A high-capacity, anti-interference ultra-wideband positioning method based on narrowband communication assistance

Abstract

The present invention proposes a high-capacity, anti-interference ultra-wideband positioning method based on narrowband communication assistance, which generates an ultra-wideband positioning signal assisted by narrowband communication to locate the target node. The signal has the following characteristics: the ultra-wideband positioning signal is divided into a pilot unit and a data unit. The data unit includes networking information such as network entry and exit control and node identity, and is transmitted via a narrowband communication signal; the pilot unit is designed to complete the acquisition of positioning information such as time delay estimation and angle measurement, and is still transmitted via an ultra-wideband signal with high measurement accuracy. This achieves the design of an ultra-short frame positioning signal, increases the number of users, and completes high-capacity positioning; extends the incoherent integration time, reduces the demodulation threshold, and improves the signal's anti-interference capability. In other words, positioning performance is improved by means of communication-guide fusion and communication assistance.

Description

Technical Field

[0001] The present invention relates to the fields of navigation positioning and communication, and in particular to a large-capacity anti-interference ultra-wideband positioning method based on narrowband communication assistance. Background Art

[0002] Generally speaking, satellite positioning systems such as GPS can provide high-precision location information worldwide. However, in certain scenarios, such as indoors, in mines, in forests and other complex environments, satellite signals are blocked and weakened, making it impossible to achieve high-capacity, highly reliable network positioning.

[0003] Ultra-wideband positioning methods are currently widely used in indoor and underground environments, but their shortcomings, such as insufficient node capacity and poor anti-interference capabilities, remain significant. Communication systems offer advantages such as wide coverage and strong stability. Using communication systems to assist positioning can effectively improve location-based service capabilities. Summary of the Invention

[0004] In view of this, the present invention proposes a large-capacity anti-interference ultra-wideband positioning method based on narrowband communication assistance, which uses narrowband communication signals to assist in transmitting positioning data information, reduce positioning signal overhead, realize ultra-short frame structure design, and improve user capacity.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The high-capacity anti-interference ultra-wideband positioning method based on narrowband communication assistance includes the following steps:

[0007] (1) The network service layer of the UWB positioning system transmits network positioning control data including user access control, base station networking control, and node identity to the physical layer to form a data unit; the physical layer generates a synchronization header for measuring positioning information such as time delay and angle to form a pilot unit;

[0008] (2) At the transmitting end, the data unit is modulated and encoded and transmitted using a narrowband communication signal; a pilot unit consisting of a synchronization header is added to the ultra-wideband signal, framed, and transmitted;

[0009] (3) At the receiving end, the narrowband communication signal is demodulated to obtain network positioning control data; the ultra-wideband positioning signal is demodulated to obtain positioning measurement information including delay and angle; then, the network positioning control data and positioning measurement information are handed over to the network service layer for information integration and processing, and the positioning information including distance measurement and angle measurement between each node is obtained, which is calculated through the network collaborative positioning method to realize the positioning of the network node.

[0010] Wherein, in step (1), the synchronization header is composed of SYNC and SFD fixed data in the ultra-wideband protocol.

[0011] Wherein, in step (2), the ultra-wideband signal composed of the synchronization header is designed as an ultra-short frame structure.

[0012] Compared with the background technology, the present invention has the following advantages:

[0013] (1) The integrated communication and positioning design of the present invention can solve the communication and positioning service problems in satellite navigation blind areas.

[0014] (2) The ultra-wideband positioning method using communication signals to assist the proposed invention improves the reliability of positioning services and the signal anti-interference capability.

[0015] (3) The ultra-wideband positioning method using communication signals to assist the user improves user capacity and achieves large-capacity positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the ultra-wideband positioning method based on narrowband communication assistance of the present invention.

[0017] Figure 2 This is a flow chart of the ultra-wideband positioning method based on narrowband communication assistance of the present invention. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-2 The present invention is further described with specific embodiments.

