TWI740543B - Method, device and receiver for eliminating and obtaining deviation of carrier phase measurement value - Google Patents

Abstract

The embodiment of the present invention discloses a method, a device and a receiver for eliminating and obtaining a deviation of the carrier phase measurement value. The method for eliminating the deviation of the carrier phase measurement value includes: calculating a first single-differential carrier phase measurement value and a second single-differential carrier phase measurement value The difference between the two carrier phases is the difference between the two carrier phase measurements. Each carrier phase measurement value carries frequency deviation and timing deviation. In the embodiment of the present invention, the frequency deviation and timing deviation of the carrier phase measurement value are considered at the same time. By performing the difference processing on the carrier phase measurement value carrying the frequency deviation and the timing deviation twice, the deviation-eliminated double differential carrier phase measurement value can be obtained. Effectively remove the influence of various deviations on the measured value of the carrier phase, and improve the accuracy of the measured value of the carrier phase, thereby improving the accuracy of positioning.

Description

Method, device and receiver for eliminating and obtaining deviation of carrier phase measurement value

The present invention relates to the field of communication technology, in particular to methods, devices and receivers for eliminating and obtaining deviations of carrier phase measurement values.

OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) carrier phase positioning requires a system model that considers the influence of the phase offset caused by the transmission delay.

The existing OFDM signal system model does not consider the influence of the phase offset caused by the transmission delay, and is not suitable for positioning based on the carrier phase. In addition, the positioning of the OFDM carrier phase requires a system model that can fully integrate the effects of various errors and interference factors on the OFDM carrier phase. However, the existing OFDM signal system model only considers certain factors based on needs, such as the impact of timing deviation or frequency deviation on the received OFDM signal, and lacks a system model that fully considers the effects of various factors. At the same time, there is no processing method for both frequency deviation and timing deviation in the prior art.

Due to the above-mentioned problems in the existing methods, the embodiments of the present invention provide methods, devices and receivers for eliminating and obtaining deviations of carrier phase measurement values.

In the first aspect, an embodiment of the present invention proposes a method for eliminating deviations of carrier phase measurement values, including: calculating the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain a deviation-eliminated double differential carrier Phase measurement value; Wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

In the second aspect, an embodiment of the present invention provides a method for obtaining carrier phase measurement values, which includes: receiving and measuring a positioning reference signal transmitted through a channel, obtaining a carrier phase measurement value carrying frequency deviation and timing deviation, and comparing the carrier phase The measured value is sent to the network side, so that the network side calculates the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value based on the carrier phase measurement value sent by each receiver, and obtains the double differential that eliminates the deviation Carrier phase measurement value; wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference between two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and Timing deviation.

In the third aspect, an embodiment of the present invention proposes a carrier phase measurement value deviation elimination device, including: a deviation elimination module for calculating the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value, Obtain the deviation-eliminated double differential carrier phase measurement value; where the first single differential carrier phase measurement value and the second single differential carrier phase measurement value are respectively the difference between the two carrier phase measurement values, and the two carrier phase measurement values The values both carry frequency deviation and timing deviation.

In a fourth aspect, an embodiment of the present invention provides a carrier phase measurement value acquisition device, including: The phase measurement module is used to receive and measure the positioning reference signal transmitted through the channel, obtain the carrier phase measurement value carrying frequency deviation and timing deviation, and send the carrier phase measurement value to the network side so that the network side The carrier phase measurement value sent by each receiver calculates the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain the deviation-eliminated double-differential carrier phase measurement value; wherein, the first single-differential carrier phase measurement value The phase measurement value and the second single-differential carrier phase measurement value are respectively the difference between two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

In a fifth aspect, an embodiment of the present invention provides a receiver, including a memory, a processor, and a computer program stored on the memory and running on the processor, wherein the processor executes the following steps when the computer program is running: calculation The difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value obtains the deviation-eliminated double-differential carrier phase measurement value; wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value The phase measurement values are respectively the difference between the two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

In a sixth aspect, an embodiment of the present invention provides a receiver including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the following steps when the computer program is running: receiving And measure the positioning reference signal after transmission through the channel, obtain the carrier phase measurement value carrying frequency deviation and timing deviation, and send the carrier phase measurement value to the network side, so that the The network side calculates the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value according to the carrier phase measurement value sent by each receiver, and obtains the deviation-eliminated double-differential carrier phase measurement value; The single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

In a seventh aspect, the embodiments of the present invention also provide a non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium storing a computer program, the computer program causes the computer to execute the above-mentioned carrier phase measurement deviation elimination method, and /Or, the method of obtaining the measured value of the carrier phase.

It can be seen from the above technical solution that the embodiment of the present invention considers the frequency deviation and timing deviation of the carrier phase measurement value at the same time. By performing the difference processing on the carrier phase measurement value carrying the frequency deviation and the timing deviation twice, a double differential that eliminates the deviation is obtained. The measured value of the carrier phase can effectively remove the influence of various deviations on the measured value of the carrier phase, which improves the accuracy of the measured value of the carrier phase, thereby improving the accuracy of positioning.

601: Deviation Elimination Module

701: Phase measurement module

801: processor

802: memory

803: Bus

901: processor

902: memory

903: Bus

S101, S201: step flow

In order to more clearly describe the technical solutions in the embodiment of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are merely the present invention. For some of the embodiments of the invention, for those with ordinary knowledge in the field, other schemas can be obtained from these diagrams without making progressive labor.

FIG. 1 is a schematic flowchart of a method for removing deviations of carrier phase measurement values according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of a method for obtaining carrier phase measurement values according to an embodiment of the present invention; Fig. 3 is a schematic diagram of a timing deviation provided by an embodiment of the present invention; Fig. 4 is a schematic diagram of a carrier phase transmission and reception scenario provided by an embodiment of the present invention; Fig. 5 is a schematic diagram of a carrier phase provided by an embodiment of the present invention Schematic diagram of the sending and receiving process; FIG. 6 is a schematic structural diagram of an apparatus for removing deviation of carrier phase measurement values according to an embodiment of the present invention; FIG. 7 is a schematic structural diagram of an apparatus for obtaining carrier phase measurement values according to an embodiment of the present invention Figure 8 is a logical block diagram of a receiver provided by an embodiment of the present invention; Figure 9 is a logical block diagram of a receiver provided by another embodiment of the present invention.

The specific embodiments of the present invention will be further described below in conjunction with the drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a method for eliminating deviations of carrier phase measurement values provided by this embodiment, including:

S101: Calculate the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain the double-differential carrier phase measurement value that eliminates the deviation.

Wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

The first single differential carrier phase measurement value is the difference between the first carrier phase measurement value and the second carrier phase measurement value.

The second single differential carrier phase measurement value is the difference between the third carrier phase measurement value and the fourth carrier phase measurement value.

The first carrier phase measurement value, the second carrier phase measurement value, the third carrier phase measurement value, and the fourth carrier phase measurement value are all carrier phase measurement values that carry frequency deviation and timing deviation.

The first carrier phase measurement value is obtained by the first receiver by measuring the first reference signal sent by the first transmitter.

The second carrier phase measurement value is obtained by the first receiver by measuring the second reference signal sent by the second transmitter.

The third carrier phase measurement value is obtained by the second receiver by measuring the third reference signal sent by the first transmitter.

The fourth carrier phase measurement value is obtained by the second receiver by measuring the fourth reference signal sent by the second transmitter.

Specifically, after receiving the positioning reference signal sent by the transmitter and passing through the channel, the receiver measures the positioning reference signal to obtain a carrier phase measurement value carrying frequency deviation and timing deviation, and adds the carrier phase measurement value to Report to the network side, and the network side obtains the single-differential carrier phase measurement value by performing the difference operation on the two received carrier phase measurement values; further, by performing the difference operation on the two single-differential carrier phase measurement values, the elimination The deviation of the dual differential carrier phase measurement.

In this embodiment, the frequency deviation and timing deviation of the carrier phase measurement value are considered at the same time. By performing the difference processing twice on the carrier phase measurement value carrying the frequency deviation and timing deviation, the double differential carrier phase measurement value that eliminates the deviation is obtained, which can be effective The influence of various deviations on the measured value of the carrier phase is removed, and the accuracy of the measured value of the carrier phase is improved, thereby improving the accuracy of positioning.

