A reference signal sending method, wherein the method comprises: obtaining a reference signal sequence, wherein the reference signal sequence comprises multiple bits and exclusive OR of every two bits separated by one bit in the multiple bits is 1; performing Gaussian Minimum Shift Keying GMSK modulation on the reference signal sequence; and sending the modulated reference signal sequence, wherein the reference signal sequence is at least one of the following sequences: a first reference signal sequence, a second reference signal sequence, a third reference signal sequence, or a fourth reference signal sequence, wherein the first reference signal sequence is a periodic sequence of a sequence 0, 0, 1, 1, the second reference signal sequence is a periodic sequence of a sequence 0, 1, 1, 0, the third reference signal sequence is a periodic sequence of a sequence 1, 0, 0, 1, and the fourth reference signal sequence is a periodic sequence of a sequence 1, 1, 0, 0, wherein the performing Gaussian Minimum Shift Keying GMSK modulation on the reference signal sequence comprises: inserting the reference signal sequence into a data bit, wherein the data bit includes K groups of segmented data bits; and performing GMSK modulation on the data bit into which the reference signal sequence is inserted, wherein before the obtaining a reference signal sequence, the method further comprises: obtaining a pseudo random bit sequence; and the obtaining a reference signal sequence comprises: obtaining N consecutive bits of the pseudo random bit sequence; and obtaining a sequence from one of the first, second, third and fourth reference signal sequences, wherein the sequence is identified by the N consecutive bits from the first reference signal sequence, the second reference signal sequence, the third reference signal sequence, and the fourth reference signal sequence, wherein N is greater than or equal to 1. obtaining a reference signal sequence, wherein the reference signal sequence comprises multiple bits and exclusive OR of every two bits separated by one bit in the multiple bits is 1; performing Gaussian Minimum Shift Keying GMSK modulation on the reference signal sequence; and sending the modulated reference signal sequence, wherein the reference signal sequence is at least one of the following sequences: a first reference signal sequence, a second reference signal sequence, a third reference signal sequence, or a fourth reference signal sequence, wherein the first reference signal sequence is a periodic sequence of a sequence 0, 0, 1, 1, the second reference signal sequence is a periodic sequence of a sequence 0, 1, 1, 0, the third reference signal sequence is a periodic sequence of a sequence 1, 0, 0, 1, and the fourth reference signal sequence is a periodic sequence of a sequence 1, 1, 0, 0, wherein the performing Gaussian Minimum Shift Keying GMSK modulation on the reference signal sequence comprises: inserting the reference signal sequence into a data bit, wherein the data bit includes K groups of segmented data bits; and performing GMSK modulation on the data bit into which the reference signal sequence is inserted, inserting the reference signal sequence into a data bit, wherein the data bit includes K groups of segmented data bits; and performing GMSK modulation on the data bit into which the reference signal sequence is inserted, wherein before the obtaining a reference signal sequence, the method further comprises: obtaining a pseudo random bit sequence; and the obtaining a reference signal sequence comprises: obtaining N consecutive bits of the pseudo random bit sequence; and obtaining a sequence from one of the first, second, third and fourth reference signal sequences, wherein the sequence is identified by the N consecutive bits from the first reference signal sequence, the second reference signal sequence, the third reference signal sequence, and the fourth reference signal sequence, wherein N is greater than or equal to 1. obtaining N consecutive bits of the pseudo random bit sequence; and obtaining a sequence from one of the first, second, third and fourth reference signal sequences, wherein the sequence is identified by the N consecutive bits from the first reference signal sequence, the second reference signal sequence, the third reference signal sequence, and the fourth reference signal sequence, wherein N is greater than or equal to 1.