Wireless sensor, wireless sensor network and interaction method thereof

Abstract

The present invention provides a wireless sensor, a wireless sensor network and an interaction method thereof. The wireless sensor comprises a receiver, a transmitter, a first antenna, a first switch module, a counting control module and a state control module, which controls the receiving and transmitting switch by counting, and the transmitter and the receiver of the wireless sensor can both work temporarily, thereby reducing power consumption; and the wireless sensor transmits and receives and transmits using one antenna, thereby reducing the size of the node, and the wireless sensor node designed in this way consumes little energy, thereby meeting the low power consumption and miniaturization requirements of the node.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a wireless sensor, a wireless sensor network and an interaction method thereof. Background Art

[0002] With the development of the Internet of Things and intelligent unmanned platforms, the demand for wireless sensor nodes is increasing. In the existing technology, wireless sensors are often powered by batteries or external energy. However, since wireless sensor nodes are not always in the transmitting state during the actual working process, the existing power supply method is not conducive to the effective use of energy and cannot meet the needs of efficient use of equipment resources in the future.

[0003] Therefore, how to achieve low power consumption of wireless sensor nodes to effectively utilize energy is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a wireless sensor, a wireless sensor network and an interaction method thereof, which realize low power consumption of wireless sensor nodes.

[0005] A first aspect of the present invention provides a wireless sensor, a receiver, a transmitter, a first antenna, a first switch module, a counting control module and a state control module; wherein the first switch module is used to control the conduction or disconnection between the receiver and the first antenna to control whether the receiver sends to the first antenna; the first switch module is also used to control the conduction or disconnection between the transmitter and the first antenna to control whether the transmitter sends to the first antenna;

[0006] The first output port and the second output port of the counting control module are both connected to the first switch module. When the first output port of the counting control module sends a low level signal and the second output port sends a low level signal, the first switch module controls the transmitter to be connected to the first antenna and the receiver to be disconnected from the first antenna; when the first output port of the counting control module sends a high level signal and the second output port sends a low level signal, the first switch module controls the transmitter to be disconnected from the first antenna and the receiver to be connected to the first antenna; when the second output port of the counting control module sends a high level signal, the first switch module controls the transmitter to be disconnected from the first antenna and the receiver to be disconnected from the first antenna;

[0007] The first output port of the counting control module is also connected to the first input port of the state control module, and the first output port is also connected to a first OR gate through an inverter, the second output port is also connected to the first OR gate, and the output port of the first OR gate is connected to the control port of the receiver; the second output port is also connected to a second OR gate, the output port of the state control module is also connected to the second OR gate, and the output port of the second OR gate is connected to the control port of the transmitter; the second input port of the state control module is connected to the output port of the receiver;

[0008] In the case that the first output port and the second output port of the counting control module send low-level signals at the same time, and the receiver receives a power-off and non-operating control signal sent by the convergence node, the output port of the state control module is controlled to output a high level to control the transmitter to power off and not operate; in the case that the first output port and the second output port of the counting control module send low-level signals at the same time, and the receiver receives a normal working control signal sent by the convergence node, the output port of the state control module is controlled to output a low level to control the transmitter to operate normally; in the case that the first output port and the second output port of the counting control module send low-level signals at the same time, the control port input of the receiver is a high level to control the receiver to power off and not operate;

[0009] When the first output port of the counting control module sends a high level signal and the second output port sends a low level signal, the output port of the state control module is controlled to output a high level, so as to control the transmitter to be powered off and not work; and when the first output port of the counting control module sends a high level signal and the second output port sends a low level signal, the control port input of the receiver is a low level, so as to control the receiver to work normally;

[0010] When the second output port of the counting control module sends a high level signal, the control port inputs of the receiver and the transmitter are both high level, so as to control the receiver and the transmitter to be powered off and not work.

