Universal space-time integrated signal processing system

Abstract

The invention discloses a universal space-time integrated signal processing system, and belongs to the technical field of satellite navigation and the technical field of microwave circuit design. According to the invention, the universalization of the system device is realized through the design of customizable hardware, compatible medium and radio frequencies, configurable frequency points, multi-source fusion and the like. Through modular design, hardware customizability is realized; the compatibility of intermediate frequency and radio frequency is realized through the frequency band division design; the configurable frequency points are realized through different frequency bands and different mode configurations; through the design of an integrated inertial navigation assembly and a reserved expansion interface, multi-source fusion of navigation is realized. According to the invention, inter-station time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning calculation of a base station end are simultaneously completed on a single board, and integration of system functions such as time-frequency synchronization, signal broadcasting and space positioning is realized. The application requirements of different complex geographical environments are met through system device generalization and system function integration.

Description

Technical Field

[0001] The invention belongs to the technical field of satellite navigation and microwave circuit design, and in particular relates to a universal time-space integrated signal processing system. Background Art

[0002] With the promotion and use of the global satellite navigation system (GNSS) in various fields, rich demands from different industries and scenarios are constantly being tapped. However, in complex geographical environments, such as indoors, underground, in tunnels, and urban canyons, the positioning accuracy is reduced due to the small number of visible satellites tracked and their poor distribution, weak signals, and susceptibility to interference. As a quasi-GNSS beacon, the pseudo-satellite system fills the blind spots of GNSS navigation and positioning services, and plays a vital role in the positioning needs of complex geographical environments. At present, pseudo-satellite systems face problems such as different requirements, multipath resistance, irregular path heading correction, and anti-interference in their applications in different complex geographical environments.

[0003] In order to balance structural complexity and cost, pseudo-satellite systems usually have a single frequency mode, specific scenario requirements, and stacked interconnection of RF, IF, and TFM modules. The communication systems between modules are different, the module connections are complex, and the crosstalk is large. This leads to a wide variety of pseudo-satellite systems and complex systems. It is difficult to meet the application requirements of different complex geographical environments, which limits the further promotion and use of pseudo-satellite systems. Summary of the invention

[0004] The present invention aims to solve the technical problems existing in the prior art and realize the universalization of system devices through designs such as customizable hardware, compatible intermediate frequency and radio frequency, configurable frequency points, and multi-source fusion. The present invention realizes hardware customizability through modular design; realizes compatibility of intermediate frequency and radio frequency through frequency band design; realizes configurable frequency points through different frequency bands and different mode configurations; and realizes multi-source fusion of navigation through the design of self-integrated inertial navigation components and reserved expansion interfaces. A universal time-space integrated signal processing system of the present invention simultaneously completes time-frequency synchronization between base station terminals, navigation signal broadcasting, and user-side navigation positioning solution on a single board, realizing the integration of system functions such as time-frequency synchronization, signal broadcasting, and spatial positioning. The universalization of system devices and the integration of system functions are intended to meet the application requirements of different complex geographical environments.

[0005] The present invention provides a universal time-space integrated signal processing system, including universal design and integrated design; the universal design includes: customizable hardware; the integrated design includes integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution; The hardware can be customized specifically as follows: the universal time-space integrated signal processing system includes a universal core module and an expandable module, the universal core module includes essential components, and the expandable module includes expandable components; the expandable module is connected to the universal core module through a board-to-board connector; The general core module includes: an FPGA+ARM signal processing and control component, a DDR storage component, an Ethernet communication component, an SRAM storage component and a Flash storage component; the DDR storage component, the Ethernet communication component, the SRAM storage component and the Flash storage component are all connected to the FPGA+ARM signal processing and control component; The expandable modules include: intermediate frequency transceiver components, radio frequency transceiver components, communication components, power components, JTAG components, fusion navigation components and spare components. The expandable modules are selected according to needs. The expandable modules are connected to the FPGA+ARM signal processing and control components. The integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution specifically includes: partitioning the resources of FPGA+ARM signal processing and control components, and completing time-frequency synchronization between base station terminals, navigation signal broadcasting and user-side navigation positioning solution in different zones.

