CN104090282A - Method and device for capturing Doppler frequency shift and pseudo code phase of satellite signal - Google Patents

Abstract

The invention discloses a method and device for capturing the Doppler frequency shift and the pseudo code phase of a satellite signal and belongs to the field of communication. The method for capturing the Doppler frequency shift and the pseudo code phase of the satellite signal comprises the steps that a binary offset carrier (BOC) side peak signal of a first middle signal is eliminated through a carrier signal, so that a first accumulation signal is obtained; a BOC side peak signal of a second middle signal is eliminated through the carrier signal, so that a second accumulation signal is obtained; a non-coherent integration value is obtained according to the first accumulation signal and the second accumulation signal; if the non-coherent integration value is smaller than a preset threshold value, an obtained Doppler frequency shift and an obtained pseudo code phase are determined to serve as the Doppler frequency shift and the pseudo code phase of the satellite signal. By the adoption of the method and device for capturing the Doppler frequency shift and the pseudo code phase of the satellite signal, the precision of the captured Doppler frequency shift and the captured pseudo code phase of the satellite signal can be improved.

Description

A kind of Doppler shift of capturing satellite signal and the method for pseudo-code phase and device

Technical field

The present invention relates to the communications field, particularly a kind of Doppler shift of capturing satellite signal and the method for pseudo-code phase and device.

Background technology

In recent years, along with improving constantly of people's living standard, increasing people has produced strong dependence to the positional information of self and surrounding.Popularizing of satellite positioning tech, makes people can obtain more convenient, more in time, more accurately desired position information.According to statistics, in the information of using people, there is more than 80% information relevant with " position ".Based on this demand, there is at present the Chinese Big Dipper 2, GPS (the Global Positioning System of the U.S., GPS) and the satellite navigation system such as the Galileo of European Union (Galileo), this satellite navigation system all provides satellite positioning functions, and people via satellite navigational system position the position of self.

In satellite navigation system, people position the position of self by receiver.Receiver first gets Doppler shift and the pseudo-code phase of the satellite-signal of satellite, then receive signal, this reception signal is the mixed signal of multi-signal, and this reception signal at least comprises satellite-signal, according to the Doppler shift of the satellite-signal obtaining and pseudo-code phase, from receive signal, identify and extract satellite-signal, according to the satellite-signal extracting, position the position that obtains self, obtain user's position.

In recent years in new generation satellite navigation system, satellite adopts BOC (Binary-Offset-Carrier, binary offset carrier) modulation system is modulated satellite-signal, in the BOC signal obtaining after modulation, comprise the other peak-to-peak signal of BOC, the other peak-to-peak signal of this BOC affects Doppler shift and the pseudo-code phase precision of capturing satellite signal, causes the Doppler shift of current capturing satellite signal and the precision of pseudo-code phase lower.

Summary of the invention

In order to improve the Doppler shift of capturing satellite signal and the precision of pseudo-code phase, the invention provides a kind of Doppler shift of capturing satellite signal and the method for pseudo-code phase and device.Described technical scheme is as follows:

The Doppler shift of capturing satellite signal and a method for pseudo-code phase, described method comprises:

Receive signal, according to described reception signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal;

From default Doppler shift set, select a Doppler shift and select a pseudo-code phase from default pseudo-code phase set;

According to described Doppler shift and described pseudo-code phase, described the first intermediate-freuqncy signal is processed and obtained the first M signal, and described the second intermediate-freuqncy signal is processed and obtained the second M signal;

Obtain sub-carrier signal, the other peak-to-peak signal of binary offset carrier BOC of eliminating described the first M signal by described sub-carrier signal obtains the first cumulative signal;

The other peak-to-peak signal of BOC of eliminating described the second M signal by described sub-carrier signal obtains the second cumulative signal;

According to described the first cumulative signal and described the second cumulative signal, obtain non-coherent integration value;

If described non-coherent integration value is less than predetermined threshold value, determine Doppler shift and pseudo-code phase that described Doppler shift and described pseudo-code phase are the satellite-signal of finally catching.

The described other peak-to-peak signal of binary offset carrier BOC of eliminating described the first M signal by described sub-carrier signal obtains the first cumulative signal, comprising:

Obtain a N in the pseudo-code generation cycle the first M signal, duration corresponding to each the first M signal equates with the duration of square-wave signal in sub-carrier signal;

According to described sub-carrier signal, obtain described N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal;

First subsignal and second subsignal corresponding according to described each first M signal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal.

