CN109526003B - Method and device for detecting uplink signal of target terminal - Google Patents
Method and device for detecting uplink signal of target terminal Download PDFInfo
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- CN109526003B CN109526003B CN201810180684.6A CN201810180684A CN109526003B CN 109526003 B CN109526003 B CN 109526003B CN 201810180684 A CN201810180684 A CN 201810180684A CN 109526003 B CN109526003 B CN 109526003B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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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
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- 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
The invention relates to the field of communication, in particular to a method and a device for detecting an uplink signal of a target terminal, which are used for improving the positioning accuracy of the target terminal. The method comprises the following steps: the detection device detects an uplink signal sent by the target terminal by using a detection starting time point determined based on a first uplink timing advance time T1 used by the target terminal and taking Tcp as a period until the uplink signal is received, wherein Tcp is the time length of a cyclic prefix adopted when a network side interacts with the target terminal. Therefore, no matter how far the target terminal is away from the detection equipment and how long the propagation delay of the uplink signal is, the detection equipment can detect and completely receive the uplink signal sent by the target terminal in a certain Tcp cycle period, so that the uplink signal can be correctly analyzed, the measurement accuracy of the uplink PRB power of the target terminal is effectively improved, and the accurate positioning of the target terminal is further realized.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for detecting an uplink signal of a target terminal.
Background
In a Long Term Evolution (LTE) system, a passive positioning scheme is usually adopted to position a target terminal. The passive positioning scheme is that a target terminal performs normal communication with a network side, and a detecting device estimates a position of the target terminal by obtaining power of a Physical Resource Block (PRB) sent by the target terminal, so as to achieve a positioning purpose, and is specifically shown in fig. 1.
In order to know the power of the PRB transmitted by the target terminal, the sounding device needs to know the time-frequency resource information of the PRB transmitted by the target terminal, and needs to keep clock synchronization with the target terminal, so that the power of the PRB transmitted by the terminal can be detected at a specified time point and frequency.
Referring to fig. 2, the time domain structure of the LTE network is as follows: one slot (slot) is composed of a plurality of symbols (symbols), each symbol (denoted by l) being composed of a Cyclic Prefix (CP) and an available symbol time. The uplink uses a Single-carrier Frequency-Division Multiple Access symbol (SC-FDMA symbol), and the downlink uses an Orthogonal Frequency Division multiplexing symbol (OFDM symbol).
The number of symbols contained in a slot depends on the length of the cyclic prefix and the spacing of the subcarriers, and the cyclic prefix is divided into a normal cyclic prefix and an extended cyclic prefix, which are different in length. In practical application, except for a special subframe in Time Division Duplexing (TDD), when a normal subframe (including Frequency Division Duplexing (FDD) and TDD) uses a normal cyclic prefix (normal CP), each slot consists of 7 symbols (l is 0-6); when a normal subframe uses an extended cyclic prefix (extended CP), each slot consists of 6 symbols (l ═ 0 ~ 5).
After the target terminal and the LTE system obtain uplink synchronization, the detection equipment can detect the uplink signal of the target terminal within the time length not exceeding Tcp.
Referring to fig. 3, currently, in the LTE system, an uplink timing Advance (uplink timing Advance) mechanism is adopted for uplink transmission. The essence is that: receiving a negative offset (negative offset) between the start time of the downlink subframe and the time of transmitting the uplink subframe, the base station can control the time when the uplink signals from different target terminals arrive at the base station by appropriately controlling the negative offset of each target terminal. For a target terminal farther from the base station, due to a larger transmission delay, the uplink signal is transmitted earlier at a time point that is earlier than that of a target terminal closer to the base station. As shown in fig. 3, T1 represents the timing advance of the target terminal transmitting the uplink signal.
Currently, the detecting device adopts a Global Positioning System (Global Positioning System) and clocks of the target terminal to keep synchronous. The GPS belongs to a high-precision time service and positioning system, has strict requirements on the signal-to-noise ratio of each received satellite, and the GPS module on the current seen target terminal is used for positioning and navigation, has no requirement on the strength of the satellite, and can be used in a plurality of severe environments. Therefore, the sounding device cannot keep high-accuracy synchronization with the base station, and due to the uplink timing advance mechanism of the LTE system and the uncertainty of the distance between the sounding device and the target terminal, the sounding device cannot correctly analyze the uplink signal of the terminal, and thus cannot correctly detect the power of the target terminal.
