Enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code

Abstract

The embodiment of the invention relates to the technical field of positioning, in particular to an enhanced positioning system combining broadband digital radio frequency storage and forwarding and ship MMSI codes, which comprises a ship radar system and a radar transponder, the ship radar system is composed of an MMSI code coding module, a modulation module, a transmitting module, a receiving module, a clock synchronization module and an MMSI code verification module. The radar transponder is composed of an antenna module, a radio frequency transceiver module and a signal processing module. The ship radar system encodes the MMSI code of the ship into a Morse code, modulates the Morse code into a radio frequency signal, transmits the radio frequency signal to the outside, receives a forwarding signal from a radar transponder, and verifies whether the MMSI code in the received forwarding signal corresponds to the MMSI code of the ship; the radar transponder receives radio frequency signals with MMSI codes from a plurality of ships in real time, and transmits forwarding signals with the MMSI codes when the signals need to be forwarded. The system effectively avoids signal confusion and has good multi-target processing capability.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of positioning technology, and in particular to an enhanced positioning system combining broadband digital radio frequency storage and forwarding with a ship MMSI code. Background Art

[0002] The concept of radar was formed in the early twentieth century. It is used for radio monitoring and ranging. It is an electronic device that uses microwave band electromagnetic waves to detect targets and distances. A radar transponder is a transceiver device. When it receives a shipborne radar signal, the radar transponder can automatically send back an identification signal that can be displayed on the interrogation radar display. This response signal can provide distance, direction and identification information. A radar transponder is a device specifically used for navigation. Its frequency band is allocated to the two marine radar bands, X and S. Currently, most radar transponders operate in the X band.

[0003] However, the inventors of the present application have discovered that the mainstream radar transponders currently on the market have certain deficiencies.

[0004] The first is the signal confusion problem. In mainstream radar transponder systems, when multiple ships transmit signals to the radar transponder at the same time, the lack of effective identification can easily lead to signal confusion, especially at the same frequency, which may lead to inaccurate identification. Although each ship has a unique MMSI code (Maritime Mobile Service Identification Number), which can be used to uniquely identify the ship, mainstream radar transponders cannot effectively utilize the MMSI code.

[0005] The second is the problem of insufficient multi-target processing capabilities. Mainstream radar transponders can usually only process a single or a small number of signals. When faced with a complex environment with multiple ships, their processing and storage capabilities are limited. In radar-intensive scenarios such as ports, the processing capacity will be saturated, resulting in the loss of effective response to surrounding radar interrogation signals. Summary of the invention

[0006] In view of this, an embodiment of the present application proposes an enhanced positioning system that combines broadband digital RF storage and forwarding with the ship's MMSI code, encodes the ship's MMSI code and modulates it into the signal, effectively avoiding signal confusion and ensuring that each signal can be accurately distinguished. By introducing broadband digital RF storage and forwarding technology, it allows simultaneous reception, storage and forwarding of multiple signals with MMSI codes, significantly improving the system's multi-target processing capabilities.

[0007] In the first aspect, the embodiment of the present application proposes an enhanced positioning system combining broadband digital radio frequency storage and forwarding with a ship MMSI code, including: a ship radar system and a radar transponder, the ship radar system is composed of an MMSI code encoding module, a modulation module, a transmitting module, a receiving module, a clock synchronization module and an MMSI code verification module, and the radar transponder is composed of an antenna module, a radio frequency transceiver module and a signal processing module; the MMSI code encoding module is used to encode the ship's own MMSI code into Morse code; the modulation module is used to modulate the encoded Morse code into a radio frequency signal using an ASK modulation method; the transmitting module is used to transmit the modulated radio frequency signal to the outside and record the transmission time; the receiving module is used to receive the forwarding signal from the radar transponder, and the forwarding signal is also a radio frequency signal; A clock synchronization module is used to ensure the time synchronization of the transmitting module and the receiving module; an MMSI code verification module is used to verify whether the MMSI code in the forwarding signal received from the radar transponder corresponds to the MMSI code of the ship itself; an antenna module is used to receive radio frequency signals with MMSI codes from multiple ships in real time, and transmit forwarding signals with MMSI codes when forwarding signals are required; a radio frequency transceiver module is used to convert the received radio frequency signal into an intermediate frequency signal, and convert the intermediate frequency signal into a forwarding signal when forwarding signals are required; a signal processing module is used to convert the intermediate frequency signal into a digital signal through an analog-to-digital converter in a broadband digital radio frequency memory, and then write it into a high-speed memory. When forwarding signals are required, the digital signal is read out under the control of the controller and converted into an intermediate frequency signal by the digital-to-analog converter.

