CN102735924B - Frequency transient characteristic detector in superheterodyne microwave analyzer and frequency transient characteristic detection method - Google Patents
Frequency transient characteristic detector in superheterodyne microwave analyzer and frequency transient characteristic detection method Download PDFInfo
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Abstract
The invention relates to a frequency transient characteristic detector in a superheterodyne microwave analyzer and a frequency transient characteristic detection method. The frequency transient characteristic detector comprises a data memory unit, a power calculation unit, a phase calculation unit, a signal transient frequency calculation unit, a rule comparator and a memory control unit. By way of digital envelope detection, signal power is monitored in real time and compared with a preset signal power threshold in order to judge whether the signal power can meet preset power detection conditions. The phase difference method is adopted to measure instantaneous signal frequency in real time, and the instantaneous signal frequency is compared with a preset signal frequency range in order to judge whether signal frequency change can meet preset frequency detection conditions. The detector is utilized to judge whether the frequency change characteristics of signals can meet preset frequency change characteristics, and store the currently acquired signal data in order to carry out corresponding testing and analysis.
Description
Technical field
The present invention relates to the frequency transient feature detection device and method in a kind of superhet microwave analysis instrument.
Background technology
Present microwave radio equipment becomes increasingly complex, and the time dependent microwave signal of increasing frequency also needs to carry out test analysis, allows slip-stick artist understand signal frequency behavior in a short time.In order to address this problem in superhet microwave signal analysis instrument, the real-time triggering method of usual employing, real time detection signal feature, signal characteristic is carried out contrast with the testing conditions preset judge, and the data information memory before and after being occurred in the moment meeting testing conditions is got off, thus carry out detailed ex-post analysis.
In order to detect abnormal signal frequency change and stored record signal data, current technology adopts real time spectrum template triggering technique, the principle of this technology: due to signal frequency change time, the frequency spectrum of signal also changes, spectrum mask triggers the change of comparing each frequency spectrum according to spectrum mask definition, detects and trigger the signal spectrum meeting template definition.Implementation as shown in Figure 1, first measured signal is converted to intermediate frequency by superhet microwave analysis instrument usually, then laggard digitized is amplified through intermediate frequency filtering, first intermediate-freuqncy signal after high-speed ADC quantizes needs through Digital Down Convert and filtering extraction process, intermediate-freuqncy signal is become the digital IQ complex signal of zero intermediate frequency, I/Q signal is divided into two-way, one circuit-switched data carries out real time spectrum calculating, the instantaneous spectrum of signal is obtained by calculating signal FFT frequency spectrum in real time, another road enters data-carrier store, and this storer is by the data buffer storage of control realization first in first out.When calculate real time spectrum by with preset spectrum mask compare after, meet trigger preset detection trigger condition time, by generation trigger event, now the signal data in this time period is stored.When the frequency spectrum (201) of signal does not enter default spectrum mask region (203), then do not produce triggering, trigger when the signal spectrum (301) calculated enters default spectrum mask region (302).Now the signal I/Q data that signal becomes in the time range of frequency spectrum (301) from frequency spectrum (201) is stored, thus the detection of frequency transient signal can be realized.
General superhet microwave analysis instrument usually first by measured signal by being converted to intermediate frequency after filtering mixing, intermediate-freuqncy signal amplifies laggard digitized after filtering, intermediate-freuqncy signal after high-speed ADC quantizes is again through Digital Down Convert and filtering extraction process, intermediate-freuqncy signal is become the digital IQ complex signal of zero intermediate frequency, then be stored in a jumbo data-carrier store, signal analysis is nearly all the analyzing and processing of carrying out based on these I/Q data.In order to analyze some special signals or interested signal, microwave signal analyser utilizes detection trigger mechanism usually, real time detection signal feature, carries out selectivity storage to meeting the signal data presetting characteristic condition, thus analyzes interested signal data.
Current superhet microwave signal analysis instrument is all stablized by various triggering or is intercepted and captured various signal thus carry out test analysis.But the means triggered by the feature of measured signal in superhet microwave signal analysis instrument only have video to trigger or power trigger, namely detect the changes in amplitude of measured signal.And the frequency of frequency transient signal changes in time, signal amplitude does not change or changes very little, and the detection therefore cannot carrying out frequency transient feature triggers.
Spectrum mask triggering technique in addition in current real-time spectrum analyzer can detect frequency transient signal by the change of real time detection signal frequency spectrum, thus measured frequency transient signal capture is stored, thus carry out test analysis, but the frequency change of spectrum mask triggering technique detection signal is the FFT frequency spectrum by calculating signal to be obtained, be subject to the restriction of Fourier transform theory, the temporal resolution of the signal frequency change of this technology for detection is subject to the restriction of FFT time span, therefore the fast-changing signal characteristic of frequency can not be detected, especially the signal being shorter than FFT time span to those frequency change times is more inapplicable.
