CN101339034A - Circuit system and method for receiving digital broadcasting signal and navigation positioning signal - Google Patents
Circuit system and method for receiving digital broadcasting signal and navigation positioning signal Download PDFInfo
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Abstract
The invention discloses a circuit system and a method for receiving digital broadcasting signals and navigation and positioning signals. The circuit system comprises a radio-frequency circuit and a demodulation circuit; wherein, the radio-frequency circuit receives the digital broadcasting signals and the navigation and positioning signals and executes down-conversion to the received signals. In the demodulation circuit, ADC executes analog-to-digital conversion to the signals from the radio-frequency circuit; a digital broadcasting signal demodulating unit demodulates the digital broadcasting signals from the ADC signals and transmits to an interface unit; a navigation and positioning signal demodulating unit demodulates the navigation and positioning signals from the ADC signals and transmits to the interface unit. The circuit structure provided with digital broadcasting function and navigation and positioning function reduces the mutual interference between two single-function chips in multifunctional portable equipment and reduces the volume and weight of the multifunctional portable equipment. Therefore, the production efficiency of the portable equipment with the two functions is enhanced and the manufacturing cost is reduced.
Description
Technical Field
The invention belongs to the crossing field of digital broadcast communication and navigation positioning technology, and particularly relates to a circuit system and a method for receiving digital broadcast signals and navigation positioning signals.
Background
The Digital Audio Broadcasting (DAB) is a brand new digital broadcasting system developed by european manufacturers, is a third generation broadcast following am and fm broadcasts, is a revolution in the broadcasting field, and is an important component of information highways. DAB digital broadcasting has experienced nearly a decade of development, and China has just issued the national Standard for DAB (GY/T220.2-2006) to be formally implemented in 2006, 6 and 1. On the 6 th 9 th 2006, the Beijing DAB mobile multimedia broadcasting will be formally started, and digital audio and video contents are broadcasted at the same time.
The terrestrial digital multimedia broadcasting system (T-DMB) was established by korea, and is based on the Digital Audio Broadcasting (DAB) system, with some modifications in the technology, in order to broadcast over-the-air digital television programs to mobile phones, PDAs (Personal digital assistants), and other portable devices.
Besides the function of a mobile phone television, a mobile phone with a navigation and positioning function is expected to become another hot spot of the mobile phone. With the development of economy and the rise of private driving and traveling, the mobile phone with the navigation and positioning function has wide market prospect, and more people hope that the mobile phone has the function. The navigation and positioning system comprises a Global Positioning System (GPS) in the United states, a global navigation satellite system (GLONASS) in Russia, a Galileo system in Europe, a Beidou system in China and the like.
But the existing chip only has one function of DAB/T-DMB and navigation positioning functions. For example, Apollo FS1110, a product of frontier-silicon, Inc., has only DAB/T-DMB functionality. Therefore, the difficulty in realizing the two functions in the same portable equipment is high, and the difficulty is brought to the design of a mobile phone or other portable equipment with the functions of DAB/T-DMB and navigation positioning. If two independent chips having a DAB/T-DMB function and a navigation positioning function, respectively, are used in the same portable device, mutual interference is easily generated, and it is difficult to satisfy the demand for miniaturization of a multifunctional mobile phone or other portable devices.
Disclosure of Invention
The invention provides a circuit system and a method for receiving digital broadcasting signals and navigation positioning signals, and the circuit structure with the DAB/T-DMB function and the navigation positioning function reduces the mutual interference between two single-function chips in a multifunctional portable device, and reduces the volume and the weight of the multifunctional portable device.
In one aspect, a circuit system for receiving a digital broadcast signal and a navigation positioning signal is provided, which includes the following circuits:
the radio frequency circuit is used for receiving the digital broadcast signals and the navigation positioning signals and carrying out down-conversion on the received signals;
the demodulation circuit comprises an analog-to-digital converter (ADC), a digital broadcast signal demodulation unit, a navigation positioning signal demodulation unit and an interface unit. Wherein:
the analog-to-digital converter ADC is used for performing analog-to-digital conversion on a signal from the radio frequency circuit;
a digital broadcasting signal demodulation unit for demodulating and transmitting the digital broadcasting signal among the signals from the ADC to the interface unit;
and the navigation positioning signal demodulation unit is used for demodulating the navigation positioning signal in the signals from the ADC and transmitting the navigation positioning signal to the interface unit.
