至尊木虫 (知名作家)
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【答案】应助回帖
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沧海逍遥: 金币+50, 翻译EPI+1, ★★★★★最佳答案 2015-06-12 08:32:22
The echo signal from the target is very weak and submerged in the background clutter and noise due to the transmit power limit and wall attenuation. The power of the echo signal can be enhanced by increasing pulse repetition frequency or transmitting a uniformly spaced pulse train. However, increase in pulse repetition frequency will cause a decrease in the unambiguous detection distance. In addition, if a uniformly spaced pulse train is transmitted, the energy will be concentrated at discrete harmonic frequencies within the total bandwidth, which will reduce the distance resolution of the radar. If the pulse trains are modulated by the random signal, the generated noise-like signal as the probe signal can solve the above mentioned problems.
难道后面有句话是用虚拟语气？如果用则后面的都用，其实不需要（我给改了） |
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