Summary of the invention
For above-mentioned shortcoming, the present invention's Software Radio Theory, adopt digital envelope detection Real-Time Monitoring measured signal power, adopt the instantaneous frequency of the real-time measuring-signal of Phase difference, utilize pick-up unit to judge whether signal frequency Changing Pattern meets testing conditions, thus signals collecting data during measured frequency change stored, and then carry out the test analysis of being correlated with.Wherein whether pick-up unit meets the testing conditions arranged by carrying out detection signal frequency change with the signal power thresholding arranged and signal frequency thresholding.
An object of the present invention is achieved through the following technical solutions:
A frequency transient feature detection device in superhet microwave analysis instrument, this device is used for detecting frequency transient signal and storing, and adopts programmable gate array to realize.Comprise data storage cell, power calculation unit, phase calculation unit, signal transient frequency computation part unit, rule comparator and storage control unit, wherein data storage cell 505, power calculation unit 502 and phase calculation unit 503 receive the I/Q data stream 501 that Digital Down Convert filtering extraction unit exports simultaneously, the signal transient power that power calculation unit 502 exports is input to the first threshold compataror 507 with the lowest signal power threshold 506 preset, the signal transient phase place that phase calculation unit 503 exports is input to signal transient frequency computation part unit 504, the signal transient frequency that signal transient frequency computation part unit 504 exports and the preset signals instantaneous frequency upper limit 508 are input to the second threshold compataror 511, the signal transient frequency that signal transient frequency computation part unit 504 exports and preset signals instantaneous frequency lower limit 509 are input to the 3rd threshold compataror 510, the comparative result that threshold compataror exports all is input to rule processor 515, by rule processor 515 synthetic determination, when signal meets preset rules condition, rule processor 515 exports a control signal to storage control unit 516, this control signal determines that the I/Q data of current correspondence leaves the address in data storage cell 505 in, and storage control unit 516 is used for the access of I/Q data stream of control store.
Detect a method for frequency transient feature, it is characterized in that, the method comprises five steps:
(1) provide three parameter presets that instrument detects frequency transient feature: upper frequency limit, lower-frequency limit and minimum detectable signal power, the frequency separation of lower-frequency limit and upper frequency limit representative illustrates signal frequency range;
(2) provide the preset rules that instrument detects frequency transient feature, the switching between any two of signal condition is defined as N number of action, and this N number of action then indicates N number of preset rules of frequency transient feature;
(3) three parameter presets being set to the input register of corresponding threshold compataror, is the preset signals instantaneous frequency upper limit 508, preset signals instantaneous frequency lower limit 509 and default lowest signal power threshold 506 respectively;
(4) frequecy characteristic of the I/Q data stream of current Real-time Obtaining is detected in real time, until rule processor 515 exports legal control signal;
(5) storage control unit 516 exports legal control signal according to rule processor 515, determines to continue to obtain how many I/Q data, and the I/Q data of acquisition is stored into known position;
(6) read the I/Q data meeting preset rules obtained and analyze.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
Fig. 1 real time spectrum template triggering technique principle
The ultimate principle figure of the general superhet microwave signal analysis instrument of Fig. 2
Fig. 3 is for detecting the pick-up unit of the real-time detection of frequency transient feature
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
The present invention gives a kind of real-time detection method for detecting frequency transient feature and pick-up unit, for detecting frequency transient signal and storing.This device can adopt FPGA (programmable gate array) to realize, and as shown in Figure 3, comprises following components:
Data storage cell 505, power calculation unit 502 and phase calculation unit 503 receive the I/Q data stream 501 that Digital Down Convert filtering extraction unit exports simultaneously, the signal transient power that power calculation unit 502 exports is input to the first threshold compataror 507 with the lowest signal power threshold 506 preset, the signal transient phase place that phase calculation unit 503 exports is input to signal transient frequency computation part unit 504, the signal transient frequency that signal transient frequency computation part unit 504 exports and the preset signals instantaneous frequency upper limit 508 are input to the second threshold compataror 511, the signal transient frequency that signal transient frequency computation part unit 504 exports and preset signals instantaneous frequency lower limit 509 are input to the 3rd threshold compataror 510, the comparative result 512,513 and 514 that threshold compataror 507,511 and 510 exports all is input to rule processor 515, by rule processor 515 synthetic determination, when signal meets preset rules condition, rule processor 515 outputs to storage control unit 516 1 control signals, and this control signal determines that the I/Q data of current correspondence leaves the address in data storage cell 505 in.Storage control unit 516 is used for the access of I/Q data stream of control store.
