CN108924909B - Short wave rapid frequency selection link establishment method - Google Patents
Short wave rapid frequency selection link establishment method Download PDFInfo
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Abstract
The invention discloses a short wave rapid frequency selection link establishment method, which comprises the following steps that a calling station continuously sends Protocol Data Units (PDU) on the same frequency, and called stations switch in turn on different frequencies to realize protocol PDU receiving and analysis; when power-on initialization is carried out, the communication frequency set resets the time, detection bulletins are automatically triggered to intervene in frequency selection link establishment when the day and night alternate and single link establishment is unsuccessful, the link establishment process is completed through a call request and frequency confirmation, and the call request carries recommended frequency set signal-to-noise ratio sequencing information so that two communication parties can search the optimal service communication frequency in the shortest time; recording the successful frequency pair of link establishment, and preferentially adopting the next communication; the invention adopts a plurality of frequencies for parallel processing, the process of receiving protocol PDU is changed from a serial mode to a parallel mode, and the frequency selection time is reduced; the detection process is automatically involved in the frequency selection process, the optimal receiving frequency set and the optimal transmitting frequency set are obtained and are recommended mutually, and the link establishment speed and the link establishment success rate are improved.
Description
Technical Field
The invention relates to the research field of short wave communication, in particular to a short wave rapid frequency selection link establishment method.
Background
Short-wave communication realizes long-distance communication through ionospheric reflection. Due to the change of the height and the density of the ionized layer at any moment, the short-wave communication stability is poor, and the fixed communication frequency cannot be adopted for service communication. The communication frequency can change at any time along with factors influencing the state of the ionosphere, such as climate, longitude and latitude, sun and black seeds and the like. Therefore, the short-wave communication process is generally divided into two steps of frequency selection and link establishment and service transmission: the main purpose of frequency selection and link establishment is to complete the selection of the transmission frequency for transceiving between two communication points and the confirmation of the type of service to be carried out. The traffic transmission is the completion of acknowledged data or voice traffic on the selected transmission frequency.
At present, the military and civil short-wave communication in China widely adopts a full-military short-wave third-generation automatic link establishment technology (according to the standard GJB 2077A-2007). The common point-to-point frequency selection link establishment Protocol comprises three processes of link establishment (frequency selection), service establishment (service confirmation) and scanning detection (frequency optimization), and Protocol message interaction is carried out through a Protocol Data Unit (PDU).
The prior art has the following disadvantages:
for the link establishment procedure: by the formula (1) [ (communication frequency number + 1)' x scan listening time + 2x scan listening time ]/scan call PDU time, it can be seen that the time taken for scan call is closely related to the communication frequency number. In order to ensure good communication effect, short-wave communication usually selects 32 communication frequencies within the short-wave accessible frequency band of 6MHz for communication attempt. The existing protocol is adopted for communication, the scanning monitoring time is 1.5 seconds, the scanning calling time is 1.2 seconds, and the time for completing one round of scanning calling can be obtained by a formula as follows:
(32+1) × 1.5+2 × 1.5 ═ 52.5 seconds. Assuming that the subsequent traffic handshake and establishment process can be successful at one time, at least 52.5+6 × 1.4 ═ 60.9 seconds are required to complete a link establishment process. In practice, the time taken is generally longer due to the instability of short-wave communications.
(II) for the service establishment process: and if the two communication parties do not carry out good-quality sequencing on the service frequency set Q through the scanning detection process in advance. With the frequency strategy of the prior protocol, in practice, the link establishment needs a plurality of attempts to find the communicable frequency, which takes too long link establishment time, and because the frequency is not the optimal frequency, the problem of poor service communication effect after the link establishment occurs.
(III) for the scanning detection process: in order to ensure the communication effect, a user often selects a scanning probe call to sequence a service frequency set, and then initiates a service establishment process again. The premise of the scanning detection process is to complete the link establishment process first, so that not only manual intervention of a user is required, but also the link establishment process is completed through four processes of link establishment, scanning detection, link establishment and service establishment, and additional time overhead is increased.
And (IV) the communication frequency set, the calling frequency set and the service frequency set are manually preset, and due to instability of short-wave communication and limitation of manual experience, the effect of manually set frequency communication is not ideal in many cases. In practical application, the link establishment success rate can only reach 65% level, and the user experience effect is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a short wave rapid frequency selection link establishment method, which can effectively shorten the frequency selection time and improve the link establishment success rate.
The purpose of the invention is realized by the following technical scheme:
a short wave fast frequency selection link establishment method comprises the following steps:
the protocol operation process comprises detection bulletins and frequency selection link establishment, namely, during power-on initialization, the moment of resetting a communication frequency set, automatically triggering the detection bulletins when the communication frequency set alternates day and night and when single link establishment is unsuccessful, then intervening in the frequency selection link establishment, completing the link establishment process through a call request and frequency confirmation, and simultaneously carrying recommended frequency set R signal-to-noise ratio sequencing information by a protocol call request PDU (protocol data Unit), so that both communication parties can be guaranteed to search for the optimal service communication frequency in the shortest time; and recording the successful link establishment frequency pair, and preferentially adopting the successful link establishment frequency pair in the next communication.
