Monitoring performance enhancing system for remotely identifying ground receiving station in urban environment

Abstract

The invention provides a monitoring performance enhancing system for remotely identifying a ground receiving station in an urban environment, and belongs to the technical field of unmanned aerial vehicle monitoring. Comprising a plurality of omnidirectional receiving antennas, and a metal shielding cover is arranged outside each omnidirectional receiving antenna; a radio frequency enhancement module is arranged on the omnidirectional receiving antenna; the omnidirectional receiving antenna is mounted on the antenna mounting bracket; the omnidirectional receiving antenna is connected with a radio frequency connector of a remote identification ground receiving station host through a radio frequency cable. And the remote identification ground receiving station host receives and analyzes the remote identification signal broadcasted by the omnidirectional receiving antenna to form an information message of the unmanned aircraft, and outputs the information message to the outside. According to the invention, by adding the radio frequency enhancement module and a special installation method, the ground station can effectively shield same-frequency and adjacent-frequency electromagnetic interference from the ground, and meanwhile, the receiving of an air remote identification signal is not reduced, so that the monitoring performance of the remote identification ground receiving station is enhanced.

Description

Technical Field

[0001] The present invention provides a system for enhancing the monitoring performance of a remote identification ground receiving station in an urban environment, belonging to the technical field of UAV monitoring. Background Art

[0002] Unmanned aerial vehicles have been widely used in various fields, but they also pose a great potential safety hazard to low-altitude safety. Public security, civil aviation and other departments need to master the real-time flight situation information of low-altitude unmanned aerial vehicles to ensure low-altitude flight safety.

[0003] In order to achieve omnidirectional monitoring of low-altitude unmanned aerial vehicles with fewer receiving channels, existing remote identification ground receiving stations (hereinafter referred to as ground stations) often receive a large number of interference signals, resulting in a sharp decline in the monitoring performance of the ground stations. In order to reduce the power of interference signals, some ground stations use high-gain directional receiving antennas, which can effectively shield interference signals in some directions, but will enhance the interference signals in the main lobe direction of the antenna, and the interference suppression is not ideal.

[0004] When a remote identification ground receiving station uses a directional antenna to monitor low-altitude unmanned aerial vehicles, the following main disadvantages exist:

[0005] (1) The field of view angle of the directional antenna is small, and more receiving channels are required to achieve omnidirectional reception, resulting in a higher price;

[0006] (2) The directional antenna will enhance the interference signals from the main lobe direction, reducing the monitoring performance of the ground station;

[0007] (3) Compared with an omnidirectional antenna, the directional antenna is larger in size and weight, and has a higher price, resulting in a higher overall construction cost. Summary of the Invention

[0008] The present invention provides a system for enhancing the monitoring performance of a remote identification ground receiving station in an urban environment, which solves the following technical problems:

[0009] In an urban environment, there are a large number of electromagnetic interference signals in the 2.4G frequency band and 5.8G frequency band. The interference signals are closer to the remote identification ground receiving station than the unmanned aerial vehicle and have a greater power, which will seriously affect the reception and analysis of the remote identification signals by the ground station and will seriously reduce the monitoring distance of the ground station.

[0010] The main function of the remote identification ground receiving station is to receive the remote identification signals broadcast by unmanned aerial vehicles, so as to obtain information such as the identity, position, and speed of the unmanned aerial vehicle. However, in an urban environment, a large number of interference signals received by the ground station mainly come from co-frequency signals or adjacent-frequency signals of ground Wi-Fi devices, Bluetooth devices, communication base stations, etc., and there are few such interference signals in the air.

[0011] Therefore, the present invention proposes a system that can effectively suppress the co-frequency and adjacent-frequency interference signals of Wi-Fi, Bluetooth, and communication base stations on the ground in an urban environment, enhance the weak long-distance identification signals of unmanned aerial vehicles in the air, and effectively enhance the monitoring performance of the ground station for unmanned aerial vehicles.

