Method for identifying external automatic signal of preselector-free frequency spectrograph under external mixing mode
A technology for external signals and identification methods, applied in the field of signal identification, which can solve problems such as "multiple" responses
Active Publication Date: 2013-03-06
NO 12 RES INST OF CETC
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Problems solved by technology
In practice, many spectrum analyzers do not have the function of signal identification. When this kind of spectrum analyzer uses external mixer without preselector to spread spectrum, it will inevitably appear "multiple" response phenomenon. In this case, it is necessary to analyze the signal New methods must be sought for accurate spectrum analysis
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example 1
[0115] The spectrum analyzer test system according to the example 1 of the present invention comprises: signal source 101 is 6600A / 1 of MARCONI company; The model is AV12719; the selected spectrum analyzer 103 is HP's 8563E spectrum analyzer; the frequency and amplitude acquisition unit 105 includes an Agilent 82357B USB-GPIB interface card.
[0116] Initialize the spectrum analyzer first, including the selection of the band, the selection of the measurement mode and the setting of the amplitude threshold. The main basis for selecting the amplitude threshold is the size of the noise floor of the spectrum analyzer under the observation bandwidth and resolution bandwidth selected during measurement. In this example, the highest value of the noise floor power level is about -65dBm, and the threshold is set to -60dBm, which means that the power of the input signal after mixing should not be less than -60dBm. The frequency conversion loss of the mixer AV12719 is about 46dB, so the...
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The invention provides a method for identifying an external signal of a preselector-free frequency spectrograph under an external mixing mode, which comprises the following steps of: forming a mixing signal by mixing a harmonic wave of a first-order local oscillation signal from the frequency spectrograph and the external signal in an external mixer; filtering the mixing signal by using an intermediate-frequency filter in the frequency spectrograph to form an intermediate-frequency signal, and displaying multiple response spectral lines corresponding to the intermediate-frequency signal by using the frequency spectrograph; acquiring frequency data of the multiple response spectral lines; and identifying the external signal at intervals according to the acquired frequency of the spectral lines. According to the method, the external signal can be analyzed accurately by the frequency spectrograph without the function of signal identification during the frequency spread of the preselector-free external mixer.
Description
technical field [0001] The invention belongs to the field of frequency spectrum analysis of microwave signals, in particular to a signal identification method. Background technique [0002] At present, the operating frequency of the all-in-one spectrum analyzer can reach up to 70GHz. In order to enable such a spectrum analyzer to work at a higher frequency, it is generally necessary to connect an external mixer to spread the spectrum of the spectrum analyzer. The operating frequency of the spectrum analyzer using the external mixer can even reach 320GHz. There are two types of external mixers, one with a preselector and the other without a preselector. A mixer with a preselector is much more expensive than a mixer without a preselector, and the highest operating frequency of a mixer with a preselector on the market can only reach 75GHz, and it can only work above 75GHz. Mixers without preselectors can be used. [0003] Usually, the external mixer that spreads the frequen...
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IPC IPC(8): G01R23/16
Inventor 梁友焕李镇远冯进军
Owner NO 12 RES INST OF CETC