[0011] Optionally, the receiver is specifically used for:

[0012] When the power-off non-operating control signal is received, the power-off non-operating control signal is converted from frequency to amplitude to obtain a corresponding first amplitude and output it from the output port of the receiver; accordingly, the state control module is specifically used to control the output port of the state control module to output the first control signal when it is determined that the first amplitude is greater than a preset reference amplitude;

[0013] When the normal working control signal is received, the normal working control signal is frequency-amplitude converted to obtain a corresponding second amplitude and output it from the output port of the receiver; accordingly, the state control module is specifically used to control the output port of the state control module to output the second control signal when it is determined that the second amplitude is less than a preset reference amplitude.

[0014] Optionally, a transmission spectrum of the wireless sensor is outside a frequency band where a reception spectrum is located.

[0015] Optionally, the power-off non-operating control signal is a sine wave with a frequency of f0, and the normal operating control signal is a sine wave with a frequency of f1, and f0 deviates from f1.

[0016] Optionally, two parameters N1, N2 and N3 are set in the counting control module, and N3>N2>N1. The counting control module is specifically used for:

[0017] When the count is from 1 to N1, the first output port of the counting control module sends a low level signal, and the second output port sends a low level signal;

[0018] When the count is from 1+N1 to N2, the first output port of the counting control module sends a high level signal, and the second output port sends a low level signal;

[0019] When counting from 1+N2 to N3, the second output port of the counting control module sends a high level signal.

[0020] Optionally, the first switch module includes a first end, a second end, a third end, a fourth end and a fifth end;

[0021] Among them, the first end is connected to the transmission port of the transmitter, the second end is connected to the input port of the receiver, the third end is connected to the first antenna, the fourth end is connected to the first output port of the counting control module, and the fifth end is connected to the second output port of the counting control module.

[0022] A second aspect of the present invention provides a wireless sensor network, comprising a plurality of wireless sensors as described in the first aspect, and a sink node, wherein the plurality of wireless sensors are wirelessly connected to the sink node;

[0023] The aggregation node comprises:

[0024] A transceiver, wherein the transceiver is in a normal working state;

[0025] a transmitting antenna and a receiving antenna, wherein the transmitting antenna and the receiving antenna are respectively connected to the transceiver; and further comprising:

[0026] The filter is arranged between the receiving antenna and the transceiver.

[0027] A third aspect of the present invention provides an interaction method based on the wireless sensor network provided in the second aspect, the method comprising:

[0028] When the count increases from 1 to N1, the first output port of the counting control module sends a low level signal, and the second output port sends a low level signal, and the aggregation node sends the power-off non-operating control signal or the normal operating control signal to the wireless sensor to control the transmitter of the wireless sensor.

[0029] Optionally, the counting control module restarts counting from 0 after counting to N3.

[0030] The wireless sensor, wireless sensor network and interaction method thereof provided by the present invention control the transmitting and receiving switch by a counting method, so that the transmitter and the receiver of the wireless sensor can work briefly, thereby reducing power consumption; and the wireless sensor transmits and receives and uses a common antenna, thereby reducing the size of the node. The wireless sensor node designed in this way consumes little energy, thus meeting the low power consumption and miniaturization requirements of the node. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of a wireless sensor provided by an embodiment of the present invention.

[0033] Figure 2 A schematic diagram of frequency band division of a wireless sensor network provided by an embodiment of the present invention.

[0034] Figure 3 This is one of the principle diagrams of the frequency amplitude converter provided in an embodiment of the present invention.

[0035] Figure 4 A schematic diagram of a frequency-to-amplitude conversion curve provided by an embodiment of the present invention.

[0036] Figure 5 The second schematic diagram of the frequency amplitude converter provided in the embodiment of the present invention.

[0037] Figure 6 A schematic diagram of the state control module structure provided in an embodiment of the present invention.

[0038] Figure 7 A schematic structural diagram of a first switch module provided in an embodiment of the present invention.

