A dvb carrier receiving system

Abstract

The invention discloses a DVB (Digital Video Broadcasting) carrier wave receiving system and belongs to the technical field of electronics. The system is provided with a signal receiving module, a tuning and demodulation module, a CPU (Central Processing Unit) micro-processing module and a control module, wherein the signal receiving module is used for receiving a television broadcast signal of a KU waveband emitted by a satellite and converting the television broadcast signal into an L-waveband radio frequency signal to be input to the tuning and demodulation module; the tuning and demodulation module is a DVB carrier wave receiver and is used for carrying out low-noise amplification, orthogonal down-conversion processing and automatic gain control on the L-waveband radio frequency signal to output an AGC (Automatic Gain Control) value to the control module; the CPU micro-processing module is used for carrying out parameter configuration on the tuning and demodulation module, wherein configured parameters comprise a frequency fixing position, a carrier wave speed and a frequency deviation; the control module is used for adjusting an angle of a satellite antenna to be close to an ideal angle until the maximum AGC value is obtained. The DVB carrier wave receiving system is used for carrying out satellite alignment on the satellite by the antenna.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a vehicle-mounted or portable antenna application system in the field of satellite communication. Background technique [0002] In the field of satellite communication, the current satellite antenna products, as the key equipment for star-seeking, are mainly high-frequency power signal detection equipment (beacon machine) or new DVB carrier receiver. Most satellite antennas use beacon receiver technology, but there are certain technical defects in the use of this beacon receiver. The beacon machine is a device that demodulates the narrowband signal of the satellite beacon. The demodulation range is 50-150KHz narrowband signal. Since the horizontal and vertical beacon frequencies of some satellites are the same or very close to each other, it is easy to It is easy to cause the antenna to make mistakes when performing satellite locking. Contents of the invention [0003] In...

AI Technical Summary

Problems solved by technology

The beacon machine is a device that demodulates the narrowband signal of the satellite beacon. The demodulation range is 50-150KHz narrowband signal. Since the horizontal and vertical beacon frequencies of some satellites are the same or very close to each other, it is easy to It is easy to cause an error when the antenna is locked on the satellite

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