The method specifically comprises the following steps: firstly, a calling station a continuously sends a plurality of protocol PDUs on the same frequency, and a called station b alternately switches on different frequencies in a communication frequency set to realize protocol PDU receiving and analysis;
in the protocol operation process, the protocol operation process comprises detection bulletins and frequency selection link establishment, namely, when power-on initialization is carried out, the communication frequency set resets the moment, when the day and night alternate and single link establishment is unsuccessful, the detection bulletins are automatically triggered, then the frequency selection link establishment is intervened, the link establishment process is completed through a call request and frequency confirmation, and meanwhile, a protocol call request PDU carries recommended frequency set R signal-to-noise ratio sequencing information to ensure that both communication parties search the optimal service communication frequency in the shortest time; and recording the successful link establishment frequency pair, and preferentially adopting the successful link establishment frequency pair in the next communication.
Further, the protocol PDU receiving and analyzing process includes:
s1, setting a center frequency and a working bandwidth by a broadband receiver unit of the carrier device according to a short-wave communication frequency change rule, and carrying out digital sampling on a received radio frequency analog signal through an analog-to-digital converter in the unit to obtain a digital sampling signal;
s2, the digital sampling signal passes through a low-pass filtering unit for extracting 16 times to obtain the down-sampling rate of the digital sampling signal, and the down-sampling extraction process of the digital sampling signal is completed;
s3, channelizing by adopting a multi-item filtering technology, dividing the digital sampling signals into M communication frequencies at equal intervals by taking the center frequency of a broadband receiving unit as a center, wherein each communication frequency corresponds to one path of digital sampling signals, and the adoption rate of the digital sampling signals is N;
s4, reading a built-in short wave communication experience database by taking the current time and the center frequency as indexes, acquiring a current experience communication frequency set F, selecting K paths of digital sampling signals from the equidistant digital sampling signals, and respectively inputting the K paths of digital sampling signals to an arithmetic unit and digital sampling signal demodulation equipment;
s5, the operation unit performs energy estimation operation on the input digital sampling signals, selects continuous 512 digital sampling point values in the digital sampling signals of the current path, obtains an energy estimation value through complex square root summation calculation, preferentially recommends the communication frequency corresponding to the digital sampling signal with the minimum energy value to the opposite side as a calling frequency, selects L paths of digital sampling signals with better noise in the K paths of digital sampling signals through sorting, and forms a subset of an empirical communication frequency set F: recommended call frequency set G
Further, the digital sampling signal is down-sampled at a rate of 4.9152 MHz;
further, the equal interval is 19.2 KHz;
further, M is 256;
further, the sampling rate N of the digital sampling signal is 19.2 KHz;
further, K is 32;
further, said L is 8;
further, the recommended call frequency set G is sorted from low to high according to the background noise, and the lowest recommended call frequency set G is at the initial position;
further, the detection announcement specifically includes:
y1, continuously performing background noise detection on the calling station a and the called station b, and updating local recommended calling frequency sets Ga and Gb corresponding to the calling station a and the called station b in real time;
y2, configuring a unique detection announcement calling station for each subnet through user configuration, and when the detection announcement is entered, automatically sending detection announcement PDU in sequence by the calling station a by using the current experience communication frequency set F to complete the transmission of the local recommended call frequency set Ga;
y3, when the called station b receives the detecting announcement PDU, the signal-to-noise ratio evaluation is carried out on each communication frequency of the current experience communication frequency set F, and according to the signal-to-noise ratio evaluation result, better 8 communication frequencies are selected for storage and are recommended to the receiving frequency set Ra of the calling station a;
y4, after waiting for the main paging station to detect and announce the time slot to end, the called station b uses the current experience communication frequency set F to send the detection response PDU in turn, and finishes the transmission of the local recommended calling frequency set Gb;
y5, when the calling station a receives the detection response PDU, the signal-to-noise ratio evaluation is carried out on each communication frequency of the current experience communication frequency set F, and according to the signal-to-noise ratio evaluation result, better 8 communication frequencies are selected for storage and recommended to the receiving frequency set Rb of the called station b;
y6, point-to-point detection mode, the calling station a and the called station b through 32 times of detection announcement PDU and detection response PDU, the calling station a obtains and stores the local recommended calling frequency set Gb of the chain establishment of the called station b and the receiving frequency set Rb recommended to the called station b, and the called station b obtains and stores the local recommended calling frequency set Ga of the chain establishment of the calling station a and the receiving frequency set Ra recommended to the calling station a;
further, the detection announcement PDU includes a local number, time information, a recommended call frequency, and a recommended call frequency ranking;
further, the detection response PDU comprises a local number, time information, a recommended calling frequency and a recommended calling frequency sequence;
further, the frequency selecting and chain building specifically includes:
z1, when the calling station a starts to initiate the chain establishment, it needs to read the local recommended calling frequency set Gb for the chain establishment of the called station b and the receiving frequency set Rb recommended to the called station b, selects the first frequency fgb1 from the local recommended calling frequency set Gb of the chain establishment to initiate a call request PDU, and waits for whether the next PDU time slot can receive the frequency confirmation PDU of the called station b;
