Method and device for wirelessly reading a meter

Abstract

The invention relates to a method and a device for wirelessly reading a meter, in particular to a centralized type method and a device for unidirectionally and wirelessly reading a meter. The device comprises N slave stations, P main stations, K simulation front terminals and a management center; and each slave station consists of a remote transmission meter and a radio transmitter. The method comprises the following steps: performing direct sequence spread spectrum of data collected by the N slave stations according to preset pseudo-random codes; transmitting signals after spread spectrum anddigital modulation on M carrier frequencies; for the main stations, performing down conversion and digitalization of the received signals on the K carrier frequencies; and performing matching despread-spectrum of the digitalized signals one after another by using L pseudo-random codes adopted by the spread spectrum of the slave stations to demodulate out data sent by the slave stations. In the invention, spread spectrum is applied to the signal transmission of wireless meter reading, so that the signal to noise ratio is greatly improved, and better penetrability and transmission distance under slim transmission power can be obtained; the main stations can manage more than thousands of slave stations; the unidirectional communication greatly reduces the cost and power consumption of slavestation equipment of the wireless meter reading system; and with the invention, the centralized reading can be rapidly popularized and applied.

Description

technical field [0001] The invention relates to a wireless meter reading method and equipment, in particular to a centralized one-way wireless meter reading method and equipment. Background technique [0002] With the development of human living and urbanization, the supply of water, electricity, gas and other basic daily necessities that people need has been piped and wired. Meters are installed indoors or outdoors. For the meter installed indoors, manual meter reading is often difficult to read within the specified time because the residents are not at home. There are also problems in terms of safety and security. For this reason, an automatic meter reading system is produced, which is mainly divided into wired data transmission networking and wireless data transmission networking. [0003] Wired data transmission network mode uses several levels of wired ad-hoc network composed of RS485 or M-BUS bus as the internal network, and uses the public telephone network (PSTN) or...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the signals of the slave stations in the existing wireless one-way meter reading system are easy to collide at the master station, are easily subject to external interference, and have poor signal penetration, and provide a low-cost, high anti-noise, anti-interference , anti-fading, anti-multipath effect wireless meter reading method and device

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