A time-frequency coordinated multi-mode signal fiber fusion transmission system and method

Abstract

This invention discloses a time-frequency coordinated multi-standard signal fiber optic fusion transmission system and method, relating to the field of signal transmission technology for radio astronomy terminals. It includes: a time-frequency distribution module, a power supply and heat dissipation module, and a high-performance electromagnetic shielding module. The time-frequency distribution module aggregates external reference clock, second pulse, synchronization trigger, and gigabit network signals into fiber optic network signal output. The power supply and heat dissipation module provides power to the system and ensures heat dissipation. The high-performance electromagnetic shielding module suppresses electromagnetic leakage and external electromagnetic interference, meeting the system's electromagnetic compatibility and shielding requirements. This invention aggregates external reference clock, second pulse, synchronization trigger, and gigabit network signals into a single signal transmission, significantly simplifying the transmission link and greatly improving the cabling efficiency and maintenance convenience of complex astronomical terminal systems.

Description

Technical Field

[0001] This invention relates to the field of radio astronomy terminal signal transmission technology, and more specifically to a time-frequency coordinated multi-standard signal fiber optic fusion transmission system and method. Background Technology

[0002] As radio astronomy research continues to deepen, the demands on the observation accuracy and capabilities of radio telescopes are constantly increasing. To achieve greater field-of-view coverage, multi-beam and phased array receivers have become important future development directions.

[0003] These advanced receiver technologies place higher demands on the signal acquisition and transmission performance of digital terminals. To efficiently acquire output signals from multi-beam and phased array receivers, the system needs to be equipped with large-scale digital processing units; to improve signal fidelity, digital acquisition units are typically deployed near the receiver to directly digitize the radio frequency signals. These application modes impose stringent requirements on the synchronization performance, electromagnetic shielding characteristics, operational stability, and long-term reliability of digital equipment.

[0004] Therefore, proposing a time-frequency coordinated multi-standard signal fiber optic fusion transmission system and method to solve the difficulties existing in the prior art is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a time-frequency coordinated multi-standard signal fiber optic fusion transmission system and method, which aims to solve the problems of complex transmission links, low time-frequency synchronization accuracy and severe electromagnetic interference in the signal transmission of existing radio astronomy terminals, and realize multi-channel signal aggregation transmission, high-precision time-frequency distribution and high-performance electromagnetic shielding.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A time-frequency coordinated multi-standard signal fiber optic fusion transmission system includes: a time-frequency distribution module, a power supply and heat dissipation module, and a high-performance electromagnetic shielding module; wherein, The time-frequency distribution module is used to aggregate external reference clock, second pulse, synchronization trigger and gigabit network signals and convert them into fiber optic network signals for output; The power supply and heat dissipation module is used to supply power to the system and provide heat dissipation protection; High-performance electromagnetic shielding modules are used to suppress electromagnetic leakage and external electromagnetic interference, meeting the system's electromagnetic compatibility and shielding requirements.

[0007] Optionally, the time-frequency distribution module includes a time-frequency distribution board, an SMA connector, and a QSFP+ connector; The SMA connector serves as the input interface for external reference clock, second pulse, synchronous trigger, and gigabit network signals. The QSFP+ connector serves as the output interface for fiber optic network signals, supporting up to 20 simultaneous outputs.

[0008] Optionally, the time and frequency allocation board includes a clock phase-locked loop frequency multiplier module, an FPGA main control module, a Ref_clk allocation module, a Trig allocation module, a 1GbE allocation module, a 1PPS allocation module, and a fiber aggregation output module; The output of the clock phase-locked loop frequency multiplier module is connected to the input of the Ref_clk allocation module and the clock input of the FPGA main control module, respectively. The signal terminals of the FPGA main control module are connected to the input terminals of the Trig distribution module, the 1GbE distribution module, and the 1PPS distribution module, respectively. The outputs of the Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module are all connected to the input of the fiber aggregation output module.

[0009] Optionally, the FPGA main control module is equipped with a noise source control signal output terminal, and the noise source control signal is output with the rising edge of the 1PPS signal as the trigger start point.

[0010] Optionally, the Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module all support up to 20 channels of synchronous signal output.

[0011] Optionally, the power supply and heat dissipation module includes a power supply module, a power connector, a centrifugal fan, and heat sink fins; The power module is connected to an external power source via a power connector, and the centrifugal fan and heat sink fins are arranged on a corresponding time-frequency distribution board.

[0012] Optionally, the high-performance electromagnetic shielding module includes a high-performance electromagnetic shielding cavity, a feedthrough capacitor, and a filter; The feedthrough capacitor and filter are installed on the wall of the high-performance electromagnetic shielding cavity, and the internal terminals of the feedthrough capacitor and filter are connected to the time-frequency distribution module, while the external terminals are used to receive external signals.

