Beidou antenna state detection system and method

Abstract

The invention discloses a Beidou antenna state detection system and method, and the method comprises the steps: arranging a feed circuit in a Beidou receiver, supplying power to a Beidou antenna through an antenna feeder, receiving a Beidou satellite signal through the Beidou antenna, and feeding back the Beidou satellite signal to the Beidou receiver through the antenna feeder; wherein a diode is connected in series in the feed circuit, a data processing unit is also arranged in the Beidou receiver, and a feed voltage V1 detected when the Beidou antenna is normally connected and a feed voltage V2 detected when the Beidou antenna is disconnected are preset in the data processing unit, and the feed voltage V1 and the feed voltage V2 serve as references. And comparing the current feed voltage value V actually obtained by the data processing unit with the two reference values, and judging whether the connection state and the working state of the antenna are normal or not.

Description

Technical Field

[0001] The present invention relates to Beidou antenna detection technology, and specifically to a system and method for detecting the connection status and output normality of a Beidou antenna. Background Art

[0002] The Beidou antenna is used to receive the air telegram signals broadcast by the Beidou satellite system, and convert them into electrical signals and input them into the Beidou receiver. The Beidou receiver performs frequency conversion, demodulation and outputs information such as time, coordinates, speed, and angle. Many application scenarios require obtaining information such as time, coordinates, speed, and angle of the current position. Therefore, the Beidou receiver system is widely used in daily life.

[0003] In order to better receive the telegram signals broadcast by the Beidou satellite system without obstruction, generally the Beidou antenna is placed in a position with an open view and no obstruction. Because the installation position of the Beidou antenna is relatively high, for easy maintenance, it is required that the Beidou receiver can actively detect and report the connection status and working status of the Beidou antenna. Usually, the detection method generally adopts the method of current monitoring, amplification and comparison, which requires selecting special current monitoring, amplification and comparison circuits, and at the same time requires a supporting power supply circuit. The scheme is relatively complex and reduces the reliability of the system. Summary of the Invention

[0004] To solve the above problems, the purpose of the present invention is to provide a Beidou antenna status detection system and method. Through the system set by the present invention, the detection circuit of the antenna connection status can be simplified, and no longer use complex current monitoring, amplification and comparison circuits and corresponding power supply circuits. Through the detection method provided by the present invention, it can reliably and stably detect whether the connection status between the antenna and the receiver host is normal, and whether the Beidou antenna signal output is normal.

[0005] The present invention provides a Beidou antenna status detection system, including a Beidou antenna, a Beidou receiver and an antenna feeder. It is characterized in that: a feeding circuit is provided in the Beidou receiver to supply power to the Beidou antenna through the antenna feeder. At the same time, the Beidou antenna receives Beidou satellite signals and feeds them back to the Beidou receiver through the antenna feeder; wherein, a diode is connected in series in the feeding circuit, and a data processing unit is also provided in the Beidou receiver.

[0006] Further, a plurality of diodes are connected in series in the feeding circuit, with the P end of the diode applying a positive voltage and the N end applying a negative voltage.

[0007] Further, the data processing unit contains an ADC functional component, and a Beidou antenna status judgment program is implanted in the data processing unit.

[0008] The present invention also provides a method for detecting the status of a Beidou antenna. Based on the above system, it includes two aspects: judging whether the connection status of the Beidou antenna is normal and whether the working status is normal;

[0009] Preset two reference values in the data processing unit:

[0010] When the Beidou antenna is normally connected, the feeding voltage V1 detected by the data processing unit;

[0011] When the Beidou antenna is disconnected, the feeding voltage V2 detected by the data processing unit;

[0012] Taking this as a reference, compare the current feeding voltage value V actually obtained by the data processing unit with these two reference values, and make the following judgments:

[0013] 1) If V < V1, it means the antenna is connected, but the antenna is damaged;

[0014] 2) If V = V1, it means the antenna connection is intact. At this time, the system further judges whether the antenna is working normally by the reception signal situation;

[0015] 3) If V1 < V < V2, it means the antenna is connected, but the antenna is damaged;

[0016] 4) If V = V2, it means the antenna is not connected.

