CN114449456B - Emergency frequency modulation broadcast instruction receiving method - Google Patents

Emergency frequency modulation broadcast instruction receiving method Download PDF

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Publication number
CN114449456B
CN114449456B CN202111589478.9A CN202111589478A CN114449456B CN 114449456 B CN114449456 B CN 114449456B CN 202111589478 A CN202111589478 A CN 202111589478A CN 114449456 B CN114449456 B CN 114449456B
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data
data frame
emergency
instruction
rds
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CN114449456A (en
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王闽
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Fujian Newland Communication Science Technologies Co ltd
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Fujian Newland Communication Science Technologies Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Emergency Management (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Public Health (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

The invention provides an emergency frequency modulation broadcast instruction receiving method in the technical field of emergency broadcasting, which comprises the following steps: s10, monitoring an RSSI value and an SNR value after an emergency broadcast terminal is started; step S20, receiving RDS broadcasting instructions by taking 1 data frame as a unit; s30, checking the number of the data frames; s40, performing CRC on the data frame; s50, performing error code verification on the data frame based on the RDS broadcast instruction copy; step S60, error correction and verification are carried out on the data frames based on the instruction format; step S70, sequentially correcting and checking each data frame through data overturn; step S80, combining the data frames to obtain an RDS broadcast instruction, storing the RDS broadcast instruction as an RDS broadcast instruction copy, and pushing the RDS broadcast instruction to a power amplifier for emergency broadcasting; and step S90, in the emergency broadcasting process, collecting the current value of the power amplifier in real time, and controlling the work of the power amplifier based on the current value. The invention has the advantages that: the RDS broadcasting instruction is corrected, and the emergency broadcasting effect is greatly improved.

Description

Emergency frequency modulation broadcast instruction receiving method
Technical Field
The invention relates to the technical field of emergency broadcasting, in particular to an emergency frequency modulation broadcasting instruction receiving method.
Background
In the transmission coverage network in the technical field of emergency broadcasting, the frequency modulation transmission coverage network (FM-RDS) is an important transmission coverage network, the frequency modulation transmission coverage network transmits through wireless, and meanwhile, the synchronism of audio transmission is good, and compared with a broadcasting channel of digital coding and decoding, the timeliness of the frequency modulation transmission coverage network has obvious advantages. RDS (Radio Data System), a wireless data broadcasting system, is a communication protocol standard for embedding small amounts of digital information in analog fm broadcasts.
However, fm transmission coverage networks suffer from the following drawbacks: 1. the analog signal can only transmit one program, and the transmitted data volume is very small; 2. when the signal intensity is low, obvious background noise exists, and under the condition of outdoor power expansion, the noise is more obvious, so that the noise is disturbing to people; 3. when the signal strength is low, the error rate of the RDS broadcast command (the broadcast command sent over the fm transmission overlay network) is very high, resulting in an emergency broadcast terminal that cannot wake up for a long period of time.
In summary, when the signal strength of the RDS broadcast command is low, the noise floor and the error rate are high, and the amount of data transmitted by the RDS broadcast command is small, so that the emergency broadcast effect is directly affected. Therefore, how to provide a receiving method of emergency frequency modulation broadcast command, to implement error correction of RDS broadcast command, and to improve emergency broadcast effect, is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing an emergency frequency modulation broadcast instruction receiving method for realizing error correction of an RDS broadcast instruction and improving the emergency broadcast effect.
The invention is realized in the following way: an emergency frequency modulation broadcast instruction receiving method comprises the following steps:
step S10, after the emergency broadcast terminal is started, monitoring an RSSI value and an SNR value of a preset frequency point to generate a monitoring result;
step S20, based on the monitoring result, circularly receiving RDS broadcast instructions by taking 1 data frame as a unit;
step S30, carrying out quantity verification on each received data frame;
step S40, performing CRC on each data frame;
s50, performing error code verification on each data frame based on a prestored RDS broadcast instruction copy;
step S60, error correction and verification are carried out on the data frames based on the instruction format of the RDS broadcast instruction;
step S70, sequentially carrying out error correction and verification on each data frame through data inversion;
step S80, combining the data frames to obtain an RDS broadcast instruction, storing the RDS broadcast instruction as an RDS broadcast instruction copy, and pushing the RDS broadcast instruction to a power amplifier for emergency broadcasting;
and step S90, in the emergency broadcasting process, collecting the current value of the power amplifier in real time, and controlling the work of the power amplifier based on the current value.