[0013] A time-frequency coordinated multi-standard signal fiber optic fusion transmission method, executing the time-frequency coordinated multi-standard signal fiber optic fusion transmission system described above, includes the following steps: S1, external reference clock, second pulse, synchronous trigger and gigabit network signal are input to the time and frequency distribution board via SMA connector; S2, the clock phase-locked loop and frequency multiplier module performs phase-locked loop and frequency multiplication processing on the external reference clock, and outputs the clock signal to the Ref_clk allocation module and the FPGA main control module; S3, the FPGA main control module performs logic processing on the input signals, outputs a synchronous trigger signal to the Trig distribution module, outputs a network signal to the 1GbE distribution module, outputs a second pulse signal to the 1PPS distribution module, and outputs a synchronous noise source control signal; The S4, Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module perform multi-channel synchronous distribution of the corresponding signals respectively; S5, the fiber aggregation output module aggregates the distributed reference clock, synchronous trigger, gigabit network, and second pulse signals into fiber optic signals, which are then output via a QSFP+ connector; S6, the power supply and heat dissipation module supplies power to and dissipates heat from the time-frequency distribution board, and the high-performance electromagnetic shielding module performs electromagnetic shielding on the internal components.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a time-frequency coordinated multi-standard signal fiber optic fusion transmission system and method, the beneficial effects of which are: 1) By aggregating external reference clock, second pulse, synchronization trigger and gigabit network signal into a single signal transmission, the transmission link is greatly simplified and the cabling efficiency and maintenance convenience of complex astronomical terminal systems are significantly improved. 2) Converting input electrical signals into optical signals for transmission and reducing the number of external interfaces through multi-signal aggregation significantly reduces electromagnetic radiation levels and makes it easier to achieve high-performance electromagnetic shielding; 3) Supports the synchronous distribution of up to 20 high-precision time and frequency signals, which can ensure high-precision time and frequency synchronization between multiple signal acquisition units and provide reliable support for high-fidelity observation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 An overall structural diagram of a time-frequency coordinated multi-standard signal fiber optic fusion transmission system provided by the present invention; Figure 2 This is a structural diagram of the time-frequency allocation board provided by the present invention; Among them, 1-time and frequency distribution board, 2-SMA connector, 3-QSFP+ connector, 4-power module, 5-power connector, 6-centrifugal fan, 7-through capacitor, 8-filter, 9-shielding top cover, 10-clip cover, 11-handle, 12-middle cover, 13-shielding cavity body, 14-shielding bottom cover. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figure 1 As shown, this invention discloses a time-frequency coordinated multi-standard signal fiber optic fusion transmission system, comprising: a time-frequency allocation module, a power supply and heat dissipation module, and a high-performance electromagnetic shielding module; wherein, The time-frequency distribution module is used to aggregate external reference clock, second pulse, synchronization trigger and gigabit network signals and convert them into fiber optic network signals for output; The power supply and heat dissipation module is used to supply power to the system and provide heat dissipation protection; High-performance electromagnetic shielding modules are used to suppress electromagnetic leakage and external electromagnetic interference, meeting the system's electromagnetic compatibility and shielding requirements.

[0019] Furthermore, the time-frequency allocation module includes a time-frequency allocation board 1, an SMA connector 2, and a QSFP+ connector 3; SMA connector 2 serves as the input interface for external reference clock, second pulse, synchronous trigger, and gigabit network signals; The QSFP+ connector 3 serves as the output interface for fiber optic network signals, supporting up to 20 simultaneous outputs.

[0020] Specifically, the time-frequency distribution module includes a time-frequency distribution board, four SMA connectors, and twenty QSFP+ connectors. Its core function is to aggregate four types of signals from the cable input: external reference clock, second pulse, synchronization trigger, and gigabit network signal, and convert them into fiber optic network signal output. The time-frequency distribution module has high-precision time-frequency signal distribution capabilities, supports single-channel signal input, and up to 20 channels of synchronous signal output. It has a built-in phase-locked loop (PLL) frequency multiplier module, which can accurately perform phase-locked processing on the input external reference clock and multiply it to a preset specified frequency. It also provides a noise source control interface, specifically for controlling and driving the receiver's noise source, ensuring the synchronization and stability of the noise source operation.