z2, called station b receives calling request PDU of calling station a, according to the analyzed service type, carries on SNR evaluation to the transmitting frequency of calling station a, judges whether the SNR of the transmitting frequency of calling station a meets the service requirement, if it meets the service requirement, the frequency confirms that the next calling frequency that PDU recommends to calling station a is still fgb1, and adds 1 to the frequency affirming sign; if the service requirement is not met, the recommended next calling frequency is the first frequency fra1 of the receiving frequency set Ra of the calling station a, and the frequency confirmation flag is set to be 0; when the calling station a waits for the confirmation time slot, namely the calling station a waits for receiving the frequency confirmation of the called station b, the called station b uses the calling frequency frb1 analyzed in the calling request PDU to send the frequency confirmation PDU of the called station b;
z3, if the calling station a receives the frequency confirmation PDU of the called station b in the waiting confirmation time slot, the signal-to-noise ratio evaluation is carried out on the transmitting frequency frb1 of the called station b according to the initiated service type, if the service requirement is met, the next calling frequency recommended to the called station b is still frb1, and the frequency confirmation mark is added with 2; if the frequency does not meet the service requirement, the next calling frequency recommended to the called station is the second frequency frb2 of the receiving frequency set Rb of the called station b, the frequency confirmation identifier is kept unchanged, and the calling station a obtains the calling frequency to be adopted by the frequency confirmation of the called station b by analyzing the frequency confirmation PDU of the called station b and sends the frequency confirmation PDU of the calling station a;
z4, in the waiting confirmation time slot, when the calling station does not receive the frequency confirmation PDU of the called station, selecting a second frequency fgb2 from the local recommended calling frequency set Gb of the building chain as the transmitting frequency to initiate the call request PDU again, and a second frequency frb2 of the receiving frequency set Rb of the called station b continues to repeat the call request process, when the calling station a finishes traversing the local recommended calling frequency set Gb of the building chain and still does not receive the frequency confirmation PDU of the called station b, the local calling and receiving frequency sets are considered to be unavailable, and automatically entering a probing announcement process to update the local recommended calling frequency sets Ga and Gb and the corresponding receiving frequency sets Ra and Rb corresponding to the calling station a and the called station b;
z5, when the frequency confirmation flag of the calling station a after frequency evaluation is set to 3, then the calling station a and the called station b have found a pair of frequencies capable of service communication: the service transmitting frequency of the calling station a is one of the transmitting frequency fgbn or fran recommended by the called station b, the service receiving frequency is the transmitting frequency frbn recommended to the called station b, and the PDU time slot is confirmed at the next frequency, the updated frequency confirmation mark is transmitted to the opposite side by using the calling frequency recommended by the called station b, then the service waiting state is entered, the calling station a successfully establishes the link, and the value range of n is as follows: 1 to 8;
when the called station b receives the frequency confirmation mark of the calling station a as 3, the service communication frequency of the called station b is confirmed: the service transmitting frequency is the transmitting frequency frbn recommended by the calling station a, the service receiving frequency is the transmitting frequency fgbn or fran recommended to the calling station, then the station enters a service waiting state, and the called station b successfully establishes a link;
when the frequency confirmation mark is not analyzed to be 3, the calling station a and the called station b sequentially update the calling frequency recommended to the other party according to the local recommended calling frequency sets Ga and Gb corresponding to the calling station a and the called station b, and the frequency confirmation process is continued until the link is successfully established or the local recommended calling frequency sets traverse and then enter the detection announcement process;
z6, when successfully entering into service waiting state, recording the receiving and transmitting frequency, time and number information of successfully establishing link, forming database file by using the opposite side number as index, when establishing link by frequency selection next time, obtaining historical experience receiving and transmitting frequency pair from database: the method comprises the steps that the transmitting frequency fg and the receiving frequency fr preferentially use the fg to recommend fr to the other side so as to improve the link establishment speed and the success rate;
further, the call request PDU contains the local number, called number, service type and calling frequency recommended to the called station b;
furthermore, the frequency confirmation PDU of the called station b comprises a local number, a calling number, a frequency confirmation mark and the next calling frequency recommended to the calling station a;
further, the frequency confirmation PDU of the calling station a comprises a local number, a called number, a frequency confirmation mark and the next calling frequency recommended to the called station.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention adopts the parallel processing capability of a plurality of frequencies, the process of receiving the protocol PDU is changed from a serial mode to a parallel mode, and the frequency selection time is greatly reduced;
2. according to the method, manual intervention is not needed in the detection process, the frequency selection process is automatically intervened according to the frequency characteristics of short-wave communication, the optimal receiving frequency set and the optimal transmitting frequency set are obtained through the detection process and are recommended mutually, the frequency trying process is not needed, and the link establishment speed and the link establishment success rate are improved;
3. the invention can record the successful link establishment frequency pair of the two communication parties, and preferentially adopts the recorded successful link establishment frequency pair in the next communication, thereby improving the success rate of communication.