[0006] Preferably, the universal design also includes medium-frequency compatibility, specifically: It also includes an external radio frequency channel, which is connected to the intermediate frequency transceiver component. When the intermediate frequency transceiver component and the radio frequency transceiver component are used, they are connected to the FPGA+ARM signal processing and control component. The intermediate frequency transceiver component includes an analog-to-digital converter ADC and a digital-to-analog converter DAC; the radio frequency transceiver component adopts a radio frequency integrated transceiver chip; the radio frequency channel is an external up-conversion module and a down-conversion module; The intermediate frequency transceiver component processes intermediate frequency signals within the frequency band of 0-70MHz and the back end of the radio frequency channel; the radio frequency transceiver component processes radio frequency signals within the frequency band of 70MHz-6GHz; the radio frequency channel processes the up-conversion and down-conversion of radio frequency signals above 6GHz.

[0007] Preferably, the universal design also includes configurable frequency points. The frequency band 0-70MHz is configured by controlling the intermediate frequency transceiver component through the FPGA+ARM signal processing and control component; the frequency band 70MHz-6.0GHz is configured by connecting the SPI control interface of the FPGA+ARM signal processing and control component with the integrated RF transceiver chip, and the frequency band above 6.0GHz is configured by an external frequency conversion module that customizes the required frequency point.

[0008] Preferably, the universal design also includes multi-source fusion, and the universal space-time integrated signal processing system device itself integrates an inertial navigation component, and is interconnected with the inertial navigation component through the FPGA+ARM signal processing and control component in the core module through an SPI interface, and a fusion navigation expansion interface is reserved on the universal core module FPGA+ARM signal processing and control component.

[0009] Preferably, the expansion interface includes UART, SPI, TTL, and the reserved fusion navigation expansion interface is used to connect the GNSS navigation expansion component and the laser ranging expansion component.

[0010] Preferably, the inter-station time-frequency synchronization is achieved through the following process: the intermediate frequency transceiver component and the radio frequency transceiver component are connected to the FPGA+ARM signal processing and control component, and the FPGA+ARM signal processing and control component and the digital-to-analog converter DAC, the analog low-pass filter, the crystal oscillator A, and the crystal oscillator B form a synchronization link; the crystal oscillator A provides the synchronization link working clock, the FPGA completes the signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to the ARM for clock difference solution to obtain the frequency and phase adjustment amount, and then adjusts the frequency and phase of the local crystal oscillator B through the digital-to-analog converter DAC to achieve inter-station time-frequency synchronization, and the synchronized crystal oscillator B is used as the reference working clock for local signal broadcasting and reception.

[0011] Preferably, the navigation positioning solution is completed through a positioning solution link composed of an intermediate frequency transceiver component, a radio frequency transceiver component, and an FPGA+ARM signal processing and control component. Crystal oscillator B is used as a reference working clock for local signal reception. FPGA completes signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to ARM for navigation positioning solution.

[0012] Preferably, the navigation signal broadcasting is completed through FPGA+ARM signal processing and control components, intermediate frequency transceiver components, and radio frequency transceiver components, wherein ARM realizes navigation message generation, FPGA realizes navigation signal modulation, and the intermediate frequency transceiver components and radio frequency transceiver components convert the digital intermediate frequency signal generated by the FPGA+ARM signal processing and control component into an analog intermediate frequency signal to realize navigation signal broadcasting.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: (1) Customizable hardware: Through modular design, hardware can be made universal and customized, which improves development and production efficiency, enhances the compatibility and versatility of equipment, and reduces maintenance costs.

[0014] (2) IF-RF compatibility. It supports both 0-70MHz IF band and RF bands above 70MHz. Signal processing in the 0-70MHz band is completed by IF components, and 70MHz-6.0GHz RF band is processed by an integrated RF transceiver chip. For bands above 6.0GHz, the RF channel first realizes up and down conversion of signals, and then the IF transceiver components complete the signal processing.

[0015] (3) Configurable frequency. The frequency band of 70MHz-6.0GHz can be customized by configuring the integrated RF transceiver component. The frequency band above 6.0GHz can be customized by connecting the external RF up and down conversion module.

[0016] (4) Multi-source fusion. The design of integrated inertial navigation components and reserved expansion interfaces enables multi-source fusion of navigation, overcomes the limitations of single navigation technology, and improves positioning accuracy and reliability.

