Pulse transponder countermeasure

1. A pulse transponder countermeasure device, comprising:

a central processing unit (CPU);

an optical receiver connected with said CPU, said optical receiver adapted to receive detection signals from a speed measuring device;

at least one optical transmitter connected with said CPU, said at least one optical transmitter adapted to transmit jamming signals to said speed measuring device; and

a speed sensor unit adapted to measure a vehicle's speed,

said CPU configured to use said vehicle's speed to calculate a response time for sending a jamming signal to said speed measuring device.

2. The device of claim 1 , said CPU further configured to quantify at least one of said detected signal's dimensions and send a jamming signal that simulates a reflected signal.

3. The device of claim 2 , wherein said transmitter is configured to control at least one of said jamming signal's amplitude, width and shape.

4. The device of claim 1 , further comprising memory connected with said CPU, said memory storing a database of measuring devices signature signals.

5. The device of claim 4 , wherein said database additionally stores measuring devices reflective signals.

6. The device of claim 4 , wherein said CPU is configured to identify said speed measuring device in said database according to said received detection signal's signature.

7. The device of claim 1 , further comprising means for recording said detection signals.

8. A method of jamming a speed and/or distance detection signal, comprising:

receiving from a speed measurement device a detection signal directed at a vehicle;

measuring said vehicle's speed;

using said measured speed to calculate a response time for sending a jamming signal to said speed measuring device so as to change the speed and/or distance perceived by said speed measurement device; and

sending a signal toward said speed measurement device at said calculated time.

9. A method of jamming a speed and/or distance detection signal, comprising:

receiving from a speed measurement device a detection signal directed at a vehicle, said detection signal having a signature and a reflected signal pattern;

analyzing said signature to identify said speed measurement device in a database comprising speed measurement devices signatures;

calculating a jamming signal;

measuring said vehicle's speed;

using said measured speed to calculate a response time for sending said jamming signal; and

transmitting said jamming signal to said speed measurement device at said calculated time.

10. The method of claim 9 , wherein said analyzing comprises using a statistical probability algorithm to find a closest match to said signature in said database.

11. The method of claim 10 , wherein if the difference between said closest match and said signature is greater than a predefined threshold, a new entry is created in said database for said signature.

12. The method of claim 9 , wherein said transmitting a jamming signal comprises controlling at least one of said jamming signal's amplitude, phase and shape using software control.

13. The method of claim 9 , wherein said transmitting a jamming signal comprises changing the speed and/or distance perceived by said measurement device.

14. The method of claim 9 , wherein said detection signals comprise a predefined sequence of signals transmitted in a cyclic pattern and wherein said database comprises a complete list of signatures for said cyclic pattern.

15. The method of claim 9 , wherein said steps of receiving, analyzing, calculating and transmitting are done simultaneously for at least two speed measurement devices.

16. The method of claim 9 , wherein said transmitting comprises:

transmitting at least one signal having one dimension similar to said reflected signal and slightly different remaining dimensions; and

transmitting a jamming signal wherein said one dimension is slightly different from said one dimension in said reflected signal.

17. The method of claim 16 , wherein said one dimension is selected from the group consisting of: signal amplitude, signal width, signal PRP and signal shape.

18. The method of claim 9 , additionally comprising adding a database entry for said speed measurement device, comprising said received signal's signature, if said signature is not found in said database.

19. A pulse transponder measuring device, comprising:

a central processing unit (CPU);

an optical transmitter connected with said CPU, said optical transmitter adapted to transmit detection signals to a measured vehicle; and

an optical receiver connected with said CPU, said optical receiver adapted to receive reflected signals from said measured vehicle;

said transmitter configured to control at least one of said transmitted signal's dimensions.

20. A pulse transponder measuring device, comprising:

a central processing unit (CPU);

an optical transmitter connected with said CPU, said optical transmitter adapted to transmit detection signals to a measured vehicle; and

an optical receiver connected with said CPU, said optical receiver adapted to receive reflected signals from said measured vehicle;

said CPU configured to detect at least one of said reflected signal's pulse repetition period (PRP), amplitude, width and shape.

21. A method of measuring a vehicle's speed, comprising:

generating at least one first random number;

calculating a first detection signal by assigning said at least one first random number to at least one dimension of said calculated first detection signal;

transmitting said calculated first detection signal towards a vehicle.