Further, the step S10 specifically includes:
presetting a frequency point, a first threshold value and a second threshold value, locking the frequency point after the emergency broadcast terminal is started, monitoring the RSSI value and the SNR value of the frequency point, judging whether the RSSI value is larger than the first threshold value and whether the SNR value is larger than the second threshold value, and if so, generating a monitoring result that the signal strength reaches the standard; if not, generating a monitoring result of which the signal strength does not reach the standard.
Further, the step S20 specifically includes:
when the monitoring result shows that the signal strength reaches the standard, circularly receiving an RDS broadcast instruction by taking 1 data frame as a unit;
the RDS broadcasting instruction comprises a plurality of data frames, and the last data frame stores a CRC check value of the RDS broadcasting instruction; 1 said data frame comprising 4 data blocks, 1 said data block comprising 8 bytes; each data block carries a frame number of a data frame and a total frame number.
Further, the step S30 specifically includes:
step S31, judging whether the frame number carried by each data block in each data frame is smaller than or equal to the total frame number, if yes, proceeding to step S32; if not, discarding the corresponding data block;
step S32, judging whether all data frames are received or not based on the total frame number, if yes, entering step S40; if not, the process proceeds to step S20.
Further, the step S40 specifically includes:
after sorting the data frames based on the frame numbers, removing the last data frame to calculate a CRC check value, comparing whether the calculated CRC check value is consistent with the CRC check value carried by the last data frame, if so, indicating that the received data frames are accurate, and entering step S80; if not, it is indicated that each received data frame has an error, and the process proceeds to step S50.
Further, the step S50 specifically includes:
step S51, matching prestored RDS broadcast instruction copies based on the instruction types carried by the data frames, comparing each data block in each data frame with the corresponding data block of the RDS broadcast instruction copy, if 1 byte or 2 bytes are different, indicating that the data block is in error code transmission, replacing the data block with the corresponding data block of the RDS broadcast instruction copy, and entering step S80; otherwise, the data block is indicated to be non-error code transmission, and the step S52 is entered;
step S52, judging whether the transmission times of the data blocks transmitted by the non-error codes exceeds a preset time threshold value, and if the transmission times are the same, entering step S60; if not, the step S20 is carried out, and the corresponding data block is received again.
Further, the step S60 specifically includes:
correcting the error of each data frame based on the instruction format of the RDS broadcast instruction, performing CRC (cyclic redundancy check) on each data frame after error correction, and if the CRC passes, entering step S80; if the CRC check is not passed, the process proceeds to step S70.
Further, the step S70 specifically includes:
step S71, taking the frame numbers as the sequence, taking 1bit, 2bit, 4bit or 8bit as the interval, traversing and turning over each data frame in sequence, performing CRC (cyclic redundancy check) on the turned over data frame, recording the turned-over bit each time, accumulating the error times of each bit, and entering step S72 after the CRC passes;
step S72, based on the error times, turning bits corresponding to the data frame of the next frame preferentially, performing CRC (cyclic redundancy check) on the turned data frame, recording the turned bits each time, accumulating the error times of the bits, and entering step S73 after the CRC passes;
step S73, judging whether CRC (cyclic redundancy check) of all the data frames is completed, if yes, resetting the error times, and proceeding to step S80; if not, the process advances to step S72.
Further, the step S90 specifically includes:
setting a current threshold and a time interval, collecting the current value of the power amplifier in real time in the emergency broadcasting process, judging whether the difference value between the current value and the current value at the last moment is larger than the current threshold or not based on the time interval, if so, indicating that the current value is suddenly changed, and closing the power amplifier; if not, continuing to carry out emergency broadcasting.
Further, the step S20 further includes:
and when the emergency broadcast terminal receives the data frame, the data of the 4 th bit of each data block in the data frame is immediately set to 0.
