CN107347180B - High-precision synchronous data transmission device and data transmission method - Google Patents
High-precision synchronous data transmission device and data transmission method Download PDFInfo
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- CN107347180B CN107347180B CN201710084596.1A CN201710084596A CN107347180B CN 107347180 B CN107347180 B CN 107347180B CN 201710084596 A CN201710084596 A CN 201710084596A CN 107347180 B CN107347180 B CN 107347180B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
When the cell downlink receiving module cannot analyze the virtual cell information, the uplink signal source processing module calculates the uplink energy of the target signal source by using the uplink target identifier and the synchronization point position information acquired by the synchronization point information receiving module to determine the accurate position of the target, otherwise, the cell downlink receiving module analyzes the communication link between the virtual cell downlink transmitting module and the target to obtain the uplink target identifier and the synchronization point position, so that the problem that the indoor energy detection equipment has an outdoor blind area can be effectively solved, and the effective target detection distance is increased.
Description
Technical Field
The invention relates to a data transmission method in the field of mobile communication, in particular to a high-precision synchronous data transmission device and a data transmission method.
Background
When using Wideband Code Division Multiple Access (WCDMA) to track a target, an outdoor active system is usually adopted to communicate with the target, obtain an uplink target identifier and a synchronization point position of the target, and calculate uplink energy of a target signal source, so as to determine a position of a building where the target is located. The indoor energy detection system then enters the building for accurate positioning of the target.
However, in practical use, there may be a situation that the indoor energy detection system and the outdoor active system cannot communicate with each other, or the communication effect is low, so that the target cannot be accurately located.
In order to solve the above problems, in the prior art, a low-frequency band high-power serial port data transmission module is adopted to transmit an Uplink target identifier (e.g. WCDMA (Wideband Code Division Multiple Access) is an Uplink scrambling Code, LTE (Long Term Evolution) is a PUSCH (Physical Uplink Shared Channel) and synchronization point position information to a receiving module, but this method is due to a low transmission rate of the serial port module and a Long Time required for the data transmission module to receive a command, which results in a large Time delay, and for a system requiring chip level precise alignment, such as WCDMA, the system cannot synchronize or cannot measure a target signal, in addition, the low-frequency band high-power serial port data transmission module further needs to transmit and receive two data transmission modules for a period of Time before transmitting data, measure RTT (Round-Trip Time) Time, and estimate the Time according to RTT (Round-Trip Time delay), however, this approach has low accuracy, which can result in synchronization drift or inaccurate energy measurement. The existing data transmission module has poor crystal oscillator and can cause the problems of decoding errors of the transmitted data and the like.
Disclosure of Invention
The invention aims to provide a high-precision synchronous data transmission device and a data transmission method, which can improve the communication performance between an indoor energy detection system and an outdoor active system, improve the precision and avoid the problems of time delay and the like.
In order to achieve the above object, the present invention provides a high-precision synchronous data transmission device, which includes an outdoor active system and an indoor energy detection system, wherein the outdoor active system includes a transmitting module and a virtual cell uplink receiving module, the transmitting module includes a synchronization point information transmitting module and a virtual cell downlink transmitting module in signal connection with the synchronization point information transmitting module, the indoor energy detection system includes a receiving module and an uplink signal source processing module, the receiving module includes a synchronization information receiving module and a cell downlink receiving module in signal connection with the synchronization information receiving module; the virtual cell downlink transmitting module and the virtual cell uplink receiving module are in communication connection with a target, and information interaction exists between the virtual cell downlink transmitting module and the virtual cell uplink receiving module; the cell downlink receiving module analyzes the signal transmitted by the virtual cell downlink transmitting module, and information interaction exists between the synchronization point information transmitting module and the synchronization point information receiving module; and the synchronous information receiving module and the cell downlink receiving module are respectively communicated with the uplink signal source processing module.
Further, in the high-precision synchronous data transmission device, the transmitting module further includes a transmitting antenna, the receiving module further includes a receiving antenna, the transmitting module sends data to the receiving antenna through the transmitting antenna, and the receiving antenna transmits the data to the receiving module.
