# 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.

### Aliasing

**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).

### 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

**modulomodmodulus**

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

### Convolution

**convolvedconvolvingkernel**

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.