[0017] (5) Time and space integration. The base station-to-station time and frequency synchronization, navigation signal broadcasting, and user-side navigation positioning solution are completed on a single board at the same time, realizing the integration of system functions such as time and frequency synchronization, signal broadcasting, and space positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A diagram showing the composition and architecture of a universal time-space integrated signal processing system according to an embodiment of the present invention; Figure 2 A schematic diagram of a customizable hardware design for an embodiment of the present invention; Figure 3 A schematic diagram of a medium-frequency compatible design according to an embodiment of the present invention; Figure 4 A schematic diagram of a configurable frequency design according to an embodiment of the present invention; Figure 5 A schematic diagram of a multi-source fusion design according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a time-space integration design of an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a universal time-space integrated signal processing system, including universal design and integrated design; the universal design includes: customizable hardware; the integrated design includes integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution; The hardware can be customized specifically as follows: the universal time-space integrated signal processing system includes a universal core module and an expandable module, the universal core module includes essential components, and the expandable module includes expandable components; the expandable module is connected to the universal core module through a board-to-board connector; The general core module includes: an FPGA+ARM signal processing and control component, a DDR storage component, an Ethernet communication component, an SRAM storage component and a Flash storage component; the DDR storage component, the Ethernet communication component, the SRAM storage component and the Flash storage component are all connected to the FPGA+ARM signal processing and control component; The expandable modules include: intermediate frequency transceiver components, radio frequency transceiver components, communication components, power components, JTAG components, fusion navigation components and spare components. The expandable modules are selected according to needs. The expandable modules are connected to the FPGA+ARM signal processing and control components. The integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution specifically includes: partitioning the resources of FPGA+ARM signal processing and control components, and completing time-frequency synchronization between base station terminals, navigation signal broadcasting and user-side navigation positioning solution in different zones.

[0021] According to a specific embodiment of the present invention, the universal design also includes medium-frequency compatibility, specifically: It also includes an external radio frequency channel, which is connected to the intermediate frequency transceiver component. When the intermediate frequency transceiver component and the radio frequency transceiver component are used, they are connected to the FPGA+ARM signal processing and control component. The intermediate frequency transceiver component includes an analog-to-digital converter ADC and a digital-to-analog converter DAC; the radio frequency transceiver component adopts a radio frequency integrated transceiver chip; the radio frequency channel is an external up-conversion module and a down-conversion module; The intermediate frequency transceiver component processes intermediate frequency signals within the frequency band of 0-70MHz and the back end of the radio frequency channel; the radio frequency transceiver component processes radio frequency signals within the frequency band of 70MHz-6GHz; the radio frequency channel processes the up-conversion and down-conversion of radio frequency signals above 6GHz.

[0022] According to a specific implementation scheme of the present invention, the universal design also includes configurable frequency points. The frequency band 0-70MHz is configured by controlling the intermediate frequency transceiver component through the FPGA+ARM signal processing and control component; the frequency band 70MHz-6.0GHz is configured by connecting the SPI control interface of the FPGA+ARM signal processing and control component with the integrated RF transceiver chip. The frequency band above 6.0GHz is configured by an external frequency conversion module that customizes the required frequency point.

[0023] According to a specific embodiment of the present invention, the universal design also includes multi-source fusion, and the universal space-time integrated signal processing system device itself integrates an inertial navigation component, and is interconnected with the inertial navigation component through the FPGA+ARM signal processing and control component in the core module through an SPI interface, and a fusion navigation expansion interface is reserved on the universal core module FPGA+ARM signal processing and control component.

[0024] According to a specific implementation of the present invention, the expansion interface includes UART, SPI, and TTL, and the reserved fusion navigation expansion interface is used to connect the GNSS navigation expansion component and the laser ranging expansion component.

[0025] According to a specific implementation scheme of the present invention, the inter-station time-frequency synchronization is achieved through the following process: the intermediate frequency transceiver component and the radio frequency transceiver component are connected to the FPGA+ARM signal processing and control component, and the FPGA+ARM signal processing and control component and the digital-to-analog converter DAC, the analog low-pass filter, the crystal oscillator A, and the crystal oscillator B form a synchronization link; the crystal oscillator A provides the synchronization link working clock, the FPGA completes the signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement result to the ARM for clock difference solution to obtain the frequency and phase adjustment amount, and then adjusts the frequency and phase of the local crystal oscillator B through the digital-to-analog converter DAC to achieve inter-station time-frequency synchronization, and the synchronized crystal oscillator B is used as the reference working clock for local signal broadcasting and reception.