Further, in the high-precision synchronous data transmission device, the virtual cell downlink transmission module includes a baseband data module, an intermediate frequency 90MHz module and a wireless mobile communication radio frequency module, and the synchronization point information transmission module includes a synchronization information coding module, an intermediate frequency 80MHz module and a 433MHz module; the base band data module transmits data to the intermediate frequency 90MHz module and then to the wireless mobile communication radio frequency module, the synchronous information coding module transmits data to the intermediate frequency 80MHz module and then to the 433MHz module, the base band data module sends the uplink target identification and the synchronous point position to the synchronous information coding module, and the data in the wireless mobile communication radio frequency module and the 433MHz module are transmitted through the transmitting antenna.
Further, in the high-precision synchronous data transmission device, the synchronization point information receiving module includes a 433MHz module, an intermediate frequency 80MHz module and a synchronization information decoding module, data received by the receiving antenna is transmitted to the baseband data module through the wireless mobile communication radio frequency module and the intermediate frequency 90MHz module, and is also transmitted to the synchronization information decoding module through the 433MHz module and the intermediate frequency 80MHz module.
In another aspect of the present invention, a high-precision synchronous data transmission method is further provided, which uses the high-precision synchronous data transmission apparatus as described above to perform data transmission, including the steps of:
the method comprises the following steps: through the movement and the adsorption of a vehicle-mounted outdoor active system, a virtual cell downlink transmitting module and a virtual cell uplink receiving module of the outdoor active system establish a communication link with a target, and the virtual cell downlink transmitting module transmits an uplink target identifier and synchronization point position information to a synchronization point information transmitting module;
step two: the indoor energy detection system enters a building where a target is located, the cell downlink receiving module analyzes the virtual cell downlink transmitting module signal to obtain a cell parameter, an uplink target identifier and a synchronization point position, if the cell parameter analyzed by the cell downlink receiving module is equal to the cell parameter of the virtual cell of the outdoor active system, the uplink signal source processing module utilizes the cell downlink receiving module to analyze the uplink target identifier and the synchronization point position obtained by the virtual cell transmitting module signal to calculate the uplink energy of the target signal source; otherwise, calculating the uplink energy of the target signal source by using the uplink target identification and the synchronization point position information acquired by the synchronization point information receiving module from the synchronization point information transmitting module so as to determine the accurate position of the target.
Further, in the high-precision synchronous data transmission method, the step of acquiring the uplink target identifier and the synchronization point position information from the synchronization point information transmitting module by the synchronization point information receiving module includes:
the virtual cell downlink transmitting module constructs virtual cell parameters in the baseband data module through channel coding and modulation steps, and transmits the synchronization point position and the uplink target identification in the baseband data module to a synchronization information coding module in the synchronization point information transmitting module;
the synchronous information coding module codes the special identifier, the system number, the position of the synchronous point and the uplink scrambling code and spreads the special identifier, the system number, the position of the synchronous point and the uplink scrambling code together with pilot frequency through 24-bit CRC coding, 1/2 convolutional coding, QPSK modulation;
the synchronous information coding module passes through the DAC to reach an intermediate frequency 80MHz module;
modulating the signal into a 433MHz module through a radio frequency circuit;
the baseband data module combines the virtual cell parameters with the synchronization point position and the uplink target identification from the 433MHz module through the intermediate frequency 90MHz module and the wireless mobile communication radio frequency module to obtain a sending signal;
the transmitting signal is transmitted out through a transmitting antenna;
receiving the transmission signal through a receiving antenna;
a wireless mobile communication radio frequency receiving module in the receiving antenna separates a wireless mobile communication signal and a synchronous signal in a sending signal on frequency through a filter, and the receiving frequency of the synchronous signal is 433 MHz;
the synchronous signal is demodulated into an intermediate frequency 80MHz module from a 433MHz module through a radio frequency circuit;
the synchronous signal is converted into zero frequency in an intermediate frequency 90MHz module through an ADC (analog to digital converter), and is transmitted to the baseband data module;
the synchronous information decoding module decodes the synchronous signals from the intermediate frequency 80MHz module, firstly despreads, utilizes pilot frequency to carry out channel estimation, QPSK demodulation, 1/2 convolution decoding and CRC decoding to obtain a special identifier, a system number, a synchronous point position and an uplink scrambling code;
and transmitting the synchronous information obtained by decoding to an uplink signal source processing module.