The main problems arise in two ways:
in a first aspect: referring to fig. 4A, a time period required for an uplink signal sent by the target terminal to reach the detection device is greater than a sum of a time advance and an uplink cyclic prefix time period (i.e., > T1+ Tcp) adopted when the target terminal sends the uplink signal. In this case, since the detection device cannot know the duration of (T1+ Tcp), the detection process may not be started when the uplink signal arrives, and thus, the detection device cannot receive the complete uplink signal, and cannot correctly analyze the uplink signal, and further cannot correctly detect the power of the target terminal and accurately locate the target terminal.
In a second aspect: referring to fig. 4B, the time length required for the uplink signal sent by the target terminal to reach the detection device is smaller than the difference between the time advance and the uplink cyclic prefix time length (i.e., < T1-Tcp) when the target terminal sends the uplink signal. In this case, since the detecting device cannot know the duration of the (T1-Tcp), the detecting device may start the detection procedure too early before the uplink signal arrives, and thus the detecting device cannot receive the complete uplink signal, and cannot correctly analyze the uplink signal, and further cannot correctly detect the power of the target terminal and accurately locate the target terminal.
In view of the above, a new technical solution for detecting an uplink signal of a target terminal needs to be designed to overcome the above-mentioned drawbacks.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting an uplink signal of a target terminal, which are used for improving the positioning accuracy of a detection device on the target terminal in an LTE system.
The embodiment of the invention provides the following specific technical scheme:
a method for detecting an uplink signal of a target terminal comprises the following steps:
acquiring a first uplink timing time advance T1 configured by a network side for a target terminal;
determining a detection start time point based on the T1;
and detecting an uplink signal sent by the target terminal by taking a Tcp as a period from the detection starting time point until the uplink signal is received, wherein the Tcp is the time length of a cyclic prefix adopted when the network side interacts with the target terminal.
In the random access process of the target terminal, the T1 is obtained from the random access response sent by the network side; and/or the first and/or second light sources,
and when the target terminal is in a connected state, acquiring the T1 in a correction instruction sent by the network side.
Optionally, determining a detection start time point based on the T1 includes:
acquiring a current Global Positioning System (GPS) clock Tgps;
determining a time point Tgps' of next downlink signal transmission of the base station based on a preset period of downlink signal transmission of the base station;
the difference between Tgps' and T1 is taken as the detection start time point.
And taking the difference value of the Tgps and the T1 as the detection starting time point.
Optionally, after receiving the uplink signal, the method further includes:
analyzing the uplink signal and determining the signal transmitting power of the uplink signal;
and carrying out physical position positioning on the target terminal based on the signal transmitting power.
Optionally, after receiving the uplink signal, the method further includes:
determining a cycle sequence number N of a Tcp receiving the uplink signal;
and setting a second uplink timing time advance T2 corresponding to the target terminal based on N x Tcp.
Optionally, setting the T2 based on N × Tcp includes:
and taking N Tcp-preset time as the T2.
Optionally, further comprising:
and in the subsequent M times of continuous detection, detecting the uplink signal transmitted by the target terminal based on the T1, the T2 and the GPS clock, wherein M is a preset integer.
An apparatus for detecting an uplink signal of a target terminal, comprising:
an obtaining unit, configured to obtain a first uplink timing advance T1 configured by a network side for a target terminal;
a calculation unit configured to determine a detection start time point based on the T1;
the processing unit is used for detecting an uplink signal sent by a target terminal from the detection starting time point by taking a Tcp as a period until the uplink signal is received, wherein the Tcp is the time length of a cyclic prefix adopted when the network side interacts with the target terminal; in the random access process of the target terminal, the T1 is obtained from the random access response sent by the network side; or/and when the target terminal is in a connected state, acquiring the T1 from a correction instruction sent by the network side.
Optionally, when determining the detection start time point based on T1, the computing unit is configured to:
acquiring a current Global Positioning System (GPS) clock Tgps;
determining a time point Tgps' of next downlink signal transmission of the base station based on a preset period of downlink signal transmission of the base station;
the difference between Tgps' and T1 is taken as the detection start time point.
Optionally, after receiving the uplink signal, the processing unit is further configured to:
analyzing the uplink signal and determining the signal transmitting power of the uplink signal;
and carrying out physical position positioning on the target terminal based on the signal transmitting power.
Optionally, after receiving the uplink signal, the processing unit is further configured to:
determining a cycle sequence number N of a Tcp receiving the uplink signal;
and setting a second uplink timing time advance T2 corresponding to the target terminal based on N x Tcp.