[0017] Further, in 2), if V = V1, the system judges whether the satellite reception is normal through the positioning valid flag bit of the RMC statement output by the Beidou receiver, and sets two values A and W for the positioning valid flag bit of the RMC statement;

[0018] When the positioning valid flag bit of the RMC statement = A, it means the satellite reception is normal, indicating that the antenna is working normally;

[0019] When the positioning valid flag bit of the RMC statement = W, it means the satellite reception is abnormal, indicating that the antenna is blocked or the passive device is damaged.

[0020] Further, V1 and V2 are average values obtained by using multiple devices and performing multiple measurements and calculations.

[0021] The advantages of the present invention are simple and practical. Through the design of this antenna system, it can greatly get rid of the traditional detection method of the connection status of the Beidou antenna, simplify the circuit, and while reducing the cost, it can further improve the stability and reliability of the system during long-term operation.

[0022] During the simulation test and actual application of the present invention, it has been verified that the effect is good, effectively reducing the cost, while reducing the failure rate problem, and generating good economic benefits. The Beidou receiver system of the present invention can be applied to fields such as ocean fishing boats, hydrological data collection, and environmental monitoring. Description of the Drawings

[0023] Figure 1 is the block diagram of the Beidou receiving system;

[0024] Figure 2 is the Beidou antenna feeding circuit diagram provided by the present invention;

[0025] Figure 3 is the flow chart for judging the working state of the Beidou antenna provided by the present invention. Detailed implementation manners

[0026] The present invention will be described in detail below in conjunction with embodiments. Those skilled in the art should know that the following embodiments do not uniquely limit the technical solution of the present invention. Any equivalent transformation or modification made under the spirit of the technical solution of the present invention shall be regarded as belonging to the protection scope of the present invention.

[0027] Generally, when the Beidou receiving system is erected, the Beidou antenna is erected outdoors and the Beidou receiver is located indoors. The two are generally connected by an antenna feeder line of 30 meters to 50 meters. The system composition is as Figure 1 shown.

[0028] When the system works, the power supply voltage required for the operation of the Beidou antenna and the converted message signal are both transmitted through the same antenna feeder line. The Beidou receiver supplies power to the Beidou antenna through the antenna feeder line. The Beidou antenna receives the message signal broadcast by the Beidou satellite, filters and amplifies it, and then outputs it to the Beidou receiver through the antenna feeder line.

[0029] The Beidou antenna generally uses 5V power supply. After passing through the antenna feeder line, the 5V power supply is converted into various voltages inside the Beidou antenna for the operation of the Beidou antenna. The Beidou antenna can generally be divided into single-frequency, dual-frequency and multi-frequency antennas. According to the different configured frequency points of the Beidou antenna, its working current is slightly different. The working current of the Beidou antenna is generally about 100mA. The Beidou antenna with anti-interference function has a relatively large power consumption, generally about 10W.

[0030] Also, because the diode has the characteristic of forward voltage drop, that is, when a positive voltage is applied to the P end of the diode and a negative voltage is applied to the N end, the diode can conduct, and there is a certain voltage drop after the positive voltage passes through the diode. There is a certain relationship between this voltage drop and the conduction current of the diode; within a certain range, there is a certain linear relationship between the forward voltage drop and the conduction current of the diode, that is, when the conduction current passing through the diode increases, the forward voltage drop of the diode will also increase accordingly. When the current reaches the maximum conduction current of the diode, the forward conduction voltage drop of the diode also reaches the maximum value.

[0031] In view of the above analysis, the present invention makes full use of the characteristic that there is a voltage drop when a diode conducts forward to realize the judgment of the connection state of the Beidou antenna and the detection of the working state.

[0032] Therefore, the present invention provides a Beidou antenna state detection system, as Figure 1 , Figure 2 shown, which includes a Beidou antenna, a Beidou receiver and an antenna feeder. The Beidou antenna and the Beidou receiver are connected by the antenna feeder. The Beidou receiver provides power and supplies power to the Beidou antenna through the antenna feeder. At the same time, the Beidou antenna receives Beidou satellite signals, which are filtered, amplified and then fed back to the Beidou receiver through the antenna feeder. Therefore, a feeding circuit is provided in the Beidou receiver. In the present invention, a diode is connected in series in the feeding circuit, and the antenna feeding supplies power to the Beidou antenna after passing through the diode in the feeding circuit. In addition, a data processing unit is also provided in the Beidou receiver. The data processing unit contains an ADC functional component. After the Beidou satellite signals received by the Beidou antenna are fed back to the Beidou receiver through the antenna feeder, the ADC functional component of the data processing unit completes the detection, sampling and conversion of the voltage value, and then the data processing unit cooperates with an algorithm to complete the judgment of the Beidou antenna state.