[0008] In some optional embodiments, the ship's own MMSI code is a 9-digit code, and encoding the ship's own MMSI code into Morse code includes: dividing the ship's own MMSI code into n groups in sequence, with k bits in each group; converting each group of numbers into m-bit binary numbers; representing 0 in the m-bit binary number with a dot in the Morse code, and representing 1 in the m-bit binary number with a dash in the Morse code, thereby encoding the ship's own MMSI code into Morse code.

[0009] In some optional embodiments, the ASK modulation method is used to modulate the encoded Morse code into a radio frequency signal, including: representing the dots in the encoded Morse code with low amplitude, and representing the dashes in the encoded Morse code with high amplitude to obtain a radio frequency signal.

[0010] In some optional embodiments, the RF transceiver module consists of a ring, an RF receiving link and an RF transmitting link; the RF signals with MMSI codes from multiple ships received in real time by the antenna module enter the RF receiving link through the circulator, are converted into intermediate frequency signals by the RF receiving link, and are transmitted to the signal processing module; the intermediate frequency signals output by the signal processing module enter the RF transmitting link, are converted into forwarding signals with MMSI codes by the RF transmitting link, and are input into the antenna module through the circulator.

[0011] In some optional embodiments, the signal processing module is composed of a broadband digital RF memory and a controller, and the broadband digital RF memory is composed of a DRFM local oscillator, two filters, an analog-to-digital converter, a high-speed memory and a digital-to-analog converter; the intermediate frequency signal output by the RF transceiver module is converted into a digital signal by the analog-to-digital converter after being processed by the DRFM local oscillator and the filter, and written into the high-speed memory; the controller immediately controls the forwarding of the digital signal, reads the digital signal from the high-speed memory, converts it into an intermediate frequency signal by the digital-to-analog converter, and outputs it to the RF transceiver module after being processed by the DRFM local oscillator and the filter.

[0012] In some optional embodiments, after verifying whether the MMSI code in the received forwarded signal from the radar transponder corresponds to the MMSI code of the ship itself, it also includes: if it is verified that the MMSI code in the received forwarded signal from the radar transponder is inconsistent with the MMSI code of the ship itself, then the received forwarded signal from the radar transponder is not responded to; if it is verified that the MMSI code in the received forwarded signal from the radar transponder is consistent with the MMSI code of the ship itself, then the distance is calculated according to the time difference between the transmitted radio frequency signal and the received forwarded signal from the radar transponder.

[0013] In some optional embodiments, the radar transponder is further provided with a power control module for controlling the power supply of the radio frequency transceiver module and the signal processing module.

[0014] This embodiment proposes an enhanced positioning system that combines broadband digital radio frequency storage and forwarding with the ship's MMSI code. The MMSI code encoding module of the ship radar system can encode the ship's own MMSI code into Morse code, encode the ship's MMSI code and modulate it into the radio frequency signal to ensure that each ship's signal has a unique identity, which can enable the ship to effectively distinguish its own signal forwarded by the radar transponder from the signals of other ships. Even at the same frequency, the signal of other ships will not be regarded as its own signal, thereby effectively avoiding the problem of positioning errors caused by signal confusion. The radar transponder introduces broadband digital radio frequency storage and forwarding technology, which enables the radar transponder to simultaneously receive, store and process multiple signals with MMSI codes, significantly improving the system's multi-target processing capabilities and meeting the multi-target monitoring requirements in busy port environments. The introduction of MMSI code encoding and DRFM technology has greatly improved the positioning capability of the positioning system, making the ship's own positioning more accurate, effectively ensuring the navigation safety of the ship, and is of great significance for marine operation management, fishing vessel monitoring and resource protection.