FIG. 2 shows a schematic flow chart of a method for obtaining carrier phase measurement values provided by this embodiment, including:

S201. Receive and measure the positioning reference signal transmitted through the channel, obtain the carrier phase measurement value carrying the frequency deviation and timing deviation, and send the carrier phase measurement value to the network side, so that the network side transmits according to each receiver The carrier phase measurement value calculates the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain the deviation-eliminated double-differential carrier phase measurement value; wherein, the first single-differential carrier phase measurement value and the The second single differential carrier phase measurement values are respectively the difference between two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

Wherein, the positioning reference signal is a signal sent by the transmitter to the receiver and transmitted through the channel.

The positioning reference signal adopts the OFDM symbol waveform to be transmitted through the channel and then sent to the receiver.

The carrier phase measurement value is the measured value of the carrier phase carrying the frequency deviation and the timing deviation after the receiver receives the positioning reference signal sent by the transmitter and passed through the channel, and then measures the positioning reference signal.

Specifically, after the transmitter sends the positioning reference signal, because it passes through the channel, when the positioning reference signal reaches the receiver, it carries frequency deviation and timing deviation, that is, the carrier phase measurement value measured by the receiver carries frequency deviation and Timing deviation. In order to eliminate the deviation, this embodiment performs two differential processing on the carrier phase measurement value carrying the frequency deviation and the timing deviation, and the deviation is eliminated. The measured value of the double differential carrier phase can effectively remove the influence of various deviations on the measured value of the carrier phase, improve the accuracy of the measured value of the carrier phase, and thus improve the accuracy of positioning.

Further, on the basis of the foregoing method embodiment, the carrier phase measurement value is calculated according to the frequency domain equivalent received signal model of each subcarrier.

The frequency-domain equivalent received signal model is obtained by adding frequency deviation and timing deviation to the ideal model of the frequency-domain equivalent received signal.

Specifically, for an ideal OFDM system model that does not consider the transmission delay, it includes a transmission signal model and a channel model. The following describes the basic parameters and symbol definitions used in each model:

1. Send signal model:

{0,1,...,N-1}被分組為向量X=[X₀,...,X_N-1]^T，並在時隙中的第m個OFDM符號中發送。X做歸一化逆離散時間傅立葉轉換(IDFT)，可得持續時間為T=NT_s=1/△f_SCS的OFDM符號的複包絡的連續時間表示。 Consider an OFDM transmission with N subcarriers, the subcarrier spacing Δf _SCS , and the sampling time interval T _s =1/( _{NΔf SCS} ). OFDM transmission is based on the block OFDM model, that is, the channel in each OFDM symbol remains unchanged. Assume that N quadrature amplitude modulation (QAM) symbols X _k , k

{0,1,...,N-1} is grouped into a vector X=[X ₀ ,...,X _N-1 ] ^T and sent in the mth OFDM symbol in the slot. X does the normalized inverse discrete-time Fourier transform (IDFT), and the continuous time representation of the complex envelope of the OFDM symbol with _{a duration of T=NT s} =1/△f _{SCS can be obtained.}

,n

{0,1,...,N-1}可以表示為

The discrete-time signal in the digital baseband obtained through sampling at the sampling time interval T _s

,n

{0,1,...,N-1} can be expressed as

The time-domain signal x ^m (t) is up-converted to the center frequency f _{c of the} carrier, and the radio frequency signal obtained is shown in the following formula (3):

2. Channel model:

Suppose that the impulse response of the multipath channel between the transmitter and the receiver at time t is modeled by the following formula (4):

Among them, h l (t) and τ _l correspond to the relative attenuation and propagation delay of the _{l-th path, respectively.} The number of multipath components is L, and δ(.) represents the unit Dirac delta function.

Assuming that the channel is a quasi-static channel, that is, the channel remains unchanged during an OFDM symbol transmission period, the quasi-static channel can use time discrete channel impulse response (CIR) h=[h ₀ ,h ₁ ,...,h _{L- 1} ] ^T to describe,

。 Among them, h _l and τ _l are the attenuation and delay components of the l-th path, respectively. The unit of the delay component τ _{l is seconds.} When sampling with a sampling interval, the delay component takes the number of samples as the unit, and the value is

.

3. The ideal OFDM system model without considering the transmission delay:

Under ideal OFDM reception conditions, it is assumed that there is ideal time synchronization and frequency synchronization between the transmitter and receiver, and there is no phase noise. After the receiving end removes the received signal samples belonging to the loop prefix (CP), the nth data sample of the mth OFDM symbol received can be expressed by the following formula:

Among them, H _k is the equivalent frequency domain channel response on the k-th subcarrier, and the calculation formula is as follows:

Performing normalized DFT operations on both ends of the equation of formula (7), the ideal model of the equivalent received signal in the frequency domain on the m-th OFDM symbol and the k-th subcarrier can be obtained as:

Among them, W _k to CN (0,σ ² ) obey a complex Gaussian distribution with a mean value of 0 and a variance of σ ² _{, and H k} refers to formula (7).

Furthermore, for the ideal OFDM system model considering the transmission delay, it also includes the transmission signal model and the channel model. The following describes the basic parameters and symbol definitions used in each model:

1. Send signal model:

The transmission signal model of the ideal OFDM system model that considers the transmission delay is exactly the same as the transmission signal model of the ideal OFDM system model that does not consider the transmission delay, and will not be repeated here.

2. Channel model:

Suppose that the impulse response of the multipath channel between the transmitter and the receiver at time t is modeled by the following formula:

(t)，其中，

(t)可能是由於初始相位雜訊導致的。Φ_l(t)可以由下式表示：

Among them, h _l (t), Φ l (t) and τ _l respectively correspond to the relative attenuation, phase shift and propagation delay of the _{l-th path.} The number of multipath components is L, and δ(.) represents the unit Dirac delta function. The phase offset Φ _l (t) includes the component due to free space propagation plus the component due to other phase noise experienced in the channel

(t), where

(t) may be caused by initial phase noise. Φ _l (t) can be expressed by the following formula:

Assuming that the channel is a quasi-static channel, that is, the channel remains unchanged during an OFDM symbol transmission period, the quasi-static channel can use time discrete channel impulse response (CIR) h=[h ₀ ,h ₁ ,...,h _{L- 1} ] ^T to describe:

。 Among them, h _l , Φ _l and τ _l are the amplitude attenuation, phase shift and delay components of the l-th path, respectively. The unit of the delay component τ _{l is seconds.} When sampling with sampling interval, the delay component is based on the number of sampling points, and the value is

.

It should be noted that, compared with the ideal OFDM system model that does not consider the transmission delay, formula (4) does not include the phase offset Φ _l (t), and formula (9) includes the phase offset Φ _l (t); for carrier phase In the technical solution, the key metric value expected to be obtained is the component caused by the free space propagation included in the _{phase offset Φ l (t), that is, 2πf c} τ _l .

3. OFDM system model under ideal conditions:

Under ideal OFDM reception conditions, it is assumed that there is ideal time synchronization and frequency synchronization between the transmitter and receiver, and there is no phase noise. After the receiving end removes the received signal samples belonging to the loop prefix (CP), the nth data sample of the mth OFDM symbol received can be expressed by the following formula:

Among them, H _k is the equivalent frequency domain channel response on the k-th subcarrier, and the calculation formula is as follows:

Performing normalized Discrete Time Fourier Transform (DFT) operation for both ends of the equation of formula (12), the frequency domain equivalent received signal model on the mth OFDM symbol and the kth subcarrier can be obtained as:

Among them, W _k to CN (0,σ ² ) obey a complex Gaussian distribution with a mean value of 0 and a variance of σ ² _{, and H k can} refer to formula (13).

的相位值不相同，公式(14)中的相位值是-2π(f_c+k△f_SCS)τ_l-

，與載波頻率相關，能夠真實反應傳輸距離；而公式(8)中的相位值是-j2π(k△f_SCS)τ_l，與載波頻率無關，不能真實反應傳輸距離。 It should be noted that, compared with the ideal OFDM system model that does not consider the transmission delay, the main difference between formula (14) and formula (8) is the frequency domain equivalent received signal on the kth subcarrier of the mth OFDM symbol

The phase value of is not the same, the phase value in formula (14) is -2π(f _c +k△f _SCS )τ _l-

, Which is related to the carrier frequency and can truly reflect the transmission distance; while the phase value in formula (8) is -j2π(k△f _SCS )τ _l , which has nothing to do with the carrier frequency and cannot truly reflect the transmission distance.