The first subsignal that described in described basis, each first M signal is corresponding and the second subsignal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal, comprising:

First subsignal and second subsignal corresponding according to described each first M signal, be calculated as follows out the first cumulative signal of the main peak that only comprises BOC signal;

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

In above-mentioned formula, R _finalbe the first cumulative signal, be i the first subsignal corresponding to the first M signal, be i the second subsignal corresponding to the first M signal.

The described other peak-to-peak signal of BOC of eliminating described the second M signal by described sub-carrier signal obtains the second cumulative signal, comprising:

Obtain a N in the pseudo-code generation cycle the second M signal, duration corresponding to each the second M signal equates with the duration of square-wave signal in sub-carrier signal;

According to described sub-carrier signal, obtain described corresponding the first subsignal and the second subsignal of each second M signal;

First subsignal and second subsignal corresponding according to described each second M signal, the other peak of eliminating BOC signal obtains only comprising the second cumulative signal of the main peak of BOC signal.

The Doppler shift of capturing satellite signal and a device for pseudo-code phase, described device comprises:

The first acquisition module, for reception signal, according to described reception signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal;

Select module, for selecting a Doppler shift from default Doppler shift set and select a pseudo-code phase from default pseudo-code phase set;

Processing module, for according to described Doppler shift and described pseudo-code phase, processes and obtains the first M signal described the first intermediate-freuqncy signal, and described the second intermediate-freuqncy signal is processed and obtained the second M signal;

The first cancellation module, for obtaining sub-carrier signal, the other peak-to-peak signal of binary offset carrier BOC of eliminating described the first M signal by described sub-carrier signal obtains the first cumulative signal;

The second cancellation module, obtains the second cumulative signal for eliminate the other peak-to-peak signal of BOC of described the second M signal by described sub-carrier signal;

The second acquisition module, for obtaining non-coherent integration value according to described the first cumulative signal and described the second cumulative signal;

Determination module, if be less than predetermined threshold value for described non-coherent integration value, determines Doppler shift and pseudo-code phase that described Doppler shift and described pseudo-code phase are the satellite-signal of finally catching.

Described the first cancellation module comprises:

The first acquiring unit, for obtaining a N in the pseudo-code generation cycle the first M signal, duration corresponding to each the first M signal equates with the duration of square-wave signal in sub-carrier signal;

Second acquisition unit, for according to described sub-carrier signal, obtains described N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal;

First eliminates unit, and for first subsignal and second subsignal corresponding according to described each first M signal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal.

Described first eliminates unit, for first subsignal and second subsignal corresponding according to described each first M signal, is calculated as follows out the first cumulative signal of the main peak that only comprises BOC signal;

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

In above-mentioned formula, R _finalbe the first cumulative signal, be i the first subsignal corresponding to the first M signal, be i the second subsignal corresponding to the first M signal.

Described the second cancellation module comprises:

The 3rd acquiring unit, for obtaining a N in the pseudo-code generation cycle the second M signal, duration corresponding to each the second M signal equates with the duration of square-wave signal in sub-carrier signal;

The 4th acquiring unit, for according to described sub-carrier signal, obtains described corresponding the first subsignal and the second subsignal of each second M signal;

Second eliminates unit, and for first subsignal and second subsignal corresponding according to described each second M signal, the other peak of eliminating BOC signal obtains only comprising the second cumulative signal of the main peak of BOC signal.

In embodiments of the present invention, according to receiving signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal, from default Doppler shift set, select a Doppler shift and select a pseudo-code phase from default pseudo-code phase set, according to Doppler shift and the pseudo-code phase selected, the first intermediate-freuqncy signal is processed and obtained the first M signal, and the second intermediate-freuqncy signal is processed and obtained the second M signal, obtain sub-carrier signal, the other peak-to-peak signal of BOC of eliminating the first M signal by this sub-carrier signal obtains the first cumulative signal, the other peak-to-peak signal of BOC of eliminating the second M signal by this sub-carrier signal obtains the second cumulative signal, according to the first cumulative signal and the second cumulative signal, can determine exactly that whether the Doppler shift selected and pseudo-code phase be Doppler shift and the pseudo-code phase of the satellite-signal of finally catching, thereby improve the Doppler shift of capturing satellite signal and the precision of pseudo-code phase.

