Fig. 4 | Nature Communications

Fig. 4

From: Partially coherent radar unties range resolution from bandwidth limitations

Fig. 4

Experimental implementation and transmitted bandwidth measurements. a Photograph of the partially coherent oscillator implementation. A carrier is split into two quadratures, where one arm is phase delayed by 90°. Each arm is multiplied by an appropriate sine or cosine term of the desired random phase output at time t, and the two arms are combined together to reveal a single carrier with the desired phase jumps, implementing and IQ vector modulator. b Measured half-bandwidth of the radar as it sweeps from coherence length of 22–27 m, corresponding to transmitted bandwidths of between 27.2 and 22 MHz. The peaks of the “sinc” function are lowered with increasing bandwidth, conserving the transmitted power throughout the sweep. These signals were used to explore the scenarios shown in Fig. 5a

Back to article page