JP2001042022A - Gps receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a GPS receiving device capable of reducing the time required for synchronous acquisition. SOLUTION: This device is provided with a plurality of correlators 7 and a pseudo noise code phase shift part 12 to output a pseudo noise code PN of a plurality of amounts of a phase shift from a pseudo noise code generator 8 and to input it to each of the plurality of correlators 7 in a channel 4. An output signal from each correlator 7 is inputted to a deciding part 10, and the amount of a phase shift of the pseudo noise code phase shift part 12 is displaced by the number of chips obtained by dividing the number of chip of one cycle of the pseudo noise code by the number of the correlates 7 or the number of the outputs of the pseudo noise code phase shift part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a GPS receiver for receiving a signal from a GPS satellite and measuring a current position, speed, and the like of a vehicle, a person, or an object.

[0002]

2. Description of the Related Art A GPS receiving device captures GPS signals from a plurality of satellites received by a GPS receiving antenna unit,
The position information and time information of each satellite obtained from the satellite navigation message obtained from the signal, the difference between the time when the satellite transmitted the radio wave and the time when the GPS receiver received the corresponding radio wave, and the measured Doppler frequency After calculating the pseudorange and the Doppler shift between each satellite and the GPS receiver position from these, the three-dimensional position or the two-dimensional position of the GPS receiver, etc., including the error of the internal clock of the receiver are calculated as unknowns using these. It is calculated by: Alternatively, the GPS receiving apparatus transfers information necessary for positioning, that is, pseudorange, Doppler shift, time information, and the like to the base station, and performs only GPS signal reception and signal processing for performing positioning calculation on the base station side. It is configured.

Conventionally, as shown in FIG. 6, in a GPS receiving apparatus, radio waves from a plurality of GPS satellites are received by a GPS receiving antenna unit 1, and a signal received by the GPS antenna unit 1 is received by a high-frequency signal processing unit 2. The output signal from the high-frequency signal processor 2 is down-converted into an intermediate frequency signal, the digital signal converter 3 converts the output signal into a digital signal, and the carrier remover 5 generates a carrier signal on the output from the digital signal converter 3. The baseband signal BS is extracted by multiplying the output from the correlator 6, the baseband signal BS is correlated with the pseudo-noise code PN from the pseudo-noise code generator 8 in the correlator 7, and The data superimposed on the satellite signal is demodulated in the data demodulation unit 11 based on the output of Pseudo-noise code P output from the section 9
The position of the GPS antenna unit 1 is obtained by calculation in the position calculation unit 13 based on the N phase information.

[0004] The position calculation will be described in some detail. Each G
Although the frequency of the radio wave of the PS satellite is the same, a different pseudo-noise code is assigned to each GPS satellite (spread spectrum modulation), so that a predetermined number of pseudo-noise is generated in the receiver (pseudo-noise code generator 8). By generating the code, it is possible to separate and receive a signal of a predetermined GPS satellite. The correlator 7 estimates the generation timing of the pseudo-noise code of the baseband signal BS and the generation timing of the pseudo-noise code PN prepared by the pseudo-noise code generator 8 in the GPS receiver with an accuracy of within one chip. The noise code generator 8 is operated at that timing. This is called synchronization acquisition. The distance between a predetermined GPS satellite and a GPS receiver is calculated from the pseudo-noise code phase (including the pseudo-noise code number and phase) at the time of the synchronization, and by receiving radio waves from three or more GPS satellites, The position of the GPS receiving antenna unit 1 can be measured.

A pseudo-noise code PN having the same number is generated for the pseudo-noise code of the baseband signal BS, and a high correlation value is output from the correlator 7 only when the two are synchronized. In other cases, the correlation value basically becomes almost zero. Synchronous acquisition is performed by detecting and determining the output level from the correlator 7.

As a method of synchronization acquisition, a pseudo noise code PN is generated at an appropriate timing from a pseudo noise code generator 8 in a GPS receiver, and a correlation is obtained while shifting the timing little by little to attempt synchronization acquisition. There is. This will be described with reference to FIG.

The pseudo-noise code repeats the same pattern with a certain code length. The minimum unit (corresponding to one general bit) of this pattern is called a chip, and one cycle of a GPS signal (baseband signal BS: also a pseudo-noise code) is 1023 chips.

