CN101150350B - A method and device for digitalizing radio satellite signals under mixed mode - Google Patents
A method and device for digitalizing radio satellite signals under mixed mode Download PDFInfo
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Abstract
This invention discloses a method and a device for numeralizing radio satellite signals of mixed mode, in which, the method includes: mixing received GPS/CAPS radio satellite signals of various routes to signals of same central and sample frequency, carrying out coherent opeation of spread spectrum set to the mixed satllite signals and carrying out Fourier transformation to the result to get modes of signals, number of a satellite, phase of spread spectrum code and carrier Doppler frequency points to regulate frequency to the mixed signals by the signal mode and the carrier Doppler frequency point to down-converting frequency of the regulated satellite signals and generate related spread spectrum codes then to operate the signals and the code to de-spread the original data in the satellite signals by the maximum spread spectrum code sequence in the coherent values.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for digitizing a mixed-mode wireless satellite signal.
Background
The satellite navigation positioning system has wide application in various aspects such as national defense, vehicle and weapon navigation, geographic detection and the like.
There are several sets of satellite positioning systems in use internationally, the autonomous satellite positioning system used in china-the china regional positioning system (CAPS) and the GPS satellite positioning system. The system is a satellite-based navigation positioning system based on a geosynchronous orbit communication satellite, and realizes the navigation positioning function in the China area by forwarding navigation message information by using the communication satellite. The CAPS is the same as the GPS global positioning system in the United states in the speed of the navigation message and the sequence of the spread spectrum code, the frame structure of the navigation message is similar to the GPS, and the positioning principle is similar to the GPS.
Because the used positioning systems comprise two positioning systems of GPS and CAPS, the receiver needs to carry out digital processing on the wireless signals after receiving the wireless signals of the two satellites so as to obtain navigation data.
The existing receivers mainly have two types, and the first receiver can only process wireless signals of a single-mode satellite positioning system and has limitation. Therefore, a dual-mode satellite positioning scheme is proposed, which only combines two or more sets of navigation positioning receivers suitable for different modes on a hardware level, shares the same power circuit and the same output port, and increases the function of selecting and switching positioning results of different modes, but positioning devices related to various modes respectively and independently work.
Although both the above two receivers can perform digital processing on the wireless signals of the satellite, the first receiver is not suitable for a dual-mode system due to a single mode; the second receiver is suitable for two modes, but is simply combined on a hardware level, and a switching function is added, so that the hardware cost is too high, the volume and the power consumption of the whole receiver are too large, and the receiver is not a true dual-mode system.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for digitizing a mixed-mode wireless satellite signal, so as to solve the problem that the receiver cannot digitize dual-mode wireless satellite signals simultaneously.
To solve the above problems, the present invention provides a method for digitizing mixed mode wireless satellite signals, comprising:
respectively mixing the received GPS and/or CAPS wireless satellite signals to the same central frequency and sampling frequency signals;
respectively carrying out correlation operation of a spread spectrum code group on each path of satellite signals after frequency mixing, carrying out Fourier transform on correlation results after the correlation operation, and obtaining a signal mode, a satellite number, a spread spectrum code phase and a carrier Doppler frequency point of each path of satellite signals through the converted results;
carrying out frequency adjustment on the mixed signal by utilizing the signal mode and the carrier Doppler frequency point, carrying out down-conversion on the adjusted satellite signal, and generating a corresponding spread spectrum code by utilizing the signal mode, the satellite number and the spread spectrum code phase;
and carrying out correlation operation on the signal after the down-conversion and the corresponding spreading code, and despreading original data in the satellite signal by using the spreading code sequence with the maximum correlation value.
Wherein the mixing process comprises:
after interpolation and filtering are carried out on the sampling frequency of the GPS signal, the sampling frequency of the GPS signal is adjusted to be the same as the sampling frequency of the CAPS signal; and multiplying the central frequency of the CAPS signal by the frequency generated by the numerical control oscillator, filtering and adjusting the frequency to be the same as the central frequency of the GPS signal.
After obtaining the spread spectrum code phase of each path of satellite signal, the method further comprises:
and generating a corresponding spread spectrum code group by using the spread spectrum code phase, and carrying out correlation operation on each channel of the satellite signals after frequency mixing and the corresponding spread spectrum code group.