[0039] Figure 8 A schematic diagram of the wireless sensor network structure provided by an embodiment of the present invention.

[0040] Fig. 9 A schematic diagram of a mode timing sequence provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The power supply of the wireless sensor comes from self-power supply, so it has very stringent low power consumption requirements. The constant operation of the receiver undoubtedly causes an increase in power consumption. In order to further reduce the power consumption of the wireless sensor, the embodiment of the present invention provides a wireless sensor and a wireless sensor network. The receiving and transmitting switch is controlled by a counting method. The transmitter and receiver of the wireless sensor can both work briefly, which reduces power consumption; and the wireless sensor uses a common antenna for transmission and reception, which reduces the size of the node. The wireless sensor node designed in this way consumes little energy and meets the low power consumption and miniaturization requirements of the node.

[0043] Figure 1 is a schematic diagram of the structure of a wireless sensor provided by an embodiment of the present invention, such as Figure 1 As shown, the wireless sensor includes: a receiver such as a frequency amplitude converter 11 as shown in the figure, a transmitter such as a voltage controlled oscillator VCO12 as shown in the figure, a first antenna 13, a first switch module 14, a counting control module 15 and a state control module 16.

[0044] like Figure 1 As shown, the wireless sensor provided by the embodiment of the present invention may also include a thermoelectric generator TEG, an energy management circuit, an energy storage and a temperature sensor, etc. The energy management circuit collects energy from the TEG. The wireless sensor converts the temperature into a frequency and sends it out, and the frequency amplitude converter 11 converts the command state of the aggregation node into an amplitude to control the sensor node.

[0045] Among them, the first switch module 14 is used to control the conduction or disconnection between the frequency amplitude converter 11 and the first antenna 13, so as to control whether the frequency amplitude converter 11 is sent to the first antenna 13; the first switch module 14 is also used to control the conduction or disconnection between the VCO 12 and the first antenna 13, so as to control whether the VCO 12 is sent to the first antenna 13. That is to say, in the wireless sensor provided by the embodiment of the present invention, the frequency amplitude converter 11 and the VCO 12 are not in the conduction state at the same time as the first antenna 13, and are respectively controlled by the first switch module 14, that is, the first switch module 14 can control the conduction or disconnection between the frequency amplitude converter 11 and the first antenna 13, and can also control the conduction or disconnection between the VCO 12 and the first antenna 13. This means that the frequency amplitude converter 11 and the VCO 12 are both in a non-working state for a period of time, thereby reducing energy consumption.

[0046] Table 1 shows three controlled states of the frequency-amplitude converter 11 and the VCO 12 in the embodiment of the present invention.

[0047] Table 1

[0048]

[0049] For example Figure 1 As shown, the first output port o1 and the second output port o2 of the counting control module 15 are both connected to the first switch module 14. When the first output port o1 of the counting control module 15 sends a low level signal (i.e., o1=0) and the second output port o2 sends a low level signal (i.e., o2=0), the first switch module 14 controls the VCO 12 to be connected to the first antenna 13, and the frequency-amplitude converter 11 to be disconnected from the first antenna 13. When the first output port o1 of the counting control module 15 sends a high level signal (i.e., o1=1) and the second output port o2 sends a low level signal (i.e., o2=0), the first switch module 14 controls the VCO 12 to be disconnected from the first antenna 13, and the frequency-amplitude converter 11 to be connected to the first antenna 13; when the second output port o2 sends a high level signal (i.e., o2=1), the first switch module 14 controls the VCO 12 to be disconnected from the first antenna 13, and the frequency-amplitude converter 11 to be disconnected from the first antenna 13.

