Linear average value detector realizing method based on software defined radio

Abstract

The invention provides a linear average value detector realizing method based on the software defined radio. The method comprises the steps of conducting signal sampling on an analog intermediate frequency, dividing a sampled signal processed by a digital intermediate frequency into a cophase component signal and an orthogonal component signal and sending the cophase component signal and the orthogonal component signal, restoring an intermediate frequency enveloping signal from the cophase component signal and the orthogonal component signal, conducting analog simulation network operation on the intermediate frequency enveloping signal, and acquiring a maximum detection value of analog simulation network output to serve as the output voltage of a linear average value detector. Compared with a conventional analog circuit realizing method, the linear average value detector realizing method based on the software defined radio has the advantages of being capable of improving measurement stability and uniformity of the linear average value detector, reducing the size and weight of a measurement instrument and obtaining a higher measurement speed, and especially capable of achieving reconstruction of the linear average value detectors with different time constants fast and conveninetly and reducing designing and debugging cost.

Description

technical field [0001] The invention belongs to the technical field of a linear average value detector in electromagnetic compatibility testing, and in particular relates to a method for realizing a linear average value detector based on software radio. Background technique [0002] With the acceleration of various electronic products entering the market, electromagnetic compatibility testing is getting more and more attention in product testing, not only in certification testing laboratories, but also in research and development, testing and quality inspection departments of major electronic product companies , EMC testing is also becoming an important link. [0003] When performing electromagnetic interference emission (EMI) measurement, it is necessary to adopt different test layouts, test methods and auxiliary test equipment for different types of interference sources and propagation methods. But one thing is the same, this kind of test needs to use high sensitivity ele...

AI Technical Summary

Problems solved by technology

[0007] During the use of the conventional implementation method of the linear average detector, it is found that due to factors such as temperature instability in the analog circuit, the measurement results often have a relatively large deviation from the real value.

Moreover, the new CISPR standard requires at least two linear average detectors with different time constants (important parameters that affect detector performance), which increases the difficulty of circuit design and increases the cost of related production and debugging

If the analog circuit board is installed in the EMI receiver, it will also increase the volume and weight of the equipment, which is not conducive to the handling of the instrument and the use of users

In addition, the processing time of the linear average detector implemented by the analog circuit is relatively long, which brings inconvenience to the user

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