Common receive module for a programmable digital radio

• US 5,859,878 A
• Filed: 08/31/1995
• Issued: 01/12/1999
• Est. Priority Date: 08/31/1995
• Status: Expired due to Fees

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc), Northrop Grumman Corporation
• Original Assignee: Northrop Grumman Corporation
• Inventors: Siegel, Arnold B., Weigand, Benjamin F., Nogay, Richard H., Phillips, William C., Minarik, Ronald W., Schmidt, Kenneth M., Prill, Robert S., Pascale, Michael V., Dirndorfer, Walter M.
• Primary Examiner(s): Chan, Jason
• Assistant Examiner(s): Corrielus, Jean B
• Application Number:
  US08/528,206
• Time in Patent Office: 1,230 Days
• Field of Search: 375/219, 375/222, 375/239, 375/261, 375/262, 375/269, 375/279, 375/316, 375/320, 375/322, 375/329, 375/270, 375/268, 370/304, 370/305, 455/145, 455/186.1, 455/313, 455/74, 455/57 J, 455/90, 455/321, 342/14, 342/16, 342/21
• US Class Current: 375/316
• CPC Class Codes: G01S 13/767 Responders; Transponders teaching or practice apparatus for gun-aiming or gun-laying using reflecting targets or active targets F41G3/26
• CPC Class Codes: H04B 1/0003 Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain digital baseband systems H04L25/00; digital modulation/demodulation H04L27/00; CDMA H04B1/707; TDMA H04B7/2643; image transmission H04N5/00
• CPC Class Codes: H04B 1/0014 using DSP [Digital Signal Processor] quadrature modulation and demodulation
• CPC Class Codes: H04B 1/0039 using DSP [Digital Signal Processor] quadrature modulation and demodulation
• CPC Class Codes: H04B 1/26 for superheterodyne receivers multiple frequency-changing H03D7/16
• CPC Class Codes: H04B 1/40 Circuits

Abstract

A digital submodule is included in a software programmable common receive module for receiving IF signals and producing a serial bit stream. The digital submodule is programmable based on a selected application of a plurality of radio applications and, if present, a selected function of a plurality of functions of the selected radio application. The digital submodule may include an analog to digital converter for converting IF signals received from an analog submodule into digital signals. The digital signals are supplied to a programmable signal processing unit which is configured, according to the selected radio application and, if present, the selected function, to perform control functions, processing and analysis of the digital signals and generate output signals. The output signals are then formatted by a formatting unit producing formatted digital signals. The formatted digital signals are then supplied to a system bus. The programmable signal processing unit may include a digital downconverter for selective use depending on the selected application of radio communication, for generating a base signal. Additionally, a central processing unit is included to perform further signal processing for selected radio application.

Claims

1. A programmable receive module comprising:

a self-contained analog submodule, programmably reconfigurable for receiving all RF signals within a range of approximately 1 KHz to 1870 MHz corresponding to a plurality of radio applications, for converting a received RF signal and for outputting either the received RF signal or the converted RF signal as an intermediate frequency signal; and

a self-contained digital submodule, coupled to said self-contained analog submodule, programmably reconfigurable for producing a bit stream representing information associated with a specific one of the plurality of radio applications based on the intermediate frequency signal

said self-contained digital submodule being programmable for the specific one of a plurality of radio applications and produces one of the serial bit stream and a parallel bit stream as the bit stream in accordance with the intermediate frequency signal and the specific one of the plurality of radio applications,

an analog to digital converter portion for converting the intermediate frequency signal into a digital signal based on the specific one of the plurality of radio applications;

a digital processing portion for processing the digital signal, said digital processing portion being programmable to produce output signals based on the specific one of the plurality of radio applications; and

a reconfigurable format unit for formatting the output signals into the bit stream according to the specific one of the plurality of radio applications,

said reconfigurable format unit further comprising a first field programmable gate array configured to perform a first set of preprocessing and control functions, a second field programmable gate array configured to perform demodulation processing and a first set of input/output functions, and a third field programmable gate array configured to perform a second set control and a second set of input/output functions for the specific one of the plurality of radio applications.

2. The programmable receive module as in claim 1, wherein said digital processing portion is electrically isolated from said self-contained analog submodule and from said analog-to-digital converter portion.

