阅读说明：本技术 一种卫星通信导航信号生成方法、装置及接收方法、装置 (Satellite communication navigation signal generation method and device and satellite communication navigation signal receiving method and device ) 是由 康家方 王红星 刘传辉 陆发平 于 2019-02-19 设计创作，主要内容包括：一种基于扩频码时移位置调制的卫星通信导航信号生成方法,包括：生成导频信号分量扩频码和数据信号分量扩频码(110)；根据导频信号分量扩频码,调制生成导频分量扩频调制信号S<Sub>pilot</Sub>(t)(120)；根据数据信号分量扩频码,采用扩频码时移为止调制的方式对二进制的电文或数据信息进行调制,生成数据分量扩频调制信号S<Sub>data</Sub>(t)(130)；采用中心频率为f<Sub>c</Sub>、相位不相同的载波,将导频分量扩频调制信号S<Sub>pilot</Sub>(t)和数据分量扩频调制信号S<Sub>data</Sub>(t)调制到射频,得到两路射频分量信号,再将两路射频信号分量叠加,得到射频调制信号S<Sub>RF</Sub>(t)(140)。还涉及一种卫星通信导航信号接收方法、生成装置、接收装置。(A satellite communication navigation signal generation method based on spread spectrum code time shift position modulation comprises the following steps: generating a pilot signal component spreading code and a data signal component spreading code (110); modulating and generating a pilot component spread spectrum modulation signal S according to the pilot signal component spread spectrum code pilot (t) (120); according to the data signal component spread spectrum code, adopting the mode of modulating the spread spectrum code until time shifting to modulate binary text or data information to generate data component spread spectrum modulation signal S data (t) (130); using a centre frequency of f c Carrier waves with different phases, spread spectrum modulating signal S with pilot frequency component pilot (t) and data component spread spectrum modulated signal S data (t) modulating to radio frequency to obtain two radio frequency component signals, and superposing the two radio frequency component signals to obtain a radio frequency modulation signal S RF (t) (140). The invention also relates to a satellite communication navigation signal receiving method, a generating device and a receiving device.)

A satellite communication navigation signal generation method, comprising:

generating a pilot signal component spreading code and a data signal component spreading code;

modulating and generating a pilot component spread spectrum modulation signal S according to the pilot signal component spread spectrum code_pilot(t)；

According to the data signal component spread spectrum code, adopting spread spectrum code time-shifting position modulation mode to modulate binary telegraph text or data information to generate data component spread spectrum modulation signal S_data(t), the spreading code time shift position modulation means: according to the difference of the pre-modulated binary text or data information, the data component spread spectrum code sequence is in the position code element time interval T_sThe minimum time interval of the shift is 1 spreading code chip period T_c，T_sSpreading code period T with pilot signal component_pilotThe corresponding relation is as follows: t is_s＝k×T_pilot，k>0；

Using a centre frequency of f_cCarrier waves with different phases, spread spectrum modulating signal S by the pilot frequency component_pilot(t) and data component spread spectrum modulated signal S_data(t) modulating to radio frequency to obtain two radio frequency component signals, and superposing the two radio frequency component signals to obtain a radio frequency modulation signal S_RF(t)。

The method of generating a satellite communication navigation signal of claim 1, wherein T is the length N of the spreading code sequence in the data signal component_s＝N×T_cTime-shifted position modulation method using spread spectrum code for data signal componentThe method comprises the following steps: cyclic code shift keying modulation method.

The method of claim 2, wherein the cyclic shift generates N different sets of spreading code time shift sequences for the spreading code sequence of length N in the data signal component, and the spreading code time shift position modulation method used for the data signal component is: selecting K spread spectrum code time shift sequence sets to modulate log in N spread spectrum code time shift sequence sets₂K bits of text or data information, K is less than or equal to N.

The method of generating a satellite communication navigation signal according to claim 1, wherein the data signal component is modulated by a spreading code time-shift position by: spread spectrum code time shift position modulation;

the spreading code time shift position modulation means: for length of NxT_cSpreading code sequence of (2), position symbol time interval T_s＞(N+1)×T_cSpreading code sequences in time intervals T, depending on the text or data information of the premodulated binary_sInternal direct shift, containing a total of M ═ T_s/T_cN +1 different positions, modulation log₂M bits of text or data information.

