Abstract: There is provided a dual-frequency LIDAR system for determining a distance and velocity of a target and a method of operating the same. The system includes tunable lasers operable to generate a first signal, a second signal, and a third signal having a phase noise below the phase of the first signal. The system includes at least one coupler operable to: couple the first and second signal for directing a transmission signal on the target, couple a backscattered signal and the third signal to obtain a received signal, and couple the transmission signal and the third signal to obtain a reference signal. Digital processing techniques are used to determine the distance of the target by estimating a time delay between the transmission and reference signals via cross-correlation. The velocity is obtained by estimating a Doppler-frequency shift based on the time delay, the received signal and the transmission signal.

Abstract: A transceiver for a phased array antenna comprises a laser light source arranged to provide an optical spectrum comprising a plurality of spaced wavelengths. The transceiver further comprises a dispersion unit arranged to introduce a delay to a plurality of spectral components of the optical spectrum associated with the spaced wavelengths. The delay is dependent on the wavelength of the spectral components of the optical spectrum. The transceiver further comprises a first optical filter configured to select a plurality of spectral components received from the dispersion unit. The transceiver further comprises a first heterodyning device configured to generate a signal for transmission by the phased array antenna by heterodyning the selected spectral components associated with different ones of the spaced wavelengths of the laser light source. The transceiver is configured to receive signals from the phased array antenna.

Abstract: A transceiver for a phased array antenna comprises a laser light source arranged to provide an optical spectrum comprising a plurality of spaced wavelengths. The transceiver further comprises a dispersion unit arranged to introduce a delay to a plurality of spectral components of the optical spectrum associated with the spaced wavelengths. The delay is dependent on the wavelength of the spectral components of the optical spectrum. The transceiver further comprises a first optical filter configured to select a plurality of spectral components received from the dispersion unit. The transceiver further comprises a first heterodyning device configured to generate a signal for transmission by the phased array antenna by heterodyning the selected spectral components associated with different ones of the spaced wavelengths of the laser light source. The transceiver is configured to receive signals from the phased array antenna.