A RF device of single-side belt digital short wave receiver for sensor network gateway

Abstract

The invention relates to a radio frequency device laterally provided with a digital short wave receiver, and the radio frequency device can be used for a gateway of a sensor network. With working frequency range of 5MHz to 25MHz, the radio frequency device comprises a receiving aerial, a slicer circuit, a broadband frequency selection circuit, a receiving circuit and a local oscillation circuit, etc. The receiving circuit comprises a low noise amplifier, a first active frequency mixer, a surface acoustic wave filter, a second active frequency mixer, a crystal filter, a radio frequency amplifier, a third active frequency mixer, an active band-pass filter and an AGC circuit, etc. The three-time frequency conversion superheterodyne structure design is adopted, and a first intermediate frequency is 240MHz to 250MHz, a second intermediate frequency is 35MHz to 45MHz, and a third intermediate frequency is 10MHz to 20MHz. The radio frequency device is a novel radio frequency device for a blind sending and blind receiving unidirectional oversea communication gateway, the volume of the radio frequency is less than that of a half of a cell phone; the radio frequency device is applicable to digital short wave remote communication adopting modulation methods of 4FTSK, BPSK and QPSK, and can receive the message in a multi-frequency point and multi-mode frequency sweeping way within the scheduled time, thus realizing the function of multi-frequency point repeating burst communication.

Description

technical field [0001] The invention relates to a single-sideband digital (4FTSK, BPSK, QPSK modulation) short-wave burst communication receiver radio frequency device that can be used for a sensor network gateway. Background technique [0002] The SSB digital short-wave burst communication receiver based on 4FTSK, BPSK, and QPSK is a brand-new blind-sending and blind-receiving one-way cross-sea communication gateway developed according to user requirements according to the special needs of remote communication and control of wireless sensor networks. Receive information in the way of multi-frequency point and multi-mode frequency scanning within the agreed time period, and realize the function of multi-frequency point repeated burst communication. Due to the adoption of 4FTSK technology, it has better anti-fading and anti-frequency offset performance. At the same time, due to the use of PSK technology, it has a high data transmission rate under good channel conditions. Th...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a single-sideband digital short-wave receiver radio frequency device that can be used for sensor network gateways, solve the miniaturization, low power consumption, high sensitivity, and high linearity problems of digital short-wave remote reception, and meet the requirements of 4FTSK, BPSK, QPSK modulation communication, realize the function of multi-frequency point multi-mode repeated burst communication within the agreed time period

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