Hull M L, Mote C D
Biotelemetry. 1974;1(4):182-92.
Measurement problems can be classified into instrumentation, data transmission and recording, and analysis. This paper focuses on the transmission of multichannel, high-volume, high-frequency, high-accuracy data. Boot-ski dynamometer and skier velocity anemometer data provide 13 channels of max. 8-mV signals requiring 8-microvolt resolution or 4.45-Newton dynamometer resolution. The data transmission system features durability, power consumption approx. 10 Watts, weight 4.54 kp, range greater than 3,500 m, frequency response 250 Hz, accuracy 1 per cent, temperature stability, dynamic range plus or minus 2 inches. The transducer signals are ampflified to plus or minus 10 V for the 100-kbps PCM system. Special AC amplifiers, driven by an amplitude-stabilized power oscillator, were designed for elimination of radio frequency interference (RFI), improved stability and high signal/noise. Sixteen words are sequentially sampled at 521/sec-13 data, 2 frame counters, and 1 sync. The ground station consists of the PCM decoder with real-time capability and an analog tape recorder. Data is subsequently buffered and formatted onto digital tape by mini-computer.
测量问题可分为仪器仪表、数据传输与记录以及分析。本文重点关注多通道、大容量、高频、高精度数据的传输。测功计和滑雪者速度风速计数据提供13个通道，最大8毫伏信号，要求8微伏分辨率或4.45牛顿测功计分辨率。数据传输系统具有耐用性，功耗约10瓦，重量4.54千克，传输距离大于3500米，频率响应250赫兹，精度1%，温度稳定性，动态范围正负2英寸。对于100千比特每秒的脉冲编码调制（PCM）系统，传感器信号被放大到正负10伏。由幅度稳定的功率振荡器驱动的特殊交流放大器，旨在消除射频干扰（RFI），提高稳定性和高信噪比。以521次/秒的频率顺序采样16个数据字——13个数据、2个帧计数器和1个同步信号。地面站由具有实时能力的PCM解码器和模拟磁带记录器组成。随后，数据由小型计算机缓冲并格式化到数字磁带上。