[0015] On the second aspect, an embodiment of the present application proposes an enhanced positioning method that combines broadband digital RF storage and forwarding with a ship's MMSI code, which is applied to a ship radar system. The method includes the following steps: encoding the ship's own MMSI code into a Morse code; using an ASK modulation method to modulate the encoded Morse code into a radio frequency signal; transmitting the modulated radio frequency signal to the outside and recording the transmission time; receiving a forwarding signal transmitted from a radar transponder, and verifying whether the MMSI code received in the forwarding signal from the radar transponder corresponds to the ship's own MMSI code, and the forwarding signal is also a radio frequency signal.

[0016] In the third aspect, an enhanced positioning method combining broadband digital RF storage and forwarding with ship MMSI code is applied to radar transponders, and the method includes the following steps: receiving RF signals with MMSI codes from multiple ships in real time; wherein the RF signals with MMSI codes from multiple ships are emitted by ship radar systems of multiple ships; converting the received RF signals into intermediate frequency signals; converting the intermediate frequency signals into digital signals through an analog-to-digital converter and writing them into a high-speed memory; when the signal needs to be forwarded, reading out the digital signal and converting it into an intermediate frequency signal through a digital-to-analog converter; converting the intermediate frequency signal into a forwarding signal with MMSI code and transmitting it to the outside, and the forwarding signal is also a RF signal.

[0017] In a fourth aspect, an embodiment of the present application proposes a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement an enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code applied to a ship radar system as described in the second aspect above, or it can implement an enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code applied to a radar transponder as described in the third aspect above.

[0018] It can be understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related technologies, the drawings required for use in the embodiments of the present application or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of an enhanced positioning system combining broadband digital radio frequency storage and forwarding and a ship MMSI code provided in an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the principle of encoding the MMSI code of a ship itself into a ten-bit binary Morse code provided in one embodiment of the present application;

[0022] Figure 3 is a schematic structural diagram of a radar transponder provided in one embodiment of the present application;

[0023] Figure 4 It is a flowchart of an enhanced positioning method combining broadband digital radio frequency storage and forwarding and ship MMSI code applied to a ship radar system, provided in another embodiment of the present application;

[0024] Figure 5 It is a flowchart of an enhanced positioning method combining broadband digital radio frequency storage and forwarding and ship MMSI code applied to a radar transponder provided in another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the various embodiments of the present application, many technical details are proposed in order to make the reader better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is only for the convenience of description, and the specific implementation mode of the present application should not constitute any limitation. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0026] An embodiment of the present application proposes an enhanced positioning system that combines broadband digital radio frequency storage and forwarding with a ship's MMSI code. The implementation details of the enhanced positioning system that combines broadband digital radio frequency storage and forwarding with a ship's MMSI code proposed in this embodiment are specifically described below. The following content is only the implementation details provided for ease of understanding and is not necessary for the implementation of this solution.

[0027] The specific structure of the enhanced positioning system combining broadband digital radio frequency storage and forwarding with the ship MMSI code proposed in this embodiment can be as follows: Figure 1 As shown, it includes: a ship radar system 10 and a radar transponder 20. The ship radar system 10 is specifically composed of an MMSI code encoding module 11, a modulation module 12, a transmitting module 13, a receiving module 14, a clock synchronization module 16 and an MMSI code verification module 15. The radar transponder 20 is specifically composed of an antenna module 21, a radio frequency transceiver module 22 and a signal processing module 23.

[0028] The functions and technical details of each module on the ship radar system 10 are first introduced below.

[0029] The MMSI code encoding module 11 is used to encode the ship's own MMSI code into Morse code. The modulation module 12 is used to modulate the encoded Morse code into a radio frequency signal using an ASK modulation method. The transmitting module 13 is used to transmit the modulated radio frequency signal to the outside and record the transmission time. The receiving module 14 is used to receive the forwarding signal from the radar transponder, which is also a radio frequency signal. The MMSI code verification module 15 is used to verify whether the MMSI code received in the forwarding signal from the radar transponder corresponds to the ship's own MMSI code. The clock synchronization module 16 is used to ensure the time synchronization of the transmitting module and the receiving module.

