PID-based field intensity radiation automatic test system control method

Abstract

The invention discloses a PID-based field intensity radiation automatic test system control method, which comprises the following steps: controlling a signal source to output a radio frequency signal with set power, amplifying the signal by a power amplifier and radiating the signal outwards by an antenna, and transmitting acquired antenna radiation field intensity data to a field intensity meter by a field intensity probe; and calculating the difference between the current field intensity value and the target field intensity value by using a PID control module built in the control software, and feeding back the result to the signal source to adjust the set output power, so that the field intensity value of the antenna radiation reaches the target field intensity value. From the perspective of the whole system, nonlinear characteristics of each device are fully considered, a target field intensity value is calculated and adjusted in real time by adopting PID and is converted to a signal source, closed-loop control of a whole system loop is realized by adjusting the input power of the signal source and indirectly controlling the output power of a power amplifier, the stability and the working speed of the system are improved, and the over-pushing problem caused by the fact that the flatness of the power amplifier does not reach the standard is solved.

Description

Technical field [0001] The present invention relates to field strong radiation testing techniques, and in particular, it is to relate to a PID-based field strength radiation automatic test system control method. Background technique [0002] At present, the domestic field strong radiation automatic test system, in order to achieve the measurement test test, in order to achieve the target field strength, it is mainly achieved by direct control amplifier output power, but due to the temperature amplifier output power, Yuan Factors such as thermal performance of devices have more affected, resulting in power amplifier output power curves and non-rule linear, logarithmic or index curves. [0003] If power control is directly controlled, it is difficult to accurately control the power amplifier output power. To control the power amplifier output power, the common practice is to adopt equal spacing to power amplifier, so that the target power P is divided into N, each time Only the pow...

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Problems solved by technology

[0002] At present, the domestic field strength radiation automatic test system, in order to achieve the target field strength in the field strength test of the DUT, is mainly realized by directly controlling the output power of the power amplifier when pushing the power amplifier, but because the output power of the power amplifier is affected by temperature, element Factors such as device thermal performance have a great influence, resulting in a power amplifier output power curve that is not a regular linear, logarithmic or exponential curve

[0003] If the power of the power amplifier is directly controlled, it is difficult to accurately control the output power of the power amplifier. If you want to directly control the output power of the power amplifier, the common practice is to add power to the power amplifier at equal intervals, that is, divide the target power P into N equal parts, each time Only increase the power of P / N to the power amplifier. After N times, the output power of the power amplifier can be pushed to the target power P, but this method is greatly affected by the distance N. If N is set too large, the power amplifier must be pushed to the target power It takes a long time; if the N setting is too small, due to factors such as the flatness of the power amplifier, at some frequency points, because the flatness of the power amplifier is not fully up to the standard, if the power of the power amplifier is pushed at equal intervals, overpush may occur situation, causing the power amplifier to burn out

[0004] Another method to directly control the output power of the power amplifier is to use PID to directly control the output power of the power amplifier. This method can quickly and effectively push the output power of the power amplifier to the target power, but this method only considers the nonlinear characteristics of the power amplifier itself. For the entire test system, the non-linearity of all test equipment and test links in the system is not considered

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