Testing method for pulse modulated signals

Abstract

The invention discloses a testing method for pulse modulated signals, which comprises the following steps: (1) converting a pulse-modulated signal to a sampled digital signal through an AD sampling unit; (2) converting the sampled digital signal to a pulse baseband signal by a digital frequency converter; and (3) processing the pulse baseband signal in two paths, wherein the first path is used for forming a triggering pulse for controlling and selecting data segments, the second path is stored in a buffer through a data storage / selection control unit; (4) generating a profile envelope of the whole pulse-modulated signal by an envelope demodulating unit; (5) generating a pulse triggering signal from the profile envelope by a pulse envelope shaping unit; (6) generating a triggering data gating signal from the pulse triggering signal by a triggering parameter setting unit; and (7) outputting a corresponding pulse baseband signal to a pulse parameter analyzing unit by a the data storage / selection control unit under control by a gating signal; and performing pulse baseband signal calculation and analysis by the pulse parameter analyzing unit.

Description

technical field [0001] The invention relates to a testing method of a pulse modulation signal used in a signal analyzer. Background technique [0002] At present, signal analysis instruments input a trigger signal from the outside of the instrument, and the pulse edge of the trigger signal corresponds to the time of the signal to be analyzed, so as to trigger the signal analyzer to start scanning and sampling analysis at this time, so that the signal analysis The instrument realizes the analysis of parameters such as the targeted frequency spectrum or signal format of the signal. [0003] Disadvantages of the prior art: it is necessary to input a trigger signal from the outside of the signal analyzer, and at the same time, the trigger signal must accurately correspond to the time of the signal to be analyzed. For the signal generated by the user himself, this trigger signal can be obtained. It is difficult to obtain such time-accurate and synchronous trigger signals for pul...

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Problems solved by technology

[0003] Disadvantages of the prior art: it is necessary to input a trigger signal from the outside of the signal analyzer, and at the same time, the trigger signal must accurately correspond to the time of the signal to be analyzed. For the signal generated by the user himself, this trigger signal can be obtained. It is difficult to obtain such time-accurate and synchronous trigger signals for pulse signals that change at any time. At most, only the allocation of pulses or time slots can be known. When using the spectrum analysis function, the spectrum of all pulses will overlap and cannot be analyzed or distinguished.

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