[0026] According to a specific implementation scheme of the present invention, the navigation positioning solution is completed through a positioning solution link composed of an intermediate frequency transceiver component, a radio frequency transceiver component, and an FPGA+ARM signal processing and control component. Crystal oscillator B is used as a reference working clock for local signal reception. FPGA completes signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to ARM for navigation positioning solution.

[0027] According to a specific implementation scheme of the present invention, the navigation signal broadcasting is completed through FPGA+ARM signal processing and control components, intermediate frequency transceiver components, and radio frequency transceiver components, wherein ARM realizes navigation message generation, FPGA realizes navigation signal modulation, and intermediate frequency transceiver components and radio frequency transceiver components convert the digital intermediate frequency signal generated by the FPGA+ARM signal processing and control component into an analog intermediate frequency signal to realize navigation signal broadcasting.

[0028] Example 1 The present invention provides a universal time-space integrated signal processing system, including universal design and integrated design; the universal design includes: customizable hardware; the integrated design includes integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution; The hardware can be customized specifically as follows: the universal time-space integrated signal processing system includes a universal core module and an expandable module, the universal core module includes essential components, and the expandable module includes expandable components; the expandable module is connected to the universal core module through a board-to-board connector; The general core module includes: an FPGA+ARM signal processing and control component, a DDR storage component, an Ethernet communication component, an SRAM storage component and a Flash storage component; the DDR storage component, the Ethernet communication component, the SRAM storage component and the Flash storage component are all connected to the FPGA+ARM signal processing and control component; The expandable modules include: intermediate frequency transceiver components, radio frequency transceiver components, communication components, power components, JTAG components, fusion navigation components and spare components. The expandable modules are selected according to needs. The expandable modules are connected to the FPGA+ARM signal processing and control components. The integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution specifically includes: partitioning the resources of FPGA+ARM signal processing and control components, and completing time-frequency synchronization between base station terminals, navigation signal broadcasting and user-side navigation positioning solution in different zones.

[0029] Example 2 The present invention provides a universal space-time integrated signal processing system, including universal design and integrated design; the universal design includes: customizable hardware, compatible intermediate and radio frequencies, configurable frequency points, and multi-source fusion; the integrated design includes integration of time-frequency synchronization, navigation signal broadcasting, and user-side navigation positioning solution; like Figure 1As shown, the hardware customization is to design the common parts of FPGA+ARM signal processing and control components, intermediate frequency transceiver components, radio frequency transceiver components, FLASH storage components, SRAM storage components, fusion navigation components, DDR3 storage components, Ethernet communication components, communication components, backup components, and power supply components as common core modules, and design the remaining parts as expandable modules, aiming to realize hardware configuration on demand. The expandable modules are connected to the common core modules through board-to-board connectors, such as Figure 2 shown.

[0030] The universal core module includes: FPGA+ARM signal processing and control components, DDR storage components, Ethernet communication components, SRAM storage components and Flash storage components.

[0031] The expandable modules include: intermediate frequency transceiver components, radio frequency transceiver components, communication components, power components, JTAG components, fusion navigation components and spare components. The expandable modules are selected according to needs. The expandable modules are all connected to the FPGA+ARM signal processing and control components.

[0032] The universal space-time integrated signal processing system divides the hardware platform into a three-layer architecture, namely, a component layer, an interface layer, and a processing layer. The component layer includes a power supply component, a JTAG component, a communication component, an expandable component, and the like. The expandable component can be expanded or combined by selecting one or more components according to actual needs. The interface between the universal core module and the expandable module is defined as a power supply interface, a debugging interface, a communication interface, a component interface, and a spare interface. The board-to-board connector is divided into a power supply component connection area, a JTAG component connection area, a communication connection area, an expandable component connection area, and a spare interface connection area. The interface is defined, and the connection area is distinguished, which reduces the need to produce different modules due to component expansion, and produces different boards with low universality, which brings a heavy burden to production and maintenance. The hardware is universalized and customizable through modular design.

