High probability of intercept radar detector

A method of detecting continuous wave police radar comprising:

• receiving an input signal from a first antenna, the input signal comprising a continuous wave emission within a frequency spectrum spanning approximately 3 GHz between a first input frequency to a second input frequency;
• sweeping a local oscillator signal through a range of frequencies from a first local oscillator frequency to a second local oscillator frequency in a predetermined time period;
• mixing the input signal from the first antenna with the local oscillator signal to produce an output signal having an intermediate frequency;
• wherein
• a) the first local oscillator frequency is selected such that when mixed with the first input frequency, the output signal at the intermediate frequency is produced, and
• b) the second local oscillator frequency is selected such that when mixed with the second input frequency, the output signal at the intermediate frequency is produced;
• and
• repeating sweeping of the local oscillator signal through the range of frequencies such that the local oscillator signal is swept through the range of frequencies a plurality of times within at most 16 ms;
• and
• determining, by a processor executing a signal analysis routine, that the input signal from the first antenna includes a police radar signal based at least in part on:
• a detected instance of an amplitude the output signal exceeding a predetermined threshold;
• and
• an amount of time that has elapsed between a start of one sweeping of the composite local oscillator and the detected instance.

A detector for detecting continuous wave police radar comprising:

• a first antenna configured to receive an input signal, the input signal comprising a continuous wave emission within at least one radar band;
• a composite local oscillator configured to sweep a signal through a range of frequencies from a first frequency to a second frequency in a predetermined time period to produce a composite local oscillator signal having a first chirp rate with a first chirp rate magnitude of at least 0.15 MHz/μs;
• a mixer configured to mix the input signal from the first antenna with the sweeping composite local oscillator signal to produce an output signal having an intermediate frequency;
• and
• a signal analyzer configured to determine whether the input signal from the first antenna includes a police radar signal based at least in part on:
• a detected instance of an amplitude of the output signal exceeding a predetermined threshold;
• and
• an amount of time that has elapsed between a start of the sweeping of the composite local oscillator and the detected instance.

A detector for detecting continuous wave police radar, comprising:

• a first antenna configured to receive an input signal, the input signal comprising a continuous wave emission within a frequency spectrum spanning approximately 3 GHz between a first input frequency to a second input frequency;
• an oscillator configured to sweep a signal through a range of frequencies from a first local oscillator frequency to a second local oscillator frequency in a predetermined time period to produce a local oscillator signal;
• a mixer configured to mix the input signal from the first antenna with the local oscillator signal to produce an output signal having an intermediate frequency;
• wherein
• a) the first local oscillator frequency is selected such that when mixed with the first input frequency, the output signal at the intermediate frequency is produced, and
• b) the second local oscillator frequency is selected such that when mixed with the second input frequency, the output signal at the intermediate frequency is produced;
• and
• the oscillator further configured to repeat sweeping of the signal through the range of frequencies such that the local oscillator signal is swept through the range of frequencies a plurality of times within at most 16 ms;
• and
• a signal analyzer configured to determine whether the input signal from the first antenna includes a police radar signal based at least in part on:
• a detected instance of an amplitude the output signal exceeding a predetermined threshold;
• and
• an amount of time that has elapsed between a start of one sweeping of the composite local oscillator and the detected instance.