[0050] Furthermore, if Figure 1As shown, the first output port o1 of the counting control module 15 is also connected to the first input port C0 of the state control module 16, and the first output port o1 is also connected to the first OR gate (i.e., OR 1) through an inverter, the second output port o2 is also connected to the first OR gate, and the output port of the first OR gate is connected to the control port pd of the frequency-amplitude converter 11; the second output port o2 is also connected to the second OR gate (i.e., OR 2), the output port cn of the state control module 16 is also connected to the second OR gate, and the output port of the second OR gate is connected to the control port pd of the transmitter; the second input port in of the state control module 16 is connected to the output port o of the frequency-amplitude converter 11.

[0051] When the first output port o1 and the second output port o2 of the counting control module 15 send low-level signals at the same time, and the frequency-amplitude converter 11 receives a power-off and non-operating control signal (e.g., FM2) sent by the aggregation node, the output port cn of the control state control module 16 outputs a high level to control the VCO 12 to be powered off and not to operate; when the first output port o1 and the second output port o2 of the counting control module 15 send low-level signals at the same time, and the frequency-amplitude converter 11 receives a normal operating control signal (e.g., FM1) sent by the aggregation node, the output port cn of the control state control module 16 outputs a low level to control the VCO 12 to operate normally; when the first output port o1 and the second output port o2 of the counting control module 15 send low-level signals at the same time, the control port pd of the frequency-amplitude converter 11 inputs a high level to control the frequency-amplitude converter 11 to be powered off and not to operate.

[0052] When the first output port o1 of the counting control module 15 sends a high level signal and the second output port o2 sends a low level signal, the output port cn of the control state control module 16 outputs a high level to control the VCO12 to power off and not work; and when the first output port o1 of the counting control module 15 sends a high level signal and the second output port o2 sends a low level signal, the control port pd input of the frequency-amplitude converter 11 is a low level to control the frequency-amplitude converter 11 to work normally.

[0053] When the second output port o2 of the counting control module 15 sends a high level signal, the control port pd inputs of the frequency amplitude converter 11 and the VCO 12 are both high level, so as to control the frequency amplitude converter 11 and the VCO 12 to be powered off and not work.

[0054] In this embodiment, two parameters N1, N2 and N3 are set in the counting control module, and N3>N2>N1. The counting control module 15 is specifically used for:

[0055] When counting from 1 to N1, the first output port o1 of the counting control module 15 sends a low level signal (ie, o1=0), and the second output port o2 sends a low level signal (ie, o2=0);

[0056] When counting from 1+N1 to N2, the first output port o1 of the counting control module 15 sends a high level signal (ie, o1=1), and the second output port o2 sends a low level signal (ie, o2=0);

[0057] When the count is from 1+N2 to N3, the second output port o2 of the counting control module 15 sends a high level signal (ie, o2=1).

[0058] The wireless sensor provided by the present invention controls the transmitting and receiving switch by counting method, and the transmitter and receiver of the wireless sensor can both work briefly, thereby reducing power consumption; and the wireless sensor transmits and receives and uses a common antenna, thereby reducing the size of the node. The wireless sensor node designed in this way consumes little energy, thereby meeting the low power consumption and miniaturization requirements of the node.

[0059] On the basis of the above embodiment, the frequency-amplitude converter 11 is specifically used for: when receiving the power-off non-operating control signal (e.g., FM2), performing frequency-amplitude conversion on the power-off non-operating control signal (e.g., FM2), obtaining the corresponding first amplitude and outputting it from the output port o of the frequency-amplitude converter 11; accordingly, the state control module 16 is specifically used for controlling the output port cn of the state control module 16 to output the first control signal (e.g., outputting a high level through cn) when determining that the first amplitude is greater than a preset reference amplitude;

[0060] When a normal working control signal (e.g., FM1) is received, a frequency-amplitude conversion is performed on the normal working control signal (e.g., FM2) to obtain a corresponding second amplitude and output it from the output port o of the frequency-amplitude converter 11; accordingly, the state control module 16 is specifically used to control the output port cn of the state control module 16 to output a second control signal (e.g., output a low level through cn) when it is determined that the second amplitude is less than a preset reference amplitude.