Drawings
FIG. 1 is a flow chart of a protocol PDU receiving and analyzing implementation of the short wave fast frequency-selecting link establishment method according to the present invention;
FIG. 2 is a flow chart of a point-to-point probe advertisement of the short wave fast frequency selecting link establishment method according to the present invention;
fig. 3 is a point-to-point frequency selection link establishment flow chart of the short wave fast frequency selection link establishment method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example (b):
a short wave fast frequency selection link establishment method comprises the following steps:
firstly, a calling station a continuously sends a plurality of protocol PDUs on the same frequency, and a called station b alternately switches on different frequencies in a communication frequency set to realize protocol PDU receiving and analysis;
in the protocol operation process, the protocol operation process comprises detection bulletins and frequency selection link establishment, namely, when power-on initialization is carried out, the communication frequency set resets the moment, when the day and night alternate and single link establishment is unsuccessful, the detection bulletins are automatically triggered, then the frequency selection link establishment is intervened, the link establishment process is completed through a call request and frequency confirmation, and meanwhile, a protocol call request PDU carries recommended frequency set R signal-to-noise ratio sequencing information to ensure that both communication parties search the optimal service communication frequency in the shortest time; and recording the successful link establishment frequency pair, and preferentially adopting the successful link establishment frequency pair in the next communication.
In the aspect of protocol PDU receiving and analyzing, the existing protocol is designed based on the premise of narrow-band receiving equipment (3KHz bandwidth). The called station can only receive and demodulate the protocol PDU information of one frequency in any monitoring time slot under the restriction of equipment. In order to realize the link establishment process, the calling station needs to continuously transmit a plurality of protocol PDUs on the same frequency, and the called station needs to switch in turn on different frequencies in the communication frequency set. The protocol of the invention adopts carrier broadband receiving equipment (6MHz bandwidth), uses polyphase filtering and multichannel demodulation technology, called station b can demodulate 32 protocol PDU information of different communication frequencies at any moment, called station b does not need to switch frequency in the monitoring process, calling station a only needs to use different calling frequencies to send a protocol calling request PDU in the calling process, thus the protocol can finish the link establishment process at the fastest speed only by calling station a calling request and called station b calling and answering two protocol PDU time, 2x1.4 is 2.8 seconds, in order to realize the rapid link establishment process, local noise evaluation mechanism is needed to optimize calling frequency set of the calling station, the broadband receiving protocol realizing flow is shown in figure 1, and the concrete realizing steps are as follows:
1. a broadband receiver unit of the carrier equipment performs digital sampling on radio frequency analog signals in a short wave frequency band, sets the central frequency of the broadband receiver unit through a protocol, and completes the frequency mixing process of digital sampling signals so as to realize the frequency spectrum shifting from radio frequency to zero frequency of any 6MHz bandwidth signal in the short wave communication frequency band of 1.6-30 MHz;
2. the process of extracting and down-sampling the signal is finished through three-level low-pass filtering, and the rate of the down-sampled digital sampling signal is 4.9152 MHz;
3. and channelizing by adopting a multi-item filtering technology, and equally dividing the digital sampling signal with the bandwidth of 6MHz into 256 communication frequencies with the bandwidth of 3KHz at intervals of 19.2KHz by taking the central frequency of the broadband receiving unit as the center. Each communication frequency corresponds to a path of digital sampling signal, and the sampling rate of the digital sampling signal is 19.2 KHz;
4. the protocol reads a built-in short wave communication experience database by taking the current time and the center frequency as indexes to obtain a current experience communication frequency set F { F1, F2, … and F32}, selects corresponding 32 paths of digital sampling signals from 256 paths of digital sampling signals and respectively inputs the digital sampling signals to a protocol operation unit and digital sampling signal demodulation equipment.
5. The protocol arithmetic unit performs energy estimation operation on the transmitted signal. The communication frequency corresponding to the digital sampling signal with the small energy value has low local receiving noise and can be preferentially recommended to the other party as the calling frequency. And finally, selecting 8 paths of signals with the best bottom noise in 32 paths through sequencing to form a subset of an empirical communication frequency set F: recommending a calling frequency set G { fg1, fg2, …, fg8}, ordering from low to high noise floor, low at the start position;
6. the digital sampling signal demodulation equipment adopts a double FPGA + DSP structure, and can carry out real-time parallel demodulation on 32 paths of input digital sampling signals by utilizing a multi-channel demodulation technology so as to ensure that a protocol can obtain protocol PDU analysis information of any communication frequency of a frequency set at any time.
Therefore, compared with the existing protocol, the receiving process of the method is changed from a serial mode to a parallel mode, the link establishment time is greatly shortened, and because a local noise evaluation mechanism is added, both communication parties can obtain the recommended call frequency set G in real time, and the link establishment effect is improved.
