5 results about "Gain measurement" patented technology

Embodiments of the present disclosure relate to a loop gain measurement probe including a printed circuit board and an injection transformer. The loop gain measurement probe includes a first connection interface and a second connection interface, which are connected with the injection transformer and are connectable with a device under test. The loop gain measurement probe includes a first output and a second output, which are connectable to the test and / or measurement instrument. The loop gain measurement probe includes an input connected with the injection transformer and capable of forwarding an input signal received to the injection transformer. The loop gain measurement probe includes a first passive probe circuit and a second passive probe circuit, which are connected with the first connection interface and the first output as well as with the second connection interface and the second output, respectively.

The application discloses a kind of antenna directional pattern measurement methods based on segmented gain variable threshold single-bit receiver, it is related to synthetic aperture radar radiometric calibration technical field.The method steps are as follows: the monotonic relationship of quantitative signal power and STR is analyzed, and quantitative model is established;The receiving signal amplitude reconstruction strategy of all sampling rate and SAR bandwidth ratio is constructed;The maximum amplitude and minimum amplitude of received signal are determined, the received signal amplitude is segmented and threshold is set;Signal spectrum is analyzed and quantitative signal power is estimated;STR and actual received signal power are calculated;Azimuth and range antenna directional pattern sample value are calculated, and according to radar equation, radar antenna azimuth and pitch gain is calculated, and antenna directional pattern is reconstructed using polynomial fitting.The application simplifies the structure of radar directional pattern gain measurement receiver, reduces the cost, guarantees the measurement accuracy, and can meet the demand of large-scale deployment and high-precision estimation of SAR radiometric calibration active receiver.

A wireless communication device includes a transmit (TX) chain, a loopback path, a receive (RX) chain, a power detector circuit, and a processing circuit. The TX chain generates a TX signal according to a digital TX input. The loopback path is coupled between an output node of the TX chain and an input node of the RX chain, and loops back the TX signal generated from the TX chain to output an RX signal to the RX chain. The RX chain receives the RX signal from the loopback path, and generates a digital RX output according to the RX signal. The power detector circuit performs power detection upon the RX signal at the input node of the RX chain to generate a power detection output. The processing circuit measures an RX gain of the wireless communication device according to at least the power detection output and the digital RX output.

A system comprises a transceiver with at least one receive signal chain and at least one transmit signal chain. The receive signal chain may include an adjustable capacitive attenuator. An automatic gain control circuit may be designed to perform gain measurements in the receive signal chain and adjust the gain by modifying the attenuation at the adjustable capacitive attenuator.

These images display measured data from a vibrometer that measures the acceleration, velocity, displacement, etc. of various industrial equipment. As shown in each image, the measurement value display bar displays the current measurement value, and the length of the bar changes depending on the actual measurement value. The danger value display bar displays the danger value range that the user has set in advance. The user can set any gain for the signal to be measured, and the position of the measurement value upper limit indicator changes depending on the gain setting. The user can adjust the gain while observing the current measurement value to prevent the measurement value from reaching the danger range.