本文讨论了高超声速粘性激波层方程数值计算时差分格式引起的物理失真问题。

The problems of physical distortion due to the finite-difference scheme are studied in numerical solutions of the hypersonic viscous shock-layer equations.

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从三星时差定位的原理出发，构建定位方程组，推导理论定位精度公式，详细分析各种星座布局对定位的影响。

Basing on the basic principle of tri-satellites geo-location using TDOA, theory location precision equation is developed and infection of various constellation shape are analyzed in detail.

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