System transceiving isolation protection time testing method and system

Abstract

The invention provides a system transceiving isolation protection time testing method and system. The method comprises the following steps: transmitting radiation signals of transmitting equipment directly correspond to pulse signals of a system; a transmitting antenna of transmitting equipment is taken down, and a transmitting radiation signal is input to a high-power load through a coupler by a radio frequency cable; after the emission radiation signal is attenuated through a low-power coupling output end of the coupler, the emission radiation signal is radiated to a receiving antenna of emission equipment through a radio frequency cable and a directional radiation antenna; setting a distance R between the directional radiation antenna and the receiving antenna; and adjusting the receiving and transmitting isolation protection time of the system until the signal detection indication pulse signal cannot be received in a low time sequence period of the system. According to the invention, the limitation that the system transceiving isolation protection time index test work can only be carried out in a darkroom is solved, so that the index can be tested in open areas such as an outfield parking apron or a runway, and the development and production efficiency of the system is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the field of electronic technology, and in particular to a method and system for testing system transceiver isolation protection time. Background Art

[0002] The conversion time indicator from transmission to reception in the receiving and transmitting aperture time-sharing working system is particularly important (i.e. the system transmission and reception isolation protection time), which directly affects the conversion speed between the system transmission radiation and the system detection and reception.

[0003] The typical system transmit and receive isolation protection time test principle is shown in Figure 0. The specific steps are as follows:

[0004] (1) The signal source radiates analog signals to the transmitting device through the signal simulation antenna;

[0005] (2) After receiving the analog signal through the receiving antenna, the transmitting device generates a transmitting signal and radiates it through the transmitting antenna;

[0006] (3) The spectrum analyzer receives the transmitted signal through the transmitting signal detection antenna to check whether the radiation status of the transmitting device is normal (such as power, transmitting signal frequency, etc.);

[0007] (4) By adjusting the system's transmit-receive isolation protection time, check and confirm until the transmitting device can no longer receive the signal from its own transmitting antenna (the minimum interval time is taken as the system's transmit-receive isolation protection time).

[0008] Due to the above process, the following factors need to be strictly controlled:

[0009] (1) In the test environment, except for the analog signal radiated by the signal source and the transmission signal radiated by the transmitting device, no redundant RF signal can be received by the transmitting device;

[0010] (2) The transmitting device can only detect the direct signal of the analog signal radiated by the signal source, and the analog signal cannot be reflected and received by the transmitting device;

[0011] (3) It is also necessary to ensure that the transmission signal emitted by the transmitting device cannot be received by the transmitting device itself after being reflected.

[0012] Due to the above factors, the testing environment is limited. Summary of the invention

[0013] In view of the above-mentioned problems, the present invention aims to provide a system transceiver isolation protection time testing method and system, which can realize the transceiver isolation protection time test of the transmitting system on the apron with a relatively low cost and economical method.

[0014] The present invention provides a method for testing the system receiving and sending isolation protection time, comprising the following steps:

[0015] S1, the transmission radiation signal of the transmitting device directly radiates the pulse signal with the specified frequency and duty cycle according to the system settings;

[0016] S2, remove the transmitting antenna of the transmitting device, and input the transmitting radiation signal to the high-power load through the coupler via the RF cable;

[0017] S3, after attenuating the transmission radiation signal through the low-power coupling output end of the coupler, radiates the transmission radiation signal to the receiving antenna of the transmitting device through the radio frequency cable and the directional radiation antenna;

[0018] S4, setting the distance R between the directional radiation antenna and the receiving antenna;

[0019] S5, adjusting the system receiving and transmitting isolation protection time until no signal detection indication pulse signal is received during the low period of the system timing.

[0020] Furthermore, in step S3, the transmitted radiation signal is attenuated according to the low-power coupled output index of the coupler.

