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What is slow time and fast time?
Fast-time corresponds to a small-scale time measurement of radar data at each pulse; slow-time is a (typically) much larger time scale, and corresponds to the dimension where each pulse was sent out.
What is fast time in radar?
Radar processing can occur over N consecutive pulses, as long as they lie within the coherent processing interval, considered “slow” time. The L radar samples collected during the pulse repetition frequency (PRF) interval are binned, which corresponds to the range. The PRF interval is referred to as “fast” time.
How does radar signal processing work?
The signal processor is that part of the system which separates targets from clutter on the basis of Doppler content and amplitude characteristics. In modern radar sets the conversion of radar signals to digital form is typically accomplished after IF amplification and phase sensitive detection.
How is Fourier transform used in radar?
When it comes to radar, the FFT (Fast-Fourier Transform) is used to convert time domain signals into frequencies. An example of its use is for converting the dual channels of a pulse-Doppler radar from time domain into range-Doppler data.
How do you overcome range ambiguity?
Range ambiguities are resolved and the true range is found by transmitting three separate waveforms, each at a different prf….Related terms:
- High Pulse Repetition Frequency.
- Pulse Repetition Frequency.
- Pulse Doppler Radar.
- Time-of-Flight.
- Waveform.
- Wavelength.
- Optical Frequency.
- Repetition Rate.
How do you resolve range ambiguity?
Range ambiguity resolution is a technique used with medium Pulse repetition frequency (PRF) radar to obtain range information for distances that exceed the distance between transmit pulses. This signal processing technique is required with pulse-Doppler radar.
What do u mean by signal processing?
Signal processing is an electrical engineering subfield that focuses on analysing, modifying, and synthesizing signals such as sound, images, and scientific measurements.
Which transform is used in radar system?
Fourier- transformation
The Fourier- transformation has become a fundamental method in the signal processing procedures, since the radar echo contains a variety of informations in the signal form. This information is convicted by the Fourier- transformation into a data format which can be used by the computer-aided signal processing.
What is the purpose of the ambiguity function?
The ambiguity function, which is denoted as. FW f, , is primarily used to gain an understanding of how a signal processor responds, or reacts, to a given returned signal. As indicated in the notation, the independent variables of the ambiguity function are time (.
Is it fast time or slow time for the delay in the delay?
This means that, like you said before, we have two time dimensions: fast-time and slow-time. Fast-time corresponds to a small-scale time measurement of radar data at each pulse; slow-time is a (typically) much larger time scale, and corresponds to the dimension where each pulse was sent out.
What is the ambiguity function in FMCW radar?
The Ambiguity Function is just a name for 2D Correlator. It is known that given a shifted 1D Signal the optimal estimator for the shift (Range in RADAR / LIDAR, etc…) it the correlation with the signal. What if our signal had 2 parameters and both are shifted?
What is the ambiguity function in Doppler processing?
The ambiguity function is a measurement of Doppler speed and range/time. The range-Doppler map (RDM) from pulse-Doppler processing is a measurement of… Doppler speed and range/time! There are two types of ambiguity functions: single pulse, and multi-pulse.