[0033] In actual application, since the working current of the Beidou antenna is relatively small, generally about 100 mA, the voltage drop generated by the diode is relatively small, and the forward voltage drop is not obvious after the antenna feeding passes through one diode, resulting in a deviation in the detection accuracy of the data processing unit and prone to misjudgment. To improve the detection accuracy, the present invention solves this problem by using the method of connecting multiple diodes in series. The working current of the antenna continuously passes through multiple diodes, and each diode generates a corresponding voltage drop. Assuming that the voltage drop of a single diode is ΔV, the voltage drop generated after N diodes are connected in series is N*ΔV, that is, the voltage drop of a single diode is amplified by N times. Then the forward voltage drop is obvious after the antenna feeding passes through multiple diodes, increasing the detection accuracy of the data processing unit and improving the reliability of the Beidou antenna detection. Therefore, the present invention is also applicable to the judgment of the connection state and the detection of the working state of a Beidou antenna with a large power consumption and anti-interference function.

[0034] Through the above system, it is not only possible to detect whether the Beidou antenna is connected, but also to detect whether the antenna There is a fault.

[0035] Because, if the Beidou antenna is normally connected, there will be current passing through. After the antenna feeding passes through the diode, there will be a forward voltage drop. The voltage change after the antenna feeding passes through the diode is input to the data processing unit, and the ADC functional component of the data processing unit will detect a different voltage value;

[0036] If the Beidou antenna is disconnected, there will be no current passing through the diode, and there is almost no voltage drop in the antenna feeding. Then the ADC functional component of the data processing unit cannot detect the change in the voltage value;

[0037] If the connection of the Beidou antenna circuit is normal, but the antenna may malfunction (the feedback signal is abnormal), the feedback voltage value will also be different. Antenna failures generally manifest as component damage, which can be divided into active component damage and passive component damage. Active component damage generally causes a change in the antenna operating current, so an abnormal voltage value can be detected. Both passive component damage and active component damage can cause the antenna to fail to properly complete the conversion of the message signal. The data processing unit can comprehensively judge the change in the forward voltage drop of the diode and the satellite reception situation through software algorithms to determine whether there is a current antenna failure.

[0038] Therefore, let: when the Beidou antenna is normally connected, the ADC functional component of the data processing unit completes the voltage detection, sampling, and conversion of the antenna feeding voltage after passing through the diode, and obtains a corresponding voltage value V1;

[0039] When the Beidou antenna is not connected to the feeding circuit, the ADC functional component of the data processing unit completes the voltage detection, sampling, and conversion of the antenna feeding voltage without passing through the diode, and obtains a corresponding voltage value V2.

[0040] Taking these two values as the reference, after the system is set up and put into use, the data processing unit can compare the currently obtained antenna feeding voltage value V with the two reference values, and obtain the detection of the Beidou antenna connection status and working status by looking up the truth table, which is pre-calibrated through experiments.

[0041] Table 1 Truth Table of Beidou Antenna Status

[0042]

[0043]

[0044] As Figure 3 shown, the process of judging the above information is as follows:

[0045] 1) After the system is initialized, first, the data processing unit collects the voltage signal. If the collection is successful, it indicates that the system is set up normally. If the collection fails, it means that the antenna system has not been set up properly and cannot be put into use;

[0046] 2) After the data processing unit can collect the voltage signal V, read the two pre-stored reference values V1 and V2 in the system, and compare V with the two reference values V1 and V2;

[0047] 3) If V < V1, it means that the antenna is connected, but the antenna is damaged and there is a short circuit fault in the active component, and an alarm message is output;

[0048] 4) If V = V1, it indicates that the antenna is connected properly. At this time, the system further determines whether the positioning is normal by judging the positioning valid flag bit of the RMC statement output by the Beidou receiver, and sets two values A and W for the positioning valid flag bit of the RMC statement.