[0012] Specific technical solution of the present invention:

[0013] A system for enhancing the monitoring performance of a remote identification ground receiving station in an urban environment provided by the present invention. The main idea is to add a radio frequency enhancement module and a special installation method, so that the ground station can effectively shield the co-frequency and adjacent-frequency electromagnetic interference from the ground, while not reducing the reception of the long-distance identification signals in the air, thereby enhancing the monitoring performance of the remote identification ground receiving station.

[0014] A system for enhancing the monitoring performance of a remote identification ground receiving station in an urban environment includes a plurality of omnidirectional receiving antennas. A metal shield is provided outside each omnidirectional receiving antenna, and the height of the omnidirectional receiving antenna does not exceed the height of the metal shield; a radio frequency enhancement module is provided on the omnidirectional receiving antenna; the omnidirectional receiving antenna is installed on an antenna mounting bracket;

[0015] Through the radio frequency enhancement module and the metal shield, the ground station can effectively shield the co-frequency and adjacent-frequency electromagnetic interference from the ground, while not reducing the reception of the long-distance identification signals in the air, and enhancing the monitoring performance of the remote identification ground receiving station;

[0016] The omnidirectional receiving antenna is connected to the radio frequency connector of the remote identification ground receiving station host through a radio frequency cable; the remote identification ground receiving station host receives and analyzes the remote identification signals broadcast by the omnidirectional receiving antenna, forms an information message of the unmanned aerial vehicle, and outputs the information message externally.

[0017] Specifically:

[0018] The omnidirectional receiving antenna includes:

[0019] A Bluetooth 4.0 omnidirectional receiving antenna with a receiving frequency band of 2402 MHz to 2480 MHz. A metal shield is required during installation. The antenna is installed in the center of the metal shield, and the top of the antenna is at the same height as the opening of the shield;

[0020] A Bluetooth 5.0 omnidirectional receiving antenna with a receiving frequency band of 2404 MHz to 2478 MHz. A metal shield is required during installation. The antenna is installed in the center of the metal shield, and the top of the antenna is at the same height as the opening of the shield;

[0021] A 2.4G Wi-Fi omnidirectional receiving antenna with a receiving frequency band of 2400 MHz to 2476 MHz. A metal shield is required during installation. The antenna is installed in the center of the metal shield, and the top of the antenna is at the same height as the opening of the shield;

[0022] 5.8G Wi-Fi Omnidirectional Receiving Antenna, with a receiving frequency band of 5725MHz - 5829MHz. A metal shielding cover is required during installation. The antenna is installed in the center of the metal shielding cover, and the top of the antenna is at the same height as the opening of the shielding cover;

[0023] 4G / 5G Communication Antenna, used for communication between the ground station and other devices;

[0024] Beidou Satellite Navigation Antenna, used for self-positioning of the ground station;

[0025] Metal Shielding Cover, the height of the antenna does not exceed the height of the shielding cover. The shielding cover usually adopts a hemispherical or ellipsoidal shape, but is not limited to hemispherical and ellipsoidal shapes. The main function of the metal shielding cover is to optimize the radiation direction, reduce side lobes, shield interference signals from Wi-Fi devices, Bluetooth devices, communication base stations, etc. on the ground, and enhance signals from the air;

[0026] RF Cable. For Bluetooth 4.0, Bluetooth 5.0 and 2.4G Wi-Fi reception, a 2.4G band RF cable is used. For 5.8 Wi-Fi reception, a 5.8G band RF cable is used. The cable length generally does not exceed 2 meters;

[0027] RF Enhancement Module, consisting of a limiter, two band-pass filters, a low-noise amplifier, etc.; The limiter can ensure that the ground station is not burned by malicious strong interference signals; The low-noise amplifier can effectively enhance the reception ability of weak long-distance remote identification signals; The two-stage band-pass filter can effectively suppress adjacent-frequency interference signals, and its passbands are respectively:

[0028] Bluetooth 4.0 RF Enhancement Module: 2402MHz - 2480MHz;

[0029] Bluetooth 5.0 RF Enhancement Module: 2404MHz - 2478MHz;

[0030] 2.4G Wi-Fi RF Enhancement Module: 2400MHz - 2476MHz;