The process of generating the corresponding spreading code by using the signal mode, the satellite number and the spreading code phase comprises the following steps:
generating corresponding spread spectrum codes by utilizing the signal mode, the satellite number and the spread spectrum code phase, and generating 2 spread spectrum codes leading and lagging 0.5 chip of the spread spectrum codes;
the process of correlating the down-converted signal with the corresponding spreading code comprises:
and respectively carrying out correlation operation on the 3 spreading codes and the signals after the down-conversion.
Wherein, after the correlation operation is performed between the down-converted signal and the corresponding spreading code, the method further comprises: obtaining a carrier frequency and a spread spectrum code clock through the correlation result;
the performing frequency adjustment includes: adjusting the frequency of the mixed signal by utilizing the carrier frequency, the signal mode and the carrier Doppler frequency point;
the generating of the corresponding spreading codes comprises: and generating a corresponding spread spectrum code by using the spread spectrum code clock, the signal mode, the satellite number and the spread spectrum code phase.
The invention also provides a device for digitalizing the mixed-mode wireless satellite signal, which comprises:
the frequency adjusting unit is used for respectively mixing the received GPS and/or CAPS wireless satellite signals to the same central frequency and sampling frequency signals;
the information operation unit is used for respectively carrying out correlation operation on the spread spectrum code groups on each path of satellite signals after frequency mixing, carrying out Fourier transformation on correlation results after the correlation operation, and obtaining the signal mode, the satellite number, the spread spectrum code phase and the carrier Doppler frequency point of each path of satellite signals through the transformed results;
the fine tuning unit is used for adjusting the frequency of the mixed signal by utilizing the signal mode and the carrier Doppler frequency point and performing down-conversion on the adjusted satellite signal;
the spread spectrum code generating unit is used for generating a corresponding spread spectrum code by utilizing the signal mode, the satellite number and the spread spectrum code phase;
and the despreading unit is used for carrying out correlation operation on the signal after the down conversion and the corresponding spreading code and despreading the original data in the satellite signal by using the spreading code sequence with the maximum correlation value.
Wherein the frequency adjustment unit includes:
the interpolation filtering module is used for adjusting the sampling frequency of the GPS signal to be the same as the sampling frequency of the CAPS signal after interpolation and filtering;
and the multiplier filtering module is used for multiplying the central frequency of the CAPS signal by the frequency generated by the numerical control oscillator, filtering and adjusting the frequency to be the same as the central frequency of the GPS signal.
Wherein the apparatus further comprises:
a spread spectrum code feedback unit, configured to generate a corresponding spread spectrum code group by using the spread spectrum code phase generated by the information operation unit;
the information operation unit is further configured to perform correlation operation on each channel of the mixed satellite signals and the corresponding spreading code group.
Wherein,
the process of generating the spreading code by the spreading code generating unit comprises the following steps: generating corresponding spread spectrum codes by utilizing the signal mode, the satellite number and the spread spectrum code phase, and generating 2 spread spectrum codes leading and lagging 0.5 chip of the spread spectrum codes;
the process of the despreading unit for carrying out correlation operation comprises the following steps: and respectively carrying out correlation operation on the 3 spreading codes and the signals after the down-conversion.
Wherein the apparatus further comprises:
the frequency feedback unit is used for obtaining a carrier frequency by carrying out correlation operation results on the down-converted signal and the corresponding spreading code and feeding back the carrier frequency to the fine adjustment unit;
the fine tuning unit is also used for adjusting the frequency of the mixed signal by utilizing the carrier frequency, the signal mode and the carrier Doppler frequency point;
the spread spectrum code clock feedback unit is used for obtaining a spread spectrum code clock by carrying out correlation operation results on the signals after the down conversion and the corresponding spread spectrum codes and feeding the spread spectrum code clock back to the spread spectrum code generating unit;
the spread spectrum code generating unit is also used for generating corresponding spread spectrum codes by using the spread spectrum code clock, the signal mode, the satellite number and the spread spectrum code phase.
The method and the device can simultaneously receive and process GPS and/or CAPS signals, digitize wireless signals and obtain original data in the GPS and/or CAPS. The user can simultaneously receive signals in two satellite positioning systems by using the method and the device of the invention, thereby realizing the digitization of wireless signals and de-spreading the original data in the satellite signals. Because the signals in the satellite system in the mixed mode are processed simultaneously, the processing speed is high, the satellite signal processing is realized by adopting one device in hardware realization, the device has simple structure and is easy to realize.
