Power distribution method based on communication and distance measurement integrated link

Abstract

The invention relates to a communication and ranging integrated link-based power distribution method, which comprises the following steps of: embedding a carrier-to-noise ratio and a signal verification condition of a local receiving user signal into communication data, and adjusting a power ratio of a communication branch to a ranging branch in real time through a link state fed back by an opposite transceiver. Therefore, the two-way link can be reestablished under the condition that the link margin is insufficient.

Description

Technical Field

[0001] The present application relates to the field of space-time reference and navigation technology, and in particular, to a power allocation method based on a communication and ranging integrated link. Background Art

[0002] With the continuous development of communication technology, communication systems are required to provide services beyond communication functions, such as ranging and timing functions, in order to reduce the size and power consumption of the system, thereby reducing the cost of the system. Currently, integrated communication and ranging systems are common in satellite systems. By building satellite-to-ground links and inter-satellite links, satellite systems can monitor and estimate the orbit of a single satellite. One feature of a satellite system is that the location of users in the system is known (ground station) or the trajectory can be predicted (satellite). Therefore, the link state of the integrated communication and ranging link is relatively stable. Leaving enough margin in the design can ensure the long-term stable operation of the system.

[0003] However, for formation flying users and randomly moving ground users, the communication and ranging integrated link status of both is relatively complex. Environmental changes, antenna pointing, mutual movement, etc. will lead to increased link loss and affect the communication of the system. In order to ensure the communication function of the communication and ranging integrated system, it is necessary to optimize the communication and ranging integrated system. The current research direction focuses on studying receiving algorithms with lower receiving sensitivity and designing waveforms that take into account both timing and ranging functions and communication functions. However, the two-way communication and ranging integrated system has the problem of time-varying link loss or insufficient link margin. Summary of the invention

[0004] In order to overcome at least one deficiency in the prior art, the present application provides a power allocation method based on a communication and ranging integrated link.

[0005] In a first aspect, a power allocation method based on a communication and ranging integrated link is provided, comprising:

[0006] Determine the link state, which includes one of five link states, namely, state 1, state 2, state 3, state 4, and state 5;

[0007] State 1 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the carrier-to-noise ratio estimation of the other party's transceiver meets the link design;

[0008] State 2 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the carrier-to-noise ratio estimation of the other party's transceiver does not meet the link design;

[0009] State 3 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the other party's transceiver's reception abnormal time does not exceed the rated value;

[0010] State 4 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the other party's transceiver's reception abnormal time exceeds the rated value;

[0011] State 5 means: the local transceiver cannot receive the parsed communication ranging signal;

[0012] When the link state is state 1, the default ranging branch signal mapping value is restored and the next link establishment cycle begins;

[0013] When the link state is state 2, state 3 or state 5, the current ranging branch signal mapping value is maintained and the next link establishment cycle is started;

[0014] When the link state is state 4, the power ratio of the communication branch and the ranging branch is adjusted according to the carrier-to-noise ratio estimation of the other party's transceiver, and the next link establishment cycle begins.

[0015] In one embodiment, adjusting the ranging branch signal mapping value according to the carrier-to-noise ratio estimation of the other transceiver to adjust the power ratio of the communication branch and the ranging branch includes:

[0016] Analyze the carrier-to-noise ratio (C / N) of the communication branch estimated by the other party's transceiver 0S :

[0017] C / N 0S =C / N 0C +10log 10 (I)

[0018]

[0019] Among them, C / N 0C is the signal-to-noise ratio of the ranging branch estimated by the other transceiver, I is the power ratio between the communication branch and the ranging branch, P S is the communication branch power, P C is the ranging branch power; M is the communication branch mapping factor, n is the ranging branch mapping factor, P H is the power of the combined signal of the communication branch and the ranging branch;

[0020] According to the carrier-to-noise ratio C / N of the communication branch of the other transceiver 0S And the theoretical carrier-to-noise ratio, determine the power adjustment value ΔP:

[0021]

[0022] Among them, C / N 0e is the theoretical carrier-to-noise ratio, l0 is the reserved link margin;

[0023] The adjustment amount of the ranging branch signal mapping value is determined according to the power adjustment value ΔP, and the ranging branch signal mapping value is adjusted according to the adjustment amount of the ranging branch signal mapping value to obtain the adjusted ranging branch signal mapping value n p ; Adjusted ranging branch signal mapping value n p The distance measurement branch mapping value n before adjustment l The following formula is satisfied:

[0024]

[0025] In one embodiment, the method further includes: in the initial link establishment phase, adjusting the signal mapping value of the ranging branch to a default value.

[0026] Compared with the prior art, the present application has the following beneficial effects: the power allocation method based on the integrated communication and ranging link of the present application includes the carrier-to-noise ratio and signal verification status of the locally received user signal in the communication data, and adjusts the power ratio of the communication branch and the ranging branch in real time through the link status fed back by the other party's transceiver, thereby realizing the reconstruction of the bidirectional link when the link margin is insufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present application may be better understood by referring to the following description given in conjunction with the accompanying drawings, which together with the following detailed description are included in this specification and form a part of this specification. In the drawings:

[0028] Figure 1 A schematic diagram of link status analysis is shown;

[0029] Figure 2 A schematic diagram of the transmitting part of the integrated transceiver for ranging communication is shown. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that many implementation-specific decisions can be made in the process of developing any such actual embodiments in order to achieve the specific goals of the developer, and these decisions may vary from embodiment to embodiment.

