Vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure

A technology for suppressing circuit and coexistence interference, applied in vehicle wireless communication services, vehicle communication, radio wave measurement systems, etc. The effect of high precision, good suppression consistency and low cost

Pending Publication Date: 2022-02-15
深圳从平技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the above-mentioned prior art has the following disadvantages and deficiencies: only the SAW scheme is added to the GNSS system, which can only solve the common out-of-band spurious problem; the cellular channel does not consider the second harmonic of B13 / B14 falling to the GNSS center Frequency point, no targeted interference suppression; GNSS channel is to consider the nonlinear harmonic spurious interference generated by B13 / B14 main wave entering Elna

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  • Vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure
  • Vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure
  • Vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure

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Embodiment Construction

[0030] In order to make the object, technical solution and beneficial effect of the present invention clearer, the following two preferred embodiments of the present invention and the accompanying drawings will be described in detail.

[0031] like figure 1 As shown, the cellular radio frequency link transmits to the cellular antenna through the duplexer, LPF, and ASM devices through the PA output. Due to the active devices on the radio frequency circuits such as PA and ASM, nonlinear effects will occur, resulting in some harmonic noise. Scattered interference signals, and these harmonic spurious interference signals such as figure 2 As shown, the cellular low-frequency band such as B13 / B14 has a frequency of 788M, and the second harmonic just falls near 1575.42M of GNSS, and the cellular antenna is coupled to the GNSS antenna through antenna coupling, thus entering the GNSS In the radio frequency link, the GNSS link enters the GNSS receiver through NOTCH2, Pre SAW, Elna, an...

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Abstract

The invention discloses a vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure which mainly exists in a common board of a GNSS system and 4G and 5G modems and mainly comprises cellular 4G and 5G radio frequency paths and a GNSS receiver radio frequency path. The cellular 4G and 5G radio frequency paths mainly comprise a radio frequency low-pass filter LPF and a wave trap circuit NOTCH1; the wave trap circuit NOTCH1 and the radio frequency low-pass filter LPF are separately constructed; the radio frequency low-pass filter LPF is a low-pass filter circuit formed by connecting two inductors in series, and the wave trap circuit NOTCH1 is composed of an inductor and a capacitor; the GNSS receiver radio frequency path mainly comprises a wave trap circuit NOTCH2, a high-pass filter HPF and a GNSS receiver; the high-pass filter HPF is mainly formed by connecting two capacitors in series; and the wave trap circuit NOTCH2 is composed of an inductor and a capacitor. According to the invention, the high-suppression LPF + NOTCH circuit is additionally arranged on the cellular radio frequency path, so that the harmonic spurious interference is reduced, and meanwhile, the NOTCH + HPF circuit is additionally arranged on the GNSS radio frequency path, so that the dominant wave signal strength is reduced.

Description

technical field [0001] The invention relates to wireless communication electronic products, in particular to a vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure such as vehicle-mounted wireless communication, vehicle-mounted tablet, vehicle-mounted navigation, and vehicle-mounted high-precision positioning. Background technique [0002] From wearable devices, smart home devices to automotive automatic driving, automotive navigation, automotive high-precision positioning, automotive T-BOX, automotive multimedia panels, personnel and asset tracking and other electronic wireless communication equipment, global navigation satellite system (GNSS) technology is being realized Accurate positioning plays an increasingly important role. [0003] Usually, GNSS receivers work in conjunction with cellular 4G and 5G communication modems, and 4G and 5G modems wirelessly transmit the location data obtained by GNSS receivers to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/08H04B1/10H04B1/16H04B1/401H04W4/48G01S19/21G01S19/37
CPCH04B1/082H04B1/1027H04B1/16H04B1/401H04W4/48G01S19/21G01S19/37H04B2001/1063
Inventor 魏红剑
Owner 深圳从平技术有限公司
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