KR101735779B1 - Method for processing range-gate signal and sensing apparatus using the method - Google Patents

Abstract

A range-gate signal processing method and a sensing device using the same are provided. Sequentially scans a plurality of range gates for receiving the signal of the detection area in a predetermined time unit, and receives the range gate signal in a section corresponding to each range gate. If the received range gate signal is greater than or equal to a preset first threshold value, it is determined that the corresponding range gate signal is a trigger signal. And obtains a predetermined number of range gate signals for the corresponding range gate from which the trigger signal is received.

Description

TECHNICAL FIELD The present invention relates to a range gate signal processing method and a sensing method using the same,

The present invention relates to signal processing, and more particularly, to a range-gate signal processing method and a sensing apparatus using the same.

In general, Ultra-wideband (UWB) communication enables high-speed data communication at close range due to a very wide bandwidth in a wireless communication system. On the sensor side, the UWB sensor also has the advantages of higher penetration power and higher distance resolution than the narrow-band microwave sensor. For example, the distance resolution of a UWB sensor can range from a few millimeters to several meters depending on the application range.

In case of UWB sensor monitoring, it is necessary to detect the wall characteristics of the wall in the environment where the UWB sensor is installed, to detect the intruder movement behind the wall, and to acquire the location information of the intruder in the general room. And a range-gate technique.

However, since the transmission power corresponding to the UWB band is about -41.3 dBm, it is very difficult to construct a high-performance sensing system because it uses signals that are 1,000,000 times weaker than 20 dBm transmission power of a general wireless LAN. In particular, when implementing a sensor system using a UWB sensor, there is a strong price limit. Therefore, a super-regenerative method (ie, a super-regenerative method) is used instead of an expensive high-performance superheterodyne .

The superheterodyne scheme has good performance but is expensive and not suitable for low power operation because it uses multilevel frequency conversion and many additional factors. On the other hand, the super regenerative system can be implemented with low power because the system is simpler and lower cost than other structures and the operation method is also turned off according to the quench signal for a certain time.

In a device using a gated-gate technique, the probability of determining that a system alarm (false alarm), that is, an intrusion that is not an intrusion, is determined according to the signal processing method of each range gate is determined. Generally, in the past, a range gate was applied to each distance, and a signal that is reflected from the surrounding background was removed from the range gate in order to acquire an accurate range gate signal. However, when such a signal processing method is used, there is a disadvantage that an error rate increases.

A problem to be solved by the present invention is to provide a method for selectively processing signals of only an arbitrary range gate based on a trigger signal in a sensing device operating on a range-gate basis and a sensing device using the method .

A method of processing a range gate signal according to an embodiment of the present invention includes sequentially scanning a plurality of range gates for receiving a signal in a sensing area on a predetermined time basis and receiving a range gate signal in a section corresponding to each range gate ; Determining that the corresponding range gate signal is a trigger signal when the received range gate signal is greater than or equal to a preset first threshold value; And obtaining a predetermined number of range gate signals for the corresponding range gate from which the trigger signal is received.

The acquiring step may perform a process of transmitting a sensing signal to the corresponding range gate on which the trigger signal is received and receiving a reflected signal N times to acquire a total of N range gate signals for the triggered range gate have.

The method may further include generating a final determination signal for determining whether an event is generated in the sensing area by summing the predetermined number of the range gate signals after the acquiring step.

The generating of the final determination signal may generate the final determination signal by summing up the predetermined number of the range gate signals.

In addition, the final decision signal generating step may generate the final decision signal by summing some of the predetermined number of the range gate signals.

The method may further include comparing the final determination signal with a preset second threshold to determine whether an event has occurred.

The determining whether or not the event is generated may determine that an intrusion has occurred in the sensing area when the final determination signal is greater than or equal to the second threshold value.

The first threshold value and the second threshold value may be equal to each other.

