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INTRODUCTION
The radar systems have been changing on the account of the requirements caused by:- Increase in the number of wanted and unwanted targets. Reduction in target size. Need to adapt a greater no. of electronic counter measures.
CATEGORIES OF RADAR
Two Categories:-
1. Single-function radars.
2. Multi function radar (passive phased array).
SINGLE FUNCTION RADAR
Has fixed antenna with centralized transmitters.
Eg:1) Surveillance radar
2) Tracking radar
MULTI-FUNCTION RADAR
Passive phased array:- use phase shifters, switching elements. Carry out more than one function.

ADAPTIVE ACTIVE PHASED-ARRAY RADAR
Power is radiated directly into space with minimum loss. Pure detection performance. Reducing power consumption costs
.
ADAPTIVE RADAR FEATURES
1. Digital beam forming
2.Waveform generation and selection
3. Beam management
4. Frequency selection
5. Task scheduling
6. Tracking
OPERATIONAL REQUIREMENTS
Principal functions :-
Volume surveillance
Target detection and confirmation
Target tracking
Target identification
Target trajectory or impact point calculation
Tracking of ECM emissions
Kill assessment
Missile and other communications
VOLUME SURVEILLANCE
By the management of radar waveforms and beams:-
Energy usage is optimizes.
The probability of target determination is maximized
DETECTION AND CONFIRMATION
A look back beam using the position data.This significantly reducing the track confirmation delay.
CONCLUSION
AAPAR can provide many benefit required for tomorrowâ„¢s radar systems. Provides the radar system designer with an almost infinite range of possibilities. Breaks down the conventional walls between the traditional systems elements. It is multifunction radars systems. Use all the available RF power and to minimize RF losses.