Furthermore, for the complete OFDM system model under the conditions of timing deviation, frequency deviation and phase noise, the introduction is as follows: First, the definitions of timing deviation Δt, frequency deviation Δf and phase noise are given.

t^Rx-t^true表示接收端實際定時與理想定時之間的定時偏差，△t^Tx

t^Tx-t^true表示發送端實際定時與理想定時之間的定時偏差，

表示發射端和接收端之間的定時偏差，則在接收端時刻t^Rx收到的接收訊號對應於發送端時刻t^Tx=t^Rx-△t。 As shown in Figure 3, define △t ^Rx

t ^Rx -t ^true represents the timing deviation between the actual timing and the ideal timing at the receiving end, △t ^Tx

t ^Tx -t ^true represents the timing deviation between the actual timing and the ideal timing of the sender,

Indicates the timing deviation between the transmitting end and the receiving end, and ^{the received signal received at the receiving end time t Rx} corresponds to the transmitting end time t ^Tx = t ^Rx -Δt.

Assuming that the carrier frequency deviation (CFO) after initial time synchronization and frequency synchronization between the receiving end and the transmitting end is △f, and δf=△f/△f _SCS is the normalized frequency deviation, where △f _SCS is the subcarrier spacing.

和y^m(t)

。在OFDM系統模型中，每個子載波對應的頻域通道頻寬內通常可認為是頻率平坦衰落通道。在頻率平坦衰落通道條件下，發送器和接收器的相位雜訊對OFDM系統模型有相同的影響。於是，在OFDM系統模型中，可使用接收器振盪器的相位雜訊來代表發送器和接收器的相位雜訊對OFDM系統模型的共同影響。 Assume that Φ _TX (t) and Φ _RX (t) are the phase noise of the oscillators of the transmitter and receiver, respectively. The _{influence of Φ TX} (t) on the up-conversion of the transmitted signal x ^m (t) and the influence of Φ _RX (t) on the down-conversion of the received signal y ^m (t) can be expressed as x ^m (t)

And y ^m (t)

. In the OFDM system model, the bandwidth of the frequency domain channel corresponding to each subcarrier can usually be considered as a frequency flat fading channel. Under the condition of frequency flat fading channel, the phase noise of the transmitter and the receiver have the same influence on the OFDM system model. Therefore, in the OFDM system model, the phase noise of the receiver oscillator can be used to represent the common influence of the phase noise of the transmitter and the receiver on the OFDM system model.

Based on the above definition, through mathematical derivation, it can be obtained that under the influence of timing deviation △t, frequency deviation △f and phase noise at the same time, the frequency domain equivalent received signal of each sub-carrier is based on frequency deviation, timing deviation and equivalent The frequency domain channel response is calculated; where the timing deviation and the equivalent frequency domain channel response are both calculated based on the center frequency of the carrier.

的運算式，即頻域等效接收訊號模型如下：

Specifically, the frequency domain received symbol on the kth subcarrier of the mth OFDM symbol

The calculation formula, that is, the frequency domain equivalent received signal model is as follows:

in,

J₀為頻率偏差、定時偏差和相位雜訊對第k個子載波引入的公共相位偏差，J₀為相位雜訊對第k個子載波引入的公共相位加權因數，H_k為第m個OFDM符號的第k個子載波上的等效頻域通道回應，X_k為第m個OFDM符號的第k個子載波上發送的調變符號，W_k為第m個OFDM符號的第k個子載波上的複高斯雜訊，l為通道多徑分量的序號，L為通道多徑分量的數量，J_k-r為第(k-r)個樣值點的相位雜訊加權因數，N為OFDM符號對應的樣值點數，h_l為第l條通道多徑分量的相對幅度衰減，τ_l為第l條通道多徑分量的相位偏移，

為第l條通道多徑分量的傳播延遲，J_p為第p個樣值點的相位雜訊加權因數，

為m個OFDM符號的第n個樣值點上的 相位雜訊，

為第m個OFDM符號上頻率偏差引入的公共相位偏差，

為第m個OFDM符號的第n個樣值點上頻率偏差引入的獨立相位偏差，n為樣值點序號，

為第q個OFDM符號的迴圈首碼對應的樣值點數。 Among them, m is the total number of orthogonal frequency division multiplexing OFDM symbols, k is the sequence number of the subcarrier, 1i is the imaginary unit, θ ^{m, 1} is the phase deviation caused by the frequency deviation, f _c is the center frequency of the carrier, △f _SCS is the subcarrier spacing, δf is the frequency deviation, △t is the timing deviation,

J ₀ is the common phase deviation introduced by frequency deviation, timing deviation and phase noise to the kth subcarrier, J ₀ is the common phase weighting factor introduced by phase noise to the kth subcarrier, and H _k is the common phase deviation of the mth OFDM symbol. The equivalent frequency domain channel response on the kth subcarrier, X _k is the modulation symbol sent on the kth subcarrier _{of the mth OFDM symbol, W k} is the complex Gaussian on the kth subcarrier of the mth OFDM symbol Noise, l is the number of channel multipath components, L is the number of channel multipath components, J _kr is the phase noise weighting factor of the (kr)th sample point, N is the number of sample points corresponding to the OFDM symbol, h _l is the relative amplitude attenuation of the multipath component of the l channel, τ _l is the phase offset of the multipath component of the l channel,

Is the propagation delay of the multipath component of the l- _{th channel, J p} is the phase noise weighting factor of the p-th sample point,

Is the phase noise at the nth sample point of m OFDM symbols,

Is the common phase deviation introduced by the frequency deviation on the m-th OFDM symbol,

Is the independent phase deviation introduced by the frequency deviation at the nth sample point of the mth OFDM symbol, where n is the sample point number,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol.

The formula (15) defines the frequency-domain received symbol on the k-th subcarrier of the m-th OFDM symbol, and the influence of each parameter is analyzed below.

，則θ^m,1由頻率偏移δf和從時隙開始到第m個OFDM符號的時間間隔確定。 First, the phase shift θ ^m,1 caused by the frequency deviation δf is the same for all subcarriers of the OFDM symbol. If we ignore the inter-subcarrier interference caused by the phase shift caused by δf

, Then θ ^{m,1 is} determined by the frequency offset δf and the time interval from the start of the slot to the mth OFDM symbol.

上的定時偏差△t引起的載波相位偏差取決於子載波k的絕對載波頻率f_c+k△f_SCS，例如，

。在絕大多數研究OFDM技術的現有論文中，只提到了

，而忽略了

。對於基於OFDM訊號的載波相位的定位技術方案，

對載波相位測量值的影響不可忽略。 Second, by

The carrier phase deviation caused by the timing deviation △t depends on the absolute carrier frequency f _c +k△f _SCS of the sub-carrier k, for example,

. In most of the existing papers on OFDM technology, only mention

, While ignoring

. For the positioning technology solution based on the carrier phase of the OFDM signal,

The influence on the measured value of the carrier phase cannot be ignored.

Third, the influence of the propagation delay (τ _l ) of the multipath channel on the measured value of the carrier phase is reflected in the channel frequency response H _k shown in formula (13). The accuracy of carrier phase positioning depends on whether the carrier phase measurement value caused by the propagation delay can be obtained correctly.

和傳播延遲(τ_l)引起的載波相位偏差在載波相位測量值中混合在一起，因此需要在載波相位測量公式中綜合考慮。對於基於載波相位的定位技術，需要消除頻率偏差δf、時間偏差△t對載波相位測量值的影響。 Fourth, from frequency deviation δf, timing deviation △t, phase noise

The carrier phase deviation caused by the propagation delay (τ _l ) is mixed in the carrier phase measurement value, so it needs to be comprehensively considered in the carrier phase measurement formula. For the positioning technology based on carrier phase, it is necessary to eliminate the influence of frequency deviation δf and time deviation Δt on the measured value of carrier phase.

的影響。 What needs to be explained is that for the carrier phase technical solution, the key is how to get the components that only contain free space propagation (ie 2πf _c τ _l ), and eliminate the frequency deviation δf, timing deviation Δt, and phase noise.

Impact.

Furthermore, double differential is used to eliminate the influence of frequency deviation δf and timing deviation Δt on the carrier phase measurement value. The purpose of the double differential scheme is to eliminate the influence of frequency deviation δf and timing deviation Δt, and obtain only the influence caused by free space propagation. Carrier phase value (ie 2πf _c τ _l ).

