CN102156289B - Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite - Google Patents
Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite Download PDFInfo
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Abstract
The invention discloses a dual-mode positioning time-service type receiver for a compass satellite and a global positioning system (GPS) satellite. The receiver comprises an antenna module, a radio frequency channel module, a compass processing module, a GPS processing module and an expansion board module, wherein the antenna module comprises a compass receiving antenna, a compass transmitting antenna and a GPS receiving antenna; the compass receiving antenna is used for receiving a compass satellite downlink signal; a compass downlink radio frequency navigation signal is acquired by filtration of a filter and amplification of a compass low-noise amplifier; the compass transmitting antenna receives the signal which is transmitted by a compass power amplifier and transmits a signal to the compass satellite in the sky; and the GPS receiving antenna is used for receiving a GPS satellite downlink signal. The invention provides the receiver which receives the signals of the compass satellite and the GPS satellite simultaneously, so that functions of compass time service, compass positioning, GPS time service and GPS positioning can be realized, the receiver is independent of the GPS, and the safety and stability of civil basic industries of our country are improved.
Description
Technical field
The present invention relates to the satellite application field, be specifically related to a kind of big-dipper satellite and gps satellite bimodulus location time service type receiver.
Background technology
the Navsat in the whole world mainly contains the GPS (Global Position System) GPS (Global Positioning System) of the U.S. at present, Muscovite GLONASS (Global Navigation Satellite System) GLONASS (Global Navigation Satellite System), the Beidou satellite navigation and positioning system (Compass Navigation Satellite System) of China and the Galileo worldwide navigation positioning system (European Satellite Navigation System) of European Union.Present stage, GPS location and time service function have a wide range of applications in fields such as the traffic of China, electric power, communication, finance, water conservancy, oil; But limit because GPS is subjected to the U.S., adopt single GPS to have potential risks, its safe reliability is low, and independence is poor.Beidou satellite navigation and positioning system is the independent development capability implemented of China, the GPS (Global Position System) of independent operating.Beidou satellite navigation and positioning system can provide the location, test the speed and the time service service.Therefore, adopting Beidou satellite navigation system is inexorable trend.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of big-dipper satellite and gps satellite bimodulus to locate the time service type receiver for the deficiencies in the prior art.Adopt following technical scheme:
A kind of big-dipper satellite and gps satellite bimodulus are located the time service type receiver, comprise Anneta module, radio-frequency channel module, Big Dipper processing module, GPS processing module, expansion board module; Described Anneta module comprises Big Dipper receiving antenna, is used for receiving the big-dipper satellite downgoing signal, after filter filtering, Beidou low-noise amplifier amplify, obtains Big Dipper downlink radio frequency navigation signal; Big Dipper emitting antenna receives the signal that Big Dipper power amplifier transmits, and this signal is emitted to a day aerial big-dipper satellite; The GPS receiving antenna is used for receiving the gps satellite downgoing signal;
Described radio-frequency channel module comprises receiving unit, radiating portion and local oscillator part; Described receiving unit receives Big Dipper downlink radio frequency navigation signal, through down coversion, filtering and amplification, and the output intermediate-freuqncy signal; The transmitting data that described radiating portion reception Big Dipper processing module is sent carries out the BPSK modulation, after the outer clutter of the various bands of filtering, mails to Big Dipper power amplifier after up-conversion;
Described Big Dipper processing module comprises Big Dipper baseband processing unit and Big Dipper information process unit, and Big Dipper baseband processing unit carries out despreading, demodulation, decoding with described intermediate-freuqncy signal, and the data after decoding are sent to Big Dipper information process unit by address wire, data line; Described Big Dipper information process unit produces location and time service information, and is sent to the expansion board module; Described GPS processing module receives gps signal, obtains continuously locating information and timing results, is sent to described expansion board module; Described expansion board module is selected location and the timing results of output GPS or the Big Dipper according to user's setting.
Described big-dipper satellite and gps satellite bimodulus are located the time service type receiver, and described expansion board module comprises: power unit, interface circuit part, microcircuit information processing part.
