All band GNSS receiver
One embodiment of the present invention provides a signal-recording system. During operation, the system receives a plurality of radio frequency (RF) signals, separates the RF signals to obtain a first group of RF signals in a first RF band and a second group of RF signals in a second RF band, and simultaneously down-converts the first group of RF signals to a first group of low intermediate-frequency (low-IF) signals in a first IF band and the second group of RF signals to a second group of low-IF signals in a second IF band. The system further converts the first group of low-IF signals and the second group of low-IF signals to the digital domain, and simultaneously processes all of the converted low-IF signals.
1. A method, comprising:
receiving a plurality of radio frequency (RF) signals;
separating the RF signals to obtain a first group of RF signals in a first RF band and a second group of RF signals in a second RF band;
simultaneously down-converting the first group of RF signals to a first group of low intermediate-frequency (low-IF) signals in a first IF band and the second group of RF signals to a second group of low-IF signals in a second IF band;
combining the first group of low-IF signals and the second group of low-IF signals to produced a combined low-IF signal;
converting, using an analog-to-digital converter (ADC) module, the combined low-IF signal to digital domain to obtain a combined digital signal; and
processing the combined digital signal, which involves applying digital filters to the combined digital signal to produce a separate output signal from each digital filter's output.
2. The method of claim 1 , further comprising processing the combined digital signal using a digital signal processor (DSP) that includes multiple processing units.
3. The method of claim 1 , wherein a frequency spacing between the first RF band and the second RF band is greater than a frequency spacing between the first IF band and the second IF band.
4. The method of claim 3 , wherein a frequency spacing between the first RF band and the second RF band is at least 200 MHz.
5. The method of claim 1 , wherein the RF signals include satellite signals from multiple global navigation satellite systems.
6. The method of claim 5 , further comprising generating a combined positioning output based on the satellite signals from the multiple global navigation satellite systems.
7. The method of claim 5 , wherein the multiple global navigation satellite systems include:
Global Positioning System (GPS);
Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS);
Compass navigation system; and
Galileo positioning system.
8. The method of claim 1 , wherein a bandwidth of the received RF signals exceeds 400 MHz.
9. A system, comprising:
a wideband antenna configured to receive a plurality of radio frequency (RF) signals which include a first group of RF signals in a first RF band and a second group of RF signals in a second RF band;
two band-pass filters (BFPs), each configured to select a corresponding group of RF signals;
two down-converters, each for a selected group of RF signals, wherein the down-converters are configured to simultaneously down-convert the first group of RF signals to a first group of low intermediate-frequency (low-IF) signals in a first IF band and the second group of RF signals to a second group of low-IF signals in a second IF band;
a combiner configured to combine the first group of low-IF signals and the second group of low-IF signals to produce a combined low-IF signal;
an analog-to-digital converter (ADC) module configured to convert the combined low-IF signal to digital domain to obtain a combined digital signal; and
a digital signal processor (DSP) configured to process the combined digital signal, wherein the DSP includes a plurality of digital filters and a plurality of processing units, wherein a respective processing unit is configured to process an output of a corresponding digital filter.
10. The system of claim 9 , wherein a frequency spacing between the first RF band and the second RF band is greater than a frequency spacing between the first IF band and the second IF band.
11. The system of claim 10 , wherein a frequency spacing between the first RF band and the second RF band is at least 200 MHz.
12. The system of claim 9 , wherein the RF signals include satellite signals from multiple global navigation satellite systems.
13. The system of claim 12 , further comprising an output generation mechanism configured to generate a combined positioning output based on the satellite signals from the multiple global navigation satellite systems.
14. The system of claim 12 , wherein the multiple global navigation satellite systems include:
Global Positioning System (GPS);
Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS);
Compass navigation system; and
Galileo positioning system.
15. The system of claim 9 , wherein a bandwidth of the received RF signals exceeds 400 MHz.