Frequency ambiguity resolution

ambiguous velocityFrequency ambiguity resolution detailed explanationFrequency ambiguity resolution process explanation
Frequency ambiguity resolution is used to find true target velocity for medium pulse repetition frequency (PRF) radar systems.wikipedia
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Pulse-Doppler radar

Dopplerpulse-Dopplerpulse doppler
This is used with pulse-Doppler radar.
* Frequency ambiguity resolution detailed explanation

Pulse repetition frequency

PRFpulse repetition frequenciesmedium pulse repetition frequency
Frequency ambiguity resolution is used to find true target velocity for medium pulse repetition frequency (PRF) radar systems.
For example, an L-Band radar with 500 Hz pulse rate produces ambiguous velocity above 75 m/s (170 mile/hour), while detecting true range up to 300 km. This combination is appropriate for civilian aircraft radar and weather radar.

Modular arithmetic

The radial velocity measurements made in this way produce a modulo function of the true radial velocity.


aliasedaliastemporal aliasing
Radar pulsing causes a phenomenon called aliasing, which occurs when the Doppler frequency created by reflector motion exceeds the pulse repetition frequency (PRF).

Range ambiguity resolution

Range ambiguity resolution detailed explanationrange ambiguity resolution process
This concept is related to range ambiguity resolution.

Nyquist rate

Nyquist limitNyquist sampling rateNyquist
This limitation is called the Nyquist sampling rate.

Nyquist frequency

NyquistN/2 different frequenciesNyquist component
Frequency is folded for high speed targets where radial velocity produces a frequency shift above the Nyquist frequency.

Modulo operation

The true speed of the target may be folded by a modulo operation produced by the sampling process.


This could also be implemented as a convolution function, where the spectrum amplitudes from one PRF are applied to spectrum samples from the other PRF as a sliding window function.

Pulse-Doppler signal processing

Doppler CFAR detection processingPulse-Doppler signal processing detailed explanation
* Frequency ambiguity resolution process explanation

Ambiguity resolution

Ambiguity resolution detailed explanationAmbiguity resolution process explanation
The received signals are also compared using the frequency ambiguity resolution process.