Meteorological fax digital receiving system based on FPGA (Field Programmable Gate Array)

Abstract

The invention provides a meteorological fax digital receiving system based on an FPGA (Field Programmable Gate Array). The meteorological fax digital receiving system comprises a digital down-conversion module, an FSK (Frequency Shift Keying) demodulation module, a meteorological fax signal identification module, a meteorological fax data framing module and a radio frequency interaction module. And the digital down-conversion module is used for extracting and filtering the sampling signal. And the FSK demodulation module is used for carrying out phase and frequency discrimination processing. And the weather fax signal identification module is used for carrying out signal identification according to the format of the signal. And the weather facsimile data framing module is used for framing the identified demodulation signals and sending the signals to the interior of the upper computer. And the radio frequency interaction module is used for carrying out radio frequency interaction with an upper computer, transmitting a radio frequency control command and carrying out radio frequency state feedback. According to the meteorological fax digital receiving system based on the FPGA, the defects of nonlinearity, low precision, poor anti-interference capability and the like of analog demodulation can be overcome, and the processing convenience of meteorological fax information is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an FPGA-based meteorological facsimile digital receiving system. Background technique [0002] Wireless meteorological facsimiles use short-wave broadcasting to send facsimile maps, which can not only provide real-time analysis reports on various meteorological and hydrological conditions on the ground, high altitude, and ocean, but also provide short- and medium-term reports on various air pressure situations, air pressure elements, sea surface conditions, and other physical quantities. Forecast maps can improve the timeliness and service quality of weather forecasts. The hardware circuit of the traditional meteorological fax machine is too complicated and huge, the digital integration is low, and the system performance is not superior. When performing signal processing, there are generally shortcomings such as low precision and poor anti-interference ability, ...

AI Technical Summary

Problems solved by technology

The hardware circuit of the traditional meteorological fax machine is too complicated and huge, the digital integration is low, and the system performance is not superior. When performing signal processing, there are generally shortcomings such as low precision and poor anti-interference ability, which will reduce the recognition rate of fax signals. Thereby increasing the difficulty of subsequent signal processing

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