[0021] Furthermore, it is assumed that after the transmitter is installed, the isolation between the receiving antenna and the transmitting antenna is L0, and the transmitting power of the transmitter is P T , the transmitting antenna gain is G T , the total gain of the RF cable, the low-power coupled output of the coupler, and the directional radiation antenna is G x ; The distance R between the directional radiating antenna and the receiving antenna is calculated as follows:

[0022] R = Anti_log{(G x +L0-G T -32.4-20*log 10 F) / 20}

[0023] Wherein, F is the frequency of the emitted radiation signal.

[0024] Furthermore, the isolation degree L0 between the receiving antenna and the transmitting antenna is determined by simulation calculation or actual installation measurement.

[0025] The present invention also provides a system transceiver isolation protection time test system, including a transmitting device, a coupler, a high-power load and a directional radiation antenna;

[0026] The transmitting antenna port of the transmitting device is not connected to the transmitting antenna, but is connected to a high-power load through a radio frequency cable and a coupler;

[0027] The low-power coupling output end of the coupler is connected to the directional radiation antenna through a radio frequency cable;

[0028] The directional radiating antenna is used to radiate the transmitted radiation signal to the receiving antenna of the transmitting device;

[0029] The distance between the directional radiating antenna and the receiving antenna is R;

[0030] The system transceiver isolation protection time test is completed by adjusting the system transceiver isolation protection time until no signal detection indication pulse signal is received during the system timing is low.

[0031] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0032] The present invention solves the limitation that the system receiving and transmitting isolation protection time index test can only be carried out in a darkroom, so that this index can be tested in open areas such as outdoor aprons or runways (without being affected by external electromagnetic signals), effectively improving the efficiency of system development and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a typical system transmit and receive isolation protection time test schematic.

[0034] Figure 2 The schematic diagram is a schematic diagram of a system receiving and sending isolation protection time test in an embodiment of the present invention.

[0035] Figure 3 It is a timing diagram of the system receiving and sending isolation protection time test in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0038] Example

[0039] like Figure 2 As shown, this embodiment proposes a system receiving and sending isolation protection time testing method, comprising the following steps:

[0040] S1, the emission radiation signal of the transmitting device does not depend on the external signal, and directly radiates the pulse signal of the specified frequency and duty cycle according to the system settings; the specific system cutting sequence is as follows Figure 3 As shown;

[0041] S2, remove the transmitting antenna of the transmitting device, and input the transmitting radiation signal to the high-power load through the coupler via the RF cable to prevent the transmitting signal from radiating into space and causing the reflected signal to be received by the transmitting device;

[0042] S3, after attenuating the transmitted radiation signal by about 40dB (the low-power coupled output index of the coupler) through the low-power coupled output end of the coupler, the transmitted radiation signal is radiated to the receiving antenna of the transmitting device through the RF cable and the directional radiation antenna;

[0043] S4, setting the distance R between the directional radiation antenna and the receiving antenna;

[0044] Assume that after the transmitter is installed, the isolation between the receiving antenna and the transmitting antenna is L0 (which can be determined by simulation calculation or actual installation measurement), and the transmitting power of the transmitter is P T , the transmitting antenna gain is G T , Figure 2 The total gain of the RF cable, the coupler low-power coupled output, and the directional radiating antenna is G x , then the above parameters satisfy the following conditions:

[0045] P T +G T -L0=P T +G x -(32.4+20*log 10 F+20*log 10 R)

[0046] in:

[0047] F is the frequency of the emitted radiation signal, in MHz;

[0048] R is the distance between the directional radiation antenna and the receiving antenna, in km;

[0049] Therefore, R can be calculated according to this formula:

[0050] R = Anti_log{(G x +L0-G T -32.4-20*log 10 F) / 20}

[0051] S5, adjust the system transceiver isolation protection time until the system timing is low and no signal detection indication pulse signal is received, such as Figure 3shown.