Accompanying drawing explanation

Fig. 1 is a kind of Doppler shift of capturing satellite signal and the method flow diagram of pseudo-code phase that the embodiment of the present invention 1 provides;

Fig. 2-1st, the process flow diagram of a kind of modulated satellite signals that the embodiment of the present invention 2 provides;

Fig. 2-2nd, the Doppler shift of a kind of capturing satellite signal that the embodiment of the present invention 2 provides and the method flow diagram of pseudo-code phase

Fig. 2-3rd, a kind of receiver structure schematic diagram that the embodiment of the present invention 2 provides;

Fig. 2-4th, the first relevant integration module that the embodiment of the present invention 2 provides or the structural representation of the second relevant integration module;

Fig. 3 is a kind of Doppler shift of capturing satellite signal and the apparatus structure schematic diagram of pseudo-code phase that the embodiment of the present invention 3 provides.

Embodiment

For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.

Embodiment 1

Referring to Fig. 1, the embodiment of the present invention provides a kind of Doppler shift of capturing satellite signal and the method for pseudo-code phase, comprising:

Step 101: receive signal, receive signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal according to this;

Step 102: select a Doppler shift and select a pseudo-code phase from default Doppler shift set from default pseudo-code phase set;

Step 103: according to Doppler shift and the pseudo-code phase selected, the first intermediate-freuqncy signal is processed and obtained the first M signal, and the second intermediate-freuqncy signal is processed and obtained the second M signal;

Step 104: obtain sub-carrier signal, the other peak-to-peak signal of BOC of eliminating the first M signal by this sub-carrier signal obtains the first cumulative signal;

Step 105: the other peak-to-peak signal of BOC of eliminating the second M signal by this sub-carrier signal obtains the second cumulative signal;

Step 106: obtain non-coherent integration value according to the first cumulative signal and the second cumulative signal;

Step 107: if this non-coherent integration value is less than predetermined threshold value, Doppler shift and pseudo-code phase that the Doppler shift of determine selecting and pseudo-code phase are the satellite-signal of finally catching.

In embodiments of the present invention, according to receiving signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal, from default Doppler shift set, select a Doppler shift and select a pseudo-code phase from default pseudo-code phase set, according to Doppler shift and the pseudo-code phase selected, the first intermediate-freuqncy signal is processed and obtained the first M signal, and the second intermediate-freuqncy signal is processed and obtained the second M signal, obtain sub-carrier signal, the other peak-to-peak signal of BOC of eliminating the first M signal by this sub-carrier signal obtains the first cumulative signal, the other peak-to-peak signal of BOC of eliminating the second M signal by this sub-carrier signal obtains the second cumulative signal, according to the first cumulative signal and the second cumulative signal, can determine exactly that whether the Doppler shift selected and pseudo-code phase be Doppler shift and the pseudo-code phase of the satellite-signal of finally catching, thereby improve the Doppler shift of capturing satellite signal and the precision of pseudo-code phase.

Embodiment 2

The embodiment of the present invention provides a kind of Doppler shift of capturing satellite signal and the method for pseudo-code phase.Wherein, the satellite-signal that receiver need to rely on satellite positions self, and the signal that receiver receives is the mixed signal being mixed by multi-signal, this mixed signal is that satellite-signal and non-satellite-signal mix, therefore receiver need to first be caught Doppler shift and the pseudo-code phase of the satellite-signal of satellite, then according to this Doppler shift and pseudo-code phase, from receive signal, extract satellite-signal.

In satellite navigation system, satellite adopts BOC modulation system to modulate the navigation message of its transmission.Referring to Fig. 2-1, the pseudo-code generator in satellite produces pseudo-code sequence, and the pseudo-code sequence of navigation message and pseudo-code generator generation is multiplied each other and obtains M signal; The subcarrier generator of satellite produces sub-carrier signal, this sub-carrier signal and this M signal are multiplied each other and obtain BOC signal, the main carrier generator of satellite produces main carrier signal, this BOC signal and this main carrier signal are multiplied each other and obtain carrier signal, this BOC signal and this main carrier signal are carried out to BPSK (Binary Phase Shift Keying, simulating signal converts data value to) modulation obtain carrier signal, send this carrier signal.