[0033] The IF-RF compatibility means that the IF transceiver component and the RF transceiver component are designed as independent IF transceiver components and RF transceiver components. According to application requirements, one of the IF transceiver component or the RF transceiver component can be selected, or both the IF transceiver component and the RF transceiver component can be selected. Alternatively, a combination of RF channel + IF transceiver component + RF transceiver component can be selected. The FPGA + ARM signal processing and control component independently processes the IF and RF signals in the IF transceiver component and the RF transceiver component at the same time. The intermediate frequency transceiver component is composed of a high-speed analog-to-digital converter ADC and a digital-to-analog converter DAC; the radio frequency transceiver component adopts a radio frequency integrated transceiver chip; the radio frequency channel is an external up-conversion and down-conversion module; The intermediate frequency transceiver component processes intermediate frequency signals within the frequency band of 0~70MHz and the back end of the radio frequency channel; the radio frequency transceiver component processes radio frequency signals within the frequency band of 70MHz-6GHz; the radio frequency channel processes radio frequency signals above 6GHz and converts them up and down, such as Figure 3 shown.

[0034] The frequency point can be configured by controlling the intermediate frequency transceiver component through the FPGA+ARM signal processing and control component to achieve frequency point configuration in the frequency band 0~70MHz; the frequency band 70MHz-6.0GHz is configured by configuring the integrated RF transceiver chip through the SPI control interface of the FPGA+ARM signal processing and control component to achieve frequency point configuration. The frequency band above 6.0GHz is configured by externally connecting a frequency conversion module that customizes the required frequency point, such as Figure 4 shown.

[0035] The multi-sources can be integrated, and the inertial navigation component is integrated in the universal space-time integrated signal processing system device itself, and the FPGA+ARM signal processing and control component in the core module is interconnected with the inertial navigation component through the SPI interface, and a fusion navigation expansion interface is reserved on the universal core module FPGA+ARM signal processing and control component, which can be externally connected to GNSS navigation expansion components, laser ranging expansion components, etc. The expansion interface includes UART, SPI, TTL, etc. Figure 5 shown.

[0036] The integration is to complete the time-frequency synchronization between base stations, navigation signal broadcasting and user-side navigation positioning solution on a single board at the same time, realizing the integration of system functions such as time-frequency synchronization, signal broadcasting, and spatial positioning. It supports both high-precision time-frequency synchronization and precise navigation signal broadcasting between base stations and user-side navigation positioning solution. By partitioning the resources of FPGA+ARM signal processing and control components, high-precision time-frequency synchronization between base stations, precise navigation signal broadcasting and user-side navigation positioning solution are completed in different areas, such as Figure 6 shown.

[0037] The inter-station time-frequency synchronization is realized by a synchronization link consisting of an intermediate frequency transceiver component, an RF transceiver component, an FPGA+ARM signal processing and control component, a digital-to-analog converter DAC, an analog low-pass filter, a crystal oscillator A, and a crystal oscillator B. Crystal oscillator A provides a synchronous link working clock, FPGA completes signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to ARM for clock difference resolution and obtains the frequency and phase adjustment amount, and then adjusts the frequency and phase of the local crystal oscillator B through a high-precision digital-to-analog converter DAC to achieve inter-station time-frequency synchronization, and the synchronized crystal oscillator B is used as the reference working clock for local signal broadcasting and reception. Among them, the specific algorithm for FPGA to complete signal capture and tracking to achieve pseudo-range measurement, and transmit the pseudo-range measurement results to ARM for clock difference resolution and obtain the frequency and phase adjustment amount, and then adjusts the frequency and phase of the local crystal oscillator B through a high-precision digital-to-analog converter DAC belongs to the prior art, and does not belong to the content protected by the present invention. Those skilled in the art may choose different implementation methods.

[0038] In the inter-station time and frequency synchronization, the frequency band 70MHz-6.0GHz is processed by an integrated RF transceiver chip for analog signal processing, and the frequency band exceeding 6.0GHz is firstly processed by the RF channel for up- and down-conversion of the signal, and then the IF transceiver component completes the signal processing. The power divider divides the signal output by the crystal oscillator B into multiple paths to provide clocks for other functional units.

[0039] The navigation signal broadcast is mainly composed of FPGA+ARM signal processing and control components, intermediate frequency transceiver components, and radio frequency transceiver components to form a precise navigation signal broadcast link. The frequency band 70MHz-6.0GHz is processed by an integrated radio frequency transceiver chip to complete analog signal processing, and the frequency band exceeds 6.0GHz. The radio frequency channel first realizes up and down frequency conversion of the signal, and then the intermediate frequency transceiver component completes the signal processing. Among them, ARM mainly realizes navigation message generation, FPGA realizes navigation signal modulation, and the intermediate frequency transceiver component and the radio frequency transceiver component convert the digital intermediate frequency signal generated by the FPGA+ARM signal processing and control component into an analog intermediate frequency signal to realize precise navigation signal broadcasting.