Described big-dipper satellite and gps satellite bimodulus location time service type receiver, described Big Dipper baseband processing unit comprise that A/D subelement, down coversion subelement, Sin/Cos subelement, correlator unit, code tracking subelement, carrier track subelement, signal power are processed subelement, the frame markers is extracted subelement, Viterbi decoding subelement.
The present invention proposes a kind of receiver that receives simultaneously big-dipper satellite and gps satellite signal, can realize the function of Big Dipper time service, Big Dipper location, GPS time service, GPS location, to break away from the dependence to GPS, improves the safety and stability of the civilian basic activity of China.
Description of drawings
Fig. 1 is one-piece construction block diagram of the present invention;
Fig. 2 is Big Dipper baseband signal processing unit schematic diagram in the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1, and with reference to figure 1, a kind of big-dipper satellite and gps satellite bimodulus are located the time service type receiver, comprising:
Anneta module, radio-frequency channel module, Big Dipper processing module, GPS processing module, expansion board module.
Contain Big Dipper receiving antenna in Anneta module, be used for receiving the big-dipper satellite downgoing signal; Big Dipper emitting antenna is used for transmitting a signal to a day aerial big-dipper satellite; The GPS receiving antenna is used for receiving the gps satellite downgoing signal.
Because two frequency phase-differences that receive signal are very large, be difficult to realize with an antenna, so we are designed to two receiving antennas, on physical arrangement, we organically combine three antennas.
The Big Dipper/GPS integral antenna the key technical indexes is as follows:
1) Big Dipper emitting antenna:
2) Big Dipper receiving antenna:
3) GPS receiving antenna:
The big-dipper satellite downgoing signal that Big Dipper receiving antenna receives, after filter filtering, Beidou low-noise amplifier amplify, obtain 2491.75MHz Big Dipper downlink radio frequency navigation signal, deliver in the module of radio-frequency channel, the radio-frequency channel module comprises: receiving unit, radiating portion and local oscillator part.Empty frame part in radio-frequency channel module as shown in Figure 1.
Receiving unit receives the 2491.75MHz Big Dipper downlink radio frequency navigation signal of sending into from Anneta module, through down coversion, filtering and amplification, afterwards intermediate-freuqncy signal (12.24MHz) is sent into Big Dipper processing module.
Radiating portion carries out the BPSK modulation with the transmitting data of the 4.08MHz that Big Dipper processing module is sent, and after the outer clutter of the various bands of filtering, up-conversion mails to Big Dipper power amplifier to 1615.68MHz.
In addition, the clock reference that module transmitting-receiving in radio-frequency channel is used provides by local oscillator.Local oscillator is produced through phase locking frequency multiplying by the VCXO temperature compensating crystal oscillator of 48.96MHz, required clock when this crystal oscillator is also worked as Big Dipper processing module, and carry out frequency trim by Big Dipper processing module according to Big Dipper time service precision, reached the stability of long-term work.
The gps satellite downgoing signal that the GPS receiving antenna receives after the filtering of GPS low noise amplifier, amplifying, is delivered to the GPS processing module, and the GPS processing module is carried out timing and time service.
The intermediate-freuqncy signal of Big Dipper 12.24MHz is sent into Big Dipper processing module by the radio-frequency channel module.Described Big Dipper processing module comprises Big Dipper baseband processing unit and Big Dipper information process unit, and Big Dipper baseband processing unit carries out despreading, demodulation, decoding with described intermediate-freuqncy signal, and the data after decoding are sent to Big Dipper information process unit by address wire, data line;
Big Dipper information process unit receives the signal power of Big Dipper baseband processing unit, the power of real-time judge Big Dipper signal power.Further, Big Dipper information process unit receives the frame markers of Big Dipper baseband processing unit and extracts signal, as the timing signal of Big Dipper information process unit.Further unpack according to the downward signal of satellite form, according to broadcast message acquisition time information and positional information, and export by serial ports; By serial ports, location to be sent, timing information are sent into Big Dipper baseband processing unit, send into the radiating portion of radio-frequency channel module after recompile in Big Dipper baseband processing unit, carry out power amplification by by the satellite radiation of Big Dipper emitting antenna to the space through Big Dipper power amplifier.
