WO2017084350A1

WO2017084350A1 - Method and apparatus for determining distance of first reflection point from radio frequency unit

Info

Publication number: WO2017084350A1
Application number: PCT/CN2016/088214
Authority: WO
Inventors: 侯晓辉; 姚幸林; 杨锋
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-11-19
Filing date: 2016-07-01
Publication date: 2017-05-26
Also published as: CN106771845A; CN106771845B

Abstract

A method and apparatus for determining the distance of a first reflection point from a radio frequency unit, the method comprising: calculating the time delay of a reflected wave signal relative to a transmitted wave signal (S101); and, on the basis of the time delay and the transmission rate of the signal at a radio frequency unit, calculating the distance of a first reflection position relative to a transmitting port of the radio frequency unit (S102).

Description

Method and apparatus for determining the distance of a first reflection point from a radio frequency unit

Technical field

The present application relates to, but is not limited to, the field of mobile communications, and in particular, to a method and apparatus for determining a distance of a first reflection point from a radio frequency unit.

Background technique

When designing an RF system, it is generally desirable that the antenna can transmit signals to the wireless space with maximum efficiency, that is, it is desirable that the reflection coefficient of the RF signal at the antenna port be as small as possible. On the one hand, when the feeder is good, the RF signal will be reflected from the antenna and the feeder connection. Therefore, the first reflection point at this time is at this connection. In this case, the position of the first reflection point is calculated, and the actual equivalent is calculated. The length of the feeder between the RF unit and the antenna. Determining the length of the feeder is beneficial to guide the engineering budget and engineering construction when the RF system is modified, especially when the antenna is added. On the other hand, from the perspective of troubleshooting, when the feeder is damaged at a certain position in the middle, at the point of failure The position generates a reflected wave, and the first reflection point at this time is located at the fault position. Therefore, in this case, the position of the first reflection point is calculated, and the position where the feeder has a problem can be accurately found.

It can be seen from the above analysis that determining the position of the first reflection point has a great positive effect. However, the related method of determining the position of the first reflection point requires multi-tone sweeping within the power amplifier band, which causes a service interruption when the frequency is swept.

There is currently no effective solution to the problem that causes service interruption when determining the position of the first reflection point.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a method and a device for determining the distance between the first reflection point and the radio frequency unit, which can solve the problem that the service interruption is caused when the position of the first reflection point is determined.

A method for determining a distance of a first reflection point from a radio frequency unit, comprising: calculating a time delay of the reflected wave signal relative to the transmitted wave signal; and calculating a first time according to the transmission rate of the time delay and the signal in the radio frequency unit The distance of the reflection position from the transmitting port of the radio unit.

Optionally, calculating a time delay of the reflected wave signal relative to the transmitted wave signal includes: transforming the transmitted wave signal in the time domain to a continuous frequency domain to obtain a frequency domain transmitted wave signal; and transforming the reflected wave signal in the time domain to the continuous frequency domain Obtaining a frequency domain reflected wave signal; obtaining a ratio of the frequency domain reflected wave signal to the frequency domain transmitted wave signal as a frequency domain response signal; discretizing the frequency domain response signal to obtain a discrete response signal; The phase angle of the discrete response signal is calculated to obtain the time delay of the reflected wave signal relative to the transmitted wave signal.

Optionally, calculating, according to the phase angle of the discrete response signal, the delay of the reflected wave signal relative to the transmitted wave signal comprises: calculating, according to a phase angle of the discrete response signal, according to a preset first relationship Delay.

The first relationship includes:

Where τ represents the time delay of the reflected wave signal relative to the transmitted wave signal, N represents the number of sample points of the discretized sample, and T _s represents the sampling interval of the discretized sample,

Indicates the phase angle.

Optionally, performing discretization sampling on the frequency domain response signal includes: acquiring a bandwidth of the frequency domain response signal; determining a sampling rate according to the bandwidth, and performing digital sampling according to the determined sampling rate, where the sampling rate Meet the preset second relationship.

The second relationship includes:

Where f _s represents the sampling rate of the discretized samples, T _s represents the sampling interval of the discretized samples, and BW represents the bandwidth.