Optionally, when setting the T2 based on N × Tcp, the processing unit is configured to:
and taking N Tcp-preset time as the T2.
Optionally, the processing unit is further configured to:
and in the subsequent M times of continuous detection, detecting the uplink signal transmitted by the target terminal based on the T1, the T2 and the GPS clock, wherein M is a preset integer.
In the embodiment of the present invention, a detection device determines a detection start time point based on a first uplink timing advance time amount T1 set by a network side for a target terminal, and detects an uplink signal sent by the target terminal from the detection start time point with a Tcp as a period until the uplink signal is received, where the Tcp is a time length of a cyclic prefix used when the network side interacts with the target terminal. Therefore, the Tcp is adopted for periodic cyclic check detection from the starting time point of the target terminal for sending the uplink signal, and the detection equipment can detect and completely receive the uplink signal sent by the target terminal in a certain Tcp cyclic period no matter how far the target terminal is away from the detection equipment and how long the propagation delay of the uplink signal is, so that the uplink signal can be correctly analyzed, the measurement accuracy of the uplink PRB power of the target terminal is effectively improved, and the accurate positioning of the target terminal is further realized.
Drawings
Fig. 1 is a schematic diagram illustrating a working environment of a detecting device in an LTE system according to the prior art;
FIG. 2 is a diagram of a frame structure of an LTE system in the prior art;
fig. 3 is a schematic diagram illustrating a working principle of an uplink timing advance mechanism adopted by a target terminal in the prior art;
fig. 4A and 4B are schematic diagrams illustrating a scenario in which a detecting device cannot correctly detect an uplink signal of a target terminal in the prior art;
fig. 5A is a schematic flow chart illustrating uplink signal detection performed by a detection device on a target terminal according to an embodiment of the present invention;
fig. 5B is a schematic diagram of an uplink timing advance indication structure in the embodiment of the present invention;
FIG. 5C is a schematic structural diagram of T1+ T2 in an embodiment of the present invention;
fig. 6A and fig. 6B are schematic diagrams illustrating a scenario in which a detecting device correctly detects an uplink signal of a target terminal according to an embodiment of the present invention;
fig. 7 is a functional structure diagram of a detection device according to an embodiment of the present invention.
Detailed Description
In the LTE system, in order to improve the positioning accuracy of the target terminal by the detection device, in the embodiment of the present invention, on the basis of the existing first uplink timing advance (T1), a concept of a second uplink timing advance (T2) is proposed, and an uplink signal test is performed on the target terminal under the cooperation of T1 and T2.
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 5A, in the embodiment of the present invention, a detailed process of detecting, by a detection device, an uplink signal sent by a target terminal is as follows:
step 500: the detecting device obtains a first uplink timing advance T1 configured by the network side for the target terminal.
In practical application, T1 is a parameter used by the base station on the network side to control the offset of each target terminal, and the base station can control the time when the uplink signal of the target terminal reaches the base station by using T1.
In the embodiment of the present invention, the base station sends T1 to the target terminal through an uplink Timing advance command (Timing advance command), and in this process, the detection device needs to keep clock synchronization with the base station through a GPS and detect a signal sent by the base station to obtain T1.
For example, the base station may determine a value of T1 by measuring a received Random Access preamble (preamble) in a Random Access process of the target terminal, and send a Timing Advance Command to the target terminal through a Random Access Response (RAR), and the sensing device may obtain T1 from the RAR in a Random Access detection process. The structural design of the RAR is shown in fig. 5B.
For another example, in the LTE protocol, in a Radio Resource control CONNECTED (RRC _ CONNECTED) state, if T1 of the target terminal needs to be corrected, the base station sends a Timing Advance Command to the target terminal through a correction Command, instructing the target terminal to adjust T1 to a latest value, and the detecting device obtains T1 from the correction Command.
Step 510: the detecting device determines a detection start time point based on the obtained T1.
Specifically, in the embodiment of the present invention, since the detecting device and the network side are synchronized based on the GPS clock, and the network side sends T1 to the target terminal based on the GPS clock, when step 510 is executed, the detecting device may first obtain the current GPS clock Tgps, determine a time point Tgps ' at which the base station sends the downlink signal next time based on a preset period during which the base station sends the downlink signal, and set the difference between Tgps ' and T1 as a detection start time point, that is, set the initial uplink clock of the detecting device to (Tgps ' -T1).