[0019] The high-capacity, anti-interference ultra-wideband positioning method based on narrowband communication assistance, drawing on the existing UWB international standard (IEEE 802.15.4-2020), adopts narrowband communication assistance and ultra-short frame structure design to achieve high-capacity, high-precision positioning. The specific steps include:

[0020] (1) The network service layer of the UWB positioning system transmits self-organizing network positioning data information including user access control, base station networking control, and node identity to the physical layer to form a data unit; the physical layer generates a synchronization header for time delay measurement to form a pilot unit;

[0021] The physical layer frame structure in the existing UWB standard consists of a synchronization header, a delimiter, a frame header, and a data payload. The synchronization header consists of a synchronization field (SYNC) and a start-of-frame delimiter (SFD), and the data payload comes from the data PSDU of the network service layer. During the data generation phase at the transmitter, the ultra-wideband positioning system designed in this invention, which is based on narrowband communication assistance, transmits self-organizing network positioning data information (data units) such as user access control, base station networking control, and node identity to the physical layer. The physical layer of this system generates a synchronization header (pilot unit) for time delay measurement, which is composed of fixed data such as SYNC and SFD in the traditional ultra-wideband protocol.

[0022] (2) At the transmitting end, the data unit is modulated and encoded and transmitted using a narrowband communication signal; a pilot unit consisting of a synchronization header is added to the ultra-wideband signal, framed, and transmitted;

[0023] In the embodiment, during the signal modulation and transmission phase, unlike the traditional ultra-wideband positioning system signal transmission method, the present invention introduces a narrowband communication system to assist in positioning. The data unit is transmitted by the communication signal through modulation and coding using the narrowband communication system. The pilot unit composed of the synchronization header is modulated onto the ultra-wideband using OOK modulation to form an ultra-wideband positioning signal with an ultra-short frame structure and then transmitted. Taking a time-division multiple access signal system with a pulse repetition frequency of 1MHz, 16 SYNC pulses, and a maximum PSDU value of 1016us as an example, the data frame length of the existing ultra-wideband signal system is 1070us, and approximately 934.5 time slots can be transmitted per second. The ultra-wideband signal based on narrowband communication assistance in the present invention has a frame length of 32us, and approximately 31,250 time slots can be transmitted per second, and its user capacity is expanded by approximately 29.2 times, thereby achieving the design of an ultra-short frame structure and improving user capacity.

[0024] (3) At the receiving end, the narrowband communication signal is demodulated to obtain the network control information; the ultra-wideband positioning signal is demodulated to obtain the positioning information including delay and angle; then, the positioning information and the networking control information are handed over to the network service layer for information integration and processing, and the positioning information including distance measurement and angle measurement between each node is obtained, which is calculated through the network collaborative positioning method to realize the positioning of the network node.

[0025] In an embodiment, at the receiving end, the system designed by the present invention obtains narrowband communication signals and ultra-wideband positioning signals, and performs data demodulation separately. The pilot unit obtains positioning information such as time delay and angle, and together with the networking control information obtained in the data unit, it is handed over to the network service layer for information integration and processing, and positioning information such as ranging and angle measurement between each node is obtained. The network collaborative positioning method is used for settlement to achieve the positioning of the network node. Because the data unit relies on the narrowband communication signal for transmission, the ultra-wideband signal can modulate more pilot units for positioning information measurement per unit time, realizing the design of the ultra-short frame structure, extending the non-coherent integration time, reducing the demodulation threshold, and improving the signal anti-interference ability and user capacity.

Claims

1. A high-capacity, anti-interference ultra-wideband positioning method based on narrowband communication assistance, characterized in that: The following steps are involved: (1) The network service layer of the UWB positioning system transmits network positioning control data including user access control, base station networking control, and node identity to the physical layer to form a data unit; the physical layer generates a synchronization header for time delay and angle positioning information measurement to form a pilot unit; (2) At the transmitting end, the data unit is modulated and encoded and transmitted using a narrowband communication signal; the pilot unit consisting of the synchronization header is modulated onto the ultra-wideband signal, framed and transmitted; (3) At the receiving end, the narrowband communication signal is demodulated to obtain network positioning control data; the ultra-wideband positioning signal is demodulated to obtain positioning measurement information including delay and angle; then, the network positioning control data and positioning measurement information are handed over to the network service layer for information integration and processing, and the positioning information including distance measurement and angle measurement between each node is obtained, and then calculated through the network collaborative positioning method to realize the positioning of the network node.

2. The high-capacity anti-interference ultra-wideband positioning method based on narrowband communication assistance according to claim 1 is characterized in that: In step (1), the synchronization header is composed of SYNC and SFD fixed data in the ultra-wideband protocol.

3. The high-capacity, anti-interference, ultra-wideband positioning method based on narrowband communication assistance according to claim 1, characterized in that: In step (2), the pilot unit composed of the synchronization header is modulated onto the ultra-wideband signal, and the composed ultra-wideband signal is designed as an ultra-short frame structure.

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