Optionally, calculating a time delay of the reflected wave signal relative to the transmitted wave signal includes: performing autocorrelation processing on the reflected wave signal and the transmitted wave signal; taking a time delay corresponding to a maximum peak value in the autocorrelation processing result as a The time delay of the reflected wave signal relative to the transmitted wave signal.

Optionally, the method further includes: calculating, according to a preset third relationship, a distance of the first reflective position from the radio frequency unit transmit port.

The third relationship includes:

Where L represents the distance of the first reflection position relative to the radio frequency unit transmission port, v represents the transmission rate of the signal at the radio frequency unit, and τ represents the time delay of the reflected wave signal relative to the transmitted wave signal.

An apparatus for determining a distance of a first reflection point from a radio frequency unit, comprising: a delay determination module and a distance determination module.

a delay determining module configured to calculate a time delay of the reflected wave signal relative to the transmitted wave signal; the distance determining module is configured to calculate, according to the delay and the transmission rate of the signal at the radio frequency unit, the first reflective position relative to the radio frequency The distance from the unit's transmit port.

Optionally, the time delay determining module includes: a first transform unit, a second transform unit, a frequency response determining unit, a sampling unit, and a delay determining unit.

The delay determining module calculates a delay of the reflected wave signal relative to the transmitted wave signal, including:

The first transform unit is configured to transform the transmit wave signal in the time domain into a continuous frequency domain to obtain a frequency domain transmit wave signal; and the second transform unit is configured to transform the reflected wave signal in the time domain into a continuous frequency domain to obtain a frequency domain. a reflected wave signal; the frequency response determining unit is configured to obtain a ratio of the frequency domain reflected wave signal to the frequency domain transmitted wave signal as a frequency domain response signal; and the sampling unit is configured to perform discrete sampling on the frequency domain response signal, Obtaining a discrete response signal; the delay determining unit is configured to calculate a time delay of the reflected wave signal relative to the transmitted wave signal according to a phase angle of the discrete response signal.

Optionally, the delay determining unit calculates, according to the phase angle of the discrete response signal, the delay of the reflected wave signal relative to the transmitted wave signal, according to the phase angle of the discrete response signal, according to the preset first The relational calculation yields the delay.

The first relationship includes:

Indicates the phase angle.

Optionally, the sampling unit includes: a bandwidth acquisition subunit and a sampling subunit.

The discretizing sampling of the frequency domain response signal by the sampling unit includes:

a bandwidth acquisition subunit, configured to acquire a bandwidth of the frequency domain response signal; a sampling subunit configured to determine a sampling rate according to the bandwidth, and perform digital sampling according to the determined sampling rate, wherein the sampling rate satisfies a preset The second relationship.

The second relationship includes:

Optionally, the delay determining module includes: an autocorrelation unit and a computing unit.

An autocorrelation unit configured to perform autocorrelation processing on the reflected wave signal and the transmitted wave signal; and a calculating unit configured to maximize a peak value in the autocorrelation processing result, and the corresponding time delay is used as the reflected wave signal as opposed to The delay of the transmitted wave signal.

Optionally, the distance determining module is further configured to: calculate a distance of the first reflective position from the radio frequency unit transmit port according to a preset third relationship.

The third relationship includes:

A computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the method of determining a distance of a first reflection point from a radio frequency unit.

In the embodiment of the present invention, by calculating the delay of the reflected wave signal relative to the transmitted wave signal, after determining the time delay, according to the principle that the distance is the product of the rate and the time, the first reflection can be determined by combining the transmission rate of the signal in the radio frequency unit. The distance of the position relative to the transmitting port of the radio unit, ie the position of the first reflection point. In the above manner, the related art determines that the position of the first reflection point is determined The problem of business interruption achieves the technical effect of effectively determining the position of the first reflection point without causing service interruption, so that the feeder can be found to have a fault in time.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a preferred flowchart of a method for determining a distance of a first reflection point from a radio frequency unit in an embodiment of the present invention;

2 is a block diagram showing a preferred structure of a method for determining a distance between a first reflection point and a radio frequency unit in an embodiment of the present invention;

3 is a schematic diagram of a first reflection point at a feeder line and an antenna interface in an embodiment of the present invention;

4 is a schematic diagram of a first reflection point in a position in the middle of a feeder line in an embodiment of the present invention;