[0061] Figure 2 A schematic diagram of frequency band division of a wireless sensor network provided in an embodiment of the present invention is shown in FIG. Figure 2As shown in the figure, the frequency band division of the wireless sensor network includes the transmitting band RX_Fi (i=1,…,m) and receiving band TX_Fi (i=1,…,m) of m sensor nodes. It can be seen that there is a certain frequency interval between the receiving band RX_Fi (i=1,…,m) of the aggregation node and the transmitting band TX_Fi (i=1,…,m) to reduce interference. The transmission spectrum of the same wireless sensor node is outside the frequency band where the receiving spectrum is located, that is, the impact of transmission on reception is negligible. Since the aggregation node is always receiving and transmitting, in order to prevent the transmission signal from affecting the reception, a filter can be added behind the receiving antenna of the aggregation node, so that the transmission signal TX_Fi (i=1,…,m) of the aggregation node is outside the filter band of the receiving end and is filtered out. Since the transmission and reception of the wireless sensor do not work at the same time, there is no situation where its own transmission interferes with its own reception.

[0062] Figure 3 One of the principle diagrams of the frequency amplitude converter provided by the embodiment of the present invention, Figure 4 A frequency-to-amplitude conversion curve diagram provided by an embodiment of the present invention is shown in FIG. Figure 3 and Figure 4 As shown, the gate voltage is provided to the MOS tube M0 through the voltage division of resistors R1 and R2. C1 and C2 are the DC isolation capacitors for input and output respectively. The resonant frequency of the load inductor L0 and the load capacitor C0 is f0. The conversion curve between the FM wave frequency and the output amplitude is as follows: Figure 4 It can be seen that the curve is bandpass, and the output amplitude is the largest at f0. The larger the frequency difference with f0, the smaller the output amplitude.

[0063] Figure 5 The second schematic diagram of the frequency amplitude converter provided by the embodiment of the present invention is as follows: Figure 5 As shown, the transformer secondary coil is connected in parallel with capacitor C1, and the FM wave is input from the transformer primary coil. Due to the resonance between the secondary coil inductance and the capacitor, the conversion curve between the FM wave frequency and the AM wave output amplitude is obtained as shown in Figure 4 f0 is the resonant frequency of the secondary coil inductance and capacitance. It can be seen that the curve is bandpass, and the output amplitude of f0 is the largest. The larger the frequency difference with f0, the smaller the output amplitude.

[0064] Figure 6 A schematic diagram of the state control module structure provided by an embodiment of the present invention, such as Figure 6 As shown, the state control module 16 determines the amplitude of different FM frequency conversions through a comparator. Assume that n frequency modulation signals FM1, ..., FMn are supported, and the frequency-to-amplitude conversion is performed into n amplitude signals v1, ..., vn, satisfying the monotonic v1 < ... < vn. When there is no input signal in the receiving circuit, it is equivalent to the input signal frequency being 0 (dc), as shown in FIG. Figure 4It can be seen that dc is farther away from f0, so the output amplitude is smaller, set to vDC. v0 is the output amplitude corresponding to the resonant frequency f0. Then the relationship between the comparator level and the amplitude is set to vDC<vref1<v1<…<vrefn<vn≤v0; when c0 is high, the output<cn,…,c1> When c0 is low,<cn,…,c1> Determined by the ratio of in to vref1,…,vrefn.

[0065] Based on this, in the wireless sensor network provided by the embodiment of the present invention, the power-off non-operating control signal FM2 sent by the sink node may be a sine wave with a frequency of f0, and the normal operating control signal FM1 may be a sine wave with a frequency of f1, and f0 deviates from f1.