In the above system, the down-conversion performed by the rf circuit is to mix the received signal with the frequency of the band in which the received signal is located.
In the system, the radio frequency circuit receives and down-converts signals on a 170-240 MHz wave band and a 1200-1800 MHz wave band.
In the above system, the navigation positioning signal demodulation unit further includes the following modules:
the ADC sampling data receiving module is used for receiving ADC sampling data from the ADC;
the output data formatting module is used for formatting data to be output according to the interface requirement;
and the data output module is used for outputting data to the interface according to the interface requirement.
In the above system, the navigation positioning signal demodulation unit further includes at least one of the following modules:
the ADC sampling data filtering module is used for filtering ADC sampling data;
the sampling rate conversion module is used for carrying out sampling rate conversion on the ADC sampling data;
the synchronization module is used for synchronizing the navigation positioning signals;
the pseudo-range measurement module is used for carrying out pseudo-range measurement according to the navigation positioning signal;
and the positioning calculation module is used for performing positioning calculation according to a preset algorithm.
In the above system, the interface unit supports at least one of the following device interface types:
a serial peripheral interface SPI;
the secure digital card inputs and outputs SDIO;
a multimedia card MMC;
a UART interface of a universal asynchronous receiver-transmitter;
a Universal Serial Bus (USB) interface;
inter-integrated circuit I2C interface.
In another aspect, a method for receiving a digital broadcast signal and a navigation positioning signal is provided, which includes the following steps:
receiving a digital broadcast signal and a navigation positioning signal and performing down-conversion on the received signals;
performing analog-to-digital conversion on the down-converted signal;
demodulating and outputting digital broadcast signals in the signals after analog-to-digital conversion;
and demodulating and outputting the navigation positioning signal in the signals after the analog-to-digital conversion.
In the above method, the down-conversion is to mix the frequency of the received signal with the frequency of the band in which the received signal is located.
In the method, the receiving and down-conversion are carried out on signals on 170-240 MHz wave bands and 1200-1800 MHz wave bands.
In the above method, demodulating the navigation positioning signal in the analog-to-digital converted signal further includes the following steps:
receiving ADC sampling data after analog-to-digital conversion;
formatting data to be output according to interface requirements;
and outputting data to the interface according to the interface requirement.
In the above method, demodulating the navigation positioning signal in the analog-to-digital converted signal further includes at least one of the following steps:
filtering the ADC sampling data;
carrying out sampling rate conversion on ADC sampling data;
synchronizing the navigation positioning signals;
performing pseudo-range measurement according to the navigation positioning signal;
and performing positioning calculation according to a preset algorithm.
The main advantages and characteristics of the invention are as follows:
1) the production efficiency of the mobile phone or other portable equipment with the DAB/T-DMB function and the navigation positioning function is improved, and the manufacturing cost of the equipment is reduced;
2) the mobile phone or other portable equipment with the DAB/T-DMB function and the navigation and positioning function is more portable, and the use of a user is facilitated.
Drawings
FIG. 1 illustrates a complete receiving system for a digital broadcast signal or a navigation fix signal;
FIG. 2 is a schematic diagram of an improved RF circuit configuration of the present invention;
FIG. 3 is a schematic diagram of the structure of the improved demodulation circuit of the present invention;
fig. 4 is a schematic diagram of the internal structure of the navigation positioning signal demodulation unit in the demodulation circuit shown in fig. 3.
Detailed Description
The frequency occupied by DAB/T-DMB includes two bands: band III wave Band 170-240 MHz and L wave Band 1452 MHz-1492 MHz.
