Low-interference high-efficiency airborne screen projection system
By embedding UWB tag modules and onboard APs in the armrests of aircraft seats, the problems of cumbersome pairing, signal interference, and privacy leaks in onboard wireless screen projection systems are solved, achieving a low-latency, efficient, and secure screen projection experience and low-cost hardware modification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING AVIACOMM SEMICON CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-05-05
AI Technical Summary
In an in-flight Wi-Fi environment, existing wireless screen projection systems suffer from problems such as cumbersome pairing, severe signal interference, and privacy leaks, resulting in a poor entertainment experience for passengers and high hardware costs.
It adopts a UWB tag module and an airborne AP. The UWB tag module includes a UWB radio frequency module, a signal control module, a power supply module and an antenna module, which are embedded in the seat armrest to achieve seamless pairing and efficient signal transmission. Combined with the SPI interface of the UWB gateway and the airborne AP, it realizes a fast and encrypted screen projection process.
It enables automatic pairing of passenger devices upon touch, with a screen projection latency of less than 1 second, minimal signal interference, privacy and security, and a hardware cost of less than $10 per seat.
Smart Images
Figure CN224205154U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of airborne entertainment technology, specifically relating to a low-interference, high-efficiency airborne projection system. Background Technology
[0002] As the requirements for in-flight entertainment systems become increasingly demanding, wireless screen mirroring, while a common form of entertainment, still faces several challenges in in-flight Wi-Fi environments: Cumbersome pairing: Passengers must manually select a Wi-Fi SSID, enter a password, and even undergo secondary authentication, resulting in a poor experience; Signal interference: The metallic cabin environment causes multipath reflections in Wi-Fi, leading to high latency (>200ms) and frequent stuttering; Privacy leaks: Traditional screen mirroring can be eavesdropped on by neighboring devices (e.g., Miracast lacks mandatory encryption). Market demand: Airlines need to improve the passenger entertainment experience (e.g., by highlighting "one-click screen mirroring"); hardware costs must be controllable (modification cost per seat < $10). Utility Model Content
[0003] To achieve the above objectives, the technical solution of this utility model is as follows: A low-interference, high-efficiency airborne projection system, comprising a UWB tag module and an airborne AP, wherein the UWB tag module includes:
[0004] The UWB RF module, signal control module, power supply module, and antenna module are embedded in the cabin armrest, with the entire label embedded in the armrest and the PCB antenna facing outwards.
[0005] The UWB RF module is used to modulate the baseband signal to be transmitted. Internally, it is a DW3000 transceiver, which includes working voltage input, SPI signal input and RF output. The working voltage part is connected to the power supply module, the SPI signal input part is connected to the signal control module, and the RF output part is connected to the antenna module. All connections of the UWB RF module are completed by PCB traces.
[0006] The signal control module is used to transmit baseband signals to the UBW RF module. Internally, it contains SMT32 and TXS108EPWP signal conversion modules, including an SMT32 working voltage input module, a signal amplitude conversion signal input module, and an SPI signal interaction module. The connection of the signal control module is completed by PCB routing.
[0007] The power module provides operating voltage to the UWB RF module and signal control module. It includes a TPS7A4700RGWT and an LDO circuit. The TPS7A4700RGWT is supplied with voltage from the USB serial port on the seat. The output voltage is divided into three paths: one to the UWB RF module, the second to the signal control module, and the third to the LDO to be converted to 1V8, which then flows to the signal control module and the SMT32 as operating voltage.
[0008] The antenna module contains a planar inverted F antenna, which is connected to the UWB radio frequency module.
[0009] The airborne AP includes a UWB gateway, which includes a UWB integrated module and a power module. The UWB integrated module and the power module are connected on the same PCB through traces.
[0010] The UWB integrated module is connected to the SPI interface of the onboard AP module.
[0011] Preferably, the SPI signal interaction module comprises two parts: interaction from SMT32 to TXS108EPWP, voltage conversion by TXS108EPWP, and then interaction from TXS108EPWP to the RF module.
[0012] Preferably, the low-interference, high-efficiency airborne projection system is characterized in that the operating voltage and signal amplitude conversion voltage are supplied by the SMT32 power module at 1V8, and the TXS108EPWP requires a power supply of 1V8 and 3V3.
[0013] Preferably, the UWB radio frequency module, signal control module, power supply module, and antenna module are presented as a label on a bare PCB board, with a size smaller than the width of the handrail, and are fixed below the handrail. Only the antenna needs to be exposed, and the antenna's transmission direction is perpendicular to the handrail and upward.