Step 520: the detection equipment detects an uplink signal sent by a target terminal from a detection time point by taking a Tcp as a period until the uplink signal is received, wherein the Tcp is the time length of a cyclic prefix adopted when a network side interacts with the target terminal.
Namely, the method of N Tcp is adopted, the uplink signal sent by the target terminal is circularly detected according to the method of increasing the time length multiple of Tcp,
further, once the detecting device detects the uplink signal of the target terminal in the nth Tcp, the detecting device receives the uplink signal, analyzes the received uplink signal, determines the signal transmitting power of the target terminal based on the analysis result, and finally locates the target terminal based on the signal transmitting power. N is not a preset value but a value determined after the uplink signal is detected, and N can be recorded as a corresponding value when the uplink signal is detected at the Tcp-th time.
On the other hand, in the embodiment of the present invention, N × Tcp-preset time period may be set as the second uplink timing time advance (T2) of the corresponding target terminal, and in M consecutive detections thereafter, the uplink signal sent by the target terminal is detected based on T1, T2 and the GPS clock.
Optionally, the preset time duration is at least one Tcp, because the nth Tcp is a time period for receiving the uplink signal of the target terminal, and if it is desired that the detection device can further narrow the time detection range in the next detection process, at least one Tcp needs to be advanced, and the detection starts at the latest at (N-1) × Tcp.
For example, as shown in fig. 5C, after setting T2, in the following 2 consecutive detection processes (assuming that M is 2), the sniffing device may start detecting the uplink signal of the target terminal at the time point Tgps-T1 + T2. The precondition for executing the operation is that the geographic position of the target terminal is relatively fixed and is kept in a fixed range within a certain time duration, so that after the T2 is set, in the subsequent detection process, the detection equipment can directly start to execute the detection at the time point of Tgps-T1 + T2 without repeatedly executing the detection in the N × Tcp mode, thereby further saving the detection time and reducing the detection load of the detection equipment.
Based on the above embodiment, referring to fig. 6A and 6B, with the above technical solution, no matter the time length required for the uplink signal sent by the target terminal to reach the detection device is greater than (T1+ Tcp) or less than (T1-Tcp), from the time of (Tgps' -T1), the cycle detection is performed with Tcp as a period, and the complete uplink signal can be accurately captured at the corresponding time point, so that the accurate analysis of the uplink signal can be realized.
Based on the above embodiments, referring to fig. 7, in an embodiment of the present invention, the detecting apparatus at least includes an obtaining unit 70, a calculating unit 71 and a processing unit 72, wherein,
an obtaining unit 70, configured to obtain a first uplink timing advance T1 configured by the network side for the target terminal;
a calculation unit 71 for determining a detection start time point based on the T1;
a processing unit 72, configured to detect, starting from the detection start time point, an uplink signal sent by the target terminal with a Tcp as a period until the uplink signal is received, where the Tcp is a duration of a cyclic prefix used when the network side interacts with the target terminal; wherein, the obtaining unit 70 obtains the T1 in a random access response sent by a network side in a random access process of a target terminal; or/and when the target terminal is in a connected state, acquiring the T1 from a correction instruction sent by the network side.
Optionally, when determining the detection start time point based on T1, the calculating unit 71 is configured to:
acquiring a current Global Positioning System (GPS) clock Tgps;
determining a time point Tgps' of next downlink signal transmission of the base station based on a preset period of downlink signal transmission of the base station;
the difference between Tgps' and T1 is taken as the detection start time point.
Optionally, after receiving the uplink signal, the processing unit 72 is further configured to:
analyzing the uplink signal and determining the signal transmitting power of the uplink signal;
and carrying out physical position positioning on the target terminal based on the signal transmitting power.
Optionally, after receiving the uplink signal, the processing unit 72 is further configured to:
determining a cycle sequence number N of a Tcp receiving the uplink signal;
and setting a second uplink timing time advance T2 corresponding to the target terminal based on N x Tcp.
When setting the T2 based on N × Tcp, the processing unit 72 is configured to:
and taking N Tcp-preset time as the T2.
Optionally, the processing unit 72 is further configured to:
and in the subsequent M times of continuous detection, detecting the uplink signal transmitted by the target terminal based on the T1, the T2 and the GPS clock, wherein M is a preset integer.