The invention has the advantages that:
1. and when the received data frames are completely received, CRC check is carried out on the data frames, if the CRC check is not passed, error code check is carried out on the data frames by utilizing an RDS broadcast instruction copy, when the data exceeding the preset quantity is not matched, error correction is carried out on the data frames through an instruction format, if the error is still existed, data in the data frames are subjected to traversing and overturning until the check is passed, namely, the data frames of the RDS broadcast instruction are sequentially subjected to quantity check, CRC check, RDS broadcast instruction copy check, instruction format check and bit overturning check until the check is passed, and the correct RDS broadcast instruction is generated, so that the error correction is carried out on the RDS broadcast instruction, and the emergency broadcast effect is greatly improved.
2. Before receiving an RDS broadcast instruction, the RSSI value and the SNR value of a preset frequency point are monitored, namely, the RDS broadcast instruction is received only under the condition that the signal strength reaches the standard, so that the occurrence of noise and error code caused by low signal strength is avoided; by monitoring the current value of the power amplifier in the emergency broadcasting process, when the current value suddenly changes, the power amplifier is immediately turned off, and the power amplifier is prevented from being broken or broken and damaged due to the sudden change of the current, so that the emergency broadcasting effect is further improved.
3. The correct RDS broadcast instruction is stored as the RDS broadcast instruction copy, so that the new received RDS broadcast instruction is quickly corrected by utilizing the RDS broadcast instruction copy, and the emergency broadcast efficiency is greatly improved.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
Fig. 1 is a flowchart of an emergency fm broadcast command receiving method according to the present invention.
Fig. 2 is a flow chart of an emergency fm broadcast command receiving method according to the present invention.
Detailed Description
According to the technical scheme in the embodiment of the application, the overall thought is as follows: sequentially performing quantity check, CRC check, RDS broadcast instruction copy check, instruction format check and bit flip check on each data frame of the RDS broadcast instruction until the check passes to generate a correct RDS broadcast instruction; by only receiving RDS broadcast instructions under the condition that the signal strength reaches the standard, the generation of bottom noise and error codes due to low signal strength is avoided; the current value of the power amplifier is monitored in the emergency broadcasting process, when the current value suddenly changes, the power amplifier is immediately turned off, the power amplifier is prevented from being broken or broken down and damaged due to the sudden change of the current, the RDS broadcasting instruction is finally corrected, and the emergency broadcasting effect is improved.
Referring to fig. 1 to 2, a preferred embodiment of an emergency fm broadcast command receiving method according to the present invention includes the following steps:
step S10, after the emergency broadcast terminal is started, monitoring an RSSI value (signal strength) and an SNR value (signal to noise ratio) of a preset frequency point to generate a monitoring result;
step S20, based on the monitoring result, circularly receiving RDS broadcast instructions by taking 1 data frame as a unit;
step S30, carrying out quantity verification on each received data frame;
step S40, performing CRC on each data frame;
s50, performing error code verification on each data frame based on a prestored RDS broadcast instruction copy;
step S60, error correction and verification are carried out on the data frames based on the instruction format of the RDS broadcast instruction;
step S70, sequentially carrying out error correction and verification on each data frame through data inversion; i.e., bit-wise (bit) data flip to reverse guess the correct data frame;
step S80, combining the data frames to obtain an RDS broadcast instruction, storing the RDS broadcast instruction as an RDS broadcast instruction copy, and pushing the RDS broadcast instruction to a power amplifier for emergency broadcasting;
because only one CRC check value exists in the RDS broadcast instruction, and the RDS broadcast instruction is circularly transmitted through a data frame, error code can occur when the signal strength is critical, and normal reception is affected, the RDS broadcast instruction is stored as an RDS broadcast instruction copy, and later comparison and verification are facilitated; the instruction types of the RDS broadcast instruction comprise 22 types; each time after the RDS broadcast command verification passes, an old copy of RDS broadcast command is stored based on the command type override.
And step S90, in the emergency broadcasting process, collecting the current value of the power amplifier in real time, and controlling the work of the power amplifier based on the current value.
The method optimizes the reception of the RDS broadcast instruction based on GDJ 085-2018 simulated frequency modulation emergency broadcast technical specification and GDJ089-2018 emergency broadcast big horn system technical specification, improves the reception quality and efficiency of the RDS broadcast instruction, and is compatible with GB-T15770-1995 specification.
