Anti-interference A/D (analog-to-digital) chip for Compass satellite navigation

Abstract

The invention provides an anti-interference A / D chip for Compass satellite navigation, which is integrated with a signal channel A and a signal channel B at the same time to receive two channels of medium-frequency analog signals and respectively output 4-bit digital signals. The channel A is designed as a second-generation Compass B3 frequency point signal receiving channel, and receives 46.52MHz of medium-frequency analog signals; the channel B is designed as a first-generation Compass S frequency point signal receiving channel, and receives 12.24MHz of medium-frequency analog signals; the channel A and the channel B can carry out anti-interference or straight-through processing on input signals according to interference types and pin configuration, and after the amplitudes of the processed signals are regulated by digital AGCs (automatic gain controller), 4-bit digital signals are outputted by each channel. The anti-interference A / D chip for Compass satellite navigation can simultaneously receive and process the medium-frequency satellite navigation signals of the second-generation Compass B3 frequency point and the first-generation Compass S frequency point in the Compass satellite system, and can meet the requirement of hand-held receivers on the teletext reception and integrated positioning of the Compass satellite system.

Description

technical field [0001] The invention belongs to the technical field of electronic components, in particular to a digital-analog hybrid chip, in particular to a Beidou satellite system anti-jamming A / D chip with dual channels and anti-dual-channel narrowband interference, which can be configured to realize Beidou-2 B3 frequency point and Beidou-1 S frequency point reception and combined positioning requirements. Background technique [0002] The signal of the satellite navigation signal reaching the receiving antenna is very weak, usually submerged in noise, and is easily interfered by external interference signals and harmonics of the same frequency. In severe cases, the satellite navigation system cannot be used normally. Currently commonly used anti-interference means include shielding, isolation, filtering, grounding and software processing. [0003] Such as figure 1 As shown, the traditional receiving end usually adopts FPGA or dual-chip to realize dual-frequency combi...

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Problems solved by technology

[0003] like figure 1 As shown, the traditional receiving end usually adopts FPGA or dual-chip to realize dual-frequency combined positioning. If FPGA is directly applied to miniaturized equipment, it will inevitably lead to major changes in the original circuit, which will result in reduced reliability and Volume, power consumption, and cost have increased significantly; the use of dual-chip methods will greatly increase the number of pins connected to the circuit, resulting in increased power consumption and volume, which is not suitable for applications in mobile terminals and small handheld devices; and if the receiver Anti-jamming and combined positioning processing in the chip will occupy a lot of resources of the receiver processor and reduce the receiver's calculation performance

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