Power adjustment method, device and system for electronic identification read-write equipment of motor vehicle

Abstract

The invention provides a power adjustment method, device and system for electronic identification read-write equipment of a motor vehicle, and the method comprises the steps: receiving a radio frequency signal of the electronic identification of the motor vehicle; Processing the radio frequency signal to obtain a digital baseband signal; Determining a control parameter for performing power adjustment on the radio frequency signal according to the digital baseband signal; And the power of the radio frequency signal is adjusted through the control parameter, so that the problem that the readingsuccess rate is reduced due to a certain distance of reading blind area of the electronic identification reading and writing equipment of the motor vehicle in the related technology can be solved, andthe dynamic range of a receiving link can be greatly improved under the condition that the receiving sensitivity is not influenced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a power adjustment method, device and system for a motor vehicle electronic identification reading and writing device. Background technique [0002] In the communication process of high-performance motor vehicle electronic identification reading and writing equipment, in order to ensure the effective reading of weak signals, the sensitivity of the reading and writing equipment to receive signals is relatively high. When the received signal is relatively weak, in order to improve the receiving sensitivity of the read-write device, the front stage of the demodulator of the radio frequency receiving link of the read-write device usually needs to perform power amplification processing. In addition, the original baseband signal of the post-demodulator stage also needs to be compared. Large multiples of signal amplification. However, when the strength of the received radio frequency ...

AI Technical Summary

Problems solved by technology

However, the current solution has the problem of low control accuracy, which easily affects the signal quality of useful signals.

For example, when there is a large interference signal entering the receiving chain, in order to ensure the dynamic range, the AGC needs to attenuate the receiving gain. At this time, the useful signal in the front stage of the demodulator is also attenuated, resulting in a weak baseband signal amplitude. In addition, when When the read-write device is under the condition of less interference, the baseband signal is prone to signal saturation, which will also affect the accurate reading of the electronic identification of the motor vehicle by the read-write device

Therefore, this method cannot ensure that the received signals of each node such as radio frequency signals, analog baseband signals, and digital baseband signals are adjusted to an appropriate level.

In the actual application process, it will lead to a certain distance of reading blind area in the electronic identification reading and writing equipment of motor vehicles, and the success rate of reading will be reduced.

[0004] Aiming at the problem that the electronic identification reading and writing equipment of motor vehicles has a reading blind area at a certain distance in the related technology, and the success rate of reading is reduced, no solution has been proposed

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