CN113572552B - Communication system of virtual signaling channel of autonomous frequency-selecting short-wave radio station - Google Patents
Communication system of virtual signaling channel of autonomous frequency-selecting short-wave radio station Download PDFInfo
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- CN113572552B CN113572552B CN202111125752.7A CN202111125752A CN113572552B CN 113572552 B CN113572552 B CN 113572552B CN 202111125752 A CN202111125752 A CN 202111125752A CN 113572552 B CN113572552 B CN 113572552B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7143—Arrangements for generation of hop patterns
Abstract
The invention discloses a communication system of a virtual signaling channel of an autonomous frequency-selecting short-wave radio station. The accessible frequency set decision function module, the frequency hopping list decision function module, the encryption key decision function module and the backup channel decision function module provided by the invention utilize an out-of-band virtual signaling channel, and can help realize the rapidness between calling and called parties: 1) exchanging a accessible frequency set in real time, 2) exchanging a frequency hopping list in real time, 3) exchanging voice key frame encryption key information in real time, and 4) backing up an autonomous frequency selection short-wave radio station link in real time. The virtual signaling channel concept provided by the invention takes a satellite link as a virtual signaling channel and a standby service channel of the autonomous frequency-selecting short-wave radio station, realizes the real-time exchange of idle channel information between calling and called parties, updates a dynamic frequency hopping list in real time, changes a voice key frame encryption key in real time, can be used as the standby service channel when the communication of the autonomous frequency-selecting short-wave radio station is interrupted, keeps the basic information exchange between the autonomous frequency-selecting short-wave radio stations, and keeps the smooth service.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a communication system of a virtual signaling channel of an autonomous frequency-selecting short-wave radio station.
Background
The current working mode of the autonomous frequency selection short-wave radio station is that the radio station enters a broadband receiving waiting state after being started, and then an attempt call is initiated on an empirical frequency point and a real-time spectrum sensing idle channel. The radio station adopts full-band broadband signal analysis and processing technology and has the capability of capturing call signals. When the captured address is the address of the home, a response signal is sent out on the frequency, then the two parties detect, and the best frequency for the two parties to communicate is found out according to the frequency optimization strategy for the accessible frequency set to establish a link for service communication. In the communication process, if the current frequency is interfered or the channel quality is deteriorated, the radio station can automatically search an interference gap in a full frequency band range, perform data fusion on a multi-time sensing result through frequency spectrum sensing, and when the fusion result is that the channel is idle (namely, no interference or the interference degree can be accepted by a user), and when the signal-to-noise ratio of the current channel is greater than a set threshold value, both communication parties start a link establishment process. If the link is failed to be established, channel switching is carried out according to the channel quality optimization selection criterion, and the process is repeated. And if the link is successfully established, the two communication parties continue to carry out service communication. After the communication is finished, either party can initiate a link disconnection signal, and both parties return to the scanning state.