For example, as shown in FIG. 7A, an appropriate timing A (for example, the 500th chip) for the baseband signal BS from the pseudo noise code generator 8 in the receiving apparatus.
Generates a pseudo noise code PN, and the correlator 7 takes a correlation between them. Here, the operation will be described on the assumption that the numbers (patterns) of the pseudo noise codes are the same for both.
At the timing A, the correlation value is almost zero because the timings do not match. Next, it is shifted by one chip, generated at timing B (501st chip), and correlation is obtained. As a result, similarly to the timing A, the correlation value is zero. Thus, the correlation is obtained while shifting the timing. In this example, the generation timing is set to 500, 501, 502,.
Control for shifting to 0 or 1 is performed. Here, synchronization is obtained at timing C, and a high correlation value is obtained. The state of the change of the correlation value is shown in FIG. Actually, due to the type of pseudo-noise code sequence used in GPS and the influence of noise,
Small peaks occur other than during synchronization. The determination unit 10 sets a certain threshold value, determines that synchronization has been acquired if a high correlation value is obtained for the threshold value, and determines that no synchronization has been acquired if the correlation value is lower than the threshold value. . The determination information is transmitted to the pseudo-noise code generator control unit 9, and when it is not captured, a shift operation of advancing or delaying the generation phase of the pseudo-noise code in the pseudo-noise code generator 8 is performed. When the synchronization is acquired, the distance between the predetermined GPS satellite and the GPS receiver is calculated from the phase information of the pseudo-noise code PN and the demodulated data obtained by the data demodulation unit 11, and the synchronization timing is not deviated. Shift to synchronous tracking mode for monitoring. Details of the synchronization tracking will not be described here. When the phase of the pseudo-noise code is shifted for synchronization acquisition in this way, the width of the change may be originally one chip as shown in the figure, but usually, a finer unit (0.5 chip Note that the shift is performed in the following).

The above description is the basic operation of the synchronization acquisition method. The method generally used at present is a baseband signal BS for effectively shifting the timing.
The pseudo noise code generator control unit 9 sets a frequency lower than the frequency of the pseudo noise code of
The pseudo noise code generator 8 generates the pseudo noise code PN. FIG. 7C shows an outline of this operation. Similarly, when the pseudo-noise code PN generated by the pseudo-noise code generator 8 corresponds to the 500th chip with respect to the 0th chip of the baseband signal BS, the generated pseudo-noise code PN becomes 1 as in FIG. Since the frequency is lower by the ratio of / 1023, after one cycle, the baseband signal BS
The 499th chip of the pseudo noise code PN hits the chip, and the 498th chip after one cycle. Thereafter, it can be seen that the operation corresponding to the timing shift is performed sequentially. This makes it possible to easily and automatically perform the timing shift operation. In the example, unlike FIG. 7A, the shift is performed to the smaller number, but the operation intention is the same. After synchronization acquisition, the frequency of the pseudo-noise code PN generated from the pseudo-noise code generator 8 is returned to the original, and the synchronization tracking operation is performed.

[0010]

However, in the above-mentioned prior art, there is a problem that it takes time to acquire the synchronization depending on the generation timing of the pseudo noise code PN from the pseudo noise code generator 8. For example, when the pseudo-noise code PN is generated at the timing of the first chip of the pseudo-noise code PN on the 0th chip of the baseband signal, the phase shift of all chips for one period of the pseudo-noise code must be performed. A phase shift of half a cycle must be performed on average.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a GPS receiver which can reduce a synchronization acquisition time.

[0012]

According to one aspect of the present invention, there is provided a GPS receiving antenna for receiving radio waves from a plurality of GPS satellites, and an output signal from the GPS receiving antenna. A high frequency signal processing unit for down-converting the intermediate frequency signal into a digital signal, a digital signal conversion unit for converting the intermediate frequency signal into a digital signal, and a channel for calculating a distance from a GPS satellite based on the digital signal.
The channel includes a carrier removal unit that removes a carrier from the digital signal to extract a baseband signal, a pseudo noise code generator that generates a predetermined number of pseudo noise codes at a predetermined phase, and a pseudo noise code number. A pseudo-noise code generator control unit that outputs information on the phase and controls a pseudo-noise code generated from the pseudo-noise code generator, a correlator that multiplies the pseudo-noise code by the baseband signal, In a GPS receiving apparatus having a determination unit for performing synchronization determination between the baseband signal and the pseudo-noise code based on an output level of a correlator, a plurality of correlators are provided in the channel, A pseudo-noise code from the noise code generator with a plurality of phase shift amounts, and a pseudo-noise code phase shift unit for inputting the pseudo-noise code to the plurality of correlators. The phase shift amount of the pseudo-noise code phase shift unit is input to the determination unit, and the number of chips of one cycle of the pseudo-noise code is determined by the number of correlators or the number of outputs of the pseudo-noise code phase shift unit. It is characterized in that it is set to be shifted by each divided chip.