H_kX_k的相位值是：

According to formula (15), it can be seen that, without considering the inter-subcarrier interference (ICI) caused by phase noise and frequency deviation, the target received signal on the kth subcarrier

The phase value of H _k X _{k is:}

In the OFDM signal-based receiver phase-locked loop (PLL) output carrier phase measurement value should not include the influence of subcarrier k, but an OFDM symbol will only output the same carrier phase measurement value. Therefore, in formula (19) The components corresponding to the different subcarriers k will not be reflected in the final carrier phase measurement value. And when the PLL is initially locked, the output carrier phase value is between 0 and 2π.

The following analyzes the measured value of the carrier phase when the PLL is initially locked, and the calculation formula for the double differential to eliminate the frequency deviation δf and the timing deviation Δt.

和

；目標UE a和參考UE b透過基地台j發送的參考訊號獲取載波相位測量值為

和

。如圖4所示，右上角的即是參考UE接收器b，右下角的是目標UE接收器a。 As shown in Figure 4, suppose that target UE receiver a and reference UE receiver b obtain TOA (Time of Arrival) and phase measurement values from m (m>2) base stations, target UE a and reference UE b Obtain the carrier phase measurement value through the reference signal sent by the base station i (i=1,...,m)

with

; The target UE a and the reference UE b obtain the carrier phase measurement value through the reference signal sent by the base station j

with

. As shown in Figure 4, the upper right corner is the reference UE receiver b, and the lower right corner is the target UE receiver a.

Each carrier phase measurement value is calculated according to the frequency deviation phase measurement value, the timing deviation phase measurement value, the propagation delay phase measurement value and the phase noise phase measurement value.

Wherein, the measured value of the timing deviation phase and the measured value of the propagation delay phase are calculated according to the center frequency of the carrier.

、該第二載波相位測量值

、該第三載波相位測量值

、該第四載波相位測量值

分別如下式所示：

According to formula (19), the measured value of the first carrier phase

, The second carrier phase measurement value

, The third carrier phase measurement value

, The fourth carrier phase measurement value

They are as follows:

q

m-1，N為OFDM符號對應的樣值點數，

為第q個OFDM符號的迴圈首碼對應的樣值點數，f_c為載波的中心頻率，

為該第一載波相位測量值攜帶的頻率偏差，

為該第二載波相位測量值攜帶的頻率偏差，

為該第三載波相位測量值攜帶的頻率偏差，

為該第四載波相位測量值攜帶的頻率偏差，

為該第一載波相位測量值攜帶的定時偏差，

為該第二載波相位測量值攜帶的定時偏差，

為該第三載波相位測量值攜帶的定時偏差，

為該第四載波相位測量值攜帶的定時偏差，

為該第一載波相位測量值攜帶的傳播延遲，

為該第二 載波相位測量值攜帶的傳播延遲，

為該第三載波相位測量值攜帶的傳播延遲，

為該第四載波相位測量值攜帶的傳播延遲，

為該第一載波相位測量值攜帶的相位雜訊，

為該第二載波相位測量值攜帶的相位雜訊，

為該第三載波相位測量值攜帶的相位雜訊，

為該第四載波相位測量值攜帶的相位雜訊。 Where a is the first receiver, b is the second receiver, i is the first transmitter, j is the second transmitter, m is the total number of orthogonal frequency division multiplexing OFDM symbols, and q is The sequence number of the OFDM symbol, 0

q

m-1, N is the number of sample points corresponding to the OFDM symbol,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol, f _c is the center frequency of the carrier,

Is the frequency deviation carried by the first carrier phase measurement value,

Is the frequency deviation carried by the second carrier phase measurement value,

Is the frequency deviation carried by the third carrier phase measurement value,

Is the frequency deviation carried by the fourth carrier phase measurement value,

Is the timing deviation carried by the first carrier phase measurement value,

Is the timing deviation carried by the second carrier phase measurement value,

Is the timing deviation carried by the third carrier phase measurement value,

Is the timing deviation carried by the fourth carrier phase measurement value,

Is the propagation delay carried by the first carrier phase measurement,

Is the propagation delay carried by the second carrier phase measurement,

Is the propagation delay carried by the third carrier phase measurement,

Is the propagation delay carried by the fourth carrier phase measurement,

Is the phase noise carried by the first carrier phase measurement value,

Is the phase noise carried by the second carrier phase measurement value,

Is the phase noise carried by the third carrier phase measurement value,

Is the phase noise carried by the fourth carrier phase measurement value.

為：

Formula (20) minus formula (21), we can get the single-differential carrier phase measurement value from base station i and base station j measured by target UE a

for:

Among them, the superscript "ij" indicates that the single difference operation is performed between the measured values of i and j of the two base stations (transmitting ends), namely

為：

In the same way, formula (22) minus formula (23), the single-differential carrier phase measurement values from base station i and base station j measured for reference UE b can be obtained

for:

為：

Using formula (24) minus formula (26), the measured value of the dual differential carrier phase based on base station i and base station j, target UE a and reference UE b can be obtained

for:

為該第一單差分載波相位測量值攜帶的頻率偏差，

為該第二單差分載波相位測量值攜帶的頻率偏差，

為該雙差分載波相位測量值攜帶 的頻率偏差，

為該第一單差分載波相位測量值攜帶的定時偏差，

為該第二單差分載波相位測量值攜帶的定時偏差，

為該雙差分載波相位測量值攜帶的定時偏差，

為該第一單差分載波相位測量值攜帶的傳播延遲，

為該第二單差分載波相位測量值攜帶的傳播延遲，

為該雙差分載波相位測量值攜帶的傳播延遲，

為該第一單差分載波相位測量值攜帶的相位雜訊，

為該第二單差分載波相位測量值攜帶的相位雜訊，

為該雙差分載波相位測量值攜帶的相位雜訊，

。

Is the frequency deviation carried by the first single differential carrier phase measurement value,

Is the frequency deviation carried by the second single differential carrier phase measurement value,

Is the frequency deviation carried by the double differential carrier phase measurement value,

Is the timing deviation carried by the first single differential carrier phase measurement value,

Is the timing deviation carried by the second single differential carrier phase measurement value,

Is the timing deviation carried by the double differential carrier phase measurement value,

Is the propagation delay carried by the first single differential carrier phase measurement,

Is the propagation delay carried by the second single differential carrier phase measurement,

Is the propagation delay carried by the double differential carrier phase measurement,

Is the phase noise carried by the first single differential carrier phase measurement value,

Is the phase noise carried by the second single-differential carrier phase measurement value,

Is the phase noise carried by the double differential carrier phase measurement value,

.

包含的每一項進行分析：

The following is the measured value of the dual differential carrier phase of equation (27)

Each item included is analyzed:

Among them, δf represents the frequency deviation of the crystal oscillator of the base station and the UE, not the Doppler frequency shift of the UE.

So available,

是與UE定位相關的雙差分傳播時延值；

，

和

與目標UE a和參考UE b無關。

Is the double-differential propagation delay value related to UE positioning;

,

with

It has nothing to do with target UE a and reference UE b.

。 In summary, without considering the ICI caused by phase noise and frequency deviation, the phase deviation caused by the UE timing deviation and the frequency error of the UE crystal oscillator can be eliminated through double differential, and the expected double differential propagation delay value can be obtained.

.

Among them, N _m represents the double-difference integer ambiguity to be solved.

This embodiment provides a complete system model that integrates the effects of various errors and interference factors on the phase of the OFDM carrier. The system model includes the effects of the wireless fading channel transmission delay, timing deviation, frequency deviation, and phase noise on the OFDM carrier. The influence of the phase can be applied to the carrier phase positioning scheme based on the OFDM system, and the influence of the frequency deviation δf and the time deviation Δt on the measured value of the carrier phase can be eliminated based on the double differential.

For example, the overall flow chart of carrier phase positioning based on double differential to eliminate the frequency offset and time offset error of the OFDM signal is shown in FIG. 5. Among them, Step1 to Step4, Step6 to Step9, and Step11 are previous technologies, and Step5 and Step10 are unique innovations of the present invention. The sending end can be a base station or a terminal, and the receiving end can be a terminal or a base station.

1. The base station is the sender:

Step1. Perform serial-to-parallel conversion on the downlink reference signal (Reference Signal, RS) sending signal; Step2, perform Inverse Fast Fourier Transform (IFFT) operation, as shown in formula (2); Step3, perform parallel String conversion; Step4, insert the loop prefix (CP); Step5. Go through the equivalent baseband channel and add signal transmission delay, timing deviation, frequency deviation and phase noise.