FIG. 5 is a schematic diagram of a baseband spectrum of a sounding signal in an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

The embodiment of the present invention provides a method for determining the distance between the first reflection point and the radio frequency unit. The embodiments of the present invention are described in detail below with reference to the accompanying drawings and the two embodiments. It is to be understood that the embodiments described herein are merely illustrative of the embodiments of the invention,

The embodiment of the invention provides a method for determining the distance between the first reflection point and the radio frequency unit. The flow of the method is as shown in FIG. 1 and includes steps S101 to S102:

Step 101: Calculate a time delay of the reflected wave signal relative to the transmitted wave signal.

Step 102: Calculate, according to the delay and the transmission rate of the signal at the radio frequency unit, a distance between the first reflection position and the radio frequency unit transmission port.

In this example, two methods for determining latency are provided:

Method 1: Solve in the time domain

The method may include: performing autocorrelation processing on the reflected wave signal and the transmitted wave signal, and then using the time delay corresponding to the peak value in the autocorrelation processing result as the time delay of the reflected wave signal relative to the transmitted wave signal.

Method 2: Solve in the frequency domain

That is, the factor of the delay is converted to the phase in the frequency domain, and then the delay is obtained by the phase calculation.

The time domain transmit wave signal may be first transformed into a continuous frequency domain to obtain a frequency domain transmitted wave signal; the time domain reflected wave signal is transformed into a continuous frequency domain to obtain a frequency domain reflected wave signal; and then, the frequency domain reflected wave is obtained. The ratio of the signal to the frequency domain transmitted wave signal is used as the frequency domain response signal; the frequency domain response signal is discretized and sampled to obtain a discrete response signal; finally, the reflected wave signal is calculated relative to the transmitted wave signal according to the phase angle of the discrete response signal. Delay.

For example, suppose the transmitted wave signal is s(t) and the reflected wave signal is r(t), where r(t)=s(t)+c·s(t-τ).

Transforming the transmitted wave signal and the reflected wave signal into a continuous frequency domain, you can get:

s(t)=S(f)

R(f)=S(f)+c·S(f)e ^-j2πfτ

Finding the frequency domain response signal can be expressed as:

By performing the spatial sampling on the frequency domain response signal, you can get:

Where N represents the number of sampling points, Δf represents the resolution of the FFT transform, c represents the complex reflection coefficient, and τ represents the time delay of the reflected wave signal relative to the transmitted wave signal.

Indicates the phase corresponding to the complex reflection coefficient.

make

Then you can convert it to:

Therefore, it is inferred that:

Considering the sampling rate for signals with a bandwidth of BW

When sampling N points, where f _s represents the sampling rate of the discretized samples, T _s represents the sampling interval of the discretized samples, and BW represents the bandwidth. When f _{s is} determined, the resolution Δf of its FFT can be expressed as

Substituting it into the above delay expression gives you:

Indicates the phase angle.

Therefore, the delay can be obtained by the relationship.

In the above step 102, the distance between the first reflection position and the transmitting port of the radio frequency unit can be calculated according to the following relationship:

However, it is worth noting that the above two methods for determining the delay are not the only methods for determining the delay, and other methods for determining the delay may be used, and which method may be selected according to actual needs. The comparison is not limited.

In the embodiment, a device for determining the distance between the first reflection point and the radio frequency unit is further provided, and the device is configured to implement the foregoing embodiment and the optional implementation manner, and details are not described herein. As used below, the term "unit" or "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated. 2 is a block diagram of a preferred structure of an apparatus for determining a distance of a first reflection point from a radio frequency unit according to an embodiment of the present invention. As shown in FIG. 2, the method may include:

The delay determination module 201 is configured to calculate a time delay of the reflected wave signal relative to the transmitted wave signal.

The distance determining module 202 is configured to calculate a distance of the first reflective position from the radio frequency unit transmit port according to the delay and the transmission rate of the signal at the radio frequency unit.

Optionally, the delay determining module 201 may include: a first transform unit, a second transform unit, a frequency response determining unit, a sampling unit, and a delay determining unit.

Optionally, the delay determining unit calculates a delay of the reflected wave signal relative to the transmitted wave signal according to the phase angle of the discrete response signal, where the delay determining unit is configured according to the phase angle of the discrete response signal. The first relation is calculated to calculate the delay.