[0031] 5.8G Wi-Fi RF Enhancement Module: 5725MHz - 5829MHz;

[0032] Antenna Mounting Bracket, which can be but is not limited to a ring-shaped mounting bracket, a linear mounting bracket, etc.;

[0033] RF Connector, which can be but is not limited to SMA, N-type connectors, etc.;

[0034] The remote identification ground receiving station host is used to receive and analyze remote identification signals broadcast based on Bluetooth 4.0, Bluetooth 5.0, 2.4G Wi-Fi, and 5.8G Wi-Fi, form information packets of unmanned aerial vehicles, and output the information packets externally.

[0035] The remote identification ground receiving station host is also provided with a power interface 8 for the remote identification ground receiving station to supply power to the ground station through the power interface, and the ground station operates normally.

[0036] The technical solution provided by the present invention can effectively shield Wi-Fi signals, Bluetooth signals, and communication base station signals in the urban environment, and at the same time can effectively enhance the reception and analysis of remote identification signals broadcast by unmanned aerial vehicles in the air, realizing the effective supervision of low-altitude unmanned aerial vehicles. At the same time, after passing through the radio frequency enhancement module, the present invention can effectively suppress out-of-band interference signals, enhance in-band weak target signals, and prevent the ground station from being burned out by malicious strong interference. Under the same complex electromagnetic environment, for the same remote identification ground receiving station, installed in the manner of the present invention, the surveillance distance of unmanned aerial vehicles can be greatly improved, and the signal quality is better, and the target track is more continuous. Brief Description of the Drawings

[0037] Figure 1 It is the installation and erection diagram of the remote identification ground receiving station of the present invention.

[0038] Figure 2 It is the composition diagram of the radio frequency enhancement module of the present invention.

[0039] Figure 3 It is an embodiment of the installation of the remote identification ground receiving station of the present invention. Detailed Description of the Invention

[0040] The specific technical solution of the present invention will be described in combination with the embodiments.

[0041] As Figure 1 shown, a system for enhancing the surveillance performance of a remote identification ground receiving station in an urban environment includes a plurality of omnidirectional receiving antennas 1. A metal shielding cover 2 is provided outside each omnidirectional receiving antenna 1, and the height of the omnidirectional receiving antenna 1 does not exceed the height of the metal shielding cover 2; a radio frequency enhancement module 4 is provided on the omnidirectional receiving antenna 1; the omnidirectional receiving antenna 1 is installed on an antenna mounting bracket 5.

[0042] Through the radio frequency enhancement module 4 and the metal shielding cover 2, the ground station can effectively shield co-frequency and adjacent-frequency electromagnetic interference from the ground, and at the same time does not reduce the reception of remote identification signals in the air, enhancing the surveillance performance of the remote identification ground receiving station.

[0043] The omnidirectional receiving antenna 1 is connected to the RF connector 6 of the host 7 of the remote identification ground receiving station through the RF cable 3; the host 7 of the remote identification ground receiving station receives and analyzes the remote identification signals broadcast by the omnidirectional receiving antenna 1, forms an information message of the unmanned aerial vehicle, and outputs the information message externally.

[0044] As Figure 2 shown, the RF enhancement module 4 includes a limiter, two band-pass filters, and a low-noise amplifier; the limiter ensures that the ground station is not burned by malicious strong interference signals; the low-noise amplifier enhances the receiving ability of weak remote identification signals at a long distance; the two-stage band-pass filter suppresses adjacent-frequency interference signals.

