Range gating

Figure 10. Range-velocity-to-track association with a range gate size of 0.5m and...

Figure 9. Scheme of overall experimental setup for range-gated imaging through diffuse... 

Figure 10. (A) Close-up side view of the target and water cell. (B) Results under direct frontal laser illumination without range gating. (C) Results of range gating.

Compared with passive radiometric techniques, the fluorosensor methods for phytoplankton have several attractive features which are unique. These include relative insensitivity to daylight or cloudiness, specifity of response to Chi, and the potential for depth profiling using range-gating techniques. On the other hand, they are sensitive to other factors such as energy transfer, water composition, algae species, and sediments [8, 9]. 

The three-frequency nonlinear heterodyne system can also be used for pulsed radar applications. The configuration is similar to that considered previously. Pulses are sent to the target and the maximum-likelihood test is used to determine whether the target is or is not present (reflected or scattered signal deemed present or absent). For a detailed treatment of conventional range-gated pulsed radar applications, the reader is referred to the book by Davenport and Root [7.74]. 

Simard JR, Roy G, Mathieu P, Larochelle V, McFee J, Ho J (2004) Standoff sensing of bioaerosols using intensified range-gated spectral analysis of laser-induced fluorescence. IEEE Trans Geosci Remote Sens 42 865... 

Only forNMR. Broadband over the whole of the H ftaquency range, gated on during C data aoquislllon only vrith a deoouplar rise time lees than 2 m/t... 

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