[0040] The navigation positioning solution is composed of a positioning solution link consisting of an intermediate frequency transceiver component, a radio frequency transceiver component, and an FPGA+ARM signal processing and control component. The frequency band 70MHz-6.0GHz is processed by an integrated radio frequency transceiver chip to complete analog signal processing, and the frequency band exceeds 6.0GHz. The radio frequency channel first realizes signal up and down conversion, and then the intermediate frequency transceiver component completes signal processing. Crystal oscillator B is used as the reference working clock for local signal reception. FPGA completes signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to ARM for navigation positioning solution. Among them, the specific algorithm in which FPGA completes signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to ARM for navigation positioning solution belongs to the prior art, does not belong to the content protected by the present invention, and technicians in this field can choose different implementation methods. Other calculation processes or algorithms not listed in detail in the present invention belong to the prior art in this field, do not belong to the content protected by the present invention, and technicians in this field can choose different implementation methods.

[0041] Example 3 The present invention provides a universal time-space integrated signal processing system, including universal design and integrated design; the universal design includes: customizable hardware; the integrated design includes integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution; The hardware can be customized specifically as follows: the universal time-space integrated signal processing system includes a universal core module and an expandable module, the universal core module includes essential components, and the expandable module includes expandable components; the expandable module is connected to the universal core module through a board-to-board connector; The general core module includes: an FPGA+ARM signal processing and control component, a DDR storage component, an Ethernet communication component, an SRAM storage component and a Flash storage component; the DDR storage component, the Ethernet communication component, the SRAM storage component and the Flash storage component are all connected to the FPGA+ARM signal processing and control component; The expandable modules include: intermediate frequency transceiver components, radio frequency transceiver components, communication components, power components, JTAG components, fusion navigation components and spare components. The expandable modules are selected according to needs. The expandable modules are connected to the FPGA+ARM signal processing and control components. Among them, Figure 3As shown in the figure, the FPGA+ARM signal processing and control component uses Xilinx ZYNQ7045. ZYNQ7045 includes a programmable logic controller PL and a signal processor (PS). The PS part includes two ARM processing cores, a DDR controller, an Ethernet MAC controller, etc. It has SRAM, FLASH storage interface and communication interface, etc., which meet the design requirements of general core modules. The integrated RF transceiver chip in the RF component uses the AD9364 chip of ADI. AD9364 has a transmit (Tx) and receive (Rx) channel. Each channel integrates various RF, mixing and digital modules, and supports frequency bands from 70MHz to 6.0GHz. The intermediate frequency component is mainly composed of a 12-bit, 500MSPS analog-to-digital converter AD9434 and a 16-bit, 500MSPS digital-to-analog converter AD9783. The FLASH memory chip uses Micron's 1Gb storage capacity N25Q00AA, which is connected to the ZYNQ7045 signal processing and control component through the SPI interface. The SRAM memory chip is S66WVO16M8 from ISSI. The SRAM memory chip is interconnected with the ZYNQ7045 signal processing and control component through the Octal SPI interface. The RF component and the IF component are connected to the ZYNQ7045 signal processing and control component through an optional network.

[0042] The hardware can be customized to form a universal core module with ZYNQ7045 signal processing and control components, DDR3 memory, SRAM buffer and Ethernet communication components. The power supply components, JTAG components, crystal oscillators, medium RF expandable components and spare components form an expandable module, and the universal core module is installed on the expandable module through a board-to-board connector.

[0043] The IF signal can be compatible with the ZYNQ7045 signal processing and control component and the integrated RF transceiver chip AD9364 to achieve RF signal processing in the frequency band of 70MHz to 6.0GHz. RF signals with a frequency band greater than 6.0GHz are converted between RF signals and IF signals through an external RF up / down conversion module, and then the converted IF signals are processed by the ZYNQ7045 signal processing and control component and the IF component. IF signals within the frequency band of 0~70MHz are directly processed by the ZYNQ7045 signal processing and control component and the IF component.

