CN-122017367-A - Pulse modulation signal power and spectrum characteristic based measurement method

CN122017367ACN 122017367 ACN122017367 ACN 122017367ACN-122017367-A

Abstract

The invention relates to the technical field of signal measurement, and particularly discloses a pulse modulation signal power and spectrum characteristic measurement method, which is used for carrying out parallel acquisition on a pulse modulation signal, extracting amplitude envelope data and instantaneous phase data, carrying out numerical analysis on the instantaneous phase data to obtain carrier frequency deviation value, comparing the carrier frequency deviation value with a preset frequency point set to generate carrier frequency matching zone bits, detecting the arrival time of a pulse rising edge according to the amplitude envelope data, carrying out joint judgment on the carrier frequency matching zone bits to output a frequency selective trigger signal, dynamically adjusting the central frequency and a gating window of frequency domain measurement according to the trigger signal, acquiring frequency domain spectrum data, carrying out time sequence correlation on a carrier frequency value, a time domain envelope parameter and the frequency domain spectrum data, and constructing a multidimensional correlation data chain.

Inventors

XIA YUZHU
ZHANG WENJIE
HU RUHUAN

Assignees

四川金投科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (9)

1. The pulse modulation signal power and spectrum characteristic based measurement method is characterized by comprising the following steps of: S1, carrying out parallel acquisition on a received pulse modulation signal, and respectively extracting an amplitude envelope and an instantaneous phase of a pulse to obtain amplitude envelope data and instantaneous phase data; S2, carrying out numerical analysis on the instantaneous phase data, obtaining the carrier frequency deviation value of the current pulse, and comparing the carrier frequency deviation value with a preset frequency point set to generate a carrier frequency matching zone bit; S3, detecting the rising edge arrival time of the pulse according to the amplitude envelope data, carrying out joint judgment on the rising edge arrival time and the carrier frequency matching zone bit, and outputting a frequency selective trigger signal when two conditions are met simultaneously; s4, dynamically adjusting the central frequency of the frequency domain measurement and a gating window according to the frequency selective trigger signal, enabling the gating window to align with the rising edge of the pulse in the time dimension and match with the actual carrier frequency of the current pulse in the frequency dimension, and acquiring frequency domain spectrum data; And S5, carrying out time sequence association on the time domain envelope parameter and the frequency domain spectrum data which are obtained by analyzing the carrier frequency value and the amplitude envelope data corresponding to the frequency selective trigger signal, and constructing a multidimensional association data chain containing the pulse sequence number, the carrier frequency value, the time domain envelope parameter and the frequency domain spectrum characteristic.
2. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 1, wherein S1 specifically comprises: Carrying out quadrature mixing treatment on the received pulse modulation signal to obtain an in-phase component and a quadrature component; performing envelope detection on the in-phase component to obtain amplitude envelope data; and performing arctangent operation on the in-phase component and the quadrature component to obtain instantaneous phase data.
3. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 1, wherein S2 specifically comprises: Carrying out phase continuous processing on the instantaneous phase data to obtain a continuous phase sequence; Performing sliding window differential operation on the continuous phase sequence to obtain an instantaneous frequency sequence; Performing difference operation on the instantaneous frequency sequence and a preset reference frequency to obtain a carrier frequency deviation value; Comparing the carrier frequency deviation value with the allowable deviation threshold value of each frequency point in the preset frequency point set one by one, and if the carrier frequency deviation value falls into the threshold value range of any frequency point, generating a carrier frequency matching zone bit corresponding to the corresponding frequency point.
4. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 3, wherein said performing phase-continuous processing on instantaneous phase data to obtain a continuous phase sequence comprises: The instantaneous phase data are sequentially read according to time sequence, and difference value operation is carried out on the phase values of two adjacent moments to obtain a phase difference value; judging whether the absolute value of the phase difference value exceeds a preset threshold, if so, judging that the current phase value has phase jump, and calculating a compensation value according to the sign of the phase difference value; and accumulating the compensation value and all phase values after the current moment to obtain a continuous phase sequence for eliminating jump.
5. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 1, wherein the step S3 specifically comprises: carrying out gradient operation on the amplitude envelope data, and extracting the moment when the gradient value changes from negative to positive and exceeds a preset threshold value to obtain the rising edge arrival moment; aligning the time window of the rising edge arrival time with the time corresponding to the carrier frequency matching zone bit, and judging whether the rising edge arrival time and the carrier frequency matching zone bit are in the same preset time window or not; And when the rising edge arrival time and the carrier frequency matching zone bit are simultaneously met in the same time window, generating a frequency selective trigger signal.
6. The pulse modulated signal power and spectral feature based measurement method of claim 5, wherein said gradient computing of the amplitude envelope data further comprises: Carrying out five-point weighted smoothing treatment on the amplitude envelope data according to the time sequence to obtain a smooth envelope sequence; Performing difference operation on two adjacent data points in the smooth envelope sequence to obtain a gradient sequence; and carrying out symbol discrimination on the gradient sequence, extracting initial positions of which more than three continuous gradient values are positive values and the gradient value corresponding to the first positive value exceeds a preset threshold, and taking a time point corresponding to the initial position as the rising edge arrival time.
7. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 1, wherein S4 specifically comprises: Performing pulse expansion processing on the frequency selective trigger signal to generate a gating window matched with the pulse width; the carrier frequency value corresponding to the frequency selective trigger signal is used as the central frequency of frequency domain measurement, and the local oscillation frequency is locked; And during the effective period of the gating window, frequency domain data acquisition is carried out by using the locked local oscillation frequency, so as to obtain frequency domain spectrum data.
8. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 7, wherein said performing pulse spreading on the frequency-selective trigger signal comprises: the method comprises the steps of inputting a frequency selective trigger signal to an edge detection unit, extracting the rising edge of the trigger signal, starting a timer to perform real-time timing by taking the rising edge as a starting point, and inputting amplitude envelope data to a width comparator; When the amplitude envelope data is reduced to a preset threshold value, the width comparator outputs a stop signal, stops the timer and records a pulse width value; And generating a gating window with corresponding width according to the pulse width value, enabling the initial edge of the gating window to be aligned with the rising edge, and ending the moment when the edge alignment amplitude envelope data is reduced to a preset threshold value.
9. The method for measuring power and spectral characteristics of a pulse-based signal according to claim 1, wherein S5 specifically comprises: taking the frequency selective trigger signal as a time reference, and recording an absolute time stamp corresponding to each trigger; Performing time axis matching on the time domain envelope parameters obtained by analyzing the amplitude envelope data and the absolute time stamp, and extracting the time domain envelope parameters with the smallest deviation from the absolute time stamp as the associated time domain parameters of the current pulse; performing time axis matching on the frequency domain spectrum data and the absolute time stamp, and extracting the frequency domain spectrum data with the smallest deviation from the absolute time stamp as the associated frequency domain data of the current pulse; And converting the absolute time stamp into an incremental pulse sequence according to the triggering sequence, binding the pulse sequence with the carrier frequency value, the associated time domain parameter and the spectrum characteristic in the associated frequency domain data, and generating a multidimensional associated data chain.

