Linearity test method and device of active calibration body power amplifier

A power amplifier and calibrator technology, which is applied in the field of linearity testing of ground active calibrator power amplifiers, can solve problems such as the inability to meet the linearity test requirements of active calibrator power amplifiers, and the small dynamic range of power meters. , to achieve the effect of large dynamic range linearity test

Active Publication Date: 2021-06-11
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the dynamic range of the power meter used in the existing ground active calibrator power amplifier linearity test method is small, ...

Method used

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  • Linearity test method and device of active calibration body power amplifier
  • Linearity test method and device of active calibration body power amplifier
  • Linearity test method and device of active calibration body power amplifier

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Embodiment 1

[0058] Such as figure 1 As shown, the method for testing the linearity of the active calibrator power amplifier provided by the embodiment of the present invention includes the following steps S1 to S3.

[0059] Step S1. Control the signal source to output a radio frequency signal with step-change power, and use a spectrum analyzer to read the power of the radio frequency signal to obtain the combined range error of the signal source and the spectrum analyzer.

[0060] In order to adapt to the application of large dynamic range, the signal source 1 and the spectrum analyzer 5 are equipped with different attenuation gears inside. In the application of large dynamic range testing, the change of the attenuation gear will cause range errors. This part of the error needs to be calibrated out. Calibration The process is shown in step S1 above.

[0061] The above step S1 only needs the signal source 1, the spectrum analyzer 5 and the computer 6, and the adopted device structure is a...

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Abstract

The invention relates to a linearity test technology of a ground active calibration body power amplifier. The linearity test method of the active calibration body power amplifier comprises the following steps: S1, controlling a signal source to output a radio-frequency signal with stepped power change, and reading the power of the radio-frequency signal by using a frequency spectrograph to obtain a combined range error of the signal source and the frequency spectrograph; S2, controlling the signal source again to output the radio frequency signal with the power changing step by step, amplifying the radio frequency signal through the to-be-tested power amplifier, reading the power value of the output signal of the power amplifier through the frequency spectrograph, and obtaining the linearity test value of the power amplifier; and S3, calculating the actual linearity error value of the power amplifier by using the test results of the steps S1 and S2. According to the linearity test device of the active calibration body power amplifier, the computer is connected with the signal source and the frequency spectrograph, and the signal source, the adjustable attenuator, the power amplifier to be tested, the high-power attenuator and the frequency spectrograph are connected in sequence.

Description

technical field [0001] The invention relates to the technical field of spaceborne radar, in particular to the linearity testing technology of the ground active calibrator power amplifier used in the process of marking the antenna pattern of the spaceborne radar on orbit. Background technique [0002] When the ground active calibration body realizes the timing of the antenna pattern of the spaceborne radar on-orbit, it needs to achieve high-precision calibration of the antenna pattern with a range greater than 40dB. RCS simulation, which puts high demands on the linearity of the active calibration body. [0003] The power amplifier can achieve high-power amplification of the calibration signal, thereby generating a high-signal-to-noise ratio signal, which is necessary for an active calibration body. However, due to the nonlinear effect of the power amplifier, especially near the 1dB compression point In the non-linear area, if the active calibration signal falls in this area...

Claims

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Application Information

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IPC IPC(8): G01R31/28
CPCG01R31/28
Inventor 张云张达凯沈小玲冯孝斌李熙民刘胤凯王晓邵景星苗苗冯雨李万珅
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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