The navigation positioning system, taking GPS as an example, has the following frequencies: 1227.6MHz and 1575.42 MHz.
The invention provides a novel circuit implementation mode which can receive signals of 170-240 MHz and 1200-1800 MHz. Thus, the system can completely receive DAB/T-DMB signals, GPS and all navigation positioning signals within 1200 MHz-1800 MHz.
Radio frequency circuits and demodulation circuits are required for receiving the DAB/T-DMB digital broadcasting signals and the navigation positioning signals. Therefore, the receiving system of the digital broadcast signal is similar to the receiving system of the navigation positioning signal, and a complete receiving system is formed by the radio frequency circuit and the demodulation circuit. A complete reception system for digital broadcast signals or navigation positioning signals is shown in fig. 1.
The circuit system for receiving digital broadcast signals and navigation positioning signals comprises improvement on a radio frequency circuit and a demodulation circuit.
First, the structure of the improved rf circuit of the present invention is shown in fig. 2. The signal processing procedure for this circuit configuration is described as follows:
firstly, receiving Band III wave Band digital broadcast signals, L wave Band digital broadcast signals and L wave Band navigation positioning signals. The Band III digital broadcasting signal is received by an antenna 101 through the Band III digital broadcasting signal, and is sent to a Band switch 105 after being amplified by a 170-240 MHz Band III low noise amplifier 102; the L-band digital broadcast signal and the L-band navigation positioning signal are received by an L-band antenna 103 shared by the digital broadcast signal and the navigation positioning signal, and are amplified by a 1200-1800 MHz L-band low noise amplifier 104 and then sent to a band switch 105.
And secondly, performing down-conversion on the received Band III wave Band digital broadcast signals, L wave Band digital broadcast signals and L wave Band navigation positioning signals. The Band switch 105 selects a signal on a Band III with 170-240 MHz from the two paths of signals to be sent to one of the I branch mixer 106 and the Q branch mixer 109, and the signal is mixed with the signal with 170-240 MHz sent by the frequency synthesizer 112; signals on the L-band of 1200-1800 MHz are selected to be sent to the other mixer of the I branch mixer 106 and the Q branch mixer 109 to be mixed with signals of 1200-1800 MHz sent by the frequency synthesizer 112. The phases of the signals sent to the I branch mixer 106 and the Q branch mixer 109 by the frequency synthesizer 112 are 0-degree signal and 90-degree signal, respectively.
And thirdly, outputting the Band III wave Band digital broadcast signals, the L wave Band digital broadcast signals and the L wave Band navigation positioning signals after down-conversion. The mixed I branch signal is filtered by a low-pass filter 107 and amplified by a variable gain amplifier 108 and then sent out; the mixed Q branch signal is filtered by a low pass filter 110 and amplified by a variable gain amplifier 111, and then sent out.
Compared with the existing product such as Apollo FS1110 from frontier-silicon corporation, the radio frequency circuit shown in fig. 2 is significantly improved in that:
1) the adaptive frequency of the L-band antenna is expanded from 1452 MHz-1492 MHz to 1200-1800 MHz;
2) the adaptive frequency of the L-band low-noise amplifier is expanded from 1452 MHz-1492 MHz to 1200-1800 MHz;
3) the L-band frequency generated by the frequency synthesizer is expanded from 1452 MHz-1492 MHz to 1200-1800 MHz;
4) the frequency mixer can adapt to the frequency of 1200-1800 MHz;
5) the cut-off frequency of the low-pass filter can be changed according to different received signals, so that the low-pass filter is suitable for digital broadcast signals and navigation positioning signals;
6) the variable gain amplifier is adapted to both digital broadcast signals and navigational positioning signals.
Through the improvement, the radio frequency circuit structure of the invention can receive digital broadcast signals and navigation positioning signals.
