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Anything related to RADAR (RAdio Detection And Ranging) systems and radar signal processing.

1 vote

Why the ideal ambiguity function (AF) for radar has the maximum in (0, 0) and zero otherwise?

in practice as there will usually be some mismatch between the filter and signal: This is not usually desirable (if a target has any Doppler shift from an unknown velocity it will disappear from the radar
GrapefruitIsAwesome's user avatar
3 votes

Pulse Doppler Radar: how to filter its Range-Doppler matrix?

Two suggestions that may independently, or combined, help to solve your problem. Consider using a different window/weighting function for your FFT processing. There are window functions with low un …
GrapefruitIsAwesome's user avatar
3 votes

range-doppler map to range-velocity map conversion

In radar the relationship between range rate, $v$ and Doppler frequency offset, $\Delta f$ is given by: $$v = -\frac{c}{2} \frac{\Delta f}{f_c}$$ where $c$ is the speed of light and $f_c$ is the carrier … {f_d - f_c}{f_c}$$ The Doppler frequency offset is equal to the amount the Doppler frequency has been shifted from the carrier $\Delta f = f_c - f_d $: $$v_r = -c \frac{\Delta f}{f_c}$$ And, since in radar
GrapefruitIsAwesome's user avatar
1 vote

Probability of Detection and pulse-pulse decorrelation time

The following is based on the report from Peter Swerling: Probability of Detection for Fluctuating Targets. Case II is defined as fluctuations that are independent from pulse to pulse (page 2), that i …
GrapefruitIsAwesome's user avatar
1 vote

How does one go about choosing a Radar Cross Section for a human when modelling a Pulse micr...

As the radar cross-section (RCS) is a property of the scattering target you don't really get to choose it. 1 m2 (0 dBsm) is a typical reference RCS for stating radar system performance. … A typical value for a human in S-Band is somewhere between -5 and 0 dBsm (0.3 - 1.0 m2) based on figures in Computer Models of the Human Body Signature for Sensing Through the Wall Radar Applications. …
GrapefruitIsAwesome's user avatar
3 votes

How does the Hilbert Transform extract the in-phase and quadrature phase components of a rea...

First a definition: an analytic signal is one who's negative frequency components are zero. For a real signal $x(t)$, the Hilbert transform computes the imaginary component of the corresponding analyt …
GrapefruitIsAwesome's user avatar
1 vote

How does the error in azimuth angle vary as one moves away from the boresight direction of a...

This description assumes a planar phased array radar system. … Keeping all other factors constant, for a radar the SNR is inversely proportional to the fourth power of range, $r$ (see The Radar Range Equation): $$SNR(r) = SNR_0\cdot \left(\frac{r_0}{r}\right)^4$$ …
GrapefruitIsAwesome's user avatar
2 votes

SNR ratio in radar for stationary targets

For the third question, the following relationship, known as the "radar range equation" applies (ref: The Radar Equation): $$SNR = \frac{S}{N} = \frac{P_tG^2\lambda^2\sigma}{(4\pi)^3R^4kT_SB_nL}$$ where … Additional info: The Radar Range Equation …
GrapefruitIsAwesome's user avatar
1 vote

Minimal SNR to distinguish LFM target from noise at range doppler output

I'm not sure you're going to get good detection performance for your example at only 10 dB signal-to-noise ratio (SNR). Detection, in general, is a tradeoff between achieving a high probability of de …
GrapefruitIsAwesome's user avatar