Ka Mita Pae Radar

2. He aha ke kumumanaʻo ana o ka mika pae radar?
Hoʻohana ka mika pae radar i kahi oscillator alapine kiʻekiʻe e like me ka mea hana microwave. Alakaʻi ʻia ka microwave i hana ʻia e ka mea hana i ka antenna radiation ma o kahi waveguide a laila hoʻokuʻu ʻia i lalo. Ke hālāwai ka microwave me kahi mea keakea, e like me ka ʻili wai, ua omo ʻia kekahi o ia mea a ua hoʻihoʻi ʻia kekahi. Ana ʻia ka pae wai ma ke ana ʻana i ka pilina ma waena o kekahi mau palena o ka nalu i hoʻouna ʻia a me ka nalu i hōʻike ʻia mai ka pae wai.

I kēia manawa, aia ʻelua ʻano nui o nā mika pae radar. Loaʻa i kekahi ʻano kahi alapine hoʻokuʻu paʻa a ana i ka manawa huakaʻi o ka nalu i hoʻokuʻu ʻia a me ka nalu i hōʻike ʻia. A laila, ma o kahi mea hana hōʻailona akamai, helu ia i ke kiʻekiʻe o ka pae wai i ana ʻia. ʻO ka pilina ma waena o ka manawa hana o kēia ʻano anakahi pae radar a me ka mamao mai ka pae wai: t = 2d/c.
c - Ka wikiwiki o ka laha ʻana o nā nalu electromagnetic, c = 300000 km/s;
d - Ka mamao ma waena o ka pae waena i ana ʻia a me ka probe, ma nā mika;
t - ʻO ka manawa mai ka wā e hoʻopuka ai ka probe i nā nalu electromagnetic a hiki i ka loaʻa ʻana o nā nalu electromagnetic i hōʻike ʻia, S.

ʻO ke ʻano ʻē aʻe ke ana i ka ʻokoʻa alapine (frequency) ma waena o ka nalu i hoʻopuka ʻia a me ka nalu i hōʻike ʻia, a hoʻololi i kēia ʻokoʻa alapine i kahi hōʻailona uila e kūlike ana i ka pae wai i ana ʻia. ʻAʻole ka alapine hoʻopuka o kēia ʻano ana pae wai he alapine paʻa akā he alapine hoʻololi mau i ka amplitude.