2. The terminal is the receiving end:

；Step10、基於公式(15)所示的頻域接收符號

計算載波相位測量值，並採用本實施例該的雙差分方法，計算得到公式(28)所示的雙差分載波相位測量值

；Step11、雙差分載波相位測量值

上報給網路側，用於網路側結合已知的基地台位置和參考UE位置等資訊聯合計算雙差分整周模糊度N_m，然後計算得到目標UE位置，或者目標UE自身計算。 Step6, remove CP; Step7, perform serial-to-parallel conversion for the downlink RS received signal; Step8, perform Fast Fourier Transform (FFT) operation; Step9, perform parallel-to-serial conversion, and obtain the frequency shown in formula (15) Domain receive symbol

; Step10, receiving symbols based on the frequency domain shown in formula (15)

Calculate the measured value of the carrier phase, and use the double-differential method of this embodiment to calculate the measured value of the double-differential carrier phase shown in formula (28)

; Step11, double differential carrier phase measurement value

It is reported to the network side for the network side to jointly calculate the double-differential ambiguity N _m based on the known base station position and reference UE position, and then calculate the target UE position or the target UE itself.

This embodiment provides carrier phase measurement values that include transmission delay, timing deviation, frequency deviation, phase noise, and other errors, which can better simulate the effect of errors on the accuracy of carrier phase measurement values; at the same time, double differential frequency elimination is used. The influence of the deviation δf and the timing deviation Δt on the measured value of the carrier phase can effectively remove the influence of the above-mentioned error on the measured value of the carrier phase, improve the accuracy of the measured value of the carrier phase, and thereby improve the accuracy of positioning.

FIG. 6 shows a schematic structural diagram of a deviation elimination device for carrier phase measurement values provided by this embodiment. The device includes: a deviation elimination module 601, wherein: the deviation elimination module 601 is used to calculate the first single-differential carrier phase The difference between the measured value and the second single-differential carrier phase measurement value to obtain the double-differential carrier phase measurement value that eliminates the deviation; Wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation.

The device for eliminating the deviation of the carrier phase measurement value in this embodiment can be used to execute the corresponding method embodiment described above, and its principles and technical effects are similar, and will not be repeated here.

FIG. 7 shows a schematic structural diagram of an apparatus for obtaining carrier phase measurement values provided by this embodiment. The apparatus includes: a phase measurement module 701, wherein: the phase measurement module 701 is used to receive and measure the measured value of the carrier wave after transmission through the channel. Position the reference signal, obtain the carrier phase measurement value carrying the frequency deviation and timing deviation, and send the carrier phase measurement value to the network side, so that the network side can calculate the first single-differential carrier based on the carrier phase measurement value sent by each receiver The difference between the phase measurement value and the second single-differential carrier phase measurement value to obtain the double-differential carrier phase measurement value that eliminates the deviation; wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively The difference between two carrier phase measurement values, both of which carry frequency deviation and timing deviation.

The apparatus for acquiring the measured value of the carrier phase in this embodiment can be used to execute the corresponding method embodiment described above, and its principles and technical effects are similar, and will not be repeated here.

Referring to FIG. 8, the receiver includes: a processor 801, a memory 802, and a bus 803; wherein the processor 801 and the memory 802 communicate with each other through the bus 803; The processor 801 is used to call the program instructions in the memory 802 to perform the following steps: calculate the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain a double differential that eliminates the deviation Carrier phase measurement value; wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference between two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and Timing deviation.

In this embodiment, the frequency deviation and timing deviation of the carrier phase measurement value are considered at the same time. By performing the difference processing twice on the carrier phase measurement value carrying the frequency deviation and timing deviation, the double differential carrier phase measurement value that eliminates the deviation is obtained, which can be effective The influence of various deviations on the measured value of the carrier phase is removed, and the accuracy of the measured value of the carrier phase is improved, thereby improving the accuracy of positioning.

Further, the first single differential carrier phase measurement value is the difference between the first carrier phase measurement value and the second carrier phase measurement value; the second single differential carrier phase measurement value is the third carrier phase measurement value and the fourth carrier phase measurement value The difference between the phase measurement values; where the first carrier phase measurement value, the second carrier phase measurement value, the third carrier phase measurement value, and the fourth carrier phase measurement value are all carrier phase measurement values that carry frequency deviation and timing deviation .

Further, the first carrier phase measurement value is obtained by the first receiver by measuring the first reference signal sent by the first transmitter; the second carrier phase measurement value is obtained by the first receiver by measuring the first reference signal sent by the second transmitter The second reference signal is obtained; The third carrier phase measurement value is obtained by the second receiver by measuring the third reference signal sent by the first transmitter; the fourth carrier phase measurement value is the second receiver by measuring the second transmitter sent by the second transmitter. Four reference signals are obtained.

Further, the first carrier phase measurement value, the second carrier phase measurement value, the third carrier phase measurement value, and the fourth carrier phase measurement value are based on the frequency deviation phase measurement value, the timing deviation phase measurement value, and the propagation delay The phase measurement value and the phase noise phase measurement value are calculated; wherein, the timing deviation phase measurement value and the propagation delay phase measurement value are both calculated according to the center frequency of the carrier.

、該第二載波相位測量值

、該第三載波相位測量值

、該第四載波相位測量值

分別通過以下公式獲取：

Further, the first carrier phase measurement value

, The second carrier phase measurement value

, The third carrier phase measurement value

, The fourth carrier phase measurement value

Respectively obtained by the following formula:

q

m-1，N為OFDM符號對應的樣值點數，

為第q個OFDM符號的迴圈首碼對應的樣值點數，f_c為載波的中心頻率，

為該第一載波相位測量值攜帶的頻率偏差，

為該第二載波相位測量值攜帶的頻率偏差，

為該第三載波相位測量值攜帶的頻率偏差，

為該第四載波相位測量值攜帶的頻率偏差，

為該第一載波相位測量值攜帶的定時偏差，

為該第二載波相位測量值攜帶的定時偏差，

為該第三載波相位測量值攜帶的定時偏差，

為該第四載波相位測量值攜帶的定時偏差，

為該第一載波相位測量值攜帶的傳播延遲，

為該第二載波相位測量值攜帶的傳播延遲，

為該第三載波相位測量值攜帶的傳播延遲，

為該第四載波相位測量值攜帶的傳播延遲，

為該第一載波相位測量值攜帶的相位雜訊，

為該第二載波相位測量值攜帶的相位雜訊，

為該第三載波相位測量值攜帶的相位雜訊，

為該第四載波相位測量值攜帶的相位雜訊。 Where a is the first receiver, b is the second receiver, i is the first transmitter, j is the second transmitter, m is the total number of orthogonal frequency division multiplexing OFDM symbols, and q is The sequence number of the OFDM symbol, 0

q

m-1, N is the number of sample points corresponding to the OFDM symbol,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol, f _c is the center frequency of the carrier,

Is the frequency deviation carried by the first carrier phase measurement value,

Is the frequency deviation carried by the second carrier phase measurement value,

Is the frequency deviation carried by the third carrier phase measurement value,

Is the frequency deviation carried by the fourth carrier phase measurement value,

Is the timing deviation carried by the first carrier phase measurement value,

Is the timing deviation carried by the second carrier phase measurement value,

Is the timing deviation carried by the third carrier phase measurement value,

Is the timing deviation carried by the fourth carrier phase measurement value,

Is the propagation delay carried by the first carrier phase measurement,

Is the propagation delay carried by the second carrier phase measurement,

Is the propagation delay carried by the third carrier phase measurement,

Is the propagation delay carried by the fourth carrier phase measurement,

Is the phase noise carried by the first carrier phase measurement value,

Is the phase noise carried by the second carrier phase measurement value,

Is the phase noise carried by the third carrier phase measurement value,

Is the phase noise carried by the fourth carrier phase measurement value.