The prior art implementation has several weaknesses:
1) the call setup time is long. The calling party initiates blind calling on the experience frequency point and the real-time spectrum sensing idle channel, the spectrum interference condition of the current called party is unknown, the calling party is captured completely by depending on the analysis and processing capability of the full-band broadband signal of the called party, if the intersection of the experience frequency point of the calling party and the implementation spectrum sensing idle channel with the called party is very small, the calling party can be captured by trying the other party for many times, the call establishment may need a long time, and during the period, the attempted calling frequency point patterns of the calling party can be captured by the third party one by one and initiate interference to the third party one by one;
2) the accessible frequency set needs to be determined after detection by both parties. In the process of establishing the possible frequency set, two parties are required to initiate detection, and then the best frequency is determined according to a frequency optimization strategy, a link is established, and service communication is initiated. In the process, the active trial frequency point patterns of the two parties are captured by the third party at the same time, the determined optimal frequency is also within the trial frequency point, once the frequency point is determined, continuous communication is initiated, and the third party can capture signals in the shortest time to implement interference;
3) and the frequency spectrum sensing search gap result after frequency point interference or channel quality deterioration needs data fusion between the calling party and the called party. When the frequency point is infected or the channel quality is deteriorated in the communication process, the communication may be interrupted, both sides need to sense the available frequency point or the low-interference frequency point in the full frequency band range, and the data of each other needs to be fused to determine the next communication frequency point. In the data fusion process, patterns of frequency points tried by two parties for many times can be captured by a third party, and once a certain frequency point initiates a continuous signal, interference can be implemented by the third party;
4) in the process of repeated attempts of the calling party and the called party, the third party can gradually obtain the first call initiating attempt frequency point of the calling party and the first call initiating attempt frequency point of the called party and the attempt frequency point pattern after interference, because a large amount of data is accumulated in the multiple attempts, the third party can even reason out part or all frequency hopping patterns in the reverse direction, the third party can even try to interfere the deduced frequency hopping patterns one by a plurality of frequency points, and the next attempt frequency point of the calling party and the called party is received and is perfected until all the frequency hopping patterns are finally obtained;
5) after capturing the communication frequency point patterns of the calling and called links, the third party can select the communication frequency points of the calling and called parties, monitor the code streams of the communication of the receiving parties and then carry out brute force cracking on the encrypted message so as to completely acquire the encrypted communication contents of the two parties;
6) after the third party obtains the communication frequency point patterns of the calling party and the called party, the third party can also choose to block the communication of the calling party and the called party according to the communication frequency point patterns, and under extreme conditions, the calling party and the called party lose the communication capacity and contact is completely interrupted.
Therefore, how to realize real-time exchange of idle channels, exchange of common-frequency sets and frequency hopping lists and encryption key information between calling and called parties in the satellite communication process is a problem to be solved urgently at present.
Disclosure of Invention
In view of this, the present invention provides a communication system for a virtual signaling channel of an autonomous frequency-selecting short-wave radio station, which can implement real-time exchange of idle channels, exchange of common-frequency sets and frequency hopping lists and encryption key information between a calling party and a called party, thereby ensuring that communication services are always smooth.
In order to achieve the purpose, the technical scheme of the invention is as follows: a communication system of a virtual signaling channel of an autonomous frequency selection short-wave radio station comprises a passable frequency set decision function module, a frequency hopping list function decision module, an encryption key decision function module and a backup channel decision function module;
the accessible frequency set decision function module executes the synchronization between the possible frequency set decision and the calling party and the called party; the frequency hopping list decision function module executes the frequency hopping list decision and the synchronization between the calling party and the called party; the encryption key decision function module executes the encryption key decision and the synchronization between the calling party and the called party; and the backup channel decision function module executes the synchronization between the backup service channel starting function and the calling party and the called party.
Further, the accessible frequency set decision function module executes the following procedures:
triggering spectrum sensing by a accessible frequency set decision function module of a called party, generating a T-moment idle spectrum list which is arranged from high to low in signal-to-noise ratio, comparing the T-moment idle spectrum list with a T-1 moment idle spectrum list, generating difference value information of the T-moment idle spectrum list and the T-1 moment idle spectrum list, and encrypting the list difference value information to obtain list difference value encryption information; checking whether a link exists between the calling party and the called party, if so, sending the list difference value encryption information through the link, and if not, sending the list difference value encryption information through a virtual signaling channel.
And triggering spectrum sensing by a accessible frequency set decision function module of the calling party, generating an idle spectrum list at the time T with the signal-to-noise ratio arranged from high to low, comparing the idle spectrum list at the time T-1, and generating a difference value of the idle spectrum list at the time T and the idle spectrum list at the time T-1.
After receiving the list difference value encryption information, the calling party decrypts the list difference value to obtain the idle spectrum list difference value between the called party T and the T-1 moment, generates a T moment accessible frequency set, compares the T moment accessible frequency set with the T-1 moment accessible frequency set to generate a T moment and T-1 moment accessible frequency set difference value, updates a frequency hopping list decision function module, and simultaneously encrypts the T moment and T-1 moment accessible frequency set difference value information to obtain frequency set difference value encryption information; checking whether a link exists between a calling party and a called party, if so, sending the frequency set difference value encryption information through the link, and if not, sending the frequency set difference value encryption information through a virtual signaling channel.