In related function due to the BOC signal that adopts BOC modulation system to obtain, comprise other peak-to-peak signal, the Doppler shift of receiver capturing satellite signal and pseudo-code phase generation are had a strong impact on; Therefore in embodiments of the present invention, adopt following method flow to eliminate the other peak-to-peak signal that BOC signal comprises, with this, improve the Doppler shift of capturing satellite signal and the precision of pseudo-code phase.Referring to Fig. 2-2, the method comprises:

Step 201: receiver receives signal, the signal of reception is converted to intermediate-freuqncy signal, and this intermediate-freuqncy signal is divided into two-way, is respectively the first intermediate-freuqncy signal and the second intermediate-freuqncy signal;

Referring to the receiver structure schematic diagram shown in Fig. 2-3, mark off after the first intermediate-freuqncy signal and the second intermediate frequency information, receiver inputs to the first intermediate-freuqncy signal in the first frequency mixer of receiver, the second intermediate-freuqncy signal is inputed to the second frequency mixer of receiver.

Step 202: receiver is selected a Doppler shift and select a pseudo-code phase from default pseudo-code phase set from default Doppler shift set;

Referring to Fig. 2-3, the acquisition control module that receiver comprises is selected a Doppler shift and select a pseudo-code phase from default pseudo-code phase set from default Doppler shift set.

Step 203: receiver obtains sinusoidal carrier signal and cosine carrier signal according to the Doppler shift of selecting, and obtain the first pseudo-code and the second pseudo-code according to the pseudo-code phase of selecting;

Referring to Fig. 2-3, the acquisition control module of receiver sends to the Doppler shift of selection the carrier generator of receiver, and the code generator that the pseudo-code phase of selection is sent to receiver.The carrier generator of receiver receives this Doppler shift, according to this Doppler shift, produces a carrier signal, frequency size and the Doppler shift equal and opposite in direction of selecting of this carrier signal.Carrier generator divides two-way by the carrier signal of generation, gives the sinusoidal unit of receiver by wherein riches all the way, another road is sent to the cosine unit of receiver; Jiang Gai road, sinusoidal unit carrier signal is converted to sinusoidal carrier signal, and cosine unit is converted to cosine carrier signal by another road carrier signal.Code generator produces pseudo-code according to this pseudo-code phase, and this pseudo-code is divided into the first pseudo-code and the second pseudo-code, phase place size and the pseudo-code phase equal and opposite in direction of selecting of the pseudo-code of generation.

Step 204: receiver carries out mixing computing by sinusoidal carrier signal and the first intermediate-freuqncy signal and obtains the first baseband signal, carries out mixing computing by cosine carrier signal and the second intermediate-freuqncy signal and obtains the second baseband signal;

Referring to Fig. 2-3, the sinusoidal unit of receiver sends to sinusoidal carrier signal in the first frequency mixer of receiver, and the first frequency mixer carries out mixing computing and obtains the first baseband signal the first intermediate-freuqncy signal of input and sinusoidal carrier signal.The cosine unit of receiver sends to cosine carrier signal in the second frequency mixer of receiver, and the second frequency mixer carries out mixing computing and obtains the second baseband signal the second intermediate-freuqncy signal of input and cosine carrier signal.The first frequency mixer and the second frequency mixer can be all multiplier.

Step 205: receiver, according to the first pseudo-code and the first baseband signal, obtains the first M signal, according to the second pseudo-code and the second baseband signal, obtains the second M signal;

Referring to Fig. 2-3, the first frequency mixer of receiver inputs to the first baseband signal the first multiplier of receiver, the code generator of receiver sends to the first multiplier by the first pseudo-code, the first multiplier carries out phase multiplication to the first baseband signal and the first pseudo-code and obtains the first M signal, and the first M signal is inputed to the first relevant integration module of receiver.The second frequency mixer of receiver inputs to the second baseband signal the second multiplier of receiver, the code generator of receiver sends to the second multiplier by the second pseudo-code, the second multiplier carries out phase multiplication to the second baseband signal and the second pseudo-code and obtains the second M signal, and the second M signal is inputed to the second relevant integration module of receiver.

Step 206: receiver obtains sub-carrier signal and the N in the pseudo-code generation cycle the first M signal, duration corresponding to each the first M signal equates with the duration of square-wave signal in sub-carrier signal;

Referring to Fig. 2-3, the subcarrier generator of receiver produces sub-carrier signal and inputs to the first relevant integration module and the second relevant integration module, and the sub-carrier signal of generation is comprised of a plurality of square-wave signals, and duration corresponding to each square-wave signal equates.The first relevant integration module is obtained N first M signal in the pseudo-code generation cycle.Code generator periodically produces pseudo-code according to the pseudo-code cycle that produces, and it is the integral multiple of the duration that square wave is corresponding that a pseudo-code produces duration corresponding to cycle.