The first relationship includes:

Indicates the phase angle.

Optionally, the sampling unit may include: a bandwidth acquiring subunit and a sampling subunit.

The second relationship includes:

Optionally, the delay determining module 201 may include: an autocorrelation unit and a computing unit.

Optionally, the distance determining module 202 is further configured to: calculate a distance of the first reflective position from the radio frequency unit transmit port according to the preset third relationship.

The third relationship includes:

Alternative embodiment

In order to calculate the position of the first reflection point without interrupting the service, in order to determine in time whether the position of the first reflection point is located at the antenna and the feeder interface, it is determined whether the intermediate position of the feeder is damaged. In this example, a method for determining the position of the first reflection point between the radio frequency unit and the antenna is proposed. As shown in FIG. 3, when the feeder line is good, the first reflection point is located at the antenna and the feeder interface, assuming that the interface is located. Coordinate origin O, as shown in Figure 4, when the feeder is in a position in the middle When it is damaged, the reflection of electromagnetic waves will be emitted at this point.

The solution for determining the position of the first reflection point provided by the embodiment is: calculating the time delay of the reflected wave signal relative to the transmitted wave signal, and further deriving the first reflection position relative to the radio frequency according to the relationship that the distance is the product of the rate and the time. The distance from the unit's transmit port. In this example, setting v indicates the rate at which the signal propagates in the feeder (ie, the propagation speed of the signal at the radio unit), which is typically less than the speed of light. The baseband working bandwidth of the wireless system to be tested (ie, the bandwidth of the sounding signal) is BW (Hz), as shown in FIG. 5 is a schematic diagram of the baseband spectrum of the sounding signal.

The baseband digital detection signal generating module generates the detected baseband digital signal s(nT _s ), and after s (nT _s ) is processed by the intermediate frequency processing such as sampling, the digital baseband is converted into an analog baseband signal by the DAC, and the analog baseband signal is generated by the RF processing unit. The signal s(t), s(t) is sent to the antenna port, and the antenna converts this signal into an electromagnetic wave in the wireless space to radiate in the wireless space.

According to the principle of electromagnetic wave transmission, the complex amplitude of the electromagnetic wave in the reflection zone can be expressed as: Ae ^jz + Be ^-jz , which is equivalent to the processing of the signal, and the received signal r(t) of the reflection zone can be expressed as:

r(t)=s(t)+c·s(t-τ)

There are two main algorithms for calculating the delay τ:

The first kind is solved in the time domain. The solution method is to find the autocorrelation between the transmitted signal and the reflected signal. When the correlation peak is maximum, the corresponding time delay τ is the delay caused by the reflection from the first reflection point. Obviously, this method It is necessary to design a training signal s(t) with good autocorrelation properties. The second type is solved in the frequency domain, and the factor of the delay τ is converted to the phase, and the delay τ is obtained by the calculation of the phase.

If you consider the calculation is simple, choose the second method, the frequency domain solution method.

By transforming r(t)=s(t)+c·s(t-τ) into the continuous frequency domain, you can get:

R(f)=S(f)+c·S(f)e ^-j2πfτ

make

Discrete sampling of the continuous frequency domain, you can get:

make

This can be obtained:

Optionally, for a signal with a bandwidth of BW, the selection of f _s needs to satisfy the sampling theorem of the Nyquist first criterion, and therefore, the sampling rate can be

When sampling N points, if you want to increase the resolution of the distance calculation, you need to increase the sampling rate f _s , f _s can be selected according to the need of precision and the sampling frequency of the ADC and DAC.

When f _{s is} determined, the resolution Δf of its FFT can be expressed as:

will

Substituting the above delay relationship can be obtained:

Therefore, it is finally determined that the above relationship can be used to calculate the delay.

After determining the delay, the distance between the position of the first reflection point and the radio unit can be calculated according to the following relationship:

For example, taking BAND26 as an example, the frequency range of the radio frequency unit that the base station transmits the signal is 859MHz-894MHz, and the transmission rate of the signal in the radio frequency unit is v=0.8c=2.4×10 ⁸ m/s, the bandwidth BW=20MHz, sampling. interval

Then, by substituting these parameters into the relationship between the above-mentioned delay and the above-mentioned distance finding, the distance of the first reflection point from the radio frequency unit can be obtained.