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FIG. 1 is a flow chart of a method embodiment of the present invention;
fig. 2 is a block diagram of an embodiment of the apparatus of the present invention.
Detailed Description
For a clear description of the method and apparatus of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
Since the receiver receives the CAPS and GPS signals after receiving the satellite signals, only the CAPS signals or only the GPS signals may be received. Either a mixed signal or only one of the signals can be digitized using the method of the present invention. An example of the process of the present invention is described in detail below and can be seen in fig. 1, comprising:
step 101: acquiring each received wireless satellite signal;
when the receiver receives wireless signals, the receiver contains multiple paths of wireless satellite signals, and the multiple paths of CAPS signals and/or CPS signals can be received through the satellite antenna by using a mixed mode positioning system of a CAPS system and a GPS system.
Step 102: respectively mixing the received wireless satellite signals to the same central frequency and sampling frequency signals;
because the received CAPS signal and GPS signal have different sampling frequencies and center frequencies, in order to facilitate subsequent digitization, each signal needs to be mixed to a signal with the same center frequency and sampling frequency.
For example, the sampling frequency of the GPS digital intermediate frequency signal is 5.714MHz, the center frequency is 1.405MHz, and the frequency range is 1.405MHz ± 1.023 MHz; the sampling frequency of the CAPS digital intermediate frequency signal is 57.14MHz, the central frequency is 13.99MHz, and the frequency range is 13.99MHz +/-1.023 MHz, namely, the difference between the sampling frequency of the GPS and the CAPS signal is 10 times, and the difference between the central frequency is 12.585 MHz. When the signals are mixed to signals with the same intermediate frequency and sampling frequency, the sampling frequency needs to be adjusted higher and the center frequency needs to be adjusted lower.
For GPS signals, because the difference between the sampling frequency of GPS and CAPS signals is 10 times, the sampling frequency of the GPS signals can be interpolated and filtered, the interpolation coefficient is 10, and the original sampling frequency of 5.714MHz is adjusted to 57.14 MHz; the 2 cut-off frequencies of the band-pass filtering are 0.382MHz and 2.428MHz respectively, namely 1.405MHz +/-1.023 MHz.
For CAPS signals, a sinusoidal signal with a frequency of 12.585MHz (12.585-13.99-1.405) that can be generated by a numerically controlled oscillator is multiplied, i.e., mixed, with the intermediate frequency signal of CAPS. The mixed signal has two frequency ranges of high and low, which are 1.405MHz +/-1.023 MHz and 26.575MHz +/-1.023 MHz respectively, wherein the low-frequency component part is required to be reserved, and the other high-frequency component part is required to be filtered. Thus the mixing is followed by band pass filtering with 2 cut-off frequencies of 0.382MHz and 2.428MHz respectively, i.e. 1.405MHz ± 1.023MHz, for preserving signals in this range.
Through the above process, both the GPS and CAPS signals have the same sampling frequency (57.14MHz) and the same center frequency (1.405 MHz).
Step 103: respectively carrying out correlation operation of spread spectrum code groups on each path of satellite signals after frequency mixing;
and for each path of satellite signals after frequency mixing, performing correlation operation through corresponding spreading codes. For a GPS signal, since there are 32 satellites in the system, there are 32 sets of spreading codes. Carrying out down-conversion on the mixed GPS signal and then carrying out correlation operation on the mixed GPS signal and 32 groups of spread spectrum codes to obtain 32 groups of correlated results; for a CAPS signal, since the CAPS system currently has only 3 satellites, the spreading code has 3 groups. And performing down-conversion on the mixed CAPS signal, and then performing correlation operation on the mixed CAPS signal and 3 groups of spreading codes to obtain 3 groups of correlated results.
Step 104: carrying out Fourier transformation on the correlation result after the correlation operation, and obtaining the signal mode, the satellite number, the spread spectrum code phase and the carrier Doppler frequency point of each path of satellite signal through the transformed result;
since the CAPS and GPS signals have the same navigation message rate (50bps), the same spreading code rate (1.023Mcps), and the same spreading code period (1ms), the spreading code sequences loaded by the CAPS satellite signals are also the same as the 3 sets of spreading code sequences in the GPS system. Therefore, the fast fourier transform is performed on 32 sets of correlation results and 3 sets of correlation results, which are obtained, and 35 sets of correlation results, which are obtained, so as to obtain the signal mode, the satellite number, the spreading code phase and the carrier doppler frequency point of the current signal.
