Digital processing method of altimeter of linear frequency modulation continuous wave radar
A technology of linear frequency modulation and processing method, which is applied in the reflection/re-radiation of radio waves, radio wave measurement systems, and utilization of re-radiation, etc. It can solve the problems of increased calculation amount and large relative error of radar altimeter.
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[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0034] The present invention proposes a digital processing method of a linear frequency modulation continuous wave radar altimeter, such as figure 1 shown, including the following steps:
[0035] Step 1: Obtain the beat signal from the front-end quadrature mixer of the radar altimeter, and perform A / D sampling and quantization on the beat signal to obtain a digital signal sequence x(n);
[0036]The beat signal x(t) is obtained from the front-end quadrature mixer of the radar altimeter, and the beat frequency of the beat signal is nominally f p , is a continuous constant beat signal, carrying random noise signal, the beat signal is A / D sampled, and the sampling frequency is f s , after sampling, the digital signal sequence x(n) is obtained.
[0037] The acquisition process of the beat signal: as figure 2 As shown, the sawtooth wave voltage signal generate...
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