[0021] Further, see Figure 2 As shown, the time-frequency allocation board includes a clock phase-locked loop frequency multiplier module, an FPGA main control module, a Ref_clk allocation module, a Trig allocation module, a 1GbE allocation module, a 1PPS allocation module, and a fiber aggregation output module; The output of the clock phase-locked loop frequency multiplier module is connected to the input of the Ref_clk allocation module and the clock input of the FPGA main control module, respectively. Specifically, the clock phase-locked loop (PLL) multiplier module is responsible for phase-locking the input external reference clock (Ref_clk) and multiplying it to a preset specified frequency. The PLL multiplier module outputs two clock signals: one is sent to the Ref_clk allocation module, and the other is sent to the FPGA as its operating clock. Internally, the PLL multiplier module integrates a high-performance clock manager with low jitter and low phase noise, enabling it to stably output high-precision, high-reliability clock signals, providing a fundamental guarantee for the normal operation of the entire board.

[0022] The signal terminals of the FPGA main control module are connected to the input terminals of the Trig distribution module, the 1GbE distribution module, and the 1PPS distribution module, respectively. Specifically, the FPGA main control module, as the core of the board, possesses strong logic processing capabilities and primarily undertakes tasks such as receiving and parsing external commands and generating synchronous trigger signals. The FPGA main control module receives GPS_T signals, 1GbE signals, and 1PPS signals input from the 1PPS distribution module. After logic processing, it outputs a Trig signal to the Trig distribution module. The Trig signal is used to achieve external synchronous triggering during signal acquisition and processing. Simultaneously, the FPGA main control module outputs a 1GbE signal to the 1GbE distribution module for network data exchange. Furthermore, the FPGA main control module can generate a noise source control signal T_cal according to the parameter settings of the host computer, using the rising edge of the 1PPS signal as the trigger point to achieve strict synchronous output and ensure the accuracy of noise source control.

[0023] The outputs of the Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module are all connected to the input of the fiber aggregation output module.

[0024] Specifically, the fiber aggregation output module is responsible for aggregating four types of signals: Ref_clk, Trig, 1GbE, and 1PPS, and converting them into fiber optic network signals for output. It can support up to 20 simultaneous fiber optic signals, and the output port uses a QSFP+ fiber optic interface. The input ports for the above four types of signals all use SMA cable interfaces to ensure the stability and compatibility of signal input.

[0025] Furthermore, the FPGA main control module is equipped with a noise source control signal output terminal, and the noise source control signal is output with the rising edge of the 1PPS signal as the trigger point.

[0026] Specifically, each distribution module supports multiple signal outputs. The Ref_clk distribution module, Trig distribution module, 1GbE distribution module, and 1PPS distribution module can each achieve synchronous distribution of up to 20 corresponding signals, meeting the needs of multi-unit signal acquisition and transmission.

[0027] Furthermore, the Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module all support up to 20 channels of signal synchronous output.

[0028] Furthermore, the power supply and heat dissipation module includes a power supply module 4, a power connector 5, a centrifugal fan 6, and heat dissipation fins. The power module 4 is connected to an external power source through the power connector 5, and the centrifugal fan 6 is arranged on the time-frequency distribution board 1 corresponding to the heat sink fins.

[0029] Specifically, the power supply and heat dissipation module adopts an optimized heat dissipation architecture design. Through the synergistic effect of the centrifugal fan 6 and the heat dissipation fins, the heat generated during the operation of the equipment is efficiently dissipated, effectively avoiding equipment failure caused by overheating and ensuring the long-term continuous, stable and reliable operation of the entire system.

[0030] Furthermore, the high-performance electromagnetic shielding module includes a high-performance electromagnetic shielding cavity, a through-core capacitor 7, and a filter 8; The feedthrough capacitor 7 and filter 8 are installed on the wall of the high-performance electromagnetic shielding cavity, and the internal terminals of the feedthrough capacitor 7 and filter 8 are connected to the time-frequency distribution module, while the external terminals are used to receive external signals.

[0031] Specifically, the high-performance electromagnetic shielding cavity consists of a shielding top cover 9, a wire clamping cover 10, a handle 11, a middle cover 12, the shielding cavity body 13, and a shielding bottom cover 14. The high-performance electromagnetic shielding module employs professional electromagnetic shielding design, a suitable structural form, and high-performance shielding materials, effectively suppressing electromagnetic leakage and external electromagnetic interference. It fully meets the stringent requirements of the system for high-performance electromagnetic compatibility and electromagnetic shielding, ensuring the fidelity of signal transmission.