The step S10 specifically includes:
presetting a frequency point, a first threshold value and a second threshold value, locking the frequency point after the emergency broadcast terminal is started, monitoring the RSSI value and the SNR value of the frequency point, judging whether the RSSI value is larger than the first threshold value and whether the SNR value is larger than the second threshold value, and if so, generating a monitoring result that the signal strength reaches the standard; if not, generating a monitoring result of which the signal strength does not reach the standard.
The step S20 specifically includes:
when the monitoring result shows that the signal strength reaches the standard, circularly receiving an RDS broadcast instruction by taking 1 data frame as a unit;
the RDS broadcasting instruction comprises a plurality of data frames, and the last data frame stores a CRC check value of the RDS broadcasting instruction; 1 said data frame comprising 4 data blocks, 1 said data block comprising 8 bytes; each data block carries a frame number of a data frame and a total frame number. The frame number is stored in a third byte of the data block and the total frame number is stored in a second byte of the data block.
The step S30 specifically includes:
step S31, judging whether the frame number carried by each data block in each data frame is smaller than or equal to the total frame number, if yes, proceeding to step S32; if not, discarding the corresponding data block;
step S32, judging whether all data frames are received or not based on the total frame number, if yes, entering step S40; if not, the process proceeds to step S20.
The step S40 specifically includes:
after sorting the data frames based on the frame numbers, removing the last data frame to calculate a CRC check value, comparing whether the calculated CRC check value is consistent with the CRC check value carried by the last data frame, if so, indicating that the received data frames are accurate, and entering step S80; if not, it is indicated that each received data frame has an error, and the process proceeds to step S50.
The step S50 specifically includes:
step S51, matching prestored RDS broadcast instruction copies based on the instruction types carried by the data frames, comparing each data block in each data frame with the corresponding data block of the RDS broadcast instruction copy, if 1 byte or 2 bytes are different, indicating that the data block is in error code transmission, replacing the data block with the corresponding data block of the RDS broadcast instruction copy, and entering step S80; otherwise, the data block is indicated to be non-error code transmission, and the step S52 is entered;
step S52, judging whether the transmission times of the data blocks transmitted by the non-error codes exceeds a preset time threshold value, and if the transmission times are the same, entering step S60; if not, entering step S20, and re-receiving the corresponding data block; the number of times threshold is preferably 10.
The step S60 specifically includes:
correcting the error of each data frame based on the instruction format of the RDS broadcast instruction, performing CRC (cyclic redundancy check) on each data frame after error correction, and if the CRC passes, entering step S80; if the CRC check is not passed, the process proceeds to step S70.
For example, the length of the open command is fixed to be 27, when the length of the open command is not 27, the open command is modified to be 27, and then data verification is carried out, and if the verification is not passed, the open/stop type is continuously analyzed; the value of the opening type is as follows: 01: sowing; 10: stopping the broadcasting; after the values are modified to 01 and 10, data verification is carried out, if the verification is not passed, whether the frequency points are switched is continuously analyzed; whether the frequency point is switched is as follows: 01: switching; 10: not switching; and after the modified values are 01 and 10, carrying out data verification, and if the verification is not passed, continuing to verify the information such as event level, event type, emergency broadcast message ID, frequency point information and the like.
The step S70 specifically includes:
step S71, taking the frame numbers as the sequence, taking 1bit, 2bit, 4bit or 8bit as the interval, traversing and turning over each data frame in sequence, performing CRC (cyclic redundancy check) on the turned over data frame, recording the turned-over bit each time, accumulating the error times of each bit, and entering step S72 after the CRC passes;
step S72, based on the error times, turning bits corresponding to the data frame of the next frame preferentially, performing CRC (cyclic redundancy check) on the turned data frame, recording the turned bits each time, accumulating the error times of the bits, and entering step S73 after the CRC passes;
because the bits with errors easily appear are mainly concentrated in a plurality of bits, the error times of each bit are recorded, and the frequently-erroneous bits are overturned preferentially, so that the traversing overturning efficiency is improved; the maximum value of the error times is 255;
step S73, judging whether CRC (cyclic redundancy check) of all the data frames is completed, if yes, resetting the error times, and proceeding to step S80; if not, the process advances to step S72.