Big Dipper information process unit produces location and time service information, and is sent to the expansion board module.The GPS processing module adopts LEA-5T, receives gps signal, can obtain continuously locating information and timing results, is sent to the expansion board module.The expansion board module is received location and the time service information of Big Dipper information process unit, and the location of GPS processing module and time service information, according to user's setting, selects output GPS or the location of the Big Dipper and timing results.Described expansion board module comprises: power unit, interface circuit part, microcircuit information processing part.
Power unit: mainly use the power supply chip of TI, transfer 12V to 5V, for channel module.By the TPS5430 chip, transfer 5V to 3.3V; By the TPS76918 chip, transfer 3.3V to 1.8V, by the TPS76912 chip, transfer 3.3V to 1.2V.For Big Dipper mainboard.
Interface circuit part: mainly comprise the external interface of complete machine, serial ports, 1pps interface, antennal interface etc.In addition, Big Dipper processing module and GPS processing module are located with the time service result and deliver to the expansion board module.
Microcircuit information processing part: according to the Big Dipper and the GPS integrity information received from Big Dipper processing module and GPS processing module, higher location and the time service information of judgement output accuracy.As when the Big Dipper does not have signal, system cuts the mode of operation to GPS automatically; When GPS did not have signal, system automatically switched to Big Dipper mode of operation.
Low noise amplifier in Anneta module comprises two kinds of GPS low noise amplifier and Beidou low-noise amplifiers.Be respectively used to complete the Big Dipper signal of reception and pre-filtering, the low noise amplification of gps signal.In low noise amplifier adopts, feeding classification obtains direct supply from radio-frequency module.
In the design of GPS low noise amplifier, in order effectively to improve the transmitting-receiving isolation, prevent that the Big Dipper from transmitting to the obstruction of GPS receiving cable, added one-level antiblocking wave filter at input end, and reduced the gain of first order amplifier and improve the measure such as its linear power output and effectively suppress the emitting radio frequency signal of the Big Dipper to the interference of receive channel.
The key technical indexes of GPS low-noise filter is as follows:
The Beidou low-noise amplifier the key technical indexes is as follows:
The transmitting-receiving quarantine measures of Beidou low-noise amplifier: in the design of Beidou low-noise amplifier, in order effectively to improve the transmitting-receiving isolation, prevent that the Big Dipper from transmitting to the obstruction of Big Dipper receiving cable, also added one-level antiblocking wave filter at input end, effectively suppress the emitting radio frequency signal of the Big Dipper.The key technical indexes of this wave filter is as follows:
Big Dipper power amplifier technical indicator is as follows:
Embodiment 2
As shown in Figure 2, described Big Dipper baseband processing unit comprises that A/D subelement, down coversion subelement, Sin/Cos subelement, correlator unit, code tracking subelement, carrier track subelement, signal power are processed subelement, the frame markers is extracted subelement, Viterbi decoding subelement; Described A/D subelement receives the intermediate-freuqncy signal by the 12.24MHz of radio-frequency channel module output, and this intermediate-freuqncy signal is converted into digital medium-frequency signal; Described down coversion subelement receives the carrier signal of this digital medium-frequency signal and reproduction, this digital medium-frequency signal is carried out carrier wave to be peeled off, produce the homophase (I) of zero-frequency and the quadrature sampled data of (Q) mutually, the carrier signal of described reproduction is by carrier wave NCO (digital controlled oscillator) and the generation of Sin/Cos subelement;
Described correlator unit comprises pseudo code correlation device group and pseudo-code generator, and pseudo-code NCO (being arranged on the code tracking subelement) and pseudo-code generator produce the reproduction code: leading (E) reproduction code, instant (K) reproduction code and (L) reproduction code that lags behind; Homophase (I) and quadrature (Q) sampled data are mutually sent into described pseudo code correlation device group, carry out correlation computations with described reproduction code, produce advanced code (E), instantaneous code (K) and lag behind yard (L) after relevant.