In addition, the correctness of the signal mode, the satellite number, the spread spectrum code phase and the carrier Doppler frequency point of the obtained current signal is increased. If the current obtained spread spectrum code phase is the GPS signal, the spread spectrum code phase is repeatedly generated to carry out correlation operation spread spectrum code; if the CAPS signal is detected, the spread code phase is repeatedly generated to carry out correlation operation on the spread code. Through multiple correlation operations, the correctness of the signal mode, the satellite number, the spread spectrum code phase and the carrier Doppler frequency point of the current signal can be effectively ensured.
doppler shift occurs due to relative motion between the terrestrial receiver and the satellite, resulting in a change in the frequency of the satellite signal as it arrives at the receiver. Therefore, the frequency of the received satellite signal needs to be adjusted by using the obtained signal mode and doppler frequency point, so as to compensate the frequency shift of the satellite signal in the transmission process.
In order to keep the stable synchronization state of the spreading codes, in the process of generating the spreading codes, besides the generated spreading codes, spreading code sequences which are 0.5 chip ahead of and 0.5 chip behind the spreading codes are generated, and 3 spreading code sequences are generated. Of course, the invention can also be implemented if a higher resolution spaced set of spreading codes is used.
The spreading code sequence loaded by 3 CAPS satellites is the same as that of some three satellites in the GPS system. Therefore, the spreading code sequence is generated without distinguishing the spreading code of the GPS/CAPS.
Step 106: and performing correlation operation on the down-converted signal in the step 105A and the 3 sequences in the step 105B.
Step 107: selecting a spreading code sequence with the maximum correlation value;
step 108: and despreading the original data in the satellite signal by using the spreading code sequence.
Through the embodiment, satellite signals in a CAPS and GPS mixed mode can be digitized.
In order to ensure that the spreading code sequence in the satellite signal is obtained in real time, step 107 of the above embodiment may further include:
step 107B: the spreading code clock for acquiring the CAPS/GPS satellite signal from the spreading code sequence in step 107 is fed back to the spreading code sequence generated in step 105B to maintain synchronization. Therefore, the spread spectrum code used by the satellite signal is ensured to be continuously obtained, the generated spread spectrum code sequence is ensured to be consistent with the spread spectrum code sequence loaded by the satellite signal in the current operation, and the original data in the satellite signal is de-spread.
By the embodiment of the method, the receiver can simultaneously receive and process the GPS and/or CAPS signals, digitize the wireless signals and obtain the original data in the GPS and/or CAPS.
The method of the present invention can be implemented in various ways, and preferred embodiments of the apparatus are given below and described in detail with reference to the accompanying drawings. Referring to fig. 2, the apparatus of the present invention comprises:
the frequency adjusting unit is used for respectively mixing the received GPS and/or CAPS wireless satellite signals to the same central frequency and sampling frequency signals;
the information operation unit is used for respectively carrying out correlation operation on the spread spectrum code groups on each path of satellite signals after frequency mixing, carrying out Fourier transformation on correlation results after the correlation operation, and obtaining the signal mode, the satellite number, the spread spectrum code phase and the carrier Doppler frequency point of each path of satellite signals through the transformed results;
the fine tuning unit is used for adjusting the frequency of the mixed signal by utilizing the signal mode and the carrier Doppler frequency point and performing down-conversion on the adjusted satellite signal;
the spread spectrum code generating unit is used for generating a corresponding spread spectrum code by utilizing the signal mode, the satellite number and the spread spectrum code phase;
and the despreading unit is used for carrying out correlation operation on the signal after the down conversion and the corresponding spreading code and despreading the original data in the satellite signal by using the spreading code sequence with the maximum correlation value.
Wherein the frequency adjustment unit includes:
the interpolation filtering module is used for adjusting the sampling frequency of the GPS signal to be the same as the sampling frequency of the CAPS signal after interpolation and filtering;
and the multiplier filtering module is used for multiplying the central frequency of the CAPS signal by the frequency generated by the numerical control oscillator, filtering and adjusting the frequency to be the same as the central frequency of the GPS signal.
