CN107708146B - Method and device for measuring signal power of satellite terminal and satellite terminal - Google Patents
Method and device for measuring signal power of satellite terminal and satellite terminal Download PDFInfo
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- CN107708146B CN107708146B CN201710877730.3A CN201710877730A CN107708146B CN 107708146 B CN107708146 B CN 107708146B CN 201710877730 A CN201710877730 A CN 201710877730A CN 107708146 B CN107708146 B CN 107708146B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
Abstract
The invention provides a method and a device for measuring signal power by a satellite terminal and the satellite terminal, relating to the technical field of satellite communication, wherein the method comprises the following steps: the satellite terminal measures the signal power of m adjacent frequency points in each time sub-period of a switching period by taking the current moment as a starting point; when the total duration of the switching cycle is greater than T for the first timepWhen the frequency point is measured, the measurement of one group of n multiplied by m frequency points is completed, and the signal power measurement of the next group of frequency points is continued until all the frequency points to be measured are measured; the m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence; and determining the maximum value in the signal power measured by each frequency point as the power measurement value of the frequency point. The invention greatly accelerates the power measurement speed of the frequency points and can quickly measure the signal power of a large number of frequency points.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a method and a device for measuring signal power by a satellite terminal and the satellite terminal.
Background
In a satellite communication system, after a satellite terminal is powered on, the satellite terminal first searches system broadcast signals and then completes a network access registration process. After the registration is completed, the network side knows the existence of the terminal, and the terminal has the capability of normal communication in the network (receiving and dialing calls, receiving and sending short messages and the like). In a satellite communication system adopting a frequency division plus time division mode, system broadcast signals only exist in certain time slots of certain frequency points, and a terminal does not achieve time frequency synchronization with the system after being started for the first time and does not have any prior information about the frequency points of the broadcast signals, so that a searching means is needed for determining the frequency points of the broadcast signals.
There are two approaches to solving this problem: 1) the frequency point occupied by the broadcast signal is fixed, and the terminal can search the fixed frequency point after being started. But this makes the system design inflexible. 2) And after the terminal is started, the broadcast signals are searched on each frequency point one by one. However, when the frequency points of the satellite communication system are very large (for example, greater than 1000), the search process may be time-consuming, resulting in poor user experience.
Aiming at the problems existing in the network access registration after the conventional satellite terminal is started, an effective solution is not provided at present.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for a satellite terminal to measure signal power, and a satellite terminal, which can quickly measure signal powers of multiple frequency points.
In a first aspect, an embodiment of the present invention provides a method for a satellite terminal to measure signal power, where the satellite terminal is configured to receive signals of m adjacent frequency points simultaneously; duration T of a broadcast signal burstbIs divided into N time sub-periods, each time sub-period having a duration TbN; wherein n time sub-periods serve as a switching period; a broadcast signal is transmitted with a period Tp(ii) a The method comprises the following steps: the satellite terminal measures the signal power of m adjacent frequency points in each time sub-period of a switching period by taking the current moment as a starting point; when the total duration of the switching cycle is greater than T for the first timepWhen the frequency point is measured, the measurement of one group of n multiplied by m frequency points is completed, and the signal power measurement of the next group of frequency points is continued until all the frequency points to be measured are measured; the m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence; and determining the maximum value in the signal power measured by each frequency point as the power measurement value of the frequency point.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the step of measuring signal powers of m adjacent frequency points in each time sub-period of one switching period includes: at each TbSwitching the receiving frequency of the satellite terminal to a target frequency point in the/N time period, and measuringAnd the target frequency point and the signal power of m-1 frequency points adjacent to the target frequency point.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the method is applied to frequency point power measurement performed when a satellite terminal is turned on for the first time.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, further including: comparing the power measured values of the frequency points; and determining the frequency point with the maximum power measurement value as a broadcast signal frequency point.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, and further includes: and the satellite terminal records the frequency point of the broadcast signal.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, and further includes: the satellite terminal searches for the broadcast signal at the broadcast signal frequency point; and when the search is successful, the satellite terminal performs network access registration through the broadcast signal frequency point.
