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Can we get change in signal due to doppler shift (only Fd) by subtracting receiving signal with original one? Assuming that I have equalized the phase of both signals by some means.
So, it will be a jumble of frequencies between (Fc + 1.5) and (Fc - 1.5). All the frequencies will lie in this range. Right?
What I want is just to detect whether a man is alive under the rubble. I think it will give me at least detection signal to detect alive human. Isn't it?
Let consider, rate of change in velocity constant. That is the rate with which distance is changing is constant (probably will) then Won't Fn be (Fc + 1.5) in one direction and (Fc - 1.5) in another (considering the change in frequency is 1.5 Hz in one side)?
What would exactly be the signal at...
Hi Guys,
One thing is confusing me. Let say I have a sine signal of frequency 'Fc' and I transmit it. It comes back bouncing from a moving object (Lets assume human's heart). I am assuming environment free of noise for the time. Then Would the coming signal be sin(2*pi*Fn*t + theta) where Fn =...
Re: Detection of 3 Hz doppler shift in 1.2GHz signal
Thanks vfone and SunnySkyguy.
Actually, the error could be tolerated. We want not to extract the 3Hz signal completely. What we want is, to detect the alive human body whether someone is there. Are you talking about first method or second?
Re: Detection of 3 Hz doppler shift in 1.2GHz signal
Thanks FvM.
Yes. It would be phase or frequency modulated signal we will receive.
It would be something like the image.
Actually, Could that be possible to extract the heart beat component from the modulated signal? I am afraid by taking...
Detection of 3 Hz doppler shift in 1.2GHz signal
Hi everyone,
Actually It's my final year project to make a system that will detect the alive human bodies under the debris in case of catastrophic situations. Well, I've got two methods to accomplish this task.
First one is, send 1150MHz wave...
Thanks everyone.
I also think it is KS0108/KS0107 based because i found a datasheet with the part JYG-12864A4C-VA (only two characters change from mine's). I have traced power and ground connections. There are also 8 copper traces that have specific pattern. I think it should be data bus. I...
Hi,
I have graphic LCD JYG-12864B4C-VB . But the problem is that i don't have its datasheet. I searched the whole Google but didn't find. If anyone of you have used this GLCD, kindly share its datasheet.
Thanks
Datasheet says there must be appropriate delay depending on the impedance before setting the Go_Done bit. I don't know, how much delay there is in MikroC built-in ADC function. I made a new function and set the delay. So that there should be no doubt on acquisition delay.
Today i added the acquisition delay. But the problem was same. ADC result is not constant. Fluctuating 4 to 5 digits up and down.
Here is the code for reading ADC result.
unsigned int ADCread(unsigned char channel)
{
delay_us(40);
ADCON0 = (channel << 2) | 1 | (0x80); ...
I am using external power supply to power up the microcontroller which is linear power supply and was good designed with minimum ripple. I am pretty sure VDD or Vref is not an issue. The issue is the noise coming from power supply voltage that i want to measure. How i can eliminate that noise? I...
I mistakenly uncomment the ADC_Read(0) line. This is the correct code.
k = 0;
count = 0;
while(count<64) {
k = k + ADC_Read(7);
count++;
}
k = k >> 6;
Can you give me explanation how linear voltage regulator is better than resistor network?
and any example of linear voltage...
I only had the potentiometer before ADC, one terminal to 9V and other terminal to Gnd . Center terminal to ADC. I made sure i would never exceed the 1023.
I was using three ADC channels and was suffering this problem (non-linear). I dont know why. But then i changed the code for only one ADC...
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