[0066] Figure 7 A schematic diagram of the structure of a first switch module provided in an embodiment of the present invention is shown in FIG. Figure 7 As shown, the first switch module 14 includes a first terminal 1, a second terminal 2, a third terminal 3, a fourth terminal 4 and a fifth terminal 5. The first terminal 1 is connected to the transmitting port o of the VCO 12, the second terminal 2 is connected to the input port in of the frequency amplitude converter 11, the third terminal 3 is connected to the first antenna 13, the fourth terminal 4 is connected to the first output port o1 of the counting control module 15, and the fifth terminal 5 is connected to the second output port o2 of the counting control module 15. Specifically, the first switch module is as follows Figure 7 As shown, M1, M3, M5, M7 and M9 are pmos, and M2, M4, M6, M8 and M10 are nmos. C2 is a DC blocking capacitor. When the fifth terminal 5 is high, the first terminal 1 / second terminal 2 is disconnected from the third terminal 3; when the fifth terminal 5 is low, when the fourth terminal 4 is high, the first terminal 1 is disconnected and the second terminal 2 is connected to the third terminal 3; when the fourth terminal 4 is low, the second terminal 2 is disconnected and the first terminal 1 is connected to the third terminal 3.

[0067] An embodiment of the present invention also provides a convergence node, including a transceiver, which is in a normal working state; a transmitting antenna and a receiving antenna, which are respectively connected to the transceiver; and a filter, which is arranged between the receiving antenna and the transceiver.

[0068] Figure 8 A schematic diagram of the wireless sensor network structure provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the sink node uses dual antennas for independent transmission and reception, and both transmission and reception work normally, so that the reception and transmission of the wireless sensor node can work intermittently. In this wireless sensor network, multiple wireless sensors are connected to the sink node by wireless communication, which satisfies the mutual communication between the sensor node and the sink node.

[0069] Since the wireless sensor provided in the embodiment adopts clock counting, in order to avoid the problem of receiving data loss caused by the different clocks of the aggregation node and the wireless sensor node, the aggregation node adopts dual antennas for independent transmission and independent reception. The transmitter and the receiver are always working, avoiding the clock synchronization problem. Since the aggregation node is always working for receiving and sending, in order to prevent the sending signal from affecting the receiving, such as Figure 8 Add a filter F1 behind the receiving antenna, the filter response curve is as follows Figure 4 The transmitting antenna and filter F1 are connected to the FM transmitter, the transmitter is connected to the digital processing, and the digital processing is connected to the host computer via wire.

[0070] The wireless sensor node receives the command FM signal sent by the sink node. Different frequencies represent different commands. After frequency to amplitude conversion, the converted amplitude in is compared and judged, and the control signal cn is output.

[0071] The following provides an interactive method of a wireless sensor network based on the above embodiment, combined with Figure 1 As shown, when the VCO pd signal is high, the VCO does not work when the power is off, and when the pd signal is low, the VCO works normally. When the frequency amplitude converter pd signal is high, the frequency amplitude converter does not work when the power is off, and when the pd signal is low, the frequency amplitude converter works normally. The counting control module has three parameters N1, N2 and N3 (N3>N2>N1).

[0072] 1. When the count goes from 1 to N1, the output o1 of the counting control module is low level, and o2 is low level, that is, the sending state:

[0073] 1) The state control module input c0 is equal to the count control module output o1, which is low. Figure 1 Known output<cn,…,c1> Determined by the ratio of in to vref1,…,vrefn.

[0074] The input of the frequency-amplitude converter of this embodiment has two control FM signals from the sink node, one of which is selected: FM1 and FM2. FM1 represents that the wireless sensor node continues to work normally, and FM2 represents that the wireless sensor node turns off transmission. Assume that FM2 is a sine wave with a frequency of f0, and FM1 is a sine wave with a frequency that deviates greatly from f0.

[0075] When the signal is FM 2, the output amplitude of the frequency-amplitude converter is v0, and the output of cn is 1. After calculation with o2 (low), the output is high, and the VCO is powered off and does not work; when the signal is FM 1, the output amplitude of the receiving circuit is less than vrefn, and the output of cn is 0. After calculation with o2 (low), the output is low, and the VCO works normally. It can be seen that the purpose of controlling the sensor node (for example, whether the VCO works or does not work after powering off) is achieved by converging the FM signals of the nodes (for example, FM1 and FM2).