Further, in the high-precision synchronous data transmission method, if the analyzed special symbol identifier is consistent with the sent special symbol identifier, the data is valid data.
Further, in the high-precision synchronous data transmission method, the virtual cell parameters include a location area code LAC and a cell identifier CID.
Compared with the prior art, the invention has the following beneficial effects: if the cell downlink receiving module cannot analyze the virtual cell parameters, the uplink signal source processing module calculates the uplink energy of the target signal source by using the uplink target identifier and the synchronization point position information acquired by the synchronization point information receiving module to determine the accurate position of the target, otherwise, the cell downlink receiving module analyzes the communication link between the virtual cell downlink transmitting module and the target to acquire the uplink target identifier and the synchronization point position, so that the problem that the indoor energy detection equipment has an outdoor blind area can be effectively solved, and the effective target detection distance is increased.
Drawings
FIG. 1 is a schematic structural diagram of a high-precision synchronous data transmission device according to the present invention;
FIG. 2 is a schematic structural diagram of a transmitter module according to the present invention;
FIG. 3 is a schematic structural diagram of a receiving module according to the present invention;
FIG. 4 is a flow chart of a process of a synchronization information encoding module according to the present invention;
FIG. 5 is a flow chart of the process of the synchronization information decoding module according to the present invention.
Detailed Description
The high precision synchronous data transmission apparatus and method of the present invention will now be described in more detail with reference to the schematic drawings, in which preferred embodiments of the present invention are shown, it being understood that those skilled in the art can modify the invention herein described while still achieving the advantageous effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
In this embodiment, a high-precision synchronous data transmission device is provided, including: the system comprises an outdoor active system 1 and an indoor energy detection system 2, wherein the outdoor active system 1 comprises a transmitting module 10 and a virtual cell uplink receiving module 103, the transmitting module 10 comprises a synchronization point information transmitting module 101 and a virtual cell downlink transmitting module 102 which performs uplink target identification and synchronization point position information transmission with the synchronization point information transmitting module 101, the indoor energy detection system 2 comprises a receiving module 20 and an uplink signal source processing module 203, and the receiving module 20 comprises a synchronization information receiving module 201 and a cell downlink receiving module 202; the synchronization point information transmitting module 101 communicates with the synchronization information receiving module 201; the virtual cell downlink transmitting module 102 communicates with the cell downlink receiving module 202, the synchronization point information transmitting module 101 communicates with the synchronization point information receiving module 201, and the virtual cell downlink transmitting module 102 and the cell uplink receiving module 103 perform data interaction; the synchronization information receiving module 201 and the cell downlink receiving module 202 are respectively in communication with the uplink signal source processing module 203; the virtual cell downlink transmitting module 102 and the virtual cell uplink receiving module 103 establish communication connection with a target.
The application scenarios and interactions of the present invention are shown in fig. 1: a virtual cell downlink transmitting module 102 and a virtual cell Uplink receiving module 103 in the outdoor active system 1 establish a communication link with the target 3, and the virtual cell downlink transmitting module 102 transmits an Uplink target identifier and synchronization point position information to the Uplink signal source processing module 103, where the Uplink target identifier is, for example, a WCDMA (Wideband Code Division Multiple Access) Uplink scrambling Code and an LTE (Long Term Evolution) resource length of a PUSCH (Physical Uplink Shared Channel) and Uplink reference signal information. When the outdoor active system 1 is attached to the target 3 and establishes a communication link, the location of the building in which the target 3 is located is substantially determined. The indoor energy detection system 2 enters a building, and the cell downlink receiving module 202 analyzes the signal of the virtual cell downlink transmitting module 102.
As mentioned in the background art, when the cell downlink receiving module 202 cannot analyze the signal of the virtual cell downlink transmitting module 102, the uplink signal source processing module 203 calculates the uplink energy of the target signal source by using the uplink target identifier and the synchronization point position information acquired by the synchronization point information receiving module 201 to determine the target accurate position.
In this embodiment, the transmitting module 10 further includes a transmitting antenna a0, the receiving module 20 further includes a receiving antenna b0, the transmitting module 10 sends data to the receiving antenna b0 through the transmitting antenna a0, and the receiving antenna b0 transmits the data to the receiving module 20.
