Directional antenna impedance adaptation bias device for TSS and test verification method

Abstract

The invention provides a bias device for directional antenna impedance adaptation of a TSS and a test verification method. The bias devices are arranged at antenna receiving and transmitting channels of a traffic monitoring system processor; each bias device comprises a capacitor, a resistor and an inductor; the first end of the capacitor serves as the input end of the bias device to be connected with an antenna transceiving channel of a traffic monitoring system processor, and the second end of the capacitor serves as the output end of the bias device to be connected with a universal instrument or a load. The first end of the resistor is grounded, the second end is connected with the first end of the inductor, and the second end of the inductor is connected with the first end of the capacitor; the working frequency range and the working frequency point of the bias device are consistent with the working frequency range and the working frequency point of the antenna unit of the directional antenna corresponding to the connected antenna transceiving channel; the resistance value of the resistor is determined according to the resistance value of the antenna unit of the directional antenna corresponding to the connected antenna transmit-receive channel. The bias device is simple in hardware implementation circuit, convenient to use in a laboratory and low in cost, impedance matching of the directional antenna can be effectively carried out by using the bias device, and test verification of a traffic monitoring processor in a wired environment in the laboratory is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of radio communication, navigation and monitoring systems, and in particular relates to a bias device for impedance adaptation of a directional antenna of a TSS and a test verification method. Background Art

[0002] Traffic Surveillance System (TSS), the traffic surveillance system integrates air traffic warning and collision avoidance, S-mode transponder, broadcast automatic dependent surveillance and other functions.

[0003] The traffic monitoring system processor contains four transceiver channels for the upper and lower antennas, which are connected to the four antenna units of the upper and lower directional antennas respectively. The four antenna units of the directional antenna are designed with different DC impedances to distinguish and identify different antenna units, and can also be used to detect whether the connection between the transceiver channel of the traffic monitoring system processor and the antenna unit is normal. When the traffic monitoring system is working normally, the antenna impedance detection will be performed. If the antenna impedance detection fails, the system fault will be reported.

[0004] When conducting laboratory wired tests, such as using general instruments to test the transmission frequency, transmission power and other indicators of the traffic monitoring system processor, it is necessary to connect the corresponding channel of the traffic monitoring system processor to the general instrument. In order to avoid the traffic monitoring system reporting system failures due to antenna impedance detection failures, the traffic monitoring system processor needs to perform antenna impedance adaptation when connecting to the general instrument. Summary of the invention

[0005] The present invention provides a bias device for impedance adaptation of a directional antenna of a TSS and a test verification method. The bias device can be used to effectively perform impedance matching of the directional antenna and complete test verification in a wired environment in a laboratory of a traffic monitoring processor.

[0006] The first aspect of the present invention provides a bias device for impedance adaptation of a directional antenna of a TSS, wherein the antenna transceiver channel of the traffic monitoring system processor is provided with a bias device; each bias device comprises: a capacitor, a resistor and an inductor;

[0007] The first end of the capacitor is connected to the antenna transceiver channel of the traffic monitoring system processor as the bias device input end, and the second end of the capacitor is connected to a general instrument or a load as the bias device output end;

[0008] The first end of the resistor is grounded, the second end is connected to the first end of the inductor, and the second end of the inductor is connected to the first end of the capacitor;

[0009] The operating frequency range and operating frequency point of the bias device are consistent with the operating frequency range and operating frequency point of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel;

[0010] The resistance value of the resistor is determined according to the resistance value of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel.

[0011] Optionally, the bias device connected to the transceiver channel of the antenna to be tested is connected to the general instrument through an attenuator.

[0012] Optionally, the traffic monitoring system processor is used to provide a DC voltage to the bias device and detect the current flowing through the resistor, and perform antenna impedance detection based on the ratio of the DC voltage and the current.

[0013] Optionally, the traffic monitoring system processor is used to transmit a radio frequency signal to a general instrument through the antenna transceiver channel and the bias device to be tested, so as to detect the transmission frequency and transmission power of the traffic monitoring system processor.

[0014] Optionally, an impedance error between a resistance value of the resistor and a resistance value of an antenna unit of a directional antenna corresponding to a connected antenna transceiver channel is within a range of ±5%.

[0015] Optionally, the bias device input end is connected to the antenna transceiver channel of the traffic monitoring system processor by a cable, and the bias device output end is connected to a general instrument or a load by a cable.