In a second aspect, an embodiment of the present invention further provides an apparatus for a satellite terminal to measure signal power, where the satellite terminal is configured to receive signals of m adjacent frequency points simultaneously; duration T of a broadcast signal burstbIs divided into N time sub-periods, each time sub-period having a duration TbN; wherein n time sub-periods serve as a switching period; a broadcast signal is transmitted with a period Tp(ii) a The method comprises the following steps: the measurement module is used for measuring the signal power of m adjacent frequency points in each time sub-period of a switching period by taking the current moment as a starting point by the satellite terminal; a cycle module for first time exceeding T when the total duration of the switching cycle is greater than TpWhen the frequency point is measured, the measurement of one group of n multiplied by m frequency points is completed, and the signal power measurement of the next group of frequency points is continued until all the frequency points to be measured are measured; the m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence; a power determining module for determining the maximum value in the signal power measured by each frequency point as the power of the frequency pointAnd (6) measuring the values.
With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the measurement module is further configured to: at each TbAnd switching the receiving frequency of the satellite terminal to a target frequency point in the/N time period, and measuring the signal power of the target frequency point and m-1 frequency points adjacent to the target frequency point.
In a third aspect, an embodiment of the present invention further provides a satellite terminal, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and when the processor executes the computer program, the method provided in the first aspect and one of the possible implementation manners thereof is implemented.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable medium having non-volatile program code executable by a processor, where the program code causes the processor to execute the method provided by the first aspect and one of its possible implementations.
The embodiment of the invention has the following beneficial effects: the method, the device and the satellite terminal for measuring the signal power of the satellite terminal provided by the embodiment of the invention are realized by the aid of the duration T of one broadcast signal burstbThe method comprises the steps that the frequency point measurement method is divided into N time sub-periods, the signal power of m adjacent frequency points is measured in each time sub-period of a switching period, when the total cyclic duration of the switching period is greater than Tp for the first time, the measurement of the group of frequency points is completed until the measurement of all frequency points to be measured is completed, and the maximum value in the signal power obtained by the measurement of each frequency point is determined as the power measurement value of the frequency point; compared with a simple method for measuring the signal power of each frequency point one by one, the method greatly accelerates the power measurement speed of the frequency points and can quickly measure the signal power of a large number of frequency points.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of periodic transmission of a system broadcast message according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for measuring signal power by a satellite terminal according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a receiving frequency of a handover terminal according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a receiving frequency of a handover terminal according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a received signal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for measuring signal power by a satellite terminal according to an embodiment of the present invention;
fig. 7 is a block diagram of a satellite terminal according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the network access registration effect of the terminal after being started up and searching on fixed frequency points or searching on each frequency point one by one after being started up is not ideal, and based on the method, the device and the satellite terminal for measuring the signal power of the satellite terminal provided by the embodiment of the invention, the signal power of a plurality of frequency points can be rapidly measured, so that the most possible broadcast frequency points can be rapidly determined, and the total time consumed for network access registration of the terminal is reduced.
In a satellite communication system employing a frequency division + time division system, system broadcast messages are broadcast periodically. Referring to the schematic diagram of the system broadcast message periodic transmission shown in fig. 1: the broadcast message being in burst form, every TpOccupied for time TbTime. In addition to the broadcast signal, there may be a service signal in the system, but the power of the broadcast signal is not less than the service signal. Therefore, the possible broadcast signals can be determined by measuring the power, and the signal with the largest power is most likely to be the broadcast signal, so that the power of the signal on each frequency point needs to be measured.
For the convenience of understanding the present embodiment, a detailed description will be first given of a method for measuring signal power by a satellite terminal disclosed in the present embodiment.
Example 1
Embodiment 1 of the present invention provides a method for a satellite terminal to measure signal power, where the satellite terminal is configured to receive signals of m adjacent frequency points simultaneously; duration T of a broadcast signal burstbIs divided into N time sub-periods, each time sub-period having a duration TbN; wherein n time sub-periods serve as a switching period; a broadcast signal is transmitted with a period Tp. N, N and m are both positive integers, N is less than or equal to N.