For example, referring to the structural representation of Fig. 2-4 the first relevant integration module, the first relevant integration module is obtained the N of a pseudo-code in the cycle the first M signal, is respectively wherein, T _sit is the duration that the first M signal is corresponding.

Step 207: receiver, according to sub-carrier signal, obtains N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal;

Particularly, for each first M signal in N the first M signal, this first M signal is copied into N road reproducing signals, this sub-carrier signal is copied and obtains N way carrier signal, the way carrier signal that reproducing signals Zhong Mei road, N road reproducing signals correspondence copies.For every road reproducing signals, the way carrier signal that this reproducing signals is corresponding with this reproducing signals multiplies each other, obtain corresponding the 3rd M signal of this road reproducing signals, obtain in a manner described N road the 3rd M signal, calculate the average signal of N road the 3rd M signal, using this average signal as the first subsignal corresponding to the first M signal.Again the first M signal is copied into N road reproducing signals, calculates the average signal of this N road reproducing signals, using this average signal as the second subsignal corresponding to the first M signal.Get in a manner described N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal.

Referring to Fig. 2-4, for the first M signal the first relevant integration module is by the first M signal be copied into N road reproducing signals, receive the sub-carrier signal that subcarrier generator produces, subcarrier generator is copied into N way carrier signal.The first relevant integration module comprises N multiplier, and Jiang Mei road reproducing signals and the sub-carrier signal copying are input to a multiplier, and each multiplier in N multiplier multiplies each other and obtains the 3rd M signal the reproducing signals of inputting and sub-carrier signal, is respectively the first relevant integration module is the 3rd M signal again be input in a totalizer and by this totalizer and calculate average signal by the average signal calculating as the first M signal the first subsignal.Again to the first M signal copy and obtain N road reproducing signals, be respectively by reproducing signals be input in a totalizer and by this totalizer and calculate average signal by the average signal calculating as the first M signal the second subsignal.

For the first M signal getting in a manner described the first corresponding subsignal is and second subsignal be , for the first M signal getting in a manner described the first corresponding subsignal is and second subsignal be , for the first M signal getting in a manner described the first corresponding subsignal is and second subsignal be

Step 208: receiver is according to corresponding the first subsignal and the second subsignal of each first M signal in N the first M signal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal;

Particularly, the first relevant integration module of receiver, according to corresponding the first subsignal and the second subsignal of each first M signal in N the first M signal, is calculated as follows out the first cumulative signal of the main peak that only comprises BOC signal.

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

Wherein, $R^0\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^0+R_{\mathrm{Csub}}^0,R^{N-1}\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^{N-1}+{(-1)}^{N-1}{R}_{\mathrm{Csub}}^{N-1}.$

Step 209: receiver obtains a N in the pseudo-code generation cycle the second M signal, duration corresponding to each the second M signal equates with the duration of square-wave signal in sub-carrier signal;

Referring to Fig. 2-3, the subcarrier generator of receiver produces sub-carrier signal and inputs to the second relevant integration module and the second relevant integration module, and the sub-carrier signal of generation is comprised of a plurality of square-wave signals, and duration corresponding to each square-wave signal equates.The second relevant integration module is obtained N first M signal in the pseudo-code generation cycle.Code generator periodically produces pseudo-code according to the pseudo-code cycle that produces, and it is the integral multiple of the duration that square wave is corresponding that a pseudo-code produces duration corresponding to cycle.

For example, the structure of the first relevant integration module is identical with the structure of the second relevant integration module.Fig. 2-4 are also the structural representation of the second relevant integration module, and the second relevant integration module is obtained the N of a pseudo-code in the cycle the second M signal, is respectively wherein, T _sit is the duration that the first M signal is corresponding.

Step 210: receiver, according to sub-carrier signal, obtains N corresponding the first subsignal and the second subsignal of each second M signal in the second M signal;

Particularly, for each second M signal in N the second M signal, this second M signal is copied into N road reproducing signals, this sub-carrier signal is copied and obtains N way carrier signal, the way carrier signal that reproducing signals Zhong Mei road, N road reproducing signals correspondence copies.For every road reproducing signals, the way carrier signal that this reproducing signals is corresponding with this reproducing signals multiplies each other, obtain corresponding the 3rd M signal of this road reproducing signals, obtain in a manner described N road the 3rd M signal, calculate the average signal of N road the 3rd M signal, using this average signal as the first subsignal corresponding to the first M signal.Again the first M signal is copied into N road reproducing signals, calculates the average signal of this N road reproducing signals, using this average signal as the second subsignal corresponding to the second M signal.Get in a manner described N corresponding the first subsignal and the second subsignal of each first M signal in the second M signal.