A satellite communication navigation signal receiving method that receives a signal generated by the generation method according to any one of claims 1 to 4, comprising:

generating a spreading code local reproduction code of the pilot signal component and the data signal component;

receiving a radio frequency modulated signal S via an antenna_RF(t) using a center frequency of f_cTwo carriers with 90-degree phase difference, and modulating the radio frequency modulation signal S_RF(t) down-converting to a baseband to obtain a received baseband signal;

capturing and tracking the received baseband signal by using a spreading code local reproduction code of a pilot signal component, extracting clock information of the pilot signal according to a capturing and tracking result, and obtaining the clock information of the pilot signal according to a relation T_s＝k×T_pilotDetermining a time shift modulation interval for each symbol data signal component;

performing correlation operation on the receiving baseband signal by using a spreading code local recurrence code of a data signal component to obtain a correlated signal sequence to be detected;

and comparing the sequence value of the signal to be detected, taking the moment corresponding to the maximum value as the position detection moment, and judging the position detection moment to obtain binary telegraph text or data information according to the mapping relation between the binary data and the displacement of the spread spectrum code sequence in the modulation process.

A satellite communication navigation signal generating apparatus, comprising:

a spread spectrum code generating module for generating a pilot signal component spread spectrum code and a data signal component spread spectrum code;

a pilot signal component modulation module for generating a pilot component spread spectrum modulation signal S according to the pilot signal component spread spectrum code_pilot(t)；

A spread spectrum code time shift position modulation module for modulating binary text or data information by adopting a spread spectrum code time shift position modulation mode according to a data signal component spread spectrum code to generate a data component spread spectrum modulation signal S_data(t), the spreading code time shift position modulation means: according to the difference of the pre-modulated binary text or data information, the data component spread spectrum code sequence is in the position code element time interval T_sThe minimum time interval of the shift is 1 spreading code chip period T_c，T_sSpreading code period T with pilot signal component_pilotThe corresponding relation is as follows: t is_s＝k×T_pilot，k>0；

An up-conversion module for generating a center frequency of f_cDifferent phase carrier wave, and spread spectrum modulating signal S with pilot frequency component_pilot(t) and data component spread spectrum modulated signal S_data(t) modulating to radio frequency to obtain two radio frequency component signals, and superposing the two radio frequency component signals to obtain a radio frequency modulation signal S_RF(t)。

The satellite communication navigation signal generation apparatus of claim 6, wherein the spreading code time shift position modulation module is a spreading code cyclic shift keying modulation module, and for a spreading code sequence of length N in the data signal component, T_s＝N×T_cThe spread spectrum code cyclic shift keying modulation module modulates binary telegraph text or data information by adopting a cyclic code shift keying modulation method.

The satellite communications navigation signal generation apparatus of claim 7, wherein for a spreading code sequence of length N in the data signal component, the cyclic shift produces N different sets of spreading code time-shifted sequences, and wherein the spreading code cyclic shift keying modulation module is specifically configured to select K sets of spreading code time-shifted sequences to modulate log in the N sets of spreading code time-shifted sequences₂K bits of text or data information, K is less than or equal to N.

The satellite communication navigation signal generation apparatus of claim 6, wherein the spreading code time shift position modulation module is a spreading code time shift position modulation module for a length of nxt_cSpreading code sequence of (2), position symbol time interval T_s＞(N+1)×T_cAccording to the difference of the pre-modulation binary text or data information, the spread spectrum code sequence is directly shifted in the time interval Ts, and the spread spectrum code sequence totally contains M ═ T_s/T_cN +1 different positions, modulation log₂M bits of text or data information.

A satellite communication navigation signal receiving apparatus that receives a signal generated by the generating apparatus according to any one of claims 6 to 9, comprising:

a spread spectrum code local reproduction code generation module for generating a spread spectrum code local reproduction code of the pilot signal component and the data signal component;

a down-conversion module for generating a local carrier signal and modulating the received RF signal S via an antenna_RF(t) down-converting to baseband to obtainTo receive a baseband signal, said local carrier signal comprising a center frequency f_cTwo carriers with 90-degree phase difference;

a pilot signal capturing and tracking module for capturing and tracking the receiving baseband signal by using the spread spectrum code local recurrence code of the pilot signal component, extracting the clock information of the pilot signal according to the capturing and tracking result, and according to the relation T_s＝k×T_pilotDetermining a time shift modulation interval for each symbol data signal component;

and the spread spectrum code time-shifting position demodulation module is used for carrying out correlation operation on the received baseband signal by using a local reproduction code of a spread spectrum code of a data signal component to obtain a correlated signal sequence to be detected, comparing the sequence value of the signal to be detected in a time-shifting modulation interval, taking the moment corresponding to the maximum value as a position detection moment, and judging the position detection moment to obtain binary text or data information according to the mapping relation of the displacement of binary data and a spread spectrum code sequence in the modulation process.