说明：  Weil码是一种性能优良的测距码，将在GPS L1C等信号中使用。Weil码由勒让德序列生成，目前勒让德序列并没有较好的实时生成方法。
(Weil code is an excellent ranging code, it will be used in GPS L1C and other signals. Weil codes are generated from Legendre sequences, but there is no good real-time generation method for Legendre sequences.)