Referring to Fig. 2-4, for the second M signal the second relevant integration module is by the second M signal be copied into N road reproducing signals, receive the sub-carrier signal that subcarrier generator produces, subcarrier generator is copied into N way carrier signal.The second relevant integration module comprises N multiplier, and Jiang Mei road reproducing signals and the sub-carrier signal copying are input to a multiplier, and each multiplier in N multiplier multiplies each other and obtains the 3rd M signal the reproducing signals of inputting and sub-carrier signal, is respectively the first relevant integration module is the 3rd M signal again be input in a totalizer and by this totalizer and calculate average signal by the average signal calculating as the second M signal the first subsignal.Again to the second M signal copy and obtain N road reproducing signals, be respectively by reproducing signals be input in a totalizer and by this totalizer and calculate average signal by the average signal calculating as the second M signal the second subsignal.

For the second M signal getting in a manner described the first corresponding subsignal is and second subsignal be , for the second M signal getting in a manner described the first corresponding subsignal is and second subsignal be , for the second M signal getting in a manner described the first corresponding subsignal is and second subsignal be

Step 211: receiver is according to corresponding the first subsignal and the second subsignal of each second M signal in N the second M signal, the other peak of eliminating BOC signal obtains only comprising the second cumulative signal of the main peak of BOC signal;

Particularly, the second relevant integration module of receiver, according to corresponding the first subsignal and the second subsignal of each second M signal in N the second M signal, is calculated as follows out the second cumulative signal of the main peak that only comprises BOC signal.

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

Step 212: according to the first cumulative signal and the second cumulative signal, obtain non-coherent integration value, if this non-coherent integration value is less than predetermined threshold value, perform step 213, otherwise, determine that Doppler shift and the pseudo-code phase selected are Doppler shift and the pseudo-code phase of catching;

Particularly, the first cumulative signal is carried out to square operation and obtain the first relevant integral result, the second cumulative signal is carried out to square operation and obtain the second relevant integral result, the first relevant integral result is added to the second relevant integral result, obtain non-coherent integration value, if this non-coherent integration value is less than predetermined threshold value, perform step 213, otherwise, determine that Doppler shift and the pseudo-code phase selected are Doppler shift and the pseudo-code phase of catching.

Wherein, referring to Fig. 2-3, first square of module of receiver carried out square operation to the first cumulative signal and obtained the first relevant integral result, and second square of module carried out square operation to the second cumulative signal and obtained the second relevant integral result.The non-coherent integration module of receiver adds the second relevant integral result by the first relevant integral result, obtains non-coherent integration value.

Step 213: receiver is selected a unselected Doppler shift from default Doppler shift set, and from default pseudo-code phase set, select a unselected pseudo-code phase, execution step 203.

In embodiments of the present invention, according to receiving signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal, from default Doppler shift set, select a Doppler shift and select a pseudo-code phase from default pseudo-code phase set, according to Doppler shift and the pseudo-code phase selected, the first intermediate-freuqncy signal is processed and obtained the first M signal, and the second intermediate-freuqncy signal is processed and obtained the second M signal, obtain sub-carrier signal, the other peak-to-peak signal of BOC of eliminating the first M signal by this sub-carrier signal obtains the first cumulative signal, the other peak-to-peak signal of BOC of eliminating the second M signal by this sub-carrier signal obtains the second cumulative signal, according to the first cumulative signal and the second cumulative signal, can determine exactly that whether the Doppler shift selected and pseudo-code phase be Doppler shift and the pseudo-code phase of the satellite-signal of finally catching, thereby improve the Doppler shift of capturing satellite signal and the precision of pseudo-code phase.

Embodiment 3

Referring to Fig. 3, the embodiment of the present invention provides a kind of Doppler shift of capturing satellite signal and the device of pseudo-code phase, comprising:

The first acquisition module 301, for reception signal, receives signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal according to this;

Select module 302, for selecting a Doppler shift from default Doppler shift set and select a pseudo-code phase from default pseudo-code phase set;

Processing module 303, for according to Doppler shift and the pseudo-code phase selected, processes and obtains the first M signal the first intermediate-freuqncy signal, and the second intermediate-freuqncy signal is processed and obtained the second M signal;

The first cancellation module 304, for obtaining sub-carrier signal, the other peak-to-peak signal of BOC of eliminating the first M signal by this sub-carrier signal obtains the first cumulative signal;

The second cancellation module 305, obtains the second cumulative signal for eliminate the other peak-to-peak signal of BOC of the second M signal by this sub-carrier signal;

The second acquisition module 306, for obtaining non-coherent integration value according to the first cumulative signal and the second cumulative signal;

Determination module 307, if be less than predetermined threshold value for this non-coherent integration value, Doppler shift and pseudo-code phase that the Doppler shift of determine selecting and pseudo-code phase are the satellite-signal of finally catching.