Data flip, i.e. bit-wise (bit) flip, flip 1 to 0 and 0 to 1; in specific practice, only the bit with no fixed value is overturned; the upset rule is for traversing upset to 1bit, 2bit, 3bit … … nbit in proper order, if the check passes yet, then traverse upset to 1bit, 3bit, 5bit … … nbit simultaneously, if the check passes yet, then traverse upset … … to 1bit, 5bit, 9bit … … nbit simultaneously.
The step S90 specifically includes:
setting a current threshold and a time interval, collecting the current value of the power amplifier in real time in the emergency broadcasting process, judging whether the difference value between the current value and the current value at the last moment is larger than the current threshold or not based on the time interval, if so, indicating that the current value is suddenly changed, and closing the power amplifier; if not, continuing to carry out emergency broadcasting. The time interval is less than 50 milliseconds.
The step S20 further includes:
and when the emergency broadcast terminal receives the data frame, the data of the 4 th bit of each data block in the data frame is immediately set to 0.
The 4 data blocks of the data frame are named as block1, block2, block3 and block4, wherein block1 is used for storing PI codes, block2 is used for storing identification codes, block3 and block4 are used for storing information; GB-T15770-1995 describes the types of data blocks divided into type A and type B, identified by the 4 th bit, 0 representing type A, 1 representing type B; the data block of the A type only stores PI codes in block1, the data block of the B type stores PI codes in block1 and block3, so that the data block of the B type possibly causes the information stored in block3 to be modified, and therefore the data of the 4 th bit needs to be set to 0, and the information stored in block3 is prevented from being modified.
In summary, the invention has the advantages that:
1. and when the received data frames are completely received, CRC check is carried out on the data frames, if the CRC check is not passed, error code check is carried out on the data frames by utilizing an RDS broadcast instruction copy, when the data exceeding the preset quantity is not matched, error correction is carried out on the data frames through an instruction format, if the error is still existed, data in the data frames are subjected to traversing and overturning until the check is passed, namely, the data frames of the RDS broadcast instruction are sequentially subjected to quantity check, CRC check, RDS broadcast instruction copy check, instruction format check and bit overturning check until the check is passed, and the correct RDS broadcast instruction is generated, so that the error correction is carried out on the RDS broadcast instruction, and the emergency broadcast effect is greatly improved.
2. Before receiving an RDS broadcast instruction, the RSSI value and the SNR value of a preset frequency point are monitored, namely, the RDS broadcast instruction is received only under the condition that the signal strength reaches the standard, so that the occurrence of noise and error code caused by low signal strength is avoided; by monitoring the current value of the power amplifier in the emergency broadcasting process, when the current value suddenly changes, the power amplifier is immediately turned off, and the power amplifier is prevented from being broken or broken and damaged due to the sudden change of the current, so that the emergency broadcasting effect is further improved.
3. The correct RDS broadcast instruction is stored as the RDS broadcast instruction copy, so that the new received RDS broadcast instruction is quickly corrected by utilizing the RDS broadcast instruction copy, and the emergency broadcast efficiency is greatly improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.

