As I am working on LAbview and I am getting some problems related to it. Some of the blocks are not in library, which are marked with black circle in the attachment. Simply I have to estimate the phasors with the help of recursive and non-recursive algorithm in LABVIEW in the attached file, nonrecursive algorithm have been used where,A 50-Hz signal x(t)=230 cos (120*pi*t+pi/4) is sampled at a frequency of 600 Hz i.e. 12 samples per cycle are taken. First 20 samples are obtained and phasor estimate through recursive and nonrecursive are evaluated. The data window is of 12 samples. Since phasor estimation is performed over a cycle, the first phasor is obtained after obtaining 12 samples i.e. after one complete cycle of the sinusoid. The phasor output in polar form for recursive and nonrecursive estimates as obtained from Labview front panel as shown in attachment.
The input signal can be generated from library VI i.e. Simulate Signal VI. This signal can also be real time acquired from a data acquisition system like NI ELVIS which is compliant with Labview. This analog input signal is then converted to discrete signal with A2D VI and stored in an array. Here data window is considered for 12 samples. A user defined VI has to be prepared for calculating the Fourier coefficient of the data samples. Appropriate arithmetic operations are performed to estimate phasor for first data window. The complex term obtained after phasor calculation is converted into polar form and displayed as output. This algorithm is repeated for subsequent data samples.
I am not able to understand the blocks used, because they are not in library. simply, i have to estimate the phasors with the help of recursive and non-recursive algorithm in LABVIEW of x(t)=230 cos (120*pi*t+pi/4), 50 Hz signal which is sampled at a frequency of 600 Hz i.e. 12 samples per cycle are taken.
The bottom ones are just "build array" (the two on the left part) and "Index^Bundle cluster array".
The top one though should be somewhere in your library - if not - you may use "To double precision complex"
The best way to share any LabVIEW code is to use snippet: Mark piece of code you want to share, then Edit»Create VI Snippet from Selection.
http://www.ni.com/tutorial/9330/en/
Either construct it using Labview blocks from Matehamtics palette or use the Formula node and write it in.
You need to use the function: polar to complex.
Cheers
Gustav
configure the polar plot as in the example I have already sent you
now it shows one small dot (as you have only one point)
you need to add another point in (0,0), and set display for line (instead of point)
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