Radar feeder standing wave protector

Abstract

The invention discloses a radar feeder standing wave protector, which belongs to the technical field of radars. The radar feeder standing wave protector comprises a digital signal processor (DSP) serving as a microcontroller, a band-pass filter, a detector, an amplifier, a benchmark, an electrically erasable read-only memory (EEROM), a crystal oscillator, a level translator, a latch, a driver, a sound-light alarm device and a power conversion unit, and also comprises a controller area network (CAN) interface module and a recommended standard-422 (RS422) interface. In work, a feeder standing wave ratio is calculated rapidly by taking the DSP as a core, so that a radar standing wave tiny change can be discovered timely, the work of a radar transmitter is stopped and sound and light alarm is performed; a standing wave ratio guard interval can be set flexibly through a CAN bus; a fault state can be reported to a monitoring station or the state is inquired and monitored through the monitoring station; therefore, the radar feeder standing wave protector is suitable for remote monitoring. In the radar feeder standing wave protector, the connection is relatively independent, the cost is relatively low, the guard interval is very convenient to modify, and circuits are highly simplified; and the radar feeder standing wave protector has expansibility in the radars of different model numbers.

Description

technical field [0001] The invention relates to a radar feeder standing wave protector, which belongs to the technical field of radar. Background technique [0002] The feeder system of the radar is an important channel for transmitting and receiving signals. For centralized radars, since these signals are of high power, the hard coaxial cable connection is generally used. The feeder of this connection structure is long In the process of working for a long time, wear or abnormal movement will inevitably occur, resulting in poor contact; or when the airtightness fails, humid air or rainwater will enter the feeder, these factors will lead to the deterioration of the standing wave ratio of the feeder system and the reflection power If it is too large, it may even spark at the connection, which will burn the receiver in severe cases. [0003] Most of the existing standing wave protection designs only judge and process according to the reflected power coupling signal, and protec...

AI Technical Summary

Problems solved by technology

[0002] The feeder system of the radar is an important channel for transmitting and receiving signals. For centralized radars, since these signals are of high power, the hard coaxial cable connection is generally used. The feeder of this connection structure is long In the process of working for a long time, wear or abnormal movement will inevitably occur, resulting in poor contact; or when the airtightness fails, humid air or rainwater will enter the feeder, these factors will lead to the deterioration of the standing wave ratio of the feeder system and the reflection power If it is large, it may even spark at the connection, which will burn the receiver in severe cases

[0003] Most of the existing standing wave protection designs only judge and process according to the reflected power coupling signal, and protect or alarm when a certain threshold is exceeded. Since most radars work in a wide frequency band, due to the flatness of the band, each frequency of the transmitter The output power of different points is different. At some frequency points with low output power, even if the feeder standing wave ratio becomes worse than the index range, the absolute value of the reflected power may not exceed the alarm threshold, which is easy to cause false alarms.

Chinese invention patents "A Design Method for a Novel Integrated Standing Wave Ratio Measurement Module" (Publication No.: CN1553200A, Publication Date: 2004-12-08) and "A Method and Device for Detecting the Connection Status of Antennas and Feeders" (authorized No.: CN100568785C, date of authorization: 2009-12-09), Chinese utility model patent "on-line monitoring device for antenna and feeder standing wave and power" (authorization number: CN201251602Y, date of authorization: 2009-06-03) and "wireless communication network base station antenna Feeder standing wave ratio online test device" (authorization number: CN201096838Y, authorization date: 2008-08-06) discloses that it can perform antenna feeder standing wave test or protection online, all of which are used in the field of mobile communication, without considering out-of-band False alarms caused by interference; at the same time, the adaptability of the product is not strong, because different users will be affected by factors such as individuals and the environment, resulting in different alarm thresholds. The above inventions or utility models need to modify the software program to meet the requirements. Require

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