Portable terminal radio frequency channel based on frequency coordination

Abstract

The invention relates to the field of satellite terminal radio frequency, in particular to a portable terminal radio frequency channel based on frequency coordination. The channel comprises a transmitting channel, a receiving channel and a dual-rotation circularly polarized antenna, and is characterized in that the transmitting channel performs digital-to-analog processing on data received from a baseband and performs up-conversion amplification to form a radio frequency signal transmitted by the antenna, the receiving channel converts a received radio frequency signal into a low frequency signal, the low frequency signal is sent to the baseband after analog-to-digital conversion, the dual-rotation circularly polarized antenna is used for transmitting and receiving the radio frequency signal, a narrowband signal and a broadband signal in a downlink signal are received by the same rotation direction antenna, and a narrow-band signal and a broadband signal in the uplink signal are transmitted by the left-handed circularly polarized antenna and the right-handed circularly polarized antenna respectively; and both the transmitting channel and the receiving channel adopt zero intermediate frequency sampling structures. Based on the requirements of frequency coordination on the rotation directions of antennas of different frequency bands, narrowband signals and broadband signals are received, combined and transmitted, and a zero intermediate frequency structure is adopted to reduce the power consumption of a radio frequency channel and reduce the volume and the weight.

Description

technical field [0001] The invention relates to the field of satellite terminal radio frequency, in particular to a frequency coordination-based portable terminal radio frequency channel. Background technique [0002] With the rapid development of the global communication industry and various radio services, frequency sharing problems and radio interference problems in border areas between China and neighboring countries and regions are increasing day by day. Among them, the cross-border coverage of the public mobile phone network, the interference of aviation navigation communication frequencies, the coordination of ground services and satellite services, and the coordination of radio and television frequencies are more prominent. In order to ensure the effective use of radio frequencies, improve frequency utilization, ensure the safety of aerospace navigation and communication, promote the development of communication services and the coverage of radio and television netwo...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the radio frequency channel structure is an intermediate frequency band-pass sampling structure, which requires more filter devices, more cables and interfaces, and a larger volume, which is not conducive to the miniaturization requirements of the satellite communication system

In addition, under frequency coordination, broadband signals and narrowband signals exist at the same time. The existing RF channel design does not take into account the fact that broadband signals and narrowband signals have different requirements for antenna rotation.

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