Description

Pulse modulation signal power and spectrum characteristic based measurement method Technical Field The invention relates to the technical field of signal measurement, in particular to a pulse modulation signal power and spectrum characteristic measurement method. Background The pulse modulation signal is widely applied to the fields of radar, communication, electronic countermeasure and the like, and the power parameter and the frequency spectrum characteristic of the pulse modulation signal are key bases for evaluating the performance of a transmitter, identifying the type of the signal and verifying the index of a system. In the prior art, a mode of cooperative test of a broadband oscilloscope and a spectrum analyzer is generally adopted for measuring a pulse modulation signal, and synchronization of time domain measurement and frequency domain measurement is realized through an external trigger signal, so that time domain envelope parameters and frequency domain spectrum characteristics of pulses are respectively obtained. In the frequency agile radar or frequency hopping communication scene, the carrier frequency of the pulse signal jumps rapidly in each pulse period, the existing measurement technology can only realize the triggering synchronization on the time domain based on the pulse amplitude threshold, the judgment condition of the frequency dimension cannot be introduced in the triggering link, the frequency dimension mismatch is generated due to the fact that the frequency hopping carrier frequency cannot be tracked dynamically by the gating window of the spectrum analyzer, meanwhile, the precise corresponding relation cannot be established due to the lack of the frequency-time joint identification between the pulse envelope captured by the time domain and the frequency spectrum measured by the frequency domain, and therefore the accurate screening measurement of the specific frequency point pulse in the frequency hopping sequence and the verification of the synchronous relation between the frequency switching moment and the pulse envelope are difficult to realize. Disclosure of Invention The present invention is directed to a method for measuring power and spectral characteristics of a pulse-modulated signal, which solves the above-mentioned problems. The aim of the invention can be achieved by the following technical scheme: a method for measuring power and spectral characteristics based on pulse modulation signals comprises the following steps: S1, carrying out parallel acquisition on a received pulse modulation signal, and respectively extracting an amplitude envelope and an instantaneous phase of a pulse to obtain amplitude envelope data and instantaneous phase data; S2, carrying out numerical analysis on the instantaneous phase data, obtaining the carrier frequency deviation value of the current pulse, and comparing the carrier frequency deviation value with a preset frequency point set to generate a carrier frequency matching zone bit; S3, detecting the rising edge arrival time of the pulse according to the amplitude envelope data, carrying out joint judgment on the rising edge arrival time and the carrier frequency matching zone bit, and outputting a frequency selective trigger signal when two conditions are met simultaneously; s4, dynamically adjusting the central frequency of the frequency domain measurement and a gating window according to the frequency selective trigger signal, enabling the gating window to align with the rising edge of the pulse in the time dimension and match with the actual carrier frequency of the current pulse in the frequency dimension, and acquiring frequency domain spectrum data; And S5, carrying out time sequence association on the time domain envelope parameter and the frequency domain spectrum data which are obtained by analyzing the carrier frequency value and the amplitude envelope data corresponding to the frequency selective trigger signal, and constructing a multidimensional association data chain containing the pulse sequence number, the carrier frequency value, the time domain envelope parameter and the frequency domain spectrum characteristic. As a further scheme of the invention, the S1 specifically comprises the following steps: Carrying out quadrature mixing treatment on the received pulse modulation signal to obtain an in-phase component and a quadrature component; performing envelope detection on the in-phase component to obtain amplitude envelope data; and performing arctangent operation on the in-phase component and the quadrature component to obtain instantaneous phase data. The invention further provides a further scheme that the S2 specifically comprises the following steps: Carrying out phase continuous processing on the instantaneous phase data to obtain a continuous phase sequence; Performing sliding window differential operation on the continuous phase sequence to obtain an instantaneous frequency sequence; Performing difference opera