3. The programmable receive module as in claim 1, wherein clocks associated with a digital connection between said self-contained analog submodule and said self-contained digital submodule are turned off during signal reception.

4. The programmable receive module as in claim 1, further comprising an antenna interface unit for coupling an antenna to the programmable receive module,

clocks associated with a digital connection between the programmable receive module and said antenna interface unit in an associated channel being turned off during signal reception through said antenna interface unit.

5. The programmable receive module as in claim 1, further comprising transceivers and drivers coupled to said self-contained analog submodule and said self-contained digital submodule for providing electrical isolation and dual rail connectivity between said self-contained digital submodule and said self-contained analog submodule, and between said self-contained digital submodule and said analog-to-digital converter portion.

6. The programmable receive module as in claim 1, wherein the intermediate frequency signal input to said analog-to-digital converter portion is one of a wideband intermediate frequency signal, a narrowband intermediate frequency signal, and an RF signal.

7. The programmable receive module as in claim 1, further comprising an antenna interface unit for coupling an antenna to the programmable receive module, said self-contained digital submodule comprising:

means for producing signals to control said self-contained analog submodule and said self-contained digital submodule, and

means for producing signals for controlling said antenna interface unit.

8. The programmable receive module as in claim 1, wherein said self-contained digital submodule further comprises at least one of:

at least one system bus coupling the programmable receive module to an external controller which controls or reprograms the programmable receive module and transmits an information signal;

a control bus coupling the programmable receive module to an antenna interface unit;

a transpond bus connecting the programmable receive module to a programmable transmit module; and

an applique bus coupling the programmable receive module to an applique module.

9. The programmable receive module as in claim 1, wherein said self-contained digital submodule comprises programmable digital interfaces.

10. The programmable receive module as in claim 9, wherein said programmable digital interfaces may be at least one of serial, parallel, synchronous, asynchronous, unidirectional, bidirectional, and of standard and custom protocols.

11. The programmable receive module as in claim 1, wherein said self-contained digital submodule further comprises:

a memory for storing a plurality of application programs which respectively correspond to the plurality of radio applications,

said self-contained digital submodule executing a respective program of the plurality of application programs stored in said memory to control the programmable receive module to receive and demodulate RF signals in accordance with a specific one of the plurality of radio applications corresponding to the respective program.

12. The programmable receive module as in claim 1, wherein said self-contained analog submodule comprises a tunable local oscillator, and

said self-contained digital submodule comprises a numerically controlled oscillator,

frequency tuning being proportioned between said numerically controlled oscillator and said tunable local oscillator.

13. The programmable receive module as recited in claim 1, wherein said reconfigurable format unit comprises at least one dynamically configurable unit.

14. The programmable receive module as recited in claim 1, wherein said digital processing portion comprises at least one field programmable gate array configurable based on the specific one of the plurality of radio applications.

15. The programmable receive module as recited in claim 14, wherein said digital processing portion further comprises a digital downconverter configurable based on the specific one of the plurality of radio applications.

16. The programmable receive module as recited in claim 14, wherein said digital processing portion further comprises a digital sequential instruction processing unit programmable based on the specific one of the plurality of radio applications.

17. The programmable receive module as recited in claim 14, wherein said digital processing portion further comprises either a RAM memory or a FLASH memory.

18. The programmable receive module as recited in claim 14, wherein said digital processing portion further comprises at least one programmable digital filter unit.

19. The programmable receive module as recited in claim 1, wherein said first field programmable gate array is configured to perform pulse detection, pulse width discrimination, interval discrimination and mode decoding of the intermediate frequency signal for the specific one of a plurality of radio applications.

20. The programmable receive module as recited in claim 1, wherein said digital signal processing portion comprises a digital downconverter for digitally downconverting the digital signal to generate a baseband signal including an in-phase signal and a quadrature signal, said digital downconverter configurable depending on the specific one of the plurality of radio applications.

21. The programmable receive module as recited in claim 20, wherein said digital downconverter comprises:

a numerically controlled oscillator for supplying a cosine signal and a sine signal;

mixing means for mixing the cosine signal and the digital signal to generate a mixed cosine signal and for mixing the sine signal and the digital signal to generate a mixed sine signal;

filtering means for filtering the mixed cosine signal to produce a filtered cosine signal and for filtering the mixed sine signal to produce a filtered sine signal; and

decimating means, programmable based on the specific one of the plurality of radio applications, for decimating the filtered cosine signal and the filtered sine signal; and

tuning means for tuning the decimated signal to provide the baseband signal including the inphase signal and the quadrature signal, respectively.