Fig. 2 is a schematic flow chart of a method for measuring signal power by a satellite terminal according to the present invention, which includes the following steps:
step S202, the satellite terminal measures the signal power of m adjacent frequency points in each time sub-period of a switching period by taking the current time as a starting point.
At each time sub-period TbWithin the range of/N, the signal power of m frequency points (m is more than or equal to 1) is measured, and each frequency point of m can be an adjacent frequency point. At each TbSwitching the receiving frequency of the satellite terminal to a target frequency point in the/N time periodAnd measuring the signal power of the target frequency point and m-1 frequency points adjacent to the target frequency point.
During the duration T of a broadcast signal burstbIs divided into N time sub-periods, different m adjacent frequency points can be measured from the 1 st section to the N-1 st section, and the m frequency points which are the same as the m frequency points measured from the 1 st section to the Nth section are changed, and the steps are repeated periodically; the period of the receiving frequency of the switching terminal is (N-1) Tband/N. It can be understood that, different m frequency points can be measured from the 1 st segment to the nth segment, and the m frequency points which are the same as the m frequency points measured from the n +1 th segment are measured again, and the above steps are repeated periodically; wherein N is a positive integer less than or equal to N.
Step S204, when the total duration of the switching cycle is greater than T for the first timepAnd then, finishing the measurement of one group of n multiplied by m frequency points, and continuing to measure the signal power of the next group of frequency points until all the frequency points to be measured are measured.
And m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence. When the total duration of the switching cycle is greater than T for the first timepWhen there is necessarily a Tbthe/N time period falls completely within the broadcast signal burst, during which time period the power of the broadcast signal burst is measured. For example, in the case of the above-mentioned N-1 segment cycle, after the reception frequency of the handover terminal is k periods
Can ensure that: if there is broadcast signal in one of the (N-1) × m frequency points, there is necessarily a Tbthe/N time period falls completely within the broadcast signal burst and the power of the broadcast signal burst is then measured during this time period. At k x (N-1) TbAnd in the/N time, measuring the power of each frequency point in (N-1) × m frequency points for k times, and taking the maximum value of the k times of measurement results as the power measurement value of the frequency point.
And step S206, determining the maximum value in the signal power measured by each frequency point as the power measurement value of the frequency point.
When the receiving frequency of the terminal is switched periodically, the power of a certain frequency point is measured for many times. And when the measurement time exceeds the transmission period of the broadcast signal, taking the maximum value of multiple measurements as the final power measurement value of the frequency point power.
The method for measuring the signal power of the satellite terminal provided by the embodiment of the invention is realized by the duration T of a broadcast signal burstbIs divided into N time sub-periods, the signal power of m frequency points is measured in each time sub-period of a switching period, when the total time of the switching period cycle is greater than T for the first timepThen, the measurement of the group of frequency points is completed until the measurement of all frequency points to be measured is completed, and the maximum value in the signal power obtained by the measurement of each frequency point is determined as the power measurement value of the frequency point; compared with a simple method for measuring the signal power of each frequency point one by one, the method greatly accelerates the power measurement speed of the frequency points and can quickly measure the signal power of a large number of frequency points.
Since the total number of frequency points in the system is fixed, the larger N and m are, the less time is required for completing the measurement of all frequency points. However, m is limited by the receiving bandwidth of the terminal, and N is limited by the switching time and the measurement accuracy of the receiving frequency of the terminal, so N and m cannot be too large, and need to be reasonably selected according to the actual system and terminal parameters.
The method for measuring the signal power of the satellite terminal can be applied to the frequency point power measurement when the satellite terminal is started for the first time. Further, the method further comprises: comparing the power measured values of the frequency points; and determining the frequency point with the maximum power measurement value as a broadcast signal frequency point. The satellite terminal can quickly measure the signal power of all frequency points of the system by using the method, and the frequency points with the maximum power are used as the most possible frequency points of the broadcast signals, and then the broadcast signals are preferentially searched on the frequency points. The method further comprises the following steps: the satellite terminal records the frequency points of the broadcast signals so as to search preferentially.
