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CN-122000666-A - GNSS and satellite short message two-in-one vehicle-mounted antenna

CN122000666ACN 122000666 ACN122000666 ACN 122000666ACN-122000666-A

Abstract

The antenna module comprises a PCB, an antenna arranged above the PCB, a shielding cover arranged below the PCB, a first antenna working in a 1.2GHz frequency band, a second antenna working in a 1.6GHz frequency band and a third antenna working in a 2.4GHz frequency band, wherein three radio frequency links, namely a GNSS receiving link, a satellite short message receiving link and a satellite short message transmitting link, are arranged on the PCB, and are respectively connected with the three groups of antennas. The invention realizes the two-in-one vehicle-mounted antenna of GNSS and satellite short message, saves cost, facilitates the arrangement of the whole vehicle-mounted antenna system, and has the characteristics of economy, convenience, beautiful appearance and strong received signal.

Inventors

  • WU KEDONG
  • Xin Shaonan
  • YU JUNJIE
  • LU YUNFENG
  • LIU CONGBO

Assignees

  • 江苏骅盛车用电子股份有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (7)

  1. 1. The GNSS and satellite short message two-in-one vehicle-mounted antenna comprises a shell consisting of an upper shell (1) and a lower shell (2), and is characterized by further comprising an antenna module (3) arranged in the shell; The antenna module (3) comprises a PCB (31), an antenna (32) arranged above the PCB (31) and a shielding cover (33) arranged below the PCB (31), wherein the antenna (32) comprises a first antenna (321) working at a 1.2GHz frequency band, a second antenna (322) working at a 1.6GHz frequency band and a third antenna (323) working at a 2.4GHz frequency band, the three groups of antennas (32) are made of PPO materials, the first antenna (321) is used for receiving two paths of GNSS signals with a 90-degree phase difference, the second antenna (322) is used for receiving 1.6GHz signals in the GNSS and uplink signals of Beidou short messages, and the third antenna (323) is used for receiving downlink signals of one path of Beidou short messages; t-shaped patches are loaded on the periphery of the antenna (32), and are used for widening the beam width of the antenna and improving the signal coverage range in a vehicle-mounted scene; Three radio frequency links are arranged on the PCB (31) and are respectively a GNSS receiving link, a satellite short message receiving link and a satellite short message transmitting link, and the three radio frequency links are respectively connected with three groups of antennas (32); and the PCB (31) is also connected with a Fakra connector (34).
  2. 2. The GNSS and satellite short message two-in-one vehicle-mounted antenna of claim 1, wherein the GNSS receiving link comprises a dual-band pre-filter, a first-stage amplifier and a second-stage amplifier which are sequentially connected, the noise coefficient of the GNSS receiving link is 0.7-1.1dB, and the total gain is not lower than 38dB.
  3. 3. The GNSS and satellite short message two-in-one vehicle antenna of claim 2, wherein the satellite short message receiving link comprises a first filter, a third-stage amplifier, a second filter and a fourth-stage amplifier which are sequentially connected, the noise coefficient of the satellite short message receiving link is not higher than 0.8dB, and the total gain is not lower than 36dB.
  4. 4. The GNSS and satellite short message two-in-one vehicle-mounted antenna of claim 1, wherein the satellite short message transmitting link comprises a third filter, a fifth-stage amplifier and a sixth-stage amplifier which are sequentially connected, and the maximum output power of the satellite short message transmitting link is not lower than 36.5dBm and the total gain is not lower than 52dB.
  5. 5. The two-in-one vehicle-mounted GNSS and satellite short message antenna of claim 1, wherein the first antenna (321) and the second antenna (322) are of a single-layer double-frequency structure, the single-layer double-frequency structure comprises an outer square patch and an intermediate patch, the outer square patch is used for processing low-frequency signals, and the intermediate patch is used for processing high-frequency signals.
  6. 6. The two-in-one vehicle-mounted GNSS and satellite short message antenna of claim 1, wherein the third antenna (323) is of a stacked structure design, and the stacked structure is formed by loading a single-feed right-handed circularly polarized antenna above the first antenna and is used for realizing high-frequency signal transmission of the satellite short message.
  7. 7. The GNSS and satellite short message two-in-one vehicle-mounted antenna according to claim 1 is characterized in that a metal column is arranged in the antenna module (3) and used for isolating feed points of different frequency bands in the three antenna assembly so as to avoid signal interference among the frequency bands.