A sensing device according to another aspect of the present invention is a sensing device that detects occurrence of an event on a sensing area based on a range gate signal and sequentially scans a plurality of range gates for receiving a signal of a sensing area on a predetermined time basis A receiver for receiving a range gate signal in a section corresponding to each of the range gates; And if the received range gate signal is greater than or equal to a preset first threshold value, determine that the corresponding range gate signal is a trigger signal and acquire a predetermined number of range gate signals for the corresponding range gate from which the trigger signal is received And a signal processing unit.

Wherein the signal processor is configured to determine that the range gate signal is a trigger signal when the received range gate signal is greater than or equal to a preset first threshold value; And a summation processing unit for performing a process of transmitting a detection signal to the corresponding range gate on which the trigger signal is received and receiving a signal to be reflected N times to obtain a total of N range gate signals for the triggered range gate .

The summation processing unit may generate a final determination signal for determining whether an event is generated for the sensing area by summing the predetermined number of the range gate signals.

The signal processing unit may further include an event occurrence determination unit for comparing the final determination signal with a preset second threshold to determine whether an event has occurred.

The event occurrence determination unit may determine that an intrusion has occurred in the detection area when the final determination signal is equal to or greater than the second threshold value and the signal processing unit may further include an alarm unit that generates an alarm when the intrusion occurs have.

According to an embodiment of the present invention, when a signal is received and processed based on a range gate, a plurality of signals can be acquired and processed only for the range gate in which the trigger signal is generated. It is possible to further improve the event detection probability by detecting whether or not an event such as an intrusion into the detection area is generated based on the acquired signal.

1 is a diagram illustrating a concept of a range gate based signal processing.
2 is a conceptual diagram illustrating range gate signal processing according to an embodiment of the present invention.
3 is a diagram illustrating a detection probability according to the range gate signal processing and a detection probability when the conventional signal processing method is applied according to the embodiment of the present invention.
4 is a flowchart of a method of processing a range gate signal according to an embodiment of the present invention.
5 is a diagram illustrating the structure of a sensing apparatus according to an embodiment of the present invention.
6 is a diagram illustrating a structure of a signal processing unit according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention.

In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

Incidentally, throughout the specification, "comprising" means that other elements may be included, rather than excluding other elements, unless specifically stated otherwise.

Hereinafter, a method of processing a ragne-gate signal according to an embodiment of the present invention and a sensing apparatus using the same will be described with reference to the drawings.

1 is a diagram illustrating a concept of a range gate based signal processing.

The range gate based signal processing is to receive and process a signal based on the specific observation time of the radio wave. 1, a range gate indicates a point at which a signal of a specific scanning space can be received in a space in which a beam pattern of a predetermined shape is formed through an antenna and in which signals can be transmitted and received. Based on such a range gate, a signal reflected in the space is received and processed at a specific time when the range gate pulse signal is turned on.

For example, when a space in which a signal can be transmitted and received, that is, a time when the entire scanning period is 10 m and a range gate pulse is turned on, that is, a range gate is implemented at intervals of 0.2 m, Signal, and a total of 50 range gate pulse signals are used. In this case, as shown in FIG. 1, when a plurality of range gates are set, a signal reflected in the scanning space for the p-th range gate is received and processed at the time when the pulse signal for the p-th range gate is turned on. The range gate by distance resolution is - can be represented by the "range gate by distance resolution ^{(m) = 3 × 10 8} /2 × frequency band [Hz])".

Signals received at each range gate have different characteristics because they only receive signals in a space corresponding to each range gate. Therefore, when signal processing is performed on the receiving side, individual signal processing is performed for each of the range gates.

2 is a conceptual diagram illustrating range gate signal processing according to an embodiment of the present invention.

FIG. 2 (a) illustrates a conventional signal processing method, and FIG. 2 (b) illustrates signal processing according to an embodiment of the present invention.

Generally, as shown in FIG. 2 (a), signal processing is sequentially performed for each range gate in accordance with a scanning sequence, and signal processing is repeatedly performed from the beginning to the end of the range gate at a time corresponding to the next time. An apparatus for detecting intrusion based on such a range gate analyzes the signal characteristics of each range gate to determine whether or not to intrude.