Further, the method further comprises: the satellite terminal searches for the broadcast signal at the broadcast signal frequency point; and when the search is successful, the satellite terminal performs network access registration through the broadcast signal frequency point.
The method for measuring the signal power of the satellite terminal provided by the embodiment of the invention can quickly measure the signal power of a large number of frequency points, and the frequency points with the maximum power are taken as the most possible frequency points of the broadcast signals, so that the time from the start-up of the terminal to the completion of the network access registration is greatly reduced.
Example 2
The embodiment 2 of the invention provides a method for measuring signal power by a satellite terminal, which is applied to a certain satellite communication system, and has the following signal system and broadcast signal characteristics:
in a satellite communication system, each frame is 40ms long and comprises 24 time slots, and each time slot is 5/3ms in length. The duration of the broadcast signal burst is 6 time slots. With one broadcast signal burst every 8 frames, i.e. Tp＝320ms，Tb10 ms. The symbol rate of the broadcast signal is Rs ═ 23.4kHz, and the bandwidth of the broadcast signal is B ═ 1.35Rs ═ 31.59 kHz.
The simplest and straightforward method is to search the broadcast signal for frequency points one by one, each frequency point requiring at least TpThe system has 1087 bins for 320ms, and 347.84s is required for 6 minutes for each traversal.
In this embodiment, N is 6, m is 1, that is, the terminal is configured to receive signals of only one frequency point at a time, and the sampling rate Fs used by the terminal is 4 Rs. Burst duration T of a broadcast signalbIs divided into N-6 small segments of length T for 10msband/N5/3 ms, which is exactly 1 slot.
As shown in fig. 3, the schematic diagram of switching the terminal receiving frequency is that the terminal receiving frequency is switched once every timeslot, and the power of one frequency point is measured. With 5 slots as one cycle, if the terminal reception frequency k is repeatedly switched to 39 cycles (195 slots in total, which is larger than 192 slots of the period of the broadcast signal), 39 measurements are performed for each frequency bin. If there is a broadcast signal on a certain frequency point, one of the 39 measurements must fall within the broadcast signal burst. For each frequency point, the maximum of 39 measurements is taken as the final power measurement for that frequency point.
At each short time Tbwhen/N is 5/3ms, leaving the first 5/9ms as the frequency switching time, the real time for measuring power is 10/9ms, corresponding to 104 sampling points. The power of the signal can be calculated in the time domain as follows:
i.e., the modulo sum of the I/Q data for 104 samples. Where the following table j indicates the measurement numbers, j ═ 1,2, … 39.
According to the method, the power of 5 frequency points can be measured every 325 ms. The system has 1087 frequency points, and 70.85 seconds are needed for completing the power measurement of all frequency points. Compared with a simple frequency point-by-frequency point measurement method, the speed is improved by about 5 times.
Example 3
Different from embodiment 2, in this embodiment, N is 6 and m is 5 are selected, that is, the terminal is configured to receive signals of m-5 adjacent frequency points simultaneously, and the sampling rate used by the terminal is Fs-4 m Rs. Broadcast signal burst duration TbIs divided into 6 segments with T each segmentband/N is 5/3 ms. The first 5/9ms is set aside for each small segment as the frequency switching time, and the real time for power measurement is 10/9 ms.
As shown in fig. 4, the schematic diagram of switching the receiving frequency of the terminal, the terminal measures the signals of the frequency points No. 1 to 5 for the first time, so the receiving frequency is set to be the frequency point No. 3, measures the signals of the frequency points No. 6 to 10 for the second time, so the receiving frequency is set to be the frequency point No. 8, and so on. Similarly, after the receiving frequency of the terminal is switched to 39 cycles, the maximum value of the 39 measurement values of each frequency point is taken as the power measurement result of the frequency point.
