Calibration method and device for passive intermodulation test system based on intelligent search algorithm
A technology of passive intermodulation and testing systems, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as inaccurate stability, unresolved measurement errors, and inaccurate measurements
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Embodiment 1
[0110] The present invention not only solves the problem that the passive intermodulation test system output (dual-tone) carrier power cannot be stabilized at 43dBm (20W) at different operating temperatures and frequencies, but also solves the problem that the test system can test within the entire measurement frequency range. Calibration issues for accuracy. It mainly includes the following three aspects:
[0111] 1. By adding a temperature acquisition and processing module in the hardware circuit, the main control program can collect the working temperature of the high-power amplifier in the passive intermodulation test system in real time.
[0112] 2. Carry out multiple sets of tests on the two carrier power values output by the test port at different temperature points and frequency points through program control, and save the measured data, and perform mathematical operations on these data and 43dBm to obtain the output carrier power error value. In the actual measure...
Embodiment 2
[0172] On the basis of the foregoing embodiments, further, as figure 1 As shown, a passive intermodulation test system calibration device based on an intelligent search algorithm includes two signal sources connected to each other, two attenuators, two power amplifiers, two temperature detection and processing modules, an isolator, and a combination circuit, duplexer, receiver and main control computer, wherein two temperature detection and processing modules are respectively connected to the two power amplifiers for real-time detection of the working temperature of the two power amplifiers. Wherein, the temperature detection and processing module is composed of a temperature sensor 101, an A / D conversion module 102 and a microprocessor 103; the temperature sensor 101 is used for real-time detection of the operating temperature change of the power amplifier, and converts the temperature signal into an electrical signal. signal; the A / D conversion module 102 is used to convert ...
Embodiment 3
[0213] On the basis of the above examples, as Figure 2-3 As shown, a passive intermodulation test system calibration method based on an intelligent search algorithm, which includes the following steps:
[0214] Step 1: Calibrate the output frequency of the signal source on the test port 1;
[0215] Step 2: Accurately stabilize the power of the two carriers output by port 1 at 43dBm at different measurement frequency points;
[0216] Step 3: Use the intelligent search algorithm to calibrate the test accuracy of the passive intermodulation test system. The calibration method, wherein, in the step 1, the method for calibrating the output frequency of the signal source is: measure the frequency of the output carrier signal, obtain the systematic error of each signal source, and then perform frequency correction; set the signal The output frequency of the source is F S , the measured frequency of the output carrier signal is F m , if the two are not equal, the defined frequenc...
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