和第二單差分載波相位測量值

的差值，得到消除偏差的雙差分載波相位測量值

Further, calculating the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain the deviation-eliminated double-differential carrier phase measurement value includes: calculating the first single-differential carrier phase measurement value

And the second single differential carrier phase measurement

The difference value of, get the double differential carrier phase measurement value that eliminates the deviation

in,

為該第一單差分載波相位測量值攜帶的頻率偏差，

為該第二單差分載波相位測量值攜帶的頻率偏差，

為該雙差分載波相位測量值攜帶的頻率偏差，

為該第一單差分載波相位測量值攜帶的定時偏差，

為該第 二單差分載波相位測量值攜帶的定時偏差，

為該雙差分載波相位測量值攜帶的定時偏差，

為該第一單差分載波相位測量值攜帶的傳播延遲，

為該第二單差分載波相位測量值攜帶的傳播延遲，

為該雙差分載波相位測量值攜帶的傳播延遲，

為該第一單差分載波相位測量值攜帶的相位雜訊，

為該第二單差分載波相位測量值攜帶的相位雜訊，

為該雙差分載波相位測量值攜帶的相位雜訊，

。

Is the frequency deviation carried by the first single differential carrier phase measurement value,

Is the frequency deviation carried by the second single differential carrier phase measurement value,

Is the frequency deviation carried by the double differential carrier phase measurement value,

Is the timing deviation carried by the first single differential carrier phase measurement value,

Is the timing deviation carried by the second single differential carrier phase measurement value,

Is the timing deviation carried by the double differential carrier phase measurement value,

Is the propagation delay carried by the first single differential carrier phase measurement,

Is the propagation delay carried by the second single differential carrier phase measurement,

Is the propagation delay carried by the double differential carrier phase measurement,

Is the phase noise carried by the first single differential carrier phase measurement value,

Is the phase noise carried by the second single-differential carrier phase measurement value,

Is the phase noise carried by the double differential carrier phase measurement value,

.

The receiver in this embodiment can be used to execute the above corresponding method embodiments, and its principles and technical effects are similar, and will not be repeated here.

9, the receiver includes: a processor 901, a memory 902, and a bus 903; wherein the processor 901 and the memory 902 communicate with each other through the bus 903; the The processor 901 is used to call the program instructions in the memory 902 to perform the following steps: receiving and measuring the positioning reference signal transmitted through the channel, obtaining the carrier phase measurement value carrying the frequency deviation and timing deviation, and converting the carrier The phase measurement value is sent to the network side, so that the network side calculates the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value based on the carrier phase measurement value sent by each receiver, and obtains the double Differential carrier phase measurement value; wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation And timing deviation.

After the transmitter sends the positioning reference signal, because it passes through the channel, when the positioning reference signal reaches the receiver, it carries frequency deviation and timing deviation, that is, the carrier phase measurement value measured by the receiver carries frequency deviation and timing deviation. In order to eliminate the deviation, this embodiment performs two difference processing on the carrier phase measurement value carrying frequency deviation and timing deviation to obtain a double differential carrier phase measurement value that eliminates the deviation, which can effectively remove the influence of various deviations on the carrier phase measurement value. , Improve the accuracy of the carrier phase measurement value, thereby improving the accuracy of positioning.

Further, the carrier phase measurement value is calculated based on the frequency domain equivalent received signal of one or more subcarriers.

Further, the frequency domain equivalent received signal of one or more subcarriers is calculated according to frequency deviation, timing deviation and equivalent frequency domain channel response; wherein, the timing deviation and equivalent frequency domain channel response are calculated according to the center frequency of the carrier get.

為

Further, the frequency domain equivalent received signal on the kth subcarrier of the mth Orthogonal Frequency Division Multiplexing OFDM symbol

for

(k=0,1,...,N-1) in,

( k =0,1,..., N -1)

(k=0,1,...,N-1)

(k=0,1,...,N-1)

J₀為頻率偏差、定時偏差和相位雜訊對第k個子載波引入的公共相位偏差，J₀為相位雜訊對第k個子載波引入的公共相位加權因數，H_k第m個OFDM符號的為第k個子載波上的等效頻域通道回應，X_k第m個OFDM符號的為第k個子載波上發送的調變符號，W_k為第k個子載波上的複高斯雜訊，l為通道多徑分量的序號，L為通道多徑分量的數量，J_k-r為第(k-r)個樣值點的相位雜訊加權因數，N為OFDM符號對應的樣值點數，h_l為第l條通道多徑分量的相對幅度衰減，τ_l為第l條通道多徑分量的相位偏移，

為第l條通道多徑分量的傳播延遲，J_p為第p個樣值點的相位雜訊加權因數，

為m個OFDM符號的第n個樣值點上的相位雜訊，

為第m個OFDM符號上頻率偏差引入的公共相位偏差，

為第m個OFDM符號的第n個樣值點上頻率偏差引入的獨立相位偏差，n為樣值點序號，

為第q個OFDM符號的迴圈首碼對應的樣值點數。 Among them, m is the total number of orthogonal frequency division multiplexing OFDM symbols, k is the sequence number of the subcarrier, 1i is the imaginary unit, θ ^{m, 1} is the phase deviation caused by the frequency deviation, f _c is the center frequency of the carrier, △f _SCS is the subcarrier spacing, δf is the frequency deviation, △t is the timing deviation,

J ₀ is the common phase deviation introduced by frequency deviation, timing deviation and phase noise to the kth subcarrier, J ₀ is the common phase weighting factor introduced by phase noise to the kth subcarrier, H _{k is} the mth OFDM symbol The equivalent frequency domain channel response on the kth subcarrier, X _k the mth OFDM symbol is the modulation symbol sent on the kth subcarrier, W _k is the complex Gaussian noise on the kth subcarrier, and l is the channel The sequence number of the multipath component, L is the number of channel multipath components, J _kr is the phase noise weighting factor of the (kr)th sample point, N is the number of sample points corresponding to the OFDM symbol, and h _l is the lth sample point. The relative amplitude attenuation of the multipath component of the channel, τ _l is the phase shift of the multipath component of the l-th channel,

Is the propagation delay of the multipath component of the l- _{th channel, J p} is the phase noise weighting factor of the p-th sample point,

Is the phase noise at the nth sample point of m OFDM symbols,

Is the common phase deviation introduced by the frequency deviation on the m-th OFDM symbol,

Is the independent phase deviation introduced by the frequency deviation at the nth sample point of the mth OFDM symbol, where n is the sample point number,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol.

為

；k

{0,…,N-1} Further, the frequency domain equivalent received signal on the kth subcarrier of the mth OFDM symbol

for

;K

{0,...,N-1}

(k=0,1,...,N-1)，X_k為第m個OFDM符號的第k個子載波上發送的調變符號，W_k為第m個OFDM符號的第k個子載波上的複高斯雜訊。 Where H _k is the equivalent frequency domain channel response on the kth subcarrier of the mth OFDM symbol,

(k=0,1,...,N-1), X _k is the modulation symbol sent on the kth subcarrier _{of the mth OFDM symbol, and W k} is the kth subcarrier of the mth OFDM symbol Complex Gaussian noise.

Further, the positioning reference signal adopts the OFDM symbol waveform to be transmitted to the receiver after being transmitted through the channel.

The receiver in this embodiment can be used to execute the above corresponding method embodiments, and its principles and technical effects are similar, and will not be repeated here.

This embodiment discloses a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the above The method provided in the method embodiment.

This embodiment provides a non-transitory computer-readable storage medium that stores computer instructions that cause the computer to execute the methods provided in the foregoing method embodiments.

The device embodiments described above are merely illustrative, where the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one unit. Locally, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those with ordinary knowledge in the field can understand and implement it without making progressive labor.