And after receiving the frequency set difference value encryption information, the called party decrypts the information to obtain the difference value of the accessible frequency set at the T moment and the T-1 moment, and updates the frequency hopping list decision function module.
The calling party and the called party adopt the new accessible frequency set to continue communication or initiate a new call attempt.
Further, the frequency hopping list decision function module executes the following procedures:
after receiving the difference value of the enabled frequency set between the T moment and the T-1 moment, the calling party frequency hopping list decision function module analyzes the frequency hopping list at the T-1 moment, generates a frequency hopping list at the T moment according to a frequency hopping decision algorithm, compares the frequency hopping list at the T moment with the frequency hopping list at the T-1 moment, generates the difference value and the validity period of the frequency hopping list at the T moment and the frequency hopping list at the T-1 moment, updates an encryption key decision module, simultaneously encrypts the difference value and the validity period information of the frequency hopping list at the T moment and the frequency hopping list at the T-1 moment, records the information as frequency hopping encryption information, checks whether a link exists between a calling party and a called party, sends the frequency hopping encryption information through the link if the link exists, and sends the frequency hopping encryption information through a virtual signaling channel if the link does not exist.
And after receiving the frequency hopping encryption information, the called party decrypts the information to obtain the difference value and the validity period of the T and T-1 time frequency hopping lists, generates a T time frequency hopping list and updates the encryption key decision module.
Further, the encryption key decision function module executes the following procedures:
after receiving the difference value and the validity period of the frequency hopping list at the T moment and the T-1 moment, the calling party encryption key decision module analyzes a T-1 moment key set, generates a T moment key set according to a key decision algorithm, compares the T moment key set with the T-1 moment key set, generates a T and T-1 moment key set difference value and validity period, updates a backup channel decision module, simultaneously encrypts the T and T-1 moment key set difference value and the validity period information, records the encrypted information as key encryption information, checks whether a link exists between a calling party and a called party, sends the key encryption information through the link if the link exists, and sends the key encryption information through a virtual signaling channel if the link does not exist.
And after receiving the key encryption information, the called party decrypts the key encryption information to obtain the difference value and the validity period of the key set at the T moment and the T-1 moment, generates the key set at the T moment and updates the backup channel decision module.
Further, the backup channel decision function module executes the following procedures:
after receiving the difference value between the key set at the time T and the key set at the time T-1 and the validity period, the calling party backup channel decision module checks whether a link exists between a calling party and a called party, if the link exists, the calling party backup channel decision module keeps a standby service channel idle, if the link does not exist, the calling party backup channel decision module occupies the standby service channel, namely a satellite link, generates a link recovery instruction, updates the accessible frequency set decision function module, simultaneously executes encryption of link recovery instruction information, records the link recovery instruction information as link encryption information, and sends the link recovery information through the standby channel; and continuously using the standby service channel, sending and receiving basic service information and keeping the service smooth.
And after receiving the link encryption information, the called party decrypts the link encryption information to obtain a link recovery instruction, updates the accessible frequency set decision function module, continues to use the standby service channel, sends and receives basic service information and keeps the service smooth.
Has the advantages that:
1. the accessible frequency set decision function module, the frequency hopping list function decision module, the encryption key decision function module and the backup channel decision function module provided by the invention utilize an out-of-band virtual signaling channel, and can help realize the rapidness between calling and called parties: 1) exchanging a accessible frequency set in real time, 2) exchanging a frequency hopping list in real time, 3) exchanging voice key frame encryption key information in real time, and 4) backing up an autonomous frequency selection short-wave radio station link in real time. The virtual signaling channel concept provided by the invention takes a satellite link as a virtual signaling channel and a standby service channel of the autonomous frequency-selecting short-wave radio station, realizes the real-time exchange of idle channel information between calling and called parties, updates a dynamic frequency hopping list in real time, changes a voice key frame encryption key in real time, can be used as the standby service channel when the communication of the autonomous frequency-selecting short-wave radio station is interrupted, keeps the basic information exchange between the autonomous frequency-selecting short-wave radio stations, and keeps the smooth service.
