Method for improving amplitude measurement accuracy of band switching frequency point

Abstract

The invention provides a method for improving the amplitude measurement accuracy of a band switching frequency point. The method for improving the amplitude measurement accuracy of the band switching frequency point comprises the following steps of A, setting a band buffer area at a band switching place; and B, avoiding band switching during scanning, and keeping the scanning performed in the same band channel. According to the scheme, reduction in the amplitude accuracy at the band switching frequency point is avoided, and noise platforms and signal distortion phenomena during narrow-band scanning measurement are avoided.

Description

technical field [0001] The invention belongs to the field of frequency spectrum analysis and measurement, and in particular relates to a method for improving the accuracy of amplitude measurement at a band switching frequency point. Background technique [0002] Spectrum analyzers are indispensable test instruments in the fields of communication, radar, navigation, and signal monitoring. Microwave spectrum analyzers usually use a superheterodyne receiver solution. Because microwave spectrum analyzers have a wide frequency range, they need to be Dividing the receiver into multiple bands, due to the differences in the performance indicators of microwave devices such as microwave switches and filters selected for each band, the frequency conversion gain of each band in the receiver is inconsistent. Such as figure 1 It is a functional block diagram of the microwave frequency conversion module of a microwave spectrum analyzer. From figure 1 It can be seen from the figure that ...

AI Technical Summary

Problems solved by technology

For example, the Nth Bucket contains data points of two bands, the actual detection point is in the previous band, and at the same time, the compensation data of the compensation point in the latter band is used for data compensation, resulting in a decrease in the amplitude accuracy of this point

For wider spans such as figure 2 The input amplitudes of Cursor 1 and Cursor Δ1 shown are the same, but due to the mismatch between the actual detection point frequency and the displayed frequency band, the amplitude displayed at the switching band frequency point becomes the value displayed by Cursor 1, and the amplitude accuracy The decrease is obvious; it also occurs when the span is narrow. Because the frequency conversion gain of each band is inconsistent, the compensation data value of the data compensation point of the previous band and the data compensation point of the next band are very different, which will cause obvious noise. Signal Distortion Problem

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