Preferably, the first cancellation module 304 comprises:

The first acquiring unit, for obtaining a N in the pseudo-code generation cycle the first M signal, duration corresponding to each the first M signal equates with the duration of square-wave signal in sub-carrier signal;

Second acquisition unit, for according to this sub-carrier signal, obtains N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal;

First eliminates unit, and for according to the first subsignal corresponding to each first M signal and the second subsignal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal.

Preferably, described first eliminates unit, for according to the first subsignal corresponding to each first M signal and the second subsignal, is calculated as follows out the first cumulative signal of the main peak that only comprises BOC signal;

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

In above-mentioned formula, R _finalbe the first cumulative signal, be i the first subsignal corresponding to the first M signal, be i the second subsignal corresponding to the first M signal.

Preferably, the second cancellation module 305 comprises:

The 3rd acquiring unit, for obtaining a N in the pseudo-code generation cycle the second M signal, duration corresponding to each the second M signal equates with the duration of square-wave signal in sub-carrier signal;

The 4th acquiring unit, for according to this sub-carrier signal, obtains the first subsignal and the second subsignal that each second M signal is corresponding;

Second eliminates unit, and for according to the first subsignal corresponding to each second M signal and the second subsignal, the other peak of eliminating BOC signal obtains only comprising the second cumulative signal of the main peak of BOC signal.

In embodiments of the present invention, according to receiving signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal, from default Doppler shift set, select a Doppler shift and select a pseudo-code phase from default pseudo-code phase set, according to Doppler shift and the pseudo-code phase selected, the first intermediate-freuqncy signal is processed and obtained the first M signal, and the second intermediate-freuqncy signal is processed and obtained the second M signal, obtain sub-carrier signal, the other peak-to-peak signal of BOC of eliminating the first M signal by this sub-carrier signal obtains the first cumulative signal, the other peak-to-peak signal of BOC of eliminating the second M signal by this sub-carrier signal obtains the second cumulative signal, according to the first cumulative signal and the second cumulative signal, can determine exactly that whether the Doppler shift selected and pseudo-code phase be Doppler shift and the pseudo-code phase of the satellite-signal of finally catching, thereby improve the Doppler shift of capturing satellite signal and the precision of pseudo-code phase.

One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can come the hardware that instruction is relevant to complete by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (8)

1. the Doppler shift of capturing satellite signal and a method for pseudo-code phase, is characterized in that, described method comprises:

Receive signal, according to described reception signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal;

From default Doppler shift set, select a Doppler shift and select a pseudo-code phase from default pseudo-code phase set;

According to described Doppler shift and described pseudo-code phase, described the first intermediate-freuqncy signal is processed and obtained the first M signal, and described the second intermediate-freuqncy signal is processed and obtained the second M signal;

Obtain sub-carrier signal, the other peak-to-peak signal of binary offset carrier BOC of eliminating described the first M signal by described sub-carrier signal obtains the first cumulative signal;

The other peak-to-peak signal of BOC of eliminating described the second M signal by described sub-carrier signal obtains the second cumulative signal;

According to described the first cumulative signal and described the second cumulative signal, obtain non-coherent integration value;

If described non-coherent integration value is less than predetermined threshold value, determine Doppler shift and pseudo-code phase that described Doppler shift and described pseudo-code phase are the satellite-signal of finally catching.

2. the method for claim 1, is characterized in that, the described other peak-to-peak signal of binary offset carrier BOC of eliminating described the first M signal by described sub-carrier signal obtains the first cumulative signal, comprising:

Obtain a N in the pseudo-code generation cycle the first M signal, duration corresponding to each the first M signal equates with the duration of square-wave signal in sub-carrier signal;

According to described sub-carrier signal, obtain described N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal;

First subsignal and second subsignal corresponding according to described each first M signal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal.

