Sir, you said detecting small object with a lower frequency incident wave. Howerver, in the rayleigh region, the RCS of object is always smaller than is real RCS. We want to obtain its real RCS. Why don't we detect it in optical region?
In radar systems, the phase information can be lost during post detector integration primarily due to the process of integration itself. Here's a detailed explanation: 1. **Detector Output**: After receiving and mixing the received radar signal with the local oscillator signal, the detector produces a signal that typically consists of an amplitude component and a phase component. 2. **Integration Process**: In many radar systems, especially in pulse-Doppler radar or coherent radar systems, integration is performed over multiple pulses or over a period of time to improve the signal-to-noise ratio (SNR) of the received signal. This integration involves summing up the detector outputs over time or pulses. 3. **Resultant Signal**: The integration process effectively combines the amplitudes of the signals received over time. However, when it comes to phase information: - **Phase Averaging**: During integration, the phases of the received signals from different pulses or time intervals are often random with respect to each other due to factors like Doppler shifts, target movements, etc. - **Cancellation Effects**: Phase components from different pulses can cancel each other out when integrated, especially if the phases are not aligned (coherent integration tries to mitigate this but has limits). 4. **Phase Coherence**: For coherent integration (which preserves phase information to some extent), there must be a stable relationship between the transmitted and received signals over the integration period. However, this coherence can be lost due to target movements, varying propagation conditions, etc. 5. **Non-coherent Integration**: In non-coherent integration, which is common in radar systems where phase information is not preserved, only the amplitudes of the received signals are integrated. This is simpler and more robust in terms of maintaining signal reliability but at the cost of losing phase information. 6. **Signal Processing Considerations**: Many radar signal processing techniques, such as pulse compression or Doppler processing, rely on amplitude information rather than phase. Therefore, in practical radar systems, the emphasis is often on preserving amplitude information through integration rather than phase. In summary, the loss of phase information during post detector integration in radar systems occurs due to the random nature of phase relationships between signals received over time or pulses, and the emphasis on integrating amplitude signals for improved SNR rather than preserving phase coherence.
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Sir, you said detecting small object with a lower frequency incident wave. Howerver, in the rayleigh region, the RCS of object is always smaller than is real RCS. We want to obtain its real RCS. Why don't we detect it in optical region?
Optical region have very short wavelength
Sir why is phase info lost in post detector integration can you please elaborate
In radar systems, the phase information can be lost during post detector integration primarily due to the process of integration itself. Here's a detailed explanation:
1. **Detector Output**: After receiving and mixing the received radar signal with the local oscillator signal, the detector produces a signal that typically consists of an amplitude component and a phase component.
2. **Integration Process**: In many radar systems, especially in pulse-Doppler radar or coherent radar systems, integration is performed over multiple pulses or over a period of time to improve the signal-to-noise ratio (SNR) of the received signal. This integration involves summing up the detector outputs over time or pulses.
3. **Resultant Signal**: The integration process effectively combines the amplitudes of the signals received over time. However, when it comes to phase information:
- **Phase Averaging**: During integration, the phases of the received signals from different pulses or time intervals are often random with respect to each other due to factors like Doppler shifts, target movements, etc.
- **Cancellation Effects**: Phase components from different pulses can cancel each other out when integrated, especially if the phases are not aligned (coherent integration tries to mitigate this but has limits).
4. **Phase Coherence**: For coherent integration (which preserves phase information to some extent), there must be a stable relationship between the transmitted and received signals over the integration period. However, this coherence can be lost due to target movements, varying propagation conditions, etc.
5. **Non-coherent Integration**: In non-coherent integration, which is common in radar systems where phase information is not preserved, only the amplitudes of the received signals are integrated. This is simpler and more robust in terms of maintaining signal reliability but at the cost of losing phase information.
6. **Signal Processing Considerations**: Many radar signal processing techniques, such as pulse compression or Doppler processing, rely on amplitude information rather than phase. Therefore, in practical radar systems, the emphasis is often on preserving amplitude information through integration rather than phase.
In summary, the loss of phase information during post detector integration in radar systems occurs due to the random nature of phase relationships between signals received over time or pulses, and the emphasis on integrating amplitude signals for improved SNR rather than preserving phase coherence.
Sir you said it can't detect drones but in resonance region you gave an example of drone..
detection of drones is difficult due to their small size and shape.
@@EngineeringFunda means they can be detected? But with difficulty??!!
Kindly upload satellite communication
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