In the aspect of protocol operation process, according to the short-wave communication frequency change characteristic: the change between the day and the night is slow, the pair of service optimization frequencies can be continuously used for several hours without detecting the optimization again; the day and night alternating time changes violently, is influenced by the change of an ionized layer, the frequency selective fading violently optimizes the frequency duration not long, and the frequency selection process needs to be detected. In a protocol frame, the detection frequency selection process can automatically intervene in a link establishment process at the equipment power-on initialization moment, the communication frequency set resetting moment, the day and night alternate change moment and the single link establishment unsuccessful moment, normally, only a call request is needed, the frequency confirms the fastest three PDU time slots to complete the link establishment process, and meanwhile, the protocol call request PDU carries recommended frequency set R signal-to-noise ratio sequencing information to ensure that two communication parties search the optimal service communication frequency in the shortest time.
The protocol framework is divided into two stages of detection announcement and frequency selection link establishment, the protocol operation flow of the point-to-point detection announcement stage is shown in fig. 2, and the detection announcement stage specifically comprises the following implementation steps:
1. after the mobile terminal is started, both communication sides continuously carry out background noise monitoring through a broadband receiving protocol, and update local recommended call frequency sets Ga { fga1, fga2, …, fgaL } and Gb { fgb1, fgb2, …, fgbL } in real time;
2. through user configuration, each subnet is equipped with a unique detection announcement calling station, and at the time of entering the detection announcement, the calling station a uses the currently set communication frequency set F to automatically send detection announcement PDU (including local number, time information, recommended calling frequency and sequencing) in turn. Since the PDUs carry limited information, each PDU can carry only 2 call frequency information. The transmission of the entire call frequency set Ga can only be realized by 4 PDUs. And then, the call frequency set Ga is repeatedly transmitted by taking 4 PDUs as a group, and the receiving integrity of the other party can be basically ensured through 8 times of repeated transmission of 32 frequencies.
3. The station b, being called, can perform the snr evaluation for each frequency of the communication frequency set F { F1, F2, …, F32} while receiving the probe announcement. According to the good and bad sequence of the signal-to-noise ratio, the first 8 frequencies selected by the called station are stored as a receiving frequency set Ra { fra1, fra2, … and fra8} recommended to the calling station a;
4. after waiting for the end of the main paging station detection announcement time slot, the called station b uses the communication frequency set F to sequentially send detection response PDU (including the local number, time information, recommended calling frequency and sequencing). Completing the transmission of a recommended calling frequency set Gb through 8 times of repetition of 32 frequencies as a calling station;
5. the caller station a receives the probe response and performs the signal-to-noise ratio evaluation on each frequency of the communication frequency set F { F1, F2, …, F32 }. According to the sequence of good and bad signal-to-noise ratio, the first 8 frequencies selected by the calling station are stored as a set Rb { frb1, frb2, … and frb8} recommended to the called station b for receiving;
6. in the point-to-point probing mode, the two stations advertise and respond back and forth 32 times (total 32 × 2 × 1.4 ═ 89.6G), the calling station a can obtain and store the set Gb of call frequencies and the set Rb of recommended reception frequencies for the called station b, and the called station b can obtain and store the set Ga of call frequencies and the set Ra of recommended reception frequencies for the calling station a, and the probing advertising phase is completed.
In the phase of frequency selection and link establishment, the method comprises two steps of call request and frequency confirmation, and the specific implementation process is as follows:
1. when the calling station a starts to initiate a set-up, the set-up calling frequency Gb and the set of recommended receiving frequencies Rb for the called station b are first read. Selecting a first frequency fgb1 from the set of link establishing frequencies Gb to initiate a call request PDU: carrying the local number, called number, service type and calling frequency recommended to called station b: the first frequency frb1 of frequency set Rb is received, and then waits for the next PDU slot to see if the frequency acknowledgment PDU for the called station b can be received.
2. The call request PDU received by the called station b from the calling station a performs the snr evaluation of the transmitting frequency fgb1 of the calling station a according to the analyzed service type. Judging whether the signal-to-noise ratio of the frequency received by the station meets the service requirement: if the requirement is met, the frequency confirmation PDU recommends to the calling station a to call the frequency again, which is still fgb1, and adds 1 to the frequency confirmation mark; otherwise, the recommended next call frequency is the first frequency fra1 of the local receiving frequency set Ra, and the frequency confirmation flag is set to 0. When the subsequent caller waits for an acknowledgment slot, callee b will send a frequency acknowledgment PDU using the call frequency frb1 resolved in the call request PDU: the calling station carries the local number, calling number, frequency confirmation mark and next calling frequency recommended to the calling station a.
3. If the calling station a receives the frequency confirmation PDU of the called station b in the waiting confirmation time slot, the signal-to-noise ratio evaluation is carried out to the transmitting frequency frb1 of the called station b according to the initiated service type. If the service requirement is met, recommending that the frequency of the next calling to the called station b is still frb1, and adding 2 to the frequency confirmation mark; otherwise, the recommended next call frequency is the second frequency frb2 of the local receive frequency set Rb, and the frequency confirmation flag remains unchanged. Transmitting the frequency confirmation PDU of the calling station a by resolving the frequency confirmation PDU of the called station b to obtain the calling frequency fgb1 or fra1 to be used by the next time slot: the mobile phone carries the local number, called number and frequency confirmation mark and recommends the next calling frequency to the called station.
