High-precision positioning signal test system based on SDR platform

Abstract

The invention belongs to the technical field of navigation and positioning, and particularly provides a high-precision positioning signal testing 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 supply module, the system is characterized in that the transmitting module generates a positioning signal and sends the positioning signal to a space, the receiving module receives the positioning signal and carries out digital processing, and the demodulation and analysis module demodulates and analyzes the digital signal after digital processing, extracts a positioning message and carries out signal coverage performance and positioning precision evaluation. The power supply module supplies power to each module; in conclusion, modulation and demodulation of a Beidou signal system and navigation signal processing can be achieved on an SDR platform, positioning signals are received and processed within the frequency band of 4800 MHz to 4900 MHz, navigation positioning messages are extracted, and meanwhile signal coverage performance and positioning precision are evaluated.

Description

Technical Field

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

[0002] Existing high-precision positioning systems find it difficult to achieve stable positioning signal coverage in areas with complex terrain and large elevation differences; traditional positioning signal testing methods lack flexibility and are 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 present invention proposes a high-precision positioning signal testing system based on the SDR platform. Summary of the invention

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

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A high-precision positioning signal test system based on an SDR platform comprises: a transmitting module, a receiving module, a demodulation and analysis module and a power supply module; the characteristic is that the transmitting module generates a positioning signal and sends it into space, the receiving module receives the positioning signal and performs digital processing, the demodulation and analysis module demodulates and analyzes the digital signal after digital processing, extracts the positioning message, and evaluates the signal coverage performance and positioning accuracy, and the power supply module supplies power to each module.

[0006] Furthermore, the transmitting module includes: an SDR transmitting platform and a transmitting antenna, wherein the SDR transmitting platform is composed of a transmitting end programmable RF front end and a transmitting end signal processor; the transmitting end signal processor writes a positioning signal transmission program, sets the transmitting frequency band to 4800MHz~4900MHz, and generates a positioning signal; the generated positioning signal is modulated by the transmitting end programmable RF front end, and after modulation, is sent into space through the transmitting antenna.

[0007] Furthermore, the receiving module includes: a receiving antenna and an SDR receiving platform, and the SDR receiving platform is composed of a receiving-end programmable RF front end and a receiving-end signal processor; the receiving antenna receives the positioning signal sent from the transmitting module, and the received signal is amplified and filtered by the receiving-end programmable RF front end, and the processed signal is transmitted to the receiving-end signal processor for digital processing, and then transmitted to the demodulation and analysis module.

[0008] Furthermore, 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.

[0009] Furthermore, the power module is powered by a lithium battery pack or an external power adapter.

[0010] Based on the above technical solution, the beneficial effects of the present invention are:

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

[0012] Figure 1 It is a structural block diagram of the high-precision positioning signal testing system based on the SDR platform in the present invention.

[0013] Figure 2 It is a structural block diagram of the transmitting module of the high-precision positioning signal testing system based on the SDR platform in the present invention.

[0014] Figure 3 It is a structural block diagram of the receiving module of the high-precision positioning signal testing system based on the SDR platform in the present invention.

[0015] Figure 4 It 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 present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0017] This embodiment provides a high-precision positioning signal test system based on an SDR platform, and its structure is as follows: Figure 1 As shown, it includes: a transmitting module, a receiving module, a demodulation and analysis module and a power supply module. The modules are connected by cables or wirelessly to form a complete test system; the transmitting module generates a positioning signal and sends it to space, the receiving module receives the positioning signal and performs digital processing, the demodulation and analysis module demodulates and analyzes the digital signal after digital processing, extracts the positioning message, and evaluates the signal coverage performance and positioning accuracy.

[0018] The transmitting module is as follows Figure 2 As shown, it includes: an SDR transmitting platform and a transmitting antenna, and the SDR transmitting platform is composed of a transmitting end programmable RF front end and a transmitting end signal processor; specifically: the transmitting end signal processor writes a positioning signal transmission program, sets the transmitting frequency band to 4800MHz~4900MHz, and generates a positioning signal; the generated positioning signal is modulated by the transmitting end programmable RF front end, and after modulation, it is sent into space through the transmitting antenna.

[0019] The receiving module is as follows Figure 3 As shown, it includes: a receiving antenna and an SDR receiving platform, and the SDR receiving platform is composed of a receiving end programmable RF front end and a receiving end signal processor; specifically: the receiving antenna receives the positioning signal sent from the transmitting module, the received signal is amplified and filtered by the receiving end programmable RF front end, and 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 is as follows Figure 4 As shown, it 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 coverage performance and positioning accuracy of the signal.

[0021] The power module provides the required electrical energy for each part of the system to ensure the normal operation of the system, and can be powered by a lithium battery pack or an external power adapter.

[0022] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all the disclosed features, or all the steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A high-precision positioning signal test system based on an SDR platform, comprising: Transmitting module, receiving module, demodulation and analysis module and power supply module; characterized in that the transmitting module generates a positioning signal and sends it into space, the receiving module receives the positioning signal and performs digital processing, the demodulation and analysis module demodulates and analyzes the digital signal after digital processing, extracts the positioning message, and evaluates the signal coverage performance and positioning accuracy, and the power supply module supplies power to each module.

2. According to the high-precision positioning signal test system based on the SDR platform of claim 1, it is characterized in that: The transmitting module includes: 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. The transmitting end signal processor writes a positioning signal transmitting program, sets the transmitting frequency band to 4800MHz to 4900MHz, and generates a positioning signal. The generated positioning signal is modulated by the transmitting end programmable radio frequency front end, and after modulation, is sent into space through the transmitting antenna.

3. According to the high-precision positioning signal test system based on the SDR platform of claim 1, it is characterized in that: The receiving module includes: a receiving antenna and an SDR receiving platform, and the SDR receiving platform is composed of a receiving end programmable RF front end and a receiving end signal processor; the receiving antenna receives the positioning signal sent from the transmitting module, and the received signal is amplified and filtered by the receiving end programmable RF front end, and the processed signal is transmitted to the receiving end signal processor for digital processing, and then transmitted to the demodulation and analysis module.

4. The high-precision positioning signal test 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 coverage performance and positioning accuracy of the signal.

5. According to the high-precision positioning signal test system based on the SDR platform of claim 1, it is characterized in that: The power module is powered by a lithium battery pack or an external power adapter.

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