[0044] Frequency point can be configured. The frequency band 70MHz-6.0GHz is designed through the SPI control interface of the universal time-space integrated signal processing system ZYNQ7045 signal processing and control component to configure the integrated RF transceiver chip AD9364 to achieve frequency point configuration. The frequency band above 6.0GHz is configured through an external frequency conversion module with customized required frequency points. The intermediate frequency component supports two general modes of zero intermediate frequency and low intermediate frequency, so as to facilitate the selection and design of external frequency conversion modules.

[0045] The universal space-time integrated signal processing system device in the multi-source fusion design integrates the inertial navigation component LINS16460, and is interconnected with the inertial navigation component LINS16460 through the SPI interface through the ZYNQ7045 signal processing and control component in the core module, and a fusion navigation expansion interface is reserved on the universal core module ZYNQ7045 signal processing and control component, which can be connected to external GNSS navigation expansion components, laser ranging expansion components, etc. The expansion interfaces include UART, SPI, TTL, etc.

[0046] The integrated design partitions the resources of the ZYNQ7045 signal processing and control components, completes high-precision time and frequency synchronization between base station terminals, precise navigation signal broadcasting, and user-side navigation positioning solution in different zones, and realizes the integration of time and frequency synchronization, signal broadcasting, and spatial positioning.

[0047] In the high-precision time and frequency synchronization between stations, the front-end analog reception signal processing is completed by the integrated RF transceiver chip AD9364 in the frequency band of 70MHz-6.0GHz, while the front-end analog signal reception processing is mainly completed by the RF up and down conversion module and the intermediate frequency component in the frequency band above 6.0GHz. The front-end analog signal reception processing, ZYNQ7045 signal processing and control component, 18-bit high-precision voltage output type digital-to-analog converter AD5781, analog low-pass filter, constant temperature crystal oscillator A, constant temperature crystal oscillator B, power divider, etc. constitute the synchronization link. Crystal oscillator A provides the synchronous link working clock. The PL part in the ZYNQ7045 signal processing and control component completes the signal capture and tracking to realize pseudo-range measurement, and transmits the pseudo-range measurement results to the PS part in the ZYNQ7045 signal processing and control component through the AXI bus for clock difference resolution and frequency and phase adjustment. The local constant temperature crystal oscillator B is adjusted in frequency and phase through the high-precision digital-to-analog converter AD5781 to realize time-frequency synchronization between stations. The synchronized constant temperature crystal oscillator B is used as the reference working clock for local signal broadcasting and reception.

[0048] The precision navigation signal broadcasting is mainly composed of ZYNQ7045 signal processing and control components, RF components with a frequency band of 70MHz-6.0GHz, RF up and down conversion modules and intermediate frequency components with a frequency band above 6.0GHz. The PS part of the ZYNQ7045 signal processing and control component mainly realizes the generation of navigation messages, the PL part of the ZYNQ7045 signal processing and control component realizes the modulation of navigation signals, and the intermediate frequency component converts the digital intermediate frequency signal generated by the ZYNQ7045 signal processing and control component into an analog intermediate frequency signal to realize the precision navigation signal broadcasting.

[0049] The integrated RF transceiver chip AD9364 completes the front-end analog reception signal processing in the frequency band of 70MHz-6.0GHz for navigation and positioning solution, while the front-end analog signal reception processing is mainly completed by the RF up-down conversion module and the intermediate frequency component for the frequency band above 6.0GHz. The front-end analog signal reception processing and ZYNQ7045 signal processing and control components form the positioning solution link. The constant temperature crystal oscillator B serves as the reference working clock for local signal reception. The PL part of the ZYNQ7045 signal processing and control component completes the signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to the PS part of the ZYNQ7045 signal processing and control component through the AXI bus for navigation and positioning solution.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A universal time-space integrated signal processing system, characterized in that: It includes universal design and integrated design; the universal design includes: customizable hardware; the integrated design includes the integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution; The hardware can be customized specifically as follows: the universal time-space integrated signal processing system includes a universal core module and an expandable module, the universal core module includes essential components, and the expandable module includes expandable components; the expandable module is connected to the universal core module through a board-to-board connector; The general core module includes: an FPGA+ARM signal processing and control component, a DDR storage component, an Ethernet communication component, an SRAM storage component and a Flash storage component; the DDR storage component, the Ethernet communication component, the SRAM storage component and the Flash storage component are all connected to the FPGA+ARM signal processing and control component; The expandable modules include: intermediate frequency transceiver components, radio frequency transceiver components, communication components, power components, JTAG components, fusion navigation components and spare components. The expandable modules are selected according to needs. The expandable modules are connected to the FPGA+ARM signal processing and control components. The integration of time-frequency synchronization, navigation signal broadcasting and user-side navigation positioning solution specifically includes: partitioning the resources of FPGA+ARM signal processing and control components, and completing time-frequency synchronization between base station terminals, navigation signal broadcasting and user-side navigation positioning solution in different zones.

