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Multi-band, multi-function integrated transceiver
| Details |
Inventors: Weinberg, Aaron; Harlacher, Marc; Bierly, Scott; Cunningham, Kenneth; Urban, Daniel;
Assignee: ITT Manufacturing Enterprises, Inc. (Wilmington, DE)
Primary Examiner: Phan; Dao
Assistant Examiner:
Attorney, Agent or Firm: Zegeer; Jim
A communications system operating in one or more frequency bands of various number of channels per band (for a total of N channels), and a novel transceiver for receiving these multiple bands of signals. The transceiver comprises an antenna and RF front end for each said band, a separate RF to IF downconverter for each said band. The IF for each band is centered at a succession of frequencies F.sub.o such that the spectra for each band are non-overlapping, with the center frequencies. Analog-to-digital converter sampling rate is chosen such that one band is centered at baseband, and one or more other bands are centered at a specific relationship with the sampling rate such that each band is individually downconverted to baseband by appropriate selection of tap weight multiplying sequences (such as alternating +/- sequence for the case of F.sub.o equal to one-fourth the sampling rate). An analog-to-digital converter converts analog signals to digital signals from the combiner. A digital downconverter converts the digital signals to baseband signals and a single digital processor sequentially time shared among all the bands and channels. |
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DETAILED DESCRIPTION OF THE INVENTION In the receiver shown in FIG.
1, a B-band, N-channel receiver is disclosed having functional antennae A-1 .
.
.
A-B coupled via amplifiers to corresponding RF/IF converters 10-1 .
.
.
10-B which are supplied from corresponding frequency synthesizers 11-1 .
.
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11-B which in turn are supplied, preferably, from a common frequency source 12.
The IF signals are bandpass filtered in 13-A .
.
.
13-B and then combined 14, analog to digital converted 15, downconverted 16, and passed to N-channel digital matched filter 17.
The output of N-=channel sequential digital matched filter 17 is demodulated in demodulator means 18 and the demodulated signals for the various channels are processed in data handler or processor 19 and supplied to various utilization devices 20-1 .
.
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20-B.
Referring to FIG.
2, the upper portion 22 of the block diagram is an illustration of an example embodiment of the invention, an L-band (GPS) receiver having a separate frequency synthesizer 23 and RF front end 24 with a navigation processor 25 outputting GPS location signals and a separate S-band (TDRSS) processing channel 25 including an RF front end 26 and a separate receiver channel with a separate frequency synthesizer 27 and a separate transmitter channel having its own modulator 28, upconverter 29 and high-powered amplifier 30 feeding a diplexer 31 for transmissions on the S-band.
According to the present invention, the integrated TDRSS/GPS transceiver maintains separate RF front ends 32, 33 and RF/IF downconverters 34, 35 for both the TDRSS signals, channels and the GPS signal channels (S-band and L-band, respectively).
However, according to the present invention, the transceiver has common frequency synthesis 36 and clock reference signals with carefully allocated frequency plans to minimize distinct frequencies and clocks.
In addition, the present invention combines the TDRSS and GPS signals from bandpass filters BPF in combining 37 at intermediate frequency (IF) and shares all remaining circuitry to the maximum extent possible
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Telecommunications 
