Radar Receiver Minimum Signal Calculation
Question:
What is the minimum receivable signal in a radar receiver which has an IF bandwidth of 25 MHz and a 9 dB noise figure? (Take T = 290 K)
What is the minimum receivable signal in a radar receiver which has an IF bandwidth of 25 MHz and a 9 dB noise figure? (Take T = 290 K)
Step 1: Convert Noise Figure
F = 10^(NF/10) = 10^(9/10) ≈ 7.94
Step 2: Use Formula
P = kTB × F
Where:
- k = 1.38 × 10-23
- T = 290 K
- B = 25 × 106 Hz
Step 3: Calculation
kT = 1.38 × 10^-23 × 290 = 4.002 × 10^-21
kTB = 4.002 × 10^-21 × 25 × 10^6 = 1.0005 × 10^-13
P = 1.0005 × 10^-13 × 7.94 = 7.94 × 10^-13 W
Final Answer:
P ≈ 7.9 × 10-13 Watts
P ≈ 7.9 × 10-13 Watts