[0031] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure closely related to the scheme according to the present application is shown in the drawings, while other details that are not closely related to the present application are omitted.

[0032] It should be understood that the present application is not limited to the described implementation forms due to the following description with reference to the accompanying drawings. In this article, where feasible, the embodiments can be combined with each other, features between different embodiments can be replaced or borrowed, and one or more features can be omitted in one embodiment.

[0033] The present application provides a power allocation method based on a communication and ranging integrated link, the method comprising:

[0034] Step S1, determining the link state, the link state includes one of five link states, and the five link states are state 1, state 2, state 3, state 4, and state 5. Figure 1 A schematic diagram of link status analysis is shown.

[0035] Here, based on the link information transmitted by the communication link, the carrier-to-noise ratio and signal verification status of the local received user signal are interpolated into the communication signal, and the link status is interacted in real time via the two-way communication link. The real-time status of the link is divided into five types. The carrier-to-noise ratio of the local received user signal refers to the carrier-to-noise ratio of the ranging branch signal estimated by the receiver, and the signal verification status refers to whether the information of the communication branch and the ranging branch can be correctly parsed, that is, whether the current link status group meets the link budget.

[0036] State 1 means that the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the carrier-to-noise ratio estimation of the other party's transceiver meets the link design.

[0037] State 1 indicates that the current two-way communication and ranging integrated link is communicating normally, and the local transmission subsystem is normal, meeting the system design requirements. At this time, the power allocation of the communication branch and the ranging branch follows the system default value. State 1 is the normal working mode of the two-way communication and ranging integrated system.

[0038] State 2 means that the local transceiver can receive and resolve the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the carrier-to-noise ratio estimation of the other party's transceiver does not meet the link design.

[0039] In state 2, the attenuation of the transmission link is higher than the system expectation, but in this case, the link can still be established normally. This means that the link budget of the transmission link at this time no longer meets the system design requirements, but the power allocation of the current communication branch and ranging branch can meet the communication requirements of the link, so the current ranging branch signal mapping value is maintained.

[0040] State 3 means that the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the reception abnormality time of the other party's transceiver does not exceed the rated value.

[0041] The rated value can be set as the capture time. This state may be caused by the first link establishment or a temporary link interruption due to some reason. In order to avoid the current interruption being a temporary interruption, the ranging branch signal mapping value is not changed in this state. When the link is first established, the ranging branch signal mapping value is the default value.

[0042] State 4 means that the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the reception abnormality time of the other party's transceiver exceeds the rated value.

[0043] State 4 indicates that the carrier-to-noise ratio estimation of the communication branch does not meet the link budget. At this time, it is necessary to reduce the ranging branch signal mapping value according to the carrier-to-noise ratio of the other party's transceiver to meet the link requirements.

[0044] State 5 means that the local transceiver cannot receive and resolve the communication ranging signal.

[0045] State 5 indicates that the receiving link is abnormal. When the receiving time slot fails to receive the link establishment user information, it may be due to link blocking or system reasons that cause the link to be interrupted or the link attenuation is too large. At this time, changing the local power allocation cannot improve the communication link. In the next transmission time slot, the current power ratio is kept unchanged, and the abnormal situation is recorded and reported to the upper device.

[0046] Step S2, when the link state is state 1, restore the default ranging branch signal mapping value and start the next link establishment cycle;

[0047] When the link state is state 2, state 3 or state 5, the current ranging branch signal mapping value is maintained and the next link establishment cycle is started;

[0048] When the link state is state 4, the ranging branch signal mapping value is adjusted according to the carrier-to-noise ratio estimation of the other party's transceiver to adjust the power ratio of the communication branch and the ranging branch, and the next link establishment cycle begins.

[0049] Specifically, adjusting the ranging branch signal mapping value according to the carrier-to-noise ratio estimation of the other party's transceiver to adjust the power ratio of the communication branch and the ranging branch includes:

[0050] First, analyze the carrier-to-noise ratio (C / N) of the communication branch estimated by the other party's transceiver. 0S In current transceivers, the ranging branch is usually used to estimate the carrier-to-noise ratio. If the system can directly transmit the carrier-to-noise ratio of the communication branch, this step can be omitted:

[0051] C / N 0S =C / N 0C +10log 10 (I)

[0052]

[0053] Since the antenna works at the saturation point, its transmission power has nothing to do with the power of the combined signal of the communication branch and the ranging branch:

[0054]

[0055] Among them, C / N 0C is the signal-to-noise ratio of the ranging branch estimated by the other transceiver, I is the power ratio between the communication branch and the ranging branch, P S is the communication branch power, P C is the ranging branch power; M is the communication branch mapping factor, which is a fixed value; n is the ranging branch mapping factor, which is a configurable parameter, P H is the power of the combined signal of the communication branch and the ranging branch;

