodulation circuit through the second communication interface. At this time, the system enters the receiving state from the scanning state; in the receiving state, the multi-channel synchronous capture circuit continuously sends the channel data to the signal demodulation circuit through the second communication interface, the signal demodulation circuit demodulates the channel data in a conventional system, and sends the demodulated text or voice data to the control processing circuit through the third communication interface, and the control processing circuit performs corresponding display or playback; the multi-channel synchronous capture circuit is also capturing the "end" synchronization header while sending data to the signal demodulation circuit. If the "end" synchronization header is captured, the multi-channel synchronous capture circuit stops sending valid channel data to the signal demodulation circuit, and restarts to trigger the frequency switching action according to the set scanning time interval. At this time, the system enters the scanning state from the receiving state; during the operation of the system, it switches between the scanning state and the receiving state.

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