Method for monitoring constant standing-wave ratio
A standing wave ratio and wave detector technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems affecting the practicability of standing wave detection circuits, electromagnetic interference of wave detectors, etc., and achieve the expansion of working dynamic range, Overcoming the effect of changing the decision threshold
Inactive Publication Date: 2010-12-01
SICHUAN JIUZHOU ELECTRIC GROUP
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Problems solved by technology
[0004] In addition, existing standing wave detection circuits often need to use linear detection circuits. At present, the maximum input power of linear detection with integrated circuits is generally not greater than 10dBm. In high-power circuits, detectors with small maximum input power are susceptible to electromagnetic waves caused by large signals. interference, which affects the usefulness of the standing wave detection circuit
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[0024] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0025] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0026] In the prior art, there is already a device for monitoring the standing wave ratio, and its principle diagram is as follows figure 1 shown. However, in the existing standing wave ratio monitoring device, the attenuator is used only when the forward transmission coupling signal output by the radio frequency signal is too large, and is used to attenuate the signal to a certain range, so that the detector can work normally in this range ...
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The invention discloses a method for monitoring the constant standing-wave ratio and belongs to the field of monitoring the standing-wave ratio of a radio frequency circuit. The method for monitoring the constant standing-wave ratio mainly comprises the step of warning the standing-wave ratio of the radio frequency circuit without measuring the quantitative value of the standing-wave ratio when the standing-wave ratio exceeds a threshold value. Therefore, by attenuating a positive coupling signal a certain determined value more than a reverse coupling signal, the relative size of the coupled output signals is compared through a detector, wherein the relationship between the attenuation value L0 and a warning threshold value VSWR0 is L0(dB)=-20*1g[(VSWR0-1) / (VSWR0+1)], and the attenuated positive and reverse coupling signals pass through symmetrical designed detector 1 and detector 2 respectively, wherein the two detectors do not have linear detection characteristics. The method for monitoring the constant standing-wave ratio can monitor the deteriorative standing-wave ratio conditions of the radio frequency circuit under different temperatures, different output powers and different working frequencies, and warn when the standing-wave ratio exceeds the set value.
Description
technical field [0001] The invention relates to a monitoring technology of a standing wave ratio, in particular to a monitoring method for a constant standing wave ratio. Background technique [0002] In radio frequency circuits, in order to monitor the normal transmission and amplification of radio frequency signals in the circuit, it is often required in engineering that the standing wave ratio of the circuit should not exceed the set value. If it exceeds a certain range of the set value, it needs to be able to give an alarm in time to monitor the circuit status. [0003] The existing standing wave detection circuit often needs to convert the forward-coupled and reverse-coupled radio frequency signals into low-frequency signals after passing through the logarithmic linear detector, and then pass AD conversion for processing by digital circuits such as single-chip microcomputers or FPGAs. The experimental data establishes the correspondence table of standing wave ratio. T...
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Inventor 李小华
Owner SICHUAN JIUZHOU ELECTRIC GROUP