Through the description of the above embodiments, those with ordinary knowledge in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be realized by hardware. Based on this understanding, the above technical solution essentially or the part that contributes to the previous technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk , CD-ROM, etc., including multiple commands to make a A brain device (which can be a personal computer, a server, or a network device, etc.) executes the methods in each embodiment or some parts of the embodiment.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features thereof are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

S101: Step flow

Claims (27)

A method for eliminating deviations of carrier phase measurement values, which includes: calculating the difference between a first single-differential carrier phase measurement value and a second single-differential carrier phase measurement value to obtain a dual-differential carrier phase measurement value that eliminates the deviation; wherein The first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation. The carrier phase measurement value deviation elimination method according to claim 1, wherein the first single differential carrier phase measurement value is the difference between a first carrier phase measurement value and a second carrier phase measurement value; the second single The differential carrier phase measurement value is the difference between a third carrier phase measurement value and a fourth carrier phase measurement value; wherein, the first carrier phase measurement value, the second carrier phase measurement value, and the third carrier phase measurement value Both the measured value of the fourth carrier phase and the measured value of the carrier phase carry the frequency deviation and the timing deviation. The method for eliminating deviation of carrier phase measurement values according to claim 2, wherein the first carrier phase measurement value is obtained by a first receiver by measuring a first reference signal sent by a first transmitter; the second carrier The phase measurement value is obtained by the first receiver by measuring a second reference signal sent by a second transmitter; the third carrier phase measurement value is obtained by a second receiver by measuring a third signal sent by the first transmitter The reference signal is obtained; the fourth carrier phase measurement value is obtained by the second receiver by measuring a fourth reference signal sent by the second transmitter. The carrier phase measurement value deviation elimination method according to claim 3, wherein the first carrier phase measurement value, the second carrier phase measurement value, the third carrier phase measurement value, and the fourth carrier phase measurement value are based on a Frequency deviation phase measurement value, certain time deviation phase measurement value, a propagation delay phase measurement value and a phase noise phase measurement value are calculated; wherein, the timing deviation phase measurement value and the propagation delay phase measurement value are based on the carrier The center frequency of is calculated. The method for eliminating deviations of carrier phase measurement values according to claim 4, wherein the first carrier phase measurement value

, The second carrier phase measurement value

, The third carrier phase measurement value

, The fourth carrier phase measurement value

Respectively obtained by the following formula:

Where a is the first receiver, b is the second receiver, i is the first transmitter, j is the second transmitter, m is the total number of orthogonal frequency division multiplexing OFDM symbols, and q is The sequence number of the OFDM symbol, 0

q

m-1, N is the number of sample points corresponding to the OFDM symbol,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol, f _c is the center frequency of the carrier,

Is the frequency deviation carried by the first carrier phase measurement value,

Is the frequency deviation carried by the second carrier phase measurement value,

Is the frequency deviation carried by the third carrier phase measurement value,

Is the frequency deviation carried by the fourth carrier phase measurement value,

Is the timing deviation carried by the first carrier phase measurement value,

Is the timing deviation carried by the second carrier phase measurement value,

Is the timing deviation carried by the third carrier phase measurement value,

Is the timing deviation carried by the fourth carrier phase measurement value,

Is the propagation delay carried by the first carrier phase measurement,

Is the propagation delay carried by the second carrier phase measurement,

Is the propagation delay carried by the third carrier phase measurement,

Is the propagation delay carried by the fourth carrier phase measurement,

Is the phase noise carried by the first carrier phase measurement value,

Is the phase noise carried by the second carrier phase measurement value,

Is the phase noise carried by the third carrier phase measurement value,

Is the phase noise carried by the fourth carrier phase measurement value. The carrier phase measurement deviation elimination method according to claim 5, wherein the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value is calculated to obtain a deviation-eliminated dual-differential carrier phase measurement When the value, the system includes: calculating the first single-differential carrier phase measurement value

And the second single differential carrier phase measurement

The difference value of, get the double differential carrier phase measurement value that eliminates the deviation

in,

Is the frequency deviation carried by the first single differential carrier phase measurement value,

Is the frequency deviation carried by the second single differential carrier phase measurement value,

Is the frequency deviation carried by the double differential carrier phase measurement value,

Is the timing deviation carried by the first single differential carrier phase measurement value,

Is the timing deviation carried by the second single differential carrier phase measurement value,

Is the timing deviation carried by the double differential carrier phase measurement value,

Is the propagation delay carried by the first single differential carrier phase measurement,

Is the propagation delay carried by the second single differential carrier phase measurement,

Is the propagation delay carried by the double differential carrier phase measurement,

Is the phase noise carried by the first single differential carrier phase measurement value,

Is the phase noise carried by the second single-differential carrier phase measurement value,

Is the phase noise carried by the double differential carrier phase measurement value,

. A method for obtaining carrier phase measurement values, which includes: receiving and measuring a positioning reference signal transmitted through a channel, obtaining a carrier phase measurement value carrying frequency deviation and timing deviation, and sending the carrier phase measurement value to a network Road side, so that the network side calculates the difference between a first single-differential carrier phase measurement value and a second single-differential carrier phase measurement value according to a carrier phase measurement value sent by the first receiver and the second receiver, Obtain a dual differential carrier phase measurement value that eliminates the deviation; wherein, the first single differential carrier phase measurement value and the second single differential carrier phase measurement value are respectively the difference between the two carrier phase measurement values, and the two carrier phases The measured values all carry frequency deviation and timing deviation. The method for obtaining carrier phase measurement value according to claim 7, wherein the carrier phase measurement value is calculated based on the frequency domain equivalent received signal of one or more subcarriers. The method for obtaining carrier phase measurement value according to claim 8, wherein the frequency domain equivalent received signal of the one or more subcarriers is calculated according to frequency deviation, timing deviation and equivalent frequency domain channel response; wherein, the timing deviation And the equivalent frequency domain channel response are calculated based on the center frequency of the carrier. The method for obtaining carrier phase measurement values according to claim 9, wherein the frequency domain equivalent received signal on the kth subcarrier of the mth orthogonal frequency division multiplexing OFDM symbol

for

in,

(k=0,1,...,N-1)

(k=0,1,...,N-1)

(p=0,1,...,N-1)

Among them, m is the total number of orthogonal frequency division multiplexing OFDM symbols, k is the sequence number of the subcarrier, 1i is the imaginary unit, θ ^{m, 1} is the phase deviation caused by the frequency deviation, f _c is the center frequency of the carrier, △ f _{SCS is} the subcarrier interval, δf is the frequency deviation, △t is the timing deviation,

J ₀ is the common phase deviation introduced by frequency deviation, timing deviation and phase noise to the k-th sub-carrier, J ₀ is the common phase weighting factor introduced by phase noise to the k-th sub-carrier, and H _k is the m-th sub-carrier. The equivalent frequency domain channel response on the kth subcarrier of the _{OFDM symbol, X k} is the modulation symbol sent on the kth subcarrier of the mth OFDM symbol, and W _k is the kth subcarrier For the complex Gaussian noise above, l is the sequence number of the channel multipath component, L is the number of the channel multipath component, J _kr is the phase noise weighting factor of the (kr)th sample point, and N is the sample corresponding to the OFDM symbol Value points, h _l is the relative amplitude attenuation of the multipath component of _{the l channel, τ l} is the phase offset of the multipath component of the l channel,

Is the propagation delay of the multipath component of the l- _{th channel, J p} is the phase noise weighting factor of the p-th sample point,

Is the phase noise at the nth sample point of m OFDM symbols,

Is the common phase deviation introduced by the frequency deviation on the m-th OFDM symbol,

Is the independent phase deviation introduced by the frequency deviation at the nth sample point of the mth OFDM symbol, where n is the sample point number,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol. The method for obtaining carrier phase measurement values according to claim 9 or 10, wherein the frequency domain equivalent received signal on the kth subcarrier of the mth OFDM symbol

for

;K

{0,...,N-1} where H _k is the equivalent frequency domain channel response on the kth subcarrier of the mth OFDM symbol,