Referring to fig. 2, the virtual cell downlink transmitting module 102 includes a baseband data module a13 and a synchronization information encoding module a 23; the virtual cell downlink transmitting module 102 includes a baseband data module a13, an intermediate frequency 90MHz module a12, and a wireless mobile communication rf module a11, the synchronization point information transmitting module 101 includes a synchronization information encoding module a23, an intermediate frequency 80MHz module a22, and a 433MHz module a21, wherein the baseband data module a13 transmits data to the intermediate frequency 90MHz module a12, and then transmits the data to the wireless mobile communication rf module a11, the synchronization information encoding module a23 transmits data to the intermediate frequency 80MHz module a22, and then transmits the data to the 433MHz module a21, the baseband data module a13 transmits an uplink target identifier and synchronization point position information to the synchronization information encoding module a23, and the data in the wireless mobile communication rf modules a11 and 433MHz module a21 are transmitted through the transmitting antenna a 0.
Similarly, referring to fig. 3, the synchronization information receiving module 201 includes a 433MHz module b21, an intermediate frequency 80MHz module b22, and a synchronization information decoding module b23, the cell downlink receiving module 202 includes a wireless mobile communication rf module b11, an intermediate frequency 90MHz module b12, and a baseband data module b13, data received by the receiving antenna b0 is transmitted to the baseband data module b13 through the wireless mobile communication rf module b11 and the intermediate frequency 90MHz module b12, and is also transmitted to the synchronization information decoding module b23 through the 433MHz module b21 and the intermediate frequency 80MHz module b 22.
In another aspect of this embodiment, a high-precision synchronous data transmission method is further provided, where the high-precision synchronous data transmission device is used for data transmission, and the method includes the steps of:
the method comprises the following steps: through the movement and the adsorption of the vehicle-mounted outdoor active system, a virtual cell downlink transmitting module 102 and a virtual cell uplink receiving module 103 of the outdoor active system 1 establish a communication link with a target 3, and the virtual cell downlink transmitting module 102 transmits an uplink target identifier and synchronization point position information to a synchronization point information transmitting module 101;
step two: the indoor energy detection system 2 enters a building where the target is located, the cell downlink receiving module 202 analyzes the virtual cell downlink transmitting module 102 signal to obtain a cell parameter, an uplink target identifier and a synchronization point position, if the cell parameter analyzed by the cell downlink receiving module 202 is equal to the cell parameter of the virtual cell of the outdoor active system 1, the uplink signal source processing module 203 calculates the uplink energy of the target signal source by utilizing the cell downlink receiving module 202 to analyze the uplink target identifier and the synchronization point position obtained by the virtual cell transmitting module 102 signal; otherwise, the uplink signal source processing module 203 calculates the uplink energy of the target signal source by using the uplink target identifier and the synchronization point location information acquired by the synchronization point information receiving module 201 from the synchronization point information transmitting module 101, so as to determine the accurate location of the target.
Specifically, the virtual cell parameter includes a location area code LAC and a cell identifier CID. The synchronization point information receiving module 201 acquiring the uplink target identifier and the synchronization point position information from the synchronization point information transmitting module 101 includes the steps of:
in this embodiment, the virtual cell downlink transmitting module 102 constructs virtual cell parameters through steps of channel coding, modulation, and the like in the baseband data module a13, and transmits the synchronization point position and the uplink target identifier in the baseband data module a13 to the synchronization information coding module a23 in the synchronization point information transmitting module 101;
the synchronization information encoding module a23 encodes, the encoding process is as shown in fig. 4, the special identifier, the system number, the position of the synchronization point and the uplink scrambling code pass through 24-bit Cyclic Redundancy Check (CRC) encoding, 1/2 convolutional encoding, QPSK modulation and pilot frequency together spread spectrum; the step is carried out in a system chip, an interface between the chip and the radio frequency is communicated in real time through a control word command, the problem of time delay caused by the fact that a traditional data transmission module adopts an SPI (serial peripheral interface) interface is solved, and a powerful basis is provided for energy detection of a signal source in real time;
the synchronous information coding module a23 goes through DAC (Digital to analog converter) to the intermediate frequency 80MHz module a 22; modulating the signals into a 433MHz module a21 through a radio frequency circuit; the baseband data module transmits data to the intermediate frequency 90MHz module and then to the wireless mobile communication radio frequency module; finally, the downlink transmitting signal and the synchronization point information transmitting signal of the virtual cell are transmitted out through a transmitting antenna a 0;
receiving a wireless signal through a receiving antenna b 0;
the radio frequency receiving module b1 separates the wireless mobile communication signal and the synchronous signal in frequency through a filter; the receiving frequency of the synchronous signal is 433 MHz;
the synchronous signal is demodulated from a 433MHz module b21 to an intermediate frequency 80MHz module b22 through a radio frequency circuit;
the synchronous signal is converted to zero frequency in an intermediate frequency 80MHz module through an ADC (Analog-to-digital converter);
the synchronization information decoding module b23 decodes, and the flow is as shown in fig. 5, and first, despreads, performs channel estimation by using pilot frequency, QPSK demodulation, 1/2 convolutional decoding, and decodes CRC to obtain a special identifier, a system number, a synchronization point position, and an uplink scrambling code; if the analyzed special symbol mark is consistent with the sent special symbol mark, the data is valid data;
the decoded synchronization information is transmitted to the uplink signal source processing module 203.