2. The invention can avoid repeatedly trying to establish the call: the virtual signaling channel is used for exchanging the accessible frequency set in real time, so that the number of calling attempts can be greatly reduced, the probability of exposing the frequency point patterns of the calling attempts is reduced, repeated attempts by both parties are avoided, and the call establishment time is shortened.
3. The invention can avoid generating a passable frequency set by repeated detection: the virtual signaling channel is used for exchanging the accessible frequency set in real time and updating in real time, so that the times of repeated detection of the two parties can be greatly reduced, the probability of exposing the frequency point patterns actively tried by the two parties possibly caused by multiple interactions is reduced, and the communication completion probability is provided;
4. the invention can realize the shortening of the fusion process of the communicable frequencies of both sides: the virtual signaling channel is used for exchanging the accessible frequency set in real time and updating in real time, so that a communication link can be quickly recovered, the success rate of link establishment is increased, the probability that a calling party and a called party try to expose trial frequency point patterns for many times in the process of determining the data fusion of the next communication frequency point is reduced, and the communication reliability is improved.
5. The invention can reduce the probability of the cracked frequency hopping pattern: the virtual signaling channel is used for exchanging the frequency hopping list in real time, so that the probability of reversely reasoning frequency hopping patterns by accumulated data of a third party in the repeated trial process of the calling party and the called party can be reduced, the communication blocking rate is reduced, and the communication success rate is improved.
6. The invention can realize real-time dynamic adjustment of the voice key frame encryption key: the calling party and the called party can select an in-band combined out-of-band mode or an out-of-band mode, exchange voice key frame encryption key information in real time by using a virtual signaling channel, change the voice key frame encryption key at any time, reduce the risk of completely cracking the communication content even if the complete code stream is intercepted by the other party, and improve the confidentiality of communication.
7. The invention can realize that the backup link provides a basic communication means: in extreme cases, a third party may obtain a complete frequency hopping pattern, implement full-band interference on a calling party and a called party, utilize a virtual signaling channel as one of real-time backup means, provide the most basic communication capability for the calling party and the called party, and also can help to quickly recover an autonomous frequency-selective short-wave radio station link.
Detailed Description
The present invention will be described in detail with reference to examples.
The invention provides a scheme provided by the invention, and provides a concept of a virtual signaling channel, wherein a satellite link (including but not limited to Beidou short messages, GPS, Gronass, low orbit satellites and the like) is used as a virtual signaling channel and a standby service channel of an autonomous frequency-selecting short-wave radio station, idle channel information is exchanged in real time, a dynamic frequency hopping list is updated in real time, a voice key frame encryption key is changed in real time, and the dynamic frequency hopping list can be used as the standby service channel when the communication of the autonomous frequency-selecting short-wave radio station is interrupted, so that the smooth service among the autonomous frequency-selecting short-wave radio stations is kept.
The invention provides a frequency set decision function module, a frequency hopping list function decision module, an encryption key decision function module and a backup channel decision function module, and provides a method for realizing the rapidness between calling and called parties by utilizing an out-of-band virtual signaling channel: 1) real-time accessible frequency set exchange, 2) real-time frequency hopping list exchange, 3) real-time voice key frame encryption key information exchange, and 4) link interruption backup of the short-wave radio station as an autonomous frequency selection.
1) The frequency set decision function module can be switched on:
the frequency set decision function module can be accessed to realize the synchronization between the possible frequency set decision and the calling party and the called party.