In the embodiment of the present invention, as shown in (b) of FIG. 2, when analyzing signals of each range-gate, a trigger signal is applied to a signal of a range gate corresponding to a portion where an intrusion can be predicted Intensive processing. That is, when a signal of an arbitrary range gate is determined as a trigger signal as shown in (b) of FIG. 2, only the signal of the corresponding range-gate is processed continuously. Based on these results, the sensing device can determine whether or not to invade.

In the embodiment of the present invention, signal processing for a predetermined range-gate is selectively performed on the basis of intrusion trigger information without sequentially processing all range-gates. This range gate signal processing can be applied to an apparatus for detecting whether or not an intruder is intruding. The sensing device is an apparatus for detecting whether an intrusion occurs in a sensing area. The sensing device operates as an UWB (Ultra-wideband) sensor for transmitting and receiving an UWB signal.

1, a sensing device according to an embodiment of the present invention sets a total of P range gates in a space where signals can be transmitted and received by an antenna, that is, a sensing area, and a signal reflected on a corresponding space for each range gate It is assumed that it is received and processed.

The sensing device generates and outputs a sensing signal to the sensing area according to the range gates and receives the sensing signal reflected in the corresponding space for each range gate. A signal received in a specific time interval according to a pulse signal generated in response to the range gate is referred to as a " range gate signal "

The range gate signal can be expressed by the following equation (1).

Here, p denotes an index for the range gate (p < = Q), and k denotes a sample time index. H ₀ represents a hypothesis for no invasion, and H ₁ represents a hypothesis for an invasion.

는 p번째 레인지 게이트를 위한 펄스 신호가 온 되는 구간에서 수신된 신호 즉, 시간 k에서 p번째 레인지 게이트 신호를 나타낸다. 따라서,

는 침입이 없는 상태에서 수신되는 레인지 게이트 신호를 나타내며,

는 침입이 있는 상태에서 수신되는 레인지 게이트 신호를 나타낸다. α(>0)는 침입이 있는 상태에서의 채널 특성을 나타내는 채널값이다. 이러한 채널값은 수신부에서의 턴온 전압값(turn-on voltage)(펄스 신호를 온 시키는 턴온 전압값)과 유사하다.

는 노이즈를 나타내며, 백색 가우시안 분포(white Gaussian distribution)을 따른다.

의 분포는

로 나타낼 수 있다.

Represents a received signal in a period in which a pulse signal for the p-th range gate is turned on, that is, a p-th range gate signal at time k. therefore,

Represents a range gate signal received in the absence of intrusion,

Represents a range gate signal received in the presence of an intrusion. α (> 0) is a channel value indicating the channel characteristics in the presence of intrusion. This channel value is similar to the turn-on voltage (the turn-on voltage value for turning on the pulse signal) at the receiver.

Represents the noise and follows the white Gaussian distribution.

The distribution of

.

In general signal processing, the false alarm probability P _fa and the detection probability P _d for each range gate can be expressed as follows.

이며,

이다. here,

Lt;

to be.

는 미리 설정된 임계값으로, 침입 발생 여부를 판단하기 위한 임계값이다. P _fa represents the probability of error occurring when P range gates are used,

Is a predetermined threshold value, and is a threshold value for determining whether an intrusion has occurred or not.

In the case of the selective range gate signal processing based on the trigger signal according to the embodiment of the present invention, the error probability P _fa and detection probability P _d for each range gate can be calculated as follows.

For this purpose, the error probability and the detection probability are calculated using a signal obtained by successively adding N arbitrary range-gate signals in the trigger signal. A signal obtained by continuously adding N arbitrary range-gate signals can be expressed as follows.

