Open-circuit short-circuit detection circuit of car-mounted terminal antenna

Abstract

The invention provides an open-circuit short-circuit detection circuit of a car-mounted terminal antenna. A first triode base is connected with a second triode base and a collector; a first triode collector is connected with a fifth resistor and a sixth resistor which are serially connected with each other; one end of the sixth resistor, which is connected with the fifth resistor, is grounded, and the other end of the sixth resistor is connected with a second triode collector and is connected with a first voltage collection point through a seventh resistor at the same time; a first triode emitter is connected with a power supply through a third resistor; a second triode emitter is connected with the power supply through a first capacitor and a first resistor which are parallelly connected with each other; the second triode emitter is connected with the antenna through an inductor; the inductor and the antenna are grounded through a second capacitor; the second triode emitter is connected with a second voltage collection point through a second resistor; and the second resistor and the second voltage collection point are grounded through a fourth resistor. With the adoption of the open-circuit short-circuit detection circuit, whether a compass navigation satellite system (CNSS) or a global positioning system (GPS) antenna is in an open circuit and a short circuit state or not is automatically detected.

Description

technical field [0001] The invention relates to an antenna open-circuit short-circuit detection circuit, in particular to a vehicle-mounted terminal antenna open-circuit short-circuit detection circuit. Background technique [0002] Navigation equipment mainly uses CNSS (Beidou) or GPS positioning. When there is a problem with CNSS or GPS positioning, it is first necessary to analyze whether there is a short circuit or open circuit in the CNSS or GPS antenna. Often with the help of detection tools such as multimeters, etc., measure whether the connection between the antenna input side and the device input is normal, and at the same time measure whether there is a short circuit between the antenna input side and the ground. [0003] The traditional method is to detect manually with tools, which is very cumbersome. First of all, the antenna is connected to the device. The prerequisite for detection is to disassemble the device. The process is cumbersome and complicated, and o...

AI Technical Summary

Problems solved by technology

[0003] The traditional method is to detect manually with tools, which is very cumbersome

First of all, the antenna is connected to the device. The prerequisite for detection is to disassemble the device. The process is cumbersome and complicated, and other detection tools are required.

Some CNSS or GPS positioning devices are installed inside the car body. If you want to check whether there is a problem with the connection of the CNSS or GPS antenna, you need to disassemble the device from the car body, which is time-consuming and laborious. You also need to go to a special repair shop or car 4S shop. testing, money

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