The called party can trigger spectrum sensing through a frequency set decision module, generate an idle spectrum list at the T moment from high to low in signal-to-noise ratio, compare the idle spectrum list at the T-1 moment to generate difference information of the idle spectrum list at the T moment and the T-1 moment, encrypt the information, check whether a link exists between the calling party and the called party, if the link exists, the encrypted information is sent through the link, and if the link does not exist, the encrypted information is sent through a virtual signaling channel.
The calling party can trigger spectrum sensing through a frequency set decision module, generate an idle spectrum list at the time T with the signal-to-noise ratio arranged from high to low, compare the idle spectrum list with the idle spectrum list at the time T-1, and generate a difference value of the idle spectrum list at the time T and the idle spectrum list at the time T-1.
After receiving the encrypted information, the calling party decrypts the encrypted information to obtain the difference value of the idle frequency spectrum list of the called party T and T-1 time, generates a T-time accessible frequency set, compares the T-time accessible frequency set with the T-1 time accessible frequency set to generate the difference value of the T-time accessible frequency set and the T-1 time accessible frequency set, updates a frequency hopping list decision function module, simultaneously encrypts the T-time accessible frequency set difference value information and the T-1 time accessible frequency set difference value information, checks whether a link exists between the calling party and the called party, if the link exists, the encrypted information is sent through the link, and if the link does not exist, the encrypted information is sent through a virtual signaling channel.
And after receiving the encrypted information, the called party decrypts the encrypted information to obtain the difference value of the accessible frequency sets at the moments T and T-1, and updates the decision function module of the frequency hopping list.
The calling party and the called party can adopt the new accessible frequency set to continue communication or initiate a new call attempt;
2) frequency hopping list decision function module
And the frequency hopping list decision function module is used for realizing the synchronization between the frequency hopping list decision and the calling party and the called party.
After receiving the difference value of the accessible frequency sets at the T moment and the T-1 moment, the calling party frequency hopping list decision function module analyzes the frequency hopping list at the T-1 moment, generates a frequency hopping list at the T moment according to a frequency hopping decision algorithm, compares the frequency hopping list at the T moment with the frequency hopping list at the T-1 moment, generates the difference value and the validity period of the frequency hopping list at the T moment and the frequency hopping list at the T-1 moment, updates the encryption key decision module, simultaneously encrypts the difference value and the validity period information of the frequency hopping list at the T moment and the T-1 moment, checks whether a link exists between a calling party and a called party, sends the encryption information through the link if the link exists, and sends the encryption information through a virtual signaling channel if the link does not exist.
And after receiving the encrypted information, the called party decrypts the encrypted information to obtain the difference value and the validity period of the T and T-1 time frequency hopping lists, generates a T time frequency hopping list and updates the encryption key decision module.
3) Encryption key decision function module
And the encryption key decision function module is used for realizing the synchronization between the encryption key decision and the calling party and the called party.
After receiving the difference value and the validity period of the T and T-1 time hopping list, the calling party encryption key decision module analyzes a T-1 time key set, generates a T time key set according to a key decision algorithm, compares the T time key set with the T-1 time key set, generates a T and T-1 time key set difference value and validity period, updates a backup channel decision module, simultaneously encrypts the T and T-1 time key set difference value and validity period information, checks whether a link exists between a calling party and a called party, sends encryption information through the link if the link exists, and sends the encryption information through a virtual signaling channel if the link does not exist.
And after receiving the encrypted information, the called party decrypts the encrypted information to obtain the difference value and the validity period of the key set at the T moment and the T-1 moment, generates the key set at the T moment and updates the backup channel decision module.
4) Backup channel decision function module
And the backup channel decision function module realizes the synchronization between the backup service channel starting function and the calling party and the called party.
After receiving the difference value and the valid period of the key set at the time of T and T-1, the calling party backup channel decision module checks whether a link exists between a calling party and a called party, if the link exists, the calling party backup channel decision module keeps a standby service channel idle, if the link does not exist, the calling party backup channel decision module occupies the standby service channel (namely a satellite link), generates a link recovery instruction, updates the accessible frequency set decision module, and simultaneously executes encryption of link recovery instruction information and sends the encrypted link recovery instruction information through the standby channel. And continuously using the standby service channel, sending and receiving basic service information and keeping the service smooth.
