Using calibration files with Time Series data (TN-001)
From CSU-CHILL
Calibration files are saved each time the radar performs a self-calibration. These files are required when processing time series data in order to obtain the receiver gain, and to perform noise subtraction. This article describes a typical calibration file, and how to use it.
--Typical calibration file structure-- A calibration file is a flat ASCII file, containing several name-value pairs. Each name is a word with no white space within it, and is separated from the value by an '-' sign. An example is shown below:
noise_v_rx_1 = 40.647709 noise_h_rx_2 = 42.922058 noise_v_rx_2 = 41.802731 noise_h_rx_1 = 40.799435 ldr_bias_h_db = -0.453558 ldr_bias_v_db = -1.560466 gain_v_rx_1_db = 127.485725 gain_v_rx_2_db = 126.864494 gain_h_rx_1_db = 128.118271 gain_h_rx_2_db = 127.607368 zdr_cal_base_vhs = 1.250000 zdr_cal_base_vh = 1.100000 sun_pwr_v_rx_1_db = 24.056929 sun_pwr_h_rx_2_db = 23.603369 sun_pwr_v_rx_2_db = 23.007452 sun_pwr_h_rx_1_db = 24.567917 zdr_bias_db = -3.432875
The noise, sun power and gain parameters have four variants, measured with the V and H LNAs, and two different receive paths. This is due to the transfer switch used in the receiver RF section