[0030] That is to say, when the ship radar system needs to transmit a signal, it first encodes the ship's own MMSI code into Morse code through the MMSI code encoding module, then uses ASK modulation to modulate the encoded Morse code into a radio frequency signal, and finally transmits the modulated radio frequency signal to the outside. When receiving a signal, it is necessary to extract the MMSI code from the received forwarding signal, and then verify whether the MMSI code in the forwarding signal received from the radar transponder corresponds to the ship's own MMSI code. If it is verified that the MMSI code in the forwarding signal received from the radar transponder is inconsistent with the ship's own MMSI code, it means that it is a signal from another ship and there is no need to respond to the forwarding signal. If it is verified that the MMSI code in the forwarding signal received from the radar transponder is consistent with the ship's own MMSI code, it means that the forwarding signal is the radar transponder's response to the radio frequency signal emitted by the ship itself, and the distance calculation needs to be performed based on the time difference between the emitted radio frequency signal and the received forwarding signal from the radar transponder.

[0031] In one example, the ship's own MMSI code is a 9-digit code. When the MMSI code encoding module encodes the ship's own MMSI code into Morse code, it first needs to divide the ship's own MMSI code into n groups in sequence, with k bits in each group, and then convert each group of numbers into m-bit binary numbers. Finally, the 0 in the m-bit binary number is represented by a dot in the Morse code, and the 1 in the m-bit binary number is represented by a dash in the Morse code, thereby encoding the ship's own MMSI code into Morse code.

[0032] Morse code encodes each number as a combination of five dots and dashes, for example, the Morse code for the number 0 is "-----", and the Morse code for the number 1 is ".----". The ship's MMSI code consists of 9 digits. If these nine digits are encoded as Morse code, excluding the spaces between the digits, at least 45 dots and dashes are required.

[0033] The encoding method of this embodiment, for example, divides the 9-digit MMSI code of the ship into 3 groups in order, with 3 digits in each group. If the MMSI code of the ship itself is "123456789", then the first group is "123", the second group is "456", and the third group is "789". Convert each group of numbers into a 10-bit binary number, the first group is "0001111011", the second group is "0111001000", and the third group is "1100010101". Represent the 0 in the 10-bit binary number with a dot in Morse code and 1 with a dash in Morse code, then the first group will be represented as "…----.--", and the second and third groups are represented in the same way. The final encoded 10-bit binary Morse code is "…----.--.---..-…--…-.-.-". The encoding principle of the 10-bit binary Morse code can be as follows Figure 2 As shown, the number of bits of the ten-bit binary Morse code encoded by this encoding method is 30, which is 33% less than that of direct encoding. Moreover, since n is 3, the largest three-digit number is 999, and the maximum number that can be represented by ten-bit binary is 1024, so ten-bit binary can represent all three-digit numbers.

[0034] It is worth noting that there are many combinations of values ​​for n, k, and m. For example, n is 1, k is 9, and m is 4, which can also implement Morse code encoding.

[0035] In one example, ASK modulation is a modulation method for transmitting digital information by changing the amplitude of a carrier wave. In ASK, the frequency and phase of the carrier wave remain unchanged, while the amplitude changes according to the change of the digital baseband signal. When the modulation module uses the ASK modulation method to modulate the encoded Morse code into a radio frequency signal, the dots in the encoded Morse code are represented by a low amplitude, and the dashes in the encoded Morse code are represented by a high amplitude to obtain a radio frequency signal. Among them, the amplitude value of the high amplitude is higher than the amplitude value of the low amplitude.

[0036] Next, the functions and technical details of each module on the radar transponder 20 side are introduced.

[0037] The antenna module 21 is used to receive radio frequency signals with MMSI codes from multiple ships in real time, and transmit forwarding signals with MMSI codes when forwarding signals are required. The radio frequency transceiver module 22 is used to convert the received radio frequency signals into intermediate frequency signals, and convert the intermediate frequency signals into forwarding signals when forwarding signals are required. The signal processing module 23 is used to convert the intermediate frequency signals into digital signals through the analog-to-digital converter in the broadband digital radio frequency memory, and then write them into the high-speed memory. When forwarding signals are required, the digital signals are read out under the control of the controller and converted into intermediate frequency signals by the digital-to-analog converter.

[0038] That is to say, the radar transponder needs to receive RF signals with MMSI codes from multiple ships in real time, convert the received RF signals into intermediate frequency signals, and then convert the intermediate frequency signals into digital signals through the analog-to-digital converter in the broadband digital RF memory, and then write them into the high-speed memory. When it is necessary to forward the signal, the digital signal is first read out from the high-speed memory under the control of the controller and converted into an intermediate frequency signal by the digital-to-analog converter, and then the intermediate frequency signal is converted into a forwarding signal with the MMSI code and transmitted.

