Multi-frequency GNSS receiver baseband DSP

1. A multi-frequency, cross-wiping global navigation satellite system (GNSS) receiver system, which comprises:

first and second GNSS RF antennas with respective first and second frequencies;

an analog downconverter connected to said first and second antennas and adapted for down converting analog signals therefrom;

said analog downconverter having sin and cosine functions for modifying said signals from said antennas and providing digital truth terms having in-phase (I) and in-quadrature (Q) components respectively;

a digital downconverter adapted for receiving said analog down converter output and providing I and Q digital signal outputs for said down converted first and second frequencies respectively;

a correlator including:

first and second inputs each including I and Q signal component inputs adapted for receiving the I and Q components of said first and second signals respectively;

an I adder connected to said first and second I component inputs and providing a combined I component output;

a Q adder connected to said first and second Q component inputs and providing a combined Q component output;

a first mixer connected to said I adder output and said second Q component input and adapted for mixing said signal components and providing a first frequency correlator output; and

a second mixer connected to said Q adder output and said first I component input and adapted for mixing said signal components and providing a second frequency correlator output; and

a GNSS solution processor connected to and receiving said first and second frequency cross-wiped single outputs from said correlator and providing GNSS location solutions there from.

2. An analog correlator for cross-wiping first and second digital signals with respective first and second frequencies and in-phase (I) and in-quadrature (Q) signal components, which correlator includes:

first and second inputs each including I and Q signal component inputs adapted for receiving the I and Q components of said first and second signals respectively;

an I adder connected to said first and second I component inputs and providing a combined I component output;

a Q adder connected to said first and second Q component inputs and providing a combined Q component output;

a first mixer connected to said I adder output and said second Q component input and adapted for mixing said signal components and providing a first frequency correlator output; and

a second mixer connected to said Q adder output and said first I component input and adapted for mixing said signal components and providing a second frequency correlator output.

3. A digital correlator for cross-wiping first and second digital signals with respective first and second frequencies, which correlator includes:

first and second inputs adapted for receiving said first and second digital signals respectively;

1st and 2 nd in-phase (I) mixers connected to said 1 st and 2 nd inputs respectively;

1st and 2 nd in-quadrature (Q) mixers connected to said 1 st and 2 nd inputs respectively;

an I adder connected to said first and second I mixers and providing a combined I component output;

a Q adder connected to said first and second Q mixers and providing a combined Q component output;

a first IQ mixer connected to said I adder output and said second Q mixer output and adapted for mixing said signal components and providing a first frequency correlator output; and

a second IQ mixer connected to said Q adder output and said first I mixer output and adapted for mixing said signal components and providing a second frequency correlator output.

4. The correlator according to claim 3 wherein said correlator signals comprise an intermediate frequency.