The method of the detection frequency transient feature that the present invention provides comprises five steps
The first step, provides three parameter preset: upper frequency limit F2, lower-frequency limit F1 and minimum detectable signal power A0 that instrument detects frequency transient feature.The frequency separation of lower-frequency limit and upper frequency limit representative illustrates signal frequency range (F1, F2).
Second step, provide the preset rules that instrument detects frequency transient feature, if represented by the signal transient frequency F of acquisition, signal power A represents.Then there is M state in signal, such as state F ∈ (F1, F2) and A > A0, F ∈ (F1, F2) and A < A0; F > F0 and A > A0 etc., be defined as N number of action by the switching between any for this M state two.This N number of action then indicates N number of preset rules of frequency transient feature.
Three parameter presets are set to the input register of corresponding threshold compataror by the 3rd step, are the preset signals instantaneous frequency upper limit 508, preset signals instantaneous frequency lower limit 509 and default lowest signal power threshold 506 respectively.
4th step, detects in real time to the frequecy characteristic of the I/Q data stream of current Real-time Obtaining, until rule processor 515 exports legal control signal.
5th step, storage control unit 516 exports legal control signal according to rule processor 515, determines to continue to obtain how many I/Q data, and the I/Q data of acquisition is stored into known position.
6th step, reads the I/Q data meeting preset rules of acquisition and analyzes.
Claims (3)
1. the frequency transient feature detection device in a superhet microwave analysis instrument, comprise data storage cell, power calculation unit, phase calculation unit, signal transient frequency computation part unit, rule processor and storage control unit, it is characterized in that, data storage cell (505), power calculation unit (502) and phase calculation unit (503) receive the I/Q data stream (501) that Digital Down Convert filtering extraction unit exports simultaneously, the signal transient power that power calculation unit (502) exports is input to the first threshold compataror (507) with the lowest signal power threshold (506) preset, the signal transient phase place that phase calculation unit (503) exports is input to signal transient frequency computation part unit (504), the signal transient frequency that signal transient frequency computation part unit (504) exports and the preset signals instantaneous frequency upper limit (508) are input to the second threshold compataror (511), the signal transient frequency that signal transient frequency computation part unit (504) exports and preset signals instantaneous frequency lower limit (509) are input to the 3rd threshold compataror (510), the comparative result that threshold compataror exports all is input to rule processor (515), by rule processor (515) synthetic determination, when signal meets preset rules condition, rule processor (515) exports a control signal to storage control unit (516), this control signal determines that the I/Q data of current correspondence leaves the address in data storage cell (505) in, and storage control unit (516) is used for the access of I/Q data stream of control store.
2. the frequency transient feature detection device in a kind of superhet microwave analysis instrument as claimed in claim 1, is characterized in that: this device is used for detecting frequency transient signal and storing, and adopts programmable gate array to realize.
3. detect a method for frequency transient feature, it is characterized in that, the method comprises five steps:
(1) provide three parameter presets that instrument detects frequency transient feature: upper frequency limit, lower-frequency limit and minimum detectable signal power, the frequency separation of lower-frequency limit and upper frequency limit representative illustrates signal frequency range;
(2) provide the preset rules that instrument detects frequency transient feature, the switching between any two of signal condition is defined as N number of action, and this N number of action then indicates N number of preset rules of frequency transient feature;
(3) three parameter presets being set to the input register of corresponding threshold compataror, is the preset signals instantaneous frequency upper limit (508), preset signals instantaneous frequency lower limit (509) and default lowest signal power threshold (506) respectively;
(4) frequecy characteristic of the I/Q data stream of current Real-time Obtaining is detected in real time, until rule processor (515) exports legal control signal;
(5) storage control unit (516) exports legal control signal according to rule processor (515), determines to continue to obtain how many I/Q data, and the I/Q data of acquisition is stored into known position;
(6) read the I/Q data meeting preset rules obtained and analyze.
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| US7734464B2 (en) * | 2005-05-20 | 2010-06-08 | Tektronix, Inc. | RF autocorrelation signal trigger generator |
| US8233569B2 (en) * | 2006-09-28 | 2012-07-31 | Tektronix, Inc. | Realtime spectrum trigger system on realtime oscilloscope |
| US7816904B2 (en) * | 2007-10-09 | 2010-10-19 | Tektronix, Inc. | Modulation signature trigger |
| CN102165324A (en) * | 2008-09-26 | 2011-08-24 | 株式会社艾德温特斯特 | Frequency characteristic measurement device |
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