In the search phase of initialize signal, described signal power is processed subelement and whether is used for the power of advanced code (E), the instantaneous code (K) after judgement is correlated with and the code (L) that lags behind greater than predefined threshold values, as long as advanced code (E), instantaneous code (K) and one of them the power of code (L) that lags behind represent that greater than predefined threshold values signal is not synchronously just; If all less than predefined threshold values, described signal power is processed subelement and is sent control signal to pseudo-code generator, cause leading reproduction code, instant reproduction code and the reproduction code that lags behind to produce relative sliding with satellite-signal, proceed search, until signal is just synchronous.
Described code tracking subelement comprises a yard ring Discr., Loop filter, pseudo-code NCO, code ring Discr. is used for receiving advanced code (E) and the code (L) that lags behind, if instantaneous code (K) and satellite-signal are aimed at, so, the power of advanced code (E) and the code (L) that lags behind should equate, a code ring Discr. does not produce error signal; If instantaneous code (K) does not have and satellite-signal is aimed at, the power of advanced code (E) and the code (L) that lags behind is unequal so, and power deviation is directly proportional to the deviation of code, this deviation is added on pseudo-code NCO through after Loop filter, make the output frequency of pseudo-code NCO do necessary increase or reduce, thereby completed local reproduction code to the accurate tracking of satellite-signal.
Described carrier track subelement comprises carrier wave ring Discr., carrier wave NCO, carrier wave ring wave filter.Instantaneous code (K) after the reception of carrier wave ring Discr. is relevant obtains frequency and the phase deviation of carrier wave, this deviation is through the carrier wave ring wave filter, signal is adjusted in the output of carrier wave ring wave filter, adjust signal loading on carrier wave NCO and pseudo-code NCO, the output frequency of carrier wave NCO and pseudo-code NCO increases or reduces according to this adjustment signal, thereby completed local reproduction carrier frequency and phase place to the accurate tracking of satellite-signal, realized the despreading of satellite data.Because a Big Dipper generation is the OQPSK modulation, recovered the accurate phase place of carrier wave, namely can demodulate data.
Described frame markers extracts that in the satellite data sequence of subelement after according to despreading, the Barker code every the set time extracts the frame timing signal.
Described Viterbi decoding subelement is used for the satellite data sequence after synchronous, carry out data storage, Viterbi decoding and the decoding before decoding after data process and storage.Be sent to Big Dipper information process unit through the data after the decoding of Viterbi decoding subelement by address wire, data line; Wherein, the field programmable gate array in Big Dipper baseband processing unit is selected the XC3S1500-4FG456I integrated circuit.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.
Claims (2)
1. a big-dipper satellite and gps satellite bimodulus location time service type receiver, is characterized in that, comprises Anneta module, radio-frequency channel module, Big Dipper processing module, GPS processing module, expansion board module;
Described Anneta module comprises Big Dipper receiving antenna, is used for receiving the big-dipper satellite downgoing signal, after filter filtering, Beidou low-noise amplifier amplify, obtains Big Dipper downlink radio frequency navigation signal; Big Dipper emitting antenna receives the signal that Big Dipper power amplifier transmits, and this signal is emitted to a day aerial big-dipper satellite; The GPS receiving antenna is used for receiving the gps satellite downgoing signal;
Described radio-frequency channel module comprises receiving unit, radiating portion and local oscillator part; Described receiving unit receives Big Dipper downlink radio frequency navigation signal, through down coversion, filtering and amplification, and the output intermediate-freuqncy signal; The transmitting data that described radiating portion reception Big Dipper processing module is sent carries out the BPSK modulation, after the outer clutter of the various bands of filtering, mails to Big Dipper power amplifier after up-conversion;
Described Big Dipper processing module comprises Big Dipper baseband processing unit and Big Dipper information process unit, and Big Dipper baseband processing unit carries out despreading, demodulation, decoding with described intermediate-freuqncy signal, and the data after decoding are sent to Big Dipper information process unit by address wire, data line; Described Big Dipper information process unit produces location and time service information, and is sent to the expansion board module; Described GPS processing module receives gps signal, obtains continuously locating information and timing results, is sent to described expansion board module; Described expansion board module is selected location and the timing results of output GPS or the Big Dipper according to user's setting;