Description

GNSS and satellite short message two-in-one vehicle-mounted antenna Technical Field The invention belongs to the technical field of antennas, and particularly relates to a GNSS and satellite short message two-in-one vehicle-mounted antenna. Background In the vehicle-mounted field, the high-precision positioning function of a Global Navigation Satellite System (GNSS) and the network-free communication function of satellite short messages (such as Beidou No. three short messages) support the core requirements of scenes such as intelligent network-connected automobiles, commercial vehicle monitoring, emergency rescue vehicles and the like. The former provides real-time position information to ensure navigation and fleet management, while the latter realizes bidirectional data transmission in a remote or emergency scene without a ground mobile communication network (4G/5G), which are indispensable. At present, the implementation scheme of the GNSS and satellite short message functions in the vehicle-mounted scene has obvious defects, and the practical application requirements are difficult to meet: Firstly, the separated scheme needs to realize positioning and communication respectively through two independent hardware modules (comprising an antenna, a radio frequency link and a control unit), so that not only too much vehicle-mounted space is occupied and the installation and wiring cost is increased, but also GNSS positioning drifting and short message communication packet loss are easily caused by signal mutual interference generated due to frequency band proximity, and the two independent hardware modules cannot realize real-time data fusion, and the system delay is increased. Secondly, the early integration scheme attempts to integrate functions, but still does not break through the key bottleneck that the module volume is more than 68mm multiplied by 10.1mm, the module cannot be adapted to compact installation spaces such as a center console and a front instrument panel, the performance difference of the center console and the front instrument panel is not considered in the design of a radio frequency link, the imbalance problem that GNSS noise coefficient is too high (> 1.2 dB) or short message receiving sensitivity is insufficient (> 125 dBm) often occurs, and the module only supports a single GNSS system and a fixed frequency band, has poor compatibility, and cannot be adapted to the requirements of a plurality of systems and Beidou No. three new frequency bands. In addition, the existing scheme is generally difficult to meet the environmental adaptability requirement of the vehicle gauge, performance attenuation is easy to occur at the extreme temperature of-40 ℃ to 85 ℃ and the vibration of 10Hz to 2000Hz (ISO 16750 standard), and long-term reliable operation cannot be guaranteed. Disclosure of Invention In order to solve the technical problems, the invention adopts a technical scheme that: the GNSS and satellite short message two-in-one vehicle-mounted antenna comprises a shell consisting of an upper shell and a lower shell, and is characterized by further comprising an antenna module arranged in the shell; The antenna module comprises a PCB, an antenna arranged above the PCB and a shielding cover arranged below the PCB, wherein the antenna comprises a first antenna working in a 1.2GHz frequency band, a second antenna working in a 1.6GHz frequency band and a third antenna working in a 2.4GHz frequency band, the three groups of antennas are made of PPO materials, the first antenna is used for receiving two paths of GNSS signals with 90-degree phase difference, the second antenna is used for receiving 1.6GHz signals in GNSS and uplink signals of Beidou short messages, and the third antenna is used for receiving downlink signals of one path of Beidou short messages; The T-shaped patches are used for widening the beam width of the antenna and improving the signal coverage under a vehicle-mounted scene; Three radio frequency links are arranged on the PCB and are respectively a GNSS receiving link, a satellite short message receiving link and a satellite short message transmitting link, and the three radio frequency links are respectively connected with three groups of antennas; and the PCB is also connected with a Fakra connector. Further, the GNSS receiving link comprises a dual-band pre-filter, a first-stage amplifier and a second-stage amplifier which are sequentially connected, the noise coefficient of the GNSS receiving link is 0.7-1.1dB, and the total gain is not lower than 38dB. Further, the satellite short message receiving link comprises a first filter, a third-stage amplifier, a second filter and a fourth-stage amplifier which are sequentially connected, the noise coefficient of the satellite short message receiving link is not higher than 0.8dB, and the total gain is not lower than 36dB. Further, the satellite short message transmitting link comprises a third filter, a fifth-stage amplifier an