Secondly, the structure of the improved demodulation circuit of the invention is shown in fig. 3, and the technical scheme of the invention is to add a navigation positioning signal demodulation circuit on the existing digital broadcast signal demodulation circuit. The signal processing procedure for the circuit configuration shown in fig. 3 is described as follows:
in a first step, the signal from the radio frequency circuit is analog-to-digital converted. If the signal from the rf circuit includes an I branch and a Q branch, the signal from the I branch of the rf circuit is Analog-to-digital converted by an ADC (Analog-to-digital converter) 201, and the signal from the Q branch of the rf circuit is Analog-to-digital converted by an ADC 202. If the signal from the radio frequency circuit is an intermediate frequency signal, no Q branch exists. That is, the ADC 202 in the Q branch of the self rf circuit is optional, and as shown in the block indicated by the dotted line in fig. 3, if it is determined that the rf circuit outputs only one data, the ADC in the branch can be omitted.
In the second step, the signal from the ADC is demodulated. The signal after analog-to-digital conversion is sent to the digital broadcast signal demodulation unit 203 for demodulation, and is also sent to the navigation positioning signal demodulation unit 204 for demodulation. The digital broadcast signal demodulation unit 203 and the navigation positioning signal demodulation unit 204 may or may not operate simultaneously, and the digital broadcast signal demodulation unit 203 and the navigation positioning signal demodulation unit 204 may share part of the circuits when not operating simultaneously.
And thirdly, outputting the demodulated data. The demodulated result is sent to the interface unit (SPI, SDIO, MMC, UART, USB, I2C, etc.) 205 and then to the host.
The structure of the demodulation circuit shown in fig. 3 is improved over the conventional demodulation circuit chip, such as MXD0120 of jeopardy microelectronics (shanghai) ltd, as follows:
1) a navigation positioning signal demodulation unit 204 is added;
2) the interface unit 205 is completed.
Fig. 4 is a schematic diagram of an internal structure of a navigation positioning signal demodulation unit in the demodulation circuit structure shown in fig. 3, where the navigation positioning signal demodulation unit includes all or part of the following functional modules:
the ADC sample data receiving module 204A, ADC sample data filtering module 204B, sample rate conversion module 204C, synchronization module 204D, pseudorange measurement module 204E, position solution module 204F, output data formatting module 204G, and data output module 204H.
It should be noted that, when the navigation positioning signal demodulation unit includes both the ADC sampling data filtering module 204B and the sample rate conversion module 204C, the connection order of the two modules may be exchanged, and fig. 4 only shows one of the cases for convenience of illustration.
Corresponding to the above-mentioned structure of the demodulation unit of navigation positioning signal, the signal processing procedure of the demodulation unit of navigation positioning signal includes the following whole or partial steps:
in a first step, the ADC samples data.
And secondly, filtering the ADC sampling data.
And thirdly, carrying out sampling rate conversion on the ADC sampling data.
And fourthly, synchronizing the navigation positioning signals. Either or both of time synchronization and frequency synchronization may be performed.
And fifthly, performing pseudo-range measurement according to the navigation positioning signal.
And sixthly, positioning calculation is carried out according to a preset algorithm.
And seventhly, formatting the data to be output according to the interface requirement.
And step eight, outputting data to the interface according to the interface requirement.
It should be noted that, when there are both the step of filtering the ADC sample data and the step of performing sample rate conversion on the ADC sample data in the signal processing process of the navigation positioning signal demodulation unit, the processing order of the two steps may be exchanged.
The improved Interface unit 205 supports major device interfaces such as SPI (Serial Peripheral Interface), SDIO (Secure Digital Card Input/Output), MMC (Multimedia Card), UART (Universal Asynchronous receiver transmitter), USB (Universal Serial Bus), I2C (Inter-Integrated Circuit), and the like.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. Circuitry for receiving a digital broadcast signal and a navigational positioning signal, the circuitry comprising:
the radio frequency circuit is used for receiving the digital broadcast signals and the navigation positioning signals and carrying out down-conversion on the received signals;
the demodulation circuit comprises an analog-to-digital converter (ADC), a digital broadcast signal demodulation unit, a navigation positioning signal demodulation unit and an interface unit; wherein,
the analog-to-digital converter ADC is used for performing analog-to-digital conversion on a signal from the radio frequency circuit;
a digital broadcasting signal demodulation unit for demodulating and transmitting the digital broadcasting signal among the signals from the ADC to the interface unit;
and the navigation positioning signal demodulation unit is used for demodulating the navigation positioning signal in the signals from the ADC and transmitting the navigation positioning signal to the interface unit.
