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.
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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
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