[0013] The invention according to claim 2 provides the G according to claim 1.
In the PS receiver, a plurality of the channels are provided in parallel.

According to a third aspect of the present invention, there is provided a GPS receiving antenna unit for receiving radio waves from a plurality of GPS satellites,
A high-frequency signal processing unit for down-converting an output signal from the S receiving antenna unit to an intermediate frequency signal, a digital signal converting unit for converting the intermediate frequency signal into a digital signal, and determining a distance from a GPS satellite based on the digital signal. A plurality of channels to be calculated, the channels comprising: a carrier removal unit that removes a carrier from the digital signal to extract a baseband signal; and a pseudo noise code that generates a predetermined number of pseudo noise codes at a predetermined phase. A generator, a pseudo-noise code generator control unit that outputs information on the number and phase of the pseudo-noise code and controls the pseudo-noise code generated from the pseudo-noise code generator,
A GPS receiver comprising a correlator for multiplying the baseband signal and the pseudo-noise code, and performing synchronization acquisition determination between the baseband signal and the pseudo-noise code based on an output level of the correlator In the apparatus, at least one of the plurality of channels, a pseudo-noise code from the pseudo-noise code generator is output with a plurality of phase shift amounts, and a pseudo-noise code phase shift unit input to each of the plurality of correlators. A determination unit for determining whether to acquire synchronization between the baseband signal and the pseudo-noise code based on an output level of the correlator, wherein a phase shift amount of the pseudo-noise code phase shift unit is determined by the pseudo-noise code. The number of chips in one cycle is shifted by the number of the correlators or chips divided by the number of outputs of the pseudo-noise code phase shift unit. It is intended to.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A GPS receiver according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a G according to a first embodiment of the present invention.
It is a block diagram of a PS receiver. GP according to the present embodiment
The S receiving apparatus includes a GPS receiving antenna unit 1 for receiving radio waves from a plurality of GPS satellites, as shown in FIG.
A high-frequency signal processing unit 2 for down-converting an output signal from the receiving antenna unit 1 to an intermediate frequency signal, a digital signal converting unit 3 for converting the intermediate frequency signal into a digital signal, and a GPS satellite based on the digital signal. A channel for calculating a distance, the channel including a carrier removing unit for removing a carrier from the digital signal to extract a baseband signal, and a carrier for generating a locally generated carrier used for carrier removal. A signal generator 6, a pseudo-noise code generator 8 for generating a predetermined number of pseudo-noise codes PN at a predetermined phase, and a pseudo-noise code PN number and phase information, which are output from the pseudo-noise code generator 8. A pseudo-noise code generator control unit 9 for controlling the generated pseudo-noise code PN, and a pseudo-noise code PN from the pseudo-noise code generator 8 output with a plurality of phase shift amounts. That pseudo noise code phase shift unit 12
And a plurality of correlators 7 each multiplying the baseband signal BS by the plurality of pseudo-noise codes PN having the plurality of different phase shift amounts, and the base station based on the level of an output signal from each correlator 7. Band signal BS and the pseudo-noise code P
A determination unit 10 that performs synchronization acquisition determination with N, a data demodulation unit 11 that demodulates one of the output signals of each correlator 7 based on the result of the determination unit 10, and a data demodulation unit 11 A position calculator 13 is provided for performing a position calculation from the demodulated data and the pseudo noise code phase result obtained by the pseudo noise code generator controller 9. In the present embodiment, the number of correlators 7 is three, and they are shown as correlators 7a, 7b and 7c, respectively. Also, it is assumed that the pseudo noise code phase shift unit 12 outputs pseudo noise codes with three types of phase shift amounts.

