Pre-compensation of transient response

Started by Bob Masta in comp.dsp4 years ago 17 replies

I have a user who wants to produce high-intensity acoustic tone bursts for SODAR (acoustic radar). The transducer adds an unwanted transient...

I have a user who wants to produce high-intensity acoustic tone bursts for SODAR (acoustic radar). The transducer adds an unwanted transient overshoot and ringing. The same tone burst will be used repeatedly. It occurs to me that the digitally-generated driving signal to the transducer could be pre-compensated to produce an acoustic signal of the desired shape. My first thought is that...


Estimate chirp shift Doppler

Started by Fox in comp.dsp13 years ago 12 replies

Hello, I have a question for you. I have to simulate the signal received in a radar system by applying a time delay and a doppler shift. By now...

Hello, I have a question for you. I have to simulate the signal received in a radar system by applying a time delay and a doppler shift. By now I have delayed the original signal and I have estimated the delay by correlating the original transmitted signal with the received one and by picking the max. Now I have to estimate the shift in frequency but I don't know how to proceed. I think I s...


problems with chirp LFM impulse in radar

Started by Davide in comp.dsp15 years ago 2 replies

Hi to everyone,: how can I extract Doppler information from a chirp impulse LFM like cos(2*pigreco*f0*t+k*pigreco*t^2) ?; At receiver I have...

Hi to everyone,: how can I extract Doppler information from a chirp impulse LFM like cos(2*pigreco*f0*t+k*pigreco*t^2) ?; At receiver I have cos(2*pigreco*f0*(t-2R/c)+k*pigreco*(t-2R/c)^2), multipling by cos(2pigrecof0t) and low pass filtering I obtain cos(-2*pigreco*f0*2R/c+k*pigreco*(t-2R/c)^2). I would like to get this term apart from others: cos(-2*pigreco*f0*2R/c) to work it on. Thank...


Problem in MUSIC Algorithm for DOA Estimation

Started by amit00 in comp.dsp11 years ago 3 replies

Hi all......... I want to find out angle of arrival using planer antenna array for radar (Digital Monopulse) application. For concept...

Hi all......... I want to find out angle of arrival using planer antenna array for radar (Digital Monopulse) application. For concept development, first i make 2x2 planer array, and try to find out direction of arrival of sources, further i need to make null at the direction of interference. which algorithm is better for that???? or MUSIC algorithm is suitable for that???? I try to use MU...


FFT in blocks

Started by Al in comp.dsp12 years ago 10 replies

Hi everybody! I have a question regarding FFT. I'm working with radar data & matlab. I have a block of data of 512 samples and I'm doing its...

Hi everybody! I have a question regarding FFT. I'm working with radar data & matlab. I have a block of data of 512 samples and I'm doing its FFT, but I want to do the same with exactly the same block of data but in blocks of 64 samples each, so I should do 8 FFTs right? What I don't know is how to merge those 8 FFTs afterwards, to be able to compare the two methods, that is, the FFT of 512...


Pulse compression implemented by the convolution vs. by fft

Started by tsuyahog in comp.dsp3 years ago 8 replies

Hi there! I'm working on Pulse compression for radar signal using FFT, the echo is N points, and the length of match filter is also N points, then...

Hi there! I'm working on Pulse compression for radar signal using FFT, the echo is N points, and the length of match filter is also N points, then I use N points FFT to calculate the pulse compression result, it seems that I can indeed get the right result. I just get a little confused, since two N-points signals for linear convolution needs L(L> =2N-1) points FFT to get the right thing. Is there