[0056] Then, according to the carrier-to-noise ratio C / N of the communication branch of the other transceiver, 0S and theoretical carrier-to-noise ratio, determine the power adjustment value ΔP, which is the power that needs to be increased for the current communication branch:

[0057]

[0058] Among them, C / N 0e is the theoretical carrier-to-noise ratio, l0 is the reserved link margin, which can be set to a fixed value according to the system environment;

[0059] Then, the adjustment amount of the ranging branch signal mapping value is determined according to the power adjustment value ΔP, and the ranging branch signal mapping value is adjusted according to the adjustment amount of the ranging branch signal mapping value to obtain the adjusted ranging branch signal mapping value n p ; Adjusted ranging branch signal mapping value n p The distance measurement branch mapping value n before adjustment l The following formula is satisfied:

[0060]

[0061] Here, the mapping value adjustment amount needs to be protected to ensure that the signal-to-noise ratio of the ranging branch meets the system requirements, that is, n p Make a lower limit to ensure that the communication of the ranging branch will not be affected during the adjustment process.

[0062] Figure 2The schematic diagram of the transmitting part of the integrated ranging communication transceiver is shown. The communication branch and ranging branch of the communication ranging transceiver are framed separately, where the signal amplitude of the ranging branch is determined by the mapping value, while the signal amplitude of the communication branch is fixed. By changing the amplitude ratio of the ranging branch and the communication branch, the power ratio of the communication branch and the ranging branch can be changed. The two signals are QPSK modulated in the digital domain. The modulated signals enter the phased array antenna after frequency conversion and amplification through the RF channel. The phased array antenna sends the signal to the other transceiver according to the predicted angle. Because the output power of the RF channel is at the saturation operating point of the phased array antenna, the amplitude ratio adjustment of the communication branch and the ranging branch in the digital domain will not affect the total power of the transmitted signal, and the power ratio of the transmitted signal is determined by the signal amplitude ratio in the digital domain.

[0063] In one embodiment, in the initial link establishment stage, the signal mapping value of the ranging branch is adjusted to a default value.

[0064] In summary, the present application has the following technical effects: the power allocation method based on the integrated communication and ranging link of the present application embeds the carrier-to-noise ratio and signal verification status of the local received user signal in the communication data, and adjusts the power ratio of the communication branch and the ranging branch in real time through the link status feedback from the other party's transceiver, thereby realizing the reconstruction of the bidirectional link when the link margin is insufficient.

[0065] The above are only various implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power allocation method based on a communication and ranging integrated link, characterized in that: include: Determine a link state, where the link state includes one of five link states, where the five link states are state 1, state 2, state 3, state 4, and state 5; State 1 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the carrier-to-noise ratio estimation of the other party's transceiver meets the link design; State 2 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the carrier-to-noise ratio estimation of the other party's transceiver does not meet the link design; State 3 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the other party's transceiver's reception abnormal time does not exceed the rated value; State 4 means: the local transceiver can receive and analyze the communication ranging signal, and the other party's transceiver can correctly receive the communication data, and the other party's transceiver's reception abnormal time exceeds the rated value; State 5 means: the local transceiver cannot receive the parsed communication ranging signal; When the link state is state 1, the default ranging branch signal mapping value is restored and the next link establishment cycle begins; When the link state is state 2, state 3 or state 5, the current ranging branch signal mapping value is maintained and the next link establishment cycle is started; When the link state is state 4, the power ratio of the communication branch and the ranging branch is adjusted according to the carrier-to-noise ratio estimation of the other party's transceiver, and the next link establishment cycle begins.

2. The method according to claim 1, characterized in that in, The ranging branch signal mapping value is adjusted according to the carrier-to-noise ratio estimation of the other party's transceiver to adjust the power ratio of the communication branch and the ranging branch, including: Analyze the carrier-to-noise ratio (C / N) of the communication branch estimated by the other party's transceiver 0S : C / N 0S =C / N 0C +10log 10 (I) Among them, C / N 0C is the signal-to-noise ratio of the ranging branch estimated by the other transceiver, I is the power ratio between the communication branch and the ranging branch, P S is the communication branch power, P C is the ranging branch power; M is the communication branch mapping factor, n is the ranging branch mapping factor, P H is the power of the combined signal of the communication branch and the ranging branch; According to the carrier-to-noise ratio C / N of the communication branch of the other transceiver 0S And the theoretical carrier-to-noise ratio, determine the power adjustment value ΔP: Among them, C / N 0e is the theoretical carrier-to-noise ratio, l0 is the reserved link margin; The adjustment amount of the ranging branch signal mapping value is determined according to the power adjustment value ΔP, and the ranging branch signal mapping value is adjusted according to the adjustment amount of the ranging branch signal mapping value to obtain the adjusted ranging branch signal mapping value n p ; The adjusted ranging branch signal mapping value n p The distance measurement branch mapping value n before adjustment l The following formula is satisfied: n p =n l ·10 -ΔP / 20 。 3. The method according to claim 1, characterized in that The method further includes: in the initial link establishment stage, adjusting the signal mapping value of the ranging branch to a default value.

Images