Fitting method for group time characteristics of radio frequency channel of high-precision navigation receiver
A technology of navigation receiver and radio frequency channel, which is applied in the direction of satellite radio beacon positioning system, measuring device, instrument, etc., can solve the problems of high fitting order and large amount of calculation, and achieve small amount of calculation, simple implementation, and simulated good effect
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Embodiment 1
[0040] refer to figure 1 , the present embodiment provides a method for fitting the time characteristics of a radio frequency channel group of a high-precision navigation receiver, including:
[0041] S1. Use a vector network analyzer to measure the delay characteristics of the radio frequency channel group of the high-precision navigation receiver, and measure the bandwidth.
[0042]The group delay and amplitude characteristics of the receiver signal channel are mainly determined by the RF front-end, and its amplitude and phase characteristics can be approximated to a non-linear phase bandpass filter, where the group delay characteristic is similar to a parabolic shape. Select a certain type of RF front-end module, and use a vector network analyzer to sample the delay characteristics of the RF channel group of the high-precision navigation receiver at equal time intervals, and obtain n groups of sampling points for the delay characteristics of the RF channel group of the high...
Embodiment 2
[0055] This embodiment provides a method for evaluating a fitting effect of a group delay characteristic of a navigation receiver. After the group delay characteristic of the real receiver measured by the vector network analyzer adopts the fitting method of the high-precision navigation receiver radio frequency channel group-time characteristic provided by embodiment 1 to fit, through the coincidence degree of sampling points and The fitting error of the gap between the sampling points evaluates the fitting effect.
[0056] Among them, the fitting effect is evaluated by the coincidence degree of sampling points, and the method is as follows:
[0057] Let the measurement accuracy of the vector network analyzer be t 0 , the coincidence degree of sampling points is defined as the absolute value of the difference between the actual sampling point and the fitted value at the same frequency is less than the instrument measurement accuracy of the vector network analyzer, that is, |g...
Embodiment 3
[0066] S1. In this embodiment, the radio frequency channel group delay characteristics of a certain type of precision navigation receiver measured by a vector network analyzer are as follows: figure 2 As shown, it can be seen that the shape of the group delay characteristic is similar to a parabola, accompanied by certain fluctuations. It is sampled, and the number of sampling points is to match the segment length to obtain the number of segments and effective sampling points. The number of sampling points obtained in this embodiment is n=201, and B=80MHz.
[0067] S2. For Fourier decomposition approximate fitting, the Fourier decomposition coefficient can predict the echo amplitude of the receiver autocorrelation function. Generally speaking, the Fourier coefficient above the fourth order has little influence on the main peak, so In the present embodiment, the Fourier fitting order of each segment is N=3, then the segment length l=7, the segment total number P=33, the effec...
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