From a27c0af2d2e908eb22bfac87dacccfc98de7da16 Mon Sep 17 00:00:00 2001
From: krakenrf <78108016+krakenrf@users.noreply.github.com>
Date: Sun, 16 Oct 2022 00:25:00 +1300
Subject: Updated 08. Passive Radar (markdown)

---
 08.-Passive-Radar.md | 2 ++
 1 file changed, 2 insertions(+)

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).
 
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