[0014] Preferably, the UWB integrated module and power module are PCB boards attached to the AP module, and their size and dimensions do not affect the embedded installation of the current AP.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a low-interference and high-efficiency airborne projection system, including a UWB tag module and an airborne AP. For the first time, UWB centimeter-level positioning is bound to the cabin seat to achieve seamless pairing. The UWB tag is embedded in the seat armrest, and the pairing process is automatically triggered when the passenger touches the device. Attached Figure Description
[0016] Figure 1 This is a hardware distribution diagram of the airborne system described in this utility model;
[0017] Figure 2 This is a schematic diagram of the UWB configuration scheme of the airborne system described in this utility model;
[0018] Figure 3 This is a block diagram of the UWB tag connection of the airborne system described in this utility model.
[0019] List of identifiers in the attached diagram: 1-UWB RF module, 2-Signal control module, 3-Power supply module, 4-Antenna module. Detailed Implementation
[0020] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0021] Example: Figure 1 As shown, an airborne projection system comprises the following hardware components:
[0022] The seat-integrated UWB tag is used to receive near-field trigger signals from passenger devices and broadcast seat identification via the onboard AP. It completes device authentication based on the UWB signal and allocates dedicated Wi-Fi resources to passenger devices.
[0023] UWB tags are embedded in the seat armrests, automatically triggering the pairing process when touched by the passenger's device. Video stream transmission uses dynamic beamforming, limiting signal coverage to within 1 meter of the target seat. The UWB module uses IR-UWB pulse radio with a pulse width ≤2ns. UWB tag model: Qorvo DW3000 (compliant with IEEE 802.15.4z standard);
[0024] Installation location: inside the armrest: ≤5mm from the surface to ensure touch sensitivity; Power supply: powered by the seat's USB interface (5V / 100mA); Communication parameters: frequency band: 6.5GHz~8.5GHz; ranging accuracy: ±10cm; transmission power: -41.3dBm / MHz (FCC compliant).
[0025] UWB Tag Hardware Connection Description: Includes a tag-shaped UWB signal transmitter. The hardware consists of a UWB RF module 1, a signal control module 2, a power supply module 3, and an antenna module 4. The entire board is embedded in the cabin armrest, with the tag itself embedded in the armrest, and the PCB antenna facing outwards.
[0026] UWB RF module 1 is used to modulate the baseband signal to be transmitted. Internally, it uses a DW3000 transceiver, and its design includes an operating voltage input, an SPI signal input, and an RF output. The operating voltage section is connected to the power supply module, the SPI signal input section is connected to the signal control module, and the RF output section is connected to the antenna module. All connections of UWB RF module 1 are completed using PCB traces.
[0027] Signal control module 2 transmits baseband signals to the UBW RF module. Internally, it includes SMT32 and TXS108EPWP signal conversion modules. Its design comprises an SMT32 operating voltage input module, a signal amplitude conversion input module, and an SPI signal interaction module. The operating voltage and signal amplitude conversion voltage are supplied by the SMT32 power module (1V8), while the TXS108EPWP requires 1V8 and 3V3 power respectively. The SPI signal interaction module consists of two parts: communication from the SMT32 to the TXS108EPWP, voltage conversion by the TXS108EPWP, and then communication from the TXS108EPWP to the RF module. All connections of signal control module 2 are implemented using PCB traces.
[0028] The power module provides operating voltage to the RF module and signal control module. Internally, it includes a TPS7A4700RGWT and an LDO circuit. The TPS7A4700RGWT receives 5V from the USB serial port on the back of the seat, and its 3V3 output is split into three paths. One path goes to an RF module such as UWB RF module 1; the second path goes to a signal conversion module such as signal control module 2; and the third path goes to the LDO to convert the voltage to 1V8, which then flows to the signal conversion module such as signal control module 2 and the SMT32 as operating voltage.
[0029] Antenna module 4 receives information from the radio frequency module and sends services to the user's mobile phone. Internally, it is a planar inverted F antenna, designed with an L-shaped main patch plus two parasitic patches (to extend bandwidth), and is connected to the radio frequency module.
[0030] The UWB RF module 1, signal control module 2, power supply module 3, and antenna module 4 are presented as a bare PCB board with a label. The size of the label is smaller than the width of the handrail and it is fixed below the handrail. Only the antenna needs to be exposed, and the antenna's transmission direction is perpendicular to the handrail and upward.
[0031] This system also includes an airborne AP (including a UWB gateway).
[0032] Airborne AP installation location: Same as traditional APs, such as cabin storage compartments; Core chips: Wi-Fi: Qualcomm Networking Pro 1200 (supports dual-band Wi-Fi 6); UWB: Decawave DWM3000 (integrates UWB baseband and RF front end).
