Frequency domain deviation processing method and device

Abstract

The invention discloses an intermediate frequency processing method for frequency domain deviation, which comprises the following steps: acquiring an input signal which is an intermediate frequency signal; converting the input signal to obtain a converted signal, wherein the converted signal comprises an I-path signal and a Q-path signal, and the I-path signal and the Q-path signal are mutually orthogonal; generating a first orthogonal frequency mixing signal and a second orthogonal frequency mixing signal; obtaining a first multiplication signal according to the I-path signal and the first orthogonal mixing signal; obtaining a second multiplication signal according to the Q-path signal and the second orthogonal mixing signal; and respectively carrying out addition operation and subtraction operation on the first multiplication signal and the second multiplication signal to obtain a frequency domain deviation signal, and moving the frequency domain deviation signal to an intermediate frequency point needing frequency deviation. Compared with a traditional frequency mixing and filtering processing flow, the intermediate frequency processing method omits a filtering processing link, thereby being suitable for a small-range frequency domain offset signal processing scene in which filtering cannot be carried out due to too small frequency offset.

Description

Technical field [0001] The present invention belongs to the field of satellite communication, and more particularly to a method and apparatus for a frequency domain deviation. Background technique [0002] In the field of signal processing, frequency domain characteristic analysis processing is a common and important means that can be easily distinguished by the time domain, and the frequency domain characteristics can be reduced to each other. Interference. In the field of satellite communication and remote sensing, a signal similar to the characteristic is different from the narrowband signal, and the center frequency is different, the other characteristics such as bandwidth, modulation method, and the like) are obtained. The traditional frequency shift can be mixed by the original signal with the local oscillator, and this method is not suitable for small range frequencies of the narrowband signal, and after the mixing method is small, the original signal is left left. The sid...

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Problems solved by technology

The traditional frequency shift can be mixed by the original signal and the local oscillator and then filtered. However, this method is not suitable for small-scale frequency shift of narrow-band signals. Two new frequency signals are generated on the side, and one of the frequency signals is actually needed. Due to the small-scale frequency shift, the two new frequency signals are very small in the frequency domain, and it is difficult to filter them out through the filter.

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