An ultra-wideband microwave receiver and its signal segment processing method

Abstract

The present invention provides an ultra-wideband microwave receiver and a signal segment processing method thereof. The method includes the steps of dividing an input signal of a receiver into a first low-band signal and a high-band signal; performing uplink mixing on the first low-band signal with a fixed local oscillation signal to obtain a second low-band signal; gating the second low-band signal with the high-band signal through a microwave switch to obtain an output signal and mixing the output signal with a wideband local oscillation signal to obtain a first intermediate frequency signal. The ultra-wideband microwave receiver and the signal segment processing method thereof effectively suppress harmonic interference signals and cross interference signals through signal segment processing for the multi-octave ultra-wideband receiver so as to improve the anti-interference performance of the receiver and reduce the design difficulty of wideband local oscillation and have good practicality and application prospects.

Description

technical field [0001] The patent of the invention belongs to the field of microwave receiver design, and in particular relates to an ultra-wideband microwave receiver and a signal segment processing method thereof. Background technique [0002] The microwave receiver mainly completes the pre-selection, filtering, limiting, amplification, frequency conversion and other processing of the signal to meet the requirements of subsequent further signal processing. [0003] With the continuous expansion of the signal frequency band, the signal processing range of the receiving system is required to be wider and wider, and gradually develop towards multi-octave broadband and ultra-wideband reception. However, due to the nonlinear effects of amplifiers, mixers and other devices, interference signals such as harmonics and intermodulation will be generated, especially when the receiver’s operating frequency band is multi-octave, the above interference signals become difficult to suppre...

AI Technical Summary

Problems solved by technology

In the traditional scheme above, in order to effectively suppress the image frequency, the superheterodyne receiving method with double frequency conversion is often used. The first intermediate frequency signal frequency obtained after the first mixer processing is relatively high. If it is within the frequency range of the receiving signal of the machine, the signal leakage, harmonic interference, intermodulation interference, etc. generated by the signal mixing will easily fall into the effective bandwidth range of the first intermediate frequency signal, and it is difficult for subsequent filters to filter out, affecting effective operation of the receiver

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