4. In the waiting confirmation time slot, if the calling station a does not receive the frequency confirmation PDU of the called station b, the second frequency fgb2 is selected from the set Gb as the transmitting frequency to initiate the call request PDU again: carrying the local number, called number, service type and the next calling frequency recommended to the called station: a second frequency frb2 of frequency set Rb is received and the call request process continues to be repeated. And when the calling station does not receive the frequency confirmation PDU of the called station b after traversing the link establishment frequency set Gb, the current local calling and receiving frequency sets are considered to be unavailable, and the calling station automatically enters a detection announcement process to update the local calling frequency set G and the receiving frequency set R of the two parties.
5. When the calling station a sets the frequency confirmation flag after frequency evaluation to 3, it indicates that the two communication parties have found a pair of available service communication frequencies: the service transmitting frequency of the calling station a is one of the transmitting frequencies fgbn, n {1,2, …,8} or fran, n {1,2, …,8} recommended by the calling station b. The service reception frequency is the transmission frequency frbn, n {1,2, …,8} recommended to the called station b. And will confirm PDU time slot in the next frequency, use the call frequency that is recommended by the station b of calling and confirm the mark to transmit the frequency after the renewal to the other side, will enter the waiting state of the business afterwards, the main calling station a builds the link successfully.
6. When the called station b receives the frequency confirmation mark of the calling station a as 3, the service communication frequency of the called station b is confirmed: the service transmitting frequency is the recommended transmitting frequency frbn, n {1,2, …,8} of the calling station a, and the service receiving frequency is the recommended transmitting frequency fgbn, n {1,2, …,8} or fran, n {1,2, …,8} of the calling station. Then enters into service waiting state, and the called station b successfully establishes the link.
7. When the frequency confirmation flag is not analyzed to be 3, the calling station a and the called station b will sequentially update the calling frequency recommended to the other party according to the sequence of the local calling frequency set, and the frequency confirmation process is continued. And entering a detection and announcement process until the link is successfully established or the local frequency set traverses.
8. After successfully entering the service waiting state, the protocol records the transceiving frequency, time and number information of the successfully established link and forms a database file by taking the number of the opposite party as an index. At the next time of selecting frequency and building a link, the protocol obtains historical empirical transmit-receive frequency pairs from the database: the transmission frequency fg and the reception frequency fr preferably use fg to recommend fr to the other party so as to improve the link establishment speed and the success rate, and the point-to-point frequency selection link establishment flow is shown in fig. 3.
Through practical application statistics, the average link establishment success rate of the method is 95% under 32 communication frequency sets, and the link establishment time is 9 seconds. Is far superior to the current level.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. A short wave fast frequency selection link establishment method is characterized by comprising the following steps:
firstly, a calling station a continuously sends more than one protocol PDU (protocol data unit) on the same frequency, and a called station b alternately switches on different frequencies in a communication frequency set to realize protocol PDU receiving and analysis;
the protocol PDU receiving and analyzing process comprises the following steps:
s1, setting a center frequency and a working bandwidth by a broadband receiver unit of the carrier device according to a short-wave communication frequency change rule, and carrying out digital sampling on a received radio frequency analog signal through an analog-to-digital converter in the unit to obtain a digital sampling signal;
s2, the digital sampling signal passes through a low-pass filtering unit for extracting 16 times to obtain the down-sampling rate of the digital sampling signal, and the down-sampling extraction process of the digital sampling signal is completed;
s3, channelizing by adopting a multi-item filtering technology, dividing the digital sampling signals into M communication frequencies at equal intervals by taking the center frequency of a broadband receiving unit as a center, wherein each communication frequency corresponds to one path of digital sampling signals, and the sampling rate of the digital sampling signals is N;
s4, taking the current time and the center frequency of the broadband receiving unit as indexes, reading a built-in short wave communication experience database, obtaining a current experience communication frequency set F { F1, F2, …, fK }, selecting K paths of digital sampling signals from the equidistant digital sampling signals, and respectively inputting the K paths of digital sampling signals to an arithmetic unit and digital sampling signal demodulation equipment;
s5, the operation unit performs energy estimation operation on the input digital sampling signals, selects continuous 512 digital sampling point values in the digital sampling signals of the current path, obtains an energy estimation value through complex square root summation calculation, preferentially recommends the communication frequency corresponding to the digital sampling signal with the minimum energy value to the opposite side as a calling frequency, selects L paths of digital sampling signals with better noise in the K paths of digital sampling signals through sorting, and forms a subset of a current experience communication frequency set F: a recommended call frequency set G { fg1, fg2, …, fgL };
in the protocol operation process, the protocol operation process comprises detection bulletins and frequency selection link establishment, namely, when power-on initialization is carried out, the communication frequency set resets the moment, when the day and night alternate and single link establishment is unsuccessful, the detection bulletins are automatically triggered, then the frequency selection link establishment is intervened, the link establishment process is completed through a call request and frequency confirmation, and meanwhile, a protocol call request PDU carries recommended frequency set R signal-to-noise ratio sequencing information to ensure that both communication parties search the optimal service communication frequency in the shortest time; and recording the successful link establishment frequency pair, and preferentially adopting the successful link establishment frequency pair in the next communication.