[0039] In an example, Figure 1 As shown, the radar transponder 20 is also provided with a power control module 24, which is used to control the power supply of the RF transceiver module 22 and the signal processing module 23.

[0040] In one example, the specific composition of the RF transceiver module can be as follows: Figure 3 As shown in the figure, the RF transceiver module consists of a ring, an RF receiving link and an RF transmitting link. The RF signals with MMSI codes received by the antenna module in real time from multiple ships enter the RF receiving link through the circulator, are converted into intermediate frequency signals by the RF receiving link, and are transmitted to the signal processing module. The intermediate frequency signal output by the signal processing module enters the RF transmitting link, is converted into a forwarding signal with MMSI code by the RF transmitting link, and is input into the antenna module through the circulator.

[0041] In one example, the signal processing module is specifically composed of: Figure 3 As shown, the signal processing module consists of a broadband digital RF memory and a controller. The broadband digital RF memory consists of a DRFM local oscillator, two filters (one for each transmission and reception), an analog-to-digital converter, a high-speed memory, and a digital-to-analog converter. The intermediate frequency signal output by the RF transceiver module is processed by the DRFM local oscillator and the filter, converted into a digital signal by the analog-to-digital converter, and written into the high-speed memory. The controller immediately controls the forwarding of the digital signal, reads the digital signal from the high-speed memory, converts it into an intermediate frequency signal by the digital-to-analog converter, and outputs it to the RF transceiver module after being processed by the DRFM local oscillator and the filter.

[0042] In this embodiment, the MMSI code encoding module of the ship radar system can encode the ship's own MMSI code into Morse code, encode the ship's MMSI code and modulate it into the radio frequency signal, ensuring that each ship's signal has a unique identity, which can enable the ship to effectively distinguish its own signal forwarded by the radar transponder from the signals of other ships, and even at the same frequency, it will not regard the signals of other ships as its own signals, thereby effectively avoiding the problem of positioning errors caused by signal confusion. The radar transponder introduces broadband digital radio frequency storage and forwarding technology, which enables it to simultaneously receive, store and process multiple signals with MMSI codes, significantly improving the system's multi-target processing capabilities, and can meet the multi-target monitoring needs in busy port environments. The introduction of MMSI code encoding and DRFM technology has greatly improved the positioning efficiency and accuracy of the positioning system, making the ship's own positioning more accurate, effectively ensuring the navigation safety of the ship, and is of great significance for marine operation management, fishing vessel monitoring and resource protection.

[0043] The enhanced positioning system combining broadband digital radio frequency storage and forwarding with the ship MMSI code proposed in this embodiment has broad application prospects, and is described below using three scenarios as examples.

[0044] The first is the offshore ship positioning scenario.

[0045] In open waters, ship positioning is the most critical link in maritime safety and navigation. Traditional radar systems often face problems such as inability to respond in time and signal confusion when facing multiple targets and co-frequency interference. Through the MMSI code modulation and DRFM technology of this application, the ship radar system can accurately identify the signal of its own ship and obtain the ship's location information in real time. This can provide more accurate ship positioning services in busy sea areas or in bad weather conditions to ensure navigation safety.

[0046] The second is the port management and scheduling scenario.

[0047] Ports are hubs for maritime transportation, and ships need to be accurately located and identified when entering and leaving ports. In busy ports, multiple ships may enter and exit at the same time, and traditional radar systems may be inefficient when dealing with multiple target ships, or even cause identification confusion. This application embeds the MMSI code of each ship into the radio frequency signal to ensure high-precision and rapid target identification in a multi-ship environment, further improving the efficiency and safety of port scheduling.

[0048] Finally, there is the multi-target tracking and monitoring scenario.

[0049] In the fields of marine operations, fisheries and marine resource development, it is often necessary to track multiple target ships at the same time. The ship signal with MMSI code combined in this application can help to track and monitor multiple target ships in real time, which is of great significance for marine operation management, fishing vessel monitoring and resource protection.

[0050] It is worth mentioning that all modules involved in this embodiment are logic modules. In practical applications, a logic unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by this application, but this does not mean that there are no other units in this embodiment.