The operation of the first embodiment will be described below.
Radio waves from a plurality of GPS satellites are received by a GPS receiving antenna unit 1, and a signal output from the GPS receiving antenna unit 1 is mixed with a signal obtained by multiplying a reference frequency signal in a high frequency signal processing unit 2 to produce an intermediate frequency signal. Downconverted to The output from the high-frequency signal processor 2 is converted from an analog signal to a digital signal in a digital signal converter 3. The digital signal output from the digital signal converter 3 is multiplied by the carrier generated by the carrier signal generator 6 in the carrier remover 5,
The carrier component is removed and the baseband signal BS is extracted. This baseband signal BS is correlated with the correlators 7a, 7b, 7
c is divided and input. The pseudo noise code generator control section 9 outputs the pseudo noise code PN number and phase information to the pseudo noise code generator 8, and the pseudo noise code PN based on the information is output from the pseudo noise code generator 8. You. The pseudo-noise code PN is input to the pseudo-noise code phase shift unit 12, and the pseudo-noise code PN is divided and output from the pseudo-noise code phase shift unit 12 with three types of phase shift amounts, and the correlators 7a, 7b, and 7c, respectively. To each of the correlators 7a,
In 7b and 7c, the signal is multiplied by the baseband signal BS. Then, the determination unit monitors the level of each correlator and makes a synchronization acquisition determination.

Here, the three kinds of phase shift amounts are set so as to divide one cycle of the pseudo-noise code, that is, 1023 chips into three equal parts, for example. In this case, 34 is provided to the correlator 7a.
When there is a situation where the pseudo noise code PN starting from the first chip, the pseudo noise code PN starting from the 682 chip to the correlator 7b, and the pseudo noise code PN starting from the 0th chip to the correlator 7c are input. Occurs in

Next, a description will be given of a synchronization acquisition operation performed around the correlators 7a, 7b, 7c. Synchronous acquisition is performed by generating a pseudo-noise code PN at an appropriate timing from the pseudo-noise code generator 8 with respect to the baseband signal BS, taking a correlation while shifting the timing little by little, until a high correlation value is output. The operation of trying to acquire synchronization is repeated (that is, until synchronization is acquired) (see the description of the related art). FIG. 4 shows an example of the state of the timing of the baseband signal BS and the pseudo-noise code PN for the baseband signal BS at the time of synchronization acquisition in the present embodiment.

In the correlator 7a, the 0th chip of the baseband signal BS (having the same pseudo-noise code number as the generated pseudo-noise code PN) is compared with the 341 of the pseudo-noise code PN.
The chip hits. The correlation value in this state is zero.
Further, since the pseudo noise code PN from the pseudo noise code generator 8 has a frequency lower by the ratio of 1/1023 (see the description of the conventional technique), the timing of the chip is gradually shifted, and the baseband is shifted one cycle later. The 0th chip of the signal BS corresponds to the 340th chip of the pseudo noise code. As described above, the shift operation is automatically performed, but the same chip number is assigned to both (strictly speaking, they are slightly shifted due to a difference in frequency).
That is, it is presumed that it takes time to be synchronously captured. In the correlator 7b, the 682nd chip of the pseudo noise code PN corresponds to the 0th chip of the baseband signal BS. The correlation value in this state is also zero. Further, a shift operation is performed in a similar manner. It takes some time to acquire the synchronization, but it is presumed that the synchronization can be acquired earlier than the correlator 7a. In the correlator 7c, the 0th chip of the pseudo-noise code PN hits the 0th chip of the baseband signal BS, and a high correlation value is obtained, so that synchronization acquisition can be performed immediately. Since synchronization acquisition is performed at a plurality of timings as described above, synchronization acquisition can be performed earlier in any of the correlators, and the number of outputs of the pseudo-noise code generator 12 (or the number of This has the effect that the synchronization acquisition time can be reduced to about the reciprocal of ()). Note that the pseudo noise code phase shift amount is equally divided in one period of the pseudo noise code, but may be set to an arbitrary value instead of the equal division. Further, the form of pseudo noise code phase shift section 12 is not limited to the present embodiment. One pseudo-noise code phase shift unit 12
In addition to the present embodiment in which pseudo-noise codes PN of a plurality of shift amounts are output from, a pseudo-noise code shift unit 12 with one output may be provided for each correlator.