2. The shortwave fast frequency-selecting link establishment method according to claim 1, wherein the center frequency includes a daytime center frequency and a nighttime center frequency; the daytime center frequency is 9 MHz; the night center frequency is 6 MHz; the operating bandwidth is 6 MHz.
3. The short wave fast frequency selection link building method according to claim 1, wherein the equal spacing interval is 19.2 KHz; m is 256; the adoption rate N of the digital sampling signal is 19.2 KHz; the digital sampling signal is down sampled at a rate of 4.9152 MHz.
4. The shortwave fast frequency-selecting chain-building method according to claim 1, wherein K is 32; the L is 8; and the recommended calling frequency set G is sorted from low to high according to the background noise, and the lowest recommended calling frequency set G is at the initial position.
5. The short-wave fast frequency-selecting link establishment method according to claim 1, wherein the detection announcement specifically includes:
y1, continuously performing background noise detection on the calling station a and the called station b, and updating local recommended calling frequency sets Ga { fga1, fga2, …, fgaL } and Gb { fgb1, fgb2, …, fgbL } corresponding to the calling station a and the called station b in real time;
y2, configuring a unique detection announcement calling station for each subnet through user configuration, and when the detection announcement is entered, automatically sending detection announcement PDU in sequence by the calling station a by using the current experience communication frequency set F to complete the transmission of the local recommended call frequency set Ga;
y3, when receiving the detecting announcement PDU, the called station b carries out signal-to-noise ratio evaluation to each communication frequency in the current experience communication frequency set F, selects better first 8 communication frequencies to store according to the signal-to-noise ratio evaluation result, and recommends the receiving frequency set Ra { fra1, fra2, …, fra8} to the calling station a;
y4, after waiting for the main paging station to detect and announce the time slot to end, the called station b uses the current experience communication frequency set F to send the detection response PDU in turn, and finishes the transmission of the local recommended calling frequency set Gb;
y5, when the calling station a receives the detection response PDU, the signal-to-noise ratio evaluation is carried out on each communication frequency of the current experience communication frequency set F, and according to the signal-to-noise ratio evaluation result, the better first 8 communication frequencies are selected for storage and recommended to the receiving frequency set Rb { frb1, frb2, …, frb8} of the called station b;
y6, point-to-point probing mode, wherein the calling station a and the called station b obtain and store the local set Gb of recommended calling frequencies and the set Rb of receiving frequencies recommended to the called station b by 32 times probing announcement PDU and probing response PDU, and the called station b obtains and stores the local set Ga of recommended calling frequencies and the set Ra of receiving frequencies recommended to the calling station a.
6. The shortwave fast frequency-selecting link-building method according to claim 5, wherein the probe advertisement PDU contains local number, time information, recommended call frequency, and recommended call frequency ranking.
7. The shortwave fast frequency-selecting link-building method according to claim 5, wherein the probe response PDU contains a local number, time information, recommended call frequency, and recommended call frequency ranking.
8. The short-wave fast frequency-selecting chain establishment method according to claim 1, wherein the frequency-selecting chain establishment specifically comprises:
when the calling station a starts to establish a chain, the Z1 needs to read the local recommended call frequency set Gb { fgb1, fgb2, …, fgbL } of the chain established for the called station b and the receiving frequency set Rb { frb1, frb2, …, frbL } recommended to the called station b, selects the first frequency fgb1 from the local recommended call frequency set Gb fgb1, fgb2, …, fgbL } of the chain established to initiate a call request PDU, and waits for the next PDU if the slot can receive a frequency confirmation PDU of the called station b;
z2, called station b receives calling request PDU of calling station a, according to the analyzed service type, carries on SNR evaluation to the transmitting frequency of calling station a, judges whether the SNR of the transmitting frequency of calling station a meets the service requirement, if it meets the service requirement, the frequency confirms that the next calling frequency that PDU recommends to calling station a is still fgb1, and adds 1 to the frequency affirming sign; if the service requirement is not met, the recommended next calling frequency is the first frequency fra1 of the receiving frequency set Ra { fra1, fra2, … and fraL } of the calling station a, and the frequency confirmation flag is set to 0; when the calling station a waits for the confirmation time slot, namely the calling station a waits for receiving the frequency confirmation of the called station b, the called station b uses the calling frequency frb1 analyzed in the calling request PDU to send the frequency confirmation PDU of the called station b;