3. method as claimed in claim 2, is characterized in that, corresponding the first subsignal and the second subsignal of each first M signal described in described basis, and the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal, comprising:

First subsignal and second subsignal corresponding according to described each first M signal, be calculated as follows out the first cumulative signal of the main peak that only comprises BOC signal;

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

In above-mentioned formula, R _finalbe the first cumulative signal, be i the first subsignal corresponding to the first M signal, be i the second subsignal corresponding to the first M signal.

4. method as claimed in claim 2, is characterized in that, the described other peak-to-peak signal of BOC of eliminating described the second M signal by described sub-carrier signal obtains the second cumulative signal, comprising:

Obtain a N in the pseudo-code generation cycle the second M signal, duration corresponding to each the second M signal equates with the duration of square-wave signal in sub-carrier signal;

According to described sub-carrier signal, obtain described corresponding the first subsignal and the second subsignal of each second M signal;

First subsignal and second subsignal corresponding according to described each second M signal, the other peak of eliminating BOC signal obtains only comprising the second cumulative signal of the main peak of BOC signal.

5. the Doppler shift of capturing satellite signal and a device for pseudo-code phase, is characterized in that, described device comprises:

The first acquisition module, for reception signal, according to described reception signal acquisition the first intermediate-freuqncy signal and the second intermediate-freuqncy signal;

Select module, for selecting a Doppler shift from default Doppler shift set and select a pseudo-code phase from default pseudo-code phase set;

Processing module, for according to described Doppler shift and described pseudo-code phase, processes and obtains the first M signal described the first intermediate-freuqncy signal, and described the second intermediate-freuqncy signal is processed and obtained the second M signal;

The first cancellation module, for obtaining sub-carrier signal, the other peak-to-peak signal of binary offset carrier BOC of eliminating described the first M signal by described sub-carrier signal obtains the first cumulative signal;

The second cancellation module, obtains the second cumulative signal for eliminate the other peak-to-peak signal of BOC of described the second M signal by described sub-carrier signal;

The second acquisition module, for obtaining non-coherent integration value according to described the first cumulative signal and described the second cumulative signal;

Determination module, if be less than predetermined threshold value for described non-coherent integration value, determines Doppler shift and pseudo-code phase that described Doppler shift and described pseudo-code phase are the satellite-signal of finally catching.

6. device as claimed in claim 5, is characterized in that, described the first cancellation module comprises:

The first acquiring unit, for obtaining a N in the pseudo-code generation cycle the first M signal, duration corresponding to each the first M signal equates with the duration of square-wave signal in sub-carrier signal;

Second acquisition unit, for according to described sub-carrier signal, obtains described N corresponding the first subsignal and the second subsignal of each first M signal in the first M signal;

First eliminates unit, and for first subsignal and second subsignal corresponding according to described each first M signal, the other peak of eliminating BOC signal obtains only comprising the first cumulative signal of the main peak of BOC signal.

7. device as claimed in claim 6, is characterized in that,

Described first eliminates unit, for first subsignal and second subsignal corresponding according to described each first M signal, is calculated as follows out the first cumulative signal of the main peak that only comprises BOC signal;

$\left\{\begin{array}{c}{R}_{\mathrm{final}}=R_{\mathrm{com}}\left(\mathrm{\τ}\right)\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{R}^i\left(\mathrm{\τ}\right)\\ R^i\left(\mathrm{\τ}\right)=R_{\mathrm{SCsub}}^i+{(-1)}^i{R}_{\mathrm{Csub}}^i\\ R_{\mathrm{com}}\left(\mathrm{\τ}\right)=[R^0\left(\mathrm{\τ}\right)+R^{N-1}\left(\mathrm{\τ}\right)]-|R^0\left(\mathrm{\τ}\right)-R^{N-1}\left(\mathrm{\τ}\right)|\end{array}\right.$

In above-mentioned formula, R _finalbe the first cumulative signal, be i the first subsignal corresponding to the first M signal, be i the second subsignal corresponding to the first M signal.

8. device as claimed in claim 5, is characterized in that, described the second cancellation module comprises:

The 3rd acquiring unit, for obtaining a N in the pseudo-code generation cycle the second M signal, duration corresponding to each the second M signal equates with the duration of square-wave signal in sub-carrier signal;

The 4th acquiring unit, for according to described sub-carrier signal, obtains described corresponding the first subsignal and the second subsignal of each second M signal;

Second eliminates unit, and for first subsignal and second subsignal corresponding according to described each second M signal, the other peak of eliminating BOC signal obtains only comprising the second cumulative signal of the main peak of BOC signal.