Claims (7)

1. An emergency frequency modulation broadcast instruction receiving method is characterized in that: the method comprises the following steps:
step S10, after the emergency broadcast terminal is started, monitoring an RSSI value and an SNR value of a preset frequency point to generate a monitoring result;
step S20, based on the monitoring result, circularly receiving RDS broadcast instructions by taking 1 data frame as a unit;
step S30, carrying out quantity verification on each received data frame;
step S40, performing CRC on each data frame;
s50, performing error code verification on each data frame based on a prestored RDS broadcast instruction copy;
step S60, error correction and verification are carried out on the data frames based on the instruction format of the RDS broadcast instruction;
step S70, sequentially carrying out error correction and verification on each data frame through data inversion;
step S80, combining the data frames to obtain an RDS broadcast instruction, storing the RDS broadcast instruction as an RDS broadcast instruction copy, and pushing the RDS broadcast instruction to a power amplifier for emergency broadcasting;
step S90, in the emergency broadcasting process, collecting the current value of the power amplifier in real time, and controlling the work of the power amplifier based on the current value;
the step S20 specifically includes:
when the monitoring result shows that the signal strength reaches the standard, circularly receiving an RDS broadcast instruction by taking 1 data frame as a unit;
the RDS broadcasting instruction comprises a plurality of data frames, and the last data frame stores a CRC check value of the RDS broadcasting instruction; 1 said data frame comprising 4 data blocks, 1 said data block comprising 8 bytes; each data block carries the frame number of a data frame and the total frame number;
the step S70 specifically includes:
step S71, taking the frame numbers as the sequence, taking 1bit, 2bit, 4bit or 8bit as the interval, traversing and turning over each data frame in sequence, performing CRC (cyclic redundancy check) on the turned over data frame, recording the turned-over bit each time, accumulating the error times of each bit, and entering step S72 after the CRC passes;
step S72, based on the error times, turning bits corresponding to the data frame of the next frame preferentially, performing CRC (cyclic redundancy check) on the turned data frame, recording the turned bits each time, accumulating the error times of the bits, and entering step S73 after the CRC passes;
step S73, judging whether CRC (cyclic redundancy check) of all the data frames is completed, if yes, resetting the error times, and proceeding to step S80; if not, go to step S72;
the step S90 specifically includes:
setting a current threshold and a time interval, collecting the current value of the power amplifier in real time in the emergency broadcasting process, judging whether the difference value between the current value and the current value at the last moment is larger than the current threshold or not based on the time interval, if so, indicating that the current value is suddenly changed, and closing the power amplifier; if not, continuing to carry out emergency broadcasting.
2. The emergency fm broadcast command receiving method of claim 1, wherein: the step S10 specifically includes:
presetting a frequency point, a first threshold value and a second threshold value, locking the frequency point after the emergency broadcast terminal is started, monitoring the RSSI value and the SNR value of the frequency point, judging whether the RSSI value is larger than the first threshold value and whether the SNR value is larger than the second threshold value, and if so, generating a monitoring result that the signal strength reaches the standard; if not, generating a monitoring result of which the signal strength does not reach the standard.
3. The emergency fm broadcast command receiving method of claim 1, wherein: the step S30 specifically includes:
step S31, judging whether the frame number carried by each data block in each data frame is smaller than or equal to the total frame number, if yes, proceeding to step S32; if not, discarding the corresponding data block;
step S32, judging whether all data frames are received or not based on the total frame number, if yes, entering step S40; if not, the process proceeds to step S20.
4. The emergency fm broadcast command receiving method of claim 1, wherein: the step S40 specifically includes:
after sorting the data frames based on the frame numbers, removing the last data frame to calculate a CRC check value, comparing whether the calculated CRC check value is consistent with the CRC check value carried by the last data frame, if so, indicating that the received data frames are accurate, and entering step S80; if not, it is indicated that each received data frame has an error, and the process proceeds to step S50.
5. The emergency fm broadcast command receiving method of claim 1, wherein: the step S50 specifically includes:
step S51, matching prestored RDS broadcast instruction copies based on the instruction types carried by the data frames, comparing each data block in each data frame with the corresponding data block of the RDS broadcast instruction copy, if 1 byte or 2 bytes are different, indicating that the data block is in error code transmission, replacing the data block with the corresponding data block of the RDS broadcast instruction copy, and entering step S80; otherwise, the data block is indicated to be non-error code transmission, and the step S52 is entered;
step S52, judging whether the transmission times of the data blocks transmitted by the non-error codes exceeds a preset time threshold value, and if the transmission times are the same, entering step S60; if not, the step S20 is carried out, and the corresponding data block is received again.
6. The emergency fm broadcast command receiving method of claim 1, wherein: the step S60 specifically includes:
correcting the error of each data frame based on the instruction format of the RDS broadcast instruction, performing CRC (cyclic redundancy check) on each data frame after error correction, and if the CRC passes, entering step S80; if the CRC check is not passed, the process proceeds to step S70.
7. The emergency fm broadcast command receiving method of claim 1, wherein: the step S20 further includes:
and when the emergency broadcast terminal receives the data frame, the data of the 4 th bit of each data block in the data frame is immediately set to 0.
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