[0052] Example 2

[0053] like Figure 2 As shown, this embodiment proposes a system receiving and transmitting isolation protection time test system, including a transmitting device, a coupler, a high-power load and a directional radiation antenna;

[0054] The transmitting antenna port of the transmitting device is not connected to the transmitting antenna, but is connected to a high-power load through a radio frequency cable and a coupler;

[0055] The low-power coupling output end of the coupler is connected to the directional radiation antenna through a radio frequency cable;

[0056] The directional radiating antenna is used to radiate the transmitted radiation signal to the receiving antenna of the transmitting device;

[0057] The distance between the directional radiating antenna and the receiving antenna is R;

[0058] The system transceiver isolation protection time test is completed by adjusting the system transceiver isolation protection time until no signal detection indication pulse signal is received during the system timing is low.

[0059] The specific process can be referred to in Example 1, which will not be described in detail here.

[0060] An application example: The method of the present invention is used to test the system receiving and transmitting isolation index of a certain type of airborne equipment after installation. The test, which could only be carried out in a darkroom, can now be carried out on an open apron, and the measured protection time index can be matched for on-board application.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system receiving and sending isolation protection time testing method, characterized in that: The steps include: S1, the transmission radiation signal of the transmitting device directly radiates the pulse signal with the specified frequency and duty cycle according to the system settings; S2, remove the transmitting antenna of the transmitting device, and input the transmitting radiation signal to the high-power load through the coupler via the RF cable; S3, after attenuating the transmitted radiation signal through the low-power coupling output end of the coupler, radiates the transmitted radiation signal to the receiving antenna of the transmitting device through the radio frequency cable and the directional radiation antenna; S4, setting the distance R between the directional radiation antenna and the receiving antenna; S5, adjusting the system receiving and transmitting isolation protection time until no signal detection indication pulse signal is received during the low period of the system timing.

2. The system receiving and sending isolation protection time testing method according to claim 1 is characterized in that: In step S3, the transmitted radiation signal is attenuated according to the low-power coupled output index of the coupler.

3. The system receiving and sending isolation protection time testing method according to claim 1 is characterized in that: Assume that after the transmitter is installed, the isolation between the receiving antenna and the transmitting antenna is L0, and the transmitting power of the transmitter is P T , the transmitting antenna gain is G T , the total gain of the RF cable, the low-power coupled output of the coupler, and the directional radiation antenna is G x ; The distance R between the directional radiation antenna and the receiving antenna is calculated as follows: R=Anti_log{(G x +L0-G T -32.4-20*log 10 F) / 20} Wherein, F is the frequency of the emitted radiation signal.

4. The system receiving and sending isolation protection time testing method according to claim 3 is characterized in that: The isolation degree L0 between the receiving antenna and the transmitting antenna is determined by simulation calculation or actual installation measurement.

5. A system transceiver isolation protection time test system, characterized in that: Includes transmitting equipment, couplers, high-power loads and directional radiating antennas; The transmitting antenna port of the transmitting device is not connected to the transmitting antenna, but is connected to a high-power load through a radio frequency cable and a coupler; The low-power coupling output end of the coupler is connected to the directional radiation antenna through a radio frequency cable; The directional radiating antenna is used to radiate the transmitted radiation signal to the receiving antenna of the transmitting device; The distance between the directional radiating antenna and the receiving antenna is R; The system transceiver isolation protection time test is completed by adjusting the system transceiver isolation protection time until no signal detection indication pulse signal is received during the system timing is low.

6. The system receiving and transmitting isolation protection time test system according to claim 5, characterized in that: Assume that after the transmitter is installed, the isolation between the receiving antenna and the transmitting antenna is L0, and the transmitting power of the transmitter is P T , the transmitting antenna gain is G T , the total gain of the RF cable, the low-power coupled output of the coupler, and the directional radiation antenna is G x ; The distance R between the directional radiation antenna and the receiving antenna is calculated as follows: R=Anti_log{(G x +L0-G T -32.4-20*log 10 F) / 20} Wherein, F is the frequency of the emitted radiation signal.

7. The system for testing the transmission and reception isolation protection time according to claim 6, characterized in that: The isolation degree L0 between the receiving antenna and the transmitting antenna is determined by simulation calculation or actual installation measurement.

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