论文部分内容阅读
据Probe Research Inc. 的一篇市场研究报告报导,微波通信设备市售量增长缓慢的原因在于纤维光学。在距离为100英里以上的大长度、高密度的陆地通信网络中,纤维光学通信始终比微波通信更加经济实惠。纤维光学凭借公用的传输媒质替代微波无线传输,因此市售量的增长慢于军用微波设备。军用部分占整个微波设备市场的70％,其年增长率为18％,与此相比,商业民用部分的年增长率为11％。Probe Researct公司的报告预计,微波设备在民用和军用方面的销售量在1990年将达300亿美元。据该公司的Scoth
According to a Probe Research Inc. market research report, the slow growth in the market for microwave communication equipment is due to fiber optics. Fiber optic communications have always been more economical than microwave communications in large, high density landline networks over 100 miles away. Fiber optics replaced the microwave radio transmission with a common transmission medium, so the market volume grew slower than military microwave equipment. The military segment, which accounts for 70% of the entire microwave equipment market, has an annual growth rate of 18%, compared with an 11% annual increase in the commercial sector. Probe Researct’s report predicts that sales of microwave equipment in civilian and military applications will reach $ 30 billion in 1990. According to the company’s Scoth