[0033] Interface definition: UWB backhaul channel: communicates with the host controller via SPI interface, with a speed of 20Mbps;
[0034] UWB Gateway: Includes an integrated UWB module. The overall hardware includes the UWB integrated module and a power module; the UWB integrated module has the same actual structure as the UWB tag, and also includes complete RF transceiver functions and an antenna, and its interfaces include a power interface and an SPI interface.
[0035] The UWB integrated module and the power module are connected via traces on the same PCB; the UWB integrated module is connected to the SPI interface of the existing airborne AP module and follows the network management configuration conditions; the power module and the UWB tag have the same working status configuration; the UWB integrated module and the power module are structurally PCB boards attached to the AP module, and their size does not affect the embedded installation of the current AP; passenger equipment requirements: UWB hardware and protocol support.
[0036] The airborne projection system in this embodiment:
[0037] UWB near-field pairing: Achieve "one-touch connection" through UWB tags embedded in the seat, with pairing time of less than 1 second;
[0038] Dual-channel transmission:
[0039] UWB channel: transmits encrypted control commands (play / pause), latency <10ms;
[0040] Wi-Fi Channel: Beamforming directional transmission of video stream (H.265 encoding), with dynamic bandwidth allocation (20-80MHz);
[0041] Anti-interference design:
[0042] UWB uses pulse radio (IR-UWB) with a multipath bit error rate of <10⁻ 6 .
[0043] UBW Quick Screen Casting Process:
[0044] Step 1: Touch Pairing: (UWB Tag Initialization → UWB Tag Broadcast → Mobile Phone)
[0045] Step 2: Send encrypted authentication message from mobile phone (mobile phone → UWB gateway)
[0046] Step 3 Gateway Resolution and Upload (UWB Gateway → Main AP)
[0047] Step 4 Dual-channel initialization (AP processing → AP transmission → mobile phone → AP)
[0048] Step 5: Screen projection data transmission (phone → AP → seat screen).
[0049] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.
Claims
1. A low-interference, high-efficiency airborne projection system, characterized in that, Includes UWB tag modules and airborne APs. The UWB tag module includes: The UWB radio frequency module (1), signal control module (2), power supply module (3), and antenna module (4) are embedded in the cabin armrest. The entire label is embedded in the armrest, and the PCB antenna faces outward. The UWB RF module (1) is used to modulate the baseband signal to be transmitted. Its internal part is a DW3000 transceiver, including working voltage input, SPI signal input and RF output. The working voltage part is connected to the power supply module, the SPI signal input part is connected to the signal control module, and the RF output part is connected to the antenna module. The connection of the UWB RF module (1) is completed by PCB routing. The signal control module (2) is used to transmit the baseband signal to the UBW RF module (1). Its internal components are SMT32 and TXS108EPWP signal conversion modules, including the SMT32 working voltage input module, the signal amplitude conversion signal input module and the SPI signal interaction module. The connection of the signal control module (2) is completed by PCB routing. The power module (3) is used to provide working voltage to the UWB RF module (1) and the signal control module (2). It includes TPS7A4700RGWT and LDO circuit. The TPS7A4700RGWT is supplied with voltage by the USB serial port on the seat. The output voltage is divided into three paths: one path to the UWB RF module (1), the second path to the signal control module (2), and the third path to the LDO circuit to be converted to 1V8, and then flow to the signal control module (2) and SMT32 as working voltage respectively. The antenna module (4) has a planar inverted F antenna inside, which is connected to the UWB radio frequency module (1); The airborne AP includes a UWB gateway, which includes a UWB integrated module and a power module. The UWB integrated module and the power module are connected on the same PCB through traces. The UWB integrated module is connected to the SPI interface of the onboard AP module.
2. The low-interference, high-efficiency airborne projection system according to claim 1, characterized in that, The SPI signal interaction module consists of two parts: the SMT32 interacts with the TXS108EPWP, the TXS108EPWP performs voltage conversion, and then the TXS108EPWP interacts with the RF module.
3. The low-interference, high-efficiency airborne projection system according to claim 1, characterized in that, The low-interference, high-efficiency airborne projection system is characterized in that the operating voltage and signal amplitude conversion voltage are supplied by the SMT32 power module at 1V8, and the TXS108EPWP requires a power supply of 1V8 and 3V3.
4. The low-interference, high-efficiency airborne projection system according to claim 1, characterized in that, The UWB radio frequency module (1), signal control module (2), power supply module (3) and antenna module (4) are presented as a label style of bare PCB board. The size is smaller than the width of the handrail and is fixed below the handrail. Only the antenna needs to be exposed. The antenna transmission direction is perpendicular to the handrail and upward.
5. The low-interference, high-efficiency airborne projection system according to claim 1, characterized in that, The UWB integrated module and power module are PCB boards attached to the AP module, and their size and dimensions do not affect the embedded installation of the current AP.