The primary function of the radar receiver is to detect desired echo signals amidst various challenges such as noise, interference, or clutter. A radar receiver typically consists of four main functional blocks:
- The amplification block increases the amplitude of the incoming signal to levels that are usable in subsequent stages of the receiver.
Band-Select Filter Block
- This block is responsible for rejecting out-of-band interference, ensuring that only signals within the desired frequency range are processed further.
Matched Filter Block
- The matched filter block shapes both signals and noise to maximize the signal-to-noise ratio. It is crucial for efficient signal detection in the presence of noise.
- The demodulation block performs the removal of the carrier and translates the signal to its information frequencies or baseband. This step is essential for extracting meaningful information from the received signal.
The superheterodyne receiver is the most widely used type in radar systems. In a superheterodyne receiver:
- Signals are offset downward by a local oscillator.
- Amplification and filtering occur at a lower frequency or intermediate frequency (IF).
- This design provides advantages such as good sensitivity, high gain selectivity, and reliability.
The superheterodyne architecture enhances the overall performance of the radar receiver by effectively addressing challenges associated with interference and noise. Its popularity is attributed to its ability to provide robust and reliable signal processing in radar applications.