FIG. 3 shows a second embodiment in which five correlators 7 are provided. The operation is the same as that of the first embodiment, however, since the synchronization acquisition and the determination operation are performed with a finer shift amount by more correlators 7, the synchronization acquisition time can be further reduced. To play.

As a third embodiment, as shown in FIG. 4, the embodiment shown in FIG. 1 is applied to a GPS receiver having a plurality of channels 4. Typically,
The GPS receiver is configured to perform positioning by parallel processing of a plurality of channels. Different GPS satellites are acquired for each channel, the distance between the GPS satellite and the GPS receiving antenna unit 1 is calculated, and the position of the GPS receiving antenna unit 1 is calculated by the position calculating unit 13. The synchronization acquisition operation is the same as in the first embodiment. Compared to the method of sequentially acquiring a plurality of GPS satellites with one channel, the positioning processing speed and accuracy are improved. Note that the number of channels is not limited to this. Further, the configuration in the channel 4 may be three or more correlators as in the configuration of the channel 4 in the second embodiment.

FIG. 5 shows a fourth embodiment. The overall configuration is similar to that of the third embodiment.
Although the present invention is applied to an S receiving apparatus, a pseudo-noise code generator 8, a pseudo-noise code generator control unit 9, a pseudo-noise code phase shift unit 12, and a determination unit 10 The operation of the first and third embodiments is performed by using a correlator 7 for each channel instead of sharing one of the channels and providing a plurality of correlators for each channel. is there. Each channel has one correlator 7 for synchronization acquisition. Here, the first channel has a pseudo-noise code phase shift unit 12 and a determination unit 10.

The operation of the fourth embodiment will be described below.
The operation until the baseband signal BS is extracted by the carrier removal unit 5 is the same as in the first to third embodiments. During the synchronization tracking operation, the correlator 7 of each channel 4 operates alone, but only during synchronization acquisition.
Cooperate to perform a synchronization acquisition operation. Pseudo-noise code P output from pseudo-noise code generator 8 in the first channel
N is output by the pseudo noise code phase shift unit 12 with three types of phase shift amounts, and is input to the correlator 7 of each channel.
The correlation value output from the correlator 7 of each channel is determined by the determination unit 1
The level is input to 0, and the determination unit monitors the level of each correlator 7 to perform synchronization acquisition determination. When the synchronization is successfully acquired, the information is sent to the pseudo-noise code generator control unit 9, and the mode shifts to a synchronization tracking mode for maintaining the synchronization state. At the time of transition to the synchronous tracking mode, each channel 4 operates independently.

In this embodiment, a G having a plurality of channels
In the PS receiving apparatus, the synchronization acquisition operation can be performed using the correlator 7 in each channel 4, so that the target operation can be performed without increasing the number of correlators separately for the operation of the present invention. This has the effect.

The number of channels is not limited to the present embodiment. The embodiment of the present invention has been described above, but the present invention may be implemented by a configuration using a correlator provided separately for synchronization tracking in a GPS receiver.

[0027]

As described above, according to the first aspect of the present invention, a plurality of correlators and a pseudo-noise code from the pseudo-noise code generator are output with a plurality of phase shift amounts. A pseudo-noise code phase shift unit for inputting each of the plurality of correlators, and a determination unit for performing synchronization acquisition determination, wherein the pseudo-noise code output from the pseudo-noise code generator during synchronization acquisition is one cycle of the pseudo-noise code. The number of chips is shifted by the number of chips obtained by dividing the number of chips by the number of outputs of the pseudo-noise code generator (or the number of correlators), and a plurality of phase-shifted signals are generated and input to the plurality of correlators. Is determined based on a plurality of correlation values output from the GPS, so that the time required for determining the synchronization can be reduced.
S receiving device could be provided.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the configuration of the present invention is applied to a GPS receiver having a plurality of channels, and a plurality of GPS satellites can be synchronously acquired in parallel. This has the effect of increasing the positioning processing speed and accuracy as compared with the method of sequentially capturing a plurality of GPS satellites in one channel.