And after receiving the encrypted information, the called party decrypts the encrypted information to obtain a link recovery instruction and updates the accessible frequency set decision module. And continuously using the standby service channel, sending and receiving basic service information and keeping the service smooth.
Specific examples are as follows:
the utility model provides an independent frequency selection short wave radio station of big dipper short message is supported through the serial ports, initiates taiyuan to Xinjiang calling, taiyuan is the calling party, and Xinjiang is called, and its realization flow is as follows:
1) fast call establishment:
the Sinkiang radio station accessible frequency set decision module triggers spectrum sensing, generates a T-moment idle spectrum list which is arranged from high to low in signal-to-noise ratio, compares the T-moment idle spectrum list with a T-1 moment idle spectrum list, generates difference value information of the T-moment idle spectrum list and the T-1 moment idle spectrum list, encrypts the information, and because a link does not exist between a calling party and a called party, the encrypted information is sent to the Beidou module through a serial port, and the Beidou module sends the encrypted information through a short message.
The frequency set decision module which can be accessed by the Taiyuan radio station triggers spectrum sensing to generate a free spectrum list at the time T which is arranged from high to low in signal-to-noise ratio, and the free spectrum list is compared with the free spectrum list at the time T-1 to generate a difference value between the free spectrum list at the time T and the free spectrum list at the time T-1.
After the Beidou module of the Taiyuan radio station receives the encrypted information, the encrypted information is sent to the accessible frequency set decision module through the serial port. After the accessible frequency set decision module receives the encrypted information, decrypting to obtain the idle frequency spectrum list difference value between the called party T and the T-1 moment, generating a accessible frequency set at the T moment, comparing the accessible frequency set at the T-1 moment to generate the accessible frequency set difference value between the T moment and the T-1 moment, updating the frequency hopping list decision function module, simultaneously performing encryption on the accessible frequency set difference value information between the T moment and the T-1 moment, transmitting the encrypted information to the Beidou module through a serial port due to the fact that no link exists between a calling party and a called party, and transmitting the encrypted information through a short message by the Beidou module.
After receiving the encryption information, the Xinjiang radio station Beidou module sends the encryption information to the accessible frequency set decision module through the serial port. And after receiving the encrypted information, the accessible frequency set decision module decrypts the encrypted information to obtain a difference value of the accessible frequency sets at the T moment and the T-1 moment, and updates the frequency hopping list decision function module.
The Taiyuan radio station and the Xinjiang radio station complete the synchronization of the accessible frequency sets between the calling party and the called party through one-time information exchange, the calling party can directly initiate a calling attempt at the highest signal-to-noise ratio channel of the accessible frequency sets, the calling is established, and the two parties start normal communication.
2) And updating a frequency hopping list in real time:
the taiyuan radio station frequency hopping list decision function module analyzes a T-1 moment frequency hopping list after receiving a T-1 moment accessible frequency set difference value, generates a T moment frequency hopping list according to a frequency hopping decision algorithm, compares the T moment frequency hopping list with the T-1 moment frequency hopping list, generates a T-1 moment frequency hopping list difference value and a validity period, updates an encryption key decision module, and simultaneously encrypts T-1 moment frequency hopping list difference value and validity period information, although a communication link exists between a calling party and a called party, the taiyuan radio station frequency hopping list decision function module can select to send encryption information through a virtual signaling channel, the encryption information is sent to the big dipper module through a serial port, and the big dipper module sends the encryption information through a short message.
After receiving the encryption information, the Xinjiang radio station Beidou module sends the encryption information to the frequency hopping list decision function module through the serial port, the encryption information is sent to the frequency hopping list decision function module to be decrypted after receiving the encryption information, the difference value and the validity period of the T and T-1 moment frequency hopping lists are obtained, the T moment frequency hopping list is generated, and the encryption key decision module is updated.
