5 - Phased Array Antennas & Basic CW RADARs

Question 1

Two ways to move the Beam

Answer 1

1. Mechanically Steered Array (MSA)
2. Electronically Steered Arrat (ESA)
   
   • “Phased Array”

Question 2

Electronic Scanning

Answer 2

Pros:

• Beam can move instantaneously
• Fewer moving parts to break
• High Data Rates
• Instantaneous Beam Positioning
• No Mechanical Breakdown
• Increased Flexibility
  
  • “Multi-mode” operation
    
    • Fire Control
    • Air/Sea Search
  • Multi-target tracking

Cons:

• Lost efficiency at high angles off array boresight

Question 3

Basic Continuous Wave (CW) RADAR

Answer 3

• Continuously Transmits and Receives
• Requires Two antennas
• Cannot measure range
• Must have relative motion to detect
• Key component of this RADAR is the Mixer