Satellite signal receiving device and Doppler frequency offset processing method

Abstract

The embodiment of the invention discloses a satellite signal receiving device and a Doppler frequency offset processing method. The satellite signal receiving device comprises a Doppler frequency offset determination module and a basic receiving module, the basic receiving module comprises at least two stages of frequency conversion processing units, and the Doppler frequency offset determining module is connected with a target frequency conversion processing unit with a set stage in the basic receiving module. The Doppler frequency offset determination module is used for determining the Doppler frequency offset according to the collected satellite operation information and the equipment operation information and sending the Doppler frequency offset to the target frequency conversion processing unit, and the basic receiving module is used for carrying out multi-stage down-conversion processing on the received satellite signals and carrying out Doppler frequency offset compensation matched with Doppler frequency offset to obtain the data baseband signals. According to the technical scheme, the Doppler frequency offset is determined according to the satellite and equipment operationinformation, the calculation is simple, the Doppler frequency offset is compensated at the target frequency conversion processing unit, and the system design is simplified.

Description

technical field [0001] The embodiment of the present invention relates to satellite communication technology, in particular to a satellite signal receiving device and a Doppler frequency offset processing method. Background technique [0002] At present, satellite communication technology continues to develop, and the estimation and compensation of Doppler frequency offset is a very important link in the realization of satellite communication system. [0003] In the ground mobile communication system, the baseband signal processing unit of the terminal is mainly used to estimate and compensate the Doppler frequency offset. However, due to the excessive Doppler frequency offset of satellite communication, the baseband signal processing unit cannot correctly estimate the Doppler frequency offset under normal circumstances. Le frequency deviation. [0004] In the satellite communication system, the millimeter-wave frequency band is mostly used, and the frequency of sending and...

AI Technical Summary

Problems solved by technology

[0003] In the ground mobile communication system, the baseband signal processing unit of the terminal is mainly used to estimate and compensate the Doppler frequency offset. However, due to the excessive Doppler frequency offset of satellite communication, the baseband signal processing unit cannot correctly estimate the Doppler frequency offset under normal circumstances. Le frequency deviation

[0004] In the satellite communication system, the millimeter-wave frequency band is mostly used, and the frequency of sending and receiving is relatively high. Generally, the two-stage frequency conversion scheme is used to convert the high-frequency signal to the baseband signal. In the two-stage frequency conversion, the first-stage RF transceiver unit converts the millimeter-wave frequency band. To the lower intermediate frequency frequency, its frequency can be flexibly adjusted, and can be adapted to different transceiver frequencies. The second-stage intermediate frequency transceiver unit generally uses a fixed intermediate frequency, and its purpose is to convert the lower intermediate frequency signal to an analog baseband signal. Therefore, one way of performing Doppler frequency offset processing in the satellite communication system in the prior art may be to calculate the Doppler frequency offset in the baseband signal processing unit, and since the frequency in the first-stage radio frequency transceiver unit is It can be adjusted flexibly, so the Doppler frequency offset is compensated by adjusting the frequency of the RF transceiver unit. The Doppler frequency offset in this way is calculated by the baseband signal processing unit, and its calculation accuracy and rate will be affected by the baseband signal processing. unit processing capability limitation; another way can be to estimate the Doppler frequency offset by the Doppler frequency offset calculation unit, at this time, the compensation of the Doppler frequency offset and the adjustment of the carrier frequency need to be carried out simultaneously, and the two The adjustment amount is synthesized, which increases the complexity of the system, especially when the accuracy of Doppler frequency offset compensation is required to be high, the system design complexity is higher

Images