[0045] The present invention will be further described in conjunction with a preferred embodiment. As Figure 3 shown, install the remote identification ground receiving station and its accessories:

[0046] Parameters of the omnidirectional receiving antenna 1:

[0047] The receiving frequency band of the Bluetooth 4.0 omnidirectional receiving antenna is 2400 MHz to 2480 MHz, with a length of 20 cm, a gain of 3 dB, a fiberglass antenna, a standing wave < 1.5, an N-J connector, and is installed in a metal shielding cover;

[0048] The receiving frequency band of the Bluetooth 5.0 omnidirectional receiving antenna is 2400 MHz to 2480 MHz, with a length of 20 cm, a gain of 3 dB, a fiberglass antenna, a standing wave < 1.5, an N-J connector, and is installed in a metal shielding cover;

[0049] The receiving frequency band of the 2.4G Wi-Fi omnidirectional receiving antenna is 2400 MHz to 2480 MHz, with a length of 20 cm, a gain of 3 dB, a fiberglass antenna, a standing wave < 1.5, an N-J connector, and is installed in a metal shielding cover;

[0050] The receiving frequency band of the 5.8G Wi-Fi omnidirectional receiving antenna is 5725 MHz to 5850 MHz, with a length of 20 cm, a gain of 4 dB, a fiberglass antenna, a standing wave < 1.5, an N-J connector, and is installed in a metal shielding cover;

[0051] The 4G cellular network communication antenna is 20 cm long, with a gain of 3 dB, a fiberglass antenna, a standing wave < 1.5, and an N-K connector;

[0052] The Beidou satellite navigation antenna is 20 cm long, with a gain of 3 dB, a fiberglass antenna, a standing wave < 1.5, and an N-K connector;

[0053] The antenna is installed vertically to the ground;

[0054] Parameters of the metal shielding cover 2: Made of aluminum alloy, a semi-ellipsoidal shielding cover with a radius of 20 cm. The opening of the shielding cover is parallel to the ground, and the center of the antenna coincides with the focus of the ellipsoid.

[0055] The RF cable 3 is a general RF cable for 1 GHz to 6 GHz, and the interface is an N-J type connector.

[0056] Parameters of the RF enhancement module 4:

[0057] Bluetooth 4.0 RF enhancement module: The maximum output signal after limiter limiting is 0 dBm. The passband of the bandpass filter is 2400 MHz to 2480 MHz, the stopband attenuation is 50 dB, the gain of the low-noise amplifier is 17 dB, the noise figure is <1 dB, and the interface is an N-K type connector.

[0058] Bluetooth 5.0 RF enhancement module: The maximum output signal after limiter limiting is 0 dBm. The passband of the bandpass filter is 2400 MHz to 2480 MHz, the stopband attenuation is 50 dB, the gain of the low-noise amplifier is 17 dB, the noise figure is <1 dB, and the interface is an N-K type connector.

[0059] 2.4G Wi-Fi RF enhancement module: The maximum output signal after limiter limiting is 0 dBm. The passband of the bandpass filter is 2400 MHz to 2480 MHz, the stopband attenuation is 50 dB, the gain of the low-noise amplifier is 17 dB, the noise figure is <1 dB, and the interface is an N-K type connector.

[0060] 5.8G Wi-Fi RF enhancement module: The maximum output signal after limiter limiting is 0 dBm. The passband of the bandpass filter is 5725 MHz to 5850 MHz, the stopband attenuation is 50 dB, the gain of the low-noise amplifier is 17 dB, the noise figure is <1.2 dB, and the interface is an N-K type connector.

[0061] The antenna mounting bracket 5 uses a circular ring bracket, which can effectively fix the antenna, shielding cover and RF enhancement module. The ground station is installed on the roof of a relatively high building in the city. The height of the mounting bracket is not less than 5 meters, the radius of the circular ring is 1 meter, and the bracket is equipped with a lightning rod with a length of not less than 1 meter.

[0062] The RF connector 6 is an N-J type connector.

[0063] Functions of the remote identification ground receiving station host 7:

[0064] It can receive and analyze remote identification data broadcast based on Bluetooth 4.0 (2402 MHz to 2480 MHz), form real-time dynamic message information for unmanned aerial vehicles, and the RF interface is N-K.