2. The system of claim 1, wherein the down conversion by the radio frequency circuit is a mixing of the received signal with the frequency of the band in which it is located.
3. The system of claim 1, wherein the radio frequency circuitry receives and down-converts signals in the 170-240 MHz band and the 1200-1800 MHz band.
4. The system of claim 1, wherein the navigation positioning signal demodulation unit further comprises the following modules:
the ADC sampling data receiving module is used for receiving ADC sampling data from the ADC;
the output data formatting module is used for formatting data to be output according to the interface requirement;
and the data output module is used for outputting data to the interface according to the interface requirement.
5. The system of claim 4, wherein the navigation positioning signal demodulation unit further comprises at least one of:
the ADC sampling data filtering module is used for filtering ADC sampling data;
the sampling rate conversion module is used for carrying out sampling rate conversion on the ADC sampling data;
the synchronization module is used for synchronizing the navigation positioning signals;
the pseudo-range measurement module is used for carrying out pseudo-range measurement according to the navigation positioning signal;
and the positioning calculation module is used for performing positioning calculation according to a preset algorithm.
6. The system of claim 1, wherein the interface unit supports at least one of the following device interface types:
a serial peripheral interface SPI;
the secure digital card inputs and outputs SDIO;
a multimedia card MMC;
a UART interface of a universal asynchronous receiver-transmitter;
a Universal Serial Bus (USB) interface;
inter-integrated circuit I2C interface.
7. A method of receiving a digital broadcast signal and a navigational positioning signal, the method comprising the steps of:
receiving a digital broadcast signal and a navigation positioning signal and performing down-conversion on the received signals;
performing analog-to-digital conversion on the down-converted signal;
demodulating and outputting digital broadcast signals in the signals after analog-to-digital conversion;
and demodulating and outputting the navigation positioning signal in the signals after the analog-to-digital conversion.
8. The method of claim 7, wherein the down-converting is mixing the received signal with the frequency of the band in which it is located.
9. The method of claim 7, wherein the receiving and down-converting are performed on signals in the 170-240 MHz band and the 1200-1800 MHz band.
10. The method of claim 7, wherein demodulating the navigation positioning signal in the analog-to-digital converted signal further comprises:
receiving ADC sampling data after analog-to-digital conversion;
formatting data to be output according to interface requirements;
and outputting data to the interface according to the interface requirement.
11. The method of claim 10, wherein demodulating the navigation fix signal in the analog-to-digital converted signal further comprises at least one of:
filtering the ADC sampling data;
carrying out sampling rate conversion on ADC sampling data;
synchronizing the navigation positioning signals;
performing pseudo-range measurement according to the navigation positioning signal;
and performing positioning calculation according to a preset algorithm.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101182026A CN101339034A (en) | 2007-07-02 | 2007-07-02 | Circuit system and method for receiving digital broadcasting signal and navigation positioning signal |
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| CNA2007101182026A CN101339034A (en) | 2007-07-02 | 2007-07-02 | Circuit system and method for receiving digital broadcasting signal and navigation positioning signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109408208A (en) * | 2018-09-21 | 2019-03-01 | 深圳华大北斗科技有限公司 | Multi-task processing method, equipment, system and the storage medium of navigation chip |
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2007
- 2007-07-02 CN CNA2007101182026A patent/CN101339034A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109408208A (en) * | 2018-09-21 | 2019-03-01 | 深圳华大北斗科技有限公司 | Multi-task processing method, equipment, system and the storage medium of navigation chip |
| CN109408208B (en) * | 2018-09-21 | 2022-04-01 | 深圳华大北斗科技股份有限公司 | Multitasking method, device and system of navigation chip and storage medium |
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