[0049] When the positioning valid flag bit of the RMC statement = A, it means that the satellite reception is normal, indicating that the antenna is working properly, can output signals normally, and the antenna receiver outputs reports normally.

[0050] When the positioning valid flag bit of the RMC statement = W, it means that the satellite reception is abnormal, indicating that the antenna is blocked or the passive device is damaged.

[0051] 5) If V1 < V < V2, it means that although the antenna is connected, the antenna is damaged and there is an open circuit fault in the active device, and an alarm message is output.

[0052] 6) If V = V2, it means that the antenna is not connected and is disconnected, and an alarm message is output.

[0053] Due to the slight differences in the component manufacturing process, there may be certain deviations in the parameters of the components themselves. Therefore, the reference values V1 and V2 should be obtained by using multiple devices and multiple measurements, and the average values obtained by multiple devices and multiple measurements should be used.

[0054] When selecting diodes, it is best to select diodes of the same brand and the same model to prevent large differences in the reference values V1 and V2 caused by mixing diodes of different brands and different models, which may easily lead to misjudgment.

[0055] It is recommended to select silicon diodes with a relatively large forward voltage drop for diodes, which can reduce the number of diodes, further reduce costs and improve system reliability.

[0056] The above descriptions are only for the specific embodiments of the present application to enable those skilled in the art to understand or implement the present application. However, various equivalent modifications and transformations of these embodiments will be obvious to those skilled in the art. Without departing from the spirit or scope of the present application, the present application will not be limited to these embodiments, but will conform to the scope consistent with the claims of the present application.

Claims

1. A Beidou antenna status detection system, comprising a Beidou antenna, a Beidou receiver and an antenna feeder, characterized in that: A power feeding circuit is provided in the Beidou receiver to supply power to the Beidou antenna through an antenna feeder. At the same time, the Beidou antenna receives Beidou satellite signals and feeds them back to the Beidou receiver through the antenna feeder. Among them, a diode is connected in series in the power feeding circuit, and a data processing unit is also provided in the Beidou receiver.

2. The Beidou antenna status detection system according to claim 1, wherein: A plurality of diodes are connected in series in the power feeding circuit, with a positive voltage applied to the P end of the diode and a negative voltage applied to the N end.

3. The Beidou antenna status detection system according to claim 1, characterized in that: The data processing unit contains an ADC functional component, and a Beidou antenna status judgment program is implanted in the data processing unit.

4. A method for detecting the state of a Beidou antenna, characterized in that: Based on any one of claims 1-3, the system includes two aspects: judging whether the connection status of the Beidou antenna is normal and whether the working status is normal. Two reference values are preset in the data processing unit: When the Beidou antenna is normally connected, the power feeding voltage V1 detected by the data processing unit; When the Beidou antenna is disconnected, the power feeding voltage V2 detected by the data processing unit; Taking these as references, the current power feeding voltage value V actually obtained by the data processing unit is compared with these two reference values, and the following judgments are made: 1) If V < V1, it indicates that the antenna is connected, but the antenna is damaged. 2) If V = V1, it indicates that the antenna is connected properly, and at this time, the system further judges whether the antenna is working normally by the received signal situation. 3) If V1 < V < V2, it indicates that the antenna is connected, but the antenna is damaged. 4) If V = V2, it indicates that the antenna is not connected.

5. The Beidou antenna status detection method according to claim 4, characterized in that: In 2), if V = V1, the system judges whether satellite reception is normal through the positioning valid flag bit of the RMC statement output by the Beidou receiver, and two values A and W of the positioning valid flag bit of the RMC statement are set. When the positioning valid flag bit of the RMC statement = A, it indicates that satellite reception is normal, indicating that the antenna is working normally. When the positioning valid flag bit of the RMC statement = W, it indicates that satellite reception is abnormal, indicating that the antenna is blocked or passive components are damaged.

6. The Beidou antenna status detection method according to claim 4, characterized in that: The V1 and V2 are average values obtained by measuring and calculating with multiple devices for multiple times.

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