Described Big Dipper baseband processing unit comprises that A/D subelement, down coversion subelement, Sin/Cos subelement, correlator unit, code tracking subelement, carrier track subelement, signal power are processed subelement, the frame markers is extracted subelement, Viterbi decoding subelement; Described A/D subelement receives the intermediate-freuqncy signal by the 12.24MHz of radio-frequency channel module output, and this intermediate-freuqncy signal is converted into digital medium-frequency signal; Described down coversion subelement receives the carrier signal of this digital medium-frequency signal and reproduction, this digital medium-frequency signal is carried out carrier wave to be peeled off, produce the homophase (I) of zero-frequency and the quadrature sampled data of (Q) mutually, the carrier signal of described reproduction is by carrier wave NCO and the generation of Sin/Cos subelement;
Described correlator unit comprises pseudo code correlation device group and pseudo-code generator, and pseudo-code NCO and pseudo-code generator produce the reproduction code: leading (E) reproduction code, instant (K) reproduction code and (L) reproduction code that lags behind; Homophase (I) and quadrature (Q) sampled data are mutually sent into described pseudo code correlation device group, carry out correlation computations with described reproduction code, produce advanced code (E), instantaneous code (K) and lag behind yard (L) after relevant;
In the search phase of initialize signal, described signal power is processed subelement and whether is used for the power of advanced code (E), the instantaneous code (K) after judgement is correlated with and the code (L) that lags behind greater than predefined threshold values, as long as advanced code (E), instantaneous code (K) and one of them the power of code (L) that lags behind represent that greater than predefined threshold values signal is not synchronously just; If all less than predefined threshold values, described signal power is processed subelement and is sent control signal to pseudo-code generator, cause leading (E) to reappear code, instant (K) reproduction code and hysteresis (L) reproduction code and produce relative sliding with satellite-signal, proceed search, until signal is just synchronous;
Described code tracking subelement comprises a yard ring Discr., Loop filter, pseudo-code NCO, code ring Discr. is used for receiving advanced code (E) and the code (L) that lags behind, if instantaneous code (K) and satellite-signal are aimed at, so, the power of advanced code (E) and the code (L) that lags behind should equate, a code ring Discr. does not produce error signal; If instantaneous code (K) does not have and satellite-signal is aimed at, the power of advanced code (E) and the code (L) that lags behind is unequal so, and power deviation is directly proportional to the deviation of code, this deviation is added on pseudo-code NCO through after Loop filter, make the output frequency of pseudo-code NCO do necessary increase or reduce, thereby completed local reproduction code to the accurate tracking of satellite-signal;
Described carrier track subelement comprises carrier wave ring Discr., carrier wave NCO, carrier wave ring wave filter; Instantaneous code (K) after the reception of carrier wave ring Discr. is relevant obtains frequency and the phase deviation of carrier wave, this deviation is through the carrier wave ring wave filter, signal is adjusted in the output of carrier wave ring wave filter, adjust signal loading on carrier wave NCO and pseudo-code NCO, the output frequency of carrier wave NCO and pseudo-code NCO increases or reduces according to this adjustment signal, thereby completed local reproduction carrier frequency and phase place to the accurate tracking of satellite-signal, realized the despreading of satellite data; Because a Big Dipper generation is the OQPSK modulation, recovered the accurate phase place of carrier wave, namely can demodulate data;
Described frame markers extracts that in the satellite data sequence of subelement after according to despreading, the Barker code every the set time extracts the frame timing signal;
Described Viterbi decoding subelement is used for the satellite data sequence after synchronous, carry out data storage, Viterbi decoding and the decoding before decoding after data process and storage; Be sent to Big Dipper information process unit through the data after the decoding of Viterbi decoding subelement by address wire, data line; Wherein, the field programmable gate array in Big Dipper baseband processing unit is selected the XC3S1500-4FG456I integrated circuit.
2. big-dipper satellite according to claim 1 and gps satellite bimodulus location time service type receiver, is characterized in that, described expansion board module comprises: power unit, interface circuit part, microcircuit information processing part.
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| CN104935629B (en) * | 2015-04-22 | 2018-07-27 | 吉林大学 | In Oil Field Exploration And Development produces more satellite comprehensive service platforms and working method |
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