[0051] Another embodiment of the present application proposes an enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code, which is applied to a ship radar system. The following is a specific description of the implementation details of the enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code proposed in this embodiment. The following content is only the implementation details provided for ease of understanding and is not necessary for the implementation of this example.

[0052] The specific process of the enhanced positioning method combining broadband digital radio frequency storage and forwarding with the ship MMSI code proposed in this embodiment can be as follows: Figure 4 As shown, including:

[0053] Step 31, encode the ship's own MMSI code into Morse code.

[0054] Step 32: Use ASK modulation to modulate the encoded Morse code into a radio frequency signal.

[0055] Step 33, transmitting the modulated radio frequency signal to the outside, and recording the transmission time.

[0056] Step 34, receiving a forwarding signal transmitted from the radar transponder, and verifying whether the MMSI code in the forwarding signal received from the radar transponder corresponds to the MMSI code of the ship itself, the forwarding signal is also a radio frequency signal.

[0057] The step division of the above methods is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this application; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this application.

[0058] Another embodiment of the present application proposes an enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code, which is applied to a radar transponder. The implementation details of the enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code proposed in this embodiment are specifically described below. The following content is only the implementation details provided for ease of understanding and is not necessary for the implementation of this example.

[0059] The specific process of the enhanced positioning method combining broadband digital radio frequency storage and forwarding with the ship MMSI code proposed in this embodiment can be as follows: Figure 5 As shown, including:

[0060] Step 41, receiving radio frequency signals with MMSI codes from multiple ships in real time, wherein the radio frequency signals with MMSI codes from multiple ships are emitted by ship radar systems of multiple ships.

[0061] Step 42: convert the received radio frequency signal into an intermediate frequency signal.

[0062] Step 43, converting the intermediate frequency signal into a digital signal through an analog-to-digital converter and writing the digital signal into a high-speed memory.

[0063] Step 44, when the signal needs to be forwarded, the digital signal is read out and converted into an intermediate frequency signal through a digital-to-analog converter.

[0064] Step 45, converting the intermediate frequency signal into a forwarding signal with an MMSI code and transmitting it to the outside, where the forwarding signal is also a radio frequency signal.

[0065] The step division of the above methods is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this application; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this application.

[0066] Another embodiment of the present application proposes a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement the enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code applied to a ship radar system as described in the above embodiments, or it can implement the enhanced positioning method combining broadband digital radio frequency storage and forwarding with a ship MMSI code applied to a radar transponder as described in the above embodiments.

[0067] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM (Read-Only Memory), RAM (Random Access Memory), disk or optical disk and other media that can store program codes.

[0068] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. An enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code, characterized in that: The enhanced positioning system comprises: a ship radar system and a radar transponder, wherein the ship radar system is composed of an MMSI code encoding module, a modulation module, a transmitting module, a receiving module, a clock synchronization module and an MMSI code verification module, and the radar transponder is composed of an antenna module, a radio frequency transceiver module and a signal processing module; MMSI code encoding module, used to encode the ship's own MMSI code into Morse code; A modulation module is used to modulate the encoded Morse code into a radio frequency signal using an ASK modulation method; The transmitting module is used to transmit the modulated radio frequency signal to the outside and record the transmitting time; A receiving module, used for receiving a forwarding signal from a radar transponder, where the forwarding signal is also a radio frequency signal; Clock synchronization module, used to ensure time synchronization between the transmitting module and the receiving module; MMSI code verification module, used to verify whether the MMSI code received in the forwarded signal from the radar transponder corresponds to the ship's own MMSI code; An antenna module, used for receiving radio frequency signals with MMSI codes from multiple ships in real time, and transmitting a forwarding signal with MMSI codes when the signal needs to be forwarded; The RF transceiver module is used to convert the received RF signal into an intermediate frequency signal, and convert the intermediate frequency signal into a forwarding signal when the signal needs to be forwarded; The signal processing module is used to convert the intermediate frequency signal into a digital signal through the analog-to-digital converter in the broadband digital RF memory, and then write it into the high-speed memory. When the signal needs to be forwarded, the digital signal is read out under the control of the controller and converted into an intermediate frequency signal by the digital-to-analog converter.