Wherein the apparatus further comprises:
a spread spectrum code feedback unit, configured to generate a corresponding spread spectrum code group by using the spread spectrum code phase generated by the information operation unit;
the information operation unit is further configured to perform correlation operation on each channel of the mixed satellite signals and the corresponding spreading code group.
Wherein,
the process of generating the spreading code by the spreading code generating unit comprises the following steps: generating corresponding spread spectrum codes by utilizing the signal mode, the satellite number and the spread spectrum code phase, and generating 2 spread spectrum codes leading and lagging 0.5 chip of the spread spectrum codes;
the process of the despreading unit for carrying out correlation operation comprises the following steps: and respectively carrying out correlation operation on the 3 spreading codes and the signals after the down-conversion.
Wherein the apparatus further comprises:
the frequency feedback unit is used for obtaining a carrier frequency by carrying out correlation operation results on the down-converted signal and the corresponding spreading code and feeding back the carrier frequency to the fine adjustment unit;
the fine tuning unit is also used for adjusting the frequency of the mixed signal by utilizing the carrier frequency, the signal mode and the carrier Doppler frequency point;
the spread spectrum code clock feedback unit is used for obtaining a spread spectrum code clock by carrying out correlation operation results on the signals after the down conversion and the corresponding spread spectrum codes and feeding the spread spectrum code clock back to the spread spectrum code generating unit;
the spread spectrum code generating unit is also used for generating corresponding spread spectrum codes by using the spread spectrum code clock, the signal mode, the satellite number and the spread spectrum code phase.
Any modification, equivalent replacement, improvement, etc. made to the method and apparatus described in the embodiments of the present invention are included in the scope of protection of the present invention within the spirit and principle of the present invention.
Claims (8)
1. A method for digitizing mixed mode wireless satellite signals, comprising:
respectively mixing received GPS and/or CAPS wireless satellite signals to the same central frequency and sampling frequency signals, specifically: the sampling frequency of the GPS signal is adjusted to be the same as the sampling frequency of the CAPS signal after interpolation and filtering, the central frequency of the CAPS signal is multiplied by the frequency generated by the numerical control oscillator, and the sampling frequency is adjusted to be the same as the central frequency of the GPS signal after filtering;
respectively carrying out correlation operation of a spread spectrum code group on each path of satellite signals after frequency mixing, carrying out Fourier transform on correlation results after the correlation operation, and obtaining a signal mode, a satellite number, a spread spectrum code phase and a carrier Doppler frequency point of each path of satellite signals through the converted results;
carrying out frequency adjustment on the mixed signal by utilizing the signal mode and the carrier Doppler frequency point, carrying out down-conversion on the adjusted satellite signal, and generating a corresponding spread spectrum code by utilizing the signal mode, the satellite number and the spread spectrum code phase;
and carrying out correlation operation on the signal after the down-conversion and the corresponding spreading code, and despreading original data in the satellite signal by using the spreading code sequence with the maximum correlation value.
2. The method of claim 1, further comprising, after obtaining the spreading code phase of each satellite signal:
and generating a corresponding spread spectrum code group by using the spread spectrum code phase, and carrying out correlation operation on each channel of the satellite signals after frequency mixing and the corresponding spread spectrum code group.
3. The method of claim 1, wherein generating the corresponding spreading code using the signal pattern, the satellite number, and the spreading code phase comprises:
generating corresponding spread spectrum codes by utilizing the signal mode, the satellite number and the spread spectrum code phase, and generating 2 spread spectrum codes leading and lagging 0.5 chip of the spread spectrum codes;
the process of correlating the down-converted signal with the corresponding spreading code comprises:
and respectively carrying out correlation operation on the 3 spreading codes and the signals after the down-conversion.
4. The method of claim 1, wherein after correlating the down-converted signal with the corresponding spreading code, the method further comprises: obtaining a carrier frequency and a spread spectrum code clock through the correlation result;
the performing frequency adjustment includes: adjusting the frequency of the mixed signal by utilizing the carrier frequency, the signal mode and the carrier Doppler frequency point;
the generating of the corresponding spreading codes comprises: and generating a corresponding spread spectrum code by using the spread spectrum code clock, the signal mode, the satellite number and the spread spectrum code phase.