[0016] Optionally, the bias device has an operating frequency range of 1000 MHz to 1120 MHz, and an operating frequency point of 1030 MHz or 1090 MHz.

[0017] A second aspect of the present invention provides a test verification method for TSS, comprising:

[0018] Connect the antenna transceiver channel of TSS to the bias tee;

[0019] Bias devices are connected to loads or general equipment;

[0020] Use general equipment to detect the transmission frequency and transmission power of the traffic monitoring system processor;

[0021] The bias device adopts the bias device for directional antenna impedance adaptation of TSS as described in any one of the first aspects.

[0022] The present invention provides a bias device and a test verification method for directional antenna impedance adaptation for TSS. The antenna transceiver channel of the traffic monitoring system processor is provided with a bias device; each bias device includes: a capacitor, a resistor and an inductor; the first end of the capacitor is connected to the antenna transceiver channel of the traffic monitoring system processor as the bias device input end, and the second end of the capacitor is connected to a general instrument or a load as the bias device output end; the first end of the resistor is grounded, the second end is connected to the first end of the inductor, and the second end of the inductor is connected to the first end of the capacitor; the bias device operating frequency range and operating frequency point are consistent with the operating frequency range and operating frequency point of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel; the resistance value of the resistor is determined according to the resistance value of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel. The bias device hardware implementation circuit provided by the present invention is simple, convenient to use in the laboratory, and low in cost. The bias device can effectively perform directional antenna impedance matching and complete the test verification in the wired environment in the laboratory of the traffic monitoring processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The following is a schematic diagram of the application of the bias device in the test of the processor of the traffic monitoring system;

[0024] Figure 2 A circuit is formed for the bias tee. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments 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 making creative work are within the scope of protection of the present invention.

[0026] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0029] like Figure 1 and Figure 2 As shown, the present invention provides a bias device for directional antenna impedance adaptation of TSS, and the antenna transceiver channel of the traffic monitoring system processor is provided with a bias device; each bias device includes: a capacitor, a resistor and an inductor;

[0030] The first end of the capacitor is connected to the antenna transceiver channel of the traffic monitoring system processor as the bias device input end, and the second end of the capacitor is connected to a general instrument or a load as the bias device output end;

[0031] The first end of the resistor is grounded, the second end is connected to the first end of the inductor, and the second end of the inductor is connected to the first end of the capacitor;

[0032] The operating frequency range and operating frequency point of the bias device are consistent with the operating frequency range and operating frequency point of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel;

[0033] The resistance value of the resistor is determined according to the resistance value of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel.

[0034] Optionally, the bias device connected to the transceiver channel of the antenna to be tested is connected to the general instrument through an attenuator.

[0035] Optionally, the traffic monitoring system processor is used to provide a DC voltage to the bias device and detect the current flowing through the resistor, and perform antenna impedance detection based on the ratio of the DC voltage and the current.

[0036] Optionally, the traffic monitoring system processor is used to transmit a radio frequency signal to a general instrument through the antenna transceiver channel and the bias device to be tested, so as to detect the transmission frequency and transmission power of the traffic monitoring system processor.

[0037] Optionally, an impedance error between a resistance value of the resistor and a resistance value of an antenna unit of a directional antenna corresponding to a connected antenna transceiver channel is within a range of ±5%.

[0038] Optionally, the bias device input end is connected to the antenna transceiver channel of the traffic monitoring system processor by a cable, and the bias device output end is connected to a general instrument or a load by a cable.

[0039] Optionally, the bias device has an operating frequency range of 1000 MHz to 1120 MHz, and an operating frequency point of 1030 MHz or 1090 MHz.

[0040] For example, the DC impedances of the four antenna units of the directional antenna of the traffic monitoring system are Rp1, Rp2, Rp3, and Rp4. When the traffic monitoring system is working, the traffic monitoring system processor will automatically detect the DC impedance of the connected antenna unit, and report a system failure if the DC impedance is incorrect.

[0041] When conducting wired tests in the laboratory, it is necessary to connect a bias device between the traffic monitoring system processor and general test instruments (such as spectrum analyzers, signal sources, etc.) for impedance matching to avoid the traffic monitoring system reporting system failures, such as Figure 1 shown.