2. The enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code according to claim 1, characterized in that: The ship's own MMSI code is a 9-digit code. The ship's own MMSI code is encoded into Morse code, including: Divide the ship's own MMSI code into n groups in order, with each k bits forming a group; Convert each set of numbers into m-bit binary numbers; The 0 in the m-bit binary number is represented by a dot in the Morse code, and the 1 in the m-bit binary number is represented by a dash in the Morse code, thereby encoding the ship's own MMSI code into the Morse code.

3. The enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code according to claim 2, characterized in that: The ASK modulation method is used to modulate the encoded Morse code into a radio frequency signal, including: The dots in the encoded Morse code are represented by low amplitude, and the dashes in the encoded Morse code are represented by high amplitude, thereby obtaining a radio frequency signal.

4. The enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code according to claim 1, characterized in that: The RF transceiver module consists of a ring, RF receiving link and RF transmitting link; The RF signals with MMSI codes received by the antenna module in real time from multiple ships enter the RF receiving link through the circulator, are converted into intermediate frequency signals by the RF receiving link, and then transmitted to the signal processing module; The intermediate frequency signal output by the signal processing module enters the RF transmission link, is converted by the RF transmission link into a forwarding signal with an MMSI code, and is input to the antenna module through the circulator.

5. The enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code according to claim 4, characterized in that: The signal processing module is composed of a broadband digital radio frequency memory and a controller. The broadband digital radio frequency memory is composed of a DRFM local oscillator, two filters, an analog-to-digital converter, a high-speed memory and a digital-to-analog converter. The intermediate frequency signal output by the RF transceiver module is processed by the DRFM local oscillator and filter, converted into a digital signal by the analog-to-digital converter, and written into the high-speed memory; The controller immediately controls the forwarding of the digital signal, reads the digital signal from the high-speed memory, converts it into an intermediate frequency signal by the digital-to-analog converter, and outputs it to the RF transceiver module after being processed by the DRFM local oscillator and filter.

6. The enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code according to claim 1, characterized in that: After verifying whether the MMSI code in the received transponder signal from the radar transponder corresponds to the ship's own MMSI code, it also includes: If it is verified that the MMSI code in the received forwarded signal from the radar transponder is inconsistent with the MMSI code of the ship itself, then the forwarded signal received from the radar transponder is not responded to; If it is verified that the MMSI code in the received forwarded signal from the radar transponder is consistent with the ship's own MMSI code, the distance calculation is performed based on the time difference between the transmitted RF signal and the received forwarded signal from the radar transponder.

7. An enhanced positioning system combining broadband digital radio frequency storage and forwarding with ship MMSI code according to any one of claims 1 to 6, characterized in that: The radar transponder is also provided with a power control module for controlling the power supply of the radio frequency transceiver module and the signal processing module.

8. An enhanced positioning method combining broadband digital radio frequency storage and forwarding with ship MMSI code, characterized in that: Applied to a ship radar system, the method comprises: Encode the ship's own MMSI code into Morse code; The ASK modulation method is used to modulate the encoded Morse code into a radio frequency signal; Transmit the modulated radio frequency signal to the outside and record the transmission time; Receive the transponder signal transmitted by the radar transponder and verify whether the MMSI code in the transponder signal received from the radar transponder corresponds to the ship's own MMSI code. The transponder signal is also a radio frequency signal.

9. An enhanced positioning method combining broadband digital radio frequency storage and forwarding with ship MMSI code, characterized in that: Applied to a radar transponder, the method comprises: receiving radio frequency signals with MMSI codes from multiple ships in real time; wherein the radio frequency signals with MMSI codes from multiple ships are emitted by ship radar systems of multiple ships; Convert the received radio frequency signal into an intermediate frequency signal; The intermediate frequency signal is converted into a digital signal through an analog-to-digital converter and written into a high-speed memory; When the signal needs to be forwarded, the digital signal is read out and converted into an intermediate frequency signal through a digital-to-analog converter; The intermediate frequency signal is converted into a forwarding signal with an MMSI code and transmitted to the outside. The forwarding signal is also a radio frequency signal.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, it can implement the enhanced positioning method combining broadband digital radio frequency storage and forwarding with the ship MMSI code applied to the ship radar system as described in claim 8, or it can implement the enhanced positioning method combining broadband digital radio frequency storage and forwarding with the ship MMSI code applied to the radar transponder as described in claim 9.

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