| 摘要 |
<p>A line scanning apparatus includes a cylindrical housing which holds a spin mirror (4), a detector array (8), a multiplexer assembly (34), an analog-to-digital converter (54), a shaft encoder (60), digital processing apparatus and memory storage devices (66). Inertial navigation system (INS) reference information, including velocity-to-height ratio data is provided from the inertial navigation system of the aircraft or other appropriate sensors. The line scanning apparatus further includes optics for focusing radiation which is reflected into the optics by the spin mirror which is inclined at about a 45 DEG angle to the optical axis. The detector array comprises a plurality of radiation detector cells which provide a plurality of synchronously sampled signals representative of the amount of radiation impinging on the detector array at any given time. The spin mirror is attached to a spin mirror motor which is further attached to the shaft encoder. The shaft encoder provides positional data to the digital processing apparatus wherein the positional data represents the spin mirror orientation correlated to a particular period in time. The memory device stores the radiation signals and the synchronous positional data further comprised of array displacement coordinate information which is synchronously correlated to the digital radiation signals. An address control device is arranged to load data into a frame buffer for correction of time delays resulting from the apparent array rotation by compensating for the time delays for applying the displacement information to the corresponding sampled signal. An approximately constant along track swath width per scan results and more readily interpreted imagery results thereby. <IMAGE></p> |