In summary, in the embodiment of the present invention, the detecting device determines the detection start time point based on the first uplink timing advance time amount T1 set by the network side for the target terminal, and detects the uplink signal sent by the target terminal with Tcp as a period from the detection start time point until the uplink signal is received, where Tcp is a duration of a cyclic prefix used when the network side interacts with the target terminal.
Therefore, the Tcp is adopted for periodic cyclic check detection from the starting time point of the target terminal for sending the uplink signal, and the detection equipment can detect and completely receive the uplink signal sent by the target terminal in a certain Tcp cyclic period no matter how far the target terminal is away from the detection equipment and how long the propagation delay of the uplink signal is, so that the uplink signal can be correctly analyzed, the measurement accuracy of the uplink PRB power of the target terminal is effectively improved, and the accurate positioning of the target terminal is further realized.
On the other hand, the technical scheme of the invention has small influence on the protocol, is easy to realize, effectively reduces the subsequent operation and maintenance difficulty, and is beneficial to wide popularization and application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments 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 encompass such modifications and variations.
Claims (10)
1. A method for detecting an uplink signal of a target terminal, comprising:
acquiring a first uplink timing time advance T1 configured by a network side for a target terminal;
determining a detection start time point based on the T1, including: acquiring a current Global Positioning System (GPS) clock Tgps, determining a time point Tgps 'of next downlink signal transmission of a base station based on a preset period of downlink signal transmission of the base station, and taking a difference value between the Tgps' and T1 as a detection starting time point;
starting from the detection starting time point, detecting an uplink signal sent by a target terminal by taking a Tcp as a period until the uplink signal is received, wherein the Tcp is the time length of a cyclic prefix adopted when a network side interacts with the target terminal; wherein the content of the first and second substances,
in the random access process of the target terminal, the T1 is obtained from the random access response sent by the network side; and/or the first and/or second light sources,
and when the target terminal is in a connected state, acquiring the T1 in a correction instruction sent by the network side.
2. The method of claim 1, wherein after receiving the uplink signal, further comprising:
analyzing the uplink signal and determining the signal transmitting power of the uplink signal;
and carrying out physical position positioning on the target terminal based on the signal transmitting power.
3. The method of claim 1, wherein after receiving the uplink signal, further comprising:
determining a cycle sequence number N of a Tcp receiving the uplink signal;
and setting a second uplink timing time advance T2 corresponding to the target terminal based on N x Tcp.
4. The method of claim 3, wherein setting the T2 based on N x Tcp comprises:
and taking N Tcp-preset time as the T2.
5. The method of claim 3, further comprising:
and in the subsequent M times of continuous detection, detecting the uplink signal transmitted by the target terminal based on the T1, the T2 and the GPS clock, wherein M is a preset integer.
6. An apparatus for detecting an uplink signal of a target terminal, comprising:
an obtaining unit, configured to obtain a first uplink timing advance T1 configured by a network side for a target terminal;
a calculating unit, configured to determine a detection start time point based on the T1, including: acquiring a current Global Positioning System (GPS) clock Tgps, determining a time point Tgps 'of next downlink signal transmission of a base station based on a preset period of downlink signal transmission of the base station, and taking a difference value between the Tgps' and T1 as a detection starting time point;
the processing unit is used for detecting an uplink signal sent by a target terminal from the detection starting time point by taking a Tcp as a period until the uplink signal is received, wherein the Tcp is the time length of a cyclic prefix adopted when the network side interacts with the target terminal; wherein the content of the first and second substances,
in the random access process of the target terminal, the T1 is obtained from the random access response sent by the network side; or/and when the target terminal is in a connected state, acquiring the T1 from a correction instruction sent by the network side.
7. The apparatus of claim 6, wherein after receiving the uplink signal, the processing unit is further to:
analyzing the uplink signal and determining the signal transmitting power of the uplink signal;
and carrying out physical position positioning on the target terminal based on the signal transmitting power.
8. The apparatus of claim 6, wherein after receiving the uplink signal, the processing unit is further to:
determining a cycle sequence number N of a Tcp receiving the uplink signal;
and setting a second uplink timing time advance T2 corresponding to the target terminal based on N x Tcp.
9. The apparatus of claim 8, wherein the processing unit, when setting the T2 based on ntcp, is to:
and taking N Tcp-preset time as the T2.
10. The apparatus as recited in claim 8, said processing unit to further:
and in the subsequent M times of continuous detection, detecting the uplink signal transmitted by the target terminal based on the T1, the T2 and the GPS clock, wherein M is a preset integer.
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