52 lines
1.8 KiB
Rust
52 lines
1.8 KiB
Rust
//! Writes the specific and zenith gaseous attenuation computed by this
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//! workspace, for cross-checking against ITU-R P.676-12.
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//!
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//! 写出本工作区计算的比与天顶气体衰减，用于对照 ITU-R P.676-12 交叉核对。
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//!
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//! Usage:
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//!
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//! ```text
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//! cargo run -p apsis-rs --features rf --example dump_gas \
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//! > validation/data/expected/rust_gas.csv
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//! ```
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//!
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//! 用法：
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//!
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//! 运行上方的命令即可得到该示例的输出。
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use apsis_atmosphere::{
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Atmosphere, equivalent_heights, specific_attenuation_dry_air, specific_attenuation_water_vapour,
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};
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/// The frequencies sampled, in gigahertz. They span the oxygen complex near
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/// 60 GHz, the water vapour lines at 22.235 and 183.31 GHz, and the windows
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/// between them.
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///
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/// 所采样的频率，单位为吉赫兹。它们跨越 60 GHz 附近的氧复合体、22.235 与
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/// 183.31 GHz 的水汽线，以及其间的窗口。
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const FREQUENCIES_GHZ: &[f64] = &[
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1.0, 2.0, 4.0, 6.0, 10.0, 12.0, 15.0, 20.0, 22.235, 30.0, 40.0, 50.0, 60.0, 70.0, 100.0, 118.0,
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183.0, 300.0,
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];
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fn main() {
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println!("frequency_ghz,dry_db_per_km,wet_db_per_km,dry_height_km,wet_height_km,zenith_db");
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let atmosphere = Atmosphere::REFERENCE;
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for &frequency in FREQUENCIES_GHZ {
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let Some(dry) = specific_attenuation_dry_air(frequency, atmosphere) else {
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continue;
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};
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let Some(wet) = specific_attenuation_water_vapour(frequency, atmosphere) else {
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continue;
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};
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let Some(heights) = equivalent_heights(frequency, atmosphere) else {
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continue;
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};
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let zenith = dry * heights.dry_km + wet * heights.wet_km;
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println!(
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"{frequency},{dry:.12},{wet:.12},{:.9},{:.9},{zenith:.12}",
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heights.dry_km, heights.wet_km
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);
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}
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}
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