Since the terminal is configured to receive signals of m-5 frequency bins simultaneously, the sampling rate Fs-4 m Rs. The figure shows the case where the reception bandwidth is equal to 5 times the bandwidth of the broadcast signal, the reception bandwidth being mainly determined by the bandwidth of the analog filter of the radio front end of the terminal. Fig. 5 shows a schematic diagram of a received signal in which a terminal is configured to simultaneously receive 5 frequency points.
Taking a certain time for setting the receiving frequency of the terminal as a No. 3 frequency point as an example, respectively calculating the signal power of the No. 1 to No. 5 frequency points according to the following steps:
1. and obtaining I/Q data of a signal really used for measuring power, wherein the signal duration is 10/9ms, and the corresponding number of sampling points is 520.
2. Zero padding 520 samples to fflten 1024 points.
3. FFT is performed on the 1024-point complex signal, and a modulus is taken to obtain a power spectrum x (i) of the signal, wherein i is 0, 1. The frequency interval df is Fs/fftlen 457 Hz.
4. And respectively calculating the power of the signals of each frequency point, wherein each frequency point occupies 31.59kHz of bandwidth and corresponds to 69 continuous data of the frequency domain.
Frequency point 1 signal power:
frequency point 3 signal power:
where the subscript j denotes the measurement number, j ═ 1,2 … 39. And after the 39 measurements are completed, taking the maximum value of the 39 measurements as the power measurement value of the frequency point.
According to the method, the power of 25 frequency points can be measured every 325 ms. The system has 1087 frequency points in total, and it only takes 14.3 seconds to complete the power measurement of all frequency points. The speed is improved by 5 times compared with the method in the example 1. Compared with a simple frequency point-by-frequency point measurement method, the speed is improved by about 24 times.
The power measurement scheme of the above embodiment was simulated as follows. Taking m to 5, the power of 5 adjacent channels is measured from each time of sampling data. Only one of the 5 channels is a broadcast frequency point (the 3 rd frequency point), the frequency point has broadcast messages which are periodically broadcast, and the rest frequency points have no signals to be sent. The terminal measures power according to the method of the embodiment, the frequency point with the maximum measured power is judged as a broadcast signal frequency point, if the frequency point with the maximum power is the number 3 frequency point, the judgment is correct, and if the frequency point with the maximum power is wrong, the judgment is wrong. The simulation is carried out for 50000 times, the probability of judging errors is counted, and the result is recorded in table 1:
TABLE 1
Table 1 shows the relationship between the signal-to-noise ratio of the signal received by the terminal and the probability of a judgment error. It can be seen that the probability of a decision error decreases significantly as the signal-to-noise ratio increases. When the signal-to-noise ratio is higher than 4dB, the probability of judgment error is less than 2e-4. When the signal-to-noise ratio is higher than 5dB, no judgment error occurs in 50000 simulations.
Example 4
the measurement module 61 is used for measuring the signal power of m frequency points in each time sub-period of a switching period by taking the current moment as a starting point by the satellite terminal;
a cycle module 62 for first time cycling when the total duration of the switching period is greater than TpThen, a group of n x m frequency points are measuredContinuing to measure the signal power of the next group of frequency points until all the frequency points to be measured are measured; the m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence; n, N and m are both positive integers, N is less than or equal to N;
and a power determining module 63, configured to determine a maximum value in the signal powers measured at each frequency point as a power measurement value of the frequency point.
Further, the measurement module is further configured to: at each TbAnd switching the receiving frequency of the satellite terminal to a target frequency point in the/N time period, and measuring the signal power of the target frequency point and m-1 frequency points adjacent to the target frequency point.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus for measuring signal power by a satellite terminal described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
The embodiment of the present invention further provides a satellite terminal, which includes a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor implements the steps of the method in the above embodiment when executing the computer program.
Referring to fig. 7, an embodiment of the present invention further provides a satellite terminal 100, including: the processor 70, the memory 71, the bus 72 and the communication interface 73, wherein the processor 70, the communication interface 73 and the memory 71 are connected through the bus 72; the processor 70 is arranged to execute executable modules, such as computer programs, stored in the memory 71.