5. An apparatus for digitizing mixed mode wireless satellite signals, comprising:
the frequency adjusting unit is used for respectively mixing received GPS and/or CAPS wireless satellite signals to the same central frequency and sampling frequency signals, and comprises an interpolation filtering module and a multiplier filtering module, wherein the interpolation filtering module is used for adjusting the sampling frequency of the GPS signals to the sampling frequency which is the same as the CAPS signals after interpolation and filtering, and the multiplier filtering module is used for multiplying the central frequency of the CAPS signals by the frequency generated by a numerically-controlled oscillator, filtering and adjusting the central frequency to the central frequency which is the same as the GPS signals;
the information operation unit is used for respectively carrying out correlation operation on the spread spectrum code groups on each path of satellite signals after frequency mixing, carrying out Fourier transformation on correlation results after the correlation operation, and obtaining the signal mode, the satellite number, the spread spectrum code phase and the carrier Doppler frequency point of each path of satellite signals through the transformed results;
the fine tuning unit is used for adjusting the frequency of the mixed signal by utilizing the signal mode and the carrier Doppler frequency point and performing down-conversion on the adjusted satellite signal;
the spread spectrum code generating unit is used for generating a corresponding spread spectrum code by utilizing the signal mode, the satellite number and the spread spectrum code phase;
and the despreading unit is used for carrying out correlation operation on the signal after the down conversion and the corresponding spreading code and despreading the original data in the satellite signal by using the spreading code sequence with the maximum correlation value.
6. The apparatus of claim 6, further comprising:
a spread spectrum code feedback unit, configured to generate a corresponding spread spectrum code group by using the spread spectrum code phase generated by the information operation unit;
the information operation unit is further configured to perform correlation operation on each channel of the mixed satellite signals and the corresponding spreading code group.
7. The apparatus of claim 6,
the process of generating the spreading code by the spreading code generating unit comprises the following steps: generating corresponding spread spectrum codes by utilizing the signal mode, the satellite number and the spread spectrum code phase, and generating 2 spread spectrum codes leading and lagging 0.5 chip of the spread spectrum codes;
the process of the despreading unit for carrying out correlation operation comprises the following steps: and respectively carrying out correlation operation on the 3 spreading codes and the signals after the down-conversion.
8. The apparatus of claim 6, further comprising:
the frequency feedback unit is used for obtaining a carrier frequency by carrying out correlation operation results on the down-converted signal and the corresponding spreading code and feeding back the carrier frequency to the fine adjustment unit;
the fine tuning unit is also used for adjusting the frequency of the mixed signal by utilizing the carrier frequency, the signal mode and the carrier Doppler frequency point;
the spread spectrum code clock feedback unit is used for obtaining a spread spectrum code clock by carrying out correlation operation results on the signals after the down conversion and the corresponding spread spectrum codes and feeding the spread spectrum code clock back to the spread spectrum code generating unit;
the spread spectrum code generating unit is also used for generating corresponding spread spectrum codes by using the spread spectrum code clock, the signal mode, the satellite number and the spread spectrum code phase.
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| CN101634696B (en) * | 2008-07-23 | 2011-12-07 | 中国科学院国家天文台 | Signal processing method for GPS/CAPS double-module combination receiver |
| CN103517205A (en) * | 2012-06-20 | 2014-01-15 | 北京宏达科美科技有限公司 | Short message communication hand-held terminal of CPAS (China area positioning system) |
| JP5835202B2 (en) * | 2012-12-14 | 2015-12-24 | ソニー株式会社 | Communication device |
| CN106842248A (en) * | 2016-11-23 | 2017-06-13 | 西安电子科技大学昆山创新研究院 | A kind of new method for improving Beidou receiver timing locating speed |
| CN111190198B (en) * | 2020-01-14 | 2021-12-14 | 中国民用航空总局第二研究所 | Satellite receiver of GBAS test equipment and pseudo-range generation method and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1285920A (en) * | 1998-09-15 | 2001-02-28 | 三星电子株式会社 | Device for receiving signals from satelline radio-navigation systems |
| CN1285921A (en) * | 1998-11-11 | 2001-02-28 | 三星电子株式会社 | Digital correlator for receptor of signals from satellite radio-navigation systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1285920A (en) * | 1998-09-15 | 2001-02-28 | 三星电子株式会社 | Device for receiving signals from satelline radio-navigation systems |
| CN1285921A (en) * | 1998-11-11 | 2001-02-28 | 三星电子株式会社 | Digital correlator for receptor of signals from satellite radio-navigation systems |
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