[0032] This invention also discloses a time-frequency coordinated multi-standard signal fiber optic fusion transmission method, comprising the following steps: S1. External reference clock, second pulse, synchronous trigger and gigabit network signal are input to time and frequency distribution board 1 via SMA connector 2; S2, the clock phase-locked loop and frequency multiplier module performs phase-locked loop and frequency multiplication processing on the external reference clock, and outputs the clock signal to the Ref_clk allocation module and the FPGA main control module; S3, the FPGA main control module performs logic processing on the input signals, outputs a synchronous trigger signal to the Trig distribution module, outputs a network signal to the 1GbE distribution module, outputs a second pulse signal to the 1PPS distribution module, and outputs a synchronous noise source control signal; The S4, Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module perform multi-channel synchronous distribution of the corresponding signals respectively; S5, the fiber optic aggregation output module aggregates the distributed reference clock, synchronous trigger, gigabit network, and second pulse signals into fiber optic signals, which are then output via QSFP+ connector 3; S6, the power supply and heat dissipation module supplies power to and dissipates heat from the time-frequency distribution board 1, and the high-performance electromagnetic shielding module performs electromagnetic shielding on the internal components.

[0033] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A time-frequency coordinated multi-standard signal fiber optic fusion transmission system, characterized in that, include: The module includes a time-frequency distribution module, a power supply and heat dissipation module, and a high-performance electromagnetic shielding module; among which, The time-frequency distribution module is used to aggregate external reference clock, second pulse, synchronization trigger and gigabit network signals and convert them into fiber optic network signals for output; The power supply and heat dissipation module is used to supply power to the system and provide heat dissipation protection; High-performance electromagnetic shielding modules are used to suppress electromagnetic leakage and external electromagnetic interference, meeting the system's electromagnetic compatibility and shielding requirements.

2. The time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to claim 1, characterized in that, The time-frequency distribution module includes a time-frequency distribution board, an SMA connector, and a QSFP+ connector; The SMA connector serves as the input interface for external reference clock, second pulse, synchronous trigger, and gigabit network signals. The QSFP+ connector serves as the output interface for fiber optic network signals, supporting up to 20 simultaneous outputs.

3. The time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to claim 2, characterized in that, The time-frequency distribution board includes a clock phase-locked loop frequency multiplier module, an FPGA main control module, a Ref_clk distribution module, a Trig distribution module, a 1GbE distribution module, a 1PPS distribution module, and a fiber aggregation output module; The output of the clock phase-locked loop frequency multiplier module is connected to the input of the Ref_clk allocation module and the clock input of the FPGA main control module, respectively. The signal terminals of the FPGA main control module are connected to the input terminals of the Trig distribution module, the 1GbE distribution module, and the 1PPS distribution module, respectively. The outputs of the Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module are all connected to the input of the fiber aggregation output module.

4. The time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to claim 3, characterized in that, The FPGA main control module is equipped with a noise source control signal output terminal, and the noise source control signal is output with the rising edge of the 1PPS signal as the trigger point.

5. A time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to claim 3, characterized in that, The Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module all support up to 20 channels of synchronous signal output.

6. The time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to claim 1, characterized in that, The power supply and heat dissipation module includes a power supply module, a power connector, a centrifugal fan, and heat sink fins; The power module is connected to an external power source via a power connector, and the centrifugal fan and heat sink fins are arranged on a corresponding time-frequency distribution board.

7. The time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to claim 1, characterized in that, The high-performance electromagnetic shielding module includes a high-performance electromagnetic shielding cavity, a feedthrough capacitor, and a filter; The feedthrough capacitor and filter are installed on the wall of the high-performance electromagnetic shielding cavity, and the internal terminals of the feedthrough capacitor and filter are connected to the time-frequency distribution module, while the external terminals are used to receive external signals.

8. A time-frequency coordinated multi-standard signal fiber optic fusion transmission method, characterized in that... The application of the time-frequency coordinated multi-standard signal fiber optic fusion transmission system according to any one of claims 1-7 includes the following steps: S1, external reference clock, second pulse, synchronous trigger and gigabit network signal are input to the time and frequency distribution board via SMA connector; S2, the clock phase-locked loop and frequency multiplier module performs phase-locked loop and frequency multiplication processing on the external reference clock, and outputs the clock signal to the Ref_clk allocation module and the FPGA main control module; S3, the FPGA main control module performs logic processing on the input signals, outputs a synchronous trigger signal to the Trig distribution module, outputs a network signal to the 1GbE distribution module, outputs a second pulse signal to the 1PPS distribution module, and outputs a synchronous noise source control signal; The S4, Ref_clk allocation module, Trig allocation module, 1GbE allocation module, and 1PPS allocation module perform multi-channel synchronous distribution of the corresponding signals respectively; S5, the fiber aggregation output module aggregates the distributed reference clock, synchronous trigger, gigabit network, and second pulse signals into fiber optic signals, which are then output via a QSFP+ connector; S6, the power supply and heat dissipation module supplies power to and dissipates heat from the time-frequency distribution board, and the high-performance electromagnetic shielding module performs electromagnetic shielding on the internal components.

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