[0076] 2) The fourth terminal 4 of the first switch module is equal to the output o1 of the counting control module, and the fifth terminal 5 is equal to the output o2 of the counting control module, both of which are low level. It can be known that the VCO is connected to the antenna and the frequency amplitude converter is disconnected from the antenna.

[0077] 3) The output o1 of the counting control module is inverted and calculated with o2 and input to the PD of the frequency-amplitude converter. o1 is low level, o2 is low level, and the calculated PD is high. Therefore, the frequency-amplitude converter does not work when the power is off, which saves power consumption.

[0078] 2. When the count goes from 1+N1 to N2, the output o1 of the counting control module is high level and o2 is low level, which is the receiving state:

[0079] 1) As can be seen from the figure, the switch disconnects the VCO from the antenna and connects the frequency-amplitude converter to the antenna;

[0080] 2) The output o1 of the counting control module is inverted and calculated with o2 and input to the PD of the frequency-amplitude converter. o1 is high level and o2 is low level. The calculated PD is low and the frequency-amplitude converter works.

[0081] 3) The state control module input c0 is high, the output<cn,…,c1> All are high, then cn output is 1, VCO is powered off and does not work, thus saving power consumption.

[0082] 3. When counting from 1+N2 to N3, o2 is at a high level, neither receiving nor sending.

[0083] 1) The switch disconnects the VCO from the antenna, and the frequency-to-amplitude converter also disconnects the antenna;

[0084] 2) o2 is at a high level, and after passing through either 1 or 2, the output is high. The VCO and the frequency-amplitude converter are both powered off and do not work, and the system power consumption is minimal.

[0085] 4. After counting to N3, restart counting from 0.

[0086] Fig. 9 A schematic diagram of a mode timing sequence provided by an embodiment of the present invention, such as Fig. 9The timing diagram of the three modes is shown. The modes are controlled by the output waveforms o1 and o2 of the counting control module, as shown in Table 2. The counter period is T0, so the sensor node sends T0 After N1 time, use T0 (N2-N1) time to receive. T0 N3 is the entire mode cycle.

[0087] Table 2

[0088]

[0089] The embodiment of the present invention realizes low power consumption through mode selection, and at the same time satisfies the control of the wireless sensor node, and only uses one antenna to meet the low power consumption and miniaturization requirements of the node.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless sensor, characterized in that: include: A receiver, a transmitter, a first antenna, a first switch module, a counting control module and a state control module; wherein the first switch module is used to control the conduction or disconnection between the receiver and the first antenna to control whether the receiver sends to the first antenna; the first switch module is also used to control the conduction or disconnection between the transmitter and the first antenna to control whether the transmitter sends to the first antenna; The first output port and the second output port of the counting control module are both connected to the first switch module. When the first output port of the counting control module sends a low level signal and the second output port sends a low level signal, the first switch module controls the transmitter to be connected to the first antenna and the receiver to be disconnected from the first antenna. When the first output port of the counting control module sends a high level signal and the second output port sends a low level signal, the first switch module controls the transmitter to be disconnected from the first antenna and the receiver to be connected to the first antenna. When the second output port sends a high level signal, the first switch module controls the transmitter to be disconnected from the first antenna, and the receiver to be disconnected from the first antenna; The first output port of the counting control module is also connected to the first input port of the state control module, and the first output port is also connected to a first OR gate through an inverter, the second output port is also connected to the first OR gate, and the output port of the first OR gate is connected to the control port of the receiver; the second output port is also connected to a second OR gate, the output port of the state control module is also connected to the second OR gate, and the output port of the second OR gate is connected to the control port of the transmitter; the second input port of the state control module is connected to the output port of the receiver; In the case that the first output port and the second output port of the counting control module send low-level signals at the same time, and the receiver receives a power-off and non-operating control signal sent by the convergence node, the output port of the state control module is controlled to output a high level to control the transmitter to power off and not operate; in the case that the first output port and the second output port of the counting control module send low-level signals at the same time, and the receiver receives a normal working control signal sent by the convergence node, the output port of the state control module is controlled to output a low level to control the transmitter to operate normally; in the case that the first output port and the second output port of the counting control module send low-level signals at the same time, the control port input of the receiver is a high level to control the receiver to power off and not operate; When the first output port of the counting control module sends a high level signal and the second output port sends a low level signal, the output port of the state control module is controlled to output a high level, so as to control the transmitter to be powered off and not work; and when the first output port of the counting control module sends a high level signal and the second output port sends a low level signal, the control port input of the receiver is a low level, so as to control the receiver to work normally; When the second output port of the counting control module sends a high level signal, the control port inputs of the receiver and the transmitter are both high level, so as to control the receiver and the transmitter to be powered off and not work.