는 트리거 신호가 발생된 경우 임의 레인지 게이트 신호를 N개 합한 신호로서, N개의 시간 샘플 신호라고 명명할 수 있다. 여기서, 합해서 사용하는 신호의 개수 N는 Q의 값보다 작은 값을 사용한다. 그리고 침입 발생시 신호의 변화는 N보다 큰 범위에서 발생한다고 가정한다. 이러한 N개의 시간 샘플 신호를 위의 수학식 1을 토대로 다음과 같이 모델링 할 수 있다. here,

Is a signal obtained by adding N arbitrary range gate signals when a trigger signal is generated, and can be called N time sample signals. Here, the total number N of signals to be used is a value smaller than the value of Q. It is assumed that the change of the signal occurs when the intrusion occurs in a range larger than N. These N time sample signals can be modeled as follows based on Equation (1) above.

이며, 침입이 있는 경우 즉, H₁의 경우,

이다. If there is no intrusion, that is, in case of H ₀ ,

In case of intrusion, that is, in case of H ₁ ,

to be.

Based on this, the false probability P _fa and the detection probability P _d according to the embodiment of the present invention can be calculated as follows.

이다. here,

to be.

Comparing the error probability and the detection probability (Equation 2) with the general range gate signal processing and the error probability and detection probability (Equation 5) with respect to the selective range gate signal processing according to the embodiment of the present invention, It can be inferred that the detection probability becomes very high with respect to the same error probability at the time of the range gate signal processing according to the embodiment. That is, as in the embodiment of the present invention, when a signal is processed by adding N consecutive samples to a specific range-gate signal selectively based on the trigger signal, the signal-to-noise ratio (SNR) And the detection probability becomes very high with respect to the same probability of error.

3 is a diagram illustrating a detection probability according to the range gate signal processing and a detection probability when the conventional signal processing method is applied according to the embodiment of the present invention.

Here we show the results of a simulation in a range-gate based UWB system, where N = 3. In the case of the false probability P _fa = 10 ^-2 , the detection probabilities for the signal processing according to the embodiment of the present invention are compared with those of the conventional signal processing, and in particular, the detection probabilities (P _d ) for the SNR are compared.

As shown in Fig. 3, the detection probability  In the case of P _d = 0.8, it can be confirmed that the signal processing method according to the embodiment of the present invention can improve the performance by about 4.5 dB compared to the conventional signal processing method.

4 is a flowchart of a method of processing a range gate signal according to an embodiment of the present invention.

The sensing device sets a plurality of range gates for receiving signals of the sensing area at predetermined time intervals.

As shown in FIG. 1, a sensing signal is transmitted to the sensing area, which is a full scanning period, at predetermined intervals according to the range gate information by the sensing device. That is, a sensing signal corresponding to each range gate is radiated to the sensing area (S100).

이거나, 수학식 5에 따른

일 수 있다.The sensing device receives and processes (e.g., filters, integrates, and samples) the range gate signal, which is a signal received at a specific time according to the range gate pulse signal (S110). Then, the range gate signal is compared with a preset first threshold value (S120). Here, the first threshold value is calculated according to Equation 2

Or according to equation (5)

Lt; / RTI &gt;

When the range gate signal is smaller than the first threshold value, it is determined that the trigger signal is not generated. The range gates are scanned until the trigger signal is generated, that is, until the range gate signal larger than the first threshold value is detected. (S130 and S140). This process (S100 to S150) can be repeatedly performed from the first range gate to the last range gate.

If the range gate signal is greater than the first threshold value, it is determined that a trigger signal due to the intrusion has occurred (S150). Then, a final decision signal is calculated by adding N sequences to the triggered range gate (S160). That is, a process of transmitting a detection signal to a corresponding range gate in which a range gate signal larger than the first threshold value is generated (hereinafter referred to as a range gate triggered for convenience of explanation) and receiving a reflected signal is referred to as N To obtain a total of N range gate signals for the triggered range gate, and summing them to generate a final decision signal. Here, it is also possible to generate a final decision signal by sampling a total of N range gate signals and adding them together.

