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Method for self-testing of radio frequency receive chains for motor vehicles

A radio frequency receiving, motor vehicle technology, applied in the field of radio frequency receivers, which can solve the problems of unverified radio performance, unverified antenna connection, self-test not controlled by tuner/demodulator, etc.

Active Publication Date: 2022-05-31
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the correct connection of the antenna was not verified and the radio performance of the entire chain was not verified
[0014] Documents CA 2204679 and WO 200889574 disclose a method for self-testing by devices comprising radio frequency transmitters, but these self-tests are not controlled by the tuner / demodulator

Method used

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  • Method for self-testing of radio frequency receive chains for motor vehicles
  • Method for self-testing of radio frequency receive chains for motor vehicles
  • Method for self-testing of radio frequency receive chains for motor vehicles

Examples

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Embodiment Construction

[0037] The present invention will be described below in the non-limiting context of a radio receive chain of a car radio of a motor vehicle

[0038] FIG. 1 shows a car radio 1 provided at the dashboard of a motor vehicle. Car radio 1 including man-machine interface

[0039] The buttons 12 are arranged to be easily actuated by the driver by hand, and the screen 11 is used to display eg available channels,

[0040] Therefore, the latest car radios are provided with three radio reception chains, namely three radio tuners: AM / FM

[0042] The receive amplifier is located closest to the receive antenna in order to improve the signal-to-noise ratio (S / N) as early as possible. according to

[0043] When the system comprising the receiving chain is installed in the vehicle, ie at the assembly plant of the vehicle, the

[0046] However, the correct connection of the antennas was not verified, and the RF performance of the entire RF receive chain was not verified. However, Xu

[0050]- etc...

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Abstract

The invention discloses a method for self-testing of a radio frequency receiving chain of a motor vehicle. The radio frequency receiving chain includes a receiving antenna (21), followed by a receiving amplifier (22), and is connected to the receiving amplifier demodulator. The method includes activating (102) a radio frequency source, which may be a spurious source, under the control of said demodulator to transmit a test radio frequency signal having one or more harmonics of respective substantially known levels, the The harmonics are in the tuner's operating frequency band. The demodulator determines the radio performance of the radio frequency receive chain upstream of the demodulator on the basis of the effect of the radio frequency receive chain on radio reception, harmonics received by the receive antenna and conducted (103) by the receive chain to the demodulator.

Description

Method for self-testing of radio frequency receive chains for motor vehicles technical field [0001] The present invention relates generally to radio frequency receivers on motor vehicles, and more particularly to radio frequency receivers for motor vehicles. The method of closing the chain self-test. Background technique [0002] Radios for motor vehicles or car radios allow the reception of radio programs via the Hertzian route. broadcaster The company transmits these radio programs in the form of radio frequency (RF) signals. These RF signals are generated in a more or less complex manner by Signal modulation in the "hearing frequency" range, which in acoustics refers to frequencies audible to humans between Signals between 20Hz and 20kHz. [0003] Historically, the first such signal to be broadcast on the radio was an analog signal, especially when modulating the amplitude (AM, stands for "Amplitude Modulation" in English), modulated long wave or GO (150kHz‑300k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/20H04B17/29H04B17/00
CPCH04B17/20H04B17/29H04B17/0085H04B17/15
Inventor 雷诺德·孔特大卫·戈兰
Owner PEZHO SITROEN AUTOMOBILS SA