In the above manner, the first reflection point distance can be determined without interrupting the related service. The distance from the radio unit and the algorithm is simple, which facilitates rapid deployment.

In summary, the embodiment of the present invention calculates the delay of the reflected wave signal relative to the transmitted wave signal. After determining the time delay, according to the principle that the distance is the product of the rate and the time, the transmission rate of the combined signal in the radio frequency unit can be The distance of the first reflection position relative to the RF unit transmission port, that is, the position of the first reflection point, is determined. The above problem solves the problem that the service of the first reflection point is determined to be interrupted when the position of the first reflection point is determined in the related art, and the technical effect of effectively determining the position of the first reflection point without causing service interruption can be solved, so that it can be found in time. Whether the feeder is faulty.

It will be apparent to those skilled in the art that each of the above-described modules or steps of the present invention can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into a plurality of integrated circuit modules, or a plurality of the modules or steps are fabricated as a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Although alternative embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible. Therefore, the scope of embodiments of the present invention should not be limited to the embodiments described above.

Industrial applicability

In the embodiment of the present invention, by calculating the delay of the reflected wave signal relative to the transmitted wave signal, after determining the time delay, according to the principle that the distance is the product of the rate and the time, the first reflection can be determined by combining the transmission rate of the signal in the radio frequency unit. The distance of the position relative to the transmitting port of the radio unit, ie the position of the first reflection point. The above problem solves the problem that the service of the first reflection point is determined to be interrupted when the position of the first reflection point is determined in the related art, and the technical effect of effectively determining the position of the first reflection point without causing service interruption can be solved, so that it can be found in time. Whether the feeder is faulty.

Claims

A method for determining a distance of a first reflection point from a radio frequency unit, comprising:

Calculating a time delay of the reflected wave signal relative to the transmitted wave signal;

And calculating, according to the delay and the transmission rate of the signal at the radio frequency unit, a distance of the first reflection position from the radio frequency unit transmission port.
The method for determining a distance of a first reflection point from a radio frequency unit according to claim 1, wherein the calculating a time delay of the reflected wave signal relative to the transmitted wave signal comprises:

Transmitting a transmitted wave signal in a time domain to a continuous frequency domain to obtain a frequency domain transmitted wave signal;

Transforming the reflected wave signal in the time domain into a continuous frequency domain to obtain a frequency domain reflected wave signal;

Obtaining a ratio of a frequency domain reflected wave signal to a frequency domain transmitted wave signal as a frequency domain response signal;

Discretizing the frequency domain response signal to obtain a discrete response signal;

Calculating a time delay of the reflected wave signal relative to the transmitted wave signal according to the phase angle of the discrete response signal.
The method for determining a distance of a first reflection point from a radio frequency unit according to claim 2, wherein the calculating the delay of the reflected wave signal relative to the transmitted wave signal according to the phase angle of the discrete response signal comprises:

Calculating the delay according to a preset first relationship according to a phase angle of the discrete response signal;

The first relationship includes:

Where τ represents the time delay of the reflected wave signal relative to the transmitted wave signal, N represents the number of sample points of the discretized sample, and T s represents the sampling interval of the discretized sample,
Indicates the phase angle.
The method of determining a distance of a first reflection point from a radio frequency unit according to claim 2, wherein said discretizing sampling of said frequency domain response signal comprises:

Obtaining a bandwidth of the frequency domain response signal;

Determining a sampling rate according to the bandwidth, performing digital sampling according to the determined sampling rate, wherein the sampling rate satisfies a preset second relationship;

The second relationship includes:

Where f s represents the sampling rate of the discretized samples, T s represents the sampling interval of the discretized samples, and BW represents the bandwidth.
The method for determining a distance of a first reflection point from a radio frequency unit according to claim 1, wherein the calculating a time delay of the reflected wave signal relative to the transmitted wave signal comprises:

Performing autocorrelation processing on the reflected wave signal and the transmitted wave signal;