Then, the final judgment signal is compared with a preset second threshold value to judge whether an intrusion finally occurs (S170). Where the second threshold may be. The first threshold value and the second threshold value may be the same according to the embodiment of the present invention.

Thereafter, when the final determination signal is larger than the second threshold value, the sensing device determines that the intrusion finally occurred. If it is determined that an intrusion has occurred, an alarm is generated (S180).

5 is a diagram illustrating the structure of a sensing apparatus according to an embodiment of the present invention.

As shown in FIG. 5, the sensing apparatus 1 according to the embodiment of the present invention includes a transmitter 10 for generating and transmitting a sensing signal, a range gate selector 20 for selecting a range gate, A reception unit 30 for receiving and processing a reflected signal, and a signal processing unit 40 for determining whether an event is generated based on the received signal.

The transmission unit 10 includes a signal generation unit 11, a transmission power allocation unit 12, a transmission signal output unit 13, and a transmission antenna 14.

The transmitting unit 10 generates a sensing signal and emits the sensed signal to the sensing region. Based on the information on the range gates set in the sensing apparatus 1 according to the embodiment of the present invention, Emitting region.

To this end, the signal generator 11 generates a detection signal. Here, the detection signal may be an Ultra-wideband (UWB) signal.

The transmission power allocation unit 12 allocates transmission power to the detection signal.

The transmission signal output unit 13 adds the transmission power allocated by the transmission power allocation unit 12 to the detection signal output from the signal generation unit 11 and outputs the resultant signal. The transmitting antenna 14 emits this sensing signal to the sensing area.

The transmitter 10 is not limited to the structure described above.

Meanwhile, the range gate selector 20 selects one range gate among the plurality of range gates set in the sensing apparatus 1 according to the embodiment of the present invention. 5, the range gate selector 20 includes a range gate pulse generator 21 and a first signal synthesizer 22.

The range gate pulse generator 21 generates a pulse signal that operates (for example, turns on) at a time corresponding to the range gate to be selected in order to select one of the plurality of range gates. For example, the pulse signal may have a value of 0 or 1, which may be 1 during the time interval of the selected range gate.

The first signal combining unit 22 multiplies the pulse signal output from the range gate pulse generator 21 and the signal output from the transmission signal output unit 13 of the transmitter 10 and outputs the multiplied signal.

The receiving unit 30 receives a signal incident on the sensing area, and particularly receives a signal output from the transmitting unit 10 to the sensing area and reflected in a specific space of the sensing area, that is, a range gate signal.

The receiving unit 30 may include a receiving antenna 31, a second signal combining unit 32, a filter unit 33, a signal integrating unit 34, and a sampling unit 35.

The signal received by the receiving antenna 31 is input to the second signal combining unit 32. The second signal combining unit 32 multiplies the signal output from the range gate selector 20 by the received signal Output. Accordingly, only a signal received in a time interval in which a signal reflected from a space corresponding to a selected gate range, that is, a pulse signal corresponding to the selected range gate, is turned on, can be extracted from the signals received through the reception antenna 31.

The filter unit 33 filters (for example, low pass filter) the signal output from the second signal combining unit 32 to extract only a signal of a desired band and outputs the extracted signal.

The signal integrating unit 34 integrates and outputs the filtered signal and the sampling unit 35 samples the signal output from the signal integrating unit 34 and outputs the sampled signal to the signal processing unit 40.

The receiving unit 30 is not limited to the structure described above, and receives and processes the range gate signal and transmits the signal to the signal processing unit 40.

The signal processing unit 40 processes the input signal to determine whether an event has occurred in the sensing area. Here, the event may vary depending on the purpose to be detected, and may be, for example, an occurrence of an intrusion. Then, the alarm processing can be performed based on the determination result.

For this purpose, the signal processing unit 40 may have a structure as shown in FIG.

6 is a diagram illustrating a structure of a signal processing unit according to an embodiment of the present invention.

The signal processing unit 40 according to the embodiment of the present invention includes a trigger generation determination unit 41, a summation processing unit 42 and an event generation determination unit 43 as shown in FIG. .

