# Questions tagged [linear-chirp]

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### Chirp after T seconds

Suppose we have this signal from this wiki page $a(t)=\sin(\varphi_o + f_0t + (f_1-f_0)t^2/T)$ The article tells that T is a period of chirp modulation in which frequency changes. So my question is ...
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### Need help with detecting onset of audio in wav file

I'm new to DSP and I'm learning as I go. I have an audio file with a chirp signal(2kHz). I played and recorded this chirp signal and the recording has a lot of environmental sounds. Here is my code:
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### Chirp resolution as a function of bandwidth

My question concerns about the Chirp resolution during the crosscorrelation as a function of the sampling rate and available bandwidth. Suppose at a transmitter a chirp signal is transmitted (ranging ...
So I have a digital linear chirp signal: $$x[n] = \sqrt{\frac{2}{N}} \cdot \cos\Big( 2 \pi \frac{f_{0}}{f_{s}}n + \pi \frac{B}{N} n^{2}\Big)$$ Where $f_{0}$ is the initial frequency, $f_{s}$ is ...
I am computing the link budget for a communication-radar (CoRadar) system. The formula for maximum distance, in communication, is: $d_{max} = \sqrt{\frac{P_t}{\tau}\frac{G_t G_{r, comm} \lambda^2}{(4\... 0 votes 1 answer 81 views ### finding the audio pulse compression peak in extra-low SNR scenario? I just want to obtain some general ideas for such a scenario: if the environmental noise is extremely strong and the audio signal at the receiver is extremely weak(for instance, low range propagation),... 0 votes 1 answer 783 views ### matched filter of chirp signals In simulating linear frequency modulated (LFM) chirp signals, with the parameters: Pulse width, bandwidth. I find the matched filter response to be this: In particular, there is a increase in the ... 0 votes 0 answers 280 views ### Spectrum of received signal from radar fm-cw I obtained actual data from a researcher, consisting of a matrix composed of several received signals from an up-ramp fm-cw radar. Wouldn't be reasonable to plot the spectrogram of a ramp up and ... 1 vote 1 answer 9k views ### What is meant by LFM (Linear Frequency Modulation) waveform? I m a newbie in radar experiment on which currently i m working, and I m trying to understand the transmitted waveform which is LFM (Linear Frequency Modulation), but unable to interlink between the ... 0 votes 1 answer 1k views ### chirp signal - Frequency spectrum characteristics I am confused with my own intuition of the frequency response of a chirp signal. In this case, the chirp signal is a frequency modulated signal with initial frequency starting at 100 Hz and ending at ... 4 votes 3 answers 1k views ### Matched filter loss due to frequency offset I'm working with a pulsed radar signal which uses linear chirp pulses. I perform pulse compression by applying a matched filter of the simulated chirp waveform and recording the location and power of ... 1 vote 2 answers 307 views ### Decoupling two signals where one is a delayed version of the other I have a signal$y(t)$that consists of the sum of two signals where one is a time delayed version of the other.$ y(t) = x(t) + x(t-t_{d}) x(t)$is known but the time delay$t_d$is not. I ... 5 votes 4 answers 7k views ### Pulse Compression(Chirp) SNR Gain I've created both single tone signal and a LFM chirp signal with same pulse duration and cross correlated both of them with their own(matched filter). Peak points of both results were same as expected ... 0 votes 2 answers 513 views ### how fast can you sweep sinewave I am asking specifically about discrete sound signal, non dithered 16 bit 48000 Hz pcm/wav format. My question is, how fast can you change sinewave frequency before it distort? Imagine a frequency ... 3 votes 2 answers 1k views ### The frequency response function (FRF) fails to detect the antiresonance of a system I am trying to identify a vibrational systems by computing the frequency response function (FRF) of the system when a chirp signal is applied to its input. After comparing the FRF computed and the ... 4 votes 2 answers 3k views ### Can anyone explain how does CZT (Chirp Z Transform) really help in 'spectral zooming'? I found some explanation alongwith the Matlab Code here, but I can't figure out, without a good example, why would this result in spectral zooming? (or develop some time intuition like viewing it as ... 0 votes 1 answer 751 views ### FMCW SAR chirp return from target modelling I have to Model a chirp signal that was return from a Distance D from target and then multiply with the reference transmitted signal. Which will give me beat frequency signal and then fft to get the ... 2 votes 1 answer 3k views ### Basic question about chirp signal Suppose I generate chirp signal with the following python code: ... 0 votes 2 answers 2k views ### Spectrogram of a chirp and its FFT This question follows from an answer to this other question: Conceptual question on FFT and chirp signal I wrote a code starting from the spectrogram to compare it with the FFT result. ... 3 votes 3 answers 11k views ### Conceptual question on FFT and chirp signal If I take the FFT of a sinusoid I will get a plot whit all the energy of the signal concentrated at the sinusoid frequency. But what happens if I have a signal in which the frequency keeps changing?(... 4 votes 1 answer 418 views ### "chirp" with arbitrary period Say you have a linear chirp, which is a bit like a sinusoid with a gradually increasing period, but instead of the linearly increasing period, could you pick an arbitrary value, like the red line in ... 4 votes 2 answers 952 views ### Finding linear chirp parameters from a low quality spectrogram, possibly with image processing techniques? tl;dr: What is a fast way to get the equation of this line? I have to extract the "line of best fit" from this data (shown below), and many others like it (so I need a robust method). It is a a ... 2 votes 2 answers 1k views ### How can the FFT be used for estimating linear chirp parameters? Consider a linear chirp signal, i.e.$f(t) = f_0 + kt$, where$f_0$is the starting frequency, and$k\$ is the chirp rate. After applying an FFT, how would I find the starting frequency and chirp rate? 