From the above, the technology of the present application has the following advantages:
1. the 433MHz module a21 adopts low power 1W power amplifier to amplify the signal, because the frequency of the module is much lower than that of the wireless mobile communication system when the module works at 433MHz, the transmission loss is much lower during the transmission process. Since partial power is allocated to the pilot channel for channel estimation in the wireless mobile communication system, the synchronization point information reception module 201 can still analyze the synchronization information even when the cell reception module 202 does not analyze the virtual cell information in the reception module 20. The problem that outdoor blind areas exist in indoor energy detection equipment is effectively solved, and the effective target detection distance is increased.
2. The invention can be applied to various wireless mobile communication network standards according to the requirements of different network standard identifications.
3. The synchronization point information transmitting module and the synchronization point information receiving module are controlled and processed by utilizing the original control chip of the system, and the problem of time delay of the original data transmission module SPI is solved.
4. The system crystal oscillator is utilized, and compared with the traditional data transmission module crystal oscillator, the system crystal oscillator has the advantages of good performance, high stability and small drift.
5. The coding and modulation modes are adopted, the pilot frequency is utilized to carry out channel estimation, the error correction capability is improved, and the receiving sensitivity is improved by more than 5 db.
6. The spread spectrum mode is adopted, the spread spectrum code is freely selected, and the method can also be applied to application scenes with more transmission data.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A high precision synchronous data transmission device, comprising:
the indoor energy detection system comprises a receiving module and an uplink signal source processing module, wherein the receiving module comprises a synchronous information receiving module and a cell downlink receiving module in signal connection with the synchronous information receiving module;
the virtual cell downlink transmitting module and the virtual cell uplink receiving module are in communication connection with a target, and information interaction exists between the virtual cell downlink transmitting module and the virtual cell uplink receiving module;
the cell downlink receiving module analyzes the signal transmitted by the virtual cell downlink transmitting module, and information interaction exists between the synchronization point information transmitting module and the synchronization point information receiving module;
the synchronous information receiving module and the cell downlink receiving module are respectively communicated with the uplink signal source processing module;
the virtual cell downlink transmitting module transmits an uplink target identifier and synchronization point position information to the synchronization point information transmitting module;
when the cell downlink receiving module cannot analyze the virtual cell downlink transmitting module signal, the uplink signal source processing module calculates the uplink energy of the target signal source by using the uplink target identifier and the synchronization point position information acquired by the synchronization point information receiving module to determine the target accurate position.
2. The apparatus according to claim 1, wherein the transmitting module further comprises a transmitting antenna, the receiving module further comprises a receiving antenna, the transmitting module sends data to the receiving antenna through the transmitting antenna, and the receiving antenna transmits the data to the receiving module.
3. The high-precision synchronous data transmission device according to claim 2, wherein the virtual cell downlink transmission module includes a baseband data module, an intermediate frequency 90MHz module and a wireless mobile communication radio frequency module, and the synchronization point information transmission module includes a synchronization information coding module, an intermediate frequency 80MHz module and a 433MHz module; the base band data module transmits data to an intermediate frequency of 90MHz and then to a wireless mobile communication radio frequency module, the synchronous information coding module transmits data to an intermediate frequency of 80MHz and then to a 433MHz module, the base band data module sends an uplink target identifier and a synchronous point position to the synchronous information coding module, and the data in the wireless mobile communication radio frequency module and the 433MHz module are transmitted through the transmitting antenna.
