A high-precision positioning signal test system based on an SDR platform

Abstract

The application belongs to the technical field of navigation positioning, and specifically provides a high-precision positioning signal test system based on a software-defined radio (SDR) platform, which comprises a transmitting module, a receiving module, a demodulation and analysis module and a power module; the transmitting module generates positioning signals and transmits them into space; the receiving module receives the positioning signals and performs digital processing; the demodulation and analysis module demodulates and analyzes the digital signals after digital processing, extracts positioning messages, and evaluates signal coverage performance and positioning accuracy; and the power module supplies power to each module; as described above, the application can realize the modulation and demodulation of Beidou signal systems and the processing of navigation signals on the SDR platform, receive and process positioning signals in the 4800MHz-4900MHz frequency band, extract navigation positioning messages, and evaluate signal coverage performance and positioning accuracy.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of navigation positioning, and particularly provides a high-precision positioning signal test system based on a software-defined radio (SDR) platform. BACKGROUND

[0002] The existing high-precision positioning system is difficult to achieve stable positioning signal coverage in complex terrain and areas with large elevation differences; the traditional positioning signal test method lacks flexibility and is difficult to adapt to the needs of different frequency bands and signal systems; the SDR system can effectively solve these problems due to its programmability and flexibility, therefore, the application provides a high-precision positioning signal test system based on an SDR platform. SUMMARY

[0003] The application aims to provide a high-precision positioning signal test system based on an SDR platform, to realize the modulation and demodulation of Beidou signal systems and navigation signal processing on the SDR platform, and to receive and process positioning signals and extract navigation positioning messages in the 4800MHz-4900MHz frequency band.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] A high-precision positioning signal test system based on an SDR platform, comprising a transmitting module, a receiving module, a demodulation and analysis module, and a power module; characterized in that the transmitting module generates positioning signals and transmits them into space, the receiving module receives the positioning signals and performs digital processing, the demodulation and analysis module demodulates and analyzes the digital signals after digital processing, extracts positioning messages, and evaluates signal coverage performance and positioning accuracy, and the power module supplies power to each module.

[0006] Further, the transmitting module comprises an SDR transmitting platform and a transmitting antenna, and the SDR transmitting platform is composed of a transmitting-end programmable radio frequency front end and a transmitting-end signal processor; the transmitting-end signal processor writes a positioning signal transmitting program, sets the transmitting frequency band to 4800MHz-4900MHz, and generates positioning signals; the generated positioning signals are modulated by the transmitting-end programmable radio frequency front end, and then transmitted into space by the transmitting antenna after modulation.

[0007] Further, the receiving module comprises a receiving antenna and an SDR receiving platform, and the SDR receiving platform is composed of a receiving-end programmable radio frequency front end and a receiving-end signal processor; the receiving antenna receives the positioning signals emitted from the transmitting module, the received signals are amplified and filtered by the receiving-end programmable radio frequency front end, the processed signals are transmitted to the receiving-end signal processor for digital processing, and then transmitted to the demodulation and analysis module.

[0008] Further, the demodulation and analysis module comprises a demodulation module and an analysis module; the demodulation module demodulates the received digital signal and extracts the positioning message; the analysis module models the extracted positioning message and evaluates the signal coverage performance and positioning accuracy.

[0009] Further, the power module adopts a lithium battery pack or an external power adapter for power supply.

[0010] Based on the above technical solution, the application has the following beneficial effects:

[0011] The application provides a high-precision positioning signal test system based on an SDR platform, which can realize the modulation and demodulation of a Beidou signal system and the processing of a navigation signal on the SDR platform, receive and process positioning signals in a frequency band of 4800 MHz to 4900 MHz, extract navigation positioning messages, and evaluate the signal coverage performance and positioning accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a structural block diagram of the high-precision positioning signal test system based on the SDR platform in the application.

[0013] Figure 2 FIG. 2 is a structural block diagram of the transmitting module of the high-precision positioning signal test system based on the SDR platform in the application.

[0014] Figure 3 FIG. 3 is a structural block diagram of the receiving module of the high-precision positioning signal test system based on the SDR platform in the application.