2. The wireless sensor according to claim 1, characterized in that: The receiver is specifically used for: When the power-off non-operating control signal is received, the power-off non-operating control signal is converted from frequency to amplitude to obtain a corresponding first amplitude and output it from the output port of the receiver; accordingly, the state control module is specifically used to control the output port of the state control module to output the first control signal when it is determined that the first amplitude is greater than a preset reference amplitude; When the normal working control signal is received, the normal working control signal is frequency-amplitude converted to obtain a corresponding second amplitude and output it from the output port of the receiver; accordingly, the state control module is specifically used to control the output port of the state control module to output the second control signal when it is determined that the second amplitude is less than a preset reference amplitude.

3. The wireless sensor according to claim 1, characterized in that: The transmission spectrum of the wireless sensor is outside the frequency band where the receiving spectrum is located.

4. The wireless sensor according to claim 1, characterized in that: The power-off non-operating control signal is a sine wave with a frequency of f0, and the normal operating control signal is a sine wave with a frequency of f1, and f0 deviates from f1.

5. The wireless sensor according to any one of claims 1 to 4, characterized in that: The counting control module is provided with two parameters N1, N2 and N3, and N3>N2>N1. The counting control module is specifically used for: When the count is from 1 to N1, the first output port of the counting control module sends a low level signal, and the second output port sends a low level signal; When the count is from 1+N1 to N2, the first output port of the counting control module sends a high level signal, and the second output port sends a low level signal; When the count is from 1+N2 to N3, the second output port of the counting control module sends a high level signal.

6. The wireless sensor according to any one of claims 1 to 4, characterized in that: The first switch module includes a first end, a second end, a third end, a fourth end and a fifth end; Among them, the first end is connected to the transmission port of the transmitter, the second end is connected to the input port of the receiver, the third end is connected to the first antenna, the fourth end is connected to the first output port of the counting control module, and the fifth end is connected to the second output port of the counting control module.

7. A wireless sensor network, characterized in that: The method comprises a plurality of wireless sensors according to any one of claims 1 to 6, and a sink node, wherein the plurality of wireless sensors are wirelessly connected to the sink node; The aggregation node comprises: A transceiver, wherein the transceiver is in a normal working state; a transmitting antenna and a receiving antenna, wherein the transmitting antenna and the receiving antenna are respectively connected to the transceiver; and further comprising: The filter is arranged between the receiving antenna and the transceiver.

8. An interaction method based on the wireless sensor network as claimed in claim 7, characterized in that: The method comprises: When the count increases from 1 to N1, the first output port of the counting control module sends a low level signal, and the second output port sends a low level signal, and the aggregation node sends the power-off non-operating control signal or the normal operating control signal to the wireless sensor to control the transmitter of the wireless sensor.

9. The wireless sensor network interaction method according to claim 8, characterized in that: The counting control module counts to N3 and then restarts counting from 0.

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