Chapter 7 Radar and Sensor Systems

Radar (RAdio Detection And Ranging)

 

7.1 Introduction and Classifications

1) Radar block diagram

Target and RCS (radar cross section)

Electromagnetic wave propagation

Antenna and antenna array (passive or active electronic beam scanning)

T/R (transmit/receive) module

Radar waveform design

Digital receiver

Signal processing

Data processing

 

2) Radar classification

- By range: short-range, medium-range, long-range, over-the-horizon

- By platform: ground, shipboard, airborne, satellite-borne, on board the spacecraft

- By application sector: civilian, military

 

7.2 Radar Equation

 

 

 

 

 

7.3 Radar Equation Including Pulse Integration and System Losses

 

 

Lsys: system loss

 

7.4 Radar Cross Section (RCS)

 

 

 

Stealth Aircraft RCS: 0.1 m2 max

 

https://upload.wikimedia.org/wikipedia/commons/b/be/USAF_B-2_Spirit.jpg B2  F-35  stealth aircraft에 ëŒ�í•œ 이미ì§� ê²�색결과 F-22

 

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/J-20_at_Airshow_China_2016.jpg/1280px-J-20_at_Airshow_China_2016.jpg J-20 https://upload.wikimedia.org/wikipedia/commons/4/45/Sukhoi_T-50_Maksimov.jpg Sukhoi PAK FA

 

 

 

7.5 Pulse Radar

 

 

 

 

 

 

7.6 Continuous-Wave or Doppler Radar

- Detection of target speed only.

Figure: Homodyne CW Doppler radar

 

 

 

 

7.7 Frequency-Modulated Continuous-Wave (FMCW) Radar

- Detection of target distance and speed

 

 

 

 

7.8 Direction Finding and Tracking

- Omitted for graduate-level study