Engines in system simultaneously receiving GPS and GLONASS signals

1. A method of operating a receiver configured to receive global positioning system (GPS) signals and global navigation satellite system (GLONASS) signals, the method comprising:

utilizing a first search engine in the receiver to search for a first coarse acquisition (CA) code phase and a first Doppler frequency corresponding to a GPS signal, the first CA code phase and the first Doppler frequency used to acquire the GPS signal; and

utilizing the first search engine to search for a second CA code phase and a second Doppler frequency that corresponds to a GLONASS signal, the second CA code phase and the second Doppler frequency used to acquire the GLONASS signal.

2. The method of claim 1 , wherein the first search engine performs both coherent integration and non-coherent integration.

3. The method of claim 2 , wherein the first search engine provides maximum output values to a software module for acquisition of a satellite signal.

4. The method of claim 1 , further comprising:

tracking acquired GPS and GLONASS signals using the first search engine.

5. The method of claim 1 , further comprising:

tracking acquired GPS and GLONASS signals using a tracking engine.

6. The method of claim 1 , further comprising:

receiving, at the first search engine, an incoming signal;

mixing the incoming signal with a coarse carrier frequency;

correlating the incoming signal with a respective code sequence;

mixing the correlated incoming signal with a fine carrier frequency; and

performing coherent and non-coherent integration to determine a maximum correlation output value.

7. A device for receiving global positioning system (GPS) signals and global navigation satellite system (GLONASS) signals, the device comprising:

a first search engine to search for a first coarse acquisition (CA) code phase and a first Doppler frequency corresponding to a GPS signal and a second CA code phase and a second Doppler frequency that corresponds to a GLONASS signal, the first CA code phase and the first Doppler frequency used to acquire the GPS signal, the second CA code phase and the second Doppler frequency used to acquire the GLONASS signal.

8. The device of claim 7 , the first search engine further comprising:

a first mixer to mix an incoming signal with the coarse carrier frequency;

a code generator to generate a GPS or GLONASS code sequence;

a correlator block to correlate the incoming signal with the coarse carrier frequency;

a second mixer to mix the correlated incoming signal with a fine carrier frequency; and

a coherent integration block to perform coherent integration on mixed correlated incoming signals which are received within a period of time.

9. The device of claim 8 , the first search engine further comprising:

a non-coherent integration block to perform non-coherent integration for a predetermined number of times on outputs of the coherent integration block; and

a max block to determine a maximum correlation value.

10. The device of claim 7 , further comprising:

a dual mode interface (DMI) that generates I and Q components of an incoming signal; and

wherein the first search engine receives the I and Q components of the incoming signal.

11. The device of claim 10 , further comprising:

an analog front end (AFE) configured to receive a GPS signal and a GLONASS signal and to generate a first analog-to-digital converted (ADC) output and a second ADC output;

a digital front end (DFE) including a GPS path and a GLONASS path, the GPS path receiving the first ADC output and generating a GPS-specific output, the GLONASS path receiving the second ADC output and generating a GLONASS-specific output; and

a multiplexer block for receiving the GPS-specific output and the GLONASS-specific output and generating a multiplexed signal.

12. The device of claim 11 , further comprising:

a first integrated circuit having the AFE, the DFE, and the multiplexor block; and

a second integrated circuit having the DMI, the first search engine, and a tracking engine, the tracking engine for tracking an acquired GPS signal and an acquired GLONASS signal;

wherein the first integrated circuit and the second integrated circuit are different.