(k=0,1,...,N-1), X _k is the k-th modulation symbol sent on the subcarrier of the m-th OFDM symbol _{, and W k is the k-th modulation symbol of the m-th OFDM symbol} Complex Gaussian noise on this subcarrier. According to the method for obtaining the measured value of the carrier phase according to claim 9 or 10, the positioning reference signal adopts an OFDM symbol waveform to be transmitted through a channel and then is sent to a receiver. A deviation elimination device for carrier phase measurement values, comprising: a deviation elimination module for calculating the difference between a first single-differential carrier phase measurement value and a second single-differential carrier phase measurement value to obtain a deviation elimination Double differential carrier phase measurement value; wherein, the first single differential carrier phase measurement value and the second single differential carrier phase measurement value are respectively the difference between two carrier phase measurement values, and the two carrier phase measurement values both carry frequency Deviation and timing deviation. A carrier phase measurement value acquisition device, which includes: a phase measurement module for receiving and measuring a positioning reference signal transmitted through a channel, obtaining a carrier phase measurement value carrying frequency deviation and timing deviation, and combining the The carrier phase measurement value is sent to a network side, so that the network side calculates a first single-differential carrier phase measurement value and a second single-differential carrier phase measurement value based on the carrier phase measurement values sent by the first receiver and the second receiver The difference of the measured value of the carrier phase to obtain a pair of differential carrier phase measured values that eliminate the deviation; Wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation. A receiver includes a memory, a processor, and a computer program that is stored on the memory and can run on the processor, wherein the processor executes the following steps when the computer program is run: calculate a first order The difference between the measured value of the differential carrier phase and the measured value of a second single-differential carrier phase is a double-differential carrier phase measurement value that eliminates the deviation; wherein, the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value The measured values are respectively the difference between the two carrier phase measured values, and the two carrier phase measured values both carry frequency deviation and timing deviation. The receiver according to claim 15, wherein the first single differential carrier phase measurement value is the difference between a first carrier phase measurement value and a second carrier phase measurement value; the second single differential carrier phase measurement value is The difference between a third carrier phase measurement value and a fourth carrier phase measurement value; wherein the first carrier phase measurement value, the second carrier phase measurement value, the third carrier phase measurement value, and the fourth carrier phase measurement value The measured values are all carrier phase measurement values that carry frequency deviation and timing deviation. The receiver according to claim 16, wherein the first carrier phase measurement value is obtained by a first receiver by measuring a first reference signal sent by a first transmitter; the second carrier phase measurement value is the first A receiver is obtained by measuring a second reference signal sent by a second transmitter; the third carrier phase measurement value is obtained by a second receiver by measuring a third reference signal sent by the first transmitter; The fourth carrier phase measurement value is obtained by the second receiver by measuring a fourth reference signal sent by the second transmitter. The receiver according to claim 17, wherein the first carrier phase measurement value, the second carrier phase measurement value, the third carrier phase measurement value, and the fourth carrier phase measurement value are based on a frequency deviation phase measurement value, A certain time deviation phase measurement value, a propagation delay phase measurement value and a phase noise phase measurement value are calculated; wherein, the timing deviation phase measurement value and the propagation delay phase measurement value are calculated based on the center frequency of the carrier. The receiver according to claim 18, wherein the first carrier phase measurement value

, The second carrier phase measurement value

, The third carrier phase measurement value

, The fourth carrier phase measurement value

Respectively obtained by the following formula:

Where a is the first receiver, b is the second receiver, i is the first transmitter, j is the second transmitter, m is the total number of orthogonal frequency division multiplexing OFDM symbols, and q is The sequence number of the OFDM symbol, 0

q

m-1, N is the number of sample points corresponding to the OFDM symbol,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol, f _c is the center frequency of the carrier,

Is the frequency deviation carried by the first carrier phase measurement value,

Is the frequency deviation carried by the second carrier phase measurement value,

Is the frequency deviation carried by the third carrier phase measurement value,

Is the frequency deviation carried by the fourth carrier phase measurement value,

Is the timing deviation carried by the first carrier phase measurement value,

Is the timing deviation carried by the second carrier phase measurement value,

Is the timing deviation carried by the third carrier phase measurement value,

Is the timing deviation carried by the fourth carrier phase measurement value,

Is the propagation delay carried by the first carrier phase measurement,

Is the propagation delay carried by the second carrier phase measurement,

Is the propagation delay carried by the third carrier phase measurement,

Is the propagation delay carried by the fourth carrier phase measurement,

Is the phase noise carried by the first carrier phase measurement value,

Is the phase noise carried by the second carrier phase measurement value,

Is the phase noise carried by the third carrier phase measurement value,

Is the phase noise carried by the fourth carrier phase measurement value. The receiver according to claim 19, wherein calculating the difference between the first single-differential carrier phase measurement value and the second single-differential carrier phase measurement value to obtain the double-differential carrier phase measurement value that eliminates the deviation, specifically includes: Calculate the first single differential carrier phase measurement value

And the second single differential carrier phase measurement

The difference value of the double differential carrier phase measurement value that eliminates the deviation is obtained

in,

Is the frequency deviation carried by the first single differential carrier phase measurement value,

Is the frequency deviation carried by the second single differential carrier phase measurement value,

Is the frequency deviation carried by the double differential carrier phase measurement value,

Is the timing deviation carried by the first single differential carrier phase measurement value,

Is the timing deviation carried by the second single differential carrier phase measurement value,

Is the timing deviation carried by the double differential carrier phase measurement value,

Is the propagation delay carried by the first single differential carrier phase measurement,

Is the propagation delay carried by the second single differential carrier phase measurement,

Is the propagation delay carried by the double differential carrier phase measurement,

Is the phase noise carried by the first single differential carrier phase measurement value,

Is the phase noise carried by the second single-differential carrier phase measurement value,

Is the phase noise carried by the double differential carrier phase measurement value,

. A receiver includes a memory, a processor, and a computer program that is stored on the memory and can run on the processor, wherein the processor executes the following steps when the processor runs the computer program: receiving and measuring passing channels After transmitting a positioning reference signal, a carrier phase measurement value carrying frequency deviation and timing deviation is obtained, and the carrier phase measurement value is sent to a network side, so that the network side can respond according to the first receiver and the second receiver. The carrier phase measurement value sent by the receiver calculates the difference between a first single-differential carrier phase measurement value and a second single-differential carrier phase measurement value to obtain a double-differential carrier phase measurement value that eliminates the deviation; wherein, the first The single-differential carrier phase measurement value and the second single-differential carrier phase measurement value are respectively the difference of two carrier phase measurement values, and the two carrier phase measurement values both carry frequency deviation and timing deviation. The receiver according to claim 21, wherein the carrier phase measurement value is calculated based on the frequency domain equivalent received signal of one or more subcarriers. The receiver according to claim 22, wherein the frequency domain equivalent reception signal of the one or more subcarriers is calculated according to frequency deviation, timing deviation and equivalent frequency domain channel response; wherein, the timing deviation and the equivalent frequency domain The channel response is calculated based on the center frequency of the carrier. The receiver according to claim 23, wherein the frequency domain equivalent received signal on the kth subcarrier of the mth Orthogonal Frequency Division Multiplexing OFDM symbol

for

in,

(k=0,1,...,N-1)

(k=0,1,...,N-1)

(p=0,1,...,N-1)

Among them, m is the total number of orthogonal frequency division multiplexing OFDM symbols, k is the sequence number of the subcarrier, 1i is the imaginary unit, θ ^{m, 1} is the phase deviation caused by the frequency deviation, f _c is the center frequency of the carrier, △ f _{SCS is} the subcarrier interval, δf is the frequency deviation, △t is the timing deviation,

J ₀ is the common phase deviation introduced by frequency deviation, timing deviation and phase noise to the k-th sub-carrier, J ₀ is the common phase weighting factor introduced by phase noise to the k-th sub-carrier, and H _k is The equivalent frequency domain channel response on the kth subcarrier _{of the m OFDM symbols, X k} is the modulation symbol sent on the kth subcarrier of the m OFDM symbol _{, and W k is the mth OFDM symbol} The kth complex Gaussian noise on this subcarrier, l is the sequence number of the channel multipath component, L is the number of channel multipath components, J _kr is the phase noise weighting factor of the (kr)th sample point, N is the number of sample points corresponding to the OFDM symbol, h _l is the relative amplitude attenuation of the multipath component of _{the l channel, τ l} is the phase offset of the multipath component of the l channel,

Is the propagation delay of the multipath component of the l- _{th channel, J p} is the phase noise weighting factor of the p-th sample point,

Is the phase noise at the nth sample point of m OFDM symbols,

Is the common phase deviation introduced by the frequency deviation on the m-th OFDM symbol,

Is the independent phase deviation introduced by the frequency deviation at the nth sample point of the mth OFDM symbol, where n is the sample point number,

Is the number of sample points corresponding to the loop first code of the qth OFDM symbol. The receiver according to claim 23 or 24, wherein the frequency domain equivalent received signal on the kth subcarrier of the mth Orthogonal Frequency Division Multiplexing OFDM symbol

for

;K

{0,...,N-1} where H _k is the equivalent frequency domain channel response on the kth subcarrier of the mth OFDM symbol,

(k=0,1,...,N-1), X _k is the k-th modulation symbol sent on the subcarrier of the m-th OFDM symbol _{, and W k is the k-th modulation symbol of the m-th OFDM symbol} Complex Gaussian noise on this subcarrier. The receiver according to claim 23 or 24, wherein the positioning reference signal adopts a waveform of an OFDM symbol and is transmitted to a receiver after being transmitted through a channel. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the computer program is executed by a processor to realize the method for eliminating deviation of the carrier phase measurement value according to any one of claim items 1 to 6; And/or the method for obtaining carrier phase measurement values as described in any one of Claims 7 to 12.

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