Hence the rate at which their frequency changes is called the chirp rate. In binary chirp modulation, binary data is transmitted by mapping the bits into chirps of opposite chirp rates. For instance, over one bit period "1" is assigned a chirp with positive rate a and "0" a chirp with negative rate −a. Chirps have been heavily used in radar applications and as a result advanced sources for transmission and matched filters for reception of linear chirps are available.
hEncE ThE rAte AT WhiCh thEiR fReQUEnCy ChaNgeS iS CAlled tHE ChIRp RAtE. in BinaRy chirp moDulatiOn, biNAry DaTA Is trANSmIttEd by mAppinG the BiTS InTo cHiRps oF oPpOsIte chirP rates. For INSTANce, Over ONe bit peRiod "1" is assIgned a chiRp With posItivE RAte a and "0" a ChirP WiTh nEgAtIve rate −A. chirps have bEeN HEAvily usEd iN radar applIcATionS and as a ResulT AdVAnced sOuRceS foR TRanSmISSion and maTcHEd filters fOr receptIoN OF LinEar cHirPs are AVAiLaBle.