z3, if the calling station a receives the frequency confirmation PDU of the called station b in the waiting confirmation time slot, the signal-to-noise ratio evaluation is carried out on the transmitting frequency frb1 of the called station b according to the initiated service type, if the service requirement is met, the next calling frequency recommended to the called station b is still frb1, and the frequency confirmation mark is added with 2; if the frequency does not meet the service requirement, the next calling frequency recommended to the called station is the second frequency frb2 of the receiving frequency set Rb { frb1, frb2, … and frbL } of the called station b, the frequency confirmation identifier is kept unchanged, the calling station a obtains the calling frequency to be adopted by the frequency confirmation sent to the called station by analyzing the frequency confirmation PDU of the called station b, and the frequency confirmation PDU of the calling station a is sent;
z4, in waiting for confirmation time slot, when the calling station does not receive the frequency confirmation PDU of the called station, selecting the second frequency fgb2 as the transmitting frequency to initiate the call request PDU again from the local recommended calling frequency set Gb fgb1, fgb2, …, fgbL of the set, the second frequency frb2 of the receiving frequency set Rb frb1, frb2, …, frbL of the called station b continues the call request process, when the local recommended calling frequency set Gb fgb1, fgb2, …, fgbL of the set is traversed by the calling station a, the local calling and receiving frequency sets are considered unavailable, the automatic probe announcement process updates the local recommended calling frequency sets Ga fga1, fga2, …, Gb fgaL } and { fgb1, 6865, …, fgbL } and the corresponding receiving frequency sets Ga { fga1, fga2, …, Gb fgaL } and { fgb1, 6865, …, fgbL } and the corresponding receiving frequency sets Ra, 1, 599, Ra, 599 a } of the calling station b, …, frbL };
z5, when the frequency confirmation flag of the calling station a after frequency evaluation is set to 3, then the calling station a and the called station b have found a pair of frequencies capable of service communication: the service transmitting frequency of the calling station a is one of the transmitting frequency fgbn or fran recommended by the called station b, the service receiving frequency is the transmitting frequency frbn recommended to the called station b, and the PDU time slot is confirmed at the next frequency, the updated frequency confirmation mark is transmitted to the opposite side by using the calling frequency recommended by the called station b, then the service waiting state is entered, the calling station a successfully establishes the link, and the value range of n is as follows: 1 to 8;
when the called station b receives the frequency confirmation mark of the calling station a as 3, the service communication frequency of the called station b is confirmed: the service transmitting frequency is the transmitting frequency frbn recommended by the calling station a, the service receiving frequency is the transmitting frequency fgbn or fran recommended to the calling station, then the station enters a service waiting state, and the called station b successfully establishes a link;
when the frequency confirmation mark is not analyzed to be 3, the calling station a and the called station b sequentially update the calling frequency recommended to the other party according to the local recommended calling frequency sets Ga { fga1, fga2, …, fgaL } and Gb { fgb1, fgb2, … and fgbL } corresponding to the calling station a and the called station b, and the frequency confirmation process is continued until the link is successfully established or the local recommended calling frequency set traverses and then enters the detection announcement process;
z6, when successfully entering into service waiting state, recording the receiving and transmitting frequency, time and number information of successfully establishing link, forming database file by using the opposite side number as index, when establishing link by frequency selection next time, obtaining historical experience receiving and transmitting frequency pair from database: the transmitting frequency fg and the receiving frequency fr preferably use fg to recommend fr to the other party so as to improve the speed and the success rate of the link establishment.
9. The shortwave fast frequency-selecting chain-building method of claim 8, wherein the call request PDU includes a local number, a called number, a service type, a call frequency recommended to a called station b; the frequency confirmation PDU of the called station b comprises a local number, a calling number, a frequency confirmation mark and the next calling frequency recommended to the calling station a; the frequency confirmation PDU of the calling station a comprises a local number, a called number, a frequency confirmation mark and the next calling frequency recommended to the called station.
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| CN112135366A (en) * | 2019-06-24 | 2020-12-25 | 鹤壁天海电子信息系统有限公司 | Short wave communication link establishing method, communication system and storage medium |
| CN110636591B (en) * | 2019-10-16 | 2021-06-22 | 中国人民解放军国防科技大学 | Method for quickly selecting frequency and establishing link and transmitting voice service in short wave access network |
| CN110896565B (en) * | 2019-11-20 | 2022-02-08 | 中国电子科技集团公司第三十研究所 | Short wave intelligent channel selection method |
| CN113543363B (en) * | 2020-04-17 | 2023-10-31 | 鹤壁天海电子信息系统有限公司 | Short wave chain building method |
| CN112601292B (en) * | 2020-11-03 | 2023-05-30 | 鹤壁天海电子信息系统有限公司 | Chain building method, communication terminal and computer readable storage medium |
| CN112654057B (en) * | 2020-12-16 | 2023-08-11 | 西安烽火电子科技有限责任公司 | Bandwidth and rate self-adaptive communication method based on channel detection |
| CN114301557B (en) * | 2021-12-16 | 2023-12-29 | 中国人民解放军国防科技大学 | Short wave frequency selection method and system based on combination of predictive data and historical data |
| CN114422051A (en) * | 2021-12-20 | 2022-04-29 | 西安烽火电子科技有限责任公司 | Short wave link establishment method based on Chirp frequency-selecting detection |
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