4. The apparatus according to claim 3, wherein the synchronization point information receiving module comprises a 433MHz module, an intermediate frequency 80MHz module and a synchronization information decoding module, and the data received by the receiving antenna is transmitted to the baseband data module through the radio frequency module for wireless mobile communication and the intermediate frequency 90MHz module, and is further transmitted to the synchronization information decoding module through the 433MHz module and the intermediate frequency 80MHz module.
5. A high-precision synchronous data transmission method for performing data transmission using the high-precision synchronous data transmission apparatus as claimed in claim 4, comprising the steps of:
the method comprises the following steps: through the movement and the adsorption of a vehicle-mounted outdoor active system, a virtual cell downlink transmitting module and a virtual cell uplink receiving module of the outdoor active system establish a communication link with a target, and the virtual cell downlink transmitting module transmits an uplink target identifier and synchronization point position information to a synchronization point information transmitting module;
step two: the indoor energy detection system enters a building where a target is located, the cell downlink receiving module analyzes the virtual cell downlink transmitting module signal to obtain a cell parameter, an uplink target identifier and a synchronization point position, if the cell parameter analyzed by the cell downlink receiving module is equal to the cell parameter of the virtual cell of the outdoor active system, the uplink signal source processing module utilizes the cell downlink receiving module to analyze the uplink target identifier and the synchronization point position obtained by the virtual cell transmitting module signal to calculate the uplink energy of the target signal source; otherwise, calculating the uplink energy of the target signal source by using the uplink target identification and the synchronization point position information acquired by the synchronization point information receiving module from the synchronization point information transmitting module so as to determine the accurate position of the target.
6. The method as claimed in claim 5, wherein said synchronization point information receiving module obtaining uplink target id and synchronization point location information from said synchronization point information transmitting module comprises the steps of:
the virtual cell downlink transmitting module constructs virtual cell parameters in the baseband data module through channel coding and modulation steps, and transmits the synchronization point position and the uplink target identification in the baseband data module to a synchronization information coding module in the synchronization point information transmitting module;
the synchronous information coding module codes the special identifier, the system number, the position of the synchronous point and the uplink scrambling code and spreads the special identifier, the system number, the position of the synchronous point and the uplink scrambling code together with pilot frequency through 24-bit CRC coding, 1/2 convolutional coding, QPSK modulation;
the synchronous information coding module passes through the DAC to reach an intermediate frequency 80MHz module;
modulating the signal into a 433MHz module through a radio frequency circuit;
the baseband data module combines the virtual cell parameters with the synchronization point position and the uplink target identification from the 433MHz module through the intermediate frequency 90MHz module and the wireless mobile communication radio frequency module to obtain a sending signal;
the transmitting signal is transmitted out through a transmitting antenna;
receiving the transmission signal through a receiving antenna;
a wireless mobile communication radio frequency receiving module in the receiving antenna separates a wireless mobile communication signal and a synchronous signal in a sending signal on frequency through a filter, and the receiving frequency of the synchronous signal is 433 MHz;
the synchronous signal is demodulated into an intermediate frequency 80MHz module from a 433MHz module through a radio frequency circuit;
the synchronous signal is converted into zero frequency in an intermediate frequency 90MHz module through an ADC (analog to digital converter), and is transmitted to the baseband data module;
the synchronous information decoding module decodes the synchronous signals from the intermediate frequency 80MHz module, firstly despreads, utilizes pilot frequency to carry out channel estimation, QPSK demodulation, 1/2 convolution decoding and CRC decoding to obtain a special identifier, a system number, a synchronous point position and an uplink scrambling code;
and transmitting the synchronous information obtained by decoding to an uplink signal source processing module.
7. The method as claimed in claim 6, wherein the data is valid data if the parsed specific symbol id is identical to the transmitted specific symbol id.
8. The method of claim 5, wherein the virtual cell parameters include a Location Area Code (LAC) and a Cell Identification (CID).
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| CN107347180A (en) | 2017-11-14 |
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