[0015] Figure 4 FIG. 4 is a structural block diagram of the demodulation and analysis module of the high-precision positioning signal test system based on the SDR platform in the application. DETAILED DESCRIPTION

[0016] To make the object, technical solution and beneficial effects of the application clearer, the application is further described in detail below with reference to the drawings and examples.

[0017] The embodiment provides a high-precision positioning signal test system based on an SDR platform, which has the structure as shown in FIG. 1 and comprises a transmitting module, a receiving module, a demodulation and analysis module and a power module, and each module is connected through a cable or wirelessly to form a complete test system. Figure 1 The transmitting module generates positioning signals and sends them into space, the receiving module receives the positioning signals and processes them digitally, the demodulation and analysis module demodulates and analyzes the digital signals after digital processing, extracts positioning messages, and evaluates the signal coverage performance and positioning accuracy.

[0018] The transmitting module can be a frequency modulation module or a phase modulation module.Figure 2 As shown, it comprises: an SDR transmitting platform and a transmitting antenna, the SDR transmitting platform is composed of a transmitting end programmable radio frequency front end and a transmitting end signal processor; specifically: the transmitting end signal processor writes a positioning signal transmitting program, sets the transmitting frequency band as 4800MHz-4900MHz, and generates a positioning signal; the generated positioning signal is modulated by the transmitting end programmable radio frequency front end, and after modulation, it is sent to space through the transmitting antenna.

[0019] The receiving module comprises: Figure 3 As shown, it comprises: a receiving antenna and an SDR receiving platform, the SDR receiving platform is composed of a receiving end programmable radio frequency front end and a receiving end signal processor; specifically: the receiving antenna receives the positioning signal emitted from the transmitting module, the received signal is amplified and filtered by the receiving end programmable radio frequency front end, the processed signal is transmitted to the receiving end signal processor for digital processing, and then transmitted to the demodulation and analysis module.

[0020] The demodulation and analysis module comprises: Figure 4 As shown, it comprises: a demodulation module and an analysis module; the demodulation module demodulates the received digital signal and extracts the positioning message; the analysis module models the extracted positioning message and evaluates the coverage performance and positioning accuracy of the signal.

[0021] The power module provides the required power for each part of the system, ensures the normal operation of the system, and can use lithium battery packs or external power adapters for power supply.

[0022] The above is only a specific embodiment of the present application, any feature disclosed in the specification can be replaced by other equivalent or similar purpose alternative features unless specifically described; all features disclosed, or steps in all methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A high-precision positioning signal testing system based on an SDR platform, comprising: The system comprises a transmitting module, a receiving module, a demodulation and analysis module, and a power supply module; characterized in that the transmitting module generates a positioning signal and transmits it into space, the receiving module receives the positioning signal and performs digital processing, the demodulation and analysis module demodulates and analyzes the digitally processed digital signal, extracts the positioning message, and evaluates the signal coverage performance and positioning accuracy, and the power supply module provides power to each module. The transmitting module includes an SDR transmitting platform and a transmitting antenna. The SDR transmitting platform consists of a transmitting programmable radio frequency front-end and a transmitting signal processor. The transmitting signal processor writes a positioning signal transmission program, sets the transmitting frequency band to 4800 MHz ~ 4900 MHz, and generates a positioning signal. The generated positioning signal is modulated by the transmitting programmable radio frequency front-end and then transmitted into space through the transmitting antenna. The receiving module includes a receiving antenna and an SDR receiving platform. The SDR receiving platform consists of a receiving programmable radio frequency front-end and a receiving signal processor. The receiving antenna receives the positioning signal emitted from the transmitting module. The received signal is amplified and filtered by the receiving programmable radio frequency front-end. The processed signal is transmitted to the receiving signal processor for digital processing and then transmitted to the demodulation and analysis module.

2. The high-precision positioning signal testing system based on the SDR platform according to claim 1, characterized in that, The demodulation and analysis module includes a demodulation module and an analysis module; the demodulation module demodulates the received digital signal and extracts the positioning message; the analysis module models the extracted positioning message and evaluates the signal coverage performance and positioning accuracy.

3. The high-precision positioning signal testing system based on the SDR platform according to claim 1, characterized in that, The power module is powered by a lithium battery pack or an external power adapter.

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