According to the third aspect of the present invention, a GPS receiver having a plurality of channels can perform a synchronization acquisition operation using a correlator of each channel. Therefore, a separate correlator is required for the operation of the present invention. There is an effect that the intended operation can be performed without increasing.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a GPS receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a state of synchronization acquisition timing in the GPS receiving device according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a GPS receiver according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a GPS receiver according to a third embodiment of the present invention.

FIG. 5 is a block diagram illustrating a GPS receiver according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional GPS receiver.

7A and 7B are diagrams showing a synchronization acquisition operation of a conventional example, and FIG.
FIG. 3 is a timing chart showing the principle of synchronization acquisition, FIG. 2B is a diagram showing a change in correlation value, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 GPS reception antenna part 2 High frequency signal processing part 3 Digital signal conversion part 4 Channel 5 Carrier wave removal part 7 Correlator 8 Pseudo noise code generation 9 Pseudo noise code generator control part 10 Judgment part 13 Position calculation part BS Baseband signal PN pseudo Noise code

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Wakio Yamada 1048 Kadoma Kadoma, Osaka Pref. Matsushita Electric Works, Ltd. (72) Inventor Masahito Fukuda 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. 1048, Kadoma, Kadoma, Fumonma-shi Matsushita Electric Works F-term (reference) 5J062 AA01 AA12 AA13 CC07 DD23 GG02 5K022 EE02 EE31

Claims (3)

[Claims] 1. A GPS receiving antenna for receiving radio waves from a plurality of GPS satellites, a high-frequency signal processing unit for down-converting an output signal from the GPS receiving antenna to an intermediate frequency signal, and converting the intermediate frequency signal into a digital signal. A digital signal conversion unit for converting the signal into a signal, and a GPS
A channel for calculating a distance from a satellite, the channel generating a carrier wave removing unit for removing a carrier wave from the digital signal to extract a baseband signal, and a pseudo-noise code having a predetermined number at a predetermined phase. A pseudo-noise code generator;
A pseudo-noise code generator control unit that outputs pseudo-noise code number and phase information and controls a pseudo-noise code generated from the pseudo-noise code generator, and multiplies the baseband signal by the pseudo-noise code A GPS receiver comprising: a correlator; and a determination unit that determines synchronization acquisition between the baseband signal and the pseudo-noise code based on an output level of the correlator. And a pseudo-noise code phase shift unit that outputs a pseudo-noise code from the pseudo-noise code generator with a plurality of phase shift amounts, and inputs the pseudo-noise code to each of the plurality of correlators. A signal is input to the determination unit, and the phase shift amount of the pseudo-noise code phase shift unit is shifted by a chip obtained by dividing the number of chips of one cycle of the pseudo-noise code by the number of correlators. A GPS receiver, wherein the GPS receiver is set. 2. The GPS receiver according to claim 1, wherein a plurality of said channels are provided. 3. A GPS receiving antenna unit for receiving radio waves from a plurality of GPS satellites, a high-frequency signal processing unit for down-converting an output signal from the GPS receiving antenna unit to an intermediate frequency signal, and digitally converting the intermediate frequency signal. A digital signal conversion unit for converting the digital signal into a GPS signal based on the digital signal;
It has a plurality of channels for calculating the distance to the satellite, the channels include a carrier removal unit that removes a carrier from the digital signal to extract a baseband signal, and a pseudo-noise code of a predetermined number with a predetermined phase. A pseudo-noise code generator to generate, a pseudo-noise code generator control unit for outputting information on the number and phase of the pseudo-noise code and controlling the pseudo-noise code generated from the pseudo-noise code generator; A GPS having a correlator for multiplying a signal by the pseudo-noise code, and performing synchronization determination between the baseband signal and the pseudo-noise code based on the output level of the correlator
In the receiving apparatus, a pseudo-noise code phase shift unit that outputs a pseudo-noise code from the pseudo-noise code generator in at least one of the plurality of channels with a plurality of phase shift amounts, and inputs the pseudo-noise code to the plurality of correlators, respectively. And a determination unit for performing synchronization acquisition determination of the baseband signal and the pseudo-noise code based on the output level of the correlator, wherein a phase shift amount of the pseudo-noise code phase shift unit is determined by the pseudo-noise code. A GPS receiver, wherein the number of chips in one cycle of a code is set to be shifted by the number of chips divided by the number of correlators.