2. The universal time-space integrated signal processing system according to claim 1, characterized in that: The universal design also includes medium-frequency compatibility, specifically: It also includes an external radio frequency channel, which is connected to the intermediate frequency transceiver component. When the intermediate frequency transceiver component and the radio frequency transceiver component are used, they are connected to the FPGA+ARM signal processing and control component. The intermediate frequency transceiver component includes an analog-to-digital converter ADC and a digital-to-analog converter DAC; the radio frequency transceiver component adopts a radio frequency integrated transceiver chip; the radio frequency channel is an external up-conversion module and a down-conversion module; The intermediate frequency transceiver component processes intermediate frequency signals within the frequency band of 0-70MHz and the back end of the radio frequency channel; the radio frequency transceiver component processes radio frequency signals within the frequency band of 70MHz-6GHz; the radio frequency channel processes the up-conversion and down-conversion of radio frequency signals above 6GHz.

3. The universal time-space integrated signal processing system according to claim 2, characterized in that: The universal design also includes configurable frequency points, and the frequency band 0-70MHz is configured by controlling the intermediate frequency transceiver component through the FPGA+ARM signal processing and control component; The frequency band of 70MHz-6.0GHz is configured by connecting the SPI control interface of the FPGA+ARM signal processing and control component to the integrated RF transceiver chip, and the frequency band above 6.0GHz is configured by an external frequency conversion module that customizes the required frequency.

4. The universal time-space integrated signal processing system according to claim 1, characterized in that: The universal design also includes multi-source fusion. The universal space-time integrated signal processing system device itself integrates an inertial navigation component, and is interconnected with the inertial navigation component through the SPI interface through the FPGA+ARM signal processing and control component in the core module, and a fusion navigation expansion interface is reserved on the universal core module FPGA+ARM signal processing and control component.

5. The universal time-space integrated signal processing system according to claim 4, characterized in that: The expansion interfaces include UART, SPI, and TTL. The reserved fusion navigation expansion interface is used to connect the GNSS navigation expansion component and the laser ranging expansion component.

6. The universal time-space integrated signal processing system according to claim 1, characterized in that: The inter-station time and frequency synchronization is achieved through the following process: the intermediate frequency transceiver component and the radio frequency transceiver component are connected to the FPGA+ARM signal processing and control component, and the FPGA+ARM signal processing and control component and the digital-to-analog converter DAC, the analog low-pass filter, the crystal oscillator A, and the crystal oscillator B form a synchronization link; the crystal oscillator A provides the working clock of the synchronization link, the FPGA completes the capture and tracking of the signal to realize the pseudo-range measurement, and transmits the pseudo-range measurement result to the ARM for clock difference solution to obtain the frequency and phase adjustment amount, and then adjusts the frequency and phase of the local crystal oscillator B through the digital-to-analog converter DAC to achieve inter-station time and frequency synchronization, and the synchronized crystal oscillator B is used as the reference working clock for local signal broadcasting and reception.

7. The universal time-space integrated signal processing system according to claim 6, characterized in that: The navigation and positioning solution is completed through a positioning and solution link composed of an intermediate frequency transceiver component, a radio frequency transceiver component, and an FPGA+ARM signal processing and control component. Crystal oscillator B is used as the reference working clock for local signal reception. FPGA completes signal capture and tracking to achieve pseudo-range measurement, and transmits the pseudo-range measurement results to ARM for navigation and positioning solution.

8. The universal time-space integrated signal processing system according to claim 1, characterized in that: The navigation signal broadcasting is completed through the FPGA+ARM signal processing and control component, the intermediate frequency transceiver component, and the radio frequency transceiver component, wherein the ARM realizes the generation of navigation telegrams, the FPGA realizes the modulation of navigation signals, and the intermediate frequency transceiver component and the radio frequency transceiver component convert the digital intermediate frequency signal generated by the FPGA+ARM signal processing and control component into an analog intermediate frequency signal to realize the navigation signal broadcasting.

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