Aviation secondary radar signal emitter and coding method

A technology of secondary radar and transmitting device, applied in the field of avionics, can solve the problems of low reliability, complicated circuit and huge size, and achieve the effect of simple and reliable circuit and good modulation performance.

Inactive Publication Date: 2018-04-27
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmitting circuit of the aviation secondary radar signal using analog circuit technology is complicated, huge and has low reliability.

Method used

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  • Aviation secondary radar signal emitter and coding method
  • Aviation secondary radar signal emitter and coding method
  • Aviation secondary radar signal emitter and coding method

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Embodiment 1

[0032] The invention discloses a transmitting device for aviation secondary radar signals. The hardware principle is as follows Figure 4 Shown, including FPGA and D / A converter;

[0033] FPGA is configured to generate message signals in each test mode, and after baseband resampling and interpolation filtering are performed on the message signals, the pulse signal is modulated onto a digital carrier signal by means of full digital up-conversion;

[0034] The D / A converter is configured to convert the digital signal generated by the FPGA into a radio frequency transmission signal.

Embodiment 2

[0036] On the basis of the above embodiments, the present invention discloses a coding method for aviation secondary radar signals for aviation transponders and rangefinders, which specifically includes the following steps:

[0037] Step 1: Generate message signals in each mode to be transmitted;

[0038] Use FPGA for signal processing, supplemented by digital signal operations including partial encoding and control through DSP, and prepare message signals in each mode to be transmitted according to the commands of the CPU;

[0039] Step 2: After baseband resampling and interpolation filtering, the pulsed baseband signal is modulated onto the digital carrier signal by means of full digital up-conversion inside the FPGA;

[0040] Step 3: The digital signal generated by the FPGA is converted by the D / A converter to output the required radio frequency transmission signal;

[0041] In the present invention, the high-speed DDS and all-digital up-conversion technology are mainly realized by a...

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Abstract

The invention discloses an aviation secondary radar signal emitter and a coding method and belongs to the aviation electronic technology field. The emitter comprises an FPGA and a D / A converter. A radio system is utilized, analog components of secondary radar emission signal circuits of a transponder and a range finder are minimized, signal codes and up conversion are processed through a digital circuit, message signals in each test mode are generated through the FPGA, namely interrogation messages in ATCRBS and S mode transponder test modes, after baseband re-sampling and interpolation filtering, etc., pulse signals are modulated onto digital carrier signals in the FPGA through an all-digital up-conversion mode, after high-speed D / A conversion, required RF pulse signals are directly generated, and emission signals required in various modes are generated in real time through the FPGA and high-speed D / A. The circuit is simple and reliable, and modulation performance is good.

Description

Technical field [0001] The invention belongs to the technical field of avionics, and specifically relates to a transmitting device and an encoding method of an aviation secondary radar signal. Background technique [0002] Air Traffic Control Transponder (ATC Transponder) and Distance Measure Equipment (DME) are both necessary equipment for the normal flight of the aircraft. The function of the transponder is to report the aircraft's identification code and the aircraft's air pressure to the ground control center. The rangefinder is used to measure the slant distance between the aircraft and the ground ranging beacon. [0003] Both transponder and rangefinder use secondary radar system. The transponder needs to transmit a 1030MHz pulse interrogation signal. The ranging machine needs to transmit a ranging response signal of 962MHz-1213MHz. [0004] At present, both transponders and rangefinders use complex analog circuits with numerous components, complex circuit structures, and l...

Claims

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Application Information

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IPC IPC(8): G01S13/76G01S13/78
CPCG01S13/767G01S13/788
Inventor 李晓慧吴恒奎成华强顾军
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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