The trigger generation determination unit 41 compares the range gate signal transmitted from the reception unit 30 with a preset first threshold value to determine whether a trigger signal is generated. When the range gate signal is greater than or equal to the first threshold value, it is determined that a trigger signal indicating the possibility of intrusion is generated.

When the trigger signal is generated, the summation processing unit 42 receives N times of the signal for the range gate corresponding to the trigger signal, acquires and adds N range gate signals for the corresponding range gate, Lt; / RTI &gt;

The event occurrence determination unit 43 compares the final determination signal with a preset second threshold to determine whether an event has occurred. If the final determination signal is equal to or greater than the second threshold value, it is determined that an event, that is, an intrusion finally occurs.

The alarm unit 44 outputs an alarm when the event occurrence determination unit 43 determines that the intrusion eventually occurs.

Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. Readable recording medium. The present invention can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (13)

In a method for processing a range gate signal,
Sequentially scanning a plurality of range gates for receiving a signal of a sensing area in a predetermined time unit and receiving a range gate signal in a section corresponding to each range gate;
Determining that the range gate signal is a trigger signal when the range gate signal received at an arbitrary rate of gait is greater than or equal to a preset first threshold value;
Performing a process of transmitting a detection signal and receiving a reflected signal only for a corresponding range gate on which the trigger signal is received N times and calculating a total N of the range gates from which the trigger signal is received among the plurality of range gates Obtaining a plurality of range gate signals;
Generating a final decision signal based on a total of N range gate signals obtained for the range gate from which the trigger signal is received;
Determining whether an intrusion of the sensing area occurs based on the final determination signal
Wherein the range gate signal processing method comprises the steps of: delete The method of claim 1, wherein
Wherein the generating the final decision signal comprises:
Generating a final determination signal for determining whether an intrusion has occurred in the sensing area by summing up a predetermined number of range gate signals among the total N range gate signals
&Lt; / RTI &gt; The method of claim 1, wherein
Wherein the generating the final decision signal comprises:
Generating a final determination signal for determining whether an intrusion has occurred in the sensing area by summing all the N range gate signals;
Wherein the range gate signal processing method comprises the steps of: delete The method of claim 1, wherein
The method of claim 1,
And comparing the final determination signal with a preset second threshold value to determine that an intrusion has occurred in the sensing area when the final determination signal is greater than or equal to the second threshold value. delete The method of claim 6, wherein
Wherein the first threshold value and the second threshold value are equal to each other. In a sensing device that detects occurrence of an event for a sensing area based on a range gate signal,
A receiver for sequentially scanning a plurality of range gates for receiving a signal of a sensing area on a predetermined time basis and receiving a range gate signal in a section corresponding to each range gate; And
A signal processing unit for processing the range gate signal
Lt; / RTI &gt;
The signal processing unit
A trigger generation determining unit that determines that the corresponding range gate signal is a trigger signal when the range gate signal received from the arbitrary range gate is equal to or greater than a preset first threshold value; And
A process for transmitting a detection signal to the corresponding range gate where the trigger signal is received and receiving a signal to be reflected is performed N times, and a total N pieces of the plurality of range gates for the range gate from which the trigger signal is received And generates a final determination signal based on the total of the N range gate signals,
. delete The method of claim 9, wherein
The summing processor
Generates a final determination signal for determining whether an event is generated for the sensing area by summing a predetermined number of the range gate signals among the N total number of range gate signals acquired for the range gate from which the trigger signal is received , Sensing device. The method of claim 11, wherein
The signal processing unit
An event occurrence determination unit for comparing the final determination signal with a preset second threshold value to determine whether an event has occurred,
Further comprising: The method of claim 12, wherein
Wherein the event occurrence determination unit determines that an intrusion has occurred in the sensing area when the final determination signal is greater than or equal to the second threshold value,
The signal processing unit
And an alarm unit for generating an alarm when the intrusion occurs.

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