The taiyuan radio station and the Xinjiang radio station complete the information updating of the frequency hopping list between the calling party and the called party through one-time information exchange, and the two parties adopt a new frequency hopping list from the moment T and keep smooth contact;
3) updating the voice key frame encryption key in real time:
after receiving the difference value and the validity of the T-and T-1-moment hopping list, the encryption key decision function module of the taiyuan radio station analyzes a T-1-moment key set, generates a T-moment key set according to a key decision algorithm, compares the T-moment key set with the T-1-moment key set, generates the difference value and the validity of the T-and T-1-moment key set, updates the backup channel decision module, and encrypts the T-and T-1-moment key set difference value and the validity although a communication link exists between a calling party and a called party, the taiyuan radio station encryption key decision function module can select to send encryption information through a virtual signaling channel, the encryption information is sent to the beidou module through a serial port, and the beidou module sends the encryption information through a short message.
And after receiving the encrypted information, the Xinjiang radio station Beidou module sends the encrypted information to the encryption key decision function module through the serial port, and after receiving the encrypted information, the encryption key decision function module decrypts the encrypted information to obtain the difference value and the validity period of the key set at the T moment and the T-1 moment, generates a key set at the T moment and updates the backup channel decision module.
The taiyuan radio station and the Xinjiang radio station complete the updating of the voice key frame encryption key set between the calling party and the called party through one-time information exchange, and the two parties adopt new key sets from the moment T to increase the communication information safety;
4) monitoring the link in real time to maintain communication continuity in extreme conditions
And detecting the link condition between the calling party and the called party after the decision function module of the backup channel of the taiyuan radio station receives the key set difference value and the validity period at the T moment and the T-1 moment. If the link exists, the backup channel decision function module keeps the spare service channel idle; under extreme conditions, if the link is interrupted, the backup channel decision function module immediately occupies a backup service channel after detecting the link interruption, generates a link recovery instruction, updates the passable frequency set decision module, simultaneously executes link recovery instruction information encryption, transmits the encryption information to the Beidou module through the serial port, and transmits the encryption information through short messages by the Beidou module. And continuously using the Beidou short message as a standby service channel, and sending and receiving the encrypted basic service information.
And after receiving the encrypted information, the Xinjiang radio station Beidou module sends the encrypted information to the backup channel decision function module through the serial port, and after receiving the encrypted information, the backup channel decision function module decrypts the encrypted information to obtain a link recovery instruction and updates the accessible frequency set decision module. And continuously using the Beidou short message as a standby service channel, and sending and receiving the encrypted basic service information.
Under the extreme condition of communication link interruption, the Taiyuan radio station and the Xinjiang radio station can immediately start the Beidou short message to serve as a basic information exchange link, keep the basic information smooth and trigger the establishment of a new link;
the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A communication system of a virtual signaling channel of an autonomous frequency selection short-wave radio station is characterized by comprising a accessible frequency set decision function module, a frequency hopping list decision function module, an encryption key decision function module and a backup channel decision function module;
the accessible frequency set decision function module executes the synchronization between the possible frequency set decision and the calling party and the called party;
the frequency hopping list decision function module executes frequency hopping list decision and synchronization between calling and called parties;
the encryption key decision function module executes the encryption key decision and the synchronization between the calling party and the called party;
the backup channel decision function module executes the synchronization between the backup service channel starting function and the calling party and the called party;
the accessible frequency set decision function module executes the following procedures:
triggering spectrum sensing by a accessible frequency set decision function module of a called party, generating a T-moment idle spectrum list which is arranged from high to low in signal-to-noise ratio, comparing the T-moment idle spectrum list with a T-1 moment idle spectrum list, generating difference value information of the T-moment idle spectrum list and the T-1 moment idle spectrum list, and encrypting the list difference value information to obtain list difference value encryption information; checking whether a link exists between a calling party and a called party, if so, sending the list difference value encryption information through the link, and if not, sending the list difference value encryption information through a virtual signaling channel;