The time delay corresponding to the peak value in the autocorrelation processing result is taken as the time delay of the reflected wave signal with respect to the transmitted wave signal.
The method for determining a distance of a first reflection point from a radio frequency unit according to any one of claims 1 to 5, further comprising: calculating a first reflection position relative to a radio frequency unit transmission port according to a preset third relation the distance;

The third relationship includes:

Where L represents the distance of the first reflection position relative to the radio frequency unit transmission port, v represents the transmission rate of the signal at the radio frequency unit, and τ represents the time delay of the reflected wave signal relative to the transmitted wave signal.
An apparatus for determining a distance of a first reflection point from a radio frequency unit, comprising: a delay determination module and a distance determination module;

The delay determining module is configured to calculate a time delay of the reflected wave signal relative to the transmitted wave signal;

The distance determining module is configured to calculate, according to the delay and the transmission rate of the signal at the radio frequency unit, a distance of the first reflection position from the radio frequency unit transmission port.
The apparatus for determining a distance of a first reflection point from a radio frequency unit according to claim 7, wherein the delay determination module comprises: a first transformation unit, a second transformation unit, a frequency response determination unit, a sampling unit and a delay determining unit;

The delay determining module calculates a delay of the reflected wave signal relative to the transmitted wave signal, including:

The first transform unit is configured to transform a time domain transmit wave signal into a continuous frequency domain to obtain a frequency domain transmit wave signal;

The second transform unit is configured to transform the reflected wave signal in the time domain into a continuous frequency domain to obtain a frequency domain reflected wave signal;

The frequency response determining unit is configured to obtain a ratio of a frequency domain reflected wave signal to a frequency domain transmitted wave signal as a frequency domain response signal;

The sampling unit is configured to perform discrete sampling on the frequency domain response signal to obtain a discrete response signal;

The delay determining unit is configured to calculate a time delay of the reflected wave signal relative to the transmitted wave signal according to a phase angle of the discrete response signal.
The apparatus for determining a distance of a first reflection point from a radio frequency unit according to claim 8, wherein the delay determination unit calculates a delay of the reflected wave signal relative to the transmitted wave signal according to a phase angle of the discrete response signal. include:

Calculating the delay according to a preset first relationship according to a phase angle of the discrete response signal;

The first relationship includes:

Where τ represents the time delay of the reflected wave signal relative to the transmitted wave signal, N represents the number of sample points of the discretized sample, and T s represents the sampling interval of the discretized sample,
Indicates the phase angle.
The apparatus for determining a distance of a first reflection point from a radio frequency unit according to claim 8, wherein the sampling unit comprises: a bandwidth acquisition subunit and a sampling subunit;

The discretizing sampling of the frequency domain response signal by the sampling unit includes:

The bandwidth acquisition subunit is configured to acquire a bandwidth of the frequency domain response signal;

The sampling subunit is configured to determine a sampling rate according to the bandwidth, and perform digital sampling according to the determined sampling rate, where the sampling rate satisfies a preset second relationship;

The second relationship includes:

Where f s represents the sampling rate of the discretized samples, T s represents the sampling interval of the discretized samples, and BW represents the bandwidth.
The apparatus for determining a distance of a first reflection point from a radio frequency unit according to claim 7, wherein the delay determination module comprises: an autocorrelation unit and a calculation unit;

The delay determining module calculates a delay of the reflected wave signal relative to the transmitted wave signal, including:

The autocorrelation unit is configured to perform autocorrelation processing on the reflected wave signal and the transmitted wave signal;

The calculating unit is configured to use a time delay corresponding to a peak value in the autocorrelation processing result as a time delay of the reflected wave signal with respect to the transmitted wave signal.
The apparatus for determining a distance of a first reflection point from a radio frequency unit according to any one of claims 6 to 11, wherein the distance determination module is further configured to: calculate a first reflection position relative to a radio frequency according to a preset third relation The distance from the unit's transmit port;

The third relationship includes:

Where L represents the distance of the first reflection position relative to the radio frequency unit transmission port, v represents the transmission rate of the signal at the radio frequency unit, and τ represents the time delay of the reflected wave signal relative to the transmitted wave signal.
A computer readable storage medium storing computer executable instructions, the method of determining a distance of a first reflection point from a radio frequency unit according to any one of claims 1 to 6 when executed by a processor .