[0042] The bias device design method of the present invention includes the following contents:

[0043] 1. Design 4 bias devices for antenna impedance adaptation, which are respectively adapted to the impedance of the 4 antenna units of the antenna. The DC impedances are Rp1, Rp2, Rp3, and Rp4, respectively, and the allowable impedance error is ±5%.

[0044] 2. The bias tee is designed as a two-port device, such as Figure 2 As shown, they are the RF input terminal and the RF output terminal, respectively. The RF input terminal is connected to the traffic monitoring system processor, and the RF output terminal is connected to the attenuator and the general test instrument.

[0045] 3. The bias device is composed of an AC blocking inductor L1, a characteristic resistor Rp, and a DC blocking capacitor C1. The circuit is as follows: Figure 2 shown.

[0046] 4. The operating frequency range of the bias tee is 1000MHz~1120MHz, and the operating frequency points are 1030MHz and 1090MHz.

[0047] 5. The signal input at the RF input terminal RFin is a 1030MHz / 1090MHz RF signal RF and a periodic DC signal DC. When the signal enters the bias tee, the DC signal DC cannot enter the RF output terminal due to the presence of the DC blocking capacitor C1, so the signal output at the RF output terminal RFout is only the 1030MHz / 1090MHz RF signal RF; when the signal enters the bias tee, because the inductor L1 blocks the AC and passes the DC, for the 1030MHz / 1090MHz RF signal RF, the current flowing through this branch is much smaller than the current flowing through the capacitor C1 branch and the current caused by the DC voltage, and can be ignored; for the DC signal DC, the impedance of the inductor L1 is much smaller than the characteristic impedance Rp, and L1 is equivalent to a direct pass without causing a voltage drop. Therefore, by inputting a DC voltage signal at the RF input terminal, the voltage U, and testing the generated current I, Rp = U / I. This method can detect the DC impedance Rp of the port.

[0048] The above description is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which belong to the protection scope of the present invention.

Claims

1. A bias device for impedance matching of a directional antenna of a TSS, characterized in that: A bias device is provided at the antenna transceiver channel of the traffic monitoring system processor; each bias device includes: a capacitor, a resistor and an inductor; The first end of the capacitor is connected to the antenna transceiver channel of the traffic monitoring system processor as the bias device input end, and the second end of the capacitor is connected to a general instrument or a load as the bias device output end; The first end of the resistor is grounded, the second end is connected to the first end of the inductor, and the second end of the inductor is connected to the first end of the capacitor; The operating frequency range and operating frequency point of the bias device are consistent with the operating frequency range and operating frequency point of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel; The resistance value of the resistor is determined according to the resistance value of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel.

2. The bias device for directional antenna impedance adaptation for TSS according to claim 1, characterized in that: The bias device connected to the transmitting and receiving channels of the antenna to be tested is connected to the general instrument through an attenuator.

3. The bias device for directional antenna impedance adaptation for TSS according to claim 1, characterized in that: The traffic monitoring system processor is used to provide a DC voltage to the bias device and detect the current flowing through the resistor, and perform antenna impedance detection according to the ratio of the DC voltage and the current.

4. The bias device for directional antenna impedance adaptation for TSS according to claim 1, characterized in that: The traffic monitoring system processor is used to transmit radio frequency signals to the general instrument through the antenna transceiver channel and the bias device to be tested, so as to detect the transmission frequency and transmission power of the traffic monitoring system processor.

5. The bias device for directional antenna impedance adaptation for TSS according to claim 1, characterized in that: The impedance error between the resistance value of the resistor and the resistance value of the antenna unit of the directional antenna corresponding to the connected antenna transceiver channel is within the range of ±5%.

6. The bias device for directional antenna impedance adaptation for TSS according to claim 1, characterized in that: The bias device input end is connected to the antenna transceiver channel of the traffic monitoring system processor by a cable, and the bias device output end is connected to a general instrument or a load by a cable.

7. The bias device for directional antenna impedance adaptation for TSS according to claim 1, characterized in that: The operating frequency range of the bias tee is 1000MHz to 1120MHz, and the operating frequency point is 1030MHz or 1090MHz.

8. A test verification method for TSS, characterized in that: include: Connect the antenna transceiver channel of TSS to the bias trolley; Bias devices are connected to loads or general equipment; Use general equipment to detect the transmission frequency and transmission power of the traffic monitoring system processor; The bias device adopts the bias device for directional antenna impedance adaptation of TSS as described in any one of claims 1 to 7.

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