[0065] It can receive and parse remote identification data broadcast based on Bluetooth 5.0 (2404 MHz - 2478 MHz) to form real-time dynamic message information of unmanned aerial vehicles. The RF interface is N-K;

[0066] It can receive and parse remote identification data broadcast based on 2.4G Wi-Fi (2400 MHz - 2476 MHz). The RF interface is N-K;

[0067] It can receive and parse received remote identification data broadcast based on 5.8G Wi-Fi (5725 MHz - 5829 MHz). The RF interface is N-K;

[0068] The RF interface of 4G cellular network communication is N-K;

[0069] The RF interface of Beidou satellite navigation is N-K;

[0070] It can perform device power-on self-check and periodic self-check;

[0071] It can communicate through Ethernet and 4G cellular network, and output the working status information of the remote identification ground receiving station and the surveillance information of unmanned aerial vehicles;

[0072] It can perform remote maintenance, parameter configuration, software update and upgrade.

[0073] The remote identification ground receiving station is powered by a POE power interface.

[0074] Working process of the remote identification ground receiving station:

[0075] After installing and erecting the remote identification ground receiving station, antenna, shielding cover, and RF enhancement module, connect the RF cable;

[0076] Connect the POE power to the power interface 8 of the remote identification ground receiving station to supply power to the ground station. The ground station automatically starts the program and enters the working state, including self-check, receiving remote identification signals, encapsulating unmanned aerial vehicle information, and outputting the ground station status information and unmanned aerial vehicle surveillance information through 4G cellular network.

Claims

1. A system for enhancing the monitoring performance of a remote identification ground receiving station in an urban environment, characterized in that, It includes a plurality of omnidirectional receiving antennas (1). A metal shielding cover (2) is provided outside each omnidirectional receiving antenna (1), and the height of the omnidirectional receiving antenna (1) does not exceed the height of the metal shielding cover (2). A radio frequency enhancement module (4) is provided on the omnidirectional receiving antenna (1). The omnidirectional receiving antenna (1) is installed on an antenna mounting bracket (5). Through the radio frequency enhancement module (4) and the metal shielding cover (2), the ground station can effectively shield the co-frequency and adjacent-frequency electromagnetic interference from the ground, and at the same time does not reduce the reception of the long-distance identification signals in the air, enhancing the monitoring performance of the long-distance identification ground receiving station. The omnidirectional receiving antenna (1) is connected to the radio frequency connector (6) of the long-distance identification ground receiving station host (7) through a radio frequency cable (3). The long-distance identification ground receiving station host (7) receives and analyzes the long-distance identification signals broadcast by the omnidirectional receiving antenna (1), forms an information message of the unmanned aerial vehicle, and outputs the information message externally.

2. The enhanced system for monitoring the performance of a remote identification ground receiving station in an urban environment according to claim 1, wherein The omnidirectional receiving antenna (1) includes: A Bluetooth 4.0 omnidirectional receiving antenna with a receiving frequency band of 2402 MHz to 2480 MHz; A Bluetooth 5.0 omnidirectional receiving antenna with a receiving frequency band of 2404 MHz to 2478 MHz; A 2.4G Wi-Fi omnidirectional receiving antenna with a receiving frequency band of 2400 MHz to 2476 MHz; A 5.8G Wi-Fi omnidirectional receiving antenna with a receiving frequency band of 5725 MHz to 5829 MHz; A 4G / 5G communication antenna for communication between the ground station and other devices; A Beidou satellite navigation antenna for the self-positioning of the ground station.

3. The enhanced system for monitoring the performance of a remote identification ground receiving station in an urban environment according to claim 1, wherein The radio frequency enhancement module (4) includes a limiter, two band-pass filters, and a low-noise amplifier. The limiter ensures that the ground station is not burned by malicious strong interference signals. The low-noise amplifier enhances the receiving ability of weak long-distance identification signals. The two-stage band-pass filters suppress adjacent-frequency interference signals, and their passbands are respectively: Bluetooth 4.0 radio frequency enhancement module: 2402 MHz to 2480 MHz; Bluetooth 5.0 radio frequency enhancement module: 2404 MHz to 2478 MHz; 2.4G Wi-Fi radio frequency enhancement module: 2400 MHz to 2476 MHz; 5.8G Wi-Fi radio frequency enhancement module: 5725 MHz to 5829 MHz.

Images