22. The programmable receive module as in claim 1, the intermediate frequency signal being one of 30 MHz, 1 MHz or less than 1.5 MHz.

23. A programmable receive module comprising:

an analog submodule programmably reconfigurable for receiving and translating all RF signals of a plurality of different radio modes within a frequency range of 1 KHz to 1870 MHz into corresponding IF signals; and

a digital submodule, programmably reconfigurable for operation in the plurality of different radio modes, for digitally converting a corresponding IF signal output from said analog submodule and for digitally processing the converted IF signal into a received bit stream in the corresponding radio mode of the converted IF signal;

wherein said digital submodule is programmably reconfigurable to perform threshold detection pulse detection and interval discrimination on the converted IF signal during operation in selected radio modes of the plurality of different radio modes.

24. The programmable receive module of claim 23, wherein the plurality of different radio modes comprise communication, navigation and identification modes.

25. The programmable receive module of claim 24, wherein the identification modes comprise air traffic control radio beacon and identify friend or foe modes.

26. The programmable receive module of claim 23, wherein said digital submodule comprises at least one field programmable gate array programmably reconfigurable to perform the threshold detection, the pulse detection and the interval discrimination on the converted IF signal during operation in the selected radio modes of the plurality of different radio modes.

27. The programmable receive module of claim 24, wherein the communication modes comprise VHF, HF and UHF AM modes.

28. The programmable receive module of claim 24, wherein the navigation modes comprise localizer, marker beacon and glidescope modes.

29. The programmable receive module of claim 23, wherein said digital submodule comprises:

digital conversion means for digitally converting the corresponding IF signal output from said analog submodule to provide the converted IF signal; and

processing means for digitally processing the converted IF signal into the received bit stream,

said processing means being electrically isolated from said digital conversion means and said analog submodule.

30. The programmable receive module of claim 29, wherein communication of clock signals between said digital submodule and said analog submodule is stopped during reception of RF signals.

31. The programmable receive module of claim 29, wherein said digital submodule and said analog submodule each comprise respective line transceivers/drivers for providing electrically isolated dual rail connectivity between said digital submodule and said analog submodule.

32. The programmable receive module of claim 29, wherein said processing means generates and provides an antenna control signal to an external antenna interface unit via a control bus and generates and provides a transpond signal to an external transmit module via a transpond bus,

said digital submodule further comprising an applique bus for coupling said processing means to an external applique module and a system bus for coupling said digital submodule to an external controller which provides configuration data and information signals to said digital submodule.

33. The programmable receive module of claim 23, wherein said digital submodule comprises at least one field programmable gate array reconfigurable to perform digital processing of the converted IF signal during operation in each of the plurality of different radio modes.

34. The programmable receive module of claim 33, wherein said digital submodule comprises a memory for storing configuration data which is supplied to said at least one field programmable gate array to reconfigure said at least one field programmable gate array for operation in the plurality of different radio modes.

35. The programmable receive module of claim 23, wherein said digital submodule is programmably reconfigurable to have a plurality of digital interfaces for receiving and sending data.

36. The programmable receive module of claim 35, wherein said plurality of digital interfaces are programmably reconfigurable as serial, parallel, synchronous, asynchronous, unidirectional and bidirectional interfaces in standard and custom protocols.

37. The programmable receive module of claim 23, wherein said analog submodule includes a tunable local oscillator for translating the RF signals and said digital submodule includes a numerically controlled oscillator for digitally down converting the converted IF signal, frequency tuning being proportioned between said tunable local oscillator and said numerically controlled oscillator under control of said processing means.

38. The programmable receive module of claim 23, wherein said digital submodule is programmably reconfigurable to selectively perform amplitude, phase and frequency demodulation of the converted IF signal during operation in selected radio modes of the plurality of different radio modes.

39. The programmable receive module of claim 23, wherein the IF signal is one of 30 MHz, 1 MHz or less than 1.5 MHz.