Device and method for measuring surface domain soil humidity based on global navigation satellite system-reflection (GNSS-R)
A technology of soil moisture and measuring devices, which is applied in soil material testing, signal transmission systems, instruments, etc., and can solve problems such as not being able to reflect the overall level of soil moisture in the detection area
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Embodiment 1
[0058] like Figure 1-2 Shown, the GNSS-R-based area soil moisture measuring device of the present invention includes a chassis 1, a GNSS reflected signal receiving antenna 2, a GNSS direct signal receiving antenna 3 and a GNSS-R soil moisture measuring host 4 are arranged in the chassis 1, and the chassis 1 1 Set an opening facing the ground, one end of the bracket I5 is fixed on the ground, the other end is vertically inserted into the chassis 1 and fixed to the GNSS-R soil moisture measurement host 4, and the top of the GNSS-R soil moisture measurement host 4 is fixed to the GNSS direct signal receiving antenna 3, Bracket II6 is fixed on the bracket I5 between the GNSS-R soil moisture measurement host 4 and the opening of the chassis 1, and the bracket II6 fixes the GNSS reflected signal receiving antenna 2, and the GNSS-R soil moisture measurement host 4 includes the RF front end and intermediate frequency signal connected in sequence The acquisition module, the FPGA sampl...
Embodiment 2
[0062] like Figure 4 As shown, the present embodiment is the measurement method of the GNSS-R-based area soil moisture measuring device described in embodiment 1, comprising the following steps:
[0063] In the first step, the GNSS direct signal and reflected signal are received by the GNSS direct signal receiving antenna and the GNSS reflected signal receiving antenna respectively, and most of the multipath signals that are not related to the transmission path are suppressed;
[0064] In the second step, the RF front-end performs down-conversion on the direct signal and the reflected signal respectively, and obtains two analog intermediate frequency signals corresponding to the direct signal and the reflected signal respectively;
[0065] In the third step, the intermediate frequency signal acquisition module samples and quantifies the two analog intermediate frequency signals to obtain two digital intermediate frequency signals;
[0066] In the fourth step, the two digital...
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