众文网1.急求关于雷达的外文及其翻译
The role of radar and eyes similar to, of course, it is no longer a masterpiece of nature, while its information carrier is radio. In fact, both visible light or radio waves, in essence the same thing, are electromagnetic waves, transmission speed is the speed of light C, the difference lies in their respective bands occupy different. The principle is that the radar equipment of the transmitter antenna to the electromagnetic energy through space shooting at a certain direction, in this direction encounter objects on the reflection of electromagnetic waves; radar antenna to receive the reflected waves, sent to the receiving device for processing, extracting information about the objects, some of the information (the distance between the object to the radar from the rate of change, or radial velocity, direction, height, etc.). Measuring the distance is a measure of the actual transmit pulse and the echo time difference between pulses due to the speed of light transmission of electromagnetic waves, whereby the precise target can be converted into the distance. Measure the target position is to use sharp antenna beam position measurement. Elevation measurements by a narrow beam angle of elevation measurements. According to elevation and distance will be able to calculate the target height. Radar speed measurement and objectives in accordance with their relative motion between the frequency generated by the Doppler effect principle. Radar target echo received by the firing frequency and radar frequency is different from the difference between the two is called Doppler frequency. Doppler frequency can be extracted from the main message is one of the distance between the radar and target rate of change. When the target and clutter interference exist in the same spatial resolution in the radar unit, the radar using the Doppler frequency difference between them from interfering with detection and tracking targets in clutter. Advantage of the radar can detect long-range goal of day and night, and without fog, clouds and rain to stop, with all-weather, all-time characteristics and a certain degree of penetration. Therefore, it not only became an essential military electronic equipment, and is widely used in socio-economic development (such as weather forecasting, resource exploration, environmental monitoring, etc.) and scientific research (celestial studies, atmospheric physics, ionospheric structure, etc.). Spaceborne and airborne synthetic aperture radar remote sensing has become very important in today's sensors. To the ground target radar can detect the exact shape of the ground. The spatial resolution of up to a few meters to tens of meters, and has nothing to do with the distance. Radar in flood monitoring, sea ice monitoring, soil moisture surveys, forest resource inventory, geological investigation has demonstrated a good potential for application.只有这些啦。
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