The Memory 71 may include a high-speed Random Access Memory (RAM) and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 73 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.
The bus 72 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 7, but this does not indicate only one bus or one type of bus.
The memory 71 is used for storing a program, and the processor 70 executes the program after receiving an execution instruction, and the method executed by the apparatus defined by the flow process disclosed in any of the foregoing embodiments of the present invention may be applied to the processor 70, or implemented by the processor 70.
The processor 70 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 70. The Processor 70 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory 71, and the processor 70 reads the information in the memory 71 and completes the steps of the method in combination with the hardware thereof.
The computer program product for performing the method for measuring signal power of the satellite terminal according to the embodiment of the present invention includes a computer-readable storage medium storing a nonvolatile program code executable by a processor, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, and will not be described herein again.
The above-described functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for a satellite terminal to measure signal power, characterized in that the satellite terminal is configured to receive m adjacent signals simultaneouslySignals of frequency points; duration T of a broadcast signal burstbIs divided into N time sub-periods, each time sub-period having a duration TbN; wherein n of said time sub-periods are taken as one switching period; a broadcast signal is transmitted with a period Tp(ii) a The method comprises the following steps:
the satellite terminal measures the signal power of m frequency points in each time sub-period of one switching period by taking the current moment as a starting point;
when the total duration of the switching cycle is greater than T for the first timepWhen the frequency point is measured, the measurement of one group of n multiplied by m frequency points is completed, and the signal power measurement of the next group of frequency points is continued until all the frequency points to be measured are measured; the m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence;
determining the maximum value in the signal power measured by each frequency point as the power measurement value of the frequency point;
the step of measuring the signal power of m frequency points in each time sub-period of one switching period includes:
at each TbAnd switching the receiving frequency of the satellite terminal to a target frequency point within a/N time period, and measuring the signal power of the target frequency point and m-1 frequency points adjacent to the target frequency point.
2. The method according to claim 1, wherein the method is applied to frequency point power measurement when the satellite terminal is first powered on.
3. The method of claim 1, further comprising:
comparing the power measured values of the frequency points;
and determining the frequency point with the maximum power measurement value as a broadcast signal frequency point.
4. The method of claim 3, further comprising: and the satellite terminal records the broadcast signal frequency point.
5. The method of claim 3, further comprising:
the satellite terminal searches for broadcast signals at the broadcast signal frequency points;
and when the search is successful, the satellite terminal performs network access registration through the broadcast signal frequency point.
6. An apparatus for measuring signal power by a satellite terminal, wherein the satellite terminal is configured to receive signals of m adjacent frequency points simultaneously; duration T of a broadcast signal burstbIs divided into N time sub-periods, each time sub-period having a duration TbN; wherein n of said time sub-periods are taken as one switching period; a broadcast signal is transmitted with a period Tp(ii) a The method comprises the following steps:
the measurement module is used for measuring the signal power of m adjacent frequency points in each time sub-period of one switching period by taking the current moment as a starting point by the satellite terminal;
a cycle module for first time exceeding T when the total duration of the switching cycle is greater than TpWhen the frequency point is measured, the measurement of one group of n multiplied by m frequency points is completed, and the signal power measurement of the next group of frequency points is continued until all the frequency points to be measured are measured; the m frequency points in each time sub-period of one switching period are frequency points extracted from the frequency points to be detected in sequence; n, N and m are both positive integers, N is less than or equal to N;
the power determining module is used for determining the maximum value in the signal power measured by each frequency point as the power measured value of the frequency point;
the measurement module is further configured to: at each TbAnd switching the receiving frequency of the satellite terminal to a target frequency point within a/N time period, and measuring the signal power of the target frequency point and m-1 frequency points adjacent to the target frequency point.
7. Satellite terminal comprising a memory, a processor, said memory having stored thereon a computer program operable on said processor, characterized in that said processor, when executing said computer program, is adapted to carry out the steps of the method according to any of the preceding claims 1 to 5.
8. A computer-readable medium having stored thereon non-volatile program code executable by a processor, the program code causing the processor to perform the method of any of claims 1-5.
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