In intermediate frequency
interval, the tooth fracture model does not show an obvious peak in deformation and acceleration amplitude spectrum, while the peak value of healthy tooth model is very obvious.
"Resetting" of distance to 0 at certain distances suggests that the phase measurement is conducted on intermediate frequency
. Since there is no significant correlation between distances and their corresponding DQF's, an insightful investigation is required to determine if DQF can be used for example for weighting of distances.
Thus, each receive channel is down converted to the same intermediate frequency
band centered at 5.8 GHz.
From the intermediate frequency
region, it is observed that the slope value is greater than that observed in the 3% NaCl-diesel solution and similarly the phase angle value (Figure 2).
At the present stage, it is reasonable to use FPGA device, which provides favorable conditions for the down conversion process of the software radio digital intermediate frequency
with its abundant inside resource, parallel processing capacity, and efficient algorithm structure and reconfigurable, to realize the down converter.
The five versions are the LNA (low-noise amplifier), IFA (intermediate frequency
amplifiers), driver amplifiers, gain blocks, and the VGA (variable gain amplifier).
The VSA consists of the new NI PXIe-5605 downconverter, the NI PXIe-5653 local oscillator synthesizer and the NI PXIe-5622, a 150 MS/s intermediate frequency
Scientists noticed that sensors on Barro Colorado recorded an intriguing wave pattern at an intermediate frequency
. They suspected that this pattern could be caused by standing waves in Lake Gatun.
Major characteristics of the radar sensor Carrier frequency 36 GHz Repetition frequency 20 kHz Pulse duration 100 ns Pulse power 20 W Receiver noise figure < 5 dB Intermediate frequency
9 GHz Antenna pattern width: in azimuth [0.25.sup.0] in elevation [3.sup.0] Rotation velocity of the antenna system 0.25 rev/s Power consumption <1 kW Mass < 150 kg Antenna height 5-10 m
Following the PSpice model of the (Intermediate Frequency
) IF stage, we were able to transfer our signal data to Matlab and process the data through digital filter methods.
* On-chip IF (intermediate frequency
) sampling circuit and buffered analog inputs.