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| -rw-r--r-- | 08.-Passive-Radar.md | 2 |
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diff --git a/08.-Passive-Radar.md b/08.-Passive-Radar.md index c092866..8490c46 100644 --- a/08.-Passive-Radar.md +++ b/08.-Passive-Radar.md @@ -121,6 +121,8 @@ In the future we aim to have software enhancements that make understanding and v The bistatic range displayed on the KrakenSDR range-doppler graph is described by the formula $\mathrm{Bistatic Range (meters)} = R_b = R_{tx} + R_{rx} - L$. So you can see that a single reading on the range-doppler graph describes an ellipse of possible locations. +For drawing an ellipse we can then use the equation $2a = R_b + L = R_{tx} + R_{rx}$ + # Range Resolution Range resolution depends on the sampling bandwidth, which for the KrakenSDR and RTL-SDR tuners inside is 2.4 MHz. Therefore we achieve $\frac{c}{fs} = \frac{299792458}{2400000} = ~125m$ resolution per range cell on the graph (assuming the illuminating signal is at least 2.4 MHz as well). |