the method comprises the steps that a accessible frequency set decision function module of a calling party triggers spectrum sensing, generates a T-moment idle spectrum list with a signal-to-noise ratio arranged from high to low, compares the T-moment idle spectrum list with a T-1 moment idle spectrum list, and generates a difference value of the T-moment idle spectrum list and the T-1 moment idle spectrum list;
after receiving the list difference value encryption information, the calling party decrypts the list difference value to obtain the idle spectrum list difference value between the called party T and the T-1 moment, generates a T moment accessible frequency set, compares the T moment accessible frequency set with the T-1 moment accessible frequency set to generate a T moment and T-1 moment accessible frequency set difference value, updates a frequency hopping list decision function module, and simultaneously encrypts the T moment and T-1 moment accessible frequency set difference value information to obtain frequency set difference value encryption information; checking whether a link exists between a calling party and a called party, if so, sending the frequency set difference value encryption information through the link, and if not, sending the frequency set difference value encryption information through a virtual signaling channel;
after receiving the frequency set difference value encryption information, the called party decrypts the information to obtain a difference value of the accessible frequency set at the T moment and the T-1 moment, and updates the frequency hopping list decision function module;
the calling party and the called party adopt the new accessible frequency set to continue communication or initiate a new call attempt;
the frequency hopping list decision function module executes the following procedures:
after receiving the difference value of the enabled frequency set between the T moment and the T-1 moment, the calling party frequency hopping list decision function module analyzes the T-1 moment frequency hopping list, generates a T moment frequency hopping list according to a frequency hopping decision algorithm, compares the T moment frequency hopping list with the T-1 moment frequency hopping list, generates the difference value and the validity period of the T moment frequency hopping list and the T-1 moment frequency hopping list, updates an encryption key decision module, simultaneously encrypts the difference value and the validity period information of the T moment frequency hopping list and the T-1 moment frequency hopping list, records the encryption information as frequency hopping encryption information, checks whether a link exists between a calling party and a called party, and if the link exists, the frequency hopping encryption information is sent through the link, and if the link does not exist, the frequency hopping encryption information is sent through a virtual signaling channel;
after receiving the frequency hopping encryption information, the called party decrypts the information to obtain the difference value and the validity period of the T and T-1 time frequency hopping lists, generates a T time frequency hopping list and updates an encryption key decision module;
the encryption key decision function module executes the following procedures:
after receiving the difference value and the validity period of the frequency hopping list at the T moment and the T-1 moment, the calling party encryption key decision module analyzes a T-1 moment key set, generates a T moment key set according to a key decision algorithm, compares the T moment key set with the T-1 moment key set, generates a T and T-1 moment key set difference value and validity period, updates a backup channel decision module, simultaneously encrypts T and T-1 moment key set difference values and validity period information, records the encrypted information as key encryption information, checks whether a link exists between a calling party and a called party, sends the key encryption information through the link if the link exists, and sends the key encryption information through a virtual signaling channel if the link does not exist;
after receiving the key encryption information, the called party decrypts the key encryption information to obtain the difference value and the validity period of the key set at the T moment and the T-1 moment, generates a key set at the T moment and updates the backup channel decision module;
the backup channel decision function module executes the following procedures:
after receiving the difference value between the key set at the time T and the key set at the time T-1 and the validity period, the calling party backup channel decision module checks whether a link exists between a calling party and a called party, if the link exists, the calling party backup channel decision module keeps a standby service channel idle, if the link does not exist, the calling party backup channel decision module occupies the standby service channel, namely a satellite link, generates a link recovery instruction, updates the accessible frequency set decision function module, simultaneously executes encryption of link recovery instruction information, records the link recovery instruction information as link encryption information, and sends the link recovery information through the standby channel; continuously using the standby service channel, sending and receiving basic service information, and keeping the service smooth;
and after receiving the link encryption information, the called party decrypts the link encryption information to